x86, AMD IOMMU: add dma_ops mapping functions for single mappings

This patch adds the dma_ops specific mapping functions for single mappings.

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>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index e00a3e7..b4079f6 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -40,6 +40,11 @@ struct command {
 static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
                             struct unity_map_entry *e);
 
+static int iommu_has_npcache(struct amd_iommu *iommu)
+{
+       return iommu->cap & IOMMU_CAP_NPCACHE;
+}
+
 static int __iommu_queue_command(struct amd_iommu *iommu, struct command *cmd)
 {
        u32 tail, head;
@@ -641,3 +646,57 @@ static void __unmap_single(struct amd_iommu *iommu,
        dma_ops_free_addresses(dma_dom, dma_addr, pages);
 }
 
+static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
+                            size_t size, int dir)
+{
+       unsigned long flags;
+       struct amd_iommu *iommu;
+       struct protection_domain *domain;
+       u16 devid;
+       dma_addr_t addr;
+
+       get_device_resources(dev, &iommu, &domain, &devid);
+
+       if (iommu == NULL || domain == NULL)
+               return (dma_addr_t)paddr;
+
+       spin_lock_irqsave(&domain->lock, flags);
+       addr = __map_single(dev, iommu, domain->priv, paddr, size, dir);
+       if (addr == bad_dma_address)
+               goto out;
+
+       if (iommu_has_npcache(iommu))
+               iommu_flush_pages(iommu, domain->id, addr, size);
+
+       if (iommu->need_sync)
+               iommu_completion_wait(iommu);
+
+out:
+       spin_unlock_irqrestore(&domain->lock, flags);
+
+       return addr;
+}
+
+static void unmap_single(struct device *dev, dma_addr_t dma_addr,
+                        size_t size, int dir)
+{
+       unsigned long flags;
+       struct amd_iommu *iommu;
+       struct protection_domain *domain;
+       u16 devid;
+
+       if (!get_device_resources(dev, &iommu, &domain, &devid))
+               return;
+
+       spin_lock_irqsave(&domain->lock, flags);
+
+       __unmap_single(iommu, domain->priv, dma_addr, size, dir);
+
+       iommu_flush_pages(iommu, domain->id, dma_addr, size);
+
+       if (iommu->need_sync)
+               iommu_completion_wait(iommu);
+
+       spin_unlock_irqrestore(&domain->lock, flags);
+}
+