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Commit b20ac0d4 authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
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x86, AMD IOMMU: add functions to find IOMMU device resources 



This patch adds functions necessary to find the IOMMU resources for a specific
device.

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 ec487d1a

arch/x86/kernel/amd_iommu.c

+75 −0
Original line number Original line Diff line number Diff line
@@ -461,3 +461,78 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu, 
	return NULL;

	return NULL;

}

}





static struct protection_domain *domain_for_device(u16 devid)

{

	struct protection_domain *dom;

	unsigned long flags;



	read_lock_irqsave(&amd_iommu_devtable_lock, flags);

	dom = amd_iommu_pd_table[devid];

	read_unlock_irqrestore(&amd_iommu_devtable_lock, flags);



	return dom;

}



static void set_device_domain(struct amd_iommu *iommu,

			      struct protection_domain *domain,

			      u16 devid)

{

	unsigned long flags;



	u64 pte_root = virt_to_phys(domain->pt_root);



	pte_root |= (domain->mode & 0x07) << 9;

	pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | 2;



	write_lock_irqsave(&amd_iommu_devtable_lock, flags);

	amd_iommu_dev_table[devid].data[0] = pte_root;

	amd_iommu_dev_table[devid].data[1] = pte_root >> 32;

	amd_iommu_dev_table[devid].data[2] = domain->id;



	amd_iommu_pd_table[devid] = domain;

	write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);



	iommu_queue_inv_dev_entry(iommu, devid);



	iommu->need_sync = 1;

}



static int get_device_resources(struct device *dev,

				struct amd_iommu **iommu,

				struct protection_domain **domain,

				u16 *bdf)

{

	struct dma_ops_domain *dma_dom;

	struct pci_dev *pcidev;

	u16 _bdf;



	BUG_ON(!dev || dev->bus != &pci_bus_type || !dev->dma_mask);



	pcidev = to_pci_dev(dev);

	_bdf = (pcidev->bus->number << 8) | pcidev->devfn;



	if (_bdf >= amd_iommu_last_bdf) {

		*iommu = NULL;

		*domain = NULL;

		*bdf = 0xffff;

		return 0;

	}



	*bdf = amd_iommu_alias_table[_bdf];



	*iommu = amd_iommu_rlookup_table[*bdf];

	if (*iommu == NULL)

		return 0;

	dma_dom = (*iommu)->default_dom;

	*domain = domain_for_device(*bdf);

	if (*domain == NULL) {

		*domain = &dma_dom->domain;

		set_device_domain(*iommu, *domain, *bdf);

		printk(KERN_INFO "AMD IOMMU: Using protection domain %d for "

				"device ", (*domain)->id);

		print_devid(_bdf, 1);

	}



	return 1;

}