[PATCH 11/27] drm/i915: Push the ring creation flags to the backend

Chris Wilson chris at chris-wilson.co.uk
Wed Aug 7 07:18:15 UTC 2019


Push the ring creation flags from the outer GEM context to the inner
intel_context to avoid an unsightly back-reference from inside the
backend.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Andi Shyti <andi.shyti at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c   | 52 ++++++++++++++-----
 .../gpu/drm/i915/gem/i915_gem_context_types.h |  3 --
 drivers/gpu/drm/i915/gt/intel_context.c       |  1 +
 drivers/gpu/drm/i915/gt/intel_context.h       |  5 ++
 drivers/gpu/drm/i915/gt/intel_engine_cs.c     |  2 +
 drivers/gpu/drm/i915/gt/intel_lrc.c           |  5 +-
 drivers/gpu/drm/i915/gt/intel_ringbuffer.c    |  2 +-
 drivers/gpu/drm/i915/gt/mock_engine.c         |  2 +-
 drivers/gpu/drm/i915/i915_debugfs.c           | 23 +++++---
 9 files changed, 65 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index af2ebb5bdcad..557e7d5ab72f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -510,8 +510,6 @@ __create_context(struct drm_i915_private *i915)
 	if (i915_modparams.enable_hangcheck) /* cgroup hook? */
 		i915_gem_context_set_persistence(ctx);
 
-	ctx->ring_size = 4 * PAGE_SIZE;
-
 	for (i = 0; i < ARRAY_SIZE(ctx->hang_timestamp); i++)
 		ctx->hang_timestamp[i] = jiffies - CONTEXT_FAST_HANG_JIFFIES;
 
@@ -522,22 +520,34 @@ __create_context(struct drm_i915_private *i915)
 	return ERR_PTR(err);
 }
 
+static void
+context_apply_all(struct i915_gem_context *ctx,
+		  void (*fn)(struct intel_context *ce, void *data),
+		  void *data)
+{
+	struct i915_gem_engines_iter it;
+	struct intel_context *ce;
+
+	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it)
+		fn(ce, data);
+	i915_gem_context_unlock_engines(ctx);
+}
+
+static void __apply_ppgtt(struct intel_context *ce, void *vm)
+{
+	i915_vm_put(ce->vm);
+	ce->vm = i915_vm_get(vm);
+}
+
 static struct i915_address_space *
 __set_ppgtt(struct i915_gem_context *ctx, struct i915_address_space *vm)
 {
 	struct i915_address_space *old = ctx->vm;
-	struct i915_gem_engines_iter it;
-	struct intel_context *ce;
 
 	GEM_BUG_ON(old && i915_vm_is_4lvl(vm) != i915_vm_is_4lvl(old));
 
 	ctx->vm = i915_vm_get(vm);
-
-	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
-		i915_vm_put(ce->vm);
-		ce->vm = i915_vm_get(vm);
-	}
-	i915_gem_context_unlock_engines(ctx);
+	context_apply_all(ctx, __apply_ppgtt, vm);
 
 	return old;
 }
@@ -603,6 +613,11 @@ i915_gem_create_context(struct drm_i915_private *dev_priv, unsigned int flags)
 	return ctx;
 }
 
+static void __apply_ring_size(struct intel_context *ce, void *data)
+{
+	ce->ring = data;
+}
+
 /**
  * i915_gem_context_create_gvt - create a GVT GEM context
  * @dev: drm device *
@@ -617,6 +632,7 @@ struct i915_gem_context *
 i915_gem_context_create_gvt(struct drm_device *dev)
 {
 	struct i915_gem_context *ctx;
+	unsigned long ring_size;
 	int ret;
 
 	if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
@@ -641,8 +657,14 @@ i915_gem_context_create_gvt(struct drm_device *dev)
 	i915_gem_context_set_closed(ctx); /* not user accessible */
 	i915_gem_context_clear_bannable(ctx);
 	i915_gem_context_set_force_single_submission(ctx);
+
+	ring_size = SZ_4K;
 	if (!USES_GUC_SUBMISSION(to_i915(dev)))
-		ctx->ring_size = 512 * PAGE_SIZE; /* Max ring buffer size */
+		ring_size = 512 * SZ_4K; /* max */
+
+	context_apply_all(ctx,
+			  __apply_ring_size,
+			  __intel_context_ring_size(ring_size));
 
 	GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
 out:
@@ -681,7 +703,6 @@ i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio)
 
 	i915_gem_context_clear_bannable(ctx);
 	ctx->sched.priority = I915_USER_PRIORITY(prio);
-	ctx->ring_size = PAGE_SIZE;
 
 	GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
 
@@ -1665,6 +1686,7 @@ set_engines(struct i915_gem_context *ctx,
 	for (n = 0; n < num_engines; n++) {
 		struct i915_engine_class_instance ci;
 		struct intel_engine_cs *engine;
+		struct intel_context *ce;
 
 		if (copy_from_user(&ci, &user->engines[n], sizeof(ci))) {
 			__free_engines(set.engines, n);
@@ -1687,11 +1709,13 @@ set_engines(struct i915_gem_context *ctx,
 			return -ENOENT;
 		}
 
