The heartbeat uses a single instance of a GuC submit engine (GSE) to do the hang check. As such if a different GSE's state machine hangs, the heartbeat cannot detect this hang. Add timer to each GSE which in turn can disable all submissions if it is hung.
Cc: John Harrison John.C.Harrison@Intel.com Signed-off-by: Matthew Brost matthew.brost@intel.com --- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 36 +++++++++++++++++++ .../i915/gt/uc/intel_guc_submission_types.h | 3 ++ 2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index afb9b4bb8971..2d8296bcc583 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -105,15 +105,21 @@ static bool tasklet_blocked(struct guc_submit_engine *gse) return test_bit(GSE_STATE_TASKLET_BLOCKED, &gse->flags); }
+/* 2 seconds seems like a reasonable timeout waiting for a G2H */ +#define MAX_TASKLET_BLOCKED_NS 2000000000 static void set_tasklet_blocked(struct guc_submit_engine *gse) { lockdep_assert_held(&gse->sched_engine.lock); + hrtimer_start_range_ns(&gse->hang_timer, + ns_to_ktime(MAX_TASKLET_BLOCKED_NS), 0, + HRTIMER_MODE_REL_PINNED); set_bit(GSE_STATE_TASKLET_BLOCKED, &gse->flags); }
static void __clr_tasklet_blocked(struct guc_submit_engine *gse) { lockdep_assert_held(&gse->sched_engine.lock); + hrtimer_cancel(&gse->hang_timer); clear_bit(GSE_STATE_TASKLET_BLOCKED, &gse->flags); }
@@ -1028,6 +1034,7 @@ static void disable_submission(struct intel_guc *guc) if (__tasklet_is_enabled(&sched_engine->tasklet)) { GEM_BUG_ON(!guc->ct.enabled); __tasklet_disable_sync_once(&sched_engine->tasklet); + hrtimer_try_to_cancel(&guc->gse[i]->hang_timer); sched_engine->tasklet.callback = NULL; } } @@ -3750,6 +3757,33 @@ static void guc_sched_engine_destroy(struct kref *kref) kfree(gse); }
+static enum hrtimer_restart gse_hang(struct hrtimer *hrtimer) +{ + struct guc_submit_engine *gse = + container_of(hrtimer, struct guc_submit_engine, hang_timer); + struct intel_guc *guc = gse->sched_engine.private_data; + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) + if (guc->gse_hang_expected) + drm_dbg(&guc_to_gt(guc)->i915->drm, + "GSE[%i] hung, disabling submission", gse->id); + else + drm_err(&guc_to_gt(guc)->i915->drm, + "GSE[%i] hung, disabling submission", gse->id); +#else + drm_err(&guc_to_gt(guc)->i915->drm, + "GSE[%i] hung, disabling submission", gse->id); +#endif + + /* + * Tasklet not making forward progress, disable submission which in turn + * will kick in the heartbeat to do a full GPU reset. + */ + disable_submission(guc); + + return HRTIMER_NORESTART; +} + static void guc_submit_engine_init(struct intel_guc *guc, struct guc_submit_engine *gse, int id) @@ -3767,6 +3801,8 @@ static void guc_submit_engine_init(struct intel_guc *guc, sched_engine->retire_inflight_request_prio = guc_retire_inflight_request_prio; sched_engine->private_data = guc; + hrtimer_init(&gse->hang_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + gse->hang_timer.function = gse_hang; gse->id = id; }
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission_types.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission_types.h index a5933e07bdd2..eae2e9725ede 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission_types.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission_types.h @@ -6,6 +6,8 @@ #ifndef _INTEL_GUC_SUBMISSION_TYPES_H_ #define _INTEL_GUC_SUBMISSION_TYPES_H_
+#include <linux/xarray.h> + #include "gt/intel_engine_types.h" #include "gt/intel_context_types.h" #include "i915_scheduler_types.h" @@ -41,6 +43,7 @@ struct guc_submit_engine { unsigned long flags; int total_num_rq_with_no_guc_id; atomic_t num_guc_ids_not_ready; + struct hrtimer hang_timer; int id;
/*