From: Lu Baolu baolu.lu@linux.intel.com
[ Upstream commit a8ce9ebbecdfda3322bbcece6b3b25888217f8e3 ]
The Access/Dirty bits in the first level page table entry will be set whenever a page table entry was used for address translation or write permission was successfully translated. This is always true when using the first-level page table for kernel IOVA. Instead of wasting hardware cycles to update the certain bits, it's better to set them up at the beginning.
Suggested-by: Ashok Raj ashok.raj@intel.com Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Link: https://lore.kernel.org/r/20210115004202.953965-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel/iommu.c | 14 ++++++++++++-- include/linux/intel-iommu.h | 2 ++ 2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 026041308409..2f5d12cdb298 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -1023,8 +1023,11 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE); pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE; - if (domain_use_first_level(domain)) + if (domain_use_first_level(domain)) { pteval |= DMA_FL_PTE_XD | DMA_FL_PTE_US; + if (domain->domain.type == IOMMU_DOMAIN_DMA) + pteval |= DMA_FL_PTE_ACCESS; + } if (cmpxchg64(&pte->val, 0ULL, pteval)) /* Someone else set it while we were thinking; use theirs. */ free_pgtable_page(tmp_page); @@ -2351,9 +2354,16 @@ __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, return -EINVAL;
attr = prot & (DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP); - if (domain_use_first_level(domain)) + if (domain_use_first_level(domain)) { attr |= DMA_FL_PTE_PRESENT | DMA_FL_PTE_XD | DMA_FL_PTE_US;
+ if (domain->domain.type == IOMMU_DOMAIN_DMA) { + attr |= DMA_FL_PTE_ACCESS; + if (prot & DMA_PTE_WRITE) + attr |= DMA_FL_PTE_DIRTY; + } + } + pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | attr;
while (nr_pages > 0) { diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 09c6a0bf3892..ecb35fdff03e 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -42,6 +42,8 @@
#define DMA_FL_PTE_PRESENT BIT_ULL(0) #define DMA_FL_PTE_US BIT_ULL(2) +#define DMA_FL_PTE_ACCESS BIT_ULL(5) +#define DMA_FL_PTE_DIRTY BIT_ULL(6) #define DMA_FL_PTE_XD BIT_ULL(63)
#define ADDR_WIDTH_5LEVEL (57)