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x86, AMD IOMMU: add mapping functions for scatter gather lists

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This patch adds the dma_ops functions for mapping and unmapping scatter gather
lists.

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 21:28:02 +02:00 committed by Ingo Molnar
parent 4da70b9e4f
commit 65b050adbf
1 changed files with 98 additions and 0 deletions
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98
arch/x86/kernel/amd_iommu.c
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@ -700,3 +700,101 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
spin_unlock_irqrestore(&domain->lock, flags);
}
static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
int nelems, int dir)
{
struct scatterlist *s;
int i;
for_each_sg(sglist, s, nelems, i) {
s->dma_address = (dma_addr_t)sg_phys(s);
s->dma_length = s->length;
}
return nelems;
}
static int map_sg(struct device *dev, struct scatterlist *sglist,
int nelems, int dir)
{
unsigned long flags;
struct amd_iommu *iommu;
struct protection_domain *domain;
u16 devid;
int i;
struct scatterlist *s;
phys_addr_t paddr;
int mapped_elems = 0;
get_device_resources(dev, &iommu, &domain, &devid);
if (!iommu || !domain)
return map_sg_no_iommu(dev, sglist, nelems, dir);
spin_lock_irqsave(&domain->lock, flags);
for_each_sg(sglist, s, nelems, i) {
paddr = sg_phys(s);
s->dma_address = __map_single(dev, iommu, domain->priv,
paddr, s->length, dir);
if (s->dma_address) {
s->dma_length = s->length;
mapped_elems++;
} else
goto unmap;
if (iommu_has_npcache(iommu))
iommu_flush_pages(iommu, domain->id, s->dma_address,
s->dma_length);
}
if (iommu->need_sync)
iommu_completion_wait(iommu);
out:
spin_unlock_irqrestore(&domain->lock, flags);
return mapped_elems;
unmap:
for_each_sg(sglist, s, mapped_elems, i) {
if (s->dma_address)
__unmap_single(iommu, domain->priv, s->dma_address,
s->dma_length, dir);
s->dma_address = s->dma_length = 0;
}
mapped_elems = 0;
goto out;
}
static void unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, int dir)
{
unsigned long flags;
struct amd_iommu *iommu;
struct protection_domain *domain;
struct scatterlist *s;
u16 devid;
int i;
if (!get_device_resources(dev, &iommu, &domain, &devid))
return;
spin_lock_irqsave(&domain->lock, flags);
for_each_sg(sglist, s, nelems, i) {
__unmap_single(iommu, domain->priv, s->dma_address,
s->dma_length, dir);
iommu_flush_pages(iommu, domain->id, s->dma_address,
s->dma_length);
s->dma_address = s->dma_length = 0;
}
if (iommu->need_sync)
iommu_completion_wait(iommu);
spin_unlock_irqrestore(&domain->lock, flags);
}