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Commit 5d8b53cf authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
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x86, AMD IOMMU: add mapping functions for coherent mappings 



This patch adds the dma_ops functions for coherent mappings.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 65b050ad

arch/x86/kernel/amd_iommu.c

+74 −0
Original line number Diff line number Diff line
@@ -798,3 +798,77 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist, 
	spin_unlock_irqrestore(&domain->lock, flags);

}



static void *alloc_coherent(struct device *dev, size_t size,

			    dma_addr_t *dma_addr, gfp_t flag)

{

	unsigned long flags;

	void *virt_addr;

	struct amd_iommu *iommu;

	struct protection_domain *domain;

	u16 devid;

	phys_addr_t paddr;



	virt_addr = (void *)__get_free_pages(flag, get_order(size));

	if (!virt_addr)

		return 0;



	memset(virt_addr, 0, size);

	paddr = virt_to_phys(virt_addr);



	get_device_resources(dev, &iommu, &domain, &devid);



	if (!iommu || !domain) {

		*dma_addr = (dma_addr_t)paddr;

		return virt_addr;

	}



	spin_lock_irqsave(&domain->lock, flags);



	*dma_addr = __map_single(dev, iommu, domain->priv, paddr,

				 size, DMA_BIDIRECTIONAL);



	if (*dma_addr == bad_dma_address) {

		free_pages((unsigned long)virt_addr, get_order(size));

		virt_addr = NULL;

		goto out;

	}



	if (iommu_has_npcache(iommu))

		iommu_flush_pages(iommu, domain->id, *dma_addr, size);



	if (iommu->need_sync)

		iommu_completion_wait(iommu);



out:

	spin_unlock_irqrestore(&domain->lock, flags);



	return virt_addr;

}



static void free_coherent(struct device *dev, size_t size,

			  void *virt_addr, dma_addr_t dma_addr)

{

	unsigned long flags;

	struct amd_iommu *iommu;

	struct protection_domain *domain;

	u16 devid;



	get_device_resources(dev, &iommu, &domain, &devid);



	if (!iommu || !domain)

		goto free_mem;



	spin_lock_irqsave(&domain->lock, flags);



	__unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);

	iommu_flush_pages(iommu, domain->id, dma_addr, size);



	if (iommu->need_sync)

		iommu_completion_wait(iommu);



	spin_unlock_irqrestore(&domain->lock, flags);



free_mem:

	free_pages((unsigned long)virt_addr, get_order(size));

}