[PATCH 3/6] drm/i915: Keep a count of requests submitted from userspace

Tvrtko Ursulin
2018-02-12T18:57:54Z

Keep a count of requests submitted from userspace and not yet runnable due
unresolved dependencies.

v2: Rename and move under the container struct. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
drivers/gpu/drm/i915/i915_gem_request.c | 3 +++
drivers/gpu/drm/i915/intel_engine_cs.c | 3 ++-
drivers/gpu/drm/i915/intel_ringbuffer.h | 8 ++++++++
3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 19b8714a8d2f..9bb74836c602 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -610,6 +610,7 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
rcu_read_lock();
request->engine->submit_request(request);
rcu_read_unlock();
+ atomic_dec(&request->engine->request_stats.queued);
break;

case FENCE_FREE:
@@ -1083,6 +1084,8 @@ void __i915_add_request(struct drm_i915_gem_request *request, bool flush_caches)
if (engine->schedule)
engine->schedule(request, request->ctx->priority);

+ atomic_inc(&engine->request_stats.queued);
+
local_bh_disable();
i915_sw_fence_commit(&request->submit);
local_bh_enable(); /* Kick the execlists tasklet if just scheduled */
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index da5b592ce49f..e861b5404a78 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1727,12 +1727,13 @@ void intel_engine_dump(struct intel_engine_cs *engine,
if (i915_terminally_wedged(&engine->i915->gpu_error))
drm_printf(m, "*** WEDGED ***\n");

- drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d, runnable %u\n",
+ drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d, queued %u, runnable %u\n",
intel_engine_get_seqno(engine),
intel_engine_last_submit(engine),
engine->hangcheck.seqno,
jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp),
engine->timeline->inflight_seqnos,
+ atomic_read(&engine->request_stats.queued),
engine->request_stats.runnable);
drm_printf(m, "\tReset count: %d (global %d)\n",
i915_reset_engine_count(error, engine),
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 43942cd17212..6309e761bf69 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -311,6 +311,14 @@ struct intel_engine_cs {
struct drm_i915_gem_object *default_state;

struct {
+ /**
+ * @queued: Number of submitted requests with dependencies.
+ *
+ * Count of requests waiting for dependencies before they can be
+ * submitted to the backend.
+ */
+ atomic_t queued;
+
/**
* @runnable: Number of runnable requests sent to the backend.