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Commit c432f3df authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
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x86, AMD IOMMU: add pre-allocation of protection domains 



This patch adds a function to pre-allocate protection domains. So we don't have
to allocate it on the first request for a device (which can happen in atomic
mode).

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 5d8b53cf

arch/x86/kernel/amd_iommu.c

+34 −0
Original line number Diff line number Diff line
@@ -872,3 +872,37 @@ static void free_coherent(struct device *dev, size_t size, 
	free_pages((unsigned long)virt_addr, get_order(size));

}



/*

 * If the driver core informs the DMA layer if a driver grabs a device

 * we don't need to preallocate the protection domains anymore.

 * For now we have to.

 */

void prealloc_protection_domains(void)

{

	struct pci_dev *dev = NULL;

	struct dma_ops_domain *dma_dom;

	struct amd_iommu *iommu;

	int order = amd_iommu_aperture_order;

	u16 devid;



	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {

		devid = (dev->bus->number << 8) | dev->devfn;

		if (devid >= amd_iommu_last_bdf)

			continue;

		devid = amd_iommu_alias_table[devid];

		if (domain_for_device(devid))

			continue;

		iommu = amd_iommu_rlookup_table[devid];

		if (!iommu)

			continue;

		dma_dom = dma_ops_domain_alloc(iommu, order);

		if (!dma_dom)

			continue;

		init_unity_mappings_for_device(dma_dom, devid);

		set_device_domain(iommu, &dma_dom->domain, devid);

		printk(KERN_INFO "AMD IOMMU: Allocated domain %d for device ",

		       dma_dom->domain.id);

		print_devid(devid, 1);

	}

}