| /* |
| * Copyright 2017 Red Hat |
| * Parts ported from amdgpu (fence wait code). |
| * Copyright 2016 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| * Authors: |
| * |
| */ |
| |
| /** |
| * DOC: Overview |
| * |
| * DRM synchronisation objects (syncobj, see struct &drm_syncobj) provide a |
| * container for a synchronization primitive which can be used by userspace |
| * to explicitly synchronize GPU commands, can be shared between userspace |
| * processes, and can be shared between different DRM drivers. |
| * Their primary use-case is to implement Vulkan fences and semaphores. |
| * The syncobj userspace API provides ioctls for several operations: |
| * |
| * - Creation and destruction of syncobjs |
| * - Import and export of syncobjs to/from a syncobj file descriptor |
| * - Import and export a syncobj's underlying fence to/from a sync file |
| * - Reset a syncobj (set its fence to NULL) |
| * - Signal a syncobj (set a trivially signaled fence) |
| * - Wait for a syncobj's fence to appear and be signaled |
| * |
| * At it's core, a syncobj is simply a wrapper around a pointer to a struct |
| * &dma_fence which may be NULL. |
| * When a syncobj is first created, its pointer is either NULL or a pointer |
| * to an already signaled fence depending on whether the |
| * &DRM_SYNCOBJ_CREATE_SIGNALED flag is passed to |
| * &DRM_IOCTL_SYNCOBJ_CREATE. |
| * When GPU work which signals a syncobj is enqueued in a DRM driver, |
| * the syncobj fence is replaced with a fence which will be signaled by the |
| * completion of that work. |
| * When GPU work which waits on a syncobj is enqueued in a DRM driver, the |
| * driver retrieves syncobj's current fence at the time the work is enqueued |
| * waits on that fence before submitting the work to hardware. |
| * If the syncobj's fence is NULL, the enqueue operation is expected to fail. |
| * All manipulation of the syncobjs's fence happens in terms of the current |
| * fence at the time the ioctl is called by userspace regardless of whether |
| * that operation is an immediate host-side operation (signal or reset) or |
| * or an operation which is enqueued in some driver queue. |
| * &DRM_IOCTL_SYNCOBJ_RESET and &DRM_IOCTL_SYNCOBJ_SIGNAL can be used to |
| * manipulate a syncobj from the host by resetting its pointer to NULL or |
| * setting its pointer to a fence which is already signaled. |
| * |
| * |
| * Host-side wait on syncobjs |
| * -------------------------- |
| * |
| * &DRM_IOCTL_SYNCOBJ_WAIT takes an array of syncobj handles and does a |
| * host-side wait on all of the syncobj fences simultaneously. |
| * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL is set, the wait ioctl will wait on |
| * all of the syncobj fences to be signaled before it returns. |
| * Otherwise, it returns once at least one syncobj fence has been signaled |
| * and the index of a signaled fence is written back to the client. |
| * |
| * Unlike the enqueued GPU work dependencies which fail if they see a NULL |
| * fence in a syncobj, if &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT is set, |
| * the host-side wait will first wait for the syncobj to receive a non-NULL |
| * fence and then wait on that fence. |
| * If &DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT is not set and any one of the |
| * syncobjs in the array has a NULL fence, -EINVAL will be returned. |
| * Assuming the syncobj starts off with a NULL fence, this allows a client |
| * to do a host wait in one thread (or process) which waits on GPU work |
| * submitted in another thread (or process) without having to manually |
| * synchronize between the two. |
| * This requirement is inherited from the Vulkan fence API. |
| * |
| * |
| * Import/export of syncobjs |
| * ------------------------- |
| * |
| * &DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE and &DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD |
| * provide two mechanisms for import/export of syncobjs. |
| * |
| * The first lets the client import or export an entire syncobj to a file |
| * descriptor. |
| * These fd's are opaque and have no other use case, except passing the |
| * syncobj between processes. |
| * All exported file descriptors and any syncobj handles created as a |
