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Commit a73c1566 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Initialize new aperture range before making it visible 



Make sure the aperture range is fully initialized before it
is visible to the address allocator.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 7bfa5bd2

drivers/iommu/amd_iommu.c

+20 −13
Original line number Diff line number Diff line
@@ -1425,8 +1425,10 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 
			   bool populate, gfp_t gfp)

{

	int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT;

	struct amd_iommu *iommu;

	unsigned long i, old_size, pte_pgsize;

	struct aperture_range *range;

	struct amd_iommu *iommu;

	unsigned long flags;



#ifdef CONFIG_IOMMU_STRESS

	populate = false;
@@ -1435,17 +1437,17 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 
	if (index >= APERTURE_MAX_RANGES)

		return -ENOMEM;



	dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp);

	if (!dma_dom->aperture[index])

	range = kzalloc(sizeof(struct aperture_range), gfp);

	if (!range)

		return -ENOMEM;



	dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp);

	if (!dma_dom->aperture[index]->bitmap)

	range->bitmap = (void *)get_zeroed_page(gfp);

	if (!range->bitmap)

		goto out_free;



	dma_dom->aperture[index]->offset = dma_dom->aperture_size;

	range->offset = dma_dom->aperture_size;



	spin_lock_init(&dma_dom->aperture[index]->bitmap_lock);

	spin_lock_init(&range->bitmap_lock);



	if (populate) {

		unsigned long address = dma_dom->aperture_size;
@@ -1458,13 +1460,17 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 
			if (!pte)

				goto out_free;



			dma_dom->aperture[index]->pte_pages[i] = pte_page;

			range->pte_pages[i] = pte_page;



			address += APERTURE_RANGE_SIZE / 64;

		}

	}



	/* First take the bitmap_lock and then publish the range */

	spin_lock_irqsave(&range->bitmap_lock, flags);



	old_size                 = dma_dom->aperture_size;

	dma_dom->aperture[index] = range;

	dma_dom->aperture_size  += APERTURE_RANGE_SIZE;



	/* Reserve address range used for MSI messages */
@@ -1512,15 +1518,16 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 


	update_domain(&dma_dom->domain);



	spin_unlock_irqrestore(&range->bitmap_lock, flags);



	return 0;



out_free:

	update_domain(&dma_dom->domain);



	free_page((unsigned long)dma_dom->aperture[index]->bitmap);

	free_page((unsigned long)range->bitmap);



	kfree(dma_dom->aperture[index]);

	dma_dom->aperture[index] = NULL;

	kfree(range);



	return -ENOMEM;

}