aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-06 16:57:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-06 16:57:52 -0700
commitdd4e5d6106b2380e2c1238406d26df8b2fe1c42c (patch)
tree33eb172237dd8873de02d5b881bf17cf58d05fab
parent14be4c61c205dcb0a72251c1e2790814181bd9ba (diff)
parent9726840d9cf0d42377e1591263d7c1d9ae0988ac (diff)
downloadlinux-dd4e5d6106b2380e2c1238406d26df8b2fe1c42c.tar.gz
Merge tag 'arm64-mmiowb' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull mmiowb removal from Will Deacon: "Remove Mysterious Macro Intended to Obscure Weird Behaviours (mmiowb()) Remove mmiowb() from the kernel memory barrier API and instead, for architectures that need it, hide the barrier inside spin_unlock() when MMIO has been performed inside the critical section. The only relatively recent changes have been addressing review comments on the documentation, which is in a much better shape thanks to the efforts of Ben and Ingo. I was initially planning to split this into two pull requests so that you could run the coccinelle script yourself, however it's been plain sailing in linux-next so I've just included the whole lot here to keep things simple" * tag 'arm64-mmiowb' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (23 commits) docs/memory-barriers.txt: Update I/O section to be clearer about CPU vs thread docs/memory-barriers.txt: Fix style, spacing and grammar in I/O section arch: Remove dummy mmiowb() definitions from arch code net/ethernet/silan/sc92031: Remove stale comment about mmiowb() i40iw: Redefine i40iw_mmiowb() to do nothing scsi/qla1280: Remove stale comment about mmiowb() drivers: Remove explicit invocations of mmiowb() drivers: Remove useless trailing comments from mmiowb() invocations Documentation: Kill all references to mmiowb() riscv/mmiowb: Hook up mmwiob() implementation to asm-generic code powerpc/mmiowb: Hook up mmwiob() implementation to asm-generic code ia64/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() sh/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() m68k/io: Remove useless definition of mmiowb() nds32/io: Remove useless definition of mmiowb() x86/io: Remove useless definition of mmiowb() arm64/io: Remove useless definition of mmiowb() ARM/io: Remove useless definition of mmiowb() mmiowb: Hook up mmiowb helpers to spinlocks and generic I/O accessors ...
-rw-r--r--Documentation/driver-api/device-io.rst45
-rw-r--r--Documentation/driver-api/pci/p2pdma.rst4
-rw-r--r--Documentation/memory-barriers.txt249
-rw-r--r--arch/alpha/include/asm/Kbuild1
-rw-r--r--arch/alpha/include/asm/io.h2
-rw-r--r--arch/arc/include/asm/Kbuild1
-rw-r--r--arch/arm/include/asm/Kbuild1
-rw-r--r--arch/arm/include/asm/io.h2
-rw-r--r--arch/arm64/include/asm/Kbuild1
-rw-r--r--arch/arm64/include/asm/io.h2
-rw-r--r--arch/c6x/include/asm/Kbuild1
-rw-r--r--arch/csky/include/asm/Kbuild1
-rw-r--r--arch/h8300/include/asm/Kbuild1
-rw-r--r--arch/hexagon/include/asm/Kbuild1
-rw-r--r--arch/hexagon/include/asm/io.h2
-rw-r--r--arch/ia64/include/asm/io.h17
-rw-r--r--arch/ia64/include/asm/mmiowb.h25
-rw-r--r--arch/ia64/include/asm/spinlock.h2
-rw-r--r--arch/m68k/include/asm/Kbuild1
-rw-r--r--arch/m68k/include/asm/io_mm.h2
-rw-r--r--arch/microblaze/include/asm/Kbuild1
-rw-r--r--arch/mips/include/asm/io.h3
-rw-r--r--arch/mips/include/asm/mmiowb.h11
-rw-r--r--arch/mips/include/asm/spinlock.h15
-rw-r--r--arch/nds32/include/asm/Kbuild1
-rw-r--r--arch/nds32/include/asm/io.h2
-rw-r--r--arch/nios2/include/asm/Kbuild1
-rw-r--r--arch/openrisc/include/asm/Kbuild1
-rw-r--r--arch/parisc/include/asm/Kbuild1
-rw-r--r--arch/parisc/include/asm/io.h2
-rw-r--r--arch/powerpc/Kconfig1
-rw-r--r--arch/powerpc/include/asm/io.h33
-rw-r--r--arch/powerpc/include/asm/mmiowb.h18
-rw-r--r--arch/powerpc/include/asm/paca.h6
-rw-r--r--arch/powerpc/include/asm/spinlock.h17
-rw-r--r--arch/powerpc/xmon/xmon.c5
-rw-r--r--arch/riscv/Kconfig1
-rw-r--r--arch/riscv/include/asm/io.h15
-rw-r--r--arch/riscv/include/asm/mmiowb.h14
-rw-r--r--arch/s390/include/asm/Kbuild1
-rw-r--r--arch/sh/include/asm/io.h3
-rw-r--r--arch/sh/include/asm/mmiowb.h12
-rw-r--r--arch/sh/include/asm/spinlock-llsc.h2
-rw-r--r--arch/sparc/include/asm/Kbuild1
-rw-r--r--arch/sparc/include/asm/io_64.h2
-rw-r--r--arch/um/include/asm/Kbuild1
-rw-r--r--arch/unicore32/include/asm/Kbuild1
-rw-r--r--arch/x86/include/asm/Kbuild1
-rw-r--r--arch/x86/include/asm/io.h2
-rw-r--r--arch/xtensa/include/asm/Kbuild1
-rw-r--r--drivers/crypto/cavium/nitrox/nitrox_reqmgr.c4
-rw-r--r--drivers/dma/txx9dmac.c3
-rw-r--r--drivers/firewire/ohci.c1
-rw-r--r--drivers/gpu/drm/i915/intel_hdmi.c10
-rw-r--r--drivers/ide/tx4939ide.c2
-rw-r--r--drivers/infiniband/hw/hfi1/chip.c3
-rw-r--r--drivers/infiniband/hw/hfi1/pio.c1
-rw-r--r--drivers/infiniband/hw/hns/hns_roce_hw_v1.c2
-rw-r--r--drivers/infiniband/hw/i40iw/i40iw_osdep.h2
-rw-r--r--drivers/infiniband/hw/mlx4/qp.c6
-rw-r--r--drivers/infiniband/hw/mlx5/qp.c1
-rw-r--r--drivers/infiniband/hw/mthca/mthca_cmd.c6
-rw-r--r--drivers/infiniband/hw/mthca/mthca_cq.c5
-rw-r--r--drivers/infiniband/hw/mthca/mthca_qp.c17
-rw-r--r--drivers/infiniband/hw/mthca/mthca_srq.c6
-rw-r--r--drivers/infiniband/hw/qedr/verbs.c12
-rw-r--r--drivers/infiniband/hw/qib/qib_iba6120.c4
-rw-r--r--drivers/infiniband/hw/qib/qib_iba7220.c3
-rw-r--r--drivers/infiniband/hw/qib/qib_iba7322.c3
-rw-r--r--drivers/infiniband/hw/qib/qib_sd7220.c4
-rw-r--r--drivers/media/pci/dt3155/dt3155.c8
-rw-r--r--drivers/memstick/host/jmb38x_ms.c4
-rw-r--r--drivers/misc/ioc4.c2
-rw-r--r--drivers/misc/mei/hw-me.c3
-rw-r--r--drivers/misc/tifm_7xx1.c1
-rw-r--r--drivers/mmc/host/alcor.c1
-rw-r--r--drivers/mmc/host/sdhci.c13
-rw-r--r--drivers/mmc/host/tifm_sd.c3
-rw-r--r--drivers/mmc/host/via-sdmmc.c10
-rw-r--r--drivers/mtd/nand/raw/r852.c2
-rw-r--r--drivers/mtd/nand/raw/txx9ndfmc.c1
-rw-r--r--drivers/net/ethernet/aeroflex/greth.c1
-rw-r--r--drivers/net/ethernet/alacritech/slicoss.c4
-rw-r--r--drivers/net/ethernet/amazon/ena/ena_com.c1
-rw-r--r--drivers/net/ethernet/atheros/atlx/atl1.c1
-rw-r--r--drivers/net/ethernet/atheros/atlx/atl2.c1
-rw-r--r--drivers/net/ethernet/broadcom/bnx2.c4
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c2
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h4
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c1
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c29
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c1
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c2
-rw-r--r--drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c4
-rw-r--r--drivers/net/ethernet/broadcom/bnxt/bnxt.c3
-rw-r--r--drivers/net/ethernet/broadcom/tg3.c6
-rw-r--r--drivers/net/ethernet/cavium/liquidio/cn66xx_device.c10
-rw-r--r--drivers/net/ethernet/cavium/liquidio/octeon_device.c1
-rw-r--r--drivers/net/ethernet/cavium/liquidio/octeon_droq.c4
-rw-r--r--drivers/net/ethernet/cavium/liquidio/request_manager.c1
-rw-r--r--drivers/net/ethernet/intel/e1000/e1000_main.c5
-rw-r--r--drivers/net/ethernet/intel/e1000e/netdev.c7
-rw-r--r--drivers/net/ethernet/intel/fm10k/fm10k_iov.c2
-rw-r--r--drivers/net/ethernet/intel/fm10k/fm10k_main.c5
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_txrx.c5
-rw-r--r--drivers/net/ethernet/intel/iavf/iavf_txrx.c5
-rw-r--r--drivers/net/ethernet/intel/ice/ice_txrx.c5
-rw-r--r--drivers/net/ethernet/intel/igb/igb_main.c5
-rw-r--r--drivers/net/ethernet/intel/igbvf/netdev.c4
-rw-r--r--drivers/net/ethernet/intel/igc/igc_main.c5
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe_main.c5
-rw-r--r--drivers/net/ethernet/marvell/sky2.c4
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/catas.c4
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/cmd.c13
-rw-r--r--drivers/net/ethernet/mellanox/mlx5/core/cmd.c1
-rw-r--r--drivers/net/ethernet/myricom/myri10ge/myri10ge.c2
-rw-r--r--drivers/net/ethernet/neterion/s2io.c2
-rw-r--r--drivers/net/ethernet/neterion/vxge/vxge-main.c5
-rw-r--r--drivers/net/ethernet/neterion/vxge/vxge-traffic.c4
-rw-r--r--drivers/net/ethernet/qlogic/qed/qed_int.c13
-rw-r--r--drivers/net/ethernet/qlogic/qed/qed_spq.c3
-rw-r--r--drivers/net/ethernet/qlogic/qede/qede_ethtool.c8
-rw-r--r--drivers/net/ethernet/qlogic/qede/qede_fp.c8
-rw-r--r--drivers/net/ethernet/qlogic/qla3xxx.c1
-rw-r--r--drivers/net/ethernet/qlogic/qlge/qlge.h1
-rw-r--r--drivers/net/ethernet/qlogic/qlge/qlge_main.c1
-rw-r--r--drivers/net/ethernet/renesas/ravb_main.c9
-rw-r--r--drivers/net/ethernet/renesas/ravb_ptp.c3
-rw-r--r--drivers/net/ethernet/renesas/sh_eth.c1
-rw-r--r--drivers/net/ethernet/sfc/falcon/io.h2
-rw-r--r--drivers/net/ethernet/sfc/io.h2
-rw-r--r--drivers/net/ethernet/silan/sc92031.c15
-rw-r--r--drivers/net/ethernet/via/via-rhine.c3
-rw-r--r--drivers/net/ethernet/wiznet/w5100.c6
-rw-r--r--drivers/net/ethernet/wiznet/w5300.c15
-rw-r--r--drivers/net/wireless/ath/ath5k/base.c4
-rw-r--r--drivers/net/wireless/ath/ath5k/mac80211-ops.c2
-rw-r--r--drivers/net/wireless/broadcom/b43/main.c7
-rw-r--r--drivers/net/wireless/broadcom/b43/sysfs.c1
-rw-r--r--drivers/net/wireless/broadcom/b43legacy/ilt.c2
-rw-r--r--drivers/net/wireless/broadcom/b43legacy/main.c20
-rw-r--r--drivers/net/wireless/broadcom/b43legacy/phy.c1
-rw-r--r--drivers/net/wireless/broadcom/b43legacy/pio.h1
-rw-r--r--drivers/net/wireless/broadcom/b43legacy/radio.c4
-rw-r--r--drivers/net/wireless/broadcom/b43legacy/sysfs.c1
-rw-r--r--drivers/net/wireless/intel/iwlegacy/common.h7
-rw-r--r--drivers/net/wireless/intel/iwlwifi/pcie/trans.c1
-rw-r--r--drivers/ntb/hw/idt/ntb_hw_idt.c7
-rw-r--r--drivers/ntb/test/ntb_perf.c3
-rw-r--r--drivers/scsi/bfa/bfa.h3
-rw-r--r--drivers/scsi/bfa/bfa_hw_cb.c2
-rw-r--r--drivers/scsi/bfa/bfa_hw_ct.c2
-rw-r--r--drivers/scsi/bnx2fc/bnx2fc_hwi.c2
-rw-r--r--drivers/scsi/bnx2i/bnx2i_hwi.c3
-rw-r--r--drivers/scsi/megaraid/megaraid_sas_base.c1
-rw-r--r--drivers/scsi/megaraid/megaraid_sas_fusion.c1
-rw-r--r--drivers/scsi/mpt3sas/mpt3sas_base.c1
-rw-r--r--drivers/scsi/qedf/qedf_io.c1
-rw-r--r--drivers/scsi/qedi/qedi_fw.c1
-rw-r--r--drivers/scsi/qla1280.c15
-rw-r--r--drivers/ssb/pci.c1
-rw-r--r--drivers/ssb/pcmcia.c4
-rw-r--r--drivers/staging/comedi/drivers/mite.c3
-rw-r--r--drivers/staging/comedi/drivers/ni_660x.c2
-rw-r--r--drivers/staging/comedi/drivers/ni_mio_common.c1
-rw-r--r--drivers/staging/comedi/drivers/ni_pcidio.c2
-rw-r--r--drivers/staging/comedi/drivers/ni_tio.c1
-rw-r--r--drivers/staging/comedi/drivers/s626.c2
-rw-r--r--drivers/tty/serial/men_z135_uart.c1
-rw-r--r--drivers/tty/serial/serial_txx9.c1
-rw-r--r--drivers/usb/early/xhci-dbc.c4
-rw-r--r--drivers/usb/host/xhci-dbgcap.c2
-rw-r--r--include/asm-generic/io.h7
-rw-r--r--include/asm-generic/mmiowb.h63
-rw-r--r--include/asm-generic/mmiowb_types.h12
-rw-r--r--include/linux/qed/qed_if.h2
-rw-r--r--include/linux/spinlock.h11
-rw-r--r--kernel/Kconfig.locks7
-rw-r--r--kernel/locking/spinlock.c7
-rw-r--r--kernel/locking/spinlock_debug.c6
-rw-r--r--sound/soc/txx9/txx9aclc-ac97.c1
181 files changed, 343 insertions, 828 deletions
diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst
index b00b23903078..0e389378f71d 100644
--- a/Documentation/driver-api/device-io.rst
+++ b/Documentation/driver-api/device-io.rst
@@ -103,51 +103,6 @@ continuing execution::
ha->flags.ints_enabled = 0;
}
-In addition to write posting, on some large multiprocessing systems
-(e.g. SGI Challenge, Origin and Altix machines) posted writes won't be
-strongly ordered coming from different CPUs. Thus it's important to
-properly protect parts of your driver that do memory-mapped writes with
-locks and use the :c:func:`mmiowb()` to make sure they arrive in the
-order intended. Issuing a regular readX() will also ensure write ordering,
-but should only be used when the
-driver has to be sure that the write has actually arrived at the device
-(not that it's simply ordered with respect to other writes), since a
-full readX() is a relatively expensive operation.
-
-Generally, one should use :c:func:`mmiowb()` prior to releasing a spinlock
-that protects regions using :c:func:`writeb()` or similar functions that
-aren't surrounded by readb() calls, which will ensure ordering
-and flushing. The following pseudocode illustrates what might occur if
-write ordering isn't guaranteed via :c:func:`mmiowb()` or one of the
-readX() functions::
-
- CPU A: spin_lock_irqsave(&dev_lock, flags)
- CPU A: ...
- CPU A: writel(newval, ring_ptr);
- CPU A: spin_unlock_irqrestore(&dev_lock, flags)
- ...
- CPU B: spin_lock_irqsave(&dev_lock, flags)
- CPU B: writel(newval2, ring_ptr);
- CPU B: ...
- CPU B: spin_unlock_irqrestore(&dev_lock, flags)
-
-In the case above, newval2 could be written to ring_ptr before newval.
-Fixing it is easy though::
-
- CPU A: spin_lock_irqsave(&dev_lock, flags)
- CPU A: ...
- CPU A: writel(newval, ring_ptr);
- CPU A: mmiowb(); /* ensure no other writes beat us to the device */
- CPU A: spin_unlock_irqrestore(&dev_lock, flags)
- ...
- CPU B: spin_lock_irqsave(&dev_lock, flags)
- CPU B: writel(newval2, ring_ptr);
- CPU B: ...
- CPU B: mmiowb();
- CPU B: spin_unlock_irqrestore(&dev_lock, flags)
-
-See tg3.c for a real world example of how to use :c:func:`mmiowb()`
-
PCI ordering rules also guarantee that PIO read responses arrive after any
outstanding DMA writes from that bus, since for some devices the result of
a readb() call may signal to the driver that a DMA transaction is
diff --git a/Documentation/driver-api/pci/p2pdma.rst b/Documentation/driver-api/pci/p2pdma.rst
index 6d85b5a2598d..44deb52beeb4 100644
--- a/Documentation/driver-api/pci/p2pdma.rst
+++ b/Documentation/driver-api/pci/p2pdma.rst
@@ -132,10 +132,6 @@ precludes passing these pages to userspace.
P2P memory is also technically IO memory but should never have any side
effects behind it. Thus, the order of loads and stores should not be important
and ioreadX(), iowriteX() and friends should not be necessary.
-However, as the memory is not cache coherent, if access ever needs to
-be protected by a spinlock then :c:func:`mmiowb()` must be used before
-unlocking the lock. (See ACQUIRES VS I/O ACCESSES in
-Documentation/memory-barriers.txt)
P2P DMA Support Library
diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index 1c22b21ae922..f70ebcdfe592 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -1937,21 +1937,6 @@ There are some more advanced barrier functions:
information on consistent memory.
-MMIO WRITE BARRIER
-------------------
-
-The Linux kernel also has a special barrier for use with memory-mapped I/O
-writes:
-
- mmiowb();
-
-This is a variation on the mandatory write barrier that causes writes to weakly
-ordered I/O regions to be partially ordered. Its effects may go beyond the
-CPU->Hardware interface and actually affect the hardware at some level.
-
-See the subsection "Acquires vs I/O accesses" for more information.
-
-
===============================
IMPLICIT KERNEL MEMORY BARRIERS
===============================
@@ -2317,75 +2302,6 @@ But it won't see any of:
*E, *F or *G following RELEASE Q
-
-ACQUIRES VS I/O ACCESSES
-------------------------
-
-Under certain circumstances (especially involving NUMA), I/O accesses within
-two spinlocked sections on two different CPUs may be seen as interleaved by the
-PCI bridge, because the PCI bridge does not necessarily participate in the
-cache-coherence protocol, and is therefore incapable of issuing the required
-read memory barriers.
-
-For example:
-
- CPU 1 CPU 2
- =============================== ===============================
- spin_lock(Q)
- writel(0, ADDR)
- writel(1, DATA);
- spin_unlock(Q);
- spin_lock(Q);
- writel(4, ADDR);
- writel(5, DATA);
- spin_unlock(Q);
-
-may be seen by the PCI bridge as follows:
-
- STORE *ADDR = 0, STORE *ADDR = 4, STORE *DATA = 1, STORE *DATA = 5
-
-which would probably cause the hardware to malfunction.
-
-
-What is necessary here is to intervene with an mmiowb() before dropping the
-spinlock, for example:
-
- CPU 1 CPU 2
- =============================== ===============================
- spin_lock(Q)
- writel(0, ADDR)
- writel(1, DATA);
- mmiowb();
- spin_unlock(Q);
- spin_lock(Q);
- writel(4, ADDR);
- writel(5, DATA);
- mmiowb();
- spin_unlock(Q);
-
-this will ensure that the two stores issued on CPU 1 appear at the PCI bridge
-before either of the stores issued on CPU 2.
-
-
-Furthermore, following a store by a load from the same device obviates the need
-for the mmiowb(), because the load forces the store to complete before the load
-is performed:
-
- CPU 1 CPU 2
- =============================== ===============================
- spin_lock(Q)
- writel(0, ADDR)
- a = readl(DATA);
- spin_unlock(Q);
- spin_lock(Q);
- writel(4, ADDR);
- b = readl(DATA);
- spin_unlock(Q);
-
-
-See Documentation/driver-api/device-io.rst for more information.
-
-
=================================
WHERE ARE MEMORY BARRIERS NEEDED?
=================================
@@ -2532,16 +2448,9 @@ the device to malfunction.
Inside of the Linux kernel, I/O should be done through the appropriate accessor
routines - such as inb() or writel() - which know how to make such accesses
appropriately sequential. While this, for the most part, renders the explicit
-use of memory barriers unnecessary, there are a couple of situations where they
-might be needed:
-
- (1) On some systems, I/O stores are not strongly ordered across all CPUs, and
- so for _all_ general drivers locks should be used and mmiowb() must be
- issued prior to unlocking the critical section.
-
- (2) If the accessor functions are used to refer to an I/O memory window with
- relaxed memory access properties, then _mandatory_ memory barriers are
- required to enforce ordering.
+use of memory barriers unnecessary, if the accessor functions are used to refer
+to an I/O memory window with relaxed memory access properties, then _mandatory_
+memory barriers are required to enforce ordering.
See Documentation/driver-api/device-io.rst for more information.
@@ -2586,8 +2495,7 @@ explicit barriers are used.
Normally this won't be a problem because the I/O accesses done inside such
sections will include synchronous load operations on strictly ordered I/O
-registers that form implicit I/O barriers. If this isn't sufficient then an
-mmiowb() may need to be used explicitly.
+registers that form implicit I/O barriers.
A similar situation may occur between an interrupt routine and two routines
@@ -2599,71 +2507,114 @@ likely, then interrupt-disabling locks should be used to guarantee ordering.
KERNEL I/O BARRIER EFFECTS
==========================
-When accessing I/O memory, drivers should use the appropriate accessor
-functions:
-
- (*) inX(), outX():
-
- These are intended to talk to I/O space rather than memory space, but
- that's primarily a CPU-specific concept. The i386 and x86_64 processors
- do indeed have special I/O space access cycles and instructions, but many
- CPUs don't have such a concept.
-
- The PCI bus, amongst others, defines an I/O space concept which - on such
- CPUs as i386 and x86_64 - readily maps to the CPU's concept of I/O
- space. However, it may also be mapped as a virtual I/O space in the CPU's
- memory map, particularly on those CPUs that don't support alternate I/O
- spaces.
-
- Accesses to this space may be fully synchronous (as on i386), but
- intermediary bridges (such as the PCI host bridge) may not fully honour
- that.
-
- They are guaranteed to be fully ordered with respect to each other.
-
- They are not guaranteed to be fully ordered with respect to other types of
- memory and I/O operation.
