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authorGrant Grundler <grundler@parisc-linux.org>2005-10-21 22:37:20 -0400
committerKyle McMartin <kyle@parisc-linux.org>2005-10-21 22:37:20 -0400
commit64908ad95c34f25849412d6d4735ac10f8fb6575 (patch)
tree544173d34dadfb80339e3d4ba147875ad1f5c731 /drivers/parisc/sba_iommu.c
parent53f01bba49938f115237fe43a261c31ac13ae5c6 (diff)
downloadlinux-linaro-stable-64908ad95c34f25849412d6d4735ac10f8fb6575.tar.gz
[PARISC] Update sba_iommu from parisc tree
revert use of %%sr0 in fdc asm. Thanks to Joel Soete for pointing out this oversight. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> 2.6.14-rc2-pa3 move "sync" outside the main loop that fills IO Pdir. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> remove explicit use of sr0 in fdc ops. Thanks to Joel Soete for reminding me were I added those... Signed-off-by: Grant Grundler <grundler@parisc-linux.org> 2.6.14-rc2-pa2 - make SBA more anal about invalidating pdir entries Previous code cleared the valid flag a pdir entry but it did NOT guarantee this change was visible to the PDIR before writing the PCOM register. Ie the SBA could pick up a stale entry if the write happened to hit the SBA before the cacheline was flushed from the cache. Long term, I think I want to make this a compile time flag. Developement tree should enable anal pdir checking by default and Debian can disable it with either a CONFIG option or one-line patch. fdc/sync options can only negatively affect performance though I haven't measure how much yet. If someone can run netperf TCP_RR across gige and compare -pa1 and -pa2, that would be sufficient. Cleaned up the use of "fdc" to make sure it's using "kernel" space id (specify sr0 but maps to sr4-7). It seems a bit fragile to assume "sr1" gets loaded with KERNEL_SPACE which is how the code works today. Tested on 32 and 64-bit SMP kernels on j6k. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> remove PDC_NARROW from SBA and document history of PDC_NARROW a bit. It will still show up in an older kernel's .config file. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> if/ifdef cleanups from Joel Soete. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> 2.6.12-rc4-pa2 fix 32-bit support for Astro platforms o Since my last SBA code change, SBA could allocate more than 1GB of IOVA space on Astro boxes with more than 1GB of RAM when running 32-bit kernel. This is bad since IOMMU can only talk to the first 1GB at most. Kudos to jejb for quickly spotting that bug. o jejb also noted SBA should *always* reject DMA masks > 32-bits since DMA-mapping.txt indicates caller should try again with 32-bits. o off-by-one error when comparing the mask to IOVA space size. Signed-off-by: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'drivers/parisc/sba_iommu.c')
-rw-r--r--drivers/parisc/sba_iommu.c140
1 files changed, 91 insertions, 49 deletions
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index 6256ad365d0b..48591badd4ce 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -91,8 +91,8 @@ extern struct proc_dir_entry * proc_mckinley_root;
#define DBG_RES(x...)
#endif
-#if defined(__LP64__) && !defined(CONFIG_PDC_NARROW)
-/* "low end" PA8800 machines use ZX1 chipset */
+#if defined(CONFIG_64BIT)
+/* "low end" PA8800 machines use ZX1 chipset: PAT PDC and only run 64-bit */
#define ZX1_SUPPORT
#endif
@@ -231,7 +231,7 @@ struct ioc {
spinlock_t res_lock;
unsigned int res_bitshift; /* from the LEFT! */
unsigned int res_size; /* size of resource map in bytes */
-#if SBA_HINT_SUPPORT
+#ifdef SBA_HINT_SUPPORT
/* FIXME : DMA HINTs not used */
unsigned long hint_mask_pdir; /* bits used for DMA hints */
unsigned int hint_shift_pdir;
@@ -294,7 +294,7 @@ static unsigned long piranha_bad_128k = 0;
/* Looks nice and keeps the compiler happy */
#define SBA_DEV(d) ((struct sba_device *) (d))
-#if SBA_AGP_SUPPORT
+#ifdef SBA_AGP_SUPPORT
static int reserve_sba_gart = 1;
#endif
@@ -314,7 +314,7 @@ static int reserve_sba_gart = 1;
#define WRITE_REG32(val, addr) __raw_writel(cpu_to_le32(val), addr)
#define WRITE_REG64(val, addr) __raw_writeq(cpu_to_le64(val), addr)
-#ifdef __LP64__
+#ifdef CONFIG_64BIT
#define READ_REG(addr) READ_REG64(addr)
#define WRITE_REG(value, addr) WRITE_REG64(value, addr)
#else
@@ -324,7 +324,7 @@ static int reserve_sba_gart = 1;
#ifdef DEBUG_SBA_INIT
-/* NOTE: When __LP64__ isn't defined, READ_REG64() is two 32-bit reads */
+/* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
/**
* sba_dump_ranges - debugging only - print ranges assigned to this IOA
@@ -364,7 +364,7 @@ static void sba_dump_tlb(void __iomem *hpa)
#else
#define sba_dump_ranges(x)
#define sba_dump_tlb(x)
-#endif
+#endif /* DEBUG_SBA_INIT */
#ifdef ASSERT_PDIR_SANITY
@@ -674,7 +674,7 @@ sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
*
***************************************************************/
-#if SBA_HINT_SUPPORT
+#ifdef SBA_HINT_SUPPORT
#define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
#endif
@@ -743,9 +743,8 @@ sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
* (bit #61, big endian), we have to flush and sync every time
* IO-PDIR is changed in Ike/Astro.
