Re: [PATCH 23/51] drm/i915/guc: Direct all breadcrumbs for a class to single breadcrumbs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 7/16/2021 13:16, Matthew Brost wrote:
With GuC virtual engines the physical engine which a request executes
and completes on isn't known to the i915. Therefore we can't attach a
request to a physical engines breadcrumbs. To work around this we create
a single breadcrumbs per engine class when using GuC submission and
direct all physical engine interrupts to this breadcrumbs.

v2:
  (John H)
   - Rework header file structure so intel_engine_mask_t can be in
     intel_engine_types.h

Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
CC: John Harrison <John.C.Harrison@xxxxxxxxx>
Reviewed-by: John Harrison <John.C.Harrison@xxxxxxxxx>

---
  drivers/gpu/drm/i915/gt/intel_breadcrumbs.c   | 41 +++++-------
  drivers/gpu/drm/i915/gt/intel_breadcrumbs.h   | 16 ++++-
  .../gpu/drm/i915/gt/intel_breadcrumbs_types.h |  7 ++
  drivers/gpu/drm/i915/gt/intel_engine.h        |  3 +
  drivers/gpu/drm/i915/gt/intel_engine_cs.c     | 28 +++++++-
  drivers/gpu/drm/i915/gt/intel_engine_types.h  |  2 +-
  .../drm/i915/gt/intel_execlists_submission.c  |  2 +-
  drivers/gpu/drm/i915/gt/mock_engine.c         |  4 +-
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 67 +++++++++++++++++--
  9 files changed, 133 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
index 38cc42783dfb..2007dc6f6b99 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
@@ -15,28 +15,14 @@
  #include "intel_gt_pm.h"
  #include "intel_gt_requests.h"
-static bool irq_enable(struct intel_engine_cs *engine)
+static bool irq_enable(struct intel_breadcrumbs *b)
  {
-	if (!engine->irq_enable)
-		return false;
-
-	/* Caller disables interrupts */
-	spin_lock(&engine->gt->irq_lock);
-	engine->irq_enable(engine);
-	spin_unlock(&engine->gt->irq_lock);
-
-	return true;
+	return intel_engine_irq_enable(b->irq_engine);
  }
-static void irq_disable(struct intel_engine_cs *engine)
+static void irq_disable(struct intel_breadcrumbs *b)
  {
-	if (!engine->irq_disable)
-		return;
-
-	/* Caller disables interrupts */
-	spin_lock(&engine->gt->irq_lock);
-	engine->irq_disable(engine);
-	spin_unlock(&engine->gt->irq_lock);
+	intel_engine_irq_disable(b->irq_engine);
  }
static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
@@ -57,7 +43,7 @@ static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
  	WRITE_ONCE(b->irq_armed, true);
/* Requests may have completed before we could enable the interrupt. */
-	if (!b->irq_enabled++ && irq_enable(b->irq_engine))
+	if (!b->irq_enabled++ && b->irq_enable(b))
  		irq_work_queue(&b->irq_work);
  }
@@ -76,7 +62,7 @@ static void __intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b)
  {
  	GEM_BUG_ON(!b->irq_enabled);
  	if (!--b->irq_enabled)
-		irq_disable(b->irq_engine);
+		b->irq_disable(b);
WRITE_ONCE(b->irq_armed, false);
  	intel_gt_pm_put_async(b->irq_engine->gt);