+Interfacing with peripherals via I/O accesses is deeply architecture and device
+specific. Therefore, drivers which are inherently non-portable may rely on
+specific behaviours of their target systems in order to achieve synchronization
+in the most lightweight manner possible. For drivers intending to be portable
+between multiple architectures and bus implementations, the kernel offers a
+series of accessor functions that provide various degrees of ordering
+guarantees:
(*) readX(), writeX():
- Whether these are guaranteed to be fully ordered and uncombined with
- respect to each other on the issuing CPU depends on the characteristics
- defined for the memory window through which they're accessing. On later
- i386 architecture machines, for example, this is controlled by way of the
- MTRR registers.
+ The readX() and writeX() MMIO accessors take a pointer to the
+ peripheral being accessed as an __iomem * parameter. For pointers
+ mapped with the default I/O attributes (e.g. those returned by
+ ioremap()), the ordering guarantees are as follows:
+
+ 1. All readX() and writeX() accesses to the same peripheral are ordered
+ with respect to each other. This ensures that MMIO register accesses
+ by the same CPU thread to a particular device will arrive in program
+ order.
+
+ 2. A writeX() issued by a CPU thread holding a spinlock is ordered
+ before a writeX() to the same peripheral from another CPU thread
+ issued after a later acquisition of the same spinlock. This ensures
+ that MMIO register writes to a particular device issued while holding
+ a spinlock will arrive in an order consistent with acquisitions of
+ the lock.
+
+ 3. A writeX() by a CPU thread to the peripheral will first wait for the
+ completion of all prior writes to memory either issued by, or
+ propagated to, the same thread. This ensures that writes by the CPU
+ to an outbound DMA buffer allocated by dma_alloc_coherent() will be
+ visible to a DMA engine when the CPU writes to its MMIO control
+ register to trigger the transfer.
+
+ 4. A readX() by a CPU thread from the peripheral will complete before
+ any subsequent reads from memory by the same thread can begin. This
+ ensures that reads by the CPU from an incoming DMA buffer allocated
+ by dma_alloc_coherent() will not see stale data after reading from
+ the DMA engine's MMIO status register to establish that the DMA
+ transfer has completed.
+
+ 5. A readX() by a CPU thread from the peripheral will complete before
+ any subsequent delay() loop can begin execution on the same thread.
+ This ensures that two MMIO register writes by the CPU to a peripheral
+ will arrive at least 1us apart if the first write is immediately read
+ back with readX() and udelay(1) is called prior to the second
+ writeX():
+
+ writel(42, DEVICE_REGISTER_0); // Arrives at the device...
+ readl(DEVICE_REGISTER_0);
+ udelay(1);
+ writel(42, DEVICE_REGISTER_1); // ...at least 1us before this.
+
+ The ordering properties of __iomem pointers obtained with non-default
+ attributes (e.g. those returned by ioremap_wc()) are specific to the
+ underlying architecture and therefore the guarantees listed above cannot
+ generally be relied upon for accesses to these types of mappings.
+
+ (*) readX_relaxed(), writeX_relaxed():
+
+ These are similar to readX() and writeX(), but provide weaker memory
+ ordering guarantees. Specifically, they do not guarantee ordering with
+ respect to locking, normal memory accesses or delay() loops (i.e.
+ bullets 2-5 above) but they are still guaranteed to be ordered with
+ respect to other accesses from the same CPU thread to the same
+ peripheral when operating on __iomem pointers mapped with the default
+ I/O attributes.
+
+ (*) readsX(), writesX():
+
+ The readsX() and writesX() MMIO accessors are designed for accessing
+ register-based, memory-mapped FIFOs residing on peripherals that are not
+ capable of performing DMA. Consequently, they provide only the ordering
+ guarantees of readX_relaxed() and writeX_relaxed(), as documented above.
- Ordinarily, these will be guaranteed to be fully ordered and uncombined,
- provided they're not accessing a prefetchable device.
+ (*) inX(), outX():
- However, intermediary hardware (such as a PCI bridge) may indulge in
- deferral if it so wishes; to flush a store, a load from the same location
- is preferred[*], but a load from the same device or from configuration
- space should suffice for PCI.
+ The inX() and outX() accessors are intended to access legacy port-mapped
+ I/O peripherals, which may require special instructions on some
+ architectures (notably x86). The port number of the peripheral being
+ accessed is passed as an argument.
- [*] NOTE! attempting to load from the same location as was written to may
- cause a malfunction - consider the 16550 Rx/Tx serial registers for
- example.
+ Since many CPU architectures ultimately access these peripherals via an
+ internal virtual memory mapping, the portable ordering guarantees
+ provided by inX() and outX() are the same as those provided by readX()
+ and writeX() respectively when accessing a mapping with the default I/O
+ attributes.
- Used with prefetchable I/O memory, an mmiowb() barrier may be required to
- force stores to be ordered.
+ Device drivers may expect outX() to emit a non-posted write transaction
+ that waits for a completion response from the I/O peripheral before
+ returning. This is not guaranteed by all architectures and is therefore
+ not part of the portable ordering semantics.
- Please refer to the PCI specification for more information on interactions
- between PCI transactions.
+ (*) insX(), outsX():
- (*) readX_relaxed(), writeX_relaxed()
+ As above, the insX() and outsX() accessors provide the same ordering
+ guarantees as readsX() and writesX() respectively when accessing a
+ mapping with the default I/O attributes.
- These are similar to readX() and writeX(), but provide weaker memory
- ordering guarantees. Specifically, they do not guarantee ordering with
- respect to normal memory accesses (e.g. DMA buffers) nor do they guarantee
- ordering with respect to LOCK or UNLOCK operations. If the latter is
- required, an mmiowb() barrier can be used. Note that relaxed accesses to
- the same peripheral are guaranteed to be ordered with respect to each
- other.
+ (*) ioreadX(), iowriteX():
- (*) ioreadX(), iowriteX()
+ These will perform appropriately for the type of access they're actually
+ doing, be it inX()/outX() or readX()/writeX().
- These will perform appropriately for the type of access they're actually
- doing, be it inX()/outX() or readX()/writeX().
+With the exception of the string accessors (insX(), outsX(), readsX() and
+writesX()), all of the above assume that the underlying peripheral is
+little-endian and will therefore perform byte-swapping operations on big-endian
+architectures.
========================================
diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild
index 70b783333965..89e87bbc987f 100644
--- a/arch/alpha/include/asm/Kbuild
+++ b/arch/alpha/include/asm/Kbuild
@@ -9,6 +9,7 @@ generic-y += irq_work.h
generic-y += kvm_para.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += preempt.h
generic-y += sections.h
generic-y += trace_clock.h
diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index 4c533fc94d62..ccf9d65166bb 100644
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -513,8 +513,6 @@ extern inline void writeq(u64 b, volatile void __iomem *addr)
#define writel_relaxed(b, addr) __raw_writel(b, addr)
#define writeq_relaxed(b, addr) __raw_writeq(b, addr)
-#define mmiowb()
-
/*
* String version of IO memory access ops:
*/
diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild
index decc306a3b52..393d4f5e1450 100644
--- a/arch/arc/include/asm/Kbuild
+++ b/arch/arc/include/asm/Kbuild
@@ -16,6 +16,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += msi.h
generic-y += parport.h
generic-y += percpu.h
diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
index 8fb51b7bf1d5..41deac2451af 100644
--- a/arch/arm/include/asm/Kbuild
+++ b/arch/arm/include/asm/Kbuild
@@ -9,6 +9,7 @@ generic-y += kdebug.h
generic-y += local.h
generic-y += local64.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += msi.h
generic-y += parport.h
generic-y += preempt.h
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 6b51826ab3d1..7e22c81398c4 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -281,8 +281,6 @@ extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
extern void _memset_io(volatile void __iomem *, int, size_t);
-#define mmiowb()
-
/*
* Memory access primitives
* ------------------------
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 60a933b07001..eb0df239a759 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -13,6 +13,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += msi.h
generic-y += qrwlock.h
generic-y += qspinlock.h
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 8bb7210ac286..b807cb9b517d 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -124,8 +124,6 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
#define __io_par(v) __iormb(v)
#define __iowmb() wmb()
-#define mmiowb() do { } while (0)
-
/*
* Relaxed I/O memory access primitives. These follow the Device memory
* ordering rules but do not guarantee any ordering relative to Normal memory
diff --git a/arch/c6x/include/asm/Kbuild b/arch/c6x/include/asm/Kbuild
index 249c9f6f26dc..6b168d32fbff 100644
--- a/arch/c6x/include/asm/Kbuild
+++ b/arch/c6x/include/asm/Kbuild
@@ -23,6 +23,7 @@ generic-y += kvm_para.h
generic-y += local.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += mmu.h
generic-y += mmu_context.h
generic-y += pci.h
diff --git a/arch/csky/include/asm/Kbuild b/arch/csky/include/asm/Kbuild
index 2a0abe8f2a35..95f4e550db8a 100644
--- a/arch/csky/include/asm/Kbuild
+++ b/arch/csky/include/asm/Kbuild
@@ -28,6 +28,7 @@ generic-y += linkage.h
generic-y += local.h
generic-y += local64.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += module.h
generic-y += mutex.h
generic-y += pci.h
diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild
index e3dead402e5f..123d8f54be4a 100644
--- a/arch/h8300/include/asm/Kbuild
+++ b/arch/h8300/include/asm/Kbuild
@@ -29,6 +29,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += mmu.h
generic-y += mmu_context.h
generic-y += module.h
diff --git a/arch/hexagon/include/asm/Kbuild b/arch/hexagon/include/asm/Kbuild
index 3ff5f297acda..6234a303d2a3 100644
--- a/arch/hexagon/include/asm/Kbuild
+++ b/arch/hexagon/include/asm/Kbuild
@@ -24,6 +24,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += pci.h
generic-y += percpu.h
generic-y += preempt.h
diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index e17262ad125e..3d0ae09c2b8e 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h
@@ -184,8 +184,6 @@ static inline void writel(u32 data, volatile void __iomem *addr)
#define writew_relaxed __raw_writew
#define writel_relaxed __raw_writel
-#define mmiowb()
-
/*
* Need an mtype somewhere in here, for cache type deals?
* This is probably too long for an inline.
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 1e6fef69bb01..a511d62d447a 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -113,20 +113,6 @@ extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
*/
#define __ia64_mf_a() ia64_mfa()
-/**
- * ___ia64_mmiowb - I/O write barrier
- *
- * Ensure ordering of I/O space writes. This will make sure that writes
- * following the barrier will arrive after all previous writes. For most
- * ia64 platforms, this is a simple 'mf.a' instruction.
- *
- * See Documentation/driver-api/device-io.rst for more information.
- */
-static inline void ___ia64_mmiowb(void)
-{
- ia64_mfa();
-}
-
static inline void*
__ia64_mk_io_addr (unsigned long port)
{
@@ -161,7 +147,6 @@ __ia64_mk_io_addr (unsigned long port)
#define __ia64_writew ___ia64_writew
#define __ia64_writel ___ia64_writel
#define __ia64_writeq ___ia64_writeq
-#define __ia64_mmiowb ___ia64_mmiowb
/*
* For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure
@@ -296,7 +281,6 @@ __outsl (unsigned long port, const void *src, unsigned long count)
#define __outb platform_outb
#define __outw platform_outw
#define __outl platform_outl
-#define __mmiowb platform_mmiowb
#define inb(p) __inb(p)
#define inw(p) __inw(p)
@@ -310,7 +294,6 @@ __outsl (unsigned long port, const void *src, unsigned long count)
#define outsb(p,s,c) __outsb(p,s,c)
#define outsw(p,s,c) __outsw(p,s,c)
#define outsl(p,s,c) __outsl(p,s,c)
-#define mmiowb() __mmiowb()
/*
* The address passed to these functions are ioremap()ped already.
diff --git a/arch/ia64/include/asm/mmiowb.h b/arch/ia64/include/asm/mmiowb.h
new file mode 100644
index 000000000000..297b85ac84a0
--- /dev/null
+++ b/arch/ia64/include/asm/mmiowb.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_IA64_MMIOWB_H
+#define _ASM_IA64_MMIOWB_H
+
+#include <asm/machvec.h>
+
+/**
+ * ___ia64_mmiowb - I/O write barrier
+ *
+ * Ensure ordering of I/O space writes. This will make sure that writes
+ * following the barrier will arrive after all previous writes. For most
+ * ia64 platforms, this is a simple 'mf.a' instruction.
+ */
+static inline void ___ia64_mmiowb(void)
+{
+ ia64_mfa();
+}
+
+#define __ia64_mmiowb ___ia64_mmiowb
+#define mmiowb() platform_mmiowb()
+
+#include <asm-generic/mmiowb.h>
+
+#endif /* _ASM_IA64_MMIOWB_H */
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h
index afd0b3121b4c..5f620e66384e 100644
--- a/arch/ia64/include/asm/spinlock.h
+++ b/arch/ia64/include/asm/spinlock.h
@@ -73,6 +73,8 @@ static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
{
unsigned short *p = (unsigned short *)&lock->lock + 1, tmp;
+ /* This could be optimised with ARCH_HAS_MMIOWB */
+ mmiowb();
asm volatile ("ld2.bias %0=[%1]" : "=r"(tmp) : "r"(p));
WRITE_ONCE(*p, (tmp + 2) & ~1);
}
diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
index 2c359d9e80f6..0ddae4a74adb 100644
--- a/arch/m68k/include/asm/Kbuild
+++ b/arch/m68k/include/asm/Kbuild
@@ -18,6 +18,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += percpu.h
generic-y += preempt.h
generic-y += sections.h
diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
index 782b78f8a048..6c03ca5bc436 100644
--- a/arch/m68k/include/asm/io_mm.h
+++ b/arch/m68k/include/asm/io_mm.h
@@ -377,8 +377,6 @@ static inline void isa_delay(void)
#define writesw(port, buf, nr) raw_outsw((port), (u16 *)(buf), (nr))
#define writesl(port, buf, nr) raw_outsl((port), (u32 *)(buf), (nr))
-#define mmiowb()
-
#ifndef CONFIG_SUN3
#define IO_SPACE_LIMIT 0xffff
#else
diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild
index 1a8285c3f693..17a8d0a62038 100644
--- a/arch/microblaze/include/asm/Kbuild
+++ b/arch/microblaze/include/asm/Kbuild
@@ -23,6 +23,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += parport.h
generic-y += percpu.h
generic-y += preempt.h
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 845fbbc7a2e3..29997e42480e 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -102,9 +102,6 @@ static inline void set_io_port_base(unsigned long base)
#define iobarrier_w() wmb()
#define iobarrier_sync() iob()
-/* Some callers use this older API instead. */
-#define mmiowb() iobarrier_w()
-
/*
* virt_to_phys - map virtual addresses to physical
* @address: address to remap
diff --git a/arch/mips/include/asm/mmiowb.h b/arch/mips/include/asm/mmiowb.h
new file mode 100644
index 000000000000..a40824e3ef8e
--- /dev/null
+++ b/arch/mips/include/asm/mmiowb.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_MMIOWB_H
+#define _ASM_MMIOWB_H
+
+#include <asm/io.h>
+
+#define mmiowb() iobarrier_w()
+
+#include <asm-generic/mmiowb.h>
+
+#endif /* _ASM_MMIOWB_H */
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index ee81297d9117..8a88eb265516 100644
--- a/arch/mips/include/asm/spinlock.h
+++ b/arch/mips/include/asm/spinlock.h
@@ -11,6 +11,21 @@
#include <asm/processor.h>
#include <asm/qrwlock.h>
+
+#include <asm-generic/qspinlock_types.h>
+
+#define queued_spin_unlock queued_spin_unlock
+/**
+ * queued_spin_unlock - release a queued spinlock
+ * @lock : Pointer to queued spinlock structure
+ */
+static inline void queued_spin_unlock(struct qspinlock *lock)
+{
+ /* This could be optimised with ARCH_HAS_MMIOWB */
+ mmiowb();
+ smp_store_release(&lock->locked, 0);
+}
+
#include <asm/qspinlock.h>
#endif /* _ASM_SPINLOCK_H */
diff --git a/arch/nds32/include/asm/Kbuild b/arch/nds32/include/asm/Kbuild
index 64ceff7ab99b..688b6ed26227 100644
--- a/arch/nds32/include/asm/Kbuild
+++ b/arch/nds32/include/asm/Kbuild
@@ -31,6 +31,7 @@ generic-y += limits.h
generic-y += local.h
generic-y += local64.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += parport.h
generic-y += pci.h
generic-y += percpu.h
diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
index 71cd226d6863..5ef8ae5ba833 100644
--- a/arch/nds32/include/asm/io.h
+++ b/arch/nds32/include/asm/io.h
@@ -55,8 +55,6 @@ static inline u32 __raw_readl(const volatile void __iomem *addr)
#define __iormb() rmb()
#define __iowmb() wmb()
-#define mmiowb() __asm__ __volatile__ ("msync all" : : : "memory");
-
/*
* {read,write}{b,w,l,q}_relaxed() are like the regular version, but
* are not guaranteed to provide ordering against spinlocks or memory
diff --git a/arch/nios2/include/asm/Kbuild b/arch/nios2/include/asm/Kbuild
index 88a667d12aaa..d7ef3512504a 100644
--- a/arch/nios2/include/asm/Kbuild
+++ b/arch/nios2/include/asm/Kbuild
@@ -27,6 +27,7 @@ generic-y += kvm_para.h
generic-y += local.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += module.h
generic-y += pci.h
generic-y += percpu.h
diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
index 22aa97136c01..1919cc5e0f11 100644
--- a/arch/openrisc/include/asm/Kbuild
+++ b/arch/openrisc/include/asm/Kbuild
@@ -24,6 +24,7 @@ generic-y += kvm_para.h
generic-y += local.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += module.h
generic-y += pci.h
generic-y += percpu.h
diff --git a/arch/parisc/include/asm/Kbuild b/arch/parisc/include/asm/Kbuild
index 9bcd0c903dbb..b8c7db777144 100644
--- a/arch/parisc/include/asm/Kbuild
+++ b/arch/parisc/include/asm/Kbuild
@@ -16,6 +16,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += percpu.h
generic-y += preempt.h
generic-y += seccomp.h
diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h
index 30a8315d5c07..93d37010b375 100644
--- a/arch/parisc/include/asm/io.h
+++ b/arch/parisc/include/asm/io.h
@@ -229,8 +229,6 @@ static inline void writeq(unsigned long long q, volatile void __iomem *addr)
#define writel_relaxed(l, addr) writel(l, addr)
#define writeq_relaxed(q, addr) writeq(q, addr)
-#define mmiowb() do { } while (0)
-
void memset_io(volatile void __iomem *addr, unsigned char val, int count);
void memcpy_fromio(void *dst, const volatile void __iomem *src, int count);
void memcpy_toio(volatile void __iomem *dst, const void *src, int count);
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 88a4fb3647a2..fa7219ffeadc 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -125,6 +125,7 @@ config PPC
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV
+ select ARCH_HAS_MMIOWB if PPC64
select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_PMEM_API if PPC64
select ARCH_HAS_PTE_SPECIAL
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index 4b73847e9b95..1fad67b46409 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -34,14 +34,11 @@ extern struct pci_dev *isa_bridge_pcidev;
#include <asm/byteorder.h>
#include <asm/synch.h>
#include <asm/delay.h>
+#include <asm/mmiowb.h>
#include <asm/mmu.h>
#include <asm/ppc_asm.h>
#include <asm/pgtable.h>
-#ifdef CONFIG_PPC64
-#include <asm/paca.h>
-#endif
-
#define SIO_CONFIG_RA 0x398
#define SIO_CONFIG_RD 0x399
@@ -107,12 +104,6 @@ extern bool isa_io_special;
*
*/
-#ifdef CONFIG_PPC64
-#define IO_SET_SYNC_FLAG() do { local_paca->io_sync = 1; } while(0)
-#else
-#define IO_SET_SYNC_FLAG()
-#endif
-
#define DEF_MMIO_IN_X(name, size, insn) \
static inline u##size name(const volatile u##size __iomem *addr) \
{ \
@@ -127,7 +118,7 @@ static inline void name(volatile u##size __iomem *addr, u##size val) \
{ \
__asm__ __volatile__("sync;"#insn" %1,%y0" \
: "=Z" (*addr) : "r" (val) : "memory"); \
- IO_SET_SYNC_FLAG(); \
+ mmiowb_set_pending(); \
}
#define DEF_MMIO_IN_D(name, size, insn) \
@@ -144,7 +135,7 @@ static inline void name(volatile u##size __iomem *addr, u##size val) \
{ \
__asm__ __volatile__("sync;"#insn"%U0%X0 %1,%0" \
: "=m" (*addr) : "r" (val) : "memory"); \
- IO_SET_SYNC_FLAG(); \
+ mmiowb_set_pending(); \
}
DEF_MMIO_IN_D(in_8, 8, lbz);
@@ -652,24 +643,6 @@ static inline void name at \
#include <asm-generic/iomap.h>
-#ifdef CONFIG_PPC32
-#define mmiowb()
-#else
-/*
- * Enforce synchronisation of stores vs. spin_unlock
- * (this does it explicitly, though our implementation of spin_unlock
- * does it implicitely too)
- */
-static inline void mmiowb(void)
-{
- unsigned long tmp;
-
- __asm__ __volatile__("sync; li %0,0; stb %0,%1(13)"
- : "=&r" (tmp) : "i" (offsetof(struct paca_struct, io_sync))
- : "memory");
-}
-#endif /* !CONFIG_PPC32 */
-
static inline void iosync(void)
{
__asm__ __volatile__ ("sync" : : : "memory");
diff --git a/arch/powerpc/include/asm/mmiowb.h b/arch/powerpc/include/asm/mmiowb.h
new file mode 100644
index 000000000000..74a00127eb20
--- /dev/null
+++ b/arch/powerpc/include/asm/mmiowb.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_MMIOWB_H
+#define _ASM_POWERPC_MMIOWB_H
+
+#ifdef CONFIG_MMIOWB
+
+#include <linux/compiler.h>
+#include <asm/barrier.h>
+#include <asm/paca.h>
+
+#define arch_mmiowb_state() (&local_paca->mmiowb_state)
+#define mmiowb() mb()
+
+#endif /* CONFIG_MMIOWB */
+
+#include <asm-generic/mmiowb.h>
+
+#endif /* _ASM_POWERPC_MMIOWB_H */
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index e843bc5d1a0f..134e912d403f 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -34,6 +34,8 @@
#include <asm/cpuidle.h>
#include <asm/atomic.h>
+#include <asm-generic/mmiowb_types.h>
+
register struct paca_struct *local_paca asm("r13");
#if defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_SMP)
@@ -171,7 +173,6 @@ struct paca_struct {
u16 trap_save; /* Used when bad stack is encountered */
u8 irq_soft_mask; /* mask for irq soft masking */
u8 irq_happened; /* irq happened while soft-disabled */
- u8 io_sync; /* writel() needs spin_unlock sync */
u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
u8 nap_state_lost; /* NV GPR values lost in power7_idle */
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
@@ -264,6 +265,9 @@ struct paca_struct {
#ifdef CONFIG_STACKPROTECTOR
unsigned long canary;
#endif
+#ifdef CONFIG_MMIOWB
+ struct mmiowb_state mmiowb_state;
+#endif
} ____cacheline_aligned;
extern void copy_mm_to_paca(struct mm_struct *mm);
diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h
index 685c72310f5d..15b39c407c4e 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -39,19 +39,6 @@
#define LOCK_TOKEN 1
#endif
-#if defined(CONFIG_PPC64) && defined(CONFIG_SMP)
-#define CLEAR_IO_SYNC (get_paca()->io_sync = 0)
-#define SYNC_IO do { \
- if (unlikely(get_paca()->io_sync)) { \
- mb(); \
- get_paca()->io_sync = 0; \
- } \
- } while (0)
-#else
-#define CLEAR_IO_SYNC
-#define SYNC_IO
-#endif
-
#ifdef CONFIG_PPC_PSERIES
#define vcpu_is_preempted vcpu_is_preempted
static inline bool vcpu_is_preempted(int cpu)
@@ -99,7 +86,6 @@ static inline unsigned long __arch_spin_trylock(arch_spinlock_t *lock)
static inline int arch_spin_trylock(arch_spinlock_t *lock)
{
- CLEAR_IO_SYNC;
return __arch_spin_trylock(lock) == 0;
}
@@ -130,7 +116,6 @@ extern void __rw_yield(arch_rwlock_t *lock);
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
- CLEAR_IO_SYNC;
while (1) {
if (likely(__arch_spin_trylock(lock) == 0))
break;
@@ -148,7 +133,6 @@ void arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
{
unsigned long flags_dis;
- CLEAR_IO_SYNC;
while (1) {
if (likely(__arch_spin_trylock(lock) == 0))
break;
@@ -167,7 +151,6 @@ void arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
- SYNC_IO;
__asm__ __volatile__("# arch_spin_unlock\n\t"
PPC_RELEASE_BARRIER: : :"memory");
lock->slock = 0;
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index a0f44f992360..13c6a47e6150 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2429,7 +2429,10 @@ static void dump_one_paca(int cpu)
DUMP(p, trap_save, "%#-*x");
DUMP(p, irq_soft_mask, "%#-*x");
DUMP(p, irq_happened, "%#-*x");
- DUMP(p, io_sync, "%#-*x");
+#ifdef CONFIG_MMIOWB
+ DUMP(p, mmiowb_state.nesting_count, "%#-*x");
+ DUMP(p, mmiowb_state.mmiowb_pending, "%#-*x");
+#endif
DUMP(p, irq_work_pending, "%#-*x");
DUMP(p, nap_state_lost, "%#-*x");
DUMP(p, sprg_vdso, "%#-*llx");
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 0582260fb6c2..e66745decea1 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -48,6 +48,7 @@ config RISCV
select RISCV_TIMER
select GENERIC_IRQ_MULTI_HANDLER
select ARCH_HAS_PTE_SPECIAL
+ select ARCH_HAS_MMIOWB
select HAVE_EBPF_JIT if 64BIT
config MMU
diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h
index 1d9c1376dc64..744fd92e77bc 100644
--- a/arch/riscv/include/asm/io.h
+++ b/arch/riscv/include/asm/io.h
@@ -20,6 +20,7 @@
#define _ASM_RISCV_IO_H
#include <linux/types.h>
+#include <asm/mmiowb.h>
extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
@@ -100,18 +101,6 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
#endif
/*
- * FIXME: I'm flip-flopping on whether or not we should keep this or enforce
- * the ordering with I/O on spinlocks like PowerPC does. The worry is that
- * drivers won't get this correct, but I also don't want to introduce a fence
- * into the lock code that otherwise only uses AMOs (and is essentially defined
- * by the ISA to be correct). For now I'm leaving this here: "o,w" is
- * sufficient to ensure that all writes to the device have completed before the
- * write to the spinlock is allowed to commit. I surmised this from reading
- * "ACQUIRES VS I/O ACCESSES" in memory-barriers.txt.