*/
- if (ioc_needs_fdc) {
- asm volatile("fdc 0(%%sr1,%0)\n\tsync" : : "r" (pdir_ptr));
- }
+ if (ioc_needs_fdc)
+ asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
}
@@ -769,42 +768,57 @@ static SBA_INLINE void
sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
{
u32 iovp = (u32) SBA_IOVP(ioc,iova);
-
- /* Even though this is a big-endian machine, the entries
- ** in the iopdir are little endian. That's why we clear the byte
- ** at +7 instead of at +0.
- */
- int off = PDIR_INDEX(iovp)*sizeof(u64)+7;
+ u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
#ifdef ASSERT_PDIR_SANITY
- /* Assert first pdir entry is set */
- if (0x80 != (((u8 *) ioc->pdir_base)[off])) {
+ /* Assert first pdir entry is set.
+ **
+ ** Even though this is a big-endian machine, the entries
+ ** in the iopdir are little endian. That's why we look at
+ ** the byte at +7 instead of at +0.
+ */
+ if (0x80 != (((u8 *) pdir_ptr)[7])) {
sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
}
#endif
- if (byte_cnt <= IOVP_SIZE)
+ if (byte_cnt > IOVP_SIZE)
{
- iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
+#if 0
+ unsigned long entries_per_cacheline = ioc_needs_fdc ?
+ L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
+ - (unsigned long) pdir_ptr;
+ : 262144;
+#endif
- /*
- ** clear I/O PDIR entry "valid" bit
- ** Do NOT clear the rest - save it for debugging.
- ** We should only clear bits that have previously
- ** been enabled.
- */
- ((u8 *)(ioc->pdir_base))[off] = 0;
- } else {
- u32 t = get_order(byte_cnt) + PAGE_SHIFT;
+ /* set "size" field for PCOM */
+ iovp |= get_order(byte_cnt) + PAGE_SHIFT;
- iovp |= t;
do {
/* clear I/O Pdir entry "valid" bit first */
- ((u8 *)(ioc->pdir_base))[off] = 0;
- off += sizeof(u64);
+ ((u8 *) pdir_ptr)[7] = 0;
+ if (ioc_needs_fdc) {
+ asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
+#if 0
+ entries_per_cacheline = L1_CACHE_SHIFT - 3;
+#endif
+ }
+ pdir_ptr++;
byte_cnt -= IOVP_SIZE;
- } while (byte_cnt > 0);
- }
+ } while (byte_cnt > IOVP_SIZE);
+ } else
+ iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
+
+ /*
+ ** clear I/O PDIR entry "valid" bit.
+ ** We have to R/M/W the cacheline regardless how much of the
+ ** pdir entry that we clobber.
+ ** The rest of the entry would be useful for debugging if we
+ ** could dump core on HPMC.
+ */
+ ((u8 *) pdir_ptr)[7] = 0;
+ if (ioc_needs_fdc)
+ asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
}
@@ -819,18 +833,29 @@ sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
static int sba_dma_supported( struct device *dev, u64 mask)
{
struct ioc *ioc;
+
if (dev == NULL) {
printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
BUG();
return(0);
}
- ioc = GET_IOC(dev);
+ /* Documentation/DMA-mapping.txt tells drivers to try 64-bit first,
+ * then fall back to 32-bit if that fails.
+ * We are just "encouraging" 32-bit DMA masks here since we can
+ * never allow IOMMU bypass unless we add special support for ZX1.
