drm/i915: Use drm_gem_object.resv

Since commit 1ba62714 ("drm: Add reservation_object to
drm_gem_object"), struct drm_gem_object grew its own builtin
reservation_object rendering our own private one bloat. Remove our
redundant reservation_object and point into obj->base.resv instead.

References: 1ba62714 ("drm: Add reservation_object to drm_gem_object")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190618125858.7295-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/display/intel_display.c

@@ -14256,7 +14256,7 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 		 */
 		if (needs_modeset(crtc_state)) {
 			ret = i915_sw_fence_await_reservation(&intel_state->commit_ready,
-							      old_obj->resv, NULL,
+							      old_obj->base.resv, NULL,
 							      false, 0,
 							      GFP_KERNEL);
 			if (ret < 0)
@@ -14300,13 +14300,13 @@ intel_prepare_plane_fb(struct drm_plane *plane,
 		struct dma_fence *fence;
 
 		ret = i915_sw_fence_await_reservation(&intel_state->commit_ready,
-						      obj->resv, NULL,
+						      obj->base.resv, NULL,
 						      false, I915_FENCE_TIMEOUT,
 						      GFP_KERNEL);
 		if (ret < 0)
 			return ret;
 
-		fence = reservation_object_get_excl_rcu(obj->resv);
+		fence = reservation_object_get_excl_rcu(obj->base.resv);
 		if (fence) {
 			add_rps_boost_after_vblank(new_state->crtc, fence);
 			dma_fence_put(fence);

drivers/gpu/drm/i915/gem/i915_gem_busy.c

@@ -110,13 +110,14 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
 	 *
 	 */
 retry:
-	seq = raw_read_seqcount(&obj->resv->seq);
+	seq = raw_read_seqcount(&obj->base.resv->seq);
 
 	/* Translate the exclusive fence to the READ *and* WRITE engine */
-	args->busy = busy_check_writer(rcu_dereference(obj->resv->fence_excl));
+	args->busy =
+		busy_check_writer(rcu_dereference(obj->base.resv->fence_excl));
 
 	/* Translate shared fences to READ set of engines */
-	list = rcu_dereference(obj->resv->fence);
+	list = rcu_dereference(obj->base.resv->fence);
 	if (list) {
 		unsigned int shared_count = list->shared_count, i;
 
@@ -128,7 +129,7 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
 		}
 	}
 
-	if (args->busy && read_seqcount_retry(&obj->resv->seq, seq))
+	if (args->busy && read_seqcount_retry(&obj->base.resv->seq, seq))
 		goto retry;
 
 	err = 0;

drivers/gpu/drm/i915/gem/i915_gem_clflush.c

@@ -143,11 +143,12 @@ bool i915_gem_clflush_object(struct drm_i915_gem_object *obj,
 		dma_fence_get(&clflush->dma);
 
 		i915_sw_fence_await_reservation(&clflush->wait,
-						obj->resv, NULL,
+						obj->base.resv, NULL,
 						true, I915_FENCE_TIMEOUT,
 						I915_FENCE_GFP);
 
-		reservation_object_add_excl_fence(obj->resv, &clflush->dma);
+		reservation_object_add_excl_fence(obj->base.resv,
+						  &clflush->dma);
 
 		i915_sw_fence_commit(&clflush->wait);
 	} else if (obj->mm.pages) {

drivers/gpu/drm/i915/gem/i915_gem_client_blt.c

@@ -282,13 +282,13 @@ int i915_gem_schedule_fill_pages_blt(struct drm_i915_gem_object *obj,
 
 	i915_gem_object_lock(obj);
 	err = i915_sw_fence_await_reservation(&work->wait,
-					      obj->resv, NULL,
+					      obj->base.resv, NULL,
 					      true, I915_FENCE_TIMEOUT,
 					      I915_FENCE_GFP);
 	if (err < 0) {
 		dma_fence_set_error(&work->dma, err);
 	} else {
-		reservation_object_add_excl_fence(obj->resv, &work->dma);
+		reservation_object_add_excl_fence(obj->base.resv, &work->dma);
 		err = 0;
 	}
 	i915_gem_object_unlock(obj);

drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c

@@ -214,7 +214,7 @@ struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
 	exp_info.size = gem_obj->size;
 	exp_info.flags = flags;
 	exp_info.priv = gem_obj;
-	exp_info.resv = obj->resv;
+	exp_info.resv = obj->base.resv;
 
 	if (obj->ops->dmabuf_export) {
 		int ret = obj->ops->dmabuf_export(obj);
@@ -290,7 +290,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
 	drm_gem_private_object_init(dev, &obj->base, dma_buf->size);
 	i915_gem_object_init(obj, &i915_gem_object_dmabuf_ops);
 	obj->base.import_attach = attach;
-	obj->resv = dma_buf->resv;
+	obj->base.resv = dma_buf->resv;
 
