AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

x86/amd-iommu: attach devices to pre-allocated domains early

Browse Source 
For some devices the ACPI table may define unity map
requirements which must me met when the IOMMU is enabled. So
we need to attach devices to their domains as early as
possible so that these mappings are in place when needed.
This patch assigns the domains right after they are
allocated. Otherwise this can result in I/O page faults
before a driver binds to a device and BIOS is still using
it.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-11-23 12:50:00 +01:00
parent 9f800de38b
commit be83129771
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/kernel/amd_iommu.c
View File

@ -2047,10 +2047,10 @@ static void prealloc_protection_domains(void)
struct pci_dev *dev = NULL;
struct dma_ops_domain *dma_dom;
struct amd_iommu *iommu;
u16 devid;
u16 devid, __devid;
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
devid = calc_devid(dev->bus->number, dev->devfn);
__devid = devid = calc_devid(dev->bus->number, dev->devfn);
if (devid > amd_iommu_last_bdf)
continue;
devid = amd_iommu_alias_table[devid];
@ -2065,6 +2065,10 @@ static void prealloc_protection_domains(void)
init_unity_mappings_for_device(dma_dom, devid);
dma_dom->target_dev = devid;
attach_device(iommu, &dma_dom->domain, devid);
if (__devid != devid)
attach_device(iommu, &dma_dom->domain, __devid);
list_add_tail(&dma_dom->list, &iommu_pd_list);
}
}