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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-06-26 21:28:04 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-27 10:12:20 +0200 |
| commit | c432f3df8ea740e2ecb27da88bd6b5a254714959 (patch) | |
| tree | df10967104c41c0e2c1a65e33a3ecdf51f58060d /arch/x86 | |
| parent | 5d8b53cf3f8762b2230fb3d5b4e2ff78c5e701d8 (diff) | |
| download | kernel_goldelico_gta04-c432f3df8ea740e2ecb27da88bd6b5a254714959.zip kernel_goldelico_gta04-c432f3df8ea740e2ecb27da88bd6b5a254714959.tar.gz kernel_goldelico_gta04-c432f3df8ea740e2ecb27da88bd6b5a254714959.tar.bz2 | |
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index aab9125..bed5f82 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -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); + } +} + |