12 files changed, 40 insertions, 140 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 424dff5d0aba..7226f419e178 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1104,8 +1104,7 @@ nouveau_bo_vma_del(struct nouveau_bo *nvbo, struct nouveau_vma *vma)
         if (vma->node) {
                 if (nvbo->bo.mem.mem_type != TTM_PL_SYSTEM) {
                         spin_lock(&nvbo->bo.bdev->fence_lock);
-                        ttm_bo_wait(&nvbo->bo, false, false, false,
-                                    TTM_USAGE_READWRITE);
+                        ttm_bo_wait(&nvbo->bo, false, false, false);
                         spin_unlock(&nvbo->bo.bdev->fence_lock);
                         nouveau_vm_unmap(vma);
                 }
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 322bf62a0645..5f0bc57fdaab 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -589,8 +589,7 @@ nouveau_gem_pushbuf_reloc_apply(struct drm_device *dev,
                 }
 
                 spin_lock(&nvbo->bo.bdev->fence_lock);
-                ret = ttm_bo_wait(&nvbo->bo, false, false, false,
-                                  TTM_USAGE_READWRITE);
+                ret = ttm_bo_wait(&nvbo->bo, false, false, false);
                 spin_unlock(&nvbo->bo.bdev->fence_lock);
                 if (ret) {
                         NV_ERROR(dev, "reloc wait_idle failed: %d\n", ret);
@@ -826,7 +825,7 @@ nouveau_gem_ioctl_cpu_prep(struct drm_device *dev, void *data,
         nvbo = nouveau_gem_object(gem);
 
         spin_lock(&nvbo->bo.bdev->fence_lock);
-        ret = ttm_bo_wait(&nvbo->bo, true, true, no_wait, TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(&nvbo->bo, true, true, no_wait);
         spin_unlock(&nvbo->bo.bdev->fence_lock);
         drm_gem_object_unreference_unlocked(gem);
         return ret;
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 14e853151105..fae00c0d75aa 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -80,7 +80,6 @@ int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
                         p->relocs[i].lobj.wdomain = r->write_domain;
                         p->relocs[i].lobj.rdomain = r->read_domains;
                         p->relocs[i].lobj.tv.bo = &p->relocs[i].robj->tbo;
-                        p->relocs[i].lobj.tv.usage = TTM_USAGE_READWRITE;
                         p->relocs[i].handle = r->handle;
                         p->relocs[i].flags = r->flags;
                         radeon_bo_list_add_object(&p->relocs[i].lobj,
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index b8f75f5d344b..1c851521f458 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -527,7 +527,7 @@ int radeon_bo_wait(struct radeon_bo *bo, u32 *mem_type, bool no_wait)
         if (mem_type)
                 *mem_type = bo->tbo.mem.mem_type;
         if (bo->tbo.sync_obj)
-                r = ttm_bo_wait(&bo->tbo, true, true, no_wait, false);
+                r = ttm_bo_wait(&bo->tbo, true, true, no_wait);
         spin_unlock(&bo->tbo.bdev->fence_lock);
         ttm_bo_unreserve(&bo->tbo);
         return r;
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 50fc8e4c9a31..617b64678fc6 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -499,7 +499,7 @@ static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
         int ret;
 
         spin_lock(&bdev->fence_lock);
-        (void) ttm_bo_wait(bo, false, false, true, TTM_USAGE_READWRITE);
+        (void) ttm_bo_wait(bo, false, false, true);
         if (!bo->sync_obj) {
 
                 spin_lock(&glob->lru_lock);
@@ -567,8 +567,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 
 retry:
         spin_lock(&bdev->fence_lock);
-        ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
-                          TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
         spin_unlock(&bdev->fence_lock);
 
         if (unlikely(ret != 0))
@@ -727,8 +726,7 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
         int ret = 0;
 
         spin_lock(&bdev->fence_lock);
-        ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
-                          TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
         spin_unlock(&bdev->fence_lock);
 
         if (unlikely(ret != 0)) {
@@ -1075,8 +1073,7 @@ int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
          * instead of doing it here.
          */
         spin_lock(&bdev->fence_lock);
-        ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
-                          TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
         spin_unlock(&bdev->fence_lock);
         if (ret)
                 return ret;
@@ -1697,83 +1694,34 @@ out_unlock:
         return ret;
 }
 
