iommu/amd: Introduce per PCI segment unity map list

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Newer AMD systems can support multiple PCI segments. In order to support
multiple PCI segments IVMD table in IVRS structure is enhanced to
include pci segment id. Update ivmd_header structure to include "pci_seg".

Also introduce per PCI segment unity map list. It will replace global
amd_iommu_unity_map list.

Note that we have used "reserved" field in IVMD table to include "pci_seg
id" which was set to zero. It will take care of backward compatibility
(new kernel will work fine on older systems).

Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-10-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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This commit is contained in:

Vasant Hegde 2022-07-06 17:07:59 +05:30 • committed by Joerg Roedel

parent 99fc4ac3d2

commit b618ae6247

3 changed files with 34 additions and 17 deletions

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13

drivers/iommu/amd/amd_iommu_types.h

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30

drivers/iommu/amd/init.c

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8

drivers/iommu/amd/iommu.c

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