intel-iommu sg chaining support
x86_64 defines ARCH_HAS_SG_CHAIN. So if IOMMU implementations don't
support sg chaining, we will get data corruption.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 8f372c8..b3d7031 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1963,7 +1963,7 @@
}
#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset)
-static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sg,
+static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
int nelems, int dir)
{
int i;
@@ -1973,16 +1973,17 @@
struct iova *iova;
size_t size = 0;
void *addr;
+ struct scatterlist *sg;
if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
return;
domain = find_domain(pdev);
- iova = find_iova(&domain->iovad, IOVA_PFN(sg[0].dma_address));
+ iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));
if (!iova)
return;
- for (i = 0; i < nelems; i++, sg++) {
+ for_each_sg(sglist, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
size += aligned_size((u64)addr, sg->length);
}
@@ -2003,21 +2004,21 @@
}
static int intel_nontranslate_map_sg(struct device *hddev,
- struct scatterlist *sg, int nelems, int dir)
+ struct scatterlist *sglist, int nelems, int dir)
{
int i;
+ struct scatterlist *sg;
- for (i = 0; i < nelems; i++) {
- struct scatterlist *s = &sg[i];
- BUG_ON(!s->page);
- s->dma_address = virt_to_bus(SG_ENT_VIRT_ADDRESS(s));
- s->dma_length = s->length;
+ for_each_sg(sglist, sg, nelems, i) {
+ BUG_ON(!sg->page);
+ sg->dma_address = virt_to_bus(SG_ENT_VIRT_ADDRESS(sg));
+ sg->dma_length = sg->length;
}
return nelems;
}
-static int intel_map_sg(struct device *hwdev, struct scatterlist *sg,
- int nelems, int dir)
+static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist,
+ int nelems, int dir)
{
void *addr;
int i;
@@ -2028,18 +2029,18 @@
size_t offset = 0;
struct iova *iova = NULL;
int ret;
- struct scatterlist *orig_sg = sg;
+ struct scatterlist *sg;
unsigned long start_addr;
BUG_ON(dir == DMA_NONE);
if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
- return intel_nontranslate_map_sg(hwdev, sg, nelems, dir);
+ return intel_nontranslate_map_sg(hwdev, sglist, nelems, dir);
domain = get_valid_domain_for_dev(pdev);
if (!domain)
return 0;
- for (i = 0; i < nelems; i++, sg++) {
+ for_each_sg(sglist, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
addr = (void *)virt_to_phys(addr);
size += aligned_size((u64)addr, sg->length);
@@ -2047,7 +2048,7 @@
iova = __intel_alloc_iova(hwdev, domain, size);
if (!iova) {
- orig_sg->dma_length = 0;
+ sglist->dma_length = 0;
return 0;
}
@@ -2063,8 +2064,7 @@
start_addr = iova->pfn_lo << PAGE_SHIFT_4K;
offset = 0;
- sg = orig_sg;
- for (i = 0; i < nelems; i++, sg++) {
+ for_each_sg(sglist, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
addr = (void *)virt_to_phys(addr);
size = aligned_size((u64)addr, sg->length);