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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-28 13:17:15 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-28 22:03:46 +0000 |
| commit | db3d8338bacbfc734d246eaccfbe5b19ad81d7d4 (patch) | |
| tree | d358edbe0fd333e37bfcb3d895bd564ee7406e06 /drivers/gpu/drm/i915/Kconfig.profile | |
| parent | 72338a1f5ef8a480184aac48bcc8e9f7d4d0d0a5 (diff) | |
| download | linux-db3d8338bacbfc734d246eaccfbe5b19ad81d7d4.tar.bz2 | |
drm/i915/gt: Expose preempt reset timeout via sysfs
After initialising a preemption request, we give the current resident a
small amount of time to vacate the GPU. The preemption request is for a
higher priority context and should be immediate to maintain high
quality of service (and avoid priority inversion). However, the
preemption granularity of the GPU can be quite coarse and so we need a
compromise.
The preempt timeout can be adjusted per-engine using,
/sys/class/drm/card?/engine/*/preempt_timeout_ms
and can be disabled by setting it to 0.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Steve Carbonari <steven.carbonari@intel.com>
Tested-by: Steve Carbonari <steven.carbonari@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228131716.3243616-6-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/Kconfig.profile')
| -rw-r--r-- | drivers/gpu/drm/i915/Kconfig.profile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/Kconfig.profile b/drivers/gpu/drm/i915/Kconfig.profile index 5f4ec3aec1d2..1f4e98a8532f 100644 --- a/drivers/gpu/drm/i915/Kconfig.profile +++ b/drivers/gpu/drm/i915/Kconfig.profile @@ -33,6 +33,9 @@ config DRM_I915_PREEMPT_TIMEOUT expires, the HW will be reset to allow the more important context to execute. + This is adjustable via + /sys/class/drm/card?/engine/*/preempt_timeout_ms + May be 0 to disable the timeout. config DRM_I915_MAX_REQUEST_BUSYWAIT |