[Intel-gfx] [PATCH 1/2] drm/i915: Individual request cancellation
Chris Wilson
chris at chris-wilson.co.uk
Mon Dec 14 12:31:25 UTC 2020
Currently, we cancel outstanding requests within a context when the
context is closed. We may also want to cancel individual requests using
the same graceful preemption mechanism.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
.../gpu/drm/i915/gt/intel_engine_heartbeat.c | 1 +
.../drm/i915/gt/intel_execlists_submission.c | 9 +-
drivers/gpu/drm/i915/i915_request.c | 62 ++++++-
drivers/gpu/drm/i915/i915_request.h | 4 +-
drivers/gpu/drm/i915/selftests/i915_request.c | 170 ++++++++++++++++++
5 files changed, 240 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
index 9060385cd69e..351c3431786d 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
@@ -267,6 +267,7 @@ int intel_engine_pulse(struct intel_engine_cs *engine)
mutex_unlock(&ce->timeline->mutex);
}
+ intel_engine_flush_submission(engine);
intel_engine_pm_put(engine);
return err;
}
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index dcecc2887891..fd3b170ec4ff 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -1309,6 +1309,11 @@ static void intel_context_update_runtime(struct intel_context *ce)
ce->runtime.total += dt;
}
+static bool bad_request(const struct i915_request *rq)
+{
+ return rq->fence.error && i915_request_started(rq);
+}
+
static inline struct intel_engine_cs *
__execlists_schedule_in(struct i915_request *rq)
{
@@ -1317,7 +1322,7 @@ __execlists_schedule_in(struct i915_request *rq)
intel_context_get(ce);
- if (unlikely(intel_context_is_banned(ce)))
+ if (unlikely(intel_context_is_banned(ce) || bad_request(rq)))
reset_active(rq, engine);
if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
@@ -2008,7 +2013,7 @@ static unsigned long active_preempt_timeout(struct intel_engine_cs *engine,
return 0;
/* Force a fast reset for terminated contexts (ignoring sysfs!) */
- if (unlikely(intel_context_is_banned(rq->context)))
+ if (unlikely(intel_context_is_banned(rq->context) || bad_request(rq)))
return 1;
return READ_ONCE(engine->props.preempt_timeout_ms);
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index a9db1376b996..45e53001e386 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -33,6 +33,9 @@
#include "gem/i915_gem_context.h"
#include "gt/intel_breadcrumbs.h"
#include "gt/intel_context.h"
+#include "gt/intel_engine.h"
+#include "gt/intel_engine_heartbeat.h"
+#include "gt/intel_reset.h"
#include "gt/intel_ring.h"
#include "gt/intel_rps.h"
@@ -498,20 +501,22 @@ void __i915_request_skip(struct i915_request *rq)
rq->infix = rq->postfix;
}
-void i915_request_set_error_once(struct i915_request *rq, int error)
+bool i915_request_set_error_once(struct i915_request *rq, int error)
{
int old;
GEM_BUG_ON(!IS_ERR_VALUE((long)error));
if (i915_request_signaled(rq))
- return;
+ return false;
old = READ_ONCE(rq->fence.error);
do {
if (fatal_error(old))
- return;
+ return false;
} while (!try_cmpxchg(&rq->fence.error, &old, error));
+
+ return true;
}
bool __i915_request_submit(struct i915_request *request)
@@ -669,6 +674,57 @@ void i915_request_unsubmit(struct i915_request *request)
spin_unlock_irqrestore(&engine->active.lock, flags);
}
+static struct intel_engine_cs *active_engine(struct i915_request *rq)
+{
+ struct intel_engine_cs *engine, *locked;
+
+ locked = READ_ONCE(rq->engine);
+ spin_lock_irq(&locked->active.lock);
+ while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) {
+ spin_unlock(&locked->active.lock);
+ locked = engine;
+ spin_lock(&locked->active.lock);
+ }
+
+ engine = NULL;
+ if (i915_request_is_active(rq) && !i915_request_completed(rq))
+ engine = locked;
+
+ spin_unlock_irq(&locked->active.lock);
+
+ return engine;
+}
+
+static void __cancel_request(struct i915_request *rq)
+{
+ struct intel_engine_cs *engine = active_engine(rq);
+
+ if (engine && intel_engine_pulse(engine))
+ intel_gt_handle_error(engine->gt, engine->mask, 0,
+ "request cancellation by %s",
+ current->comm);
+}
+
+void i915_request_cancel(struct i915_request *rq, int error)
+{
+ if (!i915_request_set_error_once(rq, error))
+ return;
+
+ if (i915_sw_fence_signaled(&rq->submit)) {
+ struct i915_dependency *p;
+
+ for_each_waiter(p, rq) {
+ struct i915_request *w =
+ container_of(p->waiter, typeof(*w), sched);
+
+ /* Recursion is bounded by the number of engines */
+ i915_request_cancel(w, error);
+ }
+ }
+
+ __cancel_request(rq);
+}
+
static int __i915_sw_fence_call
submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
{
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 92e4320c50c4..692e302047f9 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -309,7 +309,7 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp);
struct i915_request * __must_check
i915_request_create(struct intel_context *ce);
