Commit 1b8655bb authored by Nicolin Chen's avatar Nicolin Chen Committed by Will Deacon
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ACPICA: IORT: Update for revision E.f

ACPICA commit c4f5c083d24df9ddd71d5782c0988408cf0fc1ab

The IORT spec, Issue E.f (April 2024), adds a new CANWBS bit to the Memory
Access Flag field in the Memory Access Properties table, mainly for a PCI
Root Complex.

This CANWBS defines the coherency of memory accesses to be not marked IOWB
cacheable/shareable. Its value further implies the coherency impact from a
pair of mismatched memory attributes (e.g. in a nested translation case):
  0x0: Use of mismatched memory attributes for accesses made by this
       device may lead to a loss of coherency.
  0x1: Coherency of accesses made by this device to locations in
       Conventional memory are ensured as follows, even if the memory
       attributes for the accesses presented by the device or provided by
       the SMMU are different from Inner and Outer Write-back cacheable,
       Shareable.

Link: https://github.com/acpica/acpica/commit/c4f5c083


Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarNicolin Chen <nicolinc@nvidia.com>
Acked-by: default avatarHanjun Guo <guohanjun@huawei.com>
Tested-by: default avatarNicolin Chen <nicolinc@nvidia.com>
Reviewed-by: default avatarJerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: default avatarDonald Dutile <ddutile@redhat.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v4-9e99b76f3518+3a8-smmuv3_nesting_jgg@nvidia.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 35890f85
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