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iommu/amd: Retry address allocation within one aperture 

Instead of skipping to the next aperture, first try again in
the current one.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-12-21 16:53:17 +01:00
parent ae62d49c7a
commit 60e6a7cb44
1 changed files with 19 additions and 10 deletions
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29
drivers/iommu/amd_iommu.c
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@ -125,6 +125,7 @@ struct aperture_range {
/* address allocation bitmap */
unsigned long *bitmap;
unsigned long offset;
unsigned long next_bit;
/*
* Array of PTE pages for the aperture. In this array we save all the
@ -1519,7 +1520,6 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom,
static dma_addr_t dma_ops_aperture_alloc(struct aperture_range *range,
unsigned long pages,
unsigned long next_bit,
unsigned long dma_mask,
unsigned long boundary_size,
unsigned long align_mask)
@ -1532,8 +1532,17 @@ static dma_addr_t dma_ops_aperture_alloc(struct aperture_range *range,
dma_mask >> PAGE_SHIFT);
spin_lock_irqsave(&range->bitmap_lock, flags);
address = iommu_area_alloc(range->bitmap, limit, next_bit, pages,
offset, boundary_size, align_mask);
address = iommu_area_alloc(range->bitmap, limit, range->next_bit,
pages, offset, boundary_size, align_mask);
if (address == -1)
/* Nothing found, retry one time */
address = iommu_area_alloc(range->bitmap, limit,
0, pages, offset, boundary_size,
align_mask);
if (address != -1)
range->next_bit = address + pages;
spin_unlock_irqrestore(&range->bitmap_lock, flags);
return address;
@ -1546,14 +1555,11 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
u64 dma_mask,
unsigned long start)
{
unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
int i = start >> APERTURE_RANGE_SHIFT;
unsigned long boundary_size, mask;
unsigned long next_bit, boundary_size, mask;
unsigned long address = -1;
next_bit >>= PAGE_SHIFT;
mask = dma_get_seg_boundary(dev);
boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT :
@ -1563,9 +1569,11 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
if (dom->aperture[i]->offset >= dma_mask)
break;
next_bit = dom->aperture[i]->next_bit;
address = dma_ops_aperture_alloc(dom->aperture[i], pages,
next_bit, dma_mask,
boundary_size, align_mask);
dma_mask, boundary_size,
align_mask);
if (address != -1) {
address = dom->aperture[i]->offset +
(address << PAGE_SHIFT);
@ -1573,7 +1581,8 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
break;
}
next_bit = 0;
if (next_bit > dom->aperture[i]->next_bit)
dom->need_flush = true;
}
return address;