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iommu/amd: Introduce bitmap_lock in struct aperture_range

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This lock only protects the address allocation bitmap in one
aperture.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-12-21 13:04:49 +01:00
parent 007b74bab2
commit 08c5fb938e
1 changed files with 10 additions and 0 deletions
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10
drivers/iommu/amd_iommu.c
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@ -120,6 +120,8 @@ static int protection_domain_init(struct protection_domain *domain);
*/
struct aperture_range {
spinlock_t bitmap_lock;
/* address allocation bitmap */
unsigned long *bitmap;
@ -1436,6 +1438,8 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom,
dma_dom->aperture[index]->offset = dma_dom->aperture_size;
spin_lock_init(&dma_dom->aperture[index]->bitmap_lock);
if (populate) {
unsigned long address = dma_dom->aperture_size;
int i, num_ptes = APERTURE_RANGE_PAGES / 512;
@ -1527,6 +1531,7 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
unsigned long boundary_size, mask;
unsigned long address = -1;
unsigned long limit;
unsigned long flags;
next_bit >>= PAGE_SHIFT;
@ -1544,9 +1549,11 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset,
dma_mask >> PAGE_SHIFT);
spin_lock_irqsave(&dom->aperture[i]->bitmap_lock, flags);
address = iommu_area_alloc(dom->aperture[i]->bitmap,
limit, next_bit, pages, 0,
boundary_size, align_mask);
spin_unlock_irqrestore(&dom->aperture[i]->bitmap_lock, flags);
if (address != -1) {
address = dom->aperture[i]->offset +
(address << PAGE_SHIFT);
@ -1602,6 +1609,7 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
{
unsigned i = address >> APERTURE_RANGE_SHIFT;
struct aperture_range *range = dom->aperture[i];
unsigned long flags;
BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
@ -1615,7 +1623,9 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;
spin_lock_irqsave(&range->bitmap_lock, flags);
bitmap_clear(range->bitmap, address, pages);
spin_unlock_irqrestore(&range->bitmap_lock, flags);
}