 	/* We use GTT as shorthand for a coherent domain, one that is
 	 * neither in the GPU cache nor in the CPU cache, where all

drivers/gpu/drm/i915/gem/i915_gem_fence.c

@@ -73,12 +73,12 @@ i915_gem_object_lock_fence(struct drm_i915_gem_object *obj)
 		       0);
 
 	if (i915_sw_fence_await_reservation(&stub->chain,
-					    obj->resv, NULL,
+					    obj->base.resv, NULL,
 					    true, I915_FENCE_TIMEOUT,
 					    I915_FENCE_GFP) < 0)
 		goto err;
 
-	reservation_object_add_excl_fence(obj->resv, &stub->dma);
+	reservation_object_add_excl_fence(obj->base.resv, &stub->dma);
 
 	return &stub->dma;
 

drivers/gpu/drm/i915/gem/i915_gem_object.c

@@ -70,9 +70,6 @@ void i915_gem_object_init(struct drm_i915_gem_object *obj,
 
 	obj->ops = ops;
 
-	reservation_object_init(&obj->__builtin_resv);
-	obj->resv = &obj->__builtin_resv;
-
 	obj->frontbuffer_ggtt_origin = ORIGIN_GTT;
 	i915_active_request_init(&obj->frontbuffer_write,
 				 NULL, frontbuffer_retire);
@@ -233,7 +230,6 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
 		if (obj->base.import_attach)
 			drm_prime_gem_destroy(&obj->base, NULL);
 
-		reservation_object_fini(&obj->__builtin_resv);
 		drm_gem_object_release(&obj->base);
 
 		bitmap_free(obj->bit_17);

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -99,22 +99,22 @@ i915_gem_object_put(struct drm_i915_gem_object *obj)
 	__drm_gem_object_put(&obj->base);
 }
 
-#define assert_object_held(obj) reservation_object_assert_held((obj)->resv)
+#define assert_object_held(obj) reservation_object_assert_held((obj)->base.resv)
 
 static inline void i915_gem_object_lock(struct drm_i915_gem_object *obj)
 {
-	reservation_object_lock(obj->resv, NULL);
+	reservation_object_lock(obj->base.resv, NULL);
 }
 
 static inline int
 i915_gem_object_lock_interruptible(struct drm_i915_gem_object *obj)
 {
-	return reservation_object_lock_interruptible(obj->resv, NULL);
+	return reservation_object_lock_interruptible(obj->base.resv, NULL);
 }
 
 static inline void i915_gem_object_unlock(struct drm_i915_gem_object *obj)
 {
-	reservation_object_unlock(obj->resv);
+	reservation_object_unlock(obj->base.resv);
 }
 
 struct dma_fence *
@@ -373,7 +373,7 @@ i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
 	struct dma_fence *fence;
 
 	rcu_read_lock();
-	fence = reservation_object_get_excl_rcu(obj->resv);
+	fence = reservation_object_get_excl_rcu(obj->base.resv);
 	rcu_read_unlock();
 
 	if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))

drivers/gpu/drm/i915/gem/i915_gem_object_types.h

@@ -7,8 +7,6 @@
 #ifndef __I915_GEM_OBJECT_TYPES_H__
 #define __I915_GEM_OBJECT_TYPES_H__
 
-#include <linux/reservation.h>
-
 #include <drm/drm_gem.h>
 
 #include "i915_active.h"
@@ -228,18 +226,6 @@ struct drm_i915_gem_object {
 		bool quirked:1;
 	} mm;
 
-	/** Breadcrumb of last rendering to the buffer.
-	 * There can only be one writer, but we allow for multiple readers.
-	 * If there is a writer that necessarily implies that all other
-	 * read requests are complete - but we may only be lazily clearing
-	 * the read requests. A read request is naturally the most recent
-	 * request on a ring, so we may have two different write and read
-	 * requests on one ring where the write request is older than the
-	 * read request. This allows for the CPU to read from an active
-	 * buffer by only waiting for the write to complete.
-	 */
-	struct reservation_object *resv;
-
 	/** References from framebuffers, locks out tiling changes. */
 	unsigned int framebuffer_references;
 
