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| author | Babu Moger <babu.moger@amd.com> | 2025-11-12 18:57:31 -0600 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-11-21 22:49:42 +0100 |
| commit | 48068e565045ee0c77fdb34225ac6dedb5871fc2 (patch) | |
| tree | 2850d9ad679b7e6642dd1fe61c33ac30c82f742d /Documentation/filesystems | |
| parent | 556d2892aa715286d840a74216c8fff885559261 (diff) | |
| download | tip-48068e565045ee0c77fdb34225ac6dedb5871fc2.tar.gz | |
fs/resctrl: Introduce interface to display "io_alloc" support
Introduce the "io_alloc" resctrl file to the "info" area of a cache resource,
for example /sys/fs/resctrl/info/L3/io_alloc. "io_alloc" indicates support for
the "io_alloc" feature that allows direct insertion of data from I/O
devices into the cache.
Restrict exposing support for "io_alloc" to the L3 resource that is the only
resource where this feature can be backed by AMD's L3 Smart Data Cache
Injection Allocation Enforcement (SDCIAE). With that, the "io_alloc" file is
only visible to user space if the L3 resource supports "io_alloc".
Doing so makes the file visible for all cache resources though, for example
also L2 cache (if it supports cache allocation). As a consequence, add
capability for file to report expected "enabled" and "disabled", as well as
"not supported".
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://patch.msgid.link/e8b116a8f424128b227734bb1d433c14af478d90.1762995456.git.babu.moger@amd.com
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index d7a51cae6b26fd..108995640ca51d 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -137,6 +137,21 @@ related to allocation: "1": Non-contiguous 1s value in CBM is supported. +"io_alloc": + "io_alloc" enables system software to configure the portion of + the cache allocated for I/O traffic. File may only exist if the + system supports this feature on some of its cache resources. + + "disabled": + Resource supports "io_alloc" but the feature is disabled. + Portions of cache used for allocation of I/O traffic cannot + be configured. + "enabled": + Portions of cache used for allocation of I/O traffic + can be configured using "io_alloc_cbm". + "not supported": + Support not available for this resource. + Memory bandwidth(MB) subdirectory contains the following files with respect to allocation: |