| * result of importing those file descriptors own a reference to the |
| * same underlying struct &drm_syncobj and the syncobj can be used |
| * persistently across all the processes with which it is shared. |
| * The syncobj is freed only once the last reference is dropped. |
| * Unlike dma-buf, importing a syncobj creates a new handle (with its own |
| * reference) for every import instead of de-duplicating. |
| * The primary use-case of this persistent import/export is for shared |
| * Vulkan fences and semaphores. |
| * |
| * The second import/export mechanism, which is indicated by |
| * &DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE or |
| * &DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE lets the client |
| * import/export the syncobj's current fence from/to a &sync_file. |
| * When a syncobj is exported to a sync file, that sync file wraps the |
| * sycnobj's fence at the time of export and any later signal or reset |
| * operations on the syncobj will not affect the exported sync file. |
| * When a sync file is imported into a syncobj, the syncobj's fence is set |
| * to the fence wrapped by that sync file. |
| * Because sync files are immutable, resetting or signaling the syncobj |
| * will not affect any sync files whose fences have been imported into the |
| * syncobj. |
| */ |
| |
| #include <linux/anon_inodes.h> |
| #include <linux/file.h> |
| #include <linux/fs.h> |
| #include <linux/sched/signal.h> |
| #include <linux/sync_file.h> |
| #include <linux/uaccess.h> |
| |
| #include <drm/drm.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_file.h> |
| #include <drm/drm_gem.h> |
| #include <drm/drm_print.h> |
| #include <drm/drm_syncobj.h> |
| |
| #include "drm_internal.h" |
| |
| struct syncobj_wait_entry { |
| struct list_head node; |
| struct task_struct *task; |
| struct dma_fence *fence; |
| struct dma_fence_cb fence_cb; |
| u64 point; |
| }; |
| |
| static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj, |
| struct syncobj_wait_entry *wait); |
| |
| /** |
| * drm_syncobj_find - lookup and reference a sync object. |
| * @file_private: drm file private pointer |
| * @handle: sync object handle to lookup. |
| * |
| * Returns a reference to the syncobj pointed to by handle or NULL. The |
| * reference must be released by calling drm_syncobj_put(). |
| */ |
| struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private, |
| u32 handle) |
| { |
| struct drm_syncobj *syncobj; |
| |
| spin_lock(&file_private->syncobj_table_lock); |
| |
| /* Check if we currently have a reference on the object */ |
| syncobj = idr_find(&file_private->syncobj_idr, handle); |
| if (syncobj) |
| drm_syncobj_get(syncobj); |
| |
| spin_unlock(&file_private->syncobj_table_lock); |
| |
| return syncobj; |
| } |
| EXPORT_SYMBOL(drm_syncobj_find); |
| |
| static void drm_syncobj_fence_add_wait(struct drm_syncobj *syncobj, |
| struct syncobj_wait_entry *wait) |
| { |
| struct dma_fence *fence; |
| |
| if (wait->fence) |
| return; |
| |
| spin_lock(&syncobj->lock); |
| /* We've already tried once to get a fence and failed. Now that we |
| * have the lock, try one more time just to be sure we don't add a |
| * callback when a fence has already been set. |
| */ |
| fence = dma_fence_get(rcu_dereference_protected(syncobj->fence, 1)); |
| if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) { |
| dma_fence_put(fence); |
| list_add_tail(&wait->node, &syncobj->cb_list); |
| } else if (!fence) { |
| wait->fence = dma_fence_get_stub(); |
| } else { |
| wait->fence = fence; |
| } |
| spin_unlock(&syncobj->lock); |
| } |
| |
| static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj, |
| struct syncobj_wait_entry *wait) |
| { |
| if (!wait->node.next) |
| return; |
| |
| spin_lock(&syncobj->lock); |
| list_del_init(&wait->node); |
| spin_unlock(&syncobj->lock); |
| } |
| |
| /** |
| * drm_syncobj_add_point - add new timeline point to the syncobj |
| * @syncobj: sync object to add timeline point do |
| * @chain: chain node to use to add the point |
| * @fence: fence to encapsulate in the chain node |
| * @point: sequence number to use for the point |
| * |
| * Add the chain node as new timeline point to the syncobj. |
| */ |
| void drm_syncobj_add_point(struct drm_syncobj *syncobj, |