- */
-#define mmiowb() __asm__ __volatile__ ("fence o,w" : : : "memory");
-
-/*
* Unordered I/O memory access primitives. These are even more relaxed than
* the relaxed versions, as they don't even order accesses between successive
* operations to the I/O regions.
@@ -165,7 +154,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
#define __io_br() do {} while (0)
#define __io_ar(v) __asm__ __volatile__ ("fence i,r" : : : "memory");
#define __io_bw() __asm__ __volatile__ ("fence w,o" : : : "memory");
-#define __io_aw() do {} while (0)
+#define __io_aw() mmiowb_set_pending()
#define readb(c) ({ u8 __v; __io_br(); __v = readb_cpu(c); __io_ar(__v); __v; })
#define readw(c) ({ u16 __v; __io_br(); __v = readw_cpu(c); __io_ar(__v); __v; })
diff --git a/arch/riscv/include/asm/mmiowb.h b/arch/riscv/include/asm/mmiowb.h
new file mode 100644
index 000000000000..5d7e3a2b4e3b
--- /dev/null
+++ b/arch/riscv/include/asm/mmiowb.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_RISCV_MMIOWB_H
+#define _ASM_RISCV_MMIOWB_H
+
+/*
+ * "o,w" is sufficient to ensure that all writes to the device have completed
+ * before the write to the spinlock is allowed to commit.
+ */
+#define mmiowb() __asm__ __volatile__ ("fence o,w" : : : "memory");
+
+#include <asm-generic/mmiowb.h>
+
+#endif /* ASM_RISCV_MMIOWB_H */
diff --git a/arch/s390/include/asm/Kbuild b/arch/s390/include/asm/Kbuild
index d5fadefea33c..2531f673f099 100644
--- a/arch/s390/include/asm/Kbuild
+++ b/arch/s390/include/asm/Kbuild
@@ -20,6 +20,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += trace_clock.h
generic-y += unaligned.h
generic-y += word-at-a-time.h
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index 4f7f235f15f8..c28e37a344ad 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -229,9 +229,6 @@ __BUILD_IOPORT_STRING(q, u64)
#define IO_SPACE_LIMIT 0xffffffff
-/* synco on SH-4A, otherwise a nop */
-#define mmiowb() wmb()
-
/* We really want to try and get these to memcpy etc */
void memcpy_fromio(void *, const volatile void __iomem *, unsigned long);
void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
diff --git a/arch/sh/include/asm/mmiowb.h b/arch/sh/include/asm/mmiowb.h
new file mode 100644
index 000000000000..535d59735f1d
--- /dev/null
+++ b/arch/sh/include/asm/mmiowb.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_MMIOWB_H
+#define __ASM_SH_MMIOWB_H
+
+#include <asm/barrier.h>
+
+/* synco on SH-4A, otherwise a nop */
+#define mmiowb() wmb()
+
+#include <asm-generic/mmiowb.h>
+
+#endif /* __ASM_SH_MMIOWB_H */
diff --git a/arch/sh/include/asm/spinlock-llsc.h b/arch/sh/include/asm/spinlock-llsc.h
index 786ee0fde3b0..7fd929cd2e7a 100644
--- a/arch/sh/include/asm/spinlock-llsc.h
+++ b/arch/sh/include/asm/spinlock-llsc.h
@@ -47,6 +47,8 @@ static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
unsigned long tmp;
+ /* This could be optimised with ARCH_HAS_MMIOWB */
+ mmiowb();
__asm__ __volatile__ (
"mov #1, %0 ! arch_spin_unlock \n\t"
"mov.l %0, @%1 \n\t"
diff --git a/arch/sparc/include/asm/Kbuild b/arch/sparc/include/asm/Kbuild
index 2ca3200d3616..95c44380b1d6 100644
--- a/arch/sparc/include/asm/Kbuild
+++ b/arch/sparc/include/asm/Kbuild
@@ -15,6 +15,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += module.h
generic-y += msi.h
generic-y += preempt.h
diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h
index b162c23ae8c2..688911051b44 100644
--- a/arch/sparc/include/asm/io_64.h
+++ b/arch/sparc/include/asm/io_64.h
@@ -396,8 +396,6 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src,
}
}
-#define mmiowb()
-
#ifdef __KERNEL__
/* On sparc64 we have the whole physical IO address space accessible
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
index 00bcbe2326d9..b506ad06aefc 100644
--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -16,6 +16,7 @@ generic-y += irq_work.h
generic-y += kdebug.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += param.h
generic-y += pci.h
generic-y += percpu.h
diff --git a/arch/unicore32/include/asm/Kbuild b/arch/unicore32/include/asm/Kbuild
index d77d953c04c1..b301a0b3c0b2 100644
--- a/arch/unicore32/include/asm/Kbuild
+++ b/arch/unicore32/include/asm/Kbuild
@@ -22,6 +22,7 @@ generic-y += kvm_para.h
generic-y += local.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += module.h
generic-y += parport.h
generic-y += percpu.h
diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index a0ab9ab61c75..eebd05942e6c 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -11,3 +11,4 @@ generic-y += early_ioremap.h
generic-y += export.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 686247db3106..a06a9f8294ea 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -90,8 +90,6 @@ build_mmio_write(__writel, "l", unsigned int, "r", )
#define __raw_writew __writew
#define __raw_writel __writel
-#define mmiowb() barrier()
-
#ifdef CONFIG_X86_64
build_mmio_read(readq, "q", u64, "=r", :"memory")
diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild
index 4148090cafb0..35f83c4bf239 100644
--- a/arch/xtensa/include/asm/Kbuild
+++ b/arch/xtensa/include/asm/Kbuild
@@ -20,6 +20,7 @@ generic-y += local.h
generic-y += local64.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
+generic-y += mmiowb.h
generic-y += param.h
generic-y += percpu.h
generic-y += preempt.h
diff --git a/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
index 4c97478d44bd..5826c2c98a50 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
@@ -303,8 +303,6 @@ static void post_se_instr(struct nitrox_softreq *sr,
/* Ring doorbell with count 1 */
writeq(1, cmdq->dbell_csr_addr);
- /* orders the doorbell rings */
- mmiowb();
cmdq->write_idx = incr_index(idx, 1, ndev->qlen);
@@ -599,8 +597,6 @@ void pkt_slc_resp_tasklet(unsigned long data)
* MSI-X interrupt generates if Completion count > Threshold
*/
writeq(slc_cnts.value, cmdq->compl_cnt_csr_addr);
- /* order the writes */
- mmiowb();
if (atomic_read(&cmdq->backlog_count))
schedule_work(&cmdq->backlog_qflush);
diff --git a/drivers/dma/txx9dmac.c b/drivers/dma/txx9dmac.c
index eb45af71d3a3..e8d0881b64d8 100644
--- a/drivers/dma/txx9dmac.c
+++ b/drivers/dma/txx9dmac.c
@@ -327,7 +327,6 @@ static void txx9dmac_reset_chan(struct txx9dmac_chan *dc)
channel_writel(dc, SAIR, 0);
channel_writel(dc, DAIR, 0);
channel_writel(dc, CCR, 0);
- mmiowb();
}
/* Called with dc->lock held and bh disabled */
@@ -954,7 +953,6 @@ static void txx9dmac_chain_dynamic(struct txx9dmac_chan *dc,
dma_sync_single_for_device(chan2parent(&dc->chan),
prev->txd.phys, ddev->descsize,
DMA_TO_DEVICE);
- mmiowb();
if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) &&
channel_read_CHAR(dc) == prev->txd.phys)
/* Restart chain DMA */
@@ -1080,7 +1078,6 @@ static void txx9dmac_free_chan_resources(struct dma_chan *chan)
static void txx9dmac_off(struct txx9dmac_dev *ddev)
{
dma_writel(ddev, MCR, 0);
- mmiowb();
}
static int __init txx9dmac_chan_probe(struct platform_device *pdev)
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 45c048751f3b..7183ab34269e 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2939,7 +2939,6 @@ static void set_multichannel_mask(struct fw_ohci *ohci, u64 channels)
reg_write(ohci, OHCI1394_IRMultiChanMaskLoClear, ~lo);
reg_write(ohci, OHCI1394_IRMultiChanMaskHiSet, hi);
reg_write(ohci, OHCI1394_IRMultiChanMaskLoSet, lo);
- mmiowb();
ohci->mc_channels = channels;
}
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index f125a62eba8c..a46bffe2b288 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -182,7 +182,6 @@ static void g4x_write_infoframe(struct intel_encoder *encoder,
I915_WRITE(VIDEO_DIP_CTL, val);
- mmiowb();
for (i = 0; i < len; i += 4) {
I915_WRITE(VIDEO_DIP_DATA, *data);
data++;
@@ -190,7 +189,6 @@ static void g4x_write_infoframe(struct intel_encoder *encoder,
/* Write every possible data byte to force correct ECC calculation. */
for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
I915_WRITE(VIDEO_DIP_DATA, 0);
- mmiowb();
val |= g4x_infoframe_enable(type);
val &= ~VIDEO_DIP_FREQ_MASK;
@@ -237,7 +235,6 @@ static void ibx_write_infoframe(struct intel_encoder *encoder,
I915_WRITE(reg, val);
- mmiowb();
for (i = 0; i < len; i += 4) {
I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
data++;
@@ -245,7 +242,6 @@ static void ibx_write_infoframe(struct intel_encoder *encoder,
/* Write every possible data byte to force correct ECC calculation. */
for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), 0);
- mmiowb();
val |= g4x_infoframe_enable(type);
val &= ~VIDEO_DIP_FREQ_MASK;
@@ -298,7 +294,6 @@ static void cpt_write_infoframe(struct intel_encoder *encoder,
I915_WRITE(reg, val);
- mmiowb();
for (i = 0; i < len; i += 4) {
I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
data++;
@@ -306,7 +301,6 @@ static void cpt_write_infoframe(struct intel_encoder *encoder,
/* Write every possible data byte to force correct ECC calculation. */
for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), 0);
- mmiowb();
val |= g4x_infoframe_enable(type);
val &= ~VIDEO_DIP_FREQ_MASK;
@@ -352,7 +346,6 @@ static void vlv_write_infoframe(struct intel_encoder *encoder,
I915_WRITE(reg, val);
- mmiowb();
for (i = 0; i < len; i += 4) {
I915_WRITE(VLV_TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
data++;
@@ -360,7 +353,6 @@ static void vlv_write_infoframe(struct intel_encoder *encoder,
/* Write every possible data byte to force correct ECC calculation. */
for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
I915_WRITE(VLV_TVIDEO_DIP_DATA(intel_crtc->pipe), 0);
- mmiowb();
val |= g4x_infoframe_enable(type);
val &= ~VIDEO_DIP_FREQ_MASK;
@@ -406,7 +398,6 @@ static void hsw_write_infoframe(struct intel_encoder *encoder,
val &= ~hsw_infoframe_enable(type);
I915_WRITE(ctl_reg, val);
- mmiowb();
for (i = 0; i < len; i += 4) {
I915_WRITE(hsw_dip_data_reg(dev_priv, cpu_transcoder,
type, i >> 2), *data);
@@ -416,7 +407,6 @@ static void hsw_write_infoframe(struct intel_encoder *encoder,
for (; i < data_size; i += 4)
I915_WRITE(hsw_dip_data_reg(dev_priv, cpu_transcoder,
type, i >> 2), 0);
- mmiowb();
val |= hsw_infoframe_enable(type);
I915_WRITE(ctl_reg, val);
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index 67d4a7d4acc8..88d132edc4e3 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -156,7 +156,6 @@ static u16 tx4939ide_check_error_ints(ide_hwif_t *hwif)
u16 sysctl = tx4939ide_readw(base, TX4939IDE_Sys_Ctl);
tx4939ide_writew(sysctl | 0x4000, base, TX4939IDE_Sys_Ctl);
- mmiowb();
/* wait 12GBUSCLK (typ. 60ns @ GBUS200MHz, max 270ns) */
ndelay(270);
tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
@@ -396,7 +395,6 @@ static void tx4939ide_init_hwif(ide_hwif_t *hwif)
/* Soft Reset */
tx4939ide_writew(0x8000, base, TX4939IDE_Sys_Ctl);
- mmiowb();
/* at least 20 GBUSCLK (typ. 100ns @ GBUS200MHz, max 450ns) */
ndelay(450);
tx4939ide_writew(0x0000, base, TX4939IDE_Sys_Ctl);
diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c
index 9784c6c0d2ec..addefae16c9c 100644
--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -8365,7 +8365,6 @@ static inline void clear_recv_intr(struct hfi1_ctxtdata *rcd)
struct hfi1_devdata *dd = rcd->dd;
u32 addr = CCE_INT_CLEAR + (8 * rcd->ireg);
- mmiowb(); /* make sure everything before is written */
write_csr(dd, addr, rcd->imask);
/* force the above write on the chip and get a value back */
(void)read_csr(dd, addr);
@@ -11803,12 +11802,10 @@ void update_usrhead(struct hfi1_ctxtdata *rcd, u32 hd, u32 updegr, u32 egrhd,
<< RCV_EGR_INDEX_HEAD_HEAD_SHIFT;
write_uctxt_csr(dd, ctxt, RCV_EGR_INDEX_HEAD, reg);
}
- mmiowb();
reg = ((u64)rcv_intr_count << RCV_HDR_HEAD_COUNTER_SHIFT) |
(((u64)hd & RCV_HDR_HEAD_HEAD_MASK)
<< RCV_HDR_HEAD_HEAD_SHIFT);
write_uctxt_csr(dd, ctxt, RCV_HDR_HEAD, reg);
- mmiowb();
}
u32 hdrqempty(struct hfi1_ctxtdata *rcd)
diff --git a/drivers/infiniband/hw/hfi1/pio.c b/drivers/infiniband/hw/hfi1/pio.c
index a1de566fe95e..16ba9d52e1b9 100644
--- a/drivers/infiniband/hw/hfi1/pio.c
+++ b/drivers/infiniband/hw/hfi1/pio.c
@@ -1578,7 +1578,6 @@ void hfi1_sc_wantpiobuf_intr(struct send_context *sc, u32 needint)
sc_del_credit_return_intr(sc);
trace_hfi1_wantpiointr(sc, needint, sc->credit_ctrl);
if (needint) {
- mmiowb();
sc_return_credits(sc);
}
}
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 97515c340134..c8555f7704d8 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -1750,8 +1750,6 @@ static int hns_roce_v1_post_mbox(struct hns_roce_dev *hr_dev, u64 in_param,
writel(val, hcr + 5);
- mmiowb();
-
return 0;
}
diff --git a/drivers/infiniband/hw/i40iw/i40iw_osdep.h b/drivers/infiniband/hw/i40iw/i40iw_osdep.h
index f27be3e7830b..d474aad62a81 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_osdep.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_osdep.h
@@ -211,7 +211,7 @@ enum i40iw_status_code i40iw_hw_manage_vf_pble_bp(struct i40iw_device *iwdev,
struct i40iw_sc_vsi;
void i40iw_hw_stats_start_timer(struct i40iw_sc_vsi *vsi);
void i40iw_hw_stats_stop_timer(struct i40iw_sc_vsi *vsi);
-#define i40iw_mmiowb() mmiowb()
+#define i40iw_mmiowb() do { } while (0)
void i40iw_wr32(struct i40iw_hw *hw, u32 reg, u32 value);
u32 i40iw_rd32(struct i40iw_hw *hw, u32 reg);
#endif /* _I40IW_OSDEP_H_ */
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 429a59c5801c..9426936460f8 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -3744,12 +3744,6 @@ out:
writel_relaxed(qp->doorbell_qpn,
to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
- /*
- * Make sure doorbells don't leak out of SQ spinlock
- * and reach the HCA out of order.
- */
- mmiowb();
-
stamp_send_wqe(qp, ind + qp->sq_spare_wqes - 1);
qp->sq_next_wqe = ind;
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 8870c350fda0..8aafb2208899 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -5126,7 +5126,6 @@ out:
/* Make sure doorbells don't leak out of SQ spinlock
* and reach the HCA out of order.
*/
- mmiowb();
bf->offset ^= bf->buf_size;
}
diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.c b/drivers/infiniband/hw/mthca/mthca_cmd.c
index 83aa47eb81a9..bdf5ed38de22 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.c
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
@@ -292,12 +292,6 @@ static int mthca_cmd_post(struct mthca_dev *dev,
err = mthca_cmd_post_hcr(dev, in_param, out_param, in_modifier,
op_modifier, op, token, event);
- /*
- * Make sure that our HCR writes don't get mixed in with
- * writes from another CPU starting a FW command.