-		set.engines->engines[n] = intel_context_create(ctx, engine);
-		if (!set.engines->engines[n]) {
+		ce = intel_context_create(ctx, engine);
+		if (!ce) {
 			__free_engines(set.engines, n);
 			return -ENOMEM;
 		}
+
+		set.engines->engines[n] = ce;
 	}
 	set.engines->num_engines = num_engines;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index bf41b43ffa9a..daf1ea5075a6 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -170,9 +170,6 @@ struct i915_gem_context {
 
 	struct i915_sched_attr sched;
 
-	/** ring_size: size for allocating the per-engine ring buffer */
-	u32 ring_size;
-
 	/** guilty_count: How many times this context has caused a GPU hang. */
 	atomic_t guilty_count;
 	/**
diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
index 41d38e661de7..6d1d4e8dbfc9 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -222,6 +222,7 @@ intel_context_init(struct intel_context *ce,
 	ce->engine = engine;
 	ce->ops = engine->cops;
 	ce->sseu = engine->sseu;
+	ce->ring = __intel_context_ring_size(SZ_16K);
 
 	INIT_LIST_HEAD(&ce->signal_link);
 	INIT_LIST_HEAD(&ce->signals);
diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h
index 07f9924de48f..13f28dd316bc 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.h
+++ b/drivers/gpu/drm/i915/gt/intel_context.h
@@ -136,4 +136,9 @@ int intel_context_prepare_remote_request(struct intel_context *ce,
 
 struct i915_request *intel_context_create_request(struct intel_context *ce);
 
+static inline struct intel_ring *__intel_context_ring_size(u64 sz)
+{
+	return u64_to_ptr(struct intel_ring, sz);
+}
+
 #endif /* __INTEL_CONTEXT_H__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 5748079ebce2..9b13ce11e99c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -738,6 +738,8 @@ static int pin_context(struct i915_gem_context *ctx,
 	if (IS_ERR(ce))
 		return PTR_ERR(ce);
 
+	ce->ring = __intel_context_ring_size(SZ_4K);
+
 	err = intel_context_pin(ce);
 	intel_context_put(ce);
 	if (err)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 2175ed2c15a4..2a7e45fcda9c 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -3234,9 +3234,8 @@ static int __execlists_context_alloc(struct intel_context *ce,
 		goto error_deref_obj;
 	}
 
-	ring = intel_engine_create_ring(engine,
-					timeline,
-					ce->gem_context->ring_size);
+	ring = intel_engine_create_ring(engine, timeline,
+					(unsigned long)ce->ring);
 	intel_timeline_put(timeline);
 	if (IS_ERR(ring)) {
 		ret = PTR_ERR(ring);
diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
index e232c1998540..bb69f51ccbfa 100644
--- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
@@ -2349,7 +2349,7 @@ int intel_ring_submission_init(struct intel_engine_cs *engine)
 	}
 	GEM_BUG_ON(timeline->has_initial_breadcrumb);
 
-	ring = intel_engine_create_ring(engine, timeline, 32 * PAGE_SIZE);
+	ring = intel_engine_create_ring(engine, timeline, SZ_16K);
 	intel_timeline_put(timeline);
 	if (IS_ERR(ring)) {
 		err = PTR_ERR(ring);
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
index 2690922eed56..3aca88604d2d 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -140,7 +140,7 @@ static void mock_context_destroy(struct kref *ref)
 
 	GEM_BUG_ON(intel_context_is_pinned(ce));
 
-	if (ce->ring)
+	if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags))
 		mock_ring_free(ce->ring);
 
 	intel_context_fini(ce);
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 6659b616344a..70c33eac2f87 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -308,10 +308,14 @@ static void print_context_stats(struct seq_file *m,
 
 		for_each_gem_engine(ce,
 				    i915_gem_context_lock_engines(ctx), it) {
-			if (ce->state)
-				per_file_stats(0, ce->state->obj, &kstats);
-			if (ce->ring)
+			intel_context_lock_pinned(ce);
+			if (intel_context_is_pinned(ce)) {
+				if (ce->state)
+					per_file_stats(0,
+						       ce->state->obj, &kstats);
 				per_file_stats(0, ce->ring->vma->obj, &kstats);
+			}
+			intel_context_unlock_pinned(ce);
 		}
 		i915_gem_context_unlock_engines(ctx);
 
@@ -1611,12 +1615,15 @@ static int i915_context_status(struct seq_file *m, void *unused)
 
 		for_each_gem_engine(ce,
 				    i915_gem_context_lock_engines(ctx), it) {
-			seq_printf(m, "%s: ", ce->engine->name);
-			if (ce->state)
-				describe_obj(m, ce->state->obj);
-			if (ce->ring)
+			intel_context_lock_pinned(ce);
+			if (intel_context_is_pinned(ce)) {
+				seq_printf(m, "%s: ", ce->engine->name);
+				if (ce->state)
+					describe_obj(m, ce->state->obj);
 				describe_ctx_ring(m, ce->ring);
-			seq_putc(m, '\n');
+				seq_putc(m, '\n');
+			}
+			intel_context_unlock_pinned(ce);
 		}
 		i915_gem_context_unlock_engines(ctx);
 
-- 
2.23.0.rc1



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