This patch is another sequel to my patchset that fixes iommu segment boundary problems, that is, IOMMUs allocate memory areas without considering a low level driver's segment boundary limits: http://www.mail-archive.com/linux-scsi@xxxxxxxxxxxxxxx/msg11919.html This patchset fixes the IA64 IOMMU code. This assumes that ioc->ibase is on iovp_size boundary. If not, please let me know. I'll fix the patch. = From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> Subject: [PATCH -mm] ia64: make IOMMU respect the segment boundary limits This makes IA64's IOMMU implementation not allocate a memory area spanning LLD's segment boundary. Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> Cc: Tony Luck <tony.luck@xxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/ia64/Kconfig | 3 ++ arch/ia64/hp/common/sba_iommu.c | 56 +++++++++++++++++++++++++++------------ 2 files changed, 42 insertions(+), 17 deletions(-) diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 8fa3faf..1b73ffe 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -611,6 +611,9 @@ config IRQ_PER_CPU bool default y +config IOMMU_HELPER + def_bool (IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB || IA64_GENERIC) + source "arch/ia64/hp/sim/Kconfig" source "arch/ia64/Kconfig.debug" diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c index 523eae6..9409de5 100644 --- a/arch/ia64/hp/common/sba_iommu.c +++ b/arch/ia64/hp/common/sba_iommu.c @@ -35,6 +35,7 @@ #include <linux/nodemask.h> #include <linux/bitops.h> /* hweight64() */ #include <linux/crash_dump.h> +#include <linux/iommu-helper.h> #include <asm/delay.h> /* ia64_get_itc() */ #include <asm/io.h> @@ -460,6 +461,13 @@ get_iovp_order (unsigned long size) return order; } +static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr, + unsigned int bitshiftcnt) +{ + return (((unsigned long)res_ptr - (unsigned long)ioc->res_map) << 3) + + bitshiftcnt; +} + /** * sba_search_bitmap - find free space in IO PDIR resource bitmap * @ioc: IO MMU structure which owns the pdir we are interested in. @@ -471,15 +479,25 @@ get_iovp_order (unsigned long size) * Cool perf optimization: search for log2(size) bits at a time. */ static SBA_INLINE unsigned long -sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted, int use_hint) +sba_search_bitmap(struct ioc *ioc, struct device *dev, + unsigned long bits_wanted, int use_hint) { unsigned long *res_ptr; unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]); - unsigned long flags, pide = ~0UL; + unsigned long flags, pide = ~0UL, tpide; + unsigned long boundary_size; + unsigned long shift; + int ret; ASSERT(((unsigned long) ioc->res_hint & (sizeof(unsigned long) - 1UL)) == 0); ASSERT(res_ptr < res_end); + boundary_size = (unsigned long long)dma_get_seg_boundary(dev) + 1; + boundary_size = ALIGN(boundary_size, 1ULL << iovp_shift) >> iovp_shift; + + BUG_ON(ioc->ibase & ~iovp_mask); + shift = ioc->ibase >> iovp_shift; + spin_lock_irqsave(&ioc->res_lock, flags); /* Allow caller to force a search through the entire resource space */ @@ -504,9 +522,7 @@ sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted, int use_hint) if (likely(*res_ptr != ~0UL)) { bitshiftcnt = ffz(*res_ptr); *res_ptr |= (1UL << bitshiftcnt); - pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map); - pide <<= 3; /* convert to bit address */ - pide += bitshiftcnt; + pide = ptr_to_pide(ioc, res_ptr, bitshiftcnt); ioc->res_bitshift = bitshiftcnt + bits_wanted; goto found_it; } @@ -535,11 +551,13 @@ sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted, int use_hint) DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr); ASSERT(0 != mask); for (; mask ; mask <<= o, bitshiftcnt += o) { - if(0 == ((*res_ptr) & mask)) { + tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt); + ret = iommu_is_span_boundary(tpide, bits_wanted, + shift, + boundary_size); + if ((0 == ((*res_ptr) & mask)) && !ret) { *res_ptr |= mask; /* mark resources busy! */ - pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map); - pide <<= 3; /* convert to bit address */ - pide += bitshiftcnt; + pide = tpide; ioc->res_bitshift = bitshiftcnt + bits_wanted; goto found_it; } @@ -560,6 +578,11 @@ sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted, int use_hint) end = res_end - qwords; for (; res_ptr < end; res_ptr++) { + tpide = ptr_to_pide(ioc, res_ptr, 0); + ret = iommu_is_span_boundary(tpide, bits_wanted, + shift, boundary_size); + if (ret) + goto next_ptr; for (i = 0 ; i < qwords ; i++) { if (res_ptr[i] != 0) goto next_ptr; @@ -572,8 +595,7 @@ sba_search_bitmap(struct ioc *ioc, unsigned long bits_wanted, int use_hint) res_ptr[i] = ~0UL; res_ptr[i] |= RESMAP_MASK(bits); - pide = ((unsigned long)res_ptr - (unsigned long)ioc->res_map); - pide <<= 3; /* convert to bit address */ + pide = tpide; res_ptr += qwords; ioc->res_bitshift = bits; goto found_it; @@ -605,7 +627,7 @@ found_it: * resource bit map. */ static int -sba_alloc_range(struct ioc *ioc, size_t size) +sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size) { unsigned int pages_needed = size >> iovp_shift; #ifdef PDIR_SEARCH_TIMING @@ -622,9 +644,9 @@ sba_alloc_range(struct ioc *ioc, size_t size) /* ** "seek and ye shall find"...praying never hurts either... */ - pide = sba_search_bitmap(ioc, pages_needed, 1); + pide = sba_search_bitmap(ioc, dev, pages_needed, 1); if (unlikely(pide >= (ioc->res_size << 3))) { - pide = sba_search_bitmap(ioc, pages_needed, 0); + pide = sba_search_bitmap(ioc, dev, pages_needed, 0); if (unlikely(pide >= (ioc->res_size << 3))) { #if DELAYED_RESOURCE_CNT > 0 unsigned long flags; @@ -653,7 +675,7 @@ sba_alloc_range(struct ioc *ioc, size_t size) } spin_unlock_irqrestore(&ioc->saved_lock, flags); - pide = sba_search_bitmap(ioc, pages_needed, 0); + pide = sba_search_bitmap(ioc, dev, pages_needed, 0); if (unlikely(pide >= (ioc->res_size << 3))) panic(__FILE__ ": I/O MMU @ %p is out of mapping resources\n", ioc->ioc_hpa); @@ -936,7 +958,7 @@ sba_map_single(struct device *dev, void *addr, size_t size, int dir) spin_unlock_irqrestore(&ioc->res_lock, flags); #endif - pide = sba_alloc_range(ioc, size); + pide = sba_alloc_range(ioc, dev, size); iovp = (dma_addr_t) pide << iovp_shift; @@ -1373,7 +1395,7 @@ sba_coalesce_chunks(struct ioc *ioc, struct device *dev, dma_len = (dma_len + dma_offset + ~iovp_mask) & iovp_mask; ASSERT(dma_len <= DMA_CHUNK_SIZE); dma_sg->dma_address = (dma_addr_t) (PIDE_FLAG - | (sba_alloc_range(ioc, dma_len) << iovp_shift) + | (sba_alloc_range(ioc, dev, dma_len) << iovp_shift) | dma_offset); n_mappings++; } -- 1.5.3.7 -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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