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Subject[PATCH 21/34] AMD IOMMU: add address allocation and deallocation functions
Date
This patch adds the address allocator to the AMD IOMMU code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 48 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 48 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 1d70f5e..69d8d02 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -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);
+}
+
--
1.5.3.7



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