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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: 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 21:28:04 +02:00 committed by Ingo Molnar
parent 5d8b53cf3f
commit c432f3df8e
1 changed files with 34 additions and 0 deletions
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34
arch/x86/kernel/amd_iommu.c
View File

@ -872,3 +872,37 @@ free_mem:
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);
}
}