@@ -262,8 +248,6 @@ struct drm_i915_gem_object {
 
 	/** for phys allocated objects */
 	struct drm_dma_handle *phys_handle;
-
-	struct reservation_object __builtin_resv;
 };
 
 static inline struct drm_i915_gem_object *

drivers/gpu/drm/i915/gem/i915_gem_wait.c

@@ -144,7 +144,7 @@ i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
 		unsigned int count, i;
 		int ret;
 
-		ret = reservation_object_get_fences_rcu(obj->resv,
+		ret = reservation_object_get_fences_rcu(obj->base.resv,
 							&excl, &count, &shared);
 		if (ret)
 			return ret;
@@ -156,7 +156,7 @@ i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
 
 		kfree(shared);
 	} else {
-		excl = reservation_object_get_excl_rcu(obj->resv);
+		excl = reservation_object_get_excl_rcu(obj->base.resv);
 	}
 
 	if (excl) {
@@ -180,7 +180,8 @@ i915_gem_object_wait(struct drm_i915_gem_object *obj,
 	might_sleep();
 	GEM_BUG_ON(timeout < 0);
 
-	timeout = i915_gem_object_wait_reservation(obj->resv, flags, timeout);
+	timeout = i915_gem_object_wait_reservation(obj->base.resv,
+						   flags, timeout);
 	return timeout < 0 ? timeout : 0;
 }
 

drivers/gpu/drm/i915/i915_gem_batch_pool.c

@@ -96,7 +96,7 @@ i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
 	list_for_each_entry(obj, list, batch_pool_link) {
 		/* The batches are strictly LRU ordered */
 		if (i915_gem_object_is_active(obj)) {
-			struct reservation_object *resv = obj->resv;
+			struct reservation_object *resv = obj->base.resv;
 
 			if (!reservation_object_test_signaled_rcu(resv, true))
 				break;
@@ -119,7 +119,7 @@ i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
 			}
 		}
 
-		GEM_BUG_ON(!reservation_object_test_signaled_rcu(obj->resv,
+		GEM_BUG_ON(!reservation_object_test_signaled_rcu(obj->base.resv,
 								 true));
 
 		if (obj->base.size >= size)

drivers/gpu/drm/i915/i915_request.c

@@ -1027,7 +1027,7 @@ i915_request_await_object(struct i915_request *to,
 		struct dma_fence **shared;
 		unsigned int count, i;
 
-		ret = reservation_object_get_fences_rcu(obj->resv,
+		ret = reservation_object_get_fences_rcu(obj->base.resv,
 							&excl, &count, &shared);
 		if (ret)
 			return ret;
@@ -1044,7 +1044,7 @@ i915_request_await_object(struct i915_request *to,
 			dma_fence_put(shared[i]);
 		kfree(shared);
 	} else {
-		excl = reservation_object_get_excl_rcu(obj->resv);
+		excl = reservation_object_get_excl_rcu(obj->base.resv);
 	}
 
 	if (excl) {

drivers/gpu/drm/i915/i915_vma.c

@@ -99,10 +99,10 @@ static void __i915_vma_retire(struct i915_active *ref)
 		return;
 
 	/* Prune the shared fence arrays iff completely idle (inc. external) */
-	if (reservation_object_trylock(obj->resv)) {
-		if (reservation_object_test_signaled_rcu(obj->resv, true))
-			reservation_object_add_excl_fence(obj->resv, NULL);
-		reservation_object_unlock(obj->resv);
+	if (reservation_object_trylock(obj->base.resv)) {
+		if (reservation_object_test_signaled_rcu(obj->base.resv, true))
+			reservation_object_add_excl_fence(obj->base.resv, NULL);
+		reservation_object_unlock(obj->base.resv);
 	}
 
 	/*
@@ -134,7 +134,7 @@ vma_create(struct drm_i915_gem_object *obj,
 	vma->vm = vm;
 	vma->ops = &vm->vma_ops;
 	vma->obj = obj;
-	vma->resv = obj->resv;
+	vma->resv = obj->base.resv;
 	vma->size = obj->base.size;
 	vma->display_alignment = I915_GTT_MIN_ALIGNMENT;