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intel-iommu: Avoid global flushes with caching mode.

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While it may be efficient on real hardware, emulation of global
invalidations is very expensive as all shadow entries must be examined.
This patch changes the behaviour when caching mode is enabled (which is
the case when IOMMU emulation takes place). In this case, page specific
invalidation is used instead.

Signed-off-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Nadav Amit 2010-04-08 23:00:41 +03:00 committed by David Woodhouse
parent 82653633b6
commit 78d5f0f500
1 changed files with 13 additions and 4 deletions
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9
drivers/pci/intel-iommu.c
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@ -2647,15 +2647,24 @@ static void flush_unmaps(void)
if (!deferred_flush[i].next)
continue;
/* In caching mode, global flushes turn emulation expensive */
if (!cap_caching_mode(iommu->cap))
iommu->flush.flush_iotlb(iommu, 0, 0, 0,
DMA_TLB_GLOBAL_FLUSH);
for (j = 0; j < deferred_flush[i].next; j++) {
unsigned long mask;
struct iova *iova = deferred_flush[i].iova[j];
struct dmar_domain *domain = deferred_flush[i].domain[j];
/* On real hardware multiple invalidations are expensive */
if (cap_caching_mode(iommu->cap))
iommu_flush_iotlb_psi(iommu, domain->id,
iova->pfn_lo, iova->pfn_hi - iova->pfn_lo + 1, 0);
else {
mask = ilog2(mm_to_dma_pfn(iova->pfn_hi - iova->pfn_lo + 1));
iommu_flush_dev_iotlb(deferred_flush[i].domain[j],
(uint64_t)iova->pfn_lo << PAGE_SHIFT, mask);
}
__free_iova(&deferred_flush[i].domain[j]->iovad, iova);
}
deferred_flush[i].next = 0;