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authorNadav Amit <namit@vmware.com>2016-06-24 06:13:14 -0700
committerJoerg Roedel <jroedel@suse.de>2016-07-13 12:06:35 +0200
commit452014d2b4824ed9ca32a3ef6ee745f22431132a (patch)
tree670df5cba4cd8613b671fbb7581fe6edb2b89a9b /drivers/iommu
parentffb2d1eb88c3262f7a7001c5afeec6babe144b73 (diff)
downloadlinux-452014d2b4824ed9ca32a3ef6ee745f22431132a.tar.bz2
iommu/vt-d: Remove unnecassary qi clflushes
According to the manual: "Hardware access to ... invalidation queue ... are always coherent." Remove unnecassary clflushes accordingly. Signed-off-by: Nadav Amit <namit@vmware.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/dmar.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 2eff7b6c6c98..1344e29acd86 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1167,8 +1167,6 @@ static int qi_check_fault(struct intel_iommu *iommu, int index)
(unsigned long long)qi->desc[index].high);
memcpy(&qi->desc[index], &qi->desc[wait_index],
sizeof(struct qi_desc));
- __iommu_flush_cache(iommu, &qi->desc[index],
- sizeof(struct qi_desc));
writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG);
return -EINVAL;
}
@@ -1243,9 +1241,6 @@ restart:
hw[wait_index] = wait_desc;
- __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc));
- __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc));
-
qi->free_head = (qi->free_head + 2) % QI_LENGTH;
qi->free_cnt -= 2;