From: Joerg Roedel <[email protected]> This lock only protects the address allocation bitmap in one aperture.
Signed-off-by: Joerg Roedel <[email protected]> --- drivers/iommu/amd_iommu.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 9ce51eb..8ff3331 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -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); } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
