linux-kernel - [PATCH 1/1] iommu/vt-d: Fix page request descriptor size

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Date:   Tue, 17 Mar 2020 09:10:18 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     ashok.raj@...el.com, jacob.jun.pan@...ux.intel.com,
        kevin.tian@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Liu Yi L <yi.l.liu@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 1/1] iommu/vt-d: Fix page request descriptor size

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

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: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 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 0e506de2d375..6183016f4269 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -491,7 +491,7 @@ 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)
 {
-- 
2.17.1