@@ -281,7 +267,7 @@ intel_breadcrumbs_create(struct intel_engine_cs *irq_engine)
  	if (!b)
  		return NULL;
- b->irq_engine = irq_engine;
+	kref_init(&b->ref);
spin_lock_init(&b->signalers_lock);
  	INIT_LIST_HEAD(&b->signalers);
@@ -290,6 +276,10 @@ intel_breadcrumbs_create(struct intel_engine_cs *irq_engine)
  	spin_lock_init(&b->irq_lock);
  	init_irq_work(&b->irq_work, signal_irq_work);
+ b->irq_engine = irq_engine;
+	b->irq_enable = irq_enable;
+	b->irq_disable = irq_disable;
+
  	return b;
  }
@@ -303,9 +293,9 @@ void intel_breadcrumbs_reset(struct intel_breadcrumbs *b)
  	spin_lock_irqsave(&b->irq_lock, flags);
if (b->irq_enabled)
-		irq_enable(b->irq_engine);
+		b->irq_enable(b);
  	else
-		irq_disable(b->irq_engine);
+		b->irq_disable(b);
spin_unlock_irqrestore(&b->irq_lock, flags);
  }
@@ -325,11 +315,14 @@ void __intel_breadcrumbs_park(struct intel_breadcrumbs *b)
  	}
  }
-void intel_breadcrumbs_free(struct intel_breadcrumbs *b)
+void intel_breadcrumbs_free(struct kref *kref)
  {
+	struct intel_breadcrumbs *b = container_of(kref, typeof(*b), ref);
+
  	irq_work_sync(&b->irq_work);
  	GEM_BUG_ON(!list_empty(&b->signalers));
  	GEM_BUG_ON(b->irq_armed);
+
  	kfree(b);
  }
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h
index 3ce5ce270b04..be0d4f379a85 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h
@@ -9,7 +9,7 @@
  #include <linux/atomic.h>
  #include <linux/irq_work.h>
-#include "intel_engine_types.h"
+#include "intel_breadcrumbs_types.h"
struct drm_printer;
  struct i915_request;
@@ -17,7 +17,7 @@ struct intel_breadcrumbs;
struct intel_breadcrumbs *
  intel_breadcrumbs_create(struct intel_engine_cs *irq_engine);
-void intel_breadcrumbs_free(struct intel_breadcrumbs *b);
+void intel_breadcrumbs_free(struct kref *kref);
void intel_breadcrumbs_reset(struct intel_breadcrumbs *b);
  void __intel_breadcrumbs_park(struct intel_breadcrumbs *b);
@@ -48,4 +48,16 @@ void i915_request_cancel_breadcrumb(struct i915_request *request);
  void intel_context_remove_breadcrumbs(struct intel_context *ce,
  				      struct intel_breadcrumbs *b);
+static inline struct intel_breadcrumbs *
+intel_breadcrumbs_get(struct intel_breadcrumbs *b)
+{
+	kref_get(&b->ref);
+	return b;
+}
+
+static inline void intel_breadcrumbs_put(struct intel_breadcrumbs *b)
+{
+	kref_put(&b->ref, intel_breadcrumbs_free);
+}
+
  #endif /* __INTEL_BREADCRUMBS__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h b/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h
index 3a084ce8ff5e..72dfd3748c4c 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h
@@ -7,10 +7,13 @@
  #define __INTEL_BREADCRUMBS_TYPES__
#include <linux/irq_work.h>
+#include <linux/kref.h>
  #include <linux/list.h>
  #include <linux/spinlock.h>
  #include <linux/types.h>
+#include "intel_engine_types.h"
+
  /*
   * Rather than have every client wait upon all user interrupts,
   * with the herd waking after every interrupt and each doing the
@@ -29,6 +32,7 @@
   * the overhead of waking that client is much preferred.
