[Intel-gfx] [PATCH 09/17] drm/i915: Push the ring creation flags to the backend

Chris Wilson chris at chris-wilson.co.uk
Tue Jul 30 13:30:27 UTC 2019


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

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c   | 21 +++++++++++------
 .../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         |  9 ++++++--
 drivers/gpu/drm/i915/i915_debugfs.c           | 23 ++++++++++++-------
 9 files changed, 47 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 1b3dc7258ef2..2e8cedce059f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -434,8 +434,6 @@ __create_context(struct drm_i915_private *i915)
 	i915_gem_context_set_bannable(ctx);
 	i915_gem_context_set_recoverable(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;
 
@@ -565,8 +563,15 @@ 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);
-	if (!USES_GUC_SUBMISSION(to_i915(dev)))
-		ctx->ring_size = 512 * PAGE_SIZE; /* Max ring buffer size */
+	if (!USES_GUC_SUBMISSION(to_i915(dev))) {
+		const unsigned long ring_size = 512 * SZ_4K; /* max */
+		struct i915_gem_engines_iter it;
+		struct intel_context *ce;
+
+		for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it)
+			ce->ring = __intel_context_ring_size(ring_size);
+		i915_gem_context_unlock_engines(ctx);
+	}
 
 	GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
 out:
@@ -605,7 +610,6 @@ 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));
 
@@ -1589,6 +1593,7 @@ 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);
@@ -1611,11 +1616,13 @@ 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 a02d98494078..260d59cc3de8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -169,9 +169,6 @@ 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 34c8e37a73b8..db9236570ff5 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -214,6 +214,7 @@ 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 65cbf1d9118d..97ce3589338e 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -783,6 +783,8 @@ 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 232f40fcb490..5e113ddbe273 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -3108,9 +3108,8 @@ static int execlists_context_deferred_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 8d24a49e5139..ebda379f7bac 100644
--- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
@@ -2342,7 +2342,7 @@ 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 10cb312462e5..bf2dc1142f3c 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -133,13 +133,18 @@ static void mock_context_unpin(struct intel_context *ce)
 	mock_timeline_unpin(ce->ring->timeline);
 }
 
+static bool has_ring(struct intel_context *ce)
+{
+	return ce->ring > __intel_context_ring_size(SZ_16K);
+}
+
 static void mock_context_destroy(struct kref *ref)
 {
 	struct intel_context *ce = container_of(ref, typeof(*ce), ref);
 
 	GEM_BUG_ON(intel_context_is_pinned(ce));
 
-	if (ce->ring)
+	if (has_ring(ce))
 		mock_ring_free(ce->ring);
 
 	intel_context_fini(ce);
@@ -150,7 +155,7 @@ static int mock_context_pin(struct intel_context *ce)
 {
 	int ret;
 
-	if (!ce->ring) {
+	if (!has_ring(ce)) {
 		ce->ring = mock_ring(ce->engine);
 		if (!ce->ring)
 			return -ENOMEM;
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 24787bb48c9f..0ff504f79779 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -328,10 +328,14 @@ 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);
 
@@ -1677,12 +1681,15 @@ 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);
 
-- 
2.22.0



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