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authorYanfei Xu <yanfei.xu@intel.com>2023-08-09 20:48:05 +0800
committerJoerg Roedel <jroedel@suse.de>2023-08-09 17:46:19 +0200
commitfb5f50a43d9fd44fd6bc4f4dbcf9d3ec5b556558 (patch)
treedea317c16a9306b582642e60cc018a1f8228834d /drivers/iommu
parent8a3b8e63f8371c1247b7aa24ff9c5312f1a6948b (diff)
iommu/vt-d: Fix to convert mm pfn to dma pfn
For the case that VT-d page is smaller than mm page, converting dma pfn should be handled in two cases which are for start pfn and for end pfn. Currently the calculation of end dma pfn is incorrect and the result is less than real page frame number which is causing the mapping of iova always misses some page frames. Rename the mm_to_dma_pfn() to mm_to_dma_pfn_start() and add a new helper for converting end dma pfn named mm_to_dma_pfn_end(). Signed-off-by: Yanfei Xu <yanfei.xu@intel.com> Link: https://lore.kernel.org/r/20230625082046.979742-1-yanfei.xu@intel.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel/iommu.c22
1 files changed, 13 insertions, 9 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 9369a8b02bd6..dbf9270e565e 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -113,13 +113,17 @@ static inline unsigned long lvl_to_nr_pages(unsigned int lvl)
/* VT-d pages must always be _smaller_ than MM pages. Otherwise things
are never going to work. */
-static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn)
+static inline unsigned long mm_to_dma_pfn_start(unsigned long mm_pfn)
{
return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT);
}
+static inline unsigned long mm_to_dma_pfn_end(unsigned long mm_pfn)
+{
+ return ((mm_pfn + 1) << (PAGE_SHIFT - VTD_PAGE_SHIFT)) - 1;
+}
static inline unsigned long page_to_dma_pfn(struct page *pg)
{
- return mm_to_dma_pfn(page_to_pfn(pg));
+ return mm_to_dma_pfn_start(page_to_pfn(pg));
}
static inline unsigned long virt_to_dma_pfn(void *p)
{
@@ -2403,8 +2407,8 @@ static int __init si_domain_init(int hw)
for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
ret = iommu_domain_identity_map(si_domain,
- mm_to_dma_pfn(start_pfn),
- mm_to_dma_pfn(end_pfn));
+ mm_to_dma_pfn_start(start_pfn),
+ mm_to_dma_pfn_end(end_pfn));
if (ret)
return ret;
}
@@ -2425,8 +2429,8 @@ static int __init si_domain_init(int hw)
continue;
ret = iommu_domain_identity_map(si_domain,
- mm_to_dma_pfn(start >> PAGE_SHIFT),
- mm_to_dma_pfn(end >> PAGE_SHIFT));
+ mm_to_dma_pfn_start(start >> PAGE_SHIFT),
+ mm_to_dma_pfn_end(end >> PAGE_SHIFT));
if (ret)
return ret;
}
@@ -3549,8 +3553,8 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb,
unsigned long val, void *v)
{
struct memory_notify *mhp = v;
- unsigned long start_vpfn = mm_to_dma_pfn(mhp->start_pfn);
- unsigned long last_vpfn = mm_to_dma_pfn(mhp->start_pfn +
+ unsigned long start_vpfn = mm_to_dma_pfn_start(mhp->start_pfn);
+ unsigned long last_vpfn = mm_to_dma_pfn_end(mhp->start_pfn +
mhp->nr_pages - 1);
switch (val) {
@@ -4254,7 +4258,7 @@ static void intel_iommu_tlb_sync(struct iommu_domain *domain,
unsigned long i;
nrpages = aligned_nrpages(gather->start, size);
- start_pfn = mm_to_dma_pfn(iova_pfn);
+ start_pfn = mm_to_dma_pfn_start(iova_pfn);
xa_for_each(&dmar_domain->iommu_array, i, info)
iommu_flush_iotlb_psi(info->iommu, dmar_domain,