drm/i915: Mark concurrent submissions with a weak-dependency

We recorded the dependencies for WAIT_FOR_SUBMIT in order that we could
correctly perform priority inheritance from the parallel branches to the
common trunk. However, for the purpose of timeslicing and reset
handling, the dependency is weak -- as we the pair of requests are
allowed to run in parallel and not in strict succession.

The real significance though is that this allows us to rearrange
groups of WAIT_FOR_SUBMIT linked requests along the single engine, and
so can resolve user level inter-batch scheduling dependencies from user
semaphores.

Fixes: c81471f5e95c ("drm/i915: Copy across scheduler behaviour flags across submit fences")
Testcase: igt/gem_exec_fence/submit
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: <stable@vger.kernel.org> # v5.6+
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200507155109.8892-1-chris@chris-wilson.co.uk
(cherry picked from commit 6b6cd2ebd8d071e55998e32b648bb8081f7f02bb)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 7742037..2dfaddb 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1721,6 +1721,9 @@ static void defer_request(struct i915_request *rq, struct list_head * const pl)
                        struct i915_request *w =
                                container_of(p->waiter, typeof(*w), sched);
 
+                       if (p->flags & I915_DEPENDENCY_WEAK)
+                               continue;
+
                        /* Leave semaphores spinning on the other engines */
                        if (w->engine != rq->engine)
                                continue;

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 182a299..e2b78db 100644 (file)
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1023,7 +1023,9 @@ i915_request_await_request(struct i915_request *to, struct i915_request *from)
        }
 
        if (to->engine->schedule) {
-               ret = i915_sched_node_add_dependency(&to->sched, &from->sched);
+               ret = i915_sched_node_add_dependency(&to->sched,
+                                                    &from->sched,
+                                                    I915_DEPENDENCY_EXTERNAL);
                if (ret < 0)
                        return ret;
        }
@@ -1185,7 +1187,9 @@ __i915_request_await_execution(struct i915_request *to,
 
        /* Couple the dependency tree for PI on this exposed to->fence */
        if (to->engine->schedule) {
-               err = i915_sched_node_add_dependency(&to->sched, &from->sched);
+               err = i915_sched_node_add_dependency(&to->sched,
+                                                    &from->sched,
+                                                    I915_DEPENDENCY_WEAK);
                if (err < 0)
                        return err;
        }

diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 68b06a7..f0a9e89 100644 (file)
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -456,7 +456,8 @@ bool __i915_sched_node_add_dependency(struct i915_sched_node *node,
 }
 
 int i915_sched_node_add_dependency(struct i915_sched_node *node,
-                                  struct i915_sched_node *signal)
+                                  struct i915_sched_node *signal,
+                                  unsigned long flags)
 {
        struct i915_dependency *dep;
 
@@ -465,8 +466,7 @@ int i915_sched_node_add_dependency(struct i915_sched_node *node,
                return -ENOMEM;
 
        if (!__i915_sched_node_add_dependency(node, signal, dep,
-                                             I915_DEPENDENCY_EXTERNAL |
-                                             I915_DEPENDENCY_ALLOC))
+                                             flags | I915_DEPENDENCY_ALLOC))
                i915_dependency_free(dep);
 
        return 0;

diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index d1dc4ef..6f0bf00 100644 (file)
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -34,7 +34,8 @@ bool __i915_sched_node_add_dependency(struct i915_sched_node *node,
                                      unsigned long flags);
 
 int i915_sched_node_add_dependency(struct i915_sched_node *node,
-                                  struct i915_sched_node *signal);
+                                  struct i915_sched_node *signal,
+                                  unsigned long flags);
 
 void i915_sched_node_fini(struct i915_sched_node *node);
 

diff --git a/drivers/gpu/drm/i915/i915_scheduler_types.h b/drivers/gpu/drm/i915/i915_scheduler_types.h
index d18e705..7186875 100644 (file)
--- a/drivers/gpu/drm/i915/i915_scheduler_types.h
+++ b/drivers/gpu/drm/i915/i915_scheduler_types.h
@@ -78,6 +78,7 @@ struct i915_dependency {
        unsigned long flags;
 #define I915_DEPENDENCY_ALLOC          BIT(0)
 #define I915_DEPENDENCY_EXTERNAL       BIT(1)
+#define I915_DEPENDENCY_WEAK           BIT(2)
 };
 
 #endif /* _I915_SCHEDULER_TYPES_H_ */