diff options
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index e7825b2..1bb59ae 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -63,6 +63,12 @@ #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT) #define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32)) +/* Reserved IOVA ranges */ +#define MSI_RANGE_START (0xfee00000) +#define MSI_RANGE_END (0xfeefffff) +#define HT_RANGE_START (0xfd00000000ULL) +#define HT_RANGE_END (0xffffffffffULL) + /* * This bitmap is used to advertise the page sizes our hardware support * to the IOMMU core, which will then use this information to split @@ -169,6 +175,9 @@ struct dma_ops_domain { struct iova_domain iovad; }; +static struct iova_domain reserved_iova_ranges; +static struct lock_class_key reserved_rbtree_key; + /**************************************************************************** * * Helper functions @@ -2058,6 +2067,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void) init_iova_domain(&dma_dom->iovad, PAGE_SIZE, IOVA_START_PFN, DMA_32BIT_PFN); + /* Initialize reserved ranges */ + copy_reserved_iova(&reserved_iova_ranges, &dma_dom->iovad); + return dma_dom; free_dma_dom: @@ -2963,6 +2975,59 @@ static struct dma_map_ops amd_iommu_dma_ops = { .set_dma_mask = set_dma_mask, }; +static int init_reserved_iova_ranges(void) +{ + struct pci_dev *pdev = NULL; + struct iova *val; + + init_iova_domain(&reserved_iova_ranges, PAGE_SIZE, + IOVA_START_PFN, DMA_32BIT_PFN); + + lockdep_set_class(&reserved_iova_ranges.iova_rbtree_lock, + &reserved_rbtree_key); + + /* MSI memory range */ + val = reserve_iova(&reserved_iova_ranges, + IOVA_PFN(MSI_RANGE_START), IOVA_PFN(MSI_RANGE_END)); + if (!val) { + pr_err("Reserving MSI range failed\n"); + return -ENOMEM; + } + + /* HT memory range */ + val = reserve_iova(&reserved_iova_ranges, + IOVA_PFN(HT_RANGE_START), IOVA_PFN(HT_RANGE_END)); + if (!val) { + pr_err("Reserving HT range failed\n"); + return -ENOMEM; + } + + /* + * Memory used for PCI resources + * FIXME: Check whether we can reserve the PCI-hole completly + */ + for_each_pci_dev(pdev) { + int i; + + for (i = 0; i < PCI_NUM_RESOURCES; ++i) { + struct resource *r = &pdev->resource[i]; + + if (!(r->flags & IORESOURCE_MEM)) + continue; + + val = reserve_iova(&reserved_iova_ranges, + IOVA_PFN(r->start), + IOVA_PFN(r->end)); + if (!val) { + pr_err("Reserve pci-resource range failed\n"); + return -ENOMEM; + } + } + } + + return 0; +} + int __init amd_iommu_init_api(void) { int ret, err = 0; @@ -2971,6 +3036,10 @@ int __init amd_iommu_init_api(void) if (ret) return ret; + ret = init_reserved_iova_ranges(); + if (ret) + return ret; + err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops); if (err) return err; |