-static void ttm_bo_unref_sync_obj_locked(struct ttm_buffer_object *bo,
-                                         void *sync_obj,
-                                         void **extra_sync_obj)
-{
-        struct ttm_bo_device *bdev = bo->bdev;
-        struct ttm_bo_driver *driver = bdev->driver;
-        void *tmp_obj = NULL, *tmp_obj_read = NULL, *tmp_obj_write = NULL;
-
-        /* We must unref the sync obj wherever it's ref'd.
-         * Note that if we unref bo->sync_obj, we can unref both the read
-         * and write sync objs too, because they can't be newer than
-         * bo->sync_obj, so they are no longer relevant. */
-        if (sync_obj == bo->sync_obj ||
-            sync_obj == bo->sync_obj_read) {
-                tmp_obj_read = bo->sync_obj_read;
-                bo->sync_obj_read = NULL;
-        }
-        if (sync_obj == bo->sync_obj ||
-            sync_obj == bo->sync_obj_write) {
-                tmp_obj_write = bo->sync_obj_write;
-                bo->sync_obj_write = NULL;
-        }
-        if (sync_obj == bo->sync_obj) {
-                tmp_obj = bo->sync_obj;
-                bo->sync_obj = NULL;
-        }
-
-        clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
-        spin_unlock(&bdev->fence_lock);
-        if (tmp_obj)
-                driver->sync_obj_unref(&tmp_obj);
-        if (tmp_obj_read)
-                driver->sync_obj_unref(&tmp_obj_read);
-        if (tmp_obj_write)
-                driver->sync_obj_unref(&tmp_obj_write);
-        if (extra_sync_obj)
-                driver->sync_obj_unref(extra_sync_obj);
-        spin_lock(&bdev->fence_lock);
-}
-
 int ttm_bo_wait(struct ttm_buffer_object *bo,
-                bool lazy, bool interruptible, bool no_wait,
-                enum ttm_buffer_usage usage)
+                bool lazy, bool interruptible, bool no_wait)
 {
         struct ttm_bo_driver *driver = bo->bdev->driver;
         struct ttm_bo_device *bdev = bo->bdev;
         void *sync_obj;
         void *sync_obj_arg;
         int ret = 0;
-        void **bo_sync_obj;
 
-        switch (usage) {
-        case TTM_USAGE_READ:
-                bo_sync_obj = &bo->sync_obj_read;
-                break;
-        case TTM_USAGE_WRITE:
-                bo_sync_obj = &bo->sync_obj_write;
-                break;
-        case TTM_USAGE_READWRITE:
-        default:
-                bo_sync_obj = &bo->sync_obj;
-        }
-
-        if (likely(*bo_sync_obj == NULL))
+        if (likely(bo->sync_obj == NULL))
                 return 0;
 
-        while (*bo_sync_obj) {
+        while (bo->sync_obj) {
 
-                if (driver->sync_obj_signaled(*bo_sync_obj, bo->sync_obj_arg)) {
-                        ttm_bo_unref_sync_obj_locked(bo, *bo_sync_obj, NULL);
+                if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
+                        void *tmp_obj = bo->sync_obj;
+                        bo->sync_obj = NULL;
+                        clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
+                        spin_unlock(&bdev->fence_lock);
+                        driver->sync_obj_unref(&tmp_obj);
+                        spin_lock(&bdev->fence_lock);
                         continue;
                 }
 
                 if (no_wait)
                         return -EBUSY;
 
-                sync_obj = driver->sync_obj_ref(*bo_sync_obj);
+                sync_obj = driver->sync_obj_ref(bo->sync_obj);
                 sync_obj_arg = bo->sync_obj_arg;
                 spin_unlock(&bdev->fence_lock);
                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
@@ -1784,9 +1732,16 @@ int ttm_bo_wait(struct ttm_buffer_object *bo,
                         return ret;
                 }
                 spin_lock(&bdev->fence_lock);
-                if (likely(*bo_sync_obj == sync_obj &&
+                if (likely(bo->sync_obj == sync_obj &&
                            bo->sync_obj_arg == sync_obj_arg)) {
-                        ttm_bo_unref_sync_obj_locked(bo, *bo_sync_obj, &sync_obj);
+                        void *tmp_obj = bo->sync_obj;
+                        bo->sync_obj = NULL;
+                        clear_bit(TTM_BO_PRIV_FLAG_MOVING,
+                                  &bo->priv_flags);
+                        spin_unlock(&bdev->fence_lock);
+                        driver->sync_obj_unref(&sync_obj);
+                        driver->sync_obj_unref(&tmp_obj);
+                        spin_lock(&bdev->fence_lock);
                 } else {
                         spin_unlock(&bdev->fence_lock);
                         driver->sync_obj_unref(&sync_obj);
@@ -1810,7 +1765,7 @@ int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
         if (unlikely(ret != 0))
                 return ret;
         spin_lock(&bdev->fence_lock);
-        ret = ttm_bo_wait(bo, false, true, no_wait, TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(bo, false, true, no_wait);
         spin_unlock(&bdev->fence_lock);
         if (likely(ret == 0))
                 atomic_inc(&bo->cpu_writers);
@@ -1884,7 +1839,7 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
          */
 
