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iommu/vt-d: Implement deferred invalidate for SVM 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
hifive-unleashed-5.1
David Woodhouse 2015-10-13 14:11:13 +01:00
parent 2f26e0a9c9
commit 907fea3491
3 changed files with 12 additions and 0 deletions
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2
drivers/iommu/intel-iommu.c
View File

@ -4981,6 +4981,8 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sd
ctx_lo |= CONTEXT_TT_PT_PASID << 2;
}
ctx_lo |= CONTEXT_PASIDE;
if (iommu->pasid_state_table)
ctx_lo |= CONTEXT_DINVE;
context[0].lo = ctx_lo;
wmb();
iommu->flush.flush_context(iommu, sdev->did, sdev->sid,

9
drivers/iommu/intel-svm.c
View File

@ -26,6 +26,10 @@ struct pasid_entry {
u64 val;
};
struct pasid_state_entry {
u64 val;
};
int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu)
{
struct page *pages;
@ -127,6 +131,11 @@ static void intel_flush_svm_range(struct intel_svm *svm, unsigned long address,
{
struct intel_svm_dev *sdev;
/* Try deferred invalidate if available */
if (svm->iommu->pasid_state_table &&
!cmpxchg64(&svm->iommu->pasid_state_table[svm->pasid].val, 0, 1ULL << 63))
return;
rcu_read_lock();
list_for_each_entry_rcu(sdev, &svm->devs, list)
intel_flush_svm_range_dev(svm, sdev, address, pages, ih);

1
include/linux/dma_remapping.h
View File

@ -25,6 +25,7 @@
#define CONTEXT_TT_PT_PASID_DEV_IOTLB 5
#define CONTEXT_TT_MASK (7ULL << 2)
#define CONTEXT_DINVE (1ULL << 8)
#define CONTEXT_PRS (1ULL << 9)
#define CONTEXT_PASIDE (1ULL << 11)