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2011-12-08powerpc/kdump: Only save CPU state first time through the secondary CPU ↵Anton Blanchard
capture code We might enter the secondary CPU capture code twice, eg if we have to unstick some CPUs with a system reset. In this case we don't want to overwrite the state on CPUs that had made it into the capture code OK, so use the cpus_state_saved cpumask for that and make it local to crash_ipi_callback. For controlling progress now use atomic_t cpus_in_crash to count how many CPUs have made it into the kdump code, and time_to_dump to tell everyone it's time to dump. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc/kdump: Delay before sending IPI on a system resetAnton Blanchard
If we enter the kdump code via system reset, wait a bit before sending the IPI to capture all secondary CPUs. Without it we race with the hypervisor that is issuing the system reset to each CPU. If the IPI gets there first the system reset oops output then shows the register state of the IPI handler which is not what we want. I took the opportunity to add defines for all the various delays we have. There's no need for cpu_relax when we are doing an mdelay, so remove them too. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc/xics: Reset the CPPR if H_EOI failsAnton Blanchard
I have an intermittent kdump fail where the hypervisor fails an H_EOI. As a result our CPPR is never reset to 0xff and we no longer accept interrupts. This patch calls icp_hv_set_cppr to reset the CPPR if H_EOI fails, fixing the kdump fail. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc: Reduce pseries panic timeout from 180s to 10sAnton Blanchard
We've had a 180 second panic timeout on ppc64 for as long as I can remember. This patch reduces it to 10 seconds on pseries for a few reasons: - Almost all pseries machines have a hypervisor console so panic output will be available in a scrollback buffer. - The 180 seconds impacts our availability, users (other than kernel hackers) just want the box to come back around so it can continue its work. - I spend a lot of my life staring at the 180 second panic timeout. Many pseries machines take minutes to power cycle, so it's quicker to sit through the 180 seconds than it is to power cycle. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc: Rework die()Anton Blanchard
Our die() code was based off a very old x86 version. Update it to mirror the current x86 code. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc: Cleanup crash/kexec codeAnton Blanchard
Remove some unnecessary defines and fix some spelling mistakes. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc/kdump: Use setjmp/longjmp to handle kdump and system reset recursionAnton Blanchard
We can handle recursion caused by system reset by reusing the crash shutdown fault handler. Since we don't have an OS triggerable NMI, if all CPUs don't make it into kdump then we tell the user to issue a system reset. However if we have a panic timeout set we cannot wait forever and must continue the kdump. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc: Remove broken and complicated kdump system reset codeAnton Blanchard
We have a lot of complicated logic that handles possible recursion between kdump and a system reset exception. We can solve this in a much simpler way using the same setjmp/longjmp tricks xmon does. As a first step, this patch removes the old system reset code. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08powerpc: Give us time to get all oopses out before panickingAnton Blanchard
I've been seeing truncated output when people send system reset info to me. We should see a backtrace for every CPU, but the panic() code takes the box down before they all make it out to the console. The panic code runs unlocked so we also see corrupted console output. If we are going to panic, then delay 1 second before calling into the panic code. Move oops_exit inside the die lock and put a newline between oopses for clarity. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-08Merge branch 'booke-hugetlb' into nextBenjamin Herrenschmidt
2011-12-07Merge branch 'mpic' into nextBenjamin Herrenschmidt
2011-12-07powerpc/pci: Make pci_read_irq_line() staticBenjamin Herrenschmidt
It's only used inside the same file where it's defined. There's also no point exporting it anymore. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/powernv: Workaround OFW issues in prom_init.cBenjamin Herrenschmidt
Open Firmware on OPAL machines seems to have issues if we close stdin and/or we try to print things after calling "quiesce" so we avoid doing both. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/powernv: Display diag data on p7ioc EEH errorsBenjamin Herrenschmidt
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/powernv: Update OPAL interfacesBenjamin Herrenschmidt
This adds some more interfaces for OPAL v2 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Define/use HUGETLB_NEED_PRELOAD insead of complicated #ifBecky Bruce
Define HUGETLB_NEED_PRELOAD in mmu-book3e.h for CONFIG_PPC64 instead of having a much more complicated #if block. This is easier to read and maintain. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/book3e: Change hugetlb preload to take vma argumentBecky Bruce
This avoids an extra find_vma() and is less error-prone. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Enable hugetlb by default for corenet64 platformsBecky Bruce
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Enable Hugetlb by default for 32-bit 85xx/corenetBecky Bruce
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Kconfig updates for FSL BookE HUGETLB 64-bitBecky Bruce
Allow hugetlb to be enabled on 64b FSL_BOOK3E. No platforms enable it by default yet. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Add gpages reservation code for 64-bit FSL BOOKEBecky Bruce
