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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: Joerg 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: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-06-26 21:27:59 +02:00 committed by Ingo Molnar
parent ec487d1a11
commit b20ac0d4d6
1 changed files with 75 additions and 0 deletions
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75
arch/x86/kernel/amd_iommu.c
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@ -461,3 +461,78 @@ free_dma_dom:
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;
}