- */
- mmiowb();
-
mutex_unlock(&dev->cmd.hcr_mutex);
return err;
}
diff --git a/drivers/infiniband/hw/mthca/mthca_cq.c b/drivers/infiniband/hw/mthca/mthca_cq.c
index a6531ffe29a6..877a6daffa98 100644
--- a/drivers/infiniband/hw/mthca/mthca_cq.c
+++ b/drivers/infiniband/hw/mthca/mthca_cq.c
@@ -211,11 +211,6 @@ static inline void update_cons_index(struct mthca_dev *dev, struct mthca_cq *cq,
mthca_write64(MTHCA_TAVOR_CQ_DB_INC_CI | cq->cqn, incr - 1,
dev->kar + MTHCA_CQ_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
- /*
- * Make sure doorbells don't leak out of CQ spinlock
- * and reach the HCA out of order:
- */
- mmiowb();
}
}
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index 7a5b25d13faa..d65b189f20ea 100644
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -1809,11 +1809,6 @@ out:
(qp->qpn << 8) | size0,
dev->kar + MTHCA_SEND_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
- /*
- * Make sure doorbells don't leak out of SQ spinlock
- * and reach the HCA out of order:
- */
- mmiowb();
}
qp->sq.next_ind = ind;
@@ -1924,12 +1919,6 @@ out:
qp->rq.next_ind = ind;
qp->rq.head += nreq;
- /*
- * Make sure doorbells don't leak out of RQ spinlock and reach
- * the HCA out of order:
- */
- mmiowb();
-
spin_unlock_irqrestore(&qp->rq.lock, flags);
return err;
}
@@ -2164,12 +2153,6 @@ out:
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
}
- /*
- * Make sure doorbells don't leak out of SQ spinlock and reach
- * the HCA out of order:
- */
- mmiowb();
-
spin_unlock_irqrestore(&qp->sq.lock, flags);
return err;
}
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 06b920385512..a85935ccce88 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -570,12 +570,6 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
}
- /*
- * Make sure doorbells don't leak out of SRQ spinlock and
- * reach the HCA out of order:
- */
- mmiowb();
-
spin_unlock_irqrestore(&srq->lock, flags);
return err;
}
diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index 59ad4202422c..8686a98e113d 100644
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -773,9 +773,6 @@ static void doorbell_cq(struct qedr_cq *cq, u32 cons, u8 flags)
cq->db.data.agg_flags = flags;
cq->db.data.value = cpu_to_le32(cons);
writeq(cq->db.raw, cq->db_addr);
-
- /* Make sure write would stick */
- mmiowb();
}
int qedr_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
@@ -2084,8 +2081,6 @@ static int qedr_update_qp_state(struct qedr_dev *dev,
if (rdma_protocol_roce(&dev->ibdev, 1)) {
writel(qp->rq.db_data.raw, qp->rq.db);
- /* Make sure write takes effect */
- mmiowb();
}
break;
case QED_ROCE_QP_STATE_ERR:
@@ -3502,9 +3497,6 @@ int qedr_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
smp_wmb();
writel(qp->sq.db_data.raw, qp->sq.db);
- /* Make sure write sticks */
- mmiowb();
-
spin_unlock_irqrestore(&qp->q_lock, flags);
return rc;
@@ -3695,12 +3687,8 @@ int qedr_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
writel(qp->rq.db_data.raw, qp->rq.db);
- /* Make sure write sticks */
- mmiowb();
-
if (rdma_protocol_iwarp(&dev->ibdev, 1)) {
writel(qp->rq.iwarp_db2_data.raw, qp->rq.iwarp_db2);
- mmiowb(); /* for second doorbell */
}
wr = wr->next;
diff --git a/drivers/infiniband/hw/qib/qib_iba6120.c b/drivers/infiniband/hw/qib/qib_iba6120.c
index cdbf707fa267..531d8a1db2c3 100644
--- a/drivers/infiniband/hw/qib/qib_iba6120.c
+++ b/drivers/infiniband/hw/qib/qib_iba6120.c
@@ -1884,7 +1884,6 @@ static void qib_6120_put_tid(struct qib_devdata *dd, u64 __iomem *tidptr,
qib_write_kreg(dd, kr_scratch, 0xfeeddeaf);
writel(pa, tidp32);
qib_write_kreg(dd, kr_scratch, 0xdeadbeef);
- mmiowb();
spin_unlock_irqrestore(tidlockp, flags);
}
@@ -1928,7 +1927,6 @@ static void qib_6120_put_tid_2(struct qib_devdata *dd, u64 __iomem *tidptr,
pa |= 2 << 29;
}
writel(pa, tidp32);
- mmiowb();
}
@@ -2053,9 +2051,7 @@ static void qib_update_6120_usrhead(struct qib_ctxtdata *rcd, u64 hd,
{
if (updegr)
qib_write_ureg(rcd->dd, ur_rcvegrindexhead, egrhd, rcd->ctxt);
- mmiowb();
qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt);
- mmiowb();
}
static u32 qib_6120_hdrqempty(struct qib_ctxtdata *rcd)
diff --git a/drivers/infiniband/hw/qib/qib_iba7220.c b/drivers/infiniband/hw/qib/qib_iba7220.c
index 9fde45538f6e..ea3ddb05cbad 100644
--- a/drivers/infiniband/hw/qib/qib_iba7220.c
+++ b/drivers/infiniband/hw/qib/qib_iba7220.c
@@ -2175,7 +2175,6 @@ static void qib_7220_put_tid(struct qib_devdata *dd, u64 __iomem *tidptr,
pa = chippa;
}
writeq(pa, tidptr);
- mmiowb();
}
/**
@@ -2704,9 +2703,7 @@ static void qib_update_7220_usrhead(struct qib_ctxtdata *rcd, u64 hd,
{
if (updegr)
qib_write_ureg(rcd->dd, ur_rcvegrindexhead, egrhd, rcd->ctxt);
- mmiowb();
qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt);
- mmiowb();
}
static u32 qib_7220_hdrqempty(struct qib_ctxtdata *rcd)
diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
index 17d6b24b3473..ac6a84f11ad0 100644
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -3793,7 +3793,6 @@ static void qib_7322_put_tid(struct qib_devdata *dd, u64 __iomem *tidptr,
pa = chippa;
}
writeq(pa, tidptr);
- mmiowb();
}
/**
@@ -4440,10 +4439,8 @@ static void qib_update_7322_usrhead(struct qib_ctxtdata *rcd, u64 hd,
adjust_rcv_timeout(rcd, npkts);
if (updegr)
qib_write_ureg(rcd->dd, ur_rcvegrindexhead, egrhd, rcd->ctxt);
- mmiowb();
qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt);
qib_write_ureg(rcd->dd, ur_rcvhdrhead, hd, rcd->ctxt);
- mmiowb();
}
static u32 qib_7322_hdrqempty(struct qib_ctxtdata *rcd)
diff --git a/drivers/infiniband/hw/qib/qib_sd7220.c b/drivers/infiniband/hw/qib/qib_sd7220.c
index 12caf3db8c34..4f4a09c2dbcd 100644
--- a/drivers/infiniband/hw/qib/qib_sd7220.c
+++ b/drivers/infiniband/hw/qib/qib_sd7220.c
@@ -1068,7 +1068,6 @@ static int qib_sd_setvals(struct qib_devdata *dd)
for (idx = 0; idx < NUM_DDS_REGS; ++idx) {
data = ((dds_reg_map & 0xF) << 4) | TX_FAST_ELT;
writeq(data, iaddr + idx);
- mmiowb();
qib_read_kreg32(dd, kr_scratch);
dds_reg_map >>= 4;
for (midx = 0; midx < DDS_ROWS; ++midx) {
@@ -1076,7 +1075,6 @@ static int qib_sd_setvals(struct qib_devdata *dd)
data = dds_init_vals[midx].reg_vals[idx];
writeq(data, daddr);
- mmiowb();
qib_read_kreg32(dd, kr_scratch);
} /* End inner for (vals for this reg, each row) */
} /* end outer for (regs to be stored) */
@@ -1098,13 +1096,11 @@ static int qib_sd_setvals(struct qib_devdata *dd)
didx = idx + min_idx;
/* Store the next RXEQ register address */
writeq(rxeq_init_vals[idx].rdesc, iaddr + didx);
- mmiowb();
qib_read_kreg32(dd, kr_scratch);
/* Iterate through RXEQ values */
for (vidx = 0; vidx < 4; vidx++) {
data = rxeq_init_vals[idx].rdata[vidx];
writeq(data, taddr + (vidx << 6) + idx);
- mmiowb();
qib_read_kreg32(dd, kr_scratch);
}
} /* end outer for (Reg-writes for RXEQ) */
diff --git a/drivers/media/pci/dt3155/dt3155.c b/drivers/media/pci/dt3155/dt3155.c
index 17d69bd5d7f1..49677ee889e3 100644
--- a/drivers/media/pci/dt3155/dt3155.c
+++ b/drivers/media/pci/dt3155/dt3155.c
@@ -46,7 +46,6 @@ static int read_i2c_reg(void __iomem *addr, u8 index, u8 *data)
u32 tmp = index;
iowrite32((tmp << 17) | IIC_READ, addr + IIC_CSR2);
- mmiowb();
udelay(45); /* wait at least 43 usec for NEW_CYCLE to clear */
if (ioread32(addr + IIC_CSR2) & NEW_CYCLE)
return -EIO; /* error: NEW_CYCLE not cleared */
@@ -77,7 +76,6 @@ static int write_i2c_reg(void __iomem *addr, u8 index, u8 data)
u32 tmp = index;
iowrite32((tmp << 17) | IIC_WRITE | data, addr + IIC_CSR2);
- mmiowb();
udelay(65); /* wait at least 63 usec for NEW_CYCLE to clear */
if (ioread32(addr + IIC_CSR2) & NEW_CYCLE)
return -EIO; /* error: NEW_CYCLE not cleared */
@@ -104,7 +102,6 @@ static void write_i2c_reg_nowait(void __iomem *addr, u8 index, u8 data)
u32 tmp = index;
iowrite32((tmp << 17) | IIC_WRITE | data, addr + IIC_CSR2);
- mmiowb();
}
/**
@@ -264,7 +261,6 @@ static irqreturn_t dt3155_irq_handler_even(int irq, void *dev_id)
FLD_DN_ODD | FLD_DN_EVEN |
CAP_CONT_EVEN | CAP_CONT_ODD,
ipd->regs + CSR1);
- mmiowb();
}
spin_lock(&ipd->lock);
@@ -282,7 +278,6 @@ static irqreturn_t dt3155_irq_handler_even(int irq, void *dev_id)
iowrite32(dma_addr + ipd->width, ipd->regs + ODD_DMA_START);
iowrite32(ipd->width, ipd->regs + EVEN_DMA_STRIDE);
iowrite32(ipd->width, ipd->regs + ODD_DMA_STRIDE);
- mmiowb();
}
/* enable interrupts, clear all irq flags */
@@ -437,12 +432,10 @@ static int dt3155_init_board(struct dt3155_priv *pd)
/* resetting the adapter */
iowrite32(ADDR_ERR_ODD | ADDR_ERR_EVEN | FLD_CRPT_ODD | FLD_CRPT_EVEN |
FLD_DN_ODD | FLD_DN_EVEN, pd->regs + CSR1);
- mmiowb();
msleep(20);
/* initializing adapter registers */
iowrite32(FIFO_EN | SRST, pd->regs + CSR1);
- mmiowb();
iowrite32(0xEEEEEE01, pd->regs + EVEN_PIXEL_FMT);
iowrite32(0xEEEEEE01, pd->regs + ODD_PIXEL_FMT);
iowrite32(0x00000020, pd->regs + FIFO_TRIGER);
@@ -454,7 +447,6 @@ static int dt3155_init_board(struct dt3155_priv *pd)
iowrite32(0, pd->regs + MASK_LENGTH);
iowrite32(0x0005007C, pd->regs + FIFO_FLAG_CNT);
iowrite32(0x01010101, pd->regs + IIC_CLK_DUR);
- mmiowb();
/* verifying that we have a DT3155 board (not just a SAA7116 chip) */
read_i2c_reg(pd->regs, DT_ID, &tmp);
diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
index bcdca9fbef51..e3a5af65dbce 100644
--- a/drivers/memstick/host/jmb38x_ms.c
+++ b/drivers/memstick/host/jmb38x_ms.c
@@ -644,7 +644,6 @@ static int jmb38x_ms_reset(struct jmb38x_ms_host *host)
writel(HOST_CONTROL_RESET_REQ | HOST_CONTROL_CLOCK_EN
| readl(host->addr + HOST_CONTROL),
host->addr + HOST_CONTROL);
- mmiowb();
for (cnt = 0; cnt < 20; ++cnt) {
if (!(HOST_CONTROL_RESET_REQ
@@ -659,7 +658,6 @@ reset_next:
writel(HOST_CONTROL_RESET | HOST_CONTROL_CLOCK_EN
| readl(host->addr + HOST_CONTROL),
host->addr + HOST_CONTROL);
- mmiowb();
for (cnt = 0; cnt < 20; ++cnt) {
if (!(HOST_CONTROL_RESET
@@ -672,7 +670,6 @@ reset_next:
return -EIO;
reset_ok:
- mmiowb();
writel(INT_STATUS_ALL, host->addr + INT_SIGNAL_ENABLE);
writel(INT_STATUS_ALL, host->addr + INT_STATUS_ENABLE);
return 0;
@@ -1009,7 +1006,6 @@ static void jmb38x_ms_remove(struct pci_dev *dev)
tasklet_kill(&host->notify);
writel(0, host->addr + INT_SIGNAL_ENABLE);
writel(0, host->addr + INT_STATUS_ENABLE);
- mmiowb();
dev_dbg(&jm->pdev->dev, "interrupts off\n");
spin_lock_irqsave(&host->lock, flags);
if (host->req) {
diff --git a/drivers/misc/ioc4.c b/drivers/misc/ioc4.c
index ec0832278170..9d0445a567db 100644
--- a/drivers/misc/ioc4.c
+++ b/drivers/misc/ioc4.c
@@ -156,7 +156,6 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd)
/* Reset to power-on state */
writel(0, &idd->idd_misc_regs->int_out.raw);
- mmiowb();
/* Set up square wave */
int_out.raw = 0;
@@ -164,7 +163,6 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd)
int_out.fields.mode = IOC4_INT_OUT_MODE_TOGGLE;
int_out.fields.diag = 0;
writel(int_out.raw, &idd->idd_misc_regs->int_out.raw);
- mmiowb();
/* Check square wave period averaged over some number of cycles */
start = ktime_get_ns();
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 3fbbadfa2ae1..8a47a6fc3fc7 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -350,9 +350,6 @@ static void mei_me_hw_reset_release(struct mei_device *dev)
hcsr |= H_IG;
hcsr &= ~H_RST;
mei_hcsr_set(dev, hcsr);
-
- /* complete this write before we set host ready on another CPU */
- mmiowb();
}
/**
diff --git a/drivers/misc/tifm_7xx1.c b/drivers/misc/tifm_7xx1.c
index 9ac95b48ef92..cc729f7ab32e 100644
--- a/drivers/misc/tifm_7xx1.c
+++ b/drivers/misc/tifm_7xx1.c
@@ -403,7 +403,6 @@ static void tifm_7xx1_remove(struct pci_dev *dev)
fm->eject = tifm_7xx1_dummy_eject;
fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif;
writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
- mmiowb();
free_irq(dev->irq, fm);
tifm_remove_adapter(fm);
diff --git a/drivers/mmc/host/alcor.c b/drivers/mmc/host/alcor.c
index 7c8f203f9a24..6e6b7ade4b60 100644
--- a/drivers/mmc/host/alcor.c
+++ b/drivers/mmc/host/alcor.c
@@ -959,7 +959,6 @@ static void alcor_timeout_timer(struct work_struct *work)
alcor_request_complete(host, 0);
}
- mmiowb();
mutex_unlock(&host->cmd_mutex);
}
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a8141ff9be03..42e1bad024f4 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1807,7 +1807,6 @@ void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
sdhci_send_command(host, mrq->cmd);
}
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
EXPORT_SYMBOL_GPL(sdhci_request);
@@ -2010,8 +2009,6 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
*/
if (host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
sdhci_do_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
-
- mmiowb();
}
EXPORT_SYMBOL_GPL(sdhci_set_ios);
@@ -2105,7 +2102,6 @@ static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
- mmiowb();
}
}
@@ -2353,7 +2349,6 @@ void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
host->tuning_done = 0;
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
/* Wait for Buffer Read Ready interrupt */
@@ -2705,7 +2700,6 @@ static bool sdhci_request_done(struct sdhci_host *host)
host->mrqs_done[i] = NULL;
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
mmc_request_done(host->mmc, mrq);
@@ -2739,7 +2733,6 @@ static void sdhci_timeout_timer(struct timer_list *t)
sdhci_finish_mrq(host, host->cmd->mrq);
}
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
@@ -2770,7 +2763,6 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
}
}
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
@@ -3251,7 +3243,6 @@ int sdhci_resume_host(struct sdhci_host *host)
mmc->ops->set_ios(mmc, &mmc->ios);
} else {
sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
- mmiowb();
}
if (host->irq_wake_enabled) {
@@ -3391,7 +3382,6 @@ void sdhci_cqe_enable(struct mmc_host *mmc)
mmc_hostname(mmc), host->ier,
sdhci_readl(host, SDHCI_INT_STATUS));
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
EXPORT_SYMBOL_GPL(sdhci_cqe_enable);
@@ -3416,7 +3406,6 @@ void sdhci_cqe_disable(struct mmc_host *mmc, bool recovery)
mmc_hostname(mmc), host->ier,
sdhci_readl(host, SDHCI_INT_STATUS));
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
EXPORT_SYMBOL_GPL(sdhci_cqe_disable);
@@ -4255,8 +4244,6 @@ int __sdhci_add_host(struct sdhci_host *host)
goto unirq;
}
- mmiowb();
-
ret = mmc_add_host(mmc);
if (ret)
goto unled;
diff --git a/drivers/mmc/host/tifm_sd.c b/drivers/mmc/host/tifm_sd.c
index b6644ce296b2..35dd34b82a4d 100644
--- a/drivers/mmc/host/tifm_sd.c
+++ b/drivers/mmc/host/tifm_sd.c
@@ -889,7 +889,6 @@ static int tifm_sd_initialize_host(struct tifm_sd *host)
struct tifm_dev *sock = host->dev;
writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
- mmiowb();
host->clk_div = 61;
host->clk_freq = 20000000;
writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL);
@@ -940,7 +939,6 @@ static int tifm_sd_initialize_host(struct tifm_sd *host)
writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC
| TIFM_MMCSD_ERRMASK,
sock->addr + SOCK_MMCSD_INT_ENABLE);
- mmiowb();
return 0;
}
@@ -1005,7 +1003,6 @@ static void tifm_sd_remove(struct tifm_dev *sock)
spin_lock_irqsave(&sock->lock, flags);
host->eject = 1;
writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE);
- mmiowb();
spin_unlock_irqrestore(&sock->lock, flags);
tasklet_kill(&host->finish_tasklet);
diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c
index 32c4211506fc..412395ac2935 100644
--- a/drivers/mmc/host/via-sdmmc.c
+++ b/drivers/mmc/host/via-sdmmc.c
@@ -686,7 +686,6 @@ static void via_sdc_request(struct mmc_host *mmc, struct mmc_request *mrq)
via_sdc_send_command(host, mrq->cmd);
}
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
@@ -711,7 +710,6 @@ static void via_sdc_set_power(struct via_crdr_mmc_host *host,
gatt &= ~VIA_CRDR_PCICLKGATT_PAD_PWRON;
writeb(gatt, host->pcictrl_mmiobase + VIA_CRDR_PCICLKGATT);
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
via_pwron_sleep(host);
@@ -770,7 +768,6 @@ static void via_sdc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (readb(addrbase + VIA_CRDR_PCISDCCLK) != clock)
writeb(clock, addrbase + VIA_CRDR_PCISDCCLK);
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
if (ios->power_mode != MMC_POWER_OFF)
@@ -830,7 +827,6 @@ static void via_reset_pcictrl(struct via_crdr_mmc_host *host)
via_restore_pcictrlreg(host);
via_restore_sdcreg(host);
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
}
@@ -925,7 +921,6 @@ static irqreturn_t via_sdc_isr(int irq, void *dev_id)
result = IRQ_HANDLED;
- mmiowb();
out:
spin_unlock(&sdhost->lock);
@@ -960,7 +955,6 @@ static void via_sdc_timeout(struct timer_list *t)
}
}
- mmiowb();
spin_unlock_irqrestore(&sdhost->lock, flags);
}
@@ -1012,7 +1006,6 @@ static void via_sdc_card_detect(struct work_struct *work)
tasklet_schedule(&host->finish_tasklet);
}
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
via_reset_pcictrl(host);
@@ -1020,7 +1013,6 @@ static void via_sdc_card_detect(struct work_struct *work)
spin_lock_irqsave(&host->lock, flags);
}
- mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
via_print_pcictrl(host);
@@ -1188,7 +1180,6 @@ static void via_sd_remove(struct pci_dev *pcidev)
/* Disable generating further interrupts */
writeb(0x0, sdhost->pcictrl_mmiobase + VIA_CRDR_PCIINTCTRL);
- mmiowb();
if (sdhost->mrq) {
pr_err("%s: Controller removed during "
@@ -1197,7 +1188,6 @@ static void via_sd_remove(struct pci_dev *pcidev)
/* make sure all DMA is stopped */
writel(VIA_CRDR_DMACTRL_SFTRST,
sdhost->ddma_mmiobase + VIA_CRDR_DMACTRL);
- mmiowb();
sdhost->mrq->cmd->error = -ENOMEDIUM;
if (sdhost->mrq->stop)
sdhost->mrq->stop->error = -ENOMEDIUM;
diff --git a/drivers/mtd/nand/raw/r852.c b/drivers/mtd/nand/raw/r852.c
index 86456216fb93..7b99831aa046 100644
--- a/drivers/mtd/nand/raw/r852.c
+++ b/drivers/mtd/nand/raw/r852.c
@@ -45,7 +45,6 @@ static inline void r852_write_reg(struct r852_device *dev,
int address, uint8_t value)
{
writeb(value, dev->mmio + address);
- mmiowb();
}
@@ -61,7 +60,6 @@ static inline void r852_write_reg_dword(struct r852_device *dev,
int address, uint32_t value)
{
writel(cpu_to_le32(value), dev->mmio + address);
- mmiowb();
}
/* returns pointer to our private structure */
diff --git a/drivers/mtd/nand/raw/txx9ndfmc.c b/drivers/mtd/nand/raw/txx9ndfmc.c
index ddf0420c0997..97978227aa55 100644
--- a/drivers/mtd/nand/raw/txx9ndfmc.c
+++ b/drivers/mtd/nand/raw/txx9ndfmc.c
@@ -159,7 +159,6 @@ static void txx9ndfmc_cmd_ctrl(struct nand_chip *chip, int cmd,
if ((ctrl & NAND_CTRL_CHANGE) && cmd == NAND_CMD_NONE)
txx9ndfmc_write(dev, 0, TXX9_NDFDTR);
}
- mmiowb();
}
static int txx9ndfmc_dev_ready(struct nand_chip *chip)
diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c
index 47e5984f16fb..3155f7fa83eb 100644
--- a/drivers/net/ethernet/aeroflex/greth.c
+++ b/drivers/net/ethernet/aeroflex/greth.c
@@ -613,7 +613,6 @@ static irqreturn_t greth_interrupt(int irq, void *dev_id)
napi_schedule(&greth->napi);
}
- mmiowb();
spin_unlock(&greth->devlock);
return retval;
diff --git a/drivers/net/ethernet/alacritech/slicoss.c b/drivers/net/ethernet/alacritech/slicoss.c
index 16477aa6d61f..4f7e792e50e9 100644
--- a/drivers/net/ethernet/alacritech/slicoss.c
+++ b/drivers/net/ethernet/alacritech/slicoss.c
@@ -345,8 +345,6 @@ static void slic_set_rx_mode(struct net_device *dev)
if (sdev->promisc != set_promisc) {
sdev->promisc = set_promisc;
slic_configure_rcv(sdev);
- /* make sure writes to receiver cant leak out of the lock */
- mmiowb();
}
spin_unlock_bh(&sdev->link_lock);
}
@@ -1461,8 +1459,6 @@ static netdev_tx_t slic_xmit(struct sk_buff *skb, struct net_device *dev)
if (slic_get_free_tx_descs(txq) < SLIC_MAX_REQ_TX_DESCS)
netif_stop_queue(dev);
- /* make sure writes to io-memory cant leak out of tx queue lock */
- mmiowb();
return NETDEV_TX_OK;
drop_skb:
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index b17d435de09f..05798aa5bb73 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -2016,7 +2016,6 @@ void ena_com_aenq_intr_handler(struct ena_com_dev *dev, void *data)
mb();
writel_relaxed((u32)aenq->head,
dev->reg_bar + ENA_REGS_AENQ_HEAD_DB_OFF);
- mmiowb();
}
int ena_com_dev_reset(struct ena_com_dev *ena_dev,
diff --git a/drivers/net/ethernet/atheros/atlx/atl1.c b/drivers/net/ethernet/atheros/atlx/atl1.c
index 156fbc5601ca..f35c9a75be50 100644
--- a/drivers/net/ethernet/atheros/atlx/atl1.c
+++ b/drivers/net/ethernet/atheros/atlx/atl1.c
@@ -2439,7 +2439,6 @@ static netdev_tx_t atl1_xmit_frame(struct sk_buff *skb,
atl1_tx_map(adapter, skb, ptpd);
atl1_tx_queue(adapter, count, ptpd);
atl1_update_mailbox(adapter);
- mmiowb();
return NETDEV_TX_OK;
}
diff --git a/drivers/net/ethernet/atheros/atlx/atl2.c b/drivers/net/ethernet/atheros/atlx/atl2.c
index 98da0fa27192..dd81c5863111 100644
--- a/drivers/net/ethernet/atheros/atlx/atl2.c
+++ b/drivers/net/ethernet/atheros/atlx/atl2.c
@@ -908,7 +908,6 @@ static netdev_tx_t atl2_xmit_frame(struct sk_buff *skb,
ATL2_WRITE_REGW(&adapter->hw, REG_MB_TXD_WR_IDX,
(adapter->txd_write_ptr >> 2));
- mmiowb();
dev_consume_skb_any(skb);
return NETDEV_TX_OK;
}
diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index d63371d70bce..dfdd14eadd57 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -3305,8 +3305,6 @@ next_rx:
BNX2_WR(bp, rxr->rx_bseq_addr, rxr->rx_prod_bseq);
- mmiowb();
-
return rx_pkt;
}
@@ -6723,8 +6721,6 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
BNX2_WR16(bp, txr->tx_bidx_addr, prod);
BNX2_WR(bp, txr->tx_bseq_addr, txr->tx_prod_bseq);
- mmiowb();
-
txr->tx_prod = prod;
if (unlikely(bnx2_tx_avail(bp, txr) <= MAX_SKB_FRAGS)) {
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index ecb1bd7eb508..0c8f5b546c6f 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -4166,8 +4166,6 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
DOORBELL_RELAXED(bp, txdata->cid, txdata->tx_db.raw);
- mmiowb();
-
txdata->tx_bd_prod += nbd;
if (unlikely(bnx2x_tx_avail(bp, txdata) < MAX_DESC_PER_TX_PKT)) {
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
index 2462e7aa0c5d..2d57af9c061c 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
@@ -527,8 +527,6 @@ static inline void bnx2x_update_rx_prod(struct bnx2x *bp,
REG_WR_RELAXED(bp, fp->ustorm_rx_prods_offset + i * 4,
((u32 *)&rx_prods)[i]);
- mmiowb(); /* keep prod updates ordered */
-
DP(NETIF_MSG_RX_STATUS,
"queue[%d]: wrote bd_prod %u cqe_prod %u sge_prod %u\n",
fp->index, bd_prod, rx_comp_prod, rx_sge_prod);
@@ -653,7 +651,6 @@ static inline void bnx2x_igu_ack_sb_gen(struct bnx2x *bp, u8 igu_sb_id,
REG_WR(bp, igu_addr, cmd_data.sb_id_and_flags);
/* Make sure that ACK is written */
- mmiowb();
barrier();
}
@@ -674,7 +671,6 @@ static inline void bnx2x_hc_ack_sb(struct bnx2x *bp, u8 sb_id,
REG_WR(bp, hc_addr, (*(u32 *)&igu_ack));
/* Make sure that ACK is written */
- mmiowb();
barrier();
}
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
index 749d0ef44371..0745cccd416d 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
@@ -2623,7 +2623,6 @@ static int bnx2x_run_loopback(struct bnx2x *bp, int loopback_mode)
wmb();
DOORBELL_RELAXED(bp, txdata->cid, txdata->tx_db.raw);
- mmiowb();
barrier();
num_pkts++;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 626b491f7674..3716c828ff5d 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -869,9 +869,6 @@ static void bnx2x_hc_int_disable(struct bnx2x *bp)
"write %x to HC %d (addr 0x%x)\n",
val, port, addr);
- /* flush all outstanding writes */
- mmiowb();
-
REG_WR(bp, addr, val);
if (REG_RD(bp, addr) != val)
BNX2X_ERR("BUG! Proper val not read from IGU!\n");
@@ -887,9 +884,6 @@ static void bnx2x_igu_int_disable(struct bnx2x *bp)
DP(NETIF_MSG_IFDOWN, "write %x to IGU\n", val);
- /* flush all outstanding writes */
- mmiowb();
-
REG_WR(bp, IGU_REG_PF_CONFIGURATION, val);
if (REG_RD(bp, IGU_REG_PF_CONFIGURATION) != val)
BNX2X_ERR("BUG! Proper val not read from IGU!\n");
@@ -1595,7 +1589,6 @@ static void bnx2x_hc_int_enable(struct bnx2x *bp)
/*
* Ensure that HC_CONFIG is written before leading/trailing edge config
*/
- mmiowb();
barrier();
if (!CHIP_IS_E1(bp)) {
@@ -1611,9 +1604,6 @@ static void bnx2x_hc_int_enable(struct bnx2x *bp)
REG_WR(bp, HC_REG_TRAILING_EDGE_0 + port*8, val);
REG_WR(bp, HC_REG_LEADING_EDGE_0 + port*8, val);
}
-
- /* Make sure that interrupts are indeed enabled from here on */
- mmiowb();
}
static void bnx2x_igu_int_enable(struct bnx2x *bp)
@@ -1674,9 +1664,6 @@ static void bnx2x_igu_int_enable(struct bnx2x *bp)
REG_WR(bp, IGU_REG_TRAILING_EDGE_LATCH, val);
REG_WR(bp, IGU_REG_LEADING_EDGE_LATCH, val);
-
- /* Make sure that interrupts are indeed enabled from here on */
- mmiowb();
}
void bnx2x_int_enable(struct bnx2x *bp)
@@ -3833,7 +3820,6 @@ static void bnx2x_sp_prod_update(struct bnx2x *bp)
REG_WR16_RELAXED(bp, BAR_XSTRORM_INTMEM + XSTORM_SPQ_PROD_OFFSET(func),
bp->spq_prod_idx);
- mmiowb();
}
/**
@@ -5244,7 +5230,6 @@ static void bnx2x_update_eq_prod(struct bnx2x *bp, u16 prod)
{
/* No memory barriers */
storm_memset_eq_prod(bp, prod, BP_FUNC(bp));
- mmiowb(); /* keep prod updates ordered */
}
static int bnx2x_cnic_handle_cfc_del(struct bnx2x *bp, u32 cid,
@@ -6513,7 +6498,6 @@ void bnx2x_nic_init_cnic(struct bnx2x *bp)
/* flush all */
mb();
- mmiowb();
}
void bnx2x_pre_irq_nic_init(struct bnx2x *bp)
@@ -6553,7 +6537,6 @@ void bnx2x_post_irq_nic_init(struct bnx2x *bp, u32 load_code)
/* flush all before enabling interrupts */
mb();
- mmiowb();
bnx2x_int_enable(bp);
@@ -7775,12 +7758,10 @@ void bnx2x_igu_clear_sb_gen(struct bnx2x *bp, u8 func, u8 idu_sb_id, bool is_pf)
DP(NETIF_MSG_HW, "write 0x%08x to IGU(via GRC) addr 0x%x\n",
data, igu_addr_data);
REG_WR(bp, igu_addr_data, data);
- mmiowb();
barrier();
DP(NETIF_MSG_HW, "write 0x%08x to IGU(via GRC) addr 0x%x\n",
ctl, igu_addr_ctl);
REG_WR(bp, igu_addr_ctl, ctl);
- mmiowb();
barrier();
/* wait for clean up to finish */
@@ -9550,7 +9531,6 @@ static void bnx2x_set_234_gates(struct bnx2x *bp, bool close)
DP(NETIF_MSG_HW | NETIF_MSG_IFUP, "%s gates #2, #3 and #4\n",
close ? "closing" : "opening");
- mmiowb();
}
#define SHARED_MF_CLP_MAGIC 0x80000000 /* `magic' bit */
@@ -9674,7 +9654,6 @@ static void bnx2x_pxp_prep(struct bnx2x *bp)
if (!CHIP_IS_E1(bp)) {
REG_WR(bp, PXP2_REG_RD_START_INIT, 0);
REG_WR(bp, PXP2_REG_RQ_RBC_DONE, 0);
- mmiowb();
}
}
@@ -9774,16 +9753,13 @@ static void bnx2x_process_kill_chip_reset(struct bnx2x *bp, bool global)
reset_mask1 & (~not_reset_mask1));
barrier();
- mmiowb();
REG_WR(bp, GRCBASE_MISC + MISC_REGISTERS_RESET_REG_2_SET,
reset_mask2 & (~stay_reset2));
barrier();
- mmiowb();
REG_WR(bp, GRCBASE_MISC + MISC_REGISTERS_RESET_REG_1_SET, reset_mask1);
- mmiowb();
}
/**
@@ -9867,9 +9843,6 @@ static int bnx2x_process_kill(struct bnx2x *bp, bool global)
REG_WR(bp, MISC_REG_UNPREPARED, 0);
barrier();
- /* Make sure all is written to the chip before the reset */
- mmiowb();
-
/* Wait for 1ms to empty GLUE and PCI-E core queues,
* PSWHST, GRC and PSWRD Tetris buffer.
