[Intel-gfx] [PATCH] drm/i915/execlists: Flush the tasklet on parking
Chris Wilson
chris at chris-wilson.co.uk
Fri May 3 08:09:42 UTC 2019
Tidy up the cleanup sequence by always ensure that the tasklet is
flushed on parking (before we cleanup). The parking provides a
convenient point to ensure that the backend is truly idle.
v2: Do the full check for idleness before parking, to be sure we flush
any residual interrupt.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 2 ++
drivers/gpu/drm/i915/gt/intel_engine_pm.c | 27 +++++++++++++++++----
drivers/gpu/drm/i915/gt/intel_engine_pm.h | 2 ++
drivers/gpu/drm/i915/gt/intel_lrc.c | 16 ++++++------
drivers/gpu/drm/i915/intel_guc_submission.c | 2 ++
5 files changed, 35 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 650bc325a901..416d7e2e6f8c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1097,6 +1097,8 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
if (READ_ONCE(engine->execlists.active)) {
struct tasklet_struct *t = &engine->execlists.tasklet;
+ synchronize_hardirq(engine->i915->drm.irq);
+
local_bh_disable();
if (tasklet_trylock(t)) {
/* Must wait for any GPU reset in progress. */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
index 3976aea3c1d1..ccf034764741 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
@@ -10,7 +10,7 @@
#include "intel_engine_pm.h"
#include "intel_gt_pm.h"
-static int intel_engine_unpark(struct intel_wakeref *wf)
+static int __engine_unpark(struct intel_wakeref *wf)
{
struct intel_engine_cs *engine =
container_of(wf, typeof(*engine), wakeref);
@@ -37,7 +37,24 @@ static int intel_engine_unpark(struct intel_wakeref *wf)
void intel_engine_pm_get(struct intel_engine_cs *engine)
{
- intel_wakeref_get(engine->i915, &engine->wakeref, intel_engine_unpark);
+ intel_wakeref_get(engine->i915, &engine->wakeref, __engine_unpark);
+}
+
+void intel_engine_park(struct intel_engine_cs *engine)
+{
+ /*
+ * We are committed now to parking this engine, make sure there
+ * will be no more interrupts arriving later and the engine
+ * is truly idle.
+ */
+ if (wait_for(intel_engine_is_idle(engine), 10)) {
+ struct drm_printer p = drm_debug_printer(__func__);
+
+ dev_err(engine->i915->drm.dev,
+ "%s is not idle before parking\n",
+ engine->name);
+ intel_engine_dump(engine, &p, NULL);
+ }
}
static bool switch_to_kernel_context(struct intel_engine_cs *engine)
@@ -56,7 +73,7 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine)
* Note, we do this without taking the timeline->mutex. We cannot
* as we may be called while retiring the kernel context and so
* already underneath the timeline->mutex. Instead we rely on the
- * exclusive property of the intel_engine_park that prevents anyone
+ * exclusive property of the __engine_park that prevents anyone
* else from creating a request on this engine. This also requires
* that the ring is empty and we avoid any waits while constructing
* the context, as they assume protection by the timeline->mutex.
@@ -76,7 +93,7 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine)
return false;
}
-static int intel_engine_park(struct intel_wakeref *wf)
+static int __engine_park(struct intel_wakeref *wf)
{
struct intel_engine_cs *engine =
container_of(wf, typeof(*engine), wakeref);
@@ -114,7 +131,7 @@ static int intel_engine_park(struct intel_wakeref *wf)
void intel_engine_pm_put(struct intel_engine_cs *engine)
{
- intel_wakeref_put(engine->i915, &engine->wakeref, intel_engine_park);
+ intel_wakeref_put(engine->i915, &engine->wakeref, __engine_park);
}
void intel_engine_init__pm(struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.h b/drivers/gpu/drm/i915/gt/intel_engine_pm.h
index 143ac90ba117..b326cd993d60 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_pm.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.h
@@ -13,6 +13,8 @@ struct intel_engine_cs;
void intel_engine_pm_get(struct intel_engine_cs *engine);
void intel_engine_pm_put(struct intel_engine_cs *engine);
+void intel_engine_park(struct intel_engine_cs *engine);
+
void intel_engine_init__pm(struct intel_engine_cs *engine);
int intel_engines_resume(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 8c2eeff79f03..5580b6f1aa0c 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -136,6 +136,7 @@
#include "i915_drv.h"
#include "i915_gem_render_state.h"
#include "i915_vgpu.h"
+#include "intel_engine_pm.h"
#include "intel_lrc_reg.h"
#include "intel_mocs.h"
#include "intel_reset.h"
@@ -2331,6 +2332,11 @@ static int gen8_init_rcs_context(struct i915_request *rq)
return i915_gem_render_state_emit(rq);
}
+static void execlists_park(struct intel_engine_cs *engine)
+{
+ intel_engine_park(engine);
+}
+
void intel_execlists_set_default_submission(struct intel_engine_cs *engine)
{
engine->submit_request = execlists_submit_request;
@@ -2342,7 +2348,7 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine)
engine->reset.reset = execlists_reset;
engine->reset.finish = execlists_reset_finish;
- engine->park = NULL;
+ engine->park = execlists_park;
engine->unpark = NULL;
engine->flags |= I915_ENGINE_SUPPORTS_STATS;
@@ -2355,14 +2361,6 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine)
static void execlists_destroy(struct intel_engine_cs *engine)
{
- /*
- * Tasklet cannot be active at this point due intel_mark_active/idle
- * so this is just for documentation.
- */
- if (GEM_DEBUG_WARN_ON(test_bit(TASKLET_STATE_SCHED,
- &engine->execlists.tasklet.state)))
- tasklet_kill(&engine->execlists.tasklet);
-
intel_engine_cleanup_common(engine);
lrc_destroy_wa_ctx(engine);
kfree(engine);
diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 4c814344809c..57ed1dd4ae41 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -25,6 +25,7 @@
#include <linux/circ_buf.h>
#include <trace/events/dma_fence.h>
+#include "gt/intel_engine_pm.h"
#include "gt/intel_lrc_reg.h"
#include "intel_guc_submission.h"
@@ -1363,6 +1364,7 @@ static void guc_interrupts_release(struct drm_i915_private *dev_priv)
static void guc_submission_park(struct intel_engine_cs *engine)
{
+ intel_engine_park(engine);
intel_engine_unpin_breadcrumbs_irq(engine);
engine->flags &= ~I915_ENGINE_NEEDS_BREADCRUMB_TASKLET;
}
--
2.20.1
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