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AMD IOMMU: align alloc_coherent addresses properly 

The API definition for dma_alloc_coherent states that the bus address
has to be aligned to the next power of 2 boundary greater than the
allocation size. This is violated by AMD IOMMU so far and this patch
fixes it.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-09-04 19:18:02 +02:00 committed by Ingo Molnar
parent 5507eef835
commit 6d4f343f84
1 changed files with 14 additions and 8 deletions
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22
arch/x86/kernel/amd_iommu.c
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@ -383,7 +383,8 @@ static unsigned long dma_mask_to_pages(unsigned long mask)
*/
static unsigned long dma_ops_alloc_addresses(struct device *dev,
struct dma_ops_domain *dom,
unsigned int pages)
unsigned int pages,
unsigned long align_mask)
{
unsigned long limit = dma_mask_to_pages(*dev->dma_mask);
unsigned long address;
@ -400,10 +401,10 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
}
address = iommu_area_alloc(dom->bitmap, limit, dom->next_bit, pages,
0 , boundary_size, 0);
0 , boundary_size, align_mask);
if (address == -1) {
address = iommu_area_alloc(dom->bitmap, limit, 0, pages,
0, boundary_size, 0);
0, boundary_size, align_mask);
dom->need_flush = true;
}
@ -787,17 +788,22 @@ static dma_addr_t __map_single(struct device *dev,
struct dma_ops_domain *dma_dom,
phys_addr_t paddr,
size_t size,
int dir)
int dir,
bool align)
{
dma_addr_t offset = paddr & ~PAGE_MASK;
dma_addr_t address, start;
unsigned int pages;
unsigned long align_mask = 0;
int i;
pages = iommu_num_pages(paddr, size);
paddr &= PAGE_MASK;
address = dma_ops_alloc_addresses(dev, dma_dom, pages);
if (align)
align_mask = (1UL << get_order(size)) - 1;
address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask);
if (unlikely(address == bad_dma_address))
goto out;
@ -872,7 +878,7 @@ static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
return (dma_addr_t)paddr;
spin_lock_irqsave(&domain->lock, flags);
addr = __map_single(dev, iommu, domain->priv, paddr, size, dir);
addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false);
if (addr == bad_dma_address)
goto out;
@ -959,7 +965,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
paddr = sg_phys(s);
s->dma_address = __map_single(dev, iommu, domain->priv,
paddr, s->length, dir);
paddr, s->length, dir, false);
if (s->dma_address) {
s->dma_length = s->length;
@ -1053,7 +1059,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
spin_lock_irqsave(&domain->lock, flags);
*dma_addr = __map_single(dev, iommu, domain->priv, paddr,
size, DMA_BIDIRECTIONAL);
size, DMA_BIDIRECTIONAL, true);
if (*dma_addr == bad_dma_address) {
free_pages((unsigned long)virt_addr, get_order(size));