In preparation to more carefully handling incomplete preemption during
reset by execlists, we move the existing code wholesale to the backends
under a couple of new reset vfuncs.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michał Winiarski <michal.winiarski@xxxxxxxxx>
CC: Michel Thierry <michel.thierry@xxxxxxxxx>
Cc: Jeff McGee <jeff.mcgee@xxxxxxxxx>
Reviewed-by: Jeff McGee <jeff.mcgee@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 38 +++----------------
drivers/gpu/drm/i915/i915_gem.h | 5 +++
drivers/gpu/drm/i915/intel_lrc.c | 50 +++++++++++++++++++++++--
drivers/gpu/drm/i915/intel_ringbuffer.c | 23 ++++++++++--
drivers/gpu/drm/i915/intel_ringbuffer.h | 9 ++++-
5 files changed, 84 insertions(+), 41 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index aab1f5e77ae9..abf661d40641 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3004,7 +3004,7 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
struct i915_request *
i915_gem_reset_prepare_engine(struct intel_engine_cs *engine)
{
- struct i915_request *request = NULL;
+ struct i915_request *request;
/*
* During the reset sequence, we must prevent the engine from
@@ -3027,31 +3027,7 @@ i915_gem_reset_prepare_engine(struct intel_engine_cs *engine)
*/
kthread_park(engine->breadcrumbs.signaler);
- /*
- * Prevent request submission to the hardware until we have
- * completed the reset in i915_gem_reset_finish(). If a request
- * is completed by one engine, it may then queue a request
- * to a second via its execlists->tasklet *just* as we are
- * calling engine->init_hw() and also writing the ELSP.
- * Turning off the execlists->tasklet until the reset is over
- * prevents the race.
- */
- __tasklet_disable_once(&engine->execlists.tasklet);
-
- /*
- * We're using worker to queue preemption requests from the tasklet in
- * GuC submission mode.
- * Even though tasklet was disabled, we may still have a worker queued.
- * Let's make sure that all workers scheduled before disabling the
- * tasklet are completed before continuing with the reset.
- */
- if (engine->i915->guc.preempt_wq)
- flush_workqueue(engine->i915->guc.preempt_wq);
-
- if (engine->irq_seqno_barrier)
- engine->irq_seqno_barrier(engine);
-
- request = i915_gem_find_active_request(engine);
+ request = engine->reset.prepare(engine);
if (request && request->fence.error == -EIO)
request = ERR_PTR(-EIO); /* Previous reset failed! */
@@ -3202,13 +3178,8 @@ void i915_gem_reset_engine(struct intel_engine_cs *engine,
if (request)
request = i915_gem_reset_request(engine, request, stalled);
- if (request) {
- DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
- engine->name, request->global_seqno);
- }
-
/* Setup the CS to resume from the breadcrumb of the hung request */
- engine->reset_hw(engine, request);
+ engine->reset.reset(engine, request);
}
void i915_gem_reset(struct drm_i915_private *dev_priv,
@@ -3256,7 +3227,8 @@ void i915_gem_reset(struct drm_i915_private *dev_priv,
void i915_gem_reset_finish_engine(struct intel_engine_cs *engine)
{
- tasklet_enable(&engine->execlists.tasklet);
+ engine->reset.finish(engine);
+
kthread_unpark(engine->breadcrumbs.signaler);
intel_uncore_forcewake_put(engine->i915, FORCEWAKE_ALL);
diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h
index af033e7c1c56..3bdebee41791 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -79,4 +79,9 @@ static inline void __tasklet_disable_once(struct tasklet_struct *t)
tasklet_unlock_wait(t);
}
+static inline bool __tasklet_is_enabled(struct tasklet_struct *t)
+{
+ return !atomic_read(&t->count);
+}
+
#endif /* __I915_GEM_H__ */
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index b2781f1bb91c..1548563e2b43 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1826,8 +1826,39 @@ static int gen9_init_render_ring(struct intel_engine_cs *engine)
return 0;
}
-static void reset_common_ring(struct intel_engine_cs *engine,
- struct i915_request *request)
+static struct i915_request *
+execlists_reset_prepare(struct intel_engine_cs *engine)
+{
+ struct intel_engine_execlists * const execlists = &engine->execlists;
+
+ GEM_TRACE("%s\n", engine->name);
+
+ /*
+ * Prevent request submission to the hardware until we have
+ * completed the reset in i915_gem_reset_finish(). If a request
+ * is completed by one engine, it may then queue a request
+ * to a second via its execlists->tasklet *just* as we are
+ * calling engine->init_hw() and also writing the ELSP.
