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authorJoerg Roedel <joerg.roedel@amd.com>2008-06-26 21:28:00 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-27 10:12:18 +0200
commitcb76c3229725c6dcae31da65e9ca57f434628c05 (patch)
tree5471ef8a2711af4aea46f967ad9cbf6643f0a0a4 /arch
parentb20ac0d4d6cff969d7074bbf02a1b86058df0804 (diff)
x86, AMD IOMMU: add generic dma_ops mapping functions
This patch adds the generic functions to map and unmap pages to a protection domain for dma_ops usage. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Cc: iommu@lists.linux-foundation.org Cc: bhavna.sarathy@amd.com Cc: Sebastian.Biemueller@amd.com Cc: robert.richter@amd.com Cc: joro@8bytes.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/amd_iommu.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 47e80b5814b..e00a3e7ba35 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -536,3 +536,108 @@ static int get_device_resources(struct device *dev,
return 1;
}
+static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
+ struct dma_ops_domain *dom,
+ unsigned long address,
+ phys_addr_t paddr,
+ int direction)
+{
+ u64 *pte, __pte;
+
+ WARN_ON(address > dom->aperture_size);
+
+ paddr &= PAGE_MASK;
+
+ pte = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
+ pte += IOMMU_PTE_L0_INDEX(address);
+
+ __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
+
+ if (direction == DMA_TO_DEVICE)
+ __pte |= IOMMU_PTE_IR;
+ else if (direction == DMA_FROM_DEVICE)
+ __pte |= IOMMU_PTE_IW;
+ else if (direction == DMA_BIDIRECTIONAL)
+ __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
+
+ WARN_ON(*pte);
+
+ *pte = __pte;
+
+ return (dma_addr_t)address;
+}
+
+static void dma_ops_domain_unmap(struct amd_iommu *iommu,
+ struct dma_ops_domain *dom,
+ unsigned long address)
+{
+ u64 *pte;
+
+ if (address >= dom->aperture_size)
+ return;
+
+ WARN_ON(address & 0xfffULL || address > dom->aperture_size);
+
+ pte = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
+ pte += IOMMU_PTE_L0_INDEX(address);
+
+ WARN_ON(!*pte);
+
+ *pte = 0ULL;
+}
+
+static dma_addr_t __map_single(struct device *dev,
+ struct amd_iommu *iommu,
+ struct dma_ops_domain *dma_dom,
+ phys_addr_t paddr,
+ size_t size,
+ int dir)
+{
+ dma_addr_t offset = paddr & ~PAGE_MASK;
+ dma_addr_t address, start;
+ unsigned int pages;
+ int i;
+
+ pages = to_pages(paddr, size);
+ paddr &= PAGE_MASK;
+
+ address = dma_ops_alloc_addresses(dev, dma_dom, pages);
+ if (unlikely(address == bad_dma_address))
+ goto out;
+
+ start = address;
+ for (i = 0; i < pages; ++i) {
+ dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
+ paddr += PAGE_SIZE;
+ start += PAGE_SIZE;
+ }
+ address += offset;
+
+out:
+ return address;
+}
+
+static void __unmap_single(struct amd_iommu *iommu,
+ struct dma_ops_domain *dma_dom,
+ dma_addr_t dma_addr,
+ size_t size,
+ int dir)
+{
+ dma_addr_t i, start;
+ unsigned int pages;
+
+ if ((dma_addr == 0) || (dma_addr + size > dma_dom->aperture_size))
+ return;
+
+ pages = to_pages(dma_addr, size);
+ dma_addr &= PAGE_MASK;
+ start = dma_addr;
+
+ for (i = 0; i < pages; ++i) {
+ dma_ops_domain_unmap(iommu, dma_dom, start);
+ start += PAGE_SIZE;
+ }
+
+ dma_ops_free_addresses(dma_dom, dma_addr, pages);
+}
+