diff options
| author | Lu Baolu <baolu.lu@linux.intel.com> | 2021-08-18 21:48:48 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-08-19 10:41:08 +0200 |
| commit | 289b3b005cb9d9dd6b30297b52c2b4596bc878b2 (patch) | |
| tree | fbbfa6ceb84862eeeb8be20af160039658b14b24 /drivers/iommu | |
| parent | 792fb43ce2c98878f1539c1d3fdecc1d7a7d78fd (diff) | |
iommu/vt-d: Preset A/D bits for user space DMA usage
We preset the access and dirty bits for IOVA over first level usage only
for the kernel DMA (i.e., when domain type is IOMMU_DOMAIN_DMA). We should
also preset the FL A/D for user space DMA usage. The idea is that even the
user space A/D bit memory write is unnecessary. We should avoid it to
minimize the overhead.
Suggested-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210720013856.4143880-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210818134852.1847070-6-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.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 8c9a9ed7dc09..8d4d49e12c51 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2334,13 +2334,9 @@ __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, attr = prot & (DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP); attr |= DMA_FL_PTE_PRESENT; if (domain_use_first_level(domain)) { - attr |= DMA_FL_PTE_XD | DMA_FL_PTE_US; - - if (iommu_is_dma_domain(&domain->domain)) { - attr |= DMA_FL_PTE_ACCESS; - if (prot & DMA_PTE_WRITE) - attr |= DMA_FL_PTE_DIRTY; - } + attr |= DMA_FL_PTE_XD | DMA_FL_PTE_US | DMA_FL_PTE_ACCESS; + if (prot & DMA_PTE_WRITE) + attr |= DMA_FL_PTE_DIRTY; } pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | attr; |