| struct dma_fence_chain *chain, |
| struct dma_fence *fence, |
| uint64_t point) |
| { |
| struct syncobj_wait_entry *cur, *tmp; |
| struct dma_fence *prev; |
| |
| dma_fence_get(fence); |
| |
| spin_lock(&syncobj->lock); |
| |
| prev = drm_syncobj_fence_get(syncobj); |
| /* You are adding an unorder point to timeline, which could cause payload returned from query_ioctl is 0! */ |
| if (prev && prev->seqno >= point) |
| DRM_ERROR("You are adding an unorder point to timeline!\n"); |
| dma_fence_chain_init(chain, prev, fence, point); |
| rcu_assign_pointer(syncobj->fence, &chain->base); |
| |
| list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) |
| syncobj_wait_syncobj_func(syncobj, cur); |
| spin_unlock(&syncobj->lock); |
| |
| /* Walk the chain once to trigger garbage collection */ |
| dma_fence_chain_for_each(fence, prev); |
| dma_fence_put(prev); |
| } |
| EXPORT_SYMBOL(drm_syncobj_add_point); |
| |
| /** |
| * drm_syncobj_replace_fence - replace fence in a sync object. |
| * @syncobj: Sync object to replace fence in |
| * @fence: fence to install in sync file. |
| * |
| * This replaces the fence on a sync object. |
| */ |
| void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, |
| struct dma_fence *fence) |
| { |
| struct dma_fence *old_fence; |
| struct syncobj_wait_entry *cur, *tmp; |
| |
| if (fence) |
| dma_fence_get(fence); |
| |
| spin_lock(&syncobj->lock); |
| |
| old_fence = rcu_dereference_protected(syncobj->fence, |
| lockdep_is_held(&syncobj->lock)); |
| rcu_assign_pointer(syncobj->fence, fence); |
| |
| if (fence != old_fence) { |
| list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) |
| syncobj_wait_syncobj_func(syncobj, cur); |
| } |
| |
| spin_unlock(&syncobj->lock); |
| |
| dma_fence_put(old_fence); |
| } |
| EXPORT_SYMBOL(drm_syncobj_replace_fence); |
| |
| /** |
| * drm_syncobj_assign_null_handle - assign a stub fence to the sync object |
| * @syncobj: sync object to assign the fence on |
| * |
| * Assign a already signaled stub fence to the sync object. |
| */ |
| static void drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj) |
| { |
| struct dma_fence *fence = dma_fence_get_stub(); |
| |
| drm_syncobj_replace_fence(syncobj, fence); |
| dma_fence_put(fence); |
| } |
| |
| /* 5s default for wait submission */ |
| #define DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT 5000000000ULL |
| /** |
| * drm_syncobj_find_fence - lookup and reference the fence in a sync object |
| * @file_private: drm file private pointer |
| * @handle: sync object handle to lookup. |
| * @point: timeline point |
| * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or not |
| * @fence: out parameter for the fence |
| * |
| * This is just a convenience function that combines drm_syncobj_find() and |
| * drm_syncobj_fence_get(). |
| * |
| * Returns 0 on success or a negative error value on failure. On success @fence |
| * contains a reference to the fence, which must be released by calling |
| * dma_fence_put(). |
| */ |
| int drm_syncobj_find_fence(struct drm_file *file_private, |
| u32 handle, u64 point, u64 flags, |
| struct dma_fence **fence) |
| { |
| struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle); |
| struct syncobj_wait_entry wait; |
| u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT); |
| int ret; |
| |
| if (!syncobj) |
| return -ENOENT; |
| |
| *fence = drm_syncobj_fence_get(syncobj); |
| |
| if (*fence) { |
| ret = dma_fence_chain_find_seqno(fence, point); |
| if (!ret) |
| goto out; |
| dma_fence_put(*fence); |
| } else { |
| ret = -EINVAL; |
| } |
| |
| if (!(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT)) |
| goto out; |
| |
| memset(&wait, 0, sizeof(wait)); |
| wait.task = current; |
| wait.point = point; |
| drm_syncobj_fence_add_wait(syncobj, &wait); |
| |
| do { |
| set_current_state(TASK_INTERRUPTIBLE); |
| if (wait.fence) { |
| ret = 0; |
| break; |
| } |
| if (timeout == 0) { |
| ret = -ETIME; |
| break; |
| } |
| |
| if (signal_pending(current)) { |
| ret = -ERESTARTSYS; |
| break; |
| } |
| |
| timeout = schedule_timeout(timeout); |
| } while (1); |
| |
| __set_current_state(TASK_RUNNING); |
| *fence = wait.fence; |
| |
| if (wait.node.next) |
| drm_syncobj_remove_wait(syncobj, &wait); |
| |