*/
@@ -14828,7 +14801,6 @@ static int bnx2x_drv_ctl(struct net_device *dev, struct drv_ctl_info *ctl)
if (rc)
break;
- mmiowb();
barrier();
/* Start accepting on iSCSI L2 ring */
@@ -14863,7 +14835,6 @@ static int bnx2x_drv_ctl(struct net_device *dev, struct drv_ctl_info *ctl)
if (!bnx2x_wait_sp_comp(bp, sp_bits))
BNX2X_ERR("rx_mode completion timed out!\n");
- mmiowb();
barrier();
/* Unset iSCSI L2 MAC */
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
index 7b22a6d8514c..80d250a6d048 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
@@ -5039,7 +5039,6 @@ static inline int bnx2x_q_init(struct bnx2x *bp,
/* As no ramrod is sent, complete the command immediately */
o->complete_cmd(bp, o, BNX2X_Q_CMD_INIT);
- mmiowb();
smp_mb();
return 0;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
index c97b642e6537..0edbb0a76847 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
@@ -100,13 +100,11 @@ static void bnx2x_vf_igu_ack_sb(struct bnx2x *bp, struct bnx2x_virtf *vf,
DP(NETIF_MSG_HW, "write 0x%08x to IGU(via GRC) addr 0x%x\n",
cmd_data.sb_id_and_flags, igu_addr_data);
REG_WR(bp, igu_addr_data, cmd_data.sb_id_and_flags);
- mmiowb();
barrier();
DP(NETIF_MSG_HW, "write 0x%08x to IGU(via GRC) addr 0x%x\n",
ctl, igu_addr_ctl);
REG_WR(bp, igu_addr_ctl, ctl);
- mmiowb();
barrier();
}
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
index 10ff37d6dc78..0752b7fa4d9c 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c
@@ -172,8 +172,6 @@ static int bnx2x_send_msg2pf(struct bnx2x *bp, u8 *done, dma_addr_t msg_mapping)
/* Trigger the PF FW */
writeb_relaxed(1, &zone_data->trigger.vf_pf_channel.addr_valid);
- mmiowb();
-
/* Wait for PF to complete */
while ((tout >= 0) && (!*done)) {
msleep(interval);
@@ -1179,7 +1177,6 @@ static void bnx2x_vf_mbx_resp_send_msg(struct bnx2x *bp,
/* ack the FW */
storm_memset_vf_mbx_ack(bp, vf->abs_vfid);
- mmiowb();
/* copy the response header including status-done field,
* must be last dmae, must be after FW is acked
@@ -2174,7 +2171,6 @@ static void bnx2x_vf_mbx_request(struct bnx2x *bp, struct bnx2x_virtf *vf,
*/
storm_memset_vf_mbx_ack(bp, vf->abs_vfid);
/* Firmware ack should be written before unlocking channel */
- mmiowb();
bnx2x_unlock_vf_pf_channel(bp, vf, mbx->first_tlv.tl.type);
}
}
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 52ade133b57c..2a4341708c0f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -556,8 +556,6 @@ normal_tx:
tx_done:
- mmiowb();
-
if (unlikely(bnxt_tx_avail(bp, txr) <= MAX_SKB_FRAGS + 1)) {
if (skb->xmit_more && !tx_buf->is_push)
bnxt_db_write(bp, &txr->tx_db, prod);
@@ -2134,7 +2132,6 @@ static int bnxt_poll(struct napi_struct *napi, int budget)
&dim_sample);
net_dim(&cpr->dim, dim_sample);
}
- mmiowb();
return work_done;
}
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 060a6f386104..2aebd4bbb67d 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -1073,7 +1073,6 @@ static void tg3_int_reenable(struct tg3_napi *tnapi)
struct tg3 *tp = tnapi->tp;
tw32_mailbox(tnapi->int_mbox, tnapi->last_tag << 24);
- mmiowb();
/* When doing tagged status, this work check is unnecessary.
* The last_tag we write above tells the chip which piece of
@@ -6999,7 +6998,6 @@ next_pkt_nopost:
tw32_rx_mbox(TG3_RX_JMB_PROD_IDX_REG,
tpr->rx_jmb_prod_idx);
}
- mmiowb();
} else if (work_mask) {
/* rx_std_buffers[] and rx_jmb_buffers[] entries must be
* updated before the producer indices can be updated.
@@ -7210,8 +7208,6 @@ static int tg3_poll_work(struct tg3_napi *tnapi, int work_done, int budget)
tw32_rx_mbox(TG3_RX_JMB_PROD_IDX_REG,
dpr->rx_jmb_prod_idx);
- mmiowb();
-
if (err)
tw32_f(HOSTCC_MODE, tp->coal_now);
}
@@ -7278,7 +7274,6 @@ static int tg3_poll_msix(struct napi_struct *napi, int budget)
HOSTCC_MODE_ENABLE |
tnapi->coal_now);
}
- mmiowb();
break;
}
}
@@ -8159,7 +8154,6 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (!skb->xmit_more || netif_xmit_stopped(txq)) {
/* Packets are ready, update Tx producer idx on card. */
tw32_tx_mbox(tnapi->prodmbox, entry);
- mmiowb();
}
return NETDEV_TX_OK;
diff --git a/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c b/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c
index 2df7440f58df..39643be8c30a 100644
--- a/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c
+++ b/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c
@@ -38,9 +38,6 @@ int lio_cn6xxx_soft_reset(struct octeon_device *oct)
lio_pci_readq(oct, CN6XXX_CIU_SOFT_RST);
lio_pci_writeq(oct, 1, CN6XXX_CIU_SOFT_RST);
- /* make sure that the reset is written before starting timer */
- mmiowb();
-
/* Wait for 10ms as Octeon resets. */
mdelay(100);
@@ -487,9 +484,6 @@ void lio_cn6xxx_disable_interrupt(struct octeon_device *oct,
/* Disable Interrupts */
writeq(0, cn6xxx->intr_enb_reg64);
-
- /* make sure interrupts are really disabled */
- mmiowb();
}
static void lio_cn6xxx_get_pcie_qlmport(struct octeon_device *oct)
@@ -555,10 +549,6 @@ static int lio_cn6xxx_process_droq_intr_regs(struct octeon_device *oct)
value &= ~(1 << oq_no);
octeon_write_csr(oct, reg, value);
- /* Ensure that the enable register is written.
- */
- mmiowb();
-
spin_unlock(&cn6xxx->lock_for_droq_int_enb_reg);
}
}
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_device.c b/drivers/net/ethernet/cavium/liquidio/octeon_device.c
index ce8c3f818666..934115d18488 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_device.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_device.c
@@ -1449,7 +1449,6 @@ void lio_enable_irq(struct octeon_droq *droq, struct octeon_instr_queue *iq)
iq->pkt_in_done -= iq->pkts_processed;
iq->pkts_processed = 0;
/* this write needs to be flushed before we release the lock */
- mmiowb();
spin_unlock_bh(&iq->lock);
oct = iq->oct_dev;
}
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
index a0c099f71524..017169023cca 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c
@@ -513,8 +513,6 @@ int octeon_retry_droq_refill(struct octeon_droq *droq)
*/
wmb();
writel(desc_refilled, droq->pkts_credit_reg);
- /* make sure mmio write completes */
- mmiowb();
if (pkts_credit + desc_refilled >= CN23XX_SLI_DEF_BP)
reschedule = 0;
@@ -712,8 +710,6 @@ octeon_droq_fast_process_packets(struct octeon_device *oct,
*/
wmb();
writel(desc_refilled, droq->pkts_credit_reg);
- /* make sure mmio write completes */
- mmiowb();
}
}
} /* for (each packet)... */
diff --git a/drivers/net/ethernet/cavium/liquidio/request_manager.c b/drivers/net/ethernet/cavium/liquidio/request_manager.c
index c6f4cbda040f..fcf20a8f92d9 100644
--- a/drivers/net/ethernet/cavium/liquidio/request_manager.c
+++ b/drivers/net/ethernet/cavium/liquidio/request_manager.c
@@ -278,7 +278,6 @@ ring_doorbell(struct octeon_device *oct, struct octeon_instr_queue *iq)
if (atomic_read(&oct->status) == OCT_DEV_RUNNING) {
writel(iq->fill_cnt, iq->doorbell_reg);
/* make sure doorbell write goes through */
- mmiowb();
iq->fill_cnt = 0;
iq->last_db_time = jiffies;
return;
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 8fe9af0e2ab7..466bf1ea186d 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -3270,11 +3270,6 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
if (!skb->xmit_more ||
netif_xmit_stopped(netdev_get_tx_queue(netdev, 0))) {
writel(tx_ring->next_to_use, hw->hw_addr + tx_ring->tdt);
- /* we need this if more than one processor can write to
- * our tail at a time, it synchronizes IO on IA64/Altix
- * systems
- */
- mmiowb();
}
} else {
dev_kfree_skb_any(skb);
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 7acc61e4f645..022c3ac0e40f 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3816,7 +3816,6 @@ static void e1000_flush_tx_ring(struct e1000_adapter *adapter)
if (tx_ring->next_to_use == tx_ring->count)
tx_ring->next_to_use = 0;
ew32(TDT(0), tx_ring->next_to_use);
- mmiowb();
usleep_range(200, 250);
}
@@ -5904,12 +5903,6 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
tx_ring->next_to_use);
else
writel(tx_ring->next_to_use, tx_ring->tail);
-
- /* we need this if more than one processor can write
- * to our tail at a time, it synchronizes IO on
- *IA64/Altix systems
- */
- mmiowb();
}
} else {
dev_kfree_skb_any(skb);
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_iov.c b/drivers/net/ethernet/intel/fm10k/fm10k_iov.c
index 5d4f1761dc0c..8de77155f2e7 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_iov.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_iov.c
@@ -321,8 +321,6 @@ static void fm10k_mask_aer_comp_abort(struct pci_dev *pdev)
pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_MASK, &err_mask);
err_mask |= PCI_ERR_UNC_COMP_ABORT;
pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_MASK, err_mask);
-
- mmiowb();
}
int fm10k_iov_resume(struct pci_dev *pdev)
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
index ecef949f3baa..cbf76a96e94e 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
@@ -1039,11 +1039,6 @@ static void fm10k_tx_map(struct fm10k_ring *tx_ring,
/* notify HW of packet */
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 6c97667d20ef..ffb611bbedfa 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -3471,11 +3471,6 @@ static inline int i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb,
/* notify HW of packet */
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return 0;
diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index 9b4d7cec2e18..6bfef82e7607 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -2360,11 +2360,6 @@ static inline void iavf_tx_map(struct iavf_ring *tx_ring, struct sk_buff *skb,
/* notify HW of packet */
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index c289d97f477d..1af21bbe180e 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1356,11 +1356,6 @@ ice_tx_map(struct ice_ring *tx_ring, struct ice_tx_buf *first,
/* notify HW of packet */
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return;
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 3269d8e94744..1d71ec360b1c 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6028,11 +6028,6 @@ static int igb_tx_map(struct igb_ring *tx_ring,
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return 0;
diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index 4eab83faec62..34cd30d7162f 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2279,10 +2279,6 @@ static inline void igbvf_tx_queue_adv(struct igbvf_adapter *adapter,
tx_ring->buffer_info[first].next_to_watch = tx_desc;
tx_ring->next_to_use = i;
writel(i, adapter->hw.hw_addr + tx_ring->tail);
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 87a11879bf2d..f8d692f6aa4f 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -892,11 +892,6 @@ static int igc_tx_map(struct igc_ring *tx_ring,
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return 0;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index e100054a3765..99e23cf6a73a 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8299,11 +8299,6 @@ static int ixgbe_tx_map(struct ixgbe_ring *tx_ring,
if (netif_xmit_stopped(txring_txq(tx_ring)) || !skb->xmit_more) {
writel(i, tx_ring->tail);
-
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
}
return 0;
diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
index 8b3495ee2b6e..49486c10ef81 100644
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -1139,9 +1139,6 @@ static inline void sky2_put_idx(struct sky2_hw *hw, unsigned q, u16 idx)
/* Make sure write' to descriptors are complete before we tell hardware */
wmb();
sky2_write16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX), idx);
-
- /* Synchronize I/O on since next processor may write to tail */
- mmiowb();
}
@@ -1354,7 +1351,6 @@ stopped:
/* reset the Rx prefetch unit */
sky2_write32(hw, Y2_QADDR(rxq, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);
- mmiowb();
}
/* Clean out receive buffer area, assumes receiver hardware stopped */
diff --git a/drivers/net/ethernet/mellanox/mlx4/catas.c b/drivers/net/ethernet/mellanox/mlx4/catas.c
index c81d15bf259c..87e90b5d4d7d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/catas.c
+++ b/drivers/net/ethernet/mellanox/mlx4/catas.c
@@ -129,10 +129,6 @@ static int mlx4_reset_slave(struct mlx4_dev *dev)
comm_flags = rst_req << COM_CHAN_RST_REQ_OFFSET;
__raw_writel((__force u32)cpu_to_be32(comm_flags),
(__iomem char *)priv->mfunc.comm + MLX4_COMM_CHAN_FLAGS);
- /* Make sure that our comm channel write doesn't
- * get mixed in with writes from another CPU.
- */
- mmiowb();
end = msecs_to_jiffies(MLX4_COMM_TIME) + jiffies;
while (time_before(jiffies, end)) {
diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
index a5d5d6fc1da0..c678344d22a2 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
@@ -281,7 +281,6 @@ static int mlx4_comm_cmd_post(struct mlx4_dev *dev, u8 cmd, u16 param)
val = param | (cmd << 16) | (priv->cmd.comm_toggle << 31);
__raw_writel((__force u32) cpu_to_be32(val),
&priv->mfunc.comm->slave_write);
- mmiowb();
mutex_unlock(&dev->persist->device_state_mutex);
return 0;
}
@@ -496,12 +495,6 @@ static int mlx4_cmd_post(struct mlx4_dev *dev, u64 in_param, u64 out_param,
(op_modifier << HCR_OPMOD_SHIFT) |
op), hcr + 6);
- /*
- * Make sure that our HCR writes don't get mixed in with
- * writes from another CPU starting a FW command.
- */
- mmiowb();
-
cmd->toggle = cmd->toggle ^ 1;
ret = 0;
@@ -2206,7 +2199,6 @@ static void mlx4_master_do_cmd(struct mlx4_dev *dev, int slave, u8 cmd,
}
__raw_writel((__force u32) cpu_to_be32(reply),
&priv->mfunc.comm[slave].slave_read);
- mmiowb();
return;
@@ -2410,7 +2402,6 @@ int mlx4_multi_func_init(struct mlx4_dev *dev)
&priv->mfunc.comm[i].slave_write);
__raw_writel((__force u32) 0,
&priv->mfunc.comm[i].slave_read);
- mmiowb();
for (port = 1; port <= MLX4_MAX_PORTS; port++) {
struct mlx4_vport_state *admin_vport;
struct mlx4_vport_state *oper_vport;
@@ -2576,10 +2567,6 @@ void mlx4_report_internal_err_comm_event(struct mlx4_dev *dev)
slave_read |= (u32)COMM_CHAN_EVENT_INTERNAL_ERR;
__raw_writel((__force u32)cpu_to_be32(slave_read),
&priv->mfunc.comm[slave].slave_read);
- /* Make sure that our comm channel write doesn't
- * get mixed in with writes from another CPU.
