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drm/i915: Request watchdog infrastructure
authorTvrtko Ursulin <tvrtko.ursulin@intel.com>
Wed, 24 Mar 2021 12:13:33 +0000 (12:13 +0000)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Thu, 25 Mar 2021 23:58:52 +0000 (00:58 +0100)
commit9b4d0598ee940df33ea6cbbba8c80e951223131b
treee55bf9931bcc6033e9eb11974a7c67a4bbb65f3d
parent90a79a91dcc0e8b1986a2ad9b00cf3b281fb09f0
drm/i915: Request watchdog infrastructure

Prepares the plumbing for setting request/fence expiration time. All code
is put in place but is never activated due yet missing ability to actually
configure the timer.

Outline of the basic operation:

A timer is started when request is ready for execution. If the request
completes (retires) before the timer fires, timer is cancelled and nothing
further happens.

If the timer fires request is added to a lockless list and worker queued.
Purpose of this is twofold: a) It allows request cancellation from a more
friendly context and b) coalesces multiple expirations into a single event
of consuming the list.

Worker locklessly consumes the list of expired requests and cancels them
all using previous added i915_request_cancel().

Associated timeout value is stored in rq->context.watchdog.timeout_us.

v2:
 * Log expiration.

v3:
 * Include more information about user timeline in the log message.

v4:
 * Remove obsolete comment and fix formatting. (Matt)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210324121335.2307063-6-tvrtko.ursulin@linux.intel.com
drivers/gpu/drm/i915/gt/intel_context_types.h
drivers/gpu/drm/i915/gt/intel_execlists_submission.h
drivers/gpu/drm/i915/gt/intel_gt.c
drivers/gpu/drm/i915/gt/intel_gt.h
drivers/gpu/drm/i915/gt/intel_gt_requests.c
drivers/gpu/drm/i915/gt/intel_gt_types.h
drivers/gpu/drm/i915/i915_request.c
drivers/gpu/drm/i915/i915_request.h