| out: |
| drm_syncobj_put(syncobj); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_syncobj_find_fence); |
| |
| /** |
| * drm_syncobj_free - free a sync object. |
| * @kref: kref to free. |
| * |
| * Only to be called from kref_put in drm_syncobj_put. |
| */ |
| void drm_syncobj_free(struct kref *kref) |
| { |
| struct drm_syncobj *syncobj = container_of(kref, |
| struct drm_syncobj, |
| refcount); |
| drm_syncobj_replace_fence(syncobj, NULL); |
| kfree(syncobj); |
| } |
| EXPORT_SYMBOL(drm_syncobj_free); |
| |
| /** |
| * drm_syncobj_create - create a new syncobj |
| * @out_syncobj: returned syncobj |
| * @flags: DRM_SYNCOBJ_* flags |
| * @fence: if non-NULL, the syncobj will represent this fence |
| * |
| * This is the first function to create a sync object. After creating, drivers |
| * probably want to make it available to userspace, either through |
| * drm_syncobj_get_handle() or drm_syncobj_get_fd(). |
| * |
| * Returns 0 on success or a negative error value on failure. |
| */ |
| int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags, |
| struct dma_fence *fence) |
| { |
| struct drm_syncobj *syncobj; |
| |
| syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL); |
| if (!syncobj) |
| return -ENOMEM; |
| |
| kref_init(&syncobj->refcount); |
| INIT_LIST_HEAD(&syncobj->cb_list); |
| spin_lock_init(&syncobj->lock); |
| |
| if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) |
| drm_syncobj_assign_null_handle(syncobj); |
| |
| if (fence) |
| drm_syncobj_replace_fence(syncobj, fence); |
| |
| *out_syncobj = syncobj; |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_syncobj_create); |
| |
| /** |
| * drm_syncobj_get_handle - get a handle from a syncobj |
| * @file_private: drm file private pointer |
| * @syncobj: Sync object to export |
| * @handle: out parameter with the new handle |
| * |
| * Exports a sync object created with drm_syncobj_create() as a handle on |
| * @file_private to userspace. |
| * |
| * Returns 0 on success or a negative error value on failure. |
| */ |
| int drm_syncobj_get_handle(struct drm_file *file_private, |
| struct drm_syncobj *syncobj, u32 *handle) |
| { |
| int ret; |
| |
| /* take a reference to put in the idr */ |
| drm_syncobj_get(syncobj); |
| |
| idr_preload(GFP_KERNEL); |
| spin_lock(&file_private->syncobj_table_lock); |
| ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT); |
| spin_unlock(&file_private->syncobj_table_lock); |
| |
| idr_preload_end(); |
| |
| if (ret < 0) { |
| drm_syncobj_put(syncobj); |
| return ret; |
| } |
| |
| *handle = ret; |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_syncobj_get_handle); |
| |
| static int drm_syncobj_create_as_handle(struct drm_file *file_private, |
| u32 *handle, uint32_t flags) |
| { |
| int ret; |
| struct drm_syncobj *syncobj; |
| |
| ret = drm_syncobj_create(&syncobj, flags, NULL); |
| if (ret) |
| return ret; |
| |
| ret = drm_syncobj_get_handle(file_private, syncobj, handle); |
| drm_syncobj_put(syncobj); |
| return ret; |
| } |
| |
| static int drm_syncobj_destroy(struct drm_file *file_private, |
| u32 handle) |
| { |
| struct drm_syncobj *syncobj; |
| |
| spin_lock(&file_private->syncobj_table_lock); |
| syncobj = idr_remove(&file_private->syncobj_idr, handle); |
| spin_unlock(&file_private->syncobj_table_lock); |
| |
| if (!syncobj) |
| return -EINVAL; |
| |
| drm_syncobj_put(syncobj); |
| return 0; |
| } |
| |
| static int drm_syncobj_file_release(struct inode *inode, struct file *file) |
| { |
| struct drm_syncobj *syncobj = file->private_data; |
| |
| drm_syncobj_put(syncobj); |
| return 0; |
| } |
| |
| static const struct file_operations drm_syncobj_file_fops = { |
| .release = drm_syncobj_file_release, |
| }; |
| |
| /** |
| * drm_syncobj_get_fd - get a file descriptor from a syncobj |
| * @syncobj: Sync object to export |
| * @p_fd: out parameter with the new file descriptor |
| * |
| * Exports a sync object created with drm_syncobj_create() as a file descriptor. |
| * |
| * Returns 0 on success or a negative error value on failure. |
| */ |
| int drm_syncobj_get_fd(struct drm_syncobj *syncobj, int *p_fd) |
| { |
| struct file *file; |
| int fd; |
| |
| fd = get_unused_fd_flags(O_CLOEXEC); |
| if (fd < 0) |
| return fd; |
| |
| file = anon_inode_getfile("syncobj_file", |
