From c8a0e2aef61f1dade1ef5b3833e00e7ec6ad1c4c Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 3 May 2019 15:02:39 +0100 Subject: [PATCH] drm/i915: Acquire the signaler's timeline HWSP last Acquiring the signaler's timeline takes an active reference to their HWSP that we would like to avoid if possible, so take it after performing all of our allocations required to set up the fencing. The acquisition also provides the final check that the target has not already signaled allowing us to avoid the semaphore at the last moment. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20190503140239.32668-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_request.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index ae9ce46..e0be00c 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -851,13 +851,13 @@ emit_semaphore_wait(struct i915_request *to, if (err < 0) return err; - /* We need to pin the signaler's HWSP until we are finished reading. */ - err = i915_timeline_read_hwsp(from, to, &hwsp_offset); + /* Only submit our spinner after the signaler is running! */ + err = i915_request_await_execution(to, from, gfp); if (err) return err; - /* Only submit our spinner after the signaler is running! */ - err = i915_request_await_execution(to, from, gfp); + /* We need to pin the signaler's HWSP until we are finished reading. */ + err = i915_timeline_read_hwsp(from, to, &hwsp_offset); if (err) return err; -- 2.7.4