+ * Turning off the execlists->tasklet until the reset is over
+ * prevents the race.
+ */
+ __tasklet_disable_once(&execlists->tasklet);
+
+ /*
+ * We're using worker to queue preemption requests from the tasklet in
+ * GuC submission mode.
+ * Even though tasklet was disabled, we may still have a worker queued.
+ * Let's make sure that all workers scheduled before disabling the
+ * tasklet are completed before continuing with the reset.
+ */
+ if (engine->i915->guc.preempt_wq)
+ flush_workqueue(engine->i915->guc.preempt_wq);
+
+ return i915_gem_find_active_request(engine);
+}
+
+static void execlists_reset(struct intel_engine_cs *engine,
+ struct i915_request *request)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
unsigned long flags;
@@ -1837,6 +1868,9 @@ static void reset_common_ring(struct intel_engine_cs *engine,
engine->name, request ? request->global_seqno : 0,
intel_engine_get_seqno(engine));
+ /* The submission tasklet must be disabled, engine->reset.prepare(). */
+ GEM_BUG_ON(__tasklet_is_enabled(&execlists->tasklet));
+
/* See execlists_cancel_requests() for the irq/spinlock split. */
local_irq_save(flags);
@@ -1907,6 +1941,13 @@ static void reset_common_ring(struct intel_engine_cs *engine,
unwind_wa_tail(request);
}
+static void execlists_reset_finish(struct intel_engine_cs *engine)
+{
+ tasklet_enable(&engine->execlists.tasklet);
+
+ GEM_TRACE("%s\n", engine->name);
+}
+
static int intel_logical_ring_emit_pdps(struct i915_request *rq)
{
struct i915_hw_ppgtt *ppgtt = rq->ctx->ppgtt;
@@ -2236,7 +2277,10 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
{
/* Default vfuncs which can be overriden by each engine. */
engine->init_hw = gen8_init_common_ring;
- engine->reset_hw = reset_common_ring;
+
+ engine->reset.prepare = execlists_reset_prepare;
+ engine->reset.reset = execlists_reset;
+ engine->reset.finish = execlists_reset_finish;
engine->context_pin = execlists_context_pin;
engine->context_unpin = execlists_context_unpin;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8f19349a6055..af5a178366ed 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -531,9 +531,20 @@ static int init_ring_common(struct intel_engine_cs *engine)
return ret;
}
-static void reset_ring_common(struct intel_engine_cs *engine,
- struct i915_request *request)
+static struct i915_request *reset_prepare(struct intel_engine_cs *engine)
{
+ if (engine->irq_seqno_barrier)
+ engine->irq_seqno_barrier(engine);
+
+ return i915_gem_find_active_request(engine);
+}
+
+static void reset_ring(struct intel_engine_cs *engine,
+ struct i915_request *request)
+{
+ GEM_TRACE("%s seqno=%x\n",
+ engine->name, request ? request->global_seqno : 0);
+
/*
* RC6 must be prevented until the reset is complete and the engine
* reinitialised. If it occurs in the middle of this sequence, the
@@ -597,6 +608,10 @@ static void reset_ring_common(struct intel_engine_cs *engine,
}
}
+static void reset_finish(struct intel_engine_cs *engine)
+{
+}
+
static int intel_rcs_ctx_init(struct i915_request *rq)
{
int ret;
@@ -2006,7 +2021,9 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
intel_ring_init_semaphores(dev_priv, engine);
engine->init_hw = init_ring_common;
- engine->reset_hw = reset_ring_common;
+ engine->reset.prepare = reset_prepare;
+ engine->reset.reset = reset_ring;
+ engine->reset.finish = reset_finish;
engine->context_pin = intel_ring_context_pin;
engine->context_unpin = intel_ring_context_unpin;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 010750e8ee44..1e8bacba7754 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -423,8 +423,13 @@ struct intel_engine_cs {
void (*irq_disable)(struct intel_engine_cs *engine);
int (*init_hw)(struct intel_engine_cs *engine);
- void (*reset_hw)(struct intel_engine_cs *engine,
- struct i915_request *rq);
+
+ struct {
+ struct i915_request *(*prepare)(struct intel_engine_cs *engine);
+ void (*reset)(struct intel_engine_cs *engine,
+ struct i915_request *rq);
+ void (*finish)(struct intel_engine_cs *engine);
+ } reset;
void (*park)(struct intel_engine_cs *engine);
void (*unpark)(struct intel_engine_cs *engine);
--
2.17.0
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