-void i915_request_set_error_once(struct i915_request *rq, int error);
+bool i915_request_set_error_once(struct i915_request *rq, int error);
void __i915_request_skip(struct i915_request *rq);
struct i915_request *__i915_request_commit(struct i915_request *request);
@@ -364,6 +364,8 @@ void i915_request_submit(struct i915_request *request);
void __i915_request_unsubmit(struct i915_request *request);
void i915_request_unsubmit(struct i915_request *request);
+void i915_request_cancel(struct i915_request *rq, int error);
+
long i915_request_wait(struct i915_request *rq,
unsigned int flags,
long timeout)
diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c
index e424a6d1a68c..cdd0c34e4f62 100644
--- a/drivers/gpu/drm/i915/selftests/i915_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_request.c
@@ -608,6 +608,175 @@ static int live_nop_request(void *arg)
return err;
}
+static int __cancel_inactive(struct intel_engine_cs *engine)
+{
+ struct intel_context *ce;
+ struct igt_spinner spin;
+ struct i915_request *rq;
+ int err = 0;
+
+ if (igt_spinner_init(&spin, engine->gt))
+ return -ENOMEM;
+
+ ce = intel_context_create(engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ goto out_spin;
+ }
+
+ rq = igt_spinner_create_request(&spin, ce, MI_ARB_CHECK);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto out_ce;
+ }
+
+ pr_debug("%s: Cancelling inactive request\n", engine->name);
+ i915_request_cancel(rq, -EINTR);
+ i915_request_add(rq);
+
+ if (i915_request_wait(rq, 0, HZ / 5) < 0) {
+ struct drm_printer p = drm_info_printer(engine->i915->drm.dev);
+
+ pr_err("Failed to cancel inactive request\n");
+ intel_engine_dump(engine, &p, "%s\n", engine->name);
+ err = -ETIME;
+ goto out_ce;
+ }
+
+ if (rq->fence.error != -EINTR)
+ err = -EINVAL;
+
+out_ce:
+ intel_context_put(ce);
+out_spin:
+ igt_spinner_fini(&spin);
+ return err;
+}
+
+static int __cancel_active(struct intel_engine_cs *engine)
+{
+ struct intel_context *ce;
+ struct igt_spinner spin;
+ struct i915_request *rq;
+ int err = 0;
+
+ if (igt_spinner_init(&spin, engine->gt))
+ return -ENOMEM;
+
+ ce = intel_context_create(engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ goto out_spin;
+ }
+
+ rq = igt_spinner_create_request(&spin, ce, MI_ARB_CHECK);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto out_ce;
+ }
+
+ pr_debug("%s: Cancelling active request\n", engine->name);
+ i915_request_add(rq);
+ i915_request_cancel(rq, -EINTR);
+
+ if (i915_request_wait(rq, 0, HZ / 5) < 0) {
+ struct drm_printer p = drm_info_printer(engine->i915->drm.dev);
+
+ pr_err("Failed to cancel active request\n");
+ intel_engine_dump(engine, &p, "%s\n", engine->name);
+ err = -ETIME;
+ goto out_ce;
+ }
+
+ if (rq->fence.error != -EINTR)
+ err = -EINVAL;
+
+out_ce:
+ intel_context_put(ce);
+out_spin:
+ igt_spinner_fini(&spin);
+ return err;
+}
+
+static int __cancel_completed(struct intel_engine_cs *engine)
+{
+ struct intel_context *ce;
+ struct igt_spinner spin;
+ struct i915_request *rq;
+ int err = 0;
+
+ if (igt_spinner_init(&spin, engine->gt))
+ return -ENOMEM;
+
+ ce = intel_context_create(engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ goto out_spin;
+ }
+
+ rq = igt_spinner_create_request(&spin, ce, MI_ARB_CHECK);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto out_ce;
+ }
+ igt_spinner_end(&spin);
+ i915_request_add(rq);
+
+ if (i915_request_wait(rq, 0, HZ / 5) < 0) {
+ err = -ETIME;
+ goto out_ce;
+ }
+
+ pr_debug("%s: Cancelling completed request\n", engine->name);
+ i915_request_cancel(rq, -EINTR);
+ if (rq->fence.error)
+ err = -EINVAL;
+
+out_ce:
+ intel_context_put(ce);
+out_spin:
+ igt_spinner_fini(&spin);
+ return err;
+}
+
+
+static int live_cancel_request(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct intel_engine_cs *engine;
+
+ /*
+ * Check cancellation of requests. We expect to be able to immediately
+ * cancel active requests, even if they are currently on the GPU.
+ */
+
+ for_each_uabi_engine(engine, i915) {
+ struct igt_live_test t;
+ int err, err2;
+
+ if (!intel_engine_has_preemption(engine))
+ continue;
+
+ err = igt_live_test_begin(&t, i915, __func__, engine->name);
+ if (err)
+ return err;
+
+ err = __cancel_inactive(engine);
+ if (err == 0)
+ err = __cancel_active(engine);
+ if (err == 0)
+ err = __cancel_completed(engine);
+
+ err2 = igt_live_test_end(&t);
+ if (err)
+ return err;
+ if (err2)
+ return err2;
+ }
+
+ return 0;
+}
+
static struct i915_vma *empty_batch(struct drm_i915_private *i915)
{
struct drm_i915_gem_object *obj;
@@ -1485,6 +1654,7 @@ int i915_request_live_selftests(struct drm_i915_private *i915)
SUBTEST(live_sequential_engines),
SUBTEST(live_parallel_engines),
SUBTEST(live_empty_request),
+ SUBTEST(live_cancel_request),
SUBTEST(live_breadcrumbs_smoketest),
};
--
2.20.1
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