   */
  struct intel_breadcrumbs {
+	struct kref ref;
  	atomic_t active;
spinlock_t signalers_lock; /* protects the list of signalers */
@@ -42,7 +46,10 @@ struct intel_breadcrumbs {
  	bool irq_armed;
/* Not all breadcrumbs are attached to physical HW */
+	intel_engine_mask_t	engine_mask;
  	struct intel_engine_cs *irq_engine;
+	bool	(*irq_enable)(struct intel_breadcrumbs *b);
+	void	(*irq_disable)(struct intel_breadcrumbs *b);
  };
#endif /* __INTEL_BREADCRUMBS_TYPES__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 9fec0aca5f4b..edbde6171bca 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -212,6 +212,9 @@ void intel_engine_get_instdone(const struct intel_engine_cs *engine,
void intel_engine_init_execlists(struct intel_engine_cs *engine); +bool intel_engine_irq_enable(struct intel_engine_cs *engine);
+void intel_engine_irq_disable(struct intel_engine_cs *engine);
+
  static inline void __intel_engine_reset(struct intel_engine_cs *engine,
  					bool stalled)
  {
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index b7292d5cb7da..d95d666407f5 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -739,7 +739,7 @@ static int engine_setup_common(struct intel_engine_cs *engine)
  err_cmd_parser:
  	i915_sched_engine_put(engine->sched_engine);
  err_sched_engine:
-	intel_breadcrumbs_free(engine->breadcrumbs);
+	intel_breadcrumbs_put(engine->breadcrumbs);
  err_status:
  	cleanup_status_page(engine);
  	return err;
@@ -948,7 +948,7 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine)
  	GEM_BUG_ON(!list_empty(&engine->sched_engine->requests));
i915_sched_engine_put(engine->sched_engine);
-	intel_breadcrumbs_free(engine->breadcrumbs);
+	intel_breadcrumbs_put(engine->breadcrumbs);
intel_engine_fini_retire(engine);
  	intel_engine_cleanup_cmd_parser(engine);
@@ -1265,6 +1265,30 @@ bool intel_engines_are_idle(struct intel_gt *gt)
  	return true;
  }
+bool intel_engine_irq_enable(struct intel_engine_cs *engine)
+{
+	if (!engine->irq_enable)
+		return false;
+
+	/* Caller disables interrupts */
+	spin_lock(&engine->gt->irq_lock);
+	engine->irq_enable(engine);
+	spin_unlock(&engine->gt->irq_lock);
+
+	return true;
+}
+
+void intel_engine_irq_disable(struct intel_engine_cs *engine)
+{
+	if (!engine->irq_disable)
+		return;
+
+	/* Caller disables interrupts */
+	spin_lock(&engine->gt->irq_lock);
+	engine->irq_disable(engine);
+	spin_unlock(&engine->gt->irq_lock);
+}
+
  void intel_engines_reset_default_submission(struct intel_gt *gt)
  {
  	struct intel_engine_cs *engine;
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 8ad304b2f2e4..03a81e8d87f4 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -21,7 +21,6 @@
  #include "i915_pmu.h"
  #include "i915_priolist_types.h"
  #include "i915_selftest.h"
-#include "intel_breadcrumbs_types.h"
  #include "intel_sseu.h"
  #include "intel_timeline_types.h"
  #include "intel_uncore.h"
@@ -63,6 +62,7 @@ struct i915_sched_engine;
  struct intel_gt;
  struct intel_ring;
  struct intel_uncore;
+struct intel_breadcrumbs;
typedef u8 intel_engine_mask_t;
  #define ALL_ENGINES ((intel_engine_mask_t)~0ul)
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 920707e22eb0..abe48421fd7a 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -3407,7 +3407,7 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
  	intel_context_fini(&ve->context);
if (ve->base.breadcrumbs)
-		intel_breadcrumbs_free(ve->base.breadcrumbs);
+		intel_breadcrumbs_put(ve->base.breadcrumbs);
  	if (ve->base.sched_engine)
  		i915_sched_engine_put(ve->base.sched_engine);
  	intel_engine_free_request_pool(&ve->base);
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
index 9203c766db80..fc5a65ab1937 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -284,7 +284,7 @@ static void mock_engine_release(struct intel_engine_cs *engine)
  	GEM_BUG_ON(timer_pending(&mock->hw_delay));
i915_sched_engine_put(engine->sched_engine);
