diff options
| author | Jiang Liu | 2014-07-11 14:19:35 +0800 |
|---|---|---|
| committer | Joerg Roedel | 2014-07-23 16:04:47 +0200 |
| commit | 162d1b10d4d38065efec690c2b05ee90dfcf170c (patch) | |
| tree | c1852cabd78648e446da9089f86754dda3cabe04 /drivers/iommu | |
| parent | d41a4adb1b9208a0ee59e6b4752853c1dd27cc2c (diff) | |
iommu/vt-d: Introduce helper domain_pfn_within_range() to simplify code
Introduce helper function domain_pfn_within_range() to simplify code
and improve readability.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 0852b7021e4a..c9e65edaa2ad 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -549,6 +549,14 @@ static inline int domain_type_is_vm_or_si(struct dmar_domain *domain) DOMAIN_FLAG_STATIC_IDENTITY); } +static inline int domain_pfn_supported(struct dmar_domain *domain, + unsigned long pfn) +{ + int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; + + return !(addr_width < BITS_PER_LONG && pfn >> addr_width); +} + static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw) { unsigned long sagaw; @@ -822,14 +830,13 @@ out: static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain, unsigned long pfn, int *target_level) { - int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; struct dma_pte *parent, *pte = NULL; int level = agaw_to_level(domain->agaw); int offset; BUG_ON(!domain->pgd); - if (addr_width < BITS_PER_LONG && pfn >> addr_width) + if (!domain_pfn_supported(domain, pfn)) /* Address beyond IOMMU's addressing capabilities. */ return NULL; @@ -912,12 +919,11 @@ static void dma_pte_clear_range(struct dmar_domain *domain, unsigned long start_pfn, unsigned long last_pfn) { - int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; unsigned int large_page = 1; struct dma_pte *first_pte, *pte; - BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); - BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(!domain_pfn_supported(domain, start_pfn)); + BUG_ON(!domain_pfn_supported(domain, last_pfn)); BUG_ON(start_pfn > last_pfn); /* we don't need lock here; nobody else touches the iova range */ @@ -978,10 +984,8 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain, unsigned long start_pfn, unsigned long last_pfn) { - int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; - - BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); - BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(!domain_pfn_supported(domain, start_pfn)); + BUG_ON(!domain_pfn_supported(domain, last_pfn)); BUG_ON(start_pfn > last_pfn); dma_pte_clear_range(domain, start_pfn, last_pfn); @@ -1083,11 +1087,10 @@ struct page *domain_unmap(struct dmar_domain *domain, unsigned long start_pfn, unsigned long last_pfn) { - int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; struct page *freelist = NULL; - BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); - BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(!domain_pfn_supported(domain, start_pfn)); + BUG_ON(!domain_pfn_supported(domain, last_pfn)); BUG_ON(start_pfn > last_pfn); /* we don't need lock here; nobody else touches the iova range */ @@ -1974,12 +1977,11 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, { struct dma_pte *first_pte = NULL, *pte = NULL; phys_addr_t uninitialized_var(pteval); - int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; unsigned long sg_res; unsigned int largepage_lvl = 0; unsigned long lvl_pages = 0; - BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width); + BUG_ON(!domain_pfn_supported(domain, iov_pfn + nr_pages - 1)); if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) return -EINVAL; |