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x86, AMD IOMMU: add mapping functions for coherent mappings

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This patch adds the dma_ops functions for coherent 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>
This commit is contained in:
Joerg Roedel 2008-06-26 21:28:03 +02:00 committed by Ingo Molnar
parent 65b050adbf
commit 5d8b53cf3f
1 changed files with 74 additions and 0 deletions
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74
arch/x86/kernel/amd_iommu.c
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@ -798,3 +798,77 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
spin_unlock_irqrestore(&domain->lock, flags);
}
static void *alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_addr, gfp_t flag)
{
unsigned long flags;
void *virt_addr;
struct amd_iommu *iommu;
struct protection_domain *domain;
u16 devid;
phys_addr_t paddr;
virt_addr = (void *)__get_free_pages(flag, get_order(size));
if (!virt_addr)
return 0;
memset(virt_addr, 0, size);
paddr = virt_to_phys(virt_addr);
get_device_resources(dev, &iommu, &domain, &devid);
if (!iommu || !domain) {
*dma_addr = (dma_addr_t)paddr;
return virt_addr;
}
spin_lock_irqsave(&domain->lock, flags);
*dma_addr = __map_single(dev, iommu, domain->priv, paddr,
size, DMA_BIDIRECTIONAL);
if (*dma_addr == bad_dma_address) {
free_pages((unsigned long)virt_addr, get_order(size));
virt_addr = NULL;
goto out;
}
if (iommu_has_npcache(iommu))
iommu_flush_pages(iommu, domain->id, *dma_addr, size);
if (iommu->need_sync)
iommu_completion_wait(iommu);
out:
spin_unlock_irqrestore(&domain->lock, flags);
return virt_addr;
}
static void free_coherent(struct device *dev, size_t size,
void *virt_addr, dma_addr_t dma_addr)
{
unsigned long flags;
struct amd_iommu *iommu;
struct protection_domain *domain;
u16 devid;
get_device_resources(dev, &iommu, &domain, &devid);
if (!iommu || !domain)
goto free_mem;
spin_lock_irqsave(&domain->lock, flags);
__unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
iommu_flush_pages(iommu, domain->id, dma_addr, size);
if (iommu->need_sync)
iommu_completion_wait(iommu);
spin_unlock_irqrestore(&domain->lock, flags);
free_mem:
free_pages((unsigned long)virt_addr, get_order(size));
}