- */
- mmiowb();
}
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index be48c6440251..c087d1014b09 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -917,7 +917,6 @@ static void cmd_work_handler(struct work_struct *work)
mlx5_core_dbg(dev, "writing 0x%x to command doorbell\n", 1 << ent->idx);
wmb();
iowrite32be(1 << ent->idx, &dev->iseg->cmd_dbell);
- mmiowb();
/* if not in polling don't use ent after this point */
if (cmd_mode == CMD_MODE_POLLING || poll_cmd) {
poll_timeout(ent);
diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
index e0340f778d8f..d8b7fba96d58 100644
--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
@@ -1439,7 +1439,6 @@ myri10ge_tx_done(struct myri10ge_slice_state *ss, int mcp_index)
tx->queue_active = 0;
put_be32(htonl(1), tx->send_stop);
mb();
- mmiowb();
}
__netif_tx_unlock(dev_queue);
}
@@ -2861,7 +2860,6 @@ again:
tx->queue_active = 1;
put_be32(htonl(1), tx->send_go);
mb();
- mmiowb();
}
tx->pkt_start++;
if ((avail - count) < MXGEFW_MAX_SEND_DESC) {
diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c
index feda9644289d..3b2ae1a21678 100644
--- a/drivers/net/ethernet/neterion/s2io.c
+++ b/drivers/net/ethernet/neterion/s2io.c
@@ -4153,8 +4153,6 @@ static netdev_tx_t s2io_xmit(struct sk_buff *skb, struct net_device *dev)
writeq(val64, &tx_fifo->List_Control);
- mmiowb();
-
put_off++;
if (put_off == fifo->tx_curr_put_info.fifo_len + 1)
put_off = 0;
diff --git a/drivers/net/ethernet/neterion/vxge/vxge-main.c b/drivers/net/ethernet/neterion/vxge/vxge-main.c
index b877acec5cde..1d334f2e0a56 100644
--- a/drivers/net/ethernet/neterion/vxge/vxge-main.c
+++ b/drivers/net/ethernet/neterion/vxge/vxge-main.c
@@ -1826,7 +1826,6 @@ static int vxge_poll_msix(struct napi_struct *napi, int budget)
vxge_hw_channel_msix_unmask(
(struct __vxge_hw_channel *)ring->handle,
ring->rx_vector_no);
- mmiowb();
}
/* We are copying and returning the local variable, in case if after
@@ -2234,8 +2233,6 @@ static irqreturn_t vxge_tx_msix_handle(int irq, void *dev_id)
vxge_hw_channel_msix_unmask((struct __vxge_hw_channel *)fifo->handle,
fifo->tx_vector_no);
- mmiowb();
-
return IRQ_HANDLED;
}
@@ -2272,14 +2269,12 @@ vxge_alarm_msix_handle(int irq, void *dev_id)
*/
vxge_hw_vpath_msix_mask(vdev->vpaths[i].handle, msix_id);
vxge_hw_vpath_msix_clear(vdev->vpaths[i].handle, msix_id);
- mmiowb();
status = vxge_hw_vpath_alarm_process(vdev->vpaths[i].handle,
vdev->exec_mode);
if (status == VXGE_HW_OK) {
vxge_hw_vpath_msix_unmask(vdev->vpaths[i].handle,
msix_id);
- mmiowb();
continue;
}
vxge_debug_intr(VXGE_ERR,
diff --git a/drivers/net/ethernet/neterion/vxge/vxge-traffic.c b/drivers/net/ethernet/neterion/vxge/vxge-traffic.c
index 59e77e3086bb..709d20d9938f 100644
--- a/drivers/net/ethernet/neterion/vxge/vxge-traffic.c
+++ b/drivers/net/ethernet/neterion/vxge/vxge-traffic.c
@@ -1399,11 +1399,7 @@ static void __vxge_hw_non_offload_db_post(struct __vxge_hw_fifo *fifo,
VXGE_HW_NODBW_GET_NO_SNOOP(no_snoop),
&fifo->nofl_db->control_0);
- mmiowb();
-
writeq(txdl_ptr, &fifo->nofl_db->txdl_ptr);
-
- mmiowb();
}
/**
diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c
index 8848d5bed6e5..fdfedbc8e431 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_int.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_int.c
@@ -814,18 +814,12 @@ static inline u16 qed_attn_update_idx(struct qed_hwfn *p_hwfn,
{
u16 rc = 0, index;
- /* Make certain HW write took affect */
- mmiowb();
-
index = le16_to_cpu(p_sb_desc->sb_attn->sb_index);
if (p_sb_desc->index != index) {
p_sb_desc->index = index;
rc = QED_SB_ATT_IDX;
}
- /* Make certain we got a consistent view with HW */
- mmiowb();
-
return rc;
}
@@ -1213,7 +1207,6 @@ static void qed_sb_ack_attn(struct qed_hwfn *p_hwfn,
/* Both segments (interrupts & acks) are written to same place address;
* Need to guarantee all commands will be received (in-order) by HW.
*/
- mmiowb();
barrier();
}
@@ -1848,9 +1841,6 @@ static void qed_int_igu_enable_attn(struct qed_hwfn *p_hwfn,
qed_wr(p_hwfn, p_ptt, IGU_REG_TRAILING_EDGE_LATCH, 0xfff);
qed_wr(p_hwfn, p_ptt, IGU_REG_ATTENTION_ENABLE, 0xfff);
- /* Flush the writes to IGU */
- mmiowb();
-
/* Unmask AEU signals toward IGU */
qed_wr(p_hwfn, p_ptt, MISC_REG_AEU_MASK_ATTN_IGU, 0xff);
}
@@ -1914,9 +1904,6 @@ static void qed_int_igu_cleanup_sb(struct qed_hwfn *p_hwfn,
qed_wr(p_hwfn, p_ptt, IGU_REG_COMMAND_REG_CTRL, cmd_ctrl);
- /* Flush the write to IGU */
- mmiowb();
-
/* calculate where to read the status bit from */
sb_bit = 1 << (igu_sb_id % 32);
sb_bit_addr = igu_sb_id / 32 * sizeof(u32);
diff --git a/drivers/net/ethernet/qlogic/qed/qed_spq.c b/drivers/net/ethernet/qlogic/qed/qed_spq.c
index 79b311b86f66..f5f3c03b9dd2 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_spq.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_spq.c
@@ -341,9 +341,6 @@ void qed_eq_prod_update(struct qed_hwfn *p_hwfn, u16 prod)
USTORM_EQE_CONS_OFFSET(p_hwfn->rel_pf_id);
REG_WR16(p_hwfn, addr, prod);
-
- /* keep prod updates ordered */
- mmiowb();
}
int qed_eq_completion(struct qed_hwfn *p_hwfn, void *cookie)
diff --git a/drivers/net/ethernet/qlogic/qede/qede_ethtool.c b/drivers/net/ethernet/qlogic/qede/qede_ethtool.c
index b4c8949933f1..4555c0b161ef 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_ethtool.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_ethtool.c
@@ -1526,14 +1526,6 @@ static int qede_selftest_transmit_traffic(struct qede_dev *edev,
barrier();
writel(txq->tx_db.raw, txq->doorbell_addr);
- /* mmiowb is needed to synchronize doorbell writes from more than one
- * processor. It guarantees that the write arrives to the device before
- * the queue lock is released and another start_xmit is called (possibly
- * on another CPU). Without this barrier, the next doorbell can bypass
- * this doorbell. This is applicable to IA64/Altix systems.
- */
- mmiowb();
-
for (i = 0; i < QEDE_SELFTEST_POLL_COUNT; i++) {
if (qede_txq_has_work(txq))
break;
diff --git a/drivers/net/ethernet/qlogic/qede/qede_fp.c b/drivers/net/ethernet/qlogic/qede/qede_fp.c
index 31b046e24565..6f7e3622c6b4 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_fp.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_fp.c
@@ -580,14 +580,6 @@ void qede_update_rx_prod(struct qede_dev *edev, struct qede_rx_queue *rxq)
internal_ram_wr(rxq->hw_rxq_prod_addr, sizeof(rx_prods),
(u32 *)&rx_prods);
-
- /* mmiowb is needed to synchronize doorbell writes from more than one
- * processor. It guarantees that the write arrives to the device before
- * the napi lock is released and another qede_poll is called (possibly
- * on another CPU). Without this barrier, the next doorbell can bypass
- * this doorbell. This is applicable to IA64/Altix systems.
- */
- mmiowb();
}
static void qede_get_rxhash(struct sk_buff *skb, u8 bitfields, __le32 rss_hash)
diff --git a/drivers/net/ethernet/qlogic/qla3xxx.c b/drivers/net/ethernet/qlogic/qla3xxx.c
index b61b88cbc0c7..457444894d80 100644
--- a/drivers/net/ethernet/qlogic/qla3xxx.c
+++ b/drivers/net/ethernet/qlogic/qla3xxx.c
@@ -1858,7 +1858,6 @@ static void ql_update_small_bufq_prod_index(struct ql3_adapter *qdev)
wmb();
writel_relaxed(qdev->small_buf_q_producer_index,
&port_regs->CommonRegs.rxSmallQProducerIndex);
- mmiowb();
}
}
diff --git a/drivers/net/ethernet/qlogic/qlge/qlge.h b/drivers/net/ethernet/qlogic/qlge/qlge.h
index 3e71b65a9546..ad7c5eb8a3b6 100644
--- a/drivers/net/ethernet/qlogic/qlge/qlge.h
+++ b/drivers/net/ethernet/qlogic/qlge/qlge.h
@@ -2181,7 +2181,6 @@ static inline void ql_write32(const struct ql_adapter *qdev, int reg, u32 val)
static inline void ql_write_db_reg(u32 val, void __iomem *addr)
{
writel(val, addr);
- mmiowb();
}
/*
diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
index 07e1c623048e..6cae33072496 100644
--- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
+++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
@@ -2695,7 +2695,6 @@ static netdev_tx_t qlge_send(struct sk_buff *skb, struct net_device *ndev)
wmb();
ql_write_db_reg_relaxed(tx_ring->prod_idx, tx_ring->prod_idx_db_reg);
- mmiowb();
netif_printk(qdev, tx_queued, KERN_DEBUG, qdev->ndev,
"tx queued, slot %d, len %d\n",
tx_ring->prod_idx, skb->len);
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 8154b38c08f7..316b47741d3f 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -728,7 +728,6 @@ static irqreturn_t ravb_emac_interrupt(int irq, void *dev_id)
spin_lock(&priv->lock);
ravb_emac_interrupt_unlocked(ndev);
- mmiowb();
spin_unlock(&priv->lock);
return IRQ_HANDLED;
}
@@ -848,7 +847,6 @@ static irqreturn_t ravb_interrupt(int irq, void *dev_id)
result = IRQ_HANDLED;
}
- mmiowb();
spin_unlock(&priv->lock);
return result;
}
@@ -881,7 +879,6 @@ static irqreturn_t ravb_multi_interrupt(int irq, void *dev_id)
result = IRQ_HANDLED;
}
- mmiowb();
spin_unlock(&priv->lock);
return result;
}
@@ -898,7 +895,6 @@ static irqreturn_t ravb_dma_interrupt(int irq, void *dev_id, int q)
if (ravb_queue_interrupt(ndev, q))
result = IRQ_HANDLED;
- mmiowb();
spin_unlock(&priv->lock);
return result;
}
@@ -943,7 +939,6 @@ static int ravb_poll(struct napi_struct *napi, int budget)
ravb_write(ndev, ~(mask | TIS_RESERVED), TIS);
ravb_tx_free(ndev, q, true);
netif_wake_subqueue(ndev, q);
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
}
}
@@ -959,7 +954,6 @@ static int ravb_poll(struct napi_struct *napi, int budget)
ravb_write(ndev, mask, RIE0);
ravb_write(ndev, mask, TIE);
}
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
/* Receive error message handling */
@@ -1008,7 +1002,6 @@ static void ravb_adjust_link(struct net_device *ndev)
if (priv->no_avb_link && phydev->link)
ravb_rcv_snd_enable(ndev);
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
if (new_state && netif_msg_link(priv))
@@ -1601,7 +1594,6 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
netif_stop_subqueue(ndev, q);
exit:
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
return NETDEV_TX_OK;
@@ -1673,7 +1665,6 @@ static void ravb_set_rx_mode(struct net_device *ndev)
spin_lock_irqsave(&priv->lock, flags);
ravb_modify(ndev, ECMR, ECMR_PRM,
ndev->flags & IFF_PROMISC ? ECMR_PRM : 0);
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
}
diff --git a/drivers/net/ethernet/renesas/ravb_ptp.c b/drivers/net/ethernet/renesas/ravb_ptp.c
index dce2a40a31e3..9a42580693cb 100644
--- a/drivers/net/ethernet/renesas/ravb_ptp.c
+++ b/drivers/net/ethernet/renesas/ravb_ptp.c
@@ -196,7 +196,6 @@ static int ravb_ptp_extts(struct ptp_clock_info *ptp,
ravb_write(ndev, GIE_PTCS, GIE);
else
ravb_write(ndev, GID_PTCD, GID);
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
@@ -259,7 +258,6 @@ static int ravb_ptp_perout(struct ptp_clock_info *ptp,
else
ravb_write(ndev, GID_PTMD0, GID);
}
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
return error;
@@ -331,7 +329,6 @@ void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
spin_lock_irqsave(&priv->lock, flags);
ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP);
- mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev);
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index e33af371b169..ed30aebdb941 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -2010,7 +2010,6 @@ static void sh_eth_adjust_link(struct net_device *ndev)
if ((mdp->cd->no_psr || mdp->no_ether_link) && phydev->link)
sh_eth_rcv_snd_enable(ndev);
- mmiowb();
spin_unlock_irqrestore(&mdp->lock, flags);
if (new_state && netif_msg_link(mdp))
diff --git a/drivers/net/ethernet/sfc/falcon/io.h b/drivers/net/ethernet/sfc/falcon/io.h
index 7085ee1d5e2b..c3577643fbda 100644
--- a/drivers/net/ethernet/sfc/falcon/io.h
+++ b/drivers/net/ethernet/sfc/falcon/io.h
@@ -108,7 +108,6 @@ static inline void ef4_writeo(struct ef4_nic *efx, const ef4_oword_t *value,
_ef4_writed(efx, value->u32[2], reg + 8);
_ef4_writed(efx, value->u32[3], reg + 12);
#endif
- mmiowb();
spin_unlock_irqrestore(&efx->biu_lock, flags);
}
@@ -130,7 +129,6 @@ static inline void ef4_sram_writeq(struct ef4_nic *efx, void __iomem *membase,
__raw_writel((__force u32)value->u32[0], membase + addr);
__raw_writel((__force u32)value->u32[1], membase + addr + 4);
#endif
- mmiowb();
spin_unlock_irqrestore(&efx->biu_lock, flags);
}
diff --git a/drivers/net/ethernet/sfc/io.h b/drivers/net/ethernet/sfc/io.h
index 89563170af52..2774a10f44e9 100644
--- a/drivers/net/ethernet/sfc/io.h
+++ b/drivers/net/ethernet/sfc/io.h
@@ -120,7 +120,6 @@ static inline void efx_writeo(struct efx_nic *efx, const efx_oword_t *value,
_efx_writed(efx, value->u32[2], reg + 8);
_efx_writed(efx, value->u32[3], reg + 12);
#endif
- mmiowb();
spin_unlock_irqrestore(&efx->biu_lock, flags);
}
@@ -142,7 +141,6 @@ static inline void efx_sram_writeq(struct efx_nic *efx, void __iomem *membase,
__raw_writel((__force u32)value->u32[0], membase + addr);
__raw_writel((__force u32)value->u32[1], membase + addr + 4);
#endif
- mmiowb();
spin_unlock_irqrestore(&efx->biu_lock, flags);
}
diff --git a/drivers/net/ethernet/silan/sc92031.c b/drivers/net/ethernet/silan/sc92031.c
index c07fd594fe71..02b3962b0e63 100644
--- a/drivers/net/ethernet/silan/sc92031.c
+++ b/drivers/net/ethernet/silan/sc92031.c
@@ -251,7 +251,6 @@ enum PMConfigBits {
* use of mdelay() at _sc92031_reset.
* Functions prefixed with _sc92031_ must be called with the lock held;
* functions prefixed with sc92031_ must be called without the lock held.
- * Use mmiowb() before unlocking if the hardware was written to.
*/
/* Locking rules for the interrupt:
@@ -361,7 +360,6 @@ static void sc92031_disable_interrupts(struct net_device *dev)
/* stop interrupts */
iowrite32(0, port_base + IntrMask);
_sc92031_dummy_read(port_base);
- mmiowb();
/* wait for any concurrent interrupt/tasklet to finish */
synchronize_irq(priv->pdev->irq);
@@ -379,7 +377,6 @@ static void sc92031_enable_interrupts(struct net_device *dev)
wmb();
iowrite32(IntrBits, port_base + IntrMask);
- mmiowb();
}
static void _sc92031_disable_tx_rx(struct net_device *dev)
@@ -867,7 +864,6 @@ out:
rmb();
iowrite32(intr_mask, port_base + IntrMask);
- mmiowb();
spin_unlock(&priv->lock);
}
@@ -901,7 +897,6 @@ out_none:
rmb();
iowrite32(intr_mask, port_base + IntrMask);
- mmiowb();
return IRQ_NONE;
}
@@ -978,7 +973,6 @@ static netdev_tx_t sc92031_start_xmit(struct sk_buff *skb,
iowrite32(priv->tx_bufs_dma_addr + entry * TX_BUF_SIZE,
port_base + TxAddr0 + entry * 4);
iowrite32(tx_status, port_base + TxStatus0 + entry * 4);
- mmiowb();
if (priv->tx_head - priv->tx_tail >= NUM_TX_DESC)
netif_stop_queue(dev);
@@ -1024,7 +1018,6 @@ static int sc92031_open(struct net_device *dev)
spin_lock_bh(&priv->lock);
_sc92031_reset(dev);
- mmiowb();
spin_unlock_bh(&priv->lock);
sc92031_enable_interrupts(dev);
@@ -1060,7 +1053,6 @@ static int sc92031_stop(struct net_device *dev)
_sc92031_disable_tx_rx(dev);
_sc92031_tx_clear(dev);
- mmiowb();
spin_unlock_bh(&priv->lock);
@@ -1081,7 +1073,6 @@ static void sc92031_set_multicast_list(struct net_device *dev)
_sc92031_set_mar(dev);
_sc92031_set_rx_config(dev);
- mmiowb();
spin_unlock_bh(&priv->lock);
}
@@ -1098,7 +1089,6 @@ static void sc92031_tx_timeout(struct net_device *dev)
priv->tx_timeouts++;
_sc92031_reset(dev);
- mmiowb();
spin_unlock(&priv->lock);
@@ -1140,7 +1130,6 @@ sc92031_ethtool_get_link_ksettings(struct net_device *dev,
output_status = _sc92031_mii_read(port_base, MII_OutputStatus);
_sc92031_mii_scan(port_base);
- mmiowb();
spin_unlock_bh(&priv->lock);
@@ -1311,7 +1300,6 @@ static int sc92031_ethtool_set_wol(struct net_device *dev,
priv->pm_config = pm_config;
iowrite32(pm_config, port_base + PMConfig);
- mmiowb();
spin_unlock_bh(&priv->lock);
@@ -1337,7 +1325,6 @@ static int sc92031_ethtool_nway_reset(struct net_device *dev)
out:
_sc92031_mii_scan(port_base);
- mmiowb();
spin_unlock_bh(&priv->lock);
@@ -1530,7 +1517,6 @@ static int sc92031_suspend(struct pci_dev *pdev, pm_message_t state)
_sc92031_disable_tx_rx(dev);
_sc92031_tx_clear(dev);
- mmiowb();
spin_unlock_bh(&priv->lock);
@@ -1555,7 +1541,6 @@ static int sc92031_resume(struct pci_dev *pdev)
spin_lock_bh(&priv->lock);
_sc92031_reset(dev);
- mmiowb();
spin_unlock_bh(&priv->lock);
sc92031_enable_interrupts(dev);
diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
index 33949248c829..ab55416a10fa 100644
--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -571,7 +571,6 @@ static void rhine_ack_events(struct rhine_private *rp, u32 mask)
if (rp->quirks & rqStatusWBRace)
iowrite8(mask >> 16, ioaddr + IntrStatus2);
iowrite16(mask, ioaddr + IntrStatus);
- mmiowb();
}
/*
@@ -863,7 +862,6 @@ static int rhine_napipoll(struct napi_struct *napi, int budget)
if (work_done < budget) {
napi_complete_done(napi, work_done);
iowrite16(enable_mask, ioaddr + IntrEnable);
- mmiowb();
}
return work_done;
}
@@ -1893,7 +1891,6 @@ static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
static void rhine_irq_disable(struct rhine_private *rp)
{
iowrite16(0x0000, rp->base + IntrEnable);
- mmiowb();
}
/* The interrupt handler does all of the Rx thread work and cleans up
diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index d8ba512f166a..1713c2d2dccf 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -219,7 +219,6 @@ static inline int __w5100_write_direct(struct net_device *ndev, u32 addr,
static inline int w5100_write_direct(struct net_device *ndev, u32 addr, u8 data)
{
__w5100_write_direct(ndev, addr, data);
- mmiowb();
return 0;
}
@@ -236,7 +235,6 @@ static int w5100_write16_direct(struct net_device *ndev, u32 addr, u16 data)
{
__w5100_write_direct(ndev, addr, data >> 8);
__w5100_write_direct(ndev, addr + 1, data);
- mmiowb();
return 0;
}
@@ -260,8 +258,6 @@ static int w5100_writebulk_direct(struct net_device *ndev, u32 addr,
for (i = 0; i < len; i++, addr++)
__w5100_write_direct(ndev, addr, *buf++);
- mmiowb();
-
return 0;
}
@@ -375,7 +371,6 @@ static int w5100_readbulk_indirect(struct net_device *ndev, u32 addr, u8 *buf,
for (i = 0; i < len; i++)
*buf++ = w5100_read_direct(ndev, W5100_IDM_DR);
- mmiowb();
spin_unlock_irqrestore(&mmio_priv->reg_lock, flags);
return 0;
@@ -394,7 +389,6 @@ static int w5100_writebulk_indirect(struct net_device *ndev, u32 addr,
for (i = 0; i < len; i++)
__w5100_write_direct(ndev, W5100_IDM_DR, *buf++);
- mmiowb();
spin_unlock_irqrestore(&mmio_priv->reg_lock, flags);
return 0;
diff --git a/drivers/net/ethernet/wiznet/w5300.c b/drivers/net/ethernet/wiznet/w5300.c
index f9da5d6172e3..3f03eecc0479 100644
--- a/drivers/net/ethernet/wiznet/w5300.c
+++ b/drivers/net/ethernet/wiznet/w5300.c
@@ -141,7 +141,6 @@ static u16 w5300_read_indirect(struct w5300_priv *priv, u16 addr)
spin_lock_irqsave(&priv->reg_lock, flags);
w5300_write_direct(priv, W5300_IDM_AR, addr);
- mmiowb();
data = w5300_read_direct(priv, W5300_IDM_DR);
spin_unlock_irqrestore(&priv->reg_lock, flags);
@@ -154,9 +153,7 @@ static void w5300_write_indirect(struct w5300_priv *priv, u16 addr, u16 data)
spin_lock_irqsave(&priv->reg_lock, flags);
w5300_write_direct(priv, W5300_IDM_AR, addr);
- mmiowb();
w5300_write_direct(priv, W5300_IDM_DR, data);
- mmiowb();
spin_unlock_irqrestore(&priv->reg_lock, flags);
}
@@ -192,7 +189,6 @@ static int w5300_command(struct w5300_priv *priv, u16 cmd)
unsigned long timeout = jiffies + msecs_to_jiffies(100);
w5300_write(priv, W5300_S0_CR, cmd);
- mmiowb();
while (w5300_read(priv, W5300_S0_CR) != 0) {
if (time_after(jiffies, timeout))
@@ -241,18 +237,15 @@ static void w5300_write_macaddr(struct w5300_priv *priv)
w5300_write(priv, W5300_SHARH,
ndev->dev_addr[4] << 8 |
ndev->dev_addr[5]);
- mmiowb();
}
static void w5300_hw_reset(struct w5300_priv *priv)
{
w5300_write_direct(priv, W5300_MR, MR_RST);
- mmiowb();
mdelay(5);
w5300_write_direct(priv, W5300_MR, priv->indirect ?
MR_WDF(7) | MR_PB | MR_IND :
MR_WDF(7) | MR_PB);
- mmiowb();
w5300_write(priv, W5300_IMR, 0);
w5300_write_macaddr(priv);
@@ -264,24 +257,20 @@ static void w5300_hw_reset(struct w5300_priv *priv)
w5300_write32(priv, W5300_TMSRL, 64 << 24);
w5300_write32(priv, W5300_TMSRH, 0);
w5300_write(priv, W5300_MTYPE, 0x00ff);
- mmiowb();
}
static void w5300_hw_start(struct w5300_priv *priv)
{
w5300_write(priv, W5300_S0_MR, priv->promisc ?
