Inject a failure into preemption completion to pretend as if the HW
didn't successfully handle preemption and we are forced to do a reset in
the middle.
v2: Wait for preemption, to force testing with the missed preemption.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_guc_submission.c | 3 +
drivers/gpu/drm/i915/intel_lrc.c | 3 +
drivers/gpu/drm/i915/intel_ringbuffer.h | 27 +++++
drivers/gpu/drm/i915/selftests/intel_lrc.c | 115 ++++++++++++++++++++
4 files changed, 148 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 94d0674ea3c6..0fa1eb0bfff5 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -628,6 +628,9 @@ static void complete_preempt_context(struct intel_engine_cs *engine)
GEM_BUG_ON(!execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT));
+ if (inject_preempt_hang(execlists))
+ return;
+
execlists_cancel_port_requests(execlists);
execlists_unwind_incomplete_requests(execlists);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 1fe5481470c3..8a7d5c12d8aa 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -559,6 +559,9 @@ static void complete_preempt_context(struct intel_engine_execlists *execlists)
{
GEM_BUG_ON(!execlists_is_active(execlists, EXECLISTS_ACTIVE_PREEMPT));
+ if (inject_preempt_hang(execlists))
+ return;
+
execlists_cancel_port_requests(execlists);
__unwind_incomplete_requests(container_of(execlists,
struct intel_engine_cs,
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index d1eee08e5f6b..85792de154b9 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -193,6 +193,11 @@ struct i915_priolist {
int priority;
};
+struct st_preempt_hang {
+ struct completion completion;
+ bool inject_hang;
+};
+
/**
* struct intel_engine_execlists - execlist submission queue and port state
*
@@ -333,6 +338,8 @@ struct intel_engine_execlists {
* @csb_head: context status buffer head
*/
u8 csb_head;
+
+ I915_SELFTEST_DECLARE(struct st_preempt_hang preempt_hang;)
};
#define INTEL_ENGINE_CS_MAX_NAME 8
@@ -1149,4 +1156,24 @@ void intel_disable_engine_stats(struct intel_engine_cs *engine);
ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine);
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+
+static inline bool inject_preempt_hang(struct intel_engine_execlists *execlists)
+{
+ if (!execlists->preempt_hang.inject_hang)
+ return false;
+
+ completion_done(&execlists->preempt_hang.completion);
+ return true;
+}
+
+#else
+
+static inline bool inject_preempt_hang(struct intel_engine_execlists *execlists)
+{
+ return false;
+}
+
+#endif
+
#endif /* _INTEL_RINGBUFFER_H_ */
diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c
index 636cb68191e3..1843d331f4f1 100644
--- a/drivers/gpu/drm/i915/selftests/intel_lrc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c
@@ -451,12 +451,127 @@ static int live_late_preempt(void *arg)
goto err_ctx_lo;
}
+static int live_preempt_hang(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct i915_gem_context *ctx_hi, *ctx_lo;
+ struct spinner spin_hi, spin_lo;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ int err = -ENOMEM;
+
+ if (!HAS_LOGICAL_RING_PREEMPTION(i915))
+ return 0;
+
+ if (!intel_has_reset_engine(i915))
+ return 0;
+
+ mutex_lock(&i915->drm.struct_mutex);
+
+ if (spinner_init(&spin_hi, i915))
+ goto err_unlock;
+
+ if (spinner_init(&spin_lo, i915))
+ goto err_spin_hi;
+
+ ctx_hi = kernel_context(i915);
+ if (!ctx_hi)
+ goto err_spin_lo;
+ ctx_hi->sched.priority = I915_CONTEXT_MAX_USER_PRIORITY;
+
+ ctx_lo = kernel_context(i915);
+ if (!ctx_lo)
+ goto err_ctx_hi;
+ ctx_lo->sched.priority = I915_CONTEXT_MIN_USER_PRIORITY;
+
+ for_each_engine(engine, i915, id) {
+ struct i915_request *rq;
+
+ if (!intel_engine_has_preemption(engine))
+ continue;
+
+ rq = spinner_create_request(&spin_lo, ctx_lo, engine,
+ MI_ARB_CHECK);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto err_ctx_lo;
+ }
+
+ i915_request_add(rq);
+ if (!wait_for_spinner(&spin_lo, rq)) {
+ GEM_TRACE("lo spinner failed to start\n");
+ GEM_TRACE_DUMP();
+ i915_gem_set_wedged(i915);
+ err = -EIO;
+ goto err_ctx_lo;
+ }
+
+ rq = spinner_create_request(&spin_hi, ctx_hi, engine,
+ MI_ARB_CHECK);
+ if (IS_ERR(rq)) {
+ spinner_end(&spin_lo);
+ err = PTR_ERR(rq);
+ goto err_ctx_lo;
+ }
+
+ init_completion(&engine->execlists.preempt_hang.completion);
+ engine->execlists.preempt_hang.inject_hang = true;
+
+ i915_request_add(rq);
+
+ if (!wait_for_completion_timeout(&engine->execlists.preempt_hang.completion,
+ HZ / 10)) {
+ pr_err("Preemption did not occur within timeout!");
+ GEM_TRACE_DUMP();
+ i915_gem_set_wedged(i915);
+ err = -EIO;
+ goto err_ctx_lo;
+ }
+
+ set_bit(I915_RESET_ENGINE + id, &i915->gpu_error.flags);
+ i915_reset_engine(engine, NULL);
+ clear_bit(I915_RESET_ENGINE + id, &i915->gpu_error.flags);
+
+ engine->execlists.preempt_hang.inject_hang = false;
+
+ if (!wait_for_spinner(&spin_hi, rq)) {
+ GEM_TRACE("hi spinner failed to start\n");
+ GEM_TRACE_DUMP();
+ i915_gem_set_wedged(i915);
+ err = -EIO;
+ goto err_ctx_lo;
+ }
+
+ spinner_end(&spin_hi);
+ spinner_end(&spin_lo);
+ if (igt_flush_test(i915, I915_WAIT_LOCKED)) {
+ err = -EIO;
+ goto err_ctx_lo;
+ }
+ }
+
+ err = 0;
+err_ctx_lo:
+ kernel_context_close(ctx_lo);
+err_ctx_hi:
+ kernel_context_close(ctx_hi);
+err_spin_lo:
+ spinner_fini(&spin_lo);
+err_spin_hi:
+ spinner_fini(&spin_hi);
+err_unlock:
+ igt_flush_test(i915, I915_WAIT_LOCKED);
+ mutex_unlock(&i915->drm.struct_mutex);
+ return err;
+}
+
int intel_execlists_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
SUBTEST(live_sanitycheck),
SUBTEST(live_preempt),
SUBTEST(live_late_preempt),
+ SUBTEST(live_preempt_hang),
};
if (!HAS_EXECLISTS(i915))
