linux-kernel - [PATCH] iommu/vt-d: Fix to flush cache of PASID directory table

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Message-Id: <20230615071613.690639-1-yanfei.xu@intel.com>
Date:   Thu, 15 Jun 2023 15:16:13 +0800
From:   Yanfei Xu <yanfei.xu@...el.com>
To:     dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
        will@...nel.org, robin.murphy@....com
Cc:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        yanfei.xu@...el.com
Subject: [PATCH] iommu/vt-d: Fix to flush cache of PASID directory table

Even the PCI devices don't support pasid capability, PASID
table is mandatory for a PCI device in scalable mode. However
flushing cache of pasid directory table for these devices are
not taken after pasid table is allocated as the "size" of
table is zero. Fix to assign it with a page size.

Fixes: 194b3348bdbb ("iommu/vt-d: Fix PASID directory pointer coherency")
Signed-off-by: Yanfei Xu <yanfei.xu@...el.com>
---
 drivers/iommu/intel/pasid.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index c5d479770e12..bde7df055865 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -115,7 +115,9 @@ int intel_pasid_alloc_table(struct device *dev)
 				  intel_pasid_max_id);
 
 	size = max_pasid >> (PASID_PDE_SHIFT - 3);
-	order = size ? get_order(size) : 0;
+	if (!size)
+		size = PAGE_SIZE;
+	order = get_order(size);
 	pages = alloc_pages_node(info->iommu->node,
 				 GFP_KERNEL | __GFP_ZERO, order);
 	if (!pages) {
-- 
2.34.1