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authorDavid Woodhouse <dwmw2@infradead.org>2014-06-09 14:09:53 +0100
committerShow Liu <show.liu@linaro.org>2014-06-18 12:05:33 +0800
commit8cd03dd8d023a9fb24123c3ac10ad66b60ba9254 (patch)
treef8d1a045b9c47772dfe7103579d71bb30e59ee42
parentc9be1de409cb5833993084595292b15fbbceb178 (diff)
downloadlinaro-lsk-8cd03dd8d023a9fb24123c3ac10ad66b60ba9254.tar.gz
iommu/vt-d: Fix missing IOTLB flush in intel_iommu_unmap()
Based on commit ea8ea460c9ace60bbb5ac6e5521d637d5c15293d upstream This missing IOTLB flush was added as a minor, inconsequential bug-fix in commit ea8ea460c ("iommu/vt-d: Clean up and fix page table clear/free behaviour") in 3.15. It wasn't originally intended for -stable but a couple of users have reported issues which turn out to be fixed by adding the missing flush. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/iommu/intel-iommu.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a22c86c867f..40f6b47c28f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4075,7 +4075,7 @@ static size_t intel_iommu_unmap(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
struct dmar_domain *dmar_domain = domain->priv;
- int order;
+ int order, iommu_id;
order = dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT,
(iova + size - 1) >> VTD_PAGE_SHIFT);
@@ -4083,6 +4083,22 @@ static size_t intel_iommu_unmap(struct iommu_domain *domain,
if (dmar_domain->max_addr == iova + size)
dmar_domain->max_addr = iova;
+ for_each_set_bit(iommu_id, dmar_domain->iommu_bmp, g_num_of_iommus) {
+ struct intel_iommu *iommu = g_iommus[iommu_id];
+ int num, ndomains;
+
+ /*
+ * find bit position of dmar_domain
+ */
+ ndomains = cap_ndoms(iommu->cap);
+ for_each_set_bit(num, iommu->domain_ids, ndomains) {
+ if (iommu->domains[num] == dmar_domain)
+ iommu_flush_iotlb_psi(iommu, num,
+ iova >> VTD_PAGE_SHIFT,
+ 1 << order, 0);
+ }
+ }
+
return PAGE_SIZE << order;
}