drm/i915/gt: Expose preempt reset timeout via sysfs

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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

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Chris Wilson 2020-02-28 13:17:15 +00:00

parent 72338a1f5e

commit db3d8338ba

2 changed files with 51 additions and 0 deletions

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3

drivers/gpu/drm/i915/Kconfig.profile

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48

drivers/gpu/drm/i915/gt/sysfs_engines.c

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