From 452014d2b4824ed9ca32a3ef6ee745f22431132a Mon Sep 17 00:00:00 2001 From: Nadav Amit <namit@vmware.com> Date: Fri, 24 Jun 2016 06:13:14 -0700 Subject: [PATCH] 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> --- drivers/iommu/dmar.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 2eff7b6c6c98f..1344e29acd861 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; -- 2.30.2