drm: v3d: Switch to use drm_gem_object reservation_object

Now that the base struct drm_gem_object has a reservation_object, use it
and remove the private BO one.

Cc: Eric Anholt <eric@anholt.net>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190202154158.10443-5-robh@kernel.orgSigned-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

drivers/gpu/drm/v3d/v3d_bo.c

@@ -155,9 +155,6 @@ struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv,
 		return bo;
 	obj = &bo->base;
 
-	bo->resv = &bo->_resv;
-	reservation_object_init(bo->resv);
-
 	ret = v3d_bo_get_pages(bo);
 	if (ret)
 		goto free_mm;
@@ -194,8 +191,6 @@ void v3d_free_object(struct drm_gem_object *obj)
 	v3d->bo_stats.pages_allocated -= obj->size >> PAGE_SHIFT;
 	mutex_unlock(&v3d->bo_lock);
 
-	reservation_object_fini(&bo->_resv);
-
 	v3d_bo_put_pages(bo);
 
 	if (obj->import_attach)
@@ -212,13 +207,6 @@ void v3d_free_object(struct drm_gem_object *obj)
 	kfree(bo);
 }
 
-struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj)
-{
-	struct v3d_bo *bo = to_v3d_bo(obj);
-
-	return bo->resv;
-}
-
 static void
 v3d_set_mmap_vma_flags(struct vm_area_struct *vma)
 {
@@ -291,7 +279,7 @@ v3d_prime_import_sg_table(struct drm_device *dev,
 		return ERR_CAST(bo);
 	obj = &bo->base;
 
-	bo->resv = attach->dmabuf->resv;
+	obj->resv = attach->dmabuf->resv;
 
 	bo->sgt = sgt;
 	obj->import_attach = attach;

drivers/gpu/drm/v3d/v3d_drv.c

@@ -214,7 +214,6 @@ static struct drm_driver v3d_drm_driver = {
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_import = drm_gem_prime_import,
 	.gem_prime_export = drm_gem_prime_export,
-	.gem_prime_res_obj = v3d_prime_res_obj,
 	.gem_prime_get_sg_table	= v3d_prime_get_sg_table,
 	.gem_prime_import_sg_table = v3d_prime_import_sg_table,
 	.gem_prime_mmap = v3d_prime_mmap,

drivers/gpu/drm/v3d/v3d_drv.h

 // SPDX-License-Identifier: GPL-2.0+
 /* Copyright (C) 2015-2018 Broadcom */
 
-#include <linux/reservation.h>
 #include <linux/mm_types.h>
 #include <drm/drmP.h>
 #include <drm/drm_encoder.h>
@@ -133,10 +132,6 @@ struct v3d_bo {
 	 * v3d_exec_info->unref_list
 	 */
 	struct list_head unref_head;
-
-	/* normally (resv == &_resv) except for imported bo's */
-	struct reservation_object *resv;
-	struct reservation_object _resv;
 };
 
 static inline struct v3d_bo *
@@ -281,7 +276,6 @@ int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data,
 			    struct drm_file *file_priv);
 vm_fault_t v3d_gem_fault(struct vm_fault *vmf);
 int v3d_mmap(struct file *filp, struct vm_area_struct *vma);
-struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj);
 int v3d_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
 struct sg_table *v3d_prime_get_sg_table(struct drm_gem_object *obj);
 struct drm_gem_object *v3d_prime_import_sg_table(struct drm_device *dev,

drivers/gpu/drm/v3d/v3d_gem.c

@@ -190,7 +190,7 @@ v3d_attach_object_fences(struct v3d_bo **bos, int bo_count,
 
 	for (i = 0; i < bo_count; i++) {
 		/* XXX: Use shared fences for read-only objects. */
-		reservation_object_add_excl_fence(bos[i]->resv, fence);
+		reservation_object_add_excl_fence(bos[i]->base.resv, fence);
 	}
 }
 
@@ -202,7 +202,7 @@ v3d_unlock_bo_reservations(struct v3d_bo **bos,
 	int i;
 
 	for (i = 0; i < bo_count; i++)
-		ww_mutex_unlock(&bos[i]->resv->lock);
+		ww_mutex_unlock(&bos[i]->base.resv->lock);
 
 	ww_acquire_fini(acquire_ctx);
 }
@@ -228,7 +228,7 @@ v3d_lock_bo_reservations(struct v3d_bo **bos,
 	if (contended_lock != -1) {
 		struct v3d_bo *bo = bos[contended_lock];
 
-		ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
+		ret = ww_mutex_lock_slow_interruptible(&bo->base.resv->lock,
 						       acquire_ctx);
 		if (ret) {
 			ww_acquire_done(acquire_ctx);
@@ -240,18 +240,18 @@ v3d_lock_bo_reservations(struct v3d_bo **bos,
 		if (i == contended_lock)
 			continue;
 
-		ret = ww_mutex_lock_interruptible(&bos[i]->resv->lock,
+		ret = ww_mutex_lock_interruptible(&bos[i]->base.resv->lock,
 						  acquire_ctx);
 		if (ret) {
 			int j;
 
 			for (j = 0; j < i; j++)
-				ww_mutex_unlock(&bos[j]->resv->lock);
+				ww_mutex_unlock(&bos[j]->base.resv->lock);
 
 			if (contended_lock != -1 && contended_lock >= i) {
 				struct v3d_bo *bo = bos[contended_lock];
 
-				ww_mutex_unlock(&bo->resv->lock);
+				ww_mutex_unlock(&bo->base.resv->lock);
 			}
 
 			if (ret == -EDEADLK) {
@@ -270,7 +270,7 @@ v3d_lock_bo_reservations(struct v3d_bo **bos,
 	 * before we commit the CL to the hardware.
 	 */
 	for (i = 0; i < bo_count; i++) {
-		ret = reservation_object_reserve_shared(bos[i]->resv, 1);
+		ret = reservation_object_reserve_shared(bos[i]->base.resv, 1);
 		if (ret) {
 			v3d_unlock_bo_reservations(bos, bo_count,
 						   acquire_ctx);
@@ -429,8 +429,6 @@ v3d_wait_bo_ioctl(struct drm_device *dev, void *data,
 {
 	int ret;
 	struct drm_v3d_wait_bo *args = data;
-	struct drm_gem_object *gem_obj;
-	struct v3d_bo *bo;
 	ktime_t start = ktime_get();
 	u64 delta_ns;
 	unsigned long timeout_jiffies =
@@ -439,21 +437,8 @@ v3d_wait_bo_ioctl(struct drm_device *dev, void *data,
 	if (args->pad != 0)
 		return -EINVAL;
 
-	gem_obj = drm_gem_object_lookup(file_priv, args->handle);
-	if (!gem_obj) {
-		DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
-		return -EINVAL;
-	}
-	bo = to_v3d_bo(gem_obj);
-
-	ret = reservation_object_wait_timeout_rcu(bo->resv,
-						  true, true,
-						  timeout_jiffies);
-
-	if (ret == 0)
-		ret = -ETIME;
-	else if (ret > 0)
-		ret = 0;
+	ret = drm_gem_reservation_object_wait(file_priv, args->handle,
+					      true, timeout_jiffies);
 
 	/* Decrement the user's timeout, in case we got interrupted
 	 * such that the ioctl will be restarted.
@@ -468,8 +453,6 @@ v3d_wait_bo_ioctl(struct drm_device *dev, void *data,
 	if (ret == -ETIME && args->timeout_ns)
 		ret = -EAGAIN;
 
-	drm_gem_object_put_unlocked(gem_obj);
-
 	return ret;
 }