-	intel_breadcrumbs_free(engine->breadcrumbs);
+	intel_breadcrumbs_put(engine->breadcrumbs);
intel_context_unpin(engine->kernel_context);
  	intel_context_put(engine->kernel_context);
@@ -376,7 +376,7 @@ int mock_engine_init(struct intel_engine_cs *engine)
  	return 0;
err_breadcrumbs:
-	intel_breadcrumbs_free(engine->breadcrumbs);
+	intel_breadcrumbs_put(engine->breadcrumbs);
  err_schedule:
  	i915_sched_engine_put(engine->sched_engine);
  	return -ENOMEM;
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 372e0dc7617a..9f28899ff17f 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1076,6 +1076,9 @@ static void __guc_context_destroy(struct intel_context *ce)
  		struct guc_virtual_engine *ve =
  			container_of(ce, typeof(*ve), context);
+ if (ve->base.breadcrumbs)
+			intel_breadcrumbs_put(ve->base.breadcrumbs);
+
  		kfree(ve);
  	} else {
  		intel_context_free(ce);
@@ -1366,6 +1369,62 @@ static const struct intel_context_ops virtual_guc_context_ops = {
  	.get_sibling = guc_virtual_get_sibling,
  };
+static bool
+guc_irq_enable_breadcrumbs(struct intel_breadcrumbs *b)
+{
+	struct intel_engine_cs *sibling;
+	intel_engine_mask_t tmp, mask = b->engine_mask;
+	bool result = false;
+
+	for_each_engine_masked(sibling, b->irq_engine->gt, mask, tmp)
+		result |= intel_engine_irq_enable(sibling);
+
+	return result;
+}
+
+static void
+guc_irq_disable_breadcrumbs(struct intel_breadcrumbs *b)
+{
+	struct intel_engine_cs *sibling;
+	intel_engine_mask_t tmp, mask = b->engine_mask;
+
+	for_each_engine_masked(sibling, b->irq_engine->gt, mask, tmp)
+		intel_engine_irq_disable(sibling);
+}
+
+static void guc_init_breadcrumbs(struct intel_engine_cs *engine)
+{
+	int i;
+
+       /*
+        * In GuC submission mode we do not know which physical engine a request
+        * will be scheduled on, this creates a problem because the breadcrumb
+        * interrupt is per physical engine. To work around this we attach
+        * requests and direct all breadcrumb interrupts to the first instance
+        * of an engine per class. In addition all breadcrumb interrupts are
+	* enabled / disabled across an engine class in unison.
+        */
+	for (i = 0; i < MAX_ENGINE_INSTANCE; ++i) {
+		struct intel_engine_cs *sibling =
+			engine->gt->engine_class[engine->class][i];
+
+		if (sibling) {
+			if (engine->breadcrumbs != sibling->breadcrumbs) {
+				intel_breadcrumbs_put(engine->breadcrumbs);
+				engine->breadcrumbs =
+					intel_breadcrumbs_get(sibling->breadcrumbs);
+			}
+			break;
+		}
+	}
+
+	if (engine->breadcrumbs) {
+		engine->breadcrumbs->engine_mask |= engine->mask;
+		engine->breadcrumbs->irq_enable = guc_irq_enable_breadcrumbs;
+		engine->breadcrumbs->irq_disable = guc_irq_disable_breadcrumbs;
+	}
+}
+
  static void sanitize_hwsp(struct intel_engine_cs *engine)
  {
  	struct intel_timeline *tl;
@@ -1589,6 +1648,7 @@ int intel_guc_submission_setup(struct intel_engine_cs *engine)
guc_default_vfuncs(engine);
  	guc_default_irqs(engine);
+	guc_init_breadcrumbs(engine);
if (engine->class == RENDER_CLASS)
  		rcs_submission_override(engine);
@@ -1831,11 +1891,6 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
  	ve->base.instance = I915_ENGINE_CLASS_INVALID_VIRTUAL;
  	ve->base.uabi_instance = I915_ENGINE_CLASS_INVALID_VIRTUAL;
  	ve->base.saturated = ALL_ENGINES;
-	ve->base.breadcrumbs = intel_breadcrumbs_create(&ve->base);
-	if (!ve->base.breadcrumbs) {
-		kfree(ve);
-		return ERR_PTR(-ENOMEM);
-	}
snprintf(ve->base.name, sizeof(ve->base.name), "virtual"); @@ -1884,6 +1939,8 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
  				sibling->emit_fini_breadcrumb;
  			ve->base.emit_fini_breadcrumb_dw =
  				sibling->emit_fini_breadcrumb_dw;
+			ve->base.breadcrumbs =
+				intel_breadcrumbs_get(sibling->breadcrumbs);
ve->base.flags |= sibling->flags;




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux