[Intel-gfx] [PATCH 1/3] drm/i915: Add a hook for making the engines idle (parking) and unparking
Chris Wilson
chris at chris-wilson.co.uk
Fri Oct 20 21:06:38 UTC 2017
In the next patch, we will want to install a callback when the engines
(GT as a whole) become idle and similarly when they first become busy.
To enable that callback, first rename intel_engines_mark_idle() to the
intel_engines_park() and provide the companion intel_engines_unpark().
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/i915_gem_request.c | 2 ++
drivers/gpu/drm/i915/intel_engine_cs.c | 33 +++++++++++++++++++++++++++++++--
drivers/gpu/drm/i915/intel_lrc.c | 3 +++
drivers/gpu/drm/i915/intel_ringbuffer.c | 5 ++++-
drivers/gpu/drm/i915/intel_ringbuffer.h | 6 +++++-
6 files changed, 46 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 026cb52ece0b..bf350861acf7 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3319,7 +3319,7 @@ i915_gem_idle_work_handler(struct work_struct *work)
if (wait_for(intel_engines_are_idle(dev_priv), 10))
DRM_ERROR("Timeout waiting for engines to idle\n");
- intel_engines_mark_idle(dev_priv);
+ intel_engines_park(dev_priv);
i915_gem_timelines_mark_idle(dev_priv);
GEM_BUG_ON(!dev_priv->gt.awake);
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index d140fcf5c6a3..e0d6221022a8 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -259,6 +259,8 @@ static void mark_busy(struct drm_i915_private *i915)
if (INTEL_GEN(i915) >= 6)
gen6_rps_busy(i915);
+ intel_engines_unpark(i915);
+
queue_delayed_work(i915->wq,
&i915->gt.retire_work,
round_jiffies_up_relative(HZ));
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index a47a9c6bea52..0213edc237fe 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1594,19 +1594,48 @@ void intel_engines_reset_default_submission(struct drm_i915_private *i915)
engine->set_default_submission(engine);
}
-void intel_engines_mark_idle(struct drm_i915_private *i915)
+/**
+ * intel_engines_park: called when the GT is transitioning from busy->idle
+ * @i915: the i915 device
+ *
+ * The GT is now idle and about to go to sleep (maybe never to wake again?).
+ * Time for us to tidy and put away our toys (release resources back to the
+ * system).
+ */
+void intel_engines_park(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
for_each_engine(engine, i915, id) {
+ if (engine->park)
+ engine->park(engine);
+
intel_engine_disarm_breadcrumbs(engine);
- i915_gem_batch_pool_fini(&engine->batch_pool);
tasklet_kill(&engine->execlists.irq_tasklet);
+
+ i915_gem_batch_pool_fini(&engine->batch_pool);
engine->execlists.no_priolist = false;
}
}
+/**
+ * intel_engines_unpark: called when the GT is transitioning from idle->busy
+ * @i915: the i915 device
+ *
+ * The GT was idle and now about to fire up with some new user requests.
+ */
+void intel_engines_unpark(struct drm_i915_private *i915)
+{
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ for_each_engine(engine, i915, id) {
+ if (engine->unpark)
+ engine->unpark(engine);
+ }
+}
+
bool intel_engine_can_store_dword(struct intel_engine_cs *engine)
{
switch (INTEL_GEN(engine->i915)) {
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 7f45dd7dc3e5..a030ca44a7ae 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1880,6 +1880,9 @@ static void execlists_set_default_submission(struct intel_engine_cs *engine)
engine->cancel_requests = execlists_cancel_requests;
engine->schedule = execlists_schedule;
engine->execlists.irq_tasklet.func = intel_lrc_irq_handler;
+
+ engine->park = NULL;
+ engine->unpark = NULL;
}
static void
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8da1bde442dd..05e01446b00b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2028,12 +2028,15 @@ static void i9xx_set_default_submission(struct intel_engine_cs *engine)
{
engine->submit_request = i9xx_submit_request;
engine->cancel_requests = cancel_requests;
+
+ engine->park = NULL;
+ engine->unpark = NULL;
}
static void gen6_bsd_set_default_submission(struct intel_engine_cs *engine)
{
+ i9xx_set_default_submission(engine);
engine->submit_request = gen6_bsd_submit_request;
- engine->cancel_requests = cancel_requests;
}
static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 17186f067408..240814b60a65 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -357,6 +357,9 @@ struct intel_engine_cs {
void (*reset_hw)(struct intel_engine_cs *engine,
struct drm_i915_gem_request *req);
+ void (*park)(struct intel_engine_cs *engine);
+ void (*unpark)(struct intel_engine_cs *engine);
+
void (*set_default_submission)(struct intel_engine_cs *engine);
struct intel_ring *(*context_pin)(struct intel_engine_cs *engine,
@@ -836,7 +839,8 @@ static inline u32 *gen8_emit_pipe_control(u32 *batch, u32 flags, u32 offset)
bool intel_engine_is_idle(struct intel_engine_cs *engine);
bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
-void intel_engines_mark_idle(struct drm_i915_private *i915);
+void intel_engines_park(struct drm_i915_private *i915);
+void intel_engines_unpark(struct drm_i915_private *i915);
void intel_engines_reset_default_submission(struct drm_i915_private *i915);
bool intel_engine_can_store_dword(struct intel_engine_cs *engine);
--
2.15.0.rc1
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