From 4680816be3362bdf6ac712cbdc6098c76febe78f Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 28 Oct 2016 13:58:48 +0100 Subject: [PATCH] drm/i915: Wait first for submission, before waiting for request completion In future patches, we will no longer be able to wait on a static global seqno and instead have to break our wait up into phases. First we wait for the global seqno assignment (upon submission to hardware), and once submitted we wait for the hardware to complete. Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-25-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_request.c | 51 +++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c index 16d38f87f0a7..03ae85a1eefb 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.c +++ b/drivers/gpu/drm/i915/i915_gem_request.c @@ -789,6 +789,49 @@ bool __i915_spin_request(const struct drm_i915_gem_request *req, return false; } +static long +__i915_request_wait_for_submit(struct drm_i915_gem_request *request, + unsigned int flags, + long timeout) +{ + const int state = flags & I915_WAIT_INTERRUPTIBLE ? + TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE; + wait_queue_head_t *q = &request->i915->gpu_error.wait_queue; + DEFINE_WAIT(reset); + DEFINE_WAIT(wait); + + if (flags & I915_WAIT_LOCKED) + add_wait_queue(q, &reset); + + do { + prepare_to_wait(&request->submit.wait, &wait, state); + + if (i915_sw_fence_done(&request->submit)) + break; + + if (flags & I915_WAIT_LOCKED && + i915_reset_in_progress(&request->i915->gpu_error)) { + __set_current_state(TASK_RUNNING); + i915_reset(request->i915); + reset_wait_queue(q, &reset); + continue; + } + + if (signal_pending_state(state, current)) { + timeout = -ERESTARTSYS; + break; + } + + timeout = io_schedule_timeout(timeout); + } while (timeout); + finish_wait(&request->submit.wait, &wait); + + if (flags & I915_WAIT_LOCKED) + remove_wait_queue(q, &reset); + + return timeout; +} + /** * i915_wait_request - wait until execution of request has finished * @req: the request to wait upon @@ -833,6 +876,14 @@ long i915_wait_request(struct drm_i915_gem_request *req, trace_i915_gem_request_wait_begin(req); + if (!i915_sw_fence_done(&req->submit)) { + timeout = __i915_request_wait_for_submit(req, flags, timeout); + if (timeout < 0) + goto complete; + + GEM_BUG_ON(!i915_sw_fence_done(&req->submit)); + } + /* Optimistic short spin before touching IRQs */ if (i915_spin_request(req, state, 5)) goto complete; -- 2.20.1