For 64-bit FSL_BOOKE implementations, gigantic pages need to be reserved at boot time by the memblock code based on the command line. This adds the call that handles the reservation, and fixes some code comments. It also removes the previous pr_err when reserve_hugetlb_gpages is called on a system without hugetlb enabled - the way the code is structured, the call is unconditional and the resulting error message spurious and confusing. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Add hugepage support to 64-bit tablewalk code for FSL_BOOK3EBecky Bruce
Before hugetlb, at each level of the table, we test for !0 to determine if we have a valid table entry. With hugetlb, this compare becomes: < 0 is a normal entry 0 is an invalid entry > 0 is huge This works because the hugepage code pulls the top bit off the entry (which for non-huge entries always has the top bit set) as an indicator that we have a hugepage. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Whitespace/comment changes to tlb_low_64e.SBecky Bruce
I happened to comment this code while I was digging through it; we might as well commit that. I also made some whitespace changes - the existing code had a lot of unnecessary newlines that I found annoying when I was working on my tiny laptop. No functional changes. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: hugetlb: modify include usage for FSL BookE codeBecky Bruce
The original 32-bit hugetlb implementation used PPC64 vs PPC32 to determine which code path to take. However, the final hugetlb implementation for 64-bit FSL ended up shared with the FSL 32-bit code so the actual check needs to be FSL_BOOK3E vs everything else. This patch changes the include protections to reflect this. There are also a couple of related comment fixes. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Update hugetlb huge_pte_alloc and tablewalk code for FSL BOOKEBecky Bruce
This updates the hugetlb page table code to handle 64-bit FSL_BOOKE. The previous 32-bit work counted on the inner levels of the page table collapsing. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Fix booke hugetlb preload code for PPC_MM_SLICES and 64-bitBecky Bruce
This patch does 2 things: It corrects the code that determines the size to write into MAS1 for the PPC_MM_SLICES case (this originally came from David Gibson and I had incorrectly altered it), and it changes the methodolody used to calculate the size for !PPC_MM_SLICES to work for 64-bit as well as 32-bit. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: hugetlb: fix huge_ptep_set_access_flags return valueBecky Bruce
There was an unconditional return of "1" in the original code from David Gibson, and I dropped it because it wasn't needed for FSL BOOKE 32-bit. However, not all systems (including 64-bit FSL BOOKE) do loading of the hpte from the fault handler asm and depend on this function returning 1, which causes a call to update_mmu_cache() that writes an entry into the tlb. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Only define HAVE_ARCH_HUGETLB_UNMAPPED_AREA if PPC_MM_SLICESBecky Bruce
If we don't have slices, we should be able to use the generic hugetlb_get_unmapped_area() code Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Add in-core support for cascaded MPICsKyle Moffett
The Cell and PowerMac platforms use virtually identical cascaded-IRQ setup code, so just merge it into the core. Ideally this code would trigger automatically when an MPIC device-node specifies an "interrupts" property, perhaps even enabling MPIC_SECONDARY along the way. Unfortunately, Benjamin Herrenschmidt has had bad experiences in the past with the quality of Apple PowerMac device-trees, so to be safe we will only try to parse out an IRQ if the MPIC_SECONDARY flag is set by the caller. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Cache the device-tree node in "struct mpic"Kyle Moffett
Store the node pointer in the MPIC during initialization so that all of the later operational code can just reuse the cached pointer. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Put "pic-no-reset" test back into the MPIC codeKyle Moffett
There's not really any reason to have this one-liner in a separate static inline function, given that all the other similar tests are already in the alloc_mpic() code. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Don't open-code dcr_resource_startKyle Moffett
Don't open-code the OpenFirmware "dcr-reg" property lookup trying to map DCR resources. This makes the code a bit easier to read. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Invert the meaning of MPIC_PRIMARYKyle Moffett
It turns out that there are only 2 in-tree platforms which use MPICs which are not "primary": IBM Cell and PowerMac. To reduce the complexity of the typical board setup code, invert the MPIC_PRIMARY bit into MPIC_SECONDARY. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Search for open-pic device-tree node if NULLKyle Moffett
Almost all PowerPC platforms use a standard "open-pic" device node so the mpic_alloc() function now accepts NULL for the device-node. This will cause it to perform a default search with of_find_matching_node(). Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Save computed phys_addr for board-specific codeKyle Moffett
The MPIC code can already perform an automatic OF address translation step as part of mpic_alloc(), but several boards need to use that base address when they perform mpic_assign_isu(). The easiest solution is to save the computed physical address into the "struct mpic" for later use by the board code. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/mpic: Assume a device-node was passed in mpic_alloc()Kyle Moffett