S0_MR_MACRAW : S0_MR_MACRAW_MF);
- mmiowb();
w5300_command(priv, S0_CR_OPEN);
w5300_write(priv, W5300_S0_IMR, S0_IR_RECV | S0_IR_SENDOK);
w5300_write(priv, W5300_IMR, IR_S0);
- mmiowb();
}
static void w5300_hw_close(struct w5300_priv *priv)
{
w5300_write(priv, W5300_IMR, 0);
- mmiowb();
w5300_command(priv, S0_CR_CLOSE);
}
@@ -372,7 +361,6 @@ static netdev_tx_t w5300_start_tx(struct sk_buff *skb, struct net_device *ndev)
netif_stop_queue(ndev);
w5300_write_frame(priv, skb->data, skb->len);
- mmiowb();
ndev->stats.tx_packets++;
ndev->stats.tx_bytes += skb->len;
dev_kfree_skb(skb);
@@ -419,7 +407,6 @@ static int w5300_napi_poll(struct napi_struct *napi, int budget)
if (rx_count < budget) {
napi_complete_done(napi, rx_count);
w5300_write(priv, W5300_IMR, IR_S0);
- mmiowb();
}
return rx_count;
@@ -434,7 +421,6 @@ static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
if (!ir)
return IRQ_NONE;
w5300_write(priv, W5300_S0_IR, ir);
- mmiowb();
if (ir & S0_IR_SENDOK) {
netif_dbg(priv, tx_done, ndev, "tx done\n");
@@ -444,7 +430,6 @@ static irqreturn_t w5300_interrupt(int irq, void *ndev_instance)
if (ir & S0_IR_RECV) {
if (napi_schedule_prep(&priv->napi)) {
w5300_write(priv, W5300_IMR, 0);
- mmiowb();
__napi_schedule(&priv->napi);
}
}
diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index a2351ef45ae0..65a4c142640d 100644
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -837,7 +837,6 @@ ath5k_txbuf_setup(struct ath5k_hw *ah, struct ath5k_buf *bf,
txq->link = &ds->ds_link;
ath5k_hw_start_tx_dma(ah, txq->qnum);
- mmiowb();
spin_unlock_bh(&txq->lock);
return 0;
@@ -2174,7 +2173,6 @@ ath5k_beacon_config(struct ath5k_hw *ah)
}
ath5k_hw_set_imr(ah, ah->imask);
- mmiowb();
spin_unlock_bh(&ah->block);
}
@@ -2779,7 +2777,6 @@ int ath5k_start(struct ieee80211_hw *hw)
ret = 0;
done:
- mmiowb();
mutex_unlock(&ah->lock);
set_bit(ATH_STAT_STARTED, ah->status);
@@ -2839,7 +2836,6 @@ void ath5k_stop(struct ieee80211_hw *hw)
"putting device to sleep\n");
}
- mmiowb();
mutex_unlock(&ah->lock);
ath5k_stop_tasklets(ah);
diff --git a/drivers/net/wireless/ath/ath5k/mac80211-ops.c b/drivers/net/wireless/ath/ath5k/mac80211-ops.c
index 16e052d02c94..5e866a193ed0 100644
--- a/drivers/net/wireless/ath/ath5k/mac80211-ops.c
+++ b/drivers/net/wireless/ath/ath5k/mac80211-ops.c
@@ -263,7 +263,6 @@ ath5k_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
memcpy(common->curbssid, bss_conf->bssid, ETH_ALEN);
common->curaid = 0;
ath5k_hw_set_bssid(ah);
- mmiowb();
}
if (changes & BSS_CHANGED_BEACON_INT)
@@ -528,7 +527,6 @@ ath5k_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
ret = -EINVAL;
}
- mmiowb();
mutex_unlock(&ah->lock);
return ret;
}
diff --git a/drivers/net/wireless/broadcom/b43/main.c b/drivers/net/wireless/broadcom/b43/main.c
index 74be3c809225..4c7980f84591 100644
--- a/drivers/net/wireless/broadcom/b43/main.c
+++ b/drivers/net/wireless/broadcom/b43/main.c
@@ -485,7 +485,6 @@ static void b43_ram_write(struct b43_wldev *dev, u16 offset, u32 val)
val = swab32(val);
b43_write32(dev, B43_MMIO_RAM_CONTROL, offset);
- mmiowb();
b43_write32(dev, B43_MMIO_RAM_DATA, val);
}
@@ -656,9 +655,7 @@ static void b43_tsf_write_locked(struct b43_wldev *dev, u64 tsf)
/* The hardware guarantees us an atomic write, if we
* write the low register first. */
b43_write32(dev, B43_MMIO_REV3PLUS_TSF_LOW, low);
- mmiowb();
b43_write32(dev, B43_MMIO_REV3PLUS_TSF_HIGH, high);
- mmiowb();
}
void b43_tsf_write(struct b43_wldev *dev, u64 tsf)
@@ -1822,11 +1819,9 @@ static void b43_beacon_update_trigger_work(struct work_struct *work)
if (b43_bus_host_is_sdio(dev->dev)) {
/* wl->mutex is enough. */
b43_do_beacon_update_trigger_work(dev);
- mmiowb();
} else {
spin_lock_irq(&wl->hardirq_lock);
b43_do_beacon_update_trigger_work(dev);
- mmiowb();
spin_unlock_irq(&wl->hardirq_lock);
}
}
@@ -2078,7 +2073,6 @@ static irqreturn_t b43_interrupt_thread_handler(int irq, void *dev_id)
mutex_lock(&dev->wl->mutex);
b43_do_interrupt_thread(dev);
- mmiowb();
mutex_unlock(&dev->wl->mutex);
return IRQ_HANDLED;
@@ -2143,7 +2137,6 @@ static irqreturn_t b43_interrupt_handler(int irq, void *dev_id)
spin_lock(&dev->wl->hardirq_lock);
ret = b43_do_interrupt(dev);
- mmiowb();
spin_unlock(&dev->wl->hardirq_lock);
return ret;
diff --git a/drivers/net/wireless/broadcom/b43/sysfs.c b/drivers/net/wireless/broadcom/b43/sysfs.c
index 3190493bd07f..93d03b673670 100644
--- a/drivers/net/wireless/broadcom/b43/sysfs.c
+++ b/drivers/net/wireless/broadcom/b43/sysfs.c
@@ -129,7 +129,6 @@ static ssize_t b43_attr_interfmode_store(struct device *dev,
} else
err = -ENOSYS;
- mmiowb();
mutex_unlock(&wldev->wl->mutex);
return err ? err : count;
diff --git a/drivers/net/wireless/broadcom/b43legacy/ilt.c b/drivers/net/wireless/broadcom/b43legacy/ilt.c
index ee5682e54204..6d15fb4d30c6 100644
--- a/drivers/net/wireless/broadcom/b43legacy/ilt.c
+++ b/drivers/net/wireless/broadcom/b43legacy/ilt.c
@@ -315,14 +315,12 @@ const u16 b43legacy_ilt_sigmasqr2[B43legacy_ILT_SIGMASQR_SIZE] = {
void b43legacy_ilt_write(struct b43legacy_wldev *dev, u16 offset, u16 val)
{
b43legacy_phy_write(dev, B43legacy_PHY_ILT_G_CTRL, offset);
- mmiowb();
b43legacy_phy_write(dev, B43legacy_PHY_ILT_G_DATA1, val);
}
void b43legacy_ilt_write32(struct b43legacy_wldev *dev, u16 offset, u32 val)
{
b43legacy_phy_write(dev, B43legacy_PHY_ILT_G_CTRL, offset);
- mmiowb();
b43legacy_phy_write(dev, B43legacy_PHY_ILT_G_DATA2,
(val & 0xFFFF0000) >> 16);
b43legacy_phy_write(dev, B43legacy_PHY_ILT_G_DATA1,
diff --git a/drivers/net/wireless/broadcom/b43legacy/main.c b/drivers/net/wireless/broadcom/b43legacy/main.c
index 55f411925960..c777efc6dc13 100644
--- a/drivers/net/wireless/broadcom/b43legacy/main.c
+++ b/drivers/net/wireless/broadcom/b43legacy/main.c
@@ -264,7 +264,6 @@ static void b43legacy_ram_write(struct b43legacy_wldev *dev, u16 offset,
val = swab32(val);
b43legacy_write32(dev, B43legacy_MMIO_RAM_CONTROL, offset);
- mmiowb();
b43legacy_write32(dev, B43legacy_MMIO_RAM_DATA, val);
}
@@ -341,14 +340,11 @@ void b43legacy_shm_write32(struct b43legacy_wldev *dev,
if (offset & 0x0003) {
/* Unaligned access */
b43legacy_shm_control_word(dev, routing, offset >> 2);
- mmiowb();
b43legacy_write16(dev,
B43legacy_MMIO_SHM_DATA_UNALIGNED,
(value >> 16) & 0xffff);
- mmiowb();
b43legacy_shm_control_word(dev, routing,
(offset >> 2) + 1);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_SHM_DATA,
value & 0xffff);
return;
@@ -356,7 +352,6 @@ void b43legacy_shm_write32(struct b43legacy_wldev *dev,
offset >>= 2;
}
b43legacy_shm_control_word(dev, routing, offset);
- mmiowb();
b43legacy_write32(dev, B43legacy_MMIO_SHM_DATA, value);
}
@@ -368,7 +363,6 @@ void b43legacy_shm_write16(struct b43legacy_wldev *dev, u16 routing, u16 offset,
if (offset & 0x0003) {
/* Unaligned access */
b43legacy_shm_control_word(dev, routing, offset >> 2);
- mmiowb();
b43legacy_write16(dev,
B43legacy_MMIO_SHM_DATA_UNALIGNED,
value);
@@ -377,7 +371,6 @@ void b43legacy_shm_write16(struct b43legacy_wldev *dev, u16 routing, u16 offset,
offset >>= 2;
}
b43legacy_shm_control_word(dev, routing, offset);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_SHM_DATA, value);
}
@@ -471,7 +464,6 @@ static void b43legacy_time_lock(struct b43legacy_wldev *dev)
status = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
status |= B43legacy_MACCTL_TBTTHOLD;
b43legacy_write32(dev, B43legacy_MMIO_MACCTL, status);
- mmiowb();
}
static void b43legacy_time_unlock(struct b43legacy_wldev *dev)
@@ -494,10 +486,8 @@ static void b43legacy_tsf_write_locked(struct b43legacy_wldev *dev, u64 tsf)
u32 hi = (tsf & 0xFFFFFFFF00000000ULL) >> 32;
b43legacy_write32(dev, B43legacy_MMIO_REV3PLUS_TSF_LOW, 0);
- mmiowb();
b43legacy_write32(dev, B43legacy_MMIO_REV3PLUS_TSF_HIGH,
hi);
- mmiowb();
b43legacy_write32(dev, B43legacy_MMIO_REV3PLUS_TSF_LOW,
lo);
} else {
@@ -507,13 +497,9 @@ static void b43legacy_tsf_write_locked(struct b43legacy_wldev *dev, u64 tsf)
u16 v3 = (tsf & 0xFFFF000000000000ULL) >> 48;
b43legacy_write16(dev, B43legacy_MMIO_TSF_0, 0);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_TSF_3, v3);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_TSF_2, v2);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_TSF_1, v1);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_TSF_0, v0);
}
}
@@ -1250,7 +1236,6 @@ static void b43legacy_beacon_update_trigger_work(struct work_struct *work)
/* The handler might have updated the IRQ mask. */
b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK,
dev->irq_mask);
- mmiowb();
spin_unlock_irq(&wl->irq_lock);
}
mutex_unlock(&wl->mutex);
@@ -1346,7 +1331,6 @@ static void b43legacy_interrupt_tasklet(struct b43legacy_wldev *dev)
dma_reason[2], dma_reason[3],
dma_reason[4], dma_reason[5]);
b43legacy_controller_restart(dev, "DMA error");
- mmiowb();
spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
return;
}
@@ -1396,7 +1380,6 @@ static void b43legacy_interrupt_tasklet(struct b43legacy_wldev *dev)
handle_irq_transmit_status(dev);
b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);
- mmiowb();
spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
}
@@ -1488,7 +1471,6 @@ static irqreturn_t b43legacy_interrupt_handler(int irq, void *dev_id)
dev->irq_reason = reason;
tasklet_schedule(&dev->isr_tasklet);
out:
- mmiowb();
spin_unlock(&dev->wl->irq_lock);
return ret;
@@ -2781,7 +2763,6 @@ static int b43legacy_op_dev_config(struct ieee80211_hw *hw,
spin_lock_irqsave(&wl->irq_lock, flags);
b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);
- mmiowb();
spin_unlock_irqrestore(&wl->irq_lock, flags);
out_unlock_mutex:
mutex_unlock(&wl->mutex);
@@ -2900,7 +2881,6 @@ static void b43legacy_op_bss_info_changed(struct ieee80211_hw *hw,
spin_lock_irqsave(&wl->irq_lock, flags);
b43legacy_write32(dev, B43legacy_MMIO_GEN_IRQ_MASK, dev->irq_mask);
/* XXX: why? */
- mmiowb();
spin_unlock_irqrestore(&wl->irq_lock, flags);
out_unlock_mutex:
mutex_unlock(&wl->mutex);
diff --git a/drivers/net/wireless/broadcom/b43legacy/phy.c b/drivers/net/wireless/broadcom/b43legacy/phy.c
index 995c7d0c212a..f949766d27ca 100644
--- a/drivers/net/wireless/broadcom/b43legacy/phy.c
+++ b/drivers/net/wireless/broadcom/b43legacy/phy.c
@@ -134,7 +134,6 @@ u16 b43legacy_phy_read(struct b43legacy_wldev *dev, u16 offset)
void b43legacy_phy_write(struct b43legacy_wldev *dev, u16 offset, u16 val)
{
b43legacy_write16(dev, B43legacy_MMIO_PHY_CONTROL, offset);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_PHY_DATA, val);
}
diff --git a/drivers/net/wireless/broadcom/b43legacy/pio.h b/drivers/net/wireless/broadcom/b43legacy/pio.h
index 1cd1b9ca5e9c..08cd02282beb 100644
--- a/drivers/net/wireless/broadcom/b43legacy/pio.h
+++ b/drivers/net/wireless/broadcom/b43legacy/pio.h
@@ -92,7 +92,6 @@ void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
u16 offset, u16 value)
{
b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
- mmiowb();
}
diff --git a/drivers/net/wireless/broadcom/b43legacy/radio.c b/drivers/net/wireless/broadcom/b43legacy/radio.c
index eab1c9387846..c6db444ea07e 100644
--- a/drivers/net/wireless/broadcom/b43legacy/radio.c
+++ b/drivers/net/wireless/broadcom/b43legacy/radio.c
@@ -95,7 +95,6 @@ void b43legacy_radio_lock(struct b43legacy_wldev *dev)
B43legacy_WARN_ON(status & B43legacy_MACCTL_RADIOLOCK);
status |= B43legacy_MACCTL_RADIOLOCK;
b43legacy_write32(dev, B43legacy_MMIO_MACCTL, status);
- mmiowb();
udelay(10);
}
@@ -108,7 +107,6 @@ void b43legacy_radio_unlock(struct b43legacy_wldev *dev)
B43legacy_WARN_ON(!(status & B43legacy_MACCTL_RADIOLOCK));
status &= ~B43legacy_MACCTL_RADIOLOCK;
b43legacy_write32(dev, B43legacy_MMIO_MACCTL, status);
- mmiowb();
}
u16 b43legacy_radio_read16(struct b43legacy_wldev *dev, u16 offset)
@@ -141,7 +139,6 @@ u16 b43legacy_radio_read16(struct b43legacy_wldev *dev, u16 offset)
void b43legacy_radio_write16(struct b43legacy_wldev *dev, u16 offset, u16 val)
{
b43legacy_write16(dev, B43legacy_MMIO_RADIO_CONTROL, offset);
- mmiowb();
b43legacy_write16(dev, B43legacy_MMIO_RADIO_DATA_LOW, val);
}
@@ -333,7 +330,6 @@ u8 b43legacy_radio_aci_scan(struct b43legacy_wldev *dev)
void b43legacy_nrssi_hw_write(struct b43legacy_wldev *dev, u16 offset, s16 val)
{
b43legacy_phy_write(dev, B43legacy_PHY_NRSSILT_CTRL, offset);
- mmiowb();
b43legacy_phy_write(dev, B43legacy_PHY_NRSSILT_DATA, (u16)val);
}
diff --git a/drivers/net/wireless/broadcom/b43legacy/sysfs.c b/drivers/net/wireless/broadcom/b43legacy/sysfs.c
index 2a1da15c913b..2db83eec7a11 100644
--- a/drivers/net/wireless/broadcom/b43legacy/sysfs.c
+++ b/drivers/net/wireless/broadcom/b43legacy/sysfs.c
@@ -143,7 +143,6 @@ static ssize_t b43legacy_attr_interfmode_store(struct device *dev,
if (err)
b43legacyerr(wldev->wl, "Interference Mitigation not "
"supported by device\n");
- mmiowb();
spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
mutex_unlock(&wldev->wl->mutex);
diff --git a/drivers/net/wireless/intel/iwlegacy/common.h b/drivers/net/wireless/intel/iwlegacy/common.h
index b079c64ca014..986646af8dfd 100644
--- a/drivers/net/wireless/intel/iwlegacy/common.h
+++ b/drivers/net/wireless/intel/iwlegacy/common.h
@@ -2030,13 +2030,6 @@ static inline void
_il_release_nic_access(struct il_priv *il)
{
_il_clear_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
- /*
- * In above we are reading CSR_GP_CNTRL register, what will flush any
- * previous writes, but still want write, which clear MAC_ACCESS_REQ
- * bit, be performed on PCI bus before any other writes scheduled on
- * different CPUs (after we drop reg_lock).
- */
- mmiowb();
}
static inline u32
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index c4375b868901..4f5eec7e44bd 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -2067,7 +2067,6 @@ static void iwl_trans_pcie_release_nic_access(struct iwl_trans *trans,
* MAC_ACCESS_REQ bit to be performed before any other writes
* scheduled on different CPUs (after we drop reg_lock).
*/
- mmiowb();
out:
spin_unlock_irqrestore(&trans_pcie->reg_lock, *flags);
}
diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c
index 1dede87dd54f..dcf234680535 100644
--- a/drivers/ntb/hw/idt/ntb_hw_idt.c
+++ b/drivers/ntb/hw/idt/ntb_hw_idt.c
@@ -358,8 +358,6 @@ static void idt_sw_write(struct idt_ntb_dev *ndev,
iowrite32((u32)reg, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASAADDR);
/* Put the new value of the register */
iowrite32(data, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASADATA);
- /* Make sure the PCIe transactions are executed */
- mmiowb();
/* Unlock GASA registers operations */
spin_unlock_irqrestore(&ndev->gasa_lock, irqflags);
}
@@ -750,7 +748,6 @@ static void idt_ntb_local_link_enable(struct idt_ntb_dev *ndev)
spin_lock_irqsave(&ndev->mtbl_lock, irqflags);
idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part);
idt_nt_write(ndev, IDT_NT_NTMTBLDATA, mtbldata);
- mmiowb();
spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags);
/* Notify the peers by setting and clearing the global signal bit */
@@ -778,7 +775,6 @@ static void idt_ntb_local_link_disable(struct idt_ntb_dev *ndev)
spin_lock_irqsave(&ndev->mtbl_lock, irqflags);
idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part);
idt_nt_write(ndev, IDT_NT_NTMTBLDATA, 0);
- mmiowb();
spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags);
/* Notify the peers by setting and clearing the global signal bit */
@@ -1339,7 +1335,6 @@ static int idt_ntb_peer_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx,
idt_nt_write(ndev, IDT_NT_LUTLDATA, (u32)addr);
idt_nt_write(ndev, IDT_NT_LUTMDATA, (u32)(addr >> 32));
idt_nt_write(ndev, IDT_NT_LUTUDATA, data);
- mmiowb();
spin_unlock_irqrestore(&ndev->lut_lock, irqflags);
/* Limit address isn't specified since size is fixed for LUT */
}
@@ -1393,7 +1388,6 @@ static int idt_ntb_peer_mw_clear_trans(struct ntb_dev *ntb, int pidx,
idt_nt_write(ndev, IDT_NT_LUTLDATA, 0);
idt_nt_write(ndev, IDT_NT_LUTMDATA, 0);
idt_nt_write(ndev, IDT_NT_LUTUDATA, 0);
- mmiowb();
spin_unlock_irqrestore(&ndev->lut_lock, irqflags);
}
@@ -1812,7 +1806,6 @@ static int idt_ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx,
/* Set the route and send the data */
idt_sw_write(ndev, partdata_tbl[ndev->part].msgctl[midx], swpmsgctl);
idt_nt_write(ndev, ntdata_tbl.msgs[midx].out, msg);
- mmiowb();
/* Unlock the messages routing table */
spin_unlock_irqrestore(&ndev->msg_locks[midx], irqflags);
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 2a9d6b0d1f19..11a6cd374004 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -284,11 +284,9 @@ static int perf_spad_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
ntb_peer_spad_write(perf->ntb, peer->pidx,
PERF_SPAD_HDATA(perf->gidx),
upper_32_bits(data));
- mmiowb();
ntb_peer_spad_write(perf->ntb, peer->pidx,
PERF_SPAD_CMD(perf->gidx),
cmd);
- mmiowb();
ntb_peer_db_set(perf->ntb, PERF_SPAD_NOTIFY(peer->gidx));
dev_dbg(&perf->ntb->dev, "DB ring peer %#llx\n",
@@ -379,7 +377,6 @@ static int perf_msg_cmd_send(struct perf_peer *peer, enum perf_cmd cmd,
ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_HDATA,
upper_32_bits(data));
- mmiowb();
/* This call shall trigger peer message event */
ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_CMD, cmd);
diff --git a/drivers/scsi/bfa/bfa.h b/drivers/scsi/bfa/bfa.h
index 0e119d838e1b..762cb77253b9 100644
--- a/drivers/scsi/bfa/bfa.h
+++ b/drivers/scsi/bfa/bfa.h
@@ -62,8 +62,7 @@ void bfa_isr_unhandled(struct bfa_s *bfa, struct bfi_msg_s *m);
((__bfa)->iocfc.cfg.drvcfg.num_reqq_elems - 1); \
writel((__bfa)->iocfc.req_cq_pi[__reqq], \
(__bfa)->iocfc.bfa_regs.cpe_q_pi[__reqq]); \
- mmiowb(); \
- } while (0)
+ } while (0)
#define bfa_rspq_pi(__bfa, __rspq) \
(*(u32 *)((__bfa)->iocfc.rsp_cq_shadow_pi[__rspq].kva))
diff --git a/drivers/scsi/bfa/bfa_hw_cb.c b/drivers/scsi/bfa/bfa_hw_cb.c
index c4a0c0eb88a5..4a0d881b2602 100644
--- a/drivers/scsi/bfa/bfa_hw_cb.c
+++ b/drivers/scsi/bfa/bfa_hw_cb.c
@@ -61,7 +61,6 @@ bfa_hwcb_rspq_ack_msix(struct bfa_s *bfa, int rspq, u32 ci)
bfa_rspq_ci(bfa, rspq) = ci;
writel(ci, bfa->iocfc.bfa_regs.rme_q_ci[rspq]);
- mmiowb();
}
void
@@ -72,7 +71,6 @@ bfa_hwcb_rspq_ack(struct bfa_s *bfa, int rspq, u32 ci)
bfa_rspq_ci(bfa, rspq) = ci;
writel(ci, bfa->iocfc.bfa_regs.rme_q_ci[rspq]);
- mmiowb();
}
void
diff --git a/drivers/scsi/bfa/bfa_hw_ct.c b/drivers/scsi/bfa/bfa_hw_ct.c
index b0ff378dece2..b7be5f4f02a5 100644
--- a/drivers/scsi/bfa/bfa_hw_ct.c
+++ b/drivers/scsi/bfa/bfa_hw_ct.c
@@ -81,7 +81,6 @@ bfa_hwct_rspq_ack(struct bfa_s *bfa, int rspq, u32 ci)
bfa_rspq_ci(bfa, rspq) = ci;
writel(ci, bfa->iocfc.bfa_regs.rme_q_ci[rspq]);
- mmiowb();
}
/*
@@ -94,7 +93,6 @@ bfa_hwct2_rspq_ack(struct bfa_s *bfa, int rspq, u32 ci)
{
bfa_rspq_ci(bfa, rspq) = ci;
writel(ci, bfa->iocfc.bfa_regs.rme_q_ci[rspq]);
- mmiowb();
}
void
diff --git a/drivers/scsi/bnx2fc/bnx2fc_hwi.c b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
index 039328d9ef13..19734ec7f42e 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_hwi.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_hwi.c
@@ -991,7 +991,6 @@ void bnx2fc_arm_cq(struct bnx2fc_rport *tgt)
FCOE_CQE_TOGGLE_BIT_SHIFT);
msg = *((u32 *)rx_db);
writel(cpu_to_le32(msg), tgt->ctx_base);
- mmiowb();
}
@@ -1409,7 +1408,6 @@ void bnx2fc_ring_doorbell(struct bnx2fc_rport *tgt)
(tgt->sq_curr_toggle_bit << 15);
msg = *((u32 *)sq_db);
writel(cpu_to_le32(msg), tgt->ctx_base);
- mmiowb();
}
diff --git a/drivers/scsi/bnx2i/bnx2i_hwi.c b/drivers/scsi/bnx2i/bnx2i_hwi.c
index fae6f71e677d..12666313b937 100644
--- a/drivers/scsi/bnx2i/bnx2i_hwi.c
+++ b/drivers/scsi/bnx2i/bnx2i_hwi.c
@@ -253,7 +253,6 @@ void bnx2i_put_rq_buf(struct bnx2i_conn *bnx2i_conn, int count)
writew(ep->qp.rq_prod_idx,
ep->qp.ctx_base + CNIC_RECV_DOORBELL);
}
- mmiowb();
}
@@ -279,8 +278,6 @@ static void bnx2i_ring_sq_dbell(struct bnx2i_conn *bnx2i_conn, int count)
bnx2i_ring_577xx_doorbell(bnx2i_conn);
} else
writew(count, ep->qp.ctx_base + CNIC_SEND_DOORBELL);
-
- mmiowb(); /* flush posted PCI writes */
}
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 293f5cf524d7..59a6546fd602 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -815,7 +815,6 @@ megasas_fire_cmd_skinny(struct megasas_instance *instance,
&(regs)->inbound_high_queue_port);
writel((lower_32_bits(frame_phys_addr) | (frame_count<<1))|1,
&(regs)->inbound_low_queue_port);
- mmiowb();
spin_unlock_irqrestore(&instance->hba_lock, flags);
}
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 1d17128030cd..e35c2b64c145 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -242,7 +242,6 @@ megasas_fire_cmd_fusion(struct megasas_instance *instance,
&instance->reg_set->inbound_low_queue_port);
writel(le32_to_cpu(req_desc->u.high),
&instance->reg_set->inbound_high_queue_port);
- mmiowb();
spin_unlock_irqrestore(&instance->hba_lock, flags);
#endif
}
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 1d8c584ec1e9..f60b9e0a6ca6 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -3333,7 +3333,6 @@ _base_mpi_ep_writeq(__u64 b, volatile void __iomem *addr,
spin_lock_irqsave(writeq_lock, flags);
__raw_writel((u32)(b), addr);
__raw_writel((u32)(b >> 32), (addr + 4));
- mmiowb();
spin_unlock_irqrestore(writeq_lock, flags);
}
diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index 6ca583bdde23..53e8221f6816 100644
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -807,7 +807,6 @@ void qedf_ring_doorbell(struct qedf_rport *fcport)
writel(*(u32 *)&dbell, fcport->p_doorbell);
/* Make sure SQ index is updated so f/w prcesses requests in order */
wmb();
- mmiowb();
}
static void qedf_trace_io(struct qedf_rport *fcport, struct qedf_ioreq *io_req,
diff --git a/drivers/scsi/qedi/qedi_fw.c b/drivers/scsi/qedi/qedi_fw.c
index e2a995a6e8e7..f8f86774f77f 100644
--- a/drivers/scsi/qedi/qedi_fw.c
+++ b/drivers/scsi/qedi/qedi_fw.c
@@ -985,7 +985,6 @@ static void qedi_ring_doorbell(struct qedi_conn *qedi_conn)
* others they are two different assembly operations.
