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authorJoerg Roedel <jroedel@suse.de>2015-04-01 15:58:52 +0300
committerJoerg Roedel <jroedel@suse.de>2015-04-02 14:31:08 +0300
commitd4b036648402bb4ef6d4a0df51375a2fb705b6cc (patch)
tree9f464e5834439731cb8260f0883a65838a217c01 /drivers/iommu
parentb24b1b63a37d05d61601d643ef30f95dd2452048 (diff)
downloadlinux-d4b036648402bb4ef6d4a0df51375a2fb705b6cc.tar.xz
iommu/amd: Correctly encode huge pages in iommu page tables
When a default page-size for given level should be mapped, the level encoding must be 0 rather than 7. This fixes an issue seen on IOMMUv2 hardware, where this encoding is enforced. Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 7a00e5d40eb6..aa710b095f1a 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1390,13 +1390,14 @@ static int iommu_map_page(struct protection_domain *dom,
u64 __pte, *pte;
int i, count;
+ BUG_ON(!IS_ALIGNED(bus_addr, page_size));
+ BUG_ON(!IS_ALIGNED(phys_addr, page_size));
+
if (!(prot & IOMMU_PROT_MASK))
return -EINVAL;
- bus_addr = PAGE_ALIGN(bus_addr);
- phys_addr = PAGE_ALIGN(phys_addr);
- count = PAGE_SIZE_PTE_COUNT(page_size);
- pte = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL);
+ count = PAGE_SIZE_PTE_COUNT(page_size);
+ pte = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL);
if (!pte)
return -ENOMEM;
@@ -1405,7 +1406,7 @@ static int iommu_map_page(struct protection_domain *dom,
if (IOMMU_PTE_PRESENT(pte[i]))
return -EBUSY;
- if (page_size > PAGE_SIZE) {
+ if (count > 1) {
__pte = PAGE_SIZE_PTE(phys_addr, page_size);
__pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_P | IOMMU_PTE_FC;
} else