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drm/i915: Update i915_scheduler to operate on i915_sched_engine

Browse source 
Rather passing around an intel_engine_cs in the scheduling code, pass
around a i915_sched_engine.

v3:
 (Jason Ekstrand)
  Add READ_ONCE around rq->engine in lock_sched_engine

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210618010638.98941-8-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2021-06-17 18:06:37 -07:00 committed by Matt Roper
parent 71ed60112d
commit d2a31d0264
4 changed files with 32 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
drivers/gpu/drm/i915/gt/intel_execlists_submission.c
View file

@ -382,7 +382,8 @@ __unwind_incomplete_requests(struct intel_engine_cs *engine)
GEM_BUG_ON(rq_prio(rq) == I915_PRIORITY_INVALID);
if (rq_prio(rq) != prio) {
prio = rq_prio(rq);
pl = i915_sched_lookup_priolist(engine, prio);
pl = i915_sched_lookup_priolist(engine->sched_engine,
prio);
}
GEM_BUG_ON(i915_sched_engine_is_empty(engine->sched_engine));
@ -1096,7 +1097,8 @@ static void defer_active(struct intel_engine_cs *engine)
if (!rq)
return;
defer_request(rq, i915_sched_lookup_priolist(engine, rq_prio(rq)));
defer_request(rq, i915_sched_lookup_priolist(engine->sched_engine,
rq_prio(rq)));
}
static bool
@ -2083,7 +2085,7 @@ static void __execlists_unhold(struct i915_request *rq)
i915_request_clear_hold(rq);
list_move_tail(&rq->sched.link,
i915_sched_lookup_priolist(rq->engine,
i915_sched_lookup_priolist(rq->engine->sched_engine,
rq_prio(rq)));
set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
@ -2452,7 +2454,8 @@ static void queue_request(struct intel_engine_cs *engine,
{
GEM_BUG_ON(!list_empty(&rq->sched.link));
list_add_tail(&rq->sched.link,
i915_sched_lookup_priolist(engine, rq_prio(rq)));
i915_sched_lookup_priolist(engine->sched_engine,
rq_prio(rq)));
set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
}

2
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
View file

@ -503,7 +503,7 @@ static inline void queue_request(struct intel_engine_cs *engine,
{
GEM_BUG_ON(!list_empty(&rq->sched.link));
list_add_tail(&rq->sched.link,
i915_sched_lookup_priolist(engine, prio));
i915_sched_lookup_priolist(engine->sched_engine, prio));
set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
}

46
drivers/gpu/drm/i915/i915_scheduler.c
View file

@ -61,14 +61,13 @@ static void assert_priolists(struct i915_sched_engine * const sched_engine)
}
struct list_head *
i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio)
i915_sched_lookup_priolist(struct i915_sched_engine *sched_engine, int prio)
{
struct i915_sched_engine * const sched_engine = engine->sched_engine;
struct i915_priolist *p;
struct rb_node **parent, *rb;
bool first = true;
lockdep_assert_held(&engine->sched_engine->lock);
lockdep_assert_held(&sched_engine->lock);
assert_priolists(sched_engine);
if (unlikely(sched_engine->no_priolist))
@ -130,13 +129,13 @@ struct sched_cache {
struct list_head *priolist;
};
static struct intel_engine_cs *
sched_lock_engine(const struct i915_sched_node *node,
struct intel_engine_cs *locked,
static struct i915_sched_engine *
lock_sched_engine(struct i915_sched_node *node,
struct i915_sched_engine *locked,
struct sched_cache *cache)
{
const struct i915_request *rq = node_to_request(node);
struct intel_engine_cs *engine;
struct i915_sched_engine *sched_engine;
GEM_BUG_ON(!locked);
@ -146,14 +145,14 @@ sched_lock_engine(const struct i915_sched_node *node,
* engine lock. The simple ploy we use is to take the lock then
* check that the rq still belongs to the newly locked engine.
*/
while (locked != (engine = READ_ONCE(rq->engine))) {
spin_unlock(&locked->sched_engine->lock);
while (locked != (sched_engine = READ_ONCE(rq->engine)->sched_engine)) {
spin_unlock(&locked->lock);
memset(cache, 0, sizeof(*cache));
spin_lock(&engine->sched_engine->lock);
locked = engine;
spin_lock(&sched_engine->lock);
locked = sched_engine;
}
GEM_BUG_ON(locked != engine);
GEM_BUG_ON(locked != sched_engine);
return locked;
}
@ -161,7 +160,7 @@ static void __i915_schedule(struct i915_sched_node *node,
const struct i915_sched_attr *attr)
{
const int prio = max(attr->priority, node->attr.priority);
struct intel_engine_cs *engine;
struct i915_sched_engine *sched_engine;
struct i915_dependency *dep, *p;
struct i915_dependency stack;
struct sched_cache cache;
@ -236,23 +235,24 @@ static void __i915_schedule(struct i915_sched_node *node,
}
memset(&cache, 0, sizeof(cache));
engine = node_to_request(node)->engine;
spin_lock(&engine->sched_engine->lock);
sched_engine = node_to_request(node)->engine->sched_engine;
spin_lock(&sched_engine->lock);
/* Fifo and depth-first replacement ensure our deps execute before us */
engine = sched_lock_engine(node, engine, &cache);
sched_engine = lock_sched_engine(node, sched_engine, &cache);
list_for_each_entry_safe_reverse(dep, p, &dfs, dfs_link) {
INIT_LIST_HEAD(&dep->dfs_link);
node = dep->signaler;
engine = sched_lock_engine(node, engine, &cache);
lockdep_assert_held(&engine->sched_engine->lock);
sched_engine = lock_sched_engine(node, sched_engine, &cache);
lockdep_assert_held(&sched_engine->lock);
/* Recheck after acquiring the engine->timeline.lock */
if (prio <= node->attr.priority || node_signaled(node))
continue;
GEM_BUG_ON(node_to_request(node)->engine != engine);
GEM_BUG_ON(node_to_request(node)->engine->sched_engine !=
sched_engine);
WRITE_ONCE(node->attr.priority, prio);
@ -270,17 +270,17 @@ static void __i915_schedule(struct i915_sched_node *node,
if (i915_request_in_priority_queue(node_to_request(node))) {
if (!cache.priolist)
cache.priolist =
i915_sched_lookup_priolist(engine,
i915_sched_lookup_priolist(sched_engine,
prio);
list_move_tail(&node->link, cache.priolist);
}
/* Defer (tasklet) submission until after all of our updates. */
if (engine->sched_engine->kick_backend)
engine->sched_engine->kick_backend(node_to_request(node), prio);
if (sched_engine->kick_backend)
sched_engine->kick_backend(node_to_request(node), prio);
}
spin_unlock(&engine->sched_engine->lock);
spin_unlock(&sched_engine->lock);
}
void i915_schedule(struct i915_request *rq, const struct i915_sched_attr *attr)

2
drivers/gpu/drm/i915/i915_scheduler.h
View file

@ -39,7 +39,7 @@ void i915_schedule(struct i915_request *request,
const struct i915_sched_attr *attr);
struct list_head *
i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio);
i915_sched_lookup_priolist(struct i915_sched_engine *sched_engine, int prio);
void __i915_priolist_free(struct i915_priolist *p);
static inline void i915_priolist_free(struct i915_priolist *p)