*/
wmb();
- mmiowb();
QEDI_INFO(&qedi_conn->qedi->dbg_ctx, QEDI_LOG_MP_REQ,
"prod_idx=0x%x, fw_prod_idx=0x%x, cid=0x%x\n",
qedi_conn->ep->sq_prod_idx, qedi_conn->ep->fw_sq_prod_idx,
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 6856dfdfa473..327eff67a1ee 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -3004,8 +3004,6 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
sp->flags |= SRB_SENT;
ha->actthreads++;
WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);
- /* Enforce mmio write ordering; see comment in qla1280_isp_cmd(). */
- mmiowb();
out:
if (status)
@@ -3254,8 +3252,6 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
sp->flags |= SRB_SENT;
ha->actthreads++;
WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);
- /* Enforce mmio write ordering; see comment in qla1280_isp_cmd(). */
- mmiowb();
out:
if (status)
@@ -3367,19 +3363,8 @@ qla1280_isp_cmd(struct scsi_qla_host *ha)
/*
* Update request index to mailbox4 (Request Queue In).
- * The mmiowb() ensures that this write is ordered with writes by other
- * CPUs. Without the mmiowb(), it is possible for the following:
- * CPUA posts write of index 5 to mailbox4
- * CPUA releases host lock
- * CPUB acquires host lock
- * CPUB posts write of index 6 to mailbox4
- * On PCI bus, order reverses and write of 6 posts, then index 5,
- * causing chip to issue full queue of stale commands
- * The mmiowb() prevents future writes from crossing the barrier.
- * See Documentation/driver-api/device-io.rst for more information.
*/
WRT_REG_WORD(&reg->mailbox4, ha->req_ring_index);
- mmiowb();
LEAVE("qla1280_isp_cmd");
}
diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index 84807a9b4b13..da2d2ab8104d 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -305,7 +305,6 @@ static int sprom_do_write(struct ssb_bus *bus, const u16 *sprom)
else if (i % 2)
pr_cont(".");
writew(sprom[i], bus->mmio + bus->sprom_offset + (i * 2));
- mmiowb();
msleep(20);
}
err = pci_read_config_dword(pdev, SSB_SPROMCTL, &spromctl);
diff --git a/drivers/ssb/pcmcia.c b/drivers/ssb/pcmcia.c
index 567013f8a8be..d7d730c245c5 100644
--- a/drivers/ssb/pcmcia.c
+++ b/drivers/ssb/pcmcia.c
@@ -338,7 +338,6 @@ static void ssb_pcmcia_write8(struct ssb_device *dev, u16 offset, u8 value)
err = select_core_and_segment(dev, &offset);
if (likely(!err))
writeb(value, bus->mmio + offset);
- mmiowb();
spin_unlock_irqrestore(&bus->bar_lock, flags);
}
@@ -352,7 +351,6 @@ static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
err = select_core_and_segment(dev, &offset);
if (likely(!err))
writew(value, bus->mmio + offset);
- mmiowb();
spin_unlock_irqrestore(&bus->bar_lock, flags);
}
@@ -368,7 +366,6 @@ static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
writew((value & 0x0000FFFF), bus->mmio + offset);
writew(((value & 0xFFFF0000) >> 16), bus->mmio + offset + 2);
}
- mmiowb();
spin_unlock_irqrestore(&bus->bar_lock, flags);
}
@@ -424,7 +421,6 @@ static void ssb_pcmcia_block_write(struct ssb_device *dev, const void *buffer,
WARN_ON(1);
}
unlock:
- mmiowb();
spin_unlock_irqrestore(&bus->bar_lock, flags);
}
#endif /* CONFIG_SSB_BLOCKIO */
diff --git a/drivers/staging/comedi/drivers/mite.c b/drivers/staging/comedi/drivers/mite.c
index 61e03ad84123..639ec1586976 100644
--- a/drivers/staging/comedi/drivers/mite.c
+++ b/drivers/staging/comedi/drivers/mite.c
@@ -371,7 +371,6 @@ static unsigned int mite_get_status(struct mite_channel *mite_chan)
writel(CHOR_CLRDONE,
mite->mmio + MITE_CHOR(mite_chan->channel));
}
- mmiowb();
spin_unlock_irqrestore(&mite->lock, flags);
return status;
}
@@ -451,7 +450,6 @@ void mite_dma_arm(struct mite_channel *mite_chan)
mite_chan->done = 0;
/* arm */
writel(CHOR_START, mite->mmio + MITE_CHOR(mite_chan->channel));
- mmiowb();
spin_unlock_irqrestore(&mite->lock, flags);
}
EXPORT_SYMBOL_GPL(mite_dma_arm);
@@ -638,7 +636,6 @@ void mite_release_channel(struct mite_channel *mite_chan)
CHCR_CLR_LC_IE | CHCR_CLR_CONT_RB_IE,
mite->mmio + MITE_CHCR(mite_chan->channel));
mite_chan->ring = NULL;
- mmiowb();
}
spin_unlock_irqrestore(&mite->lock, flags);
}
diff --git a/drivers/staging/comedi/drivers/ni_660x.c b/drivers/staging/comedi/drivers/ni_660x.c
index 405573e927cf..4ee9b260eab0 100644
--- a/drivers/staging/comedi/drivers/ni_660x.c
+++ b/drivers/staging/comedi/drivers/ni_660x.c
@@ -320,7 +320,6 @@ static inline void ni_660x_set_dma_channel(struct comedi_device *dev,
ni_660x_write(dev, chip, devpriv->dma_cfg[chip] |
NI660X_DMA_CFG_RESET(mite_channel),
NI660X_DMA_CFG);
- mmiowb();
}
static inline void ni_660x_unset_dma_channel(struct comedi_device *dev,
@@ -333,7 +332,6 @@ static inline void ni_660x_unset_dma_channel(struct comedi_device *dev,
devpriv->dma_cfg[chip] &= ~NI660X_DMA_CFG_SEL_MASK(mite_channel);
devpriv->dma_cfg[chip] |= NI660X_DMA_CFG_SEL_NONE(mite_channel);
ni_660x_write(dev, chip, devpriv->dma_cfg[chip], NI660X_DMA_CFG);
- mmiowb();
}
static int ni_660x_request_mite_channel(struct comedi_device *dev,
diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index b04dad8c7092..668f2aa16baa 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -547,7 +547,6 @@ static inline void ni_set_bitfield(struct comedi_device *dev, int reg,
reg);
break;
}
- mmiowb();
spin_unlock_irqrestore(&devpriv->soft_reg_copy_lock, flags);
}
diff --git a/drivers/staging/comedi/drivers/ni_pcidio.c b/drivers/staging/comedi/drivers/ni_pcidio.c
index 4bdef87d5dd7..8f3864799c19 100644
--- a/drivers/staging/comedi/drivers/ni_pcidio.c
+++ b/drivers/staging/comedi/drivers/ni_pcidio.c
@@ -310,7 +310,6 @@ static int ni_pcidio_request_di_mite_channel(struct comedi_device *dev)
writeb(primary_DMAChannel_bits(devpriv->di_mite_chan->channel) |
secondary_DMAChannel_bits(devpriv->di_mite_chan->channel),
dev->mmio + DMA_LINE_CONTROL_GROUP1);
- mmiowb();
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
return 0;
}
@@ -327,7 +326,6 @@ static void ni_pcidio_release_di_mite_channel(struct comedi_device *dev)
writeb(primary_DMAChannel_bits(0) |
secondary_DMAChannel_bits(0),
dev->mmio + DMA_LINE_CONTROL_GROUP1);
- mmiowb();
}
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
}
diff --git a/drivers/staging/comedi/drivers/ni_tio.c b/drivers/staging/comedi/drivers/ni_tio.c
index 048cb35723ad..c1131a1622c0 100644
--- a/drivers/staging/comedi/drivers/ni_tio.c
+++ b/drivers/staging/comedi/drivers/ni_tio.c
@@ -234,7 +234,6 @@ static void ni_tio_set_bits_transient(struct ni_gpct *counter,
regs[reg] &= ~mask;
regs[reg] |= (value & mask);
ni_tio_write(counter, regs[reg] | transient, reg);
- mmiowb();
spin_unlock_irqrestore(&counter_dev->regs_lock, flags);
}
}
diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index f5af6f4069dc..39049d3c56d7 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -108,7 +108,6 @@ static void s626_mc_enable(struct comedi_device *dev,
{
unsigned int val = (cmd << 16) | cmd;
- mmiowb();
writel(val, dev->mmio + reg);
}
@@ -116,7 +115,6 @@ static void s626_mc_disable(struct comedi_device *dev,
unsigned int cmd, unsigned int reg)
{
writel(cmd << 16, dev->mmio + reg);
- mmiowb();
}
static bool s626_mc_test(struct comedi_device *dev,
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index ef89534dd760..e5d3ebab6dae 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -353,7 +353,6 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n);
xmit->tail = (xmit->tail + n) & (UART_XMIT_SIZE - 1);
- mmiowb();
iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index 1b4008d022bf..d22ccb32aa9b 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -248,7 +248,6 @@ static void serial_txx9_initialize(struct uart_port *port)
sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
/* TX4925 BUG WORKAROUND. Accessing SIOC register
* immediately after soft reset causes bus error. */
- mmiowb();
udelay(1);
while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
udelay(1);
diff --git a/drivers/usb/early/xhci-dbc.c b/drivers/usb/early/xhci-dbc.c
index c9cfb100ecdc..cac991173ac0 100644
--- a/drivers/usb/early/xhci-dbc.c
+++ b/drivers/usb/early/xhci-dbc.c
@@ -533,8 +533,6 @@ static int xdbc_handle_external_reset(void)
xdbc_mem_init();
- mmiowb();
-
ret = xdbc_start();
if (ret < 0)
goto reset_out;
@@ -587,8 +585,6 @@ static int __init xdbc_early_setup(void)
xdbc_mem_init();
- mmiowb();
-
ret = xdbc_start();
if (ret < 0) {
writel(0, &xdbc.xdbc_reg->control);
diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index d932cc31711e..52e32644a4b2 100644
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -421,8 +421,6 @@ static int xhci_dbc_mem_init(struct xhci_hcd *xhci, gfp_t flags)
string_length = xhci_dbc_populate_strings(dbc->string);
xhci_dbc_init_contexts(xhci, string_length);
- mmiowb();
-
xhci_dbc_eps_init(xhci);
dbc->state = DS_INITIALIZED;
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 303871651f8a..8f3bf95a36d1 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -19,12 +19,9 @@
#include <asm-generic/iomap.h>
#endif
+#include <asm/mmiowb.h>
#include <asm-generic/pci_iomap.h>
-#ifndef mmiowb
-#define mmiowb() do {} while (0)
-#endif
-
#ifndef __io_br
#define __io_br() barrier()
#endif
@@ -49,7 +46,7 @@
/* serialize device access against a spin_unlock, usually handled there. */
#ifndef __io_aw
-#define __io_aw() barrier()
+#define __io_aw() mmiowb_set_pending()
#endif
#ifndef __io_pbw
diff --git a/include/asm-generic/mmiowb.h b/include/asm-generic/mmiowb.h
new file mode 100644
index 000000000000..9439ff037b2d
--- /dev/null
+++ b/include/asm-generic/mmiowb.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_GENERIC_MMIOWB_H
+#define __ASM_GENERIC_MMIOWB_H
+
+/*
+ * Generic implementation of mmiowb() tracking for spinlocks.
+ *
+ * If your architecture doesn't ensure that writes to an I/O peripheral
+ * within two spinlocked sections on two different CPUs are seen by the
+ * peripheral in the order corresponding to the lock handover, then you
+ * need to follow these FIVE easy steps:
+ *
+ * 1. Implement mmiowb() (and arch_mmiowb_state() if you're fancy)
+ * in asm/mmiowb.h, then #include this file
+ * 2. Ensure your I/O write accessors call mmiowb_set_pending()
+ * 3. Select ARCH_HAS_MMIOWB
+ * 4. Untangle the resulting mess of header files
+ * 5. Complain to your architects
+ */
+#ifdef CONFIG_MMIOWB
+
+#include <linux/compiler.h>
+#include <asm-generic/mmiowb_types.h>
+
+#ifndef arch_mmiowb_state
+#include <asm/percpu.h>
+#include <asm/smp.h>
+
+DECLARE_PER_CPU(struct mmiowb_state, __mmiowb_state);
+#define __mmiowb_state() this_cpu_ptr(&__mmiowb_state)
+#else
+#define __mmiowb_state() arch_mmiowb_state()
+#endif /* arch_mmiowb_state */
+
+static inline void mmiowb_set_pending(void)
+{
+ struct mmiowb_state *ms = __mmiowb_state();
+ ms->mmiowb_pending = ms->nesting_count;
+}
+
+static inline void mmiowb_spin_lock(void)
+{
+ struct mmiowb_state *ms = __mmiowb_state();
+ ms->nesting_count++;
+}
+
+static inline void mmiowb_spin_unlock(void)
+{
+ struct mmiowb_state *ms = __mmiowb_state();
+
+ if (unlikely(ms->mmiowb_pending)) {
+ ms->mmiowb_pending = 0;
+ mmiowb();
+ }
+
+ ms->nesting_count--;
+}
+#else
+#define mmiowb_set_pending() do { } while (0)
+#define mmiowb_spin_lock() do { } while (0)
+#define mmiowb_spin_unlock() do { } while (0)
+#endif /* CONFIG_MMIOWB */
+#endif /* __ASM_GENERIC_MMIOWB_H */
diff --git a/include/asm-generic/mmiowb_types.h b/include/asm-generic/mmiowb_types.h
new file mode 100644
index 000000000000..8eb0095655e7
--- /dev/null
+++ b/include/asm-generic/mmiowb_types.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_GENERIC_MMIOWB_TYPES_H
+#define __ASM_GENERIC_MMIOWB_TYPES_H
+
+#include <linux/types.h>
+
+struct mmiowb_state {
+ u16 nesting_count;
+ u16 mmiowb_pending;
+};
+
+#endif /* __ASM_GENERIC_MMIOWB_TYPES_H */
diff --git a/include/linux/qed/qed_if.h b/include/linux/qed/qed_if.h
index f6165d304b4d..48841e5dab90 100644
--- a/include/linux/qed/qed_if.h
+++ b/include/linux/qed/qed_if.h
@@ -1338,7 +1338,6 @@ static inline u16 qed_sb_update_sb_idx(struct qed_sb_info *sb_info)
}
/* Let SB update */
- mmiowb();
return rc;
}
@@ -1374,7 +1373,6 @@ static inline void qed_sb_ack(struct qed_sb_info *sb_info,
/* Both segments (interrupts & acks) are written to same place address;
* Need to guarantee all commands will be received (in-order) by HW.
*/
- mmiowb();
barrier();
}
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index e089157dcf97..ed7c4d6b8235 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -57,6 +57,7 @@
#include <linux/stringify.h>
#include <linux/bottom_half.h>
#include <asm/barrier.h>
+#include <asm/mmiowb.h>
/*
@@ -178,6 +179,7 @@ static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock)
{
__acquire(lock);
arch_spin_lock(&lock->raw_lock);
+ mmiowb_spin_lock();
}
#ifndef arch_spin_lock_flags
@@ -189,15 +191,22 @@ do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lo
{
__acquire(lock);
arch_spin_lock_flags(&lock->raw_lock, *flags);
+ mmiowb_spin_lock();
}
static inline int do_raw_spin_trylock(raw_spinlock_t *lock)
{
- return arch_spin_trylock(&(lock)->raw_lock);
+ int ret = arch_spin_trylock(&(lock)->raw_lock);
+
+ if (ret)
+ mmiowb_spin_lock();
+
+ return ret;
}
static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
{
+ mmiowb_spin_unlock();
arch_spin_unlock(&lock->raw_lock);
__release(lock);
}
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index e335953fa704..bf770d7556f7 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -251,3 +251,10 @@ config ARCH_USE_QUEUED_RWLOCKS
config QUEUED_RWLOCKS
def_bool y if ARCH_USE_QUEUED_RWLOCKS
depends on SMP
+
+config ARCH_HAS_MMIOWB
+ bool
+
+config MMIOWB
+ def_bool y if ARCH_HAS_MMIOWB
+ depends on SMP
diff --git a/kernel/locking/spinlock.c b/kernel/locking/spinlock.c
index 936f3d14dd6b..0ff08380f531 100644
--- a/kernel/locking/spinlock.c
+++ b/kernel/locking/spinlock.c
@@ -22,6 +22,13 @@
#include <linux/debug_locks.h>
#include <linux/export.h>
+#ifdef CONFIG_MMIOWB
+#ifndef arch_mmiowb_state
+DEFINE_PER_CPU(struct mmiowb_state, __mmiowb_state);
+EXPORT_PER_CPU_SYMBOL(__mmiowb_state);
+#endif
+#endif
+
/*
* If lockdep is enabled then we use the non-preemption spin-ops
* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
diff --git a/kernel/locking/spinlock_debug.c b/kernel/locking/spinlock_debug.c
index 9aa0fccd5d43..399669f7eba8 100644
--- a/kernel/locking/spinlock_debug.c
+++ b/kernel/locking/spinlock_debug.c
@@ -111,6 +111,7 @@ void do_raw_spin_lock(raw_spinlock_t *lock)
{
debug_spin_lock_before(lock);
arch_spin_lock(&lock->raw_lock);
+ mmiowb_spin_lock();
debug_spin_lock_after(lock);
}
@@ -118,8 +119,10 @@ int do_raw_spin_trylock(raw_spinlock_t *lock)
{
int ret = arch_spin_trylock(&lock->raw_lock);
- if (ret)
+ if (ret) {
+ mmiowb_spin_lock();
debug_spin_lock_after(lock);
+ }
#ifndef CONFIG_SMP
/*
* Must not happen on UP:
@@ -131,6 +134,7 @@ int do_raw_spin_trylock(raw_spinlock_t *lock)
void do_raw_spin_unlock(raw_spinlock_t *lock)
{
+ mmiowb_spin_unlock();
debug_spin_unlock(lock);
arch_spin_unlock(&lock->raw_lock);
}
diff --git a/sound/soc/txx9/txx9aclc-ac97.c b/sound/soc/txx9/txx9aclc-ac97.c
index 1cfca698ae4b..b0fa285c7ba2 100644
--- a/sound/soc/txx9/txx9aclc-ac97.c
+++ b/sound/soc/txx9/txx9aclc-ac97.c
@@ -102,7 +102,6 @@ static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;
__raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
- mmiowb();
udelay(1);
__raw_writel(ACCTL_ENLINK, base + ACCTLEN);
/* wait for primary codec ready status */