         spin_lock(&bo->bdev->fence_lock);
-        ret = ttm_bo_wait(bo, false, false, false, TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(bo, false, false, false);
         spin_unlock(&bo->bdev->fence_lock);
 
         if (unlikely(ret != 0))
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 6135f58169ce..ae3c6f5dd2b7 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -436,8 +436,6 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
         atomic_set(&fbo->cpu_writers, 0);
 
         fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
-        fbo->sync_obj_read = driver->sync_obj_ref(bo->sync_obj_read);
-        fbo->sync_obj_write = driver->sync_obj_ref(bo->sync_obj_write);
         kref_init(&fbo->list_kref);
         kref_init(&fbo->kref);
         fbo->destroy = &ttm_transfered_destroy;
@@ -620,30 +618,20 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
         struct ttm_mem_reg *old_mem = &bo->mem;
         int ret;
         struct ttm_buffer_object *ghost_obj;
-        void *tmp_obj = NULL, *tmp_obj_read = NULL, *tmp_obj_write = NULL;
+        void *tmp_obj = NULL;
 
         spin_lock(&bdev->fence_lock);
-        if (bo->sync_obj)
+        if (bo->sync_obj) {
                 tmp_obj = bo->sync_obj;
-        if (bo->sync_obj_read)
-                tmp_obj_read = bo->sync_obj_read;
-        if (bo->sync_obj_write)
-                tmp_obj_write = bo->sync_obj_write;
-
+                bo->sync_obj = NULL;
+        }
         bo->sync_obj = driver->sync_obj_ref(sync_obj);
-        bo->sync_obj_read = driver->sync_obj_ref(sync_obj);
-        bo->sync_obj_write = driver->sync_obj_ref(sync_obj);
         bo->sync_obj_arg = sync_obj_arg;
         if (evict) {
-                ret = ttm_bo_wait(bo, false, false, false,
-                                  TTM_USAGE_READWRITE);
+                ret = ttm_bo_wait(bo, false, false, false);
                 spin_unlock(&bdev->fence_lock);
                 if (tmp_obj)
                         driver->sync_obj_unref(&tmp_obj);
-                if (tmp_obj_read)
-                        driver->sync_obj_unref(&tmp_obj_read);
-                if (tmp_obj_write)
-                        driver->sync_obj_unref(&tmp_obj_write);
                 if (ret)
                         return ret;
 
@@ -667,10 +655,6 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
                 spin_unlock(&bdev->fence_lock);
                 if (tmp_obj)
                         driver->sync_obj_unref(&tmp_obj);
-                if (tmp_obj_read)
-                        driver->sync_obj_unref(&tmp_obj_read);
-                if (tmp_obj_write)
-                        driver->sync_obj_unref(&tmp_obj_write);
 
                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
                 if (ret)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index ff1e26f4b094..221b924acebe 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -122,7 +122,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
         spin_lock(&bdev->fence_lock);
         if (test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)) {
-                ret = ttm_bo_wait(bo, false, true, false, TTM_USAGE_READWRITE);
+                ret = ttm_bo_wait(bo, false, true, false);
                 spin_unlock(&bdev->fence_lock);
                 if (unlikely(ret != 0)) {
                         retval = (ret != -ERESTARTSYS) ?
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 36d111a88232..3832fe10b4df 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -221,18 +221,8 @@ void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
 
         list_for_each_entry(entry, list, head) {
                 bo = entry->bo;
-                entry->old_sync_obj_read = NULL;
-                entry->old_sync_obj_write = NULL;
                 entry->old_sync_obj = bo->sync_obj;
                 bo->sync_obj = driver->sync_obj_ref(sync_obj);
-                if (entry->usage & TTM_USAGE_READ) {
-                        entry->old_sync_obj_read = bo->sync_obj_read;
-                        bo->sync_obj_read = driver->sync_obj_ref(sync_obj);
-                }
-                if (entry->usage & TTM_USAGE_WRITE) {
-                        entry->old_sync_obj_write = bo->sync_obj_write;
-                        bo->sync_obj_write = driver->sync_obj_ref(sync_obj);
-                }
                 bo->sync_obj_arg = entry->new_sync_obj_arg;
                 ttm_bo_unreserve_locked(bo);
                 entry->reserved = false;
@@ -241,15 +231,8 @@ void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
         spin_unlock(&bdev->fence_lock);
 
         list_for_each_entry(entry, list, head) {
-                if (entry->old_sync_obj) {
+                if (entry->old_sync_obj)
                         driver->sync_obj_unref(&entry->old_sync_obj);
-                }
-                if (entry->old_sync_obj_read) {
-                        driver->sync_obj_unref(&entry->old_sync_obj_read);
-                }
-                if (entry->old_sync_obj_write) {
-                        driver->sync_obj_unref(&entry->old_sync_obj_write);
-                }
         }
 }
 EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index b8eb8cdcfb78..13afddc1f034 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -244,7 +244,7 @@ static void vmw_dummy_query_bo_prepare(struct vmw_private *dev_priv)
 
