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iommu/vt-d: Remove unnecassary qi clflushes

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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>
This commit is contained in:
Nadav Amit 2016-06-24 06:13:14 -07:00 committed by Joerg Roedel
parent ffb2d1eb88
commit 452014d2b4
1 changed files with 0 additions and 5 deletions
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5
drivers/iommu/dmar.c
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@ -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;