diff options
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a004c3945c6..c181883c2f9 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -78,6 +78,24 @@ #define LEVEL_STRIDE (9) #define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1) +/* + * This bitmap is used to advertise the page sizes our hardware support + * to the IOMMU core, which will then use this information to split + * physically contiguous memory regions it is mapping into page sizes + * that we support. + * + * Traditionally the IOMMU core just handed us the mappings directly, + * after making sure the size is an order of a 4KiB page and that the + * mapping has natural alignment. + * + * To retain this behavior, we currently advertise that we support + * all page sizes that are an order of 4KiB. + * + * If at some point we'd like to utilize the IOMMU core's new behavior, + * we could change this to advertise the real page sizes we support. + */ +#define INTEL_IOMMU_PGSIZES (~0xFFFUL) + static inline int agaw_to_level(int agaw) { return agaw + 2; @@ -3979,12 +3997,11 @@ static void intel_iommu_detach_device(struct iommu_domain *domain, static int intel_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t hpa, - int gfp_order, int iommu_prot) + size_t size, int iommu_prot) { struct dmar_domain *dmar_domain = domain->priv; u64 max_addr; int prot = 0; - size_t size; int ret; if (iommu_prot & IOMMU_READ) @@ -3994,7 +4011,6 @@ static int intel_iommu_map(struct iommu_domain *domain, if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping) prot |= DMA_PTE_SNP; - size = PAGE_SIZE << gfp_order; max_addr = iova + size; if (dmar_domain->max_addr < max_addr) { u64 end; @@ -4017,11 +4033,10 @@ static int intel_iommu_map(struct iommu_domain *domain, return ret; } -static int intel_iommu_unmap(struct iommu_domain *domain, - unsigned long iova, int gfp_order) +static size_t intel_iommu_unmap(struct iommu_domain *domain, + unsigned long iova, size_t size) { struct dmar_domain *dmar_domain = domain->priv; - size_t size = PAGE_SIZE << gfp_order; int order; order = dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT, @@ -4030,7 +4045,7 @@ static int intel_iommu_unmap(struct iommu_domain *domain, if (dmar_domain->max_addr == iova + size) dmar_domain->max_addr = iova; - return order; + return PAGE_SIZE << order; } static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain, @@ -4069,6 +4084,7 @@ static struct iommu_ops intel_iommu_ops = { .unmap = intel_iommu_unmap, .iova_to_phys = intel_iommu_iova_to_phys, .domain_has_cap = intel_iommu_domain_has_cap, + .pgsize_bitmap = INTEL_IOMMU_PGSIZES, }; static void __devinit quirk_iommu_rwbf(struct pci_dev *dev) |