         ttm_bo_reserve(bo, false, false, false, 0);
         spin_lock(&bdev->fence_lock);
-        ret = ttm_bo_wait(bo, false, false, false, TTM_USAGE_READWRITE);
+        ret = ttm_bo_wait(bo, false, false, false);
         spin_unlock(&bdev->fence_lock);
         if (unlikely(ret != 0))
                 (void) vmw_fallback_wait(dev_priv, false, true, 0, false,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 28e1c35aec6f..40932fbdac0f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -89,7 +89,6 @@ static int vmw_bo_to_validate_list(struct vmw_sw_context *sw_context,
         if (unlikely(val_node == sw_context->cur_val_buf)) {
                 val_buf->new_sync_obj_arg = NULL;
                 val_buf->bo = ttm_bo_reference(bo);
-                val_buf->usage = TTM_USAGE_READWRITE;
                 list_add_tail(&val_buf->head, &sw_context->validate_nodes);
                 ++sw_context->cur_val_buf;
         }
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index da957bf3fe44..42e346985186 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -44,11 +44,6 @@ struct ttm_bo_device;
 
 struct drm_mm_node;
 
-enum ttm_buffer_usage {
-    TTM_USAGE_READ = 1,
-    TTM_USAGE_WRITE = 2,
-    TTM_USAGE_READWRITE = TTM_USAGE_READ | TTM_USAGE_WRITE
-};
 
 /**
  * struct ttm_placement
@@ -179,10 +174,7 @@ struct ttm_tt;
  * the bo_device::lru_lock.
  * @reserved: Deadlock-free lock used for synchronization state transitions.
  * @sync_obj_arg: Opaque argument to synchronization object function.
- * @sync_obj: Pointer to a synchronization object of a last read or write,
- * whichever is later.
- * @sync_obj_read: Pointer to a synchronization object of a last read.
- * @sync_obj_write: Pointer to a synchronization object of a last write.
+ * @sync_obj: Pointer to a synchronization object.
  * @priv_flags: Flags describing buffer object internal state.
  * @vm_rb: Rb node for the vm rb tree.
  * @vm_node: Address space manager node.
@@ -266,8 +258,6 @@ struct ttm_buffer_object {
 
         void *sync_obj_arg;
         void *sync_obj;
-        void *sync_obj_read;
-        void *sync_obj_write;
         unsigned long priv_flags;
 
         /**
@@ -335,7 +325,6 @@ ttm_bo_reference(struct ttm_buffer_object *bo)
  * @bo:  The buffer object.
  * @interruptible:  Use interruptible wait.
  * @no_wait:  Return immediately if buffer is busy.
- * @usage:  Whether to wait for the last read and/or the last write.
  *
  * This function must be called with the bo::mutex held, and makes
  * sure any previous rendering to the buffer is completed.
@@ -345,8 +334,7 @@ ttm_bo_reference(struct ttm_buffer_object *bo)
  * Returns -ERESTARTSYS if interrupted by a signal.
  */
 extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy,
-                       bool interruptible, bool no_wait,
-                       enum ttm_buffer_usage usage);
+                       bool interruptible, bool no_wait);
 /**
  * ttm_bo_validate
  *
diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h
index 375f29902295..26cc7f9ffa41 100644
--- a/include/drm/ttm/ttm_execbuf_util.h
+++ b/include/drm/ttm/ttm_execbuf_util.h
@@ -41,26 +41,20 @@
  * @bo:             refcounted buffer object pointer.
  * @new_sync_obj_arg: New sync_obj_arg for @bo, to be used once
  * adding a new sync object.
- * @usage           Indicates how @bo is used by the device.
  * @reserved:       Indicates whether @bo has been reserved for validation.
  * @removed:        Indicates whether @bo has been removed from lru lists.
  * @put_count:      Number of outstanding references on bo::list_kref.
  * @old_sync_obj:   Pointer to a sync object about to be unreferenced
- * @old_sync_obj_read: Pointer to a read sync object about to be unreferenced.
- * @old_sync_obj_write: Pointer to a write sync object about to be unreferenced.
  */
 
 struct ttm_validate_buffer {
         struct list_head head;
         struct ttm_buffer_object *bo;
         void *new_sync_obj_arg;
-        enum ttm_buffer_usage usage;
         bool reserved;
         bool removed;
         int put_count;
         void *old_sync_obj;
-        void *old_sync_obj_read;
-        void *old_sync_obj_write;
 };
 
 /**