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Documentation/gpu: Document GFXOFF's count and residency

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Add documentation explaining those two new files.

While here, add a note about the value type.

Signed-off-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
André Almeida 2022-08-10 20:28:57 -03:00 committed by Alex Deucher
parent 1ed5a845c7
commit e76115963b
1 changed files with 17 additions and 1 deletions
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18
Documentation/gpu/amdgpu/thermal.rst
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@ -72,7 +72,8 @@ card's RLC (RunList Controller) firmware powers off the gfx engine
dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by
default on supported GPUs.
Userspace can interact with GFXOFF through a debugfs interface:
Userspace can interact with GFXOFF through a debugfs interface (all values in
`uint32_t`, unless otherwise noted):
``amdgpu_gfxoff``
-----------------
@ -104,3 +105,18 @@ Read it to check current GFXOFF's status of a GPU::
If GFXOFF is enabled, the value will be transitioning around [0, 3], always
getting into 0 when possible. When it's disabled, it's always at 2. Returns
``-EINVAL`` if it's not supported.
``amdgpu_gfxoff_count``
-----------------------
Read it to get the total GFXOFF entry count at the time of query since system
power-up. The value is an `uint64_t` type, however, due to firmware limitations,
it can currently overflow as an `uint32_t`. *Only supported in vangogh*
``amdgpu_gfxoff_residency``
---------------------------
Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to
get average GFXOFF residency % multiplied by 100 during the last logging
interval. E.g. a value of 7854 means 78.54% of the time in the last logging
interval the GPU was in GFXOFF mode. *Only supported in vangogh*