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x86, AMD IOMMU: add address allocation and deallocation functions

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This patch adds the address allocator to the AMD IOMMU code.

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 21:27:57 +02:00 committed by Ingo Molnar
parent bd0e521158
commit d3086444b2
1 changed files with 48 additions and 0 deletions
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48
arch/x86/kernel/amd_iommu.c
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@ -266,3 +266,51 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
return 0;
}
static unsigned long dma_mask_to_pages(unsigned long mask)
{
return (mask >> PAGE_SHIFT) +
(PAGE_ALIGN(mask & ~PAGE_MASK) >> PAGE_SHIFT);
}
static unsigned long dma_ops_alloc_addresses(struct device *dev,
struct dma_ops_domain *dom,
unsigned int pages)
{
unsigned long limit = dma_mask_to_pages(*dev->dma_mask);
unsigned long address;
unsigned long size = dom->aperture_size >> PAGE_SHIFT;
unsigned long boundary_size;
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
PAGE_SIZE) >> PAGE_SHIFT;
limit = limit < size ? limit : size;
if (dom->next_bit >= limit)
dom->next_bit = 0;
address = iommu_area_alloc(dom->bitmap, limit, dom->next_bit, pages,
0 , boundary_size, 0);
if (address == -1)
address = iommu_area_alloc(dom->bitmap, limit, 0, pages,
0, boundary_size, 0);
if (likely(address != -1)) {
set_bit_string(dom->bitmap, address, pages);
dom->next_bit = address + pages;
address <<= PAGE_SHIFT;
} else
address = bad_dma_address;
WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);
return address;
}
static void dma_ops_free_addresses(struct dma_ops_domain *dom,
unsigned long address,
unsigned int pages)
{
address >>= PAGE_SHIFT;
iommu_area_free(dom->bitmap, address, pages);
}