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iommu/vt-d: Allocate domain info for real DMA sub-devices

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Sub-devices of a real DMA device might exist on a separate segment than
the real DMA device and its IOMMU. These devices should still have a
valid device_domain_info, but the current dma alias model won't
allocate info for the subdevice.

This patch adds a segment member to struct device_domain_info and uses
the sub-device's BDF so that these sub-devices won't alias to other
devices.

Fixes: 2b0140c696 ("iommu/vt-d: Use pci_real_dma_dev() for mapping")
Cc: stable@vger.kernel.org # v5.6+
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200527165617.297470-3-jonathan.derrick@intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jon Derrick 2020-05-27 10:56:16 -06:00 committed by Joerg Roedel
parent 8038bdb855
commit 4fda230ecd
2 changed files with 16 additions and 4 deletions
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19
drivers/iommu/intel-iommu.c
View File

@ -2463,7 +2463,7 @@ dmar_search_domain_by_dev_info(int segment, int bus, int devfn)
struct device_domain_info *info;
list_for_each_entry(info, &device_domain_list, global)
if (info->iommu->segment == segment && info->bus == bus &&
if (info->segment == segment && info->bus == bus &&
info->devfn == devfn)
return info;
@ -2520,8 +2520,18 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
if (!info)
return NULL;
info->bus = bus;
info->devfn = devfn;
if (!dev_is_real_dma_subdevice(dev)) {
info->bus = bus;
info->devfn = devfn;
info->segment = iommu->segment;
} else {
struct pci_dev *pdev = to_pci_dev(dev);
info->bus = pdev->bus->number;
info->devfn = pdev->devfn;
info->segment = pci_domain_nr(pdev->bus);
}
info->ats_supported = info->pasid_supported = info->pri_supported = 0;
info->ats_enabled = info->pasid_enabled = info->pri_enabled = 0;
info->ats_qdep = 0;
@ -2561,7 +2571,8 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
if (!found) {
struct device_domain_info *info2;
info2 = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn);
info2 = dmar_search_domain_by_dev_info(info->segment, info->bus,
info->devfn);
if (info2) {
found = info2->domain;
info2->dev = dev;

1
include/linux/intel-iommu.h
View File

@ -609,6 +609,7 @@ struct device_domain_info {
struct list_head auxiliary_domains; /* auxiliary domains
* attached to this device
*/
u32 segment; /* PCI segment number */
u8 bus; /* PCI bus number */
u8 devfn; /* PCI devfn number */
u16 pfsid; /* SRIOV physical function source ID */