iommu/amd: Improving Interrupt Remapping Table Invalidation

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Invalidating Interrupt Remapping Table (IRT) requires, the AMD IOMMU driver
to issue INVALIDATE_INTERRUPT_TABLE and COMPLETION_WAIT commands.
Currently, the driver issues the two commands separately, which requires
calling raw_spin_lock_irqsave() twice. In addition, the COMPLETION_WAIT
could potentially be interleaved with other commands causing delay of
the COMPLETION_WAIT command.

Therefore, combine issuing of the two commands in one spin-lock, and
changing struct amd_iommu.cmd_sem_val to use atomic64 to minimize
locking.

Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20230530141137.14376-6-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Suravee Suthikulpanit 2023-05-30 10:11:37 -04:00 • committed by Joerg Roedel

parent 98aeb4ea55

commit bccc37a8a2

3 changed files with 24 additions and 7 deletions

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2

drivers/iommu/amd/amd_iommu_types.h

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2

drivers/iommu/amd/init.c

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27

drivers/iommu/amd/iommu.c

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