+ */
+ if (mask > ~0U)
+ return 0;
- /* check if mask is > than the largest IO Virt Address */
+ ioc = GET_IOC(dev);
- return((int) (mask >= (ioc->ibase +
- (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
+ /*
+ * check if mask is >= than the current max IO Virt Address
+ * The max IO Virt address will *always* < 30 bits.
+ */
+ return((int)(mask >= (ioc->ibase - 1 +
+ (ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
}
@@ -898,11 +923,17 @@ sba_map_single(struct device *dev, void *addr, size_t size,
size -= IOVP_SIZE;
pdir_start++;
}
- /* form complete address */
+
+ /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
+ if (ioc_needs_fdc)
+ asm volatile("sync" : : );
+
#ifdef ASSERT_PDIR_SANITY
sba_check_pdir(ioc,"Check after sba_map_single()");
#endif
spin_unlock_irqrestore(&ioc->res_lock, flags);
+
+ /* form complete address */
return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
}
@@ -958,12 +989,19 @@ sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size,
d--;
}
ioc->saved_cnt = 0;
+
READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
}
#else /* DELAYED_RESOURCE_CNT == 0 */
sba_free_range(ioc, iova, size);
+
+ /* If fdc's were issued, force fdc's to be visible now */
+ if (ioc_needs_fdc)
+ asm volatile("sync" : : );
+
READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
#endif /* DELAYED_RESOURCE_CNT == 0 */
+
spin_unlock_irqrestore(&ioc->res_lock, flags);
/* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
@@ -1106,6 +1144,10 @@ sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
*/
filled = iommu_fill_pdir(ioc, sglist, nents, 0, sba_io_pdir_entry);
+ /* force FDC ops in io_pdir_entry() to be visible to IOMMU */
+ if (ioc_needs_fdc)
+ asm volatile("sync" : : );
+
#ifdef ASSERT_PDIR_SANITY
if (sba_check_pdir(ioc,"Check after sba_map_sg()"))
{
@@ -1234,8 +1276,10 @@ sba_alloc_pdir(unsigned int pdir_size)
unsigned long pdir_order = get_order(pdir_size);
pdir_base = __get_free_pages(GFP_KERNEL, pdir_order);
- if (NULL == (void *) pdir_base)
- panic("sba_ioc_init() could not allocate I/O Page Table\n");
+ if (NULL == (void *) pdir_base) {
+ panic("%s() could not allocate I/O Page Table\n",
+ __FUNCTION__);
+ }
/* If this is not PA8700 (PCX-W2)
** OR newer than ver 2.2
@@ -1353,7 +1397,7 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
u32 iova_space_mask;
u32 iova_space_size;
int iov_order, tcnfg;
-#if SBA_AGP_SUPPORT
+#ifdef SBA_AGP_SUPPORT
int agp_found = 0;
#endif
/*
@@ -1390,7 +1434,7 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
DBG_INIT("%s() pdir %p size %x\n",
__FUNCTION__, ioc->pdir_base, ioc->pdir_size);
-#if SBA_HINT_SUPPORT
+#ifdef SBA_HINT_SUPPORT
ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));
@@ -1414,7 +1458,7 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
WRITE_REG(ioc->imask, ioc->ioc_hpa + IOC_IMASK);
-#ifdef __LP64__
+#ifdef CONFIG_64BIT
/*
** Setting the upper bits makes checking for bypass addresses
** a little faster later on.
@@ -1447,7 +1491,7 @@ sba_ioc_init_pluto(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
*/
WRITE_REG(ioc->ibase | 31, ioc->ioc_hpa + IOC_PCOM);
-#if SBA_AGP_SUPPORT
+#ifdef SBA_AGP_SUPPORT
/*
** If an AGP device is present, only use half of the IOV space
** for PCI DMA. Unfortunately we can't know ahead of time
@@ -1499,11 +1543,9 @@ sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
iova_space_size = 1 << (20 - PAGE_SHIFT);
}
-#ifdef __LP64__
else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
iova_space_size = 1 << (30 - PAGE_SHIFT);
}
-#endif
/*
** iova space must be log2() in size.
@@ -1529,7 +1571,7 @@ sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
DBG_INIT("%s() pdir %p size %x\n",
__FUNCTION__, ioc->pdir_base, pdir_size);
-#if SBA_HINT_SUPPORT
+#ifdef SBA_HINT_SUPPORT
/* FIXME : DMA HINTs not used */
ioc->hint_shift_pdir = iov_order + PAGE_SHIFT;
ioc->hint_mask_pdir = ~(0x3 << (iov_order + PAGE_SHIFT));