[PATCH AUTOSEL 5.6 116/129] iommu/vt-d: Fix page request descriptor size

Sasha Levin
2020-04-15T12:55:26Z

From: Jacob Pan <jacob.jun.pan@linux.intel.com>

[ Upstream commit 52355fb1919ef7ed9a38e0f3de6e928de1f57217 ]

Intel VT-d might support PRS (Page Reqest Support) when it's
running in the scalable mode. Each page request descriptor
occupies 32 bytes and is 32-bytes aligned. The page request
descriptor offset mask should be 32-bytes aligned.

Fixes: 5b438f4ba315d ("iommu/vt-d: Support page request in scalable mode")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/intel-svm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index fc7d78876e021..2998418f0a383 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -531,7 +531,7 @@ struct page_req_dsc {
u64 priv_data[2];
};

-#define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x10)
+#define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x20)

static bool access_error(struct vm_area_struct *vma, struct page_req_dsc *req)
{
--
2.20.1