All of the existing callers of mpic_alloc() pass in a non-NULL device-node pointer, so the checks for a NULL device-node may be removed. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc: Consolidate mpic_alloc() OF address translationKyle Moffett
Instead of using the open-coded "reg" property lookup and address translation in mpic_alloc(), directly call of_address_to_resource(). This includes various workarounds for special cases which the naive of_address_translate() does not. Afterwards it is possible to remove the copiously copy-pasted calls to of_address_translate() from the 85xx/86xx/powermac platforms. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-12-07powerpc/85xx: Move mpc85xx_smp_init() decl to a new "smp.h"Kyle Moffett
This removes a bunch of "extern" declarations and CONFIG_SMP ifdefs. Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-28powerpc+sparc64/mm: Remove hack in mmap randomize layoutDan McGee
Since commit 8a0a9bd4db63bc45e301, this comment in mmap_rnd() does not hold true as the value returned by get_random_int() will in fact be different every single call. Remove the comment and simplify the code back to its original desired form. This reverts commit a5adc91a4b44b5d1 which is no longer necessary and also fixes the sparc code that copied this same adjustment. Signed-off-by: Dan McGee <dpmcgee@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-28powerpc/xics: Harden xics hypervisor backendAnton Blanchard
During kdump stress testing I sometimes see the kdump kernel panic with: Interrupt 0x306 (real) is invalid, disabling it. Kernel panic - not syncing: bad return code EOI - rc = -4, value=ff000306 Instead of panicing print the error message, dump the stack the first time it happens and continue on. Add some more information to the debug messages as well. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-28powerpc: Decode correct MSR bits in oops outputAnton Blanchard
On a 64bit book3s machine I have an oops from a system reset that claims the book3e CE bit was set: MSR: 8000000000021032 <ME,CE,IR,DR> CR: 24004082 XER: 00000010 On a book3s machine system reset sets IBM bit 46 and 47 depending on the power saving mode. Separate the definitions by type and for completeness add the rest of the bits in. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-28arch/powerpc: Remove duplicate/redundant Altivec entriesMatthew McClintock
In lieu of having multiple similiar lines, we can just have one generic cpu-as line for CONFIG_ALTIVEC Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-28powerpc/maple: Enable access to HT Host-Bridge on MapleDmitry Eremin-Solenikov
CPC925/CPC945 use special window to access host bridge functionality of u3-ht. Provide a way to access this device. Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-28powerpc: Implement CONFIG_STRICT_DEVMEMsukadev@linux.vnet.ibm.com
As described in the help text in the patch, this token restricts general access to /dev/mem as a way of increasing the security. Specifically, access to exclusive IOMEM and kernel RAM is denied unless CONFIG_STRICT_DEVMEM is set to 'n'. Implement the 'devmem_is_allowed()' interface for Powerpc. It will be called from range_is_allowed() when userpsace attempts to access /dev/mem. This patch is based on an earlier patch from Steve Best and with input from Paul Mackerras and Scott Wood. [BenH] Fixed a typo or two and removed the generic change which should be submitted as a separate patch Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-25Merge remote-tracking branch 'kumar/next' into nextBenjamin Herrenschmidt
2011-11-25powerpc/mpic: Remove extra semicolon.Justin P. Mattock
The patch below removes an extra semicolon. Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> CC: linuxppc-dev@lists.ozlabs.org CC: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-25powerpc: Export PIR data through sysfsAnanth N Mavinakayanahalli
On Fri, Nov 11, 2011 at 10:17:55AM +0530, Ananth N Mavinakayanahalli wrote: > > > > At this rate we're going to end up with no bits left for CPU features > > way too quickly... Especially for something we only care about once at > > boot time. > > > > Wouldn't CPU_FTR_PPCAS_ARCH_V2 be a good enough test ? > > /me checks Cell manuals... yes, that test would be good enough. I will > cook up a patch to use this. Here it is... Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-25powerpc/powernv: PCI support for p7IOC under OPAL v2Benjamin Herrenschmidt
This adds support for p7IOC (and possibly other IODA v1 IO Hubs) using OPAL v2 interfaces. We completely take over resource assignment and assign them using an algorithm that hands out device BARs in a way that makes them fit in individual segments of the M32 window of the bridge, which enables us to assign individual PEs to devices and functions. The current implementation gives out a PE per functions on PCIe, and a PE for the entire bridge for PCIe to PCI-X bridges. This can be adjusted / fine tuned later. We also setup DMA resources (32-bit only for now) and MSIs (both 32-bit and 64-bit MSI are supported). The DMA allocation tries to divide the available 256M segments of the 32-bit DMA address space "fairly" among PEs. This is done using a "weight" heuristic which assigns less value to things like OHCI USB controllers than, for example SCSI RAID controllers. This algorithm will probably want some fine tuning for specific devices or device types. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-25powerpc/powernv: Fixup p7ioc PCIe root complex class codeBenjamin Herrenschmidt
It advertises "host bridge" instead of "PCI to PCI bridge" which confuses the Linux probe code. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2011-11-25powerpc/powernv: Add TCE SW invalidation supportBenjamin Herrenschmidt
This is used for newer IO Hubs such as p7IOC. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>