| &drm_syncobj_file_fops, |
| syncobj, 0); |
| if (IS_ERR(file)) { |
| put_unused_fd(fd); |
| return PTR_ERR(file); |
| } |
| |
| drm_syncobj_get(syncobj); |
| fd_install(fd, file); |
| |
| *p_fd = fd; |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_syncobj_get_fd); |
| |
| static int drm_syncobj_handle_to_fd(struct drm_file *file_private, |
| u32 handle, int *p_fd) |
| { |
| struct drm_syncobj *syncobj = drm_syncobj_find(file_private, handle); |
| int ret; |
| |
| if (!syncobj) |
| return -EINVAL; |
| |
| ret = drm_syncobj_get_fd(syncobj, p_fd); |
| drm_syncobj_put(syncobj); |
| return ret; |
| } |
| |
| static int drm_syncobj_fd_to_handle(struct drm_file *file_private, |
| int fd, u32 *handle) |
| { |
| struct drm_syncobj *syncobj; |
| struct fd f = fdget(fd); |
| int ret; |
| |
| if (!f.file) |
| return -EINVAL; |
| |
| if (f.file->f_op != &drm_syncobj_file_fops) { |
| fdput(f); |
| return -EINVAL; |
| } |
| |
| /* take a reference to put in the idr */ |
| syncobj = f.file->private_data; |
| drm_syncobj_get(syncobj); |
| |
| idr_preload(GFP_KERNEL); |
| spin_lock(&file_private->syncobj_table_lock); |
| ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT); |
| spin_unlock(&file_private->syncobj_table_lock); |
| idr_preload_end(); |
| |
| if (ret > 0) { |
| *handle = ret; |
| ret = 0; |
| } else |
| drm_syncobj_put(syncobj); |
| |
| fdput(f); |
| return ret; |
| } |
| |
| static int drm_syncobj_import_sync_file_fence(struct drm_file *file_private, |
| int fd, int handle) |
| { |
| struct dma_fence *fence = sync_file_get_fence(fd); |
| struct drm_syncobj *syncobj; |
| |
| if (!fence) |
| return -EINVAL; |
| |
| syncobj = drm_syncobj_find(file_private, handle); |
| if (!syncobj) { |
| dma_fence_put(fence); |
| return -ENOENT; |
| } |
| |
| drm_syncobj_replace_fence(syncobj, fence); |
| dma_fence_put(fence); |
| drm_syncobj_put(syncobj); |
| return 0; |
| } |
| |
| static int drm_syncobj_export_sync_file(struct drm_file *file_private, |
| int handle, int *p_fd) |
| { |
| int ret; |
| struct dma_fence *fence; |
| struct sync_file *sync_file; |
| int fd = get_unused_fd_flags(O_CLOEXEC); |
| |
| if (fd < 0) |
| return fd; |
| |
| ret = drm_syncobj_find_fence(file_private, handle, 0, 0, &fence); |
| if (ret) |
| goto err_put_fd; |
| |
| sync_file = sync_file_create(fence); |
| |
| dma_fence_put(fence); |
| |
| if (!sync_file) { |
| ret = -EINVAL; |
| goto err_put_fd; |
| } |
| |
| fd_install(fd, sync_file->file); |
| |
| *p_fd = fd; |
| return 0; |
| err_put_fd: |
| put_unused_fd(fd); |
| return ret; |
| } |
| /** |
| * drm_syncobj_open - initalizes syncobj file-private structures at devnode open time |
| * @file_private: drm file-private structure to set up |
| * |
| * Called at device open time, sets up the structure for handling refcounting |
| * of sync objects. |
| */ |
| void |
| drm_syncobj_open(struct drm_file *file_private) |
| { |
| idr_init_base(&file_private->syncobj_idr, 1); |
| spin_lock_init(&file_private->syncobj_table_lock); |
| } |
| |
| static int |
| drm_syncobj_release_handle(int id, void *ptr, void *data) |
| { |
| struct drm_syncobj *syncobj = ptr; |
| |
| drm_syncobj_put(syncobj); |
| return 0; |
| } |
| |
| /** |
| * drm_syncobj_release - release file-private sync object resources |
| * @file_private: drm file-private structure to clean up |
| * |
| * Called at close time when the filp is going away. |
| * |
| * Releases any remaining references on objects by this filp. |
| */ |
| void |
| drm_syncobj_release(struct drm_file *file_private) |
| { |
| idr_for_each(&file_private->syncobj_idr, |
| &drm_syncobj_release_handle, file_private); |
| idr_destroy(&file_private->syncobj_idr); |
| } |
| |
| int |
| drm_syncobj_create_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_create *args = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| /* no valid flags yet */ |
| if (args->flags & ~DRM_SYNCOBJ_CREATE_SIGNALED) |
| return -EINVAL; |
| |
| return drm_syncobj_create_as_handle(file_private, |
| &args->handle, args->flags); |
| } |
| |
| int |
| drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_destroy *args = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| /* make sure padding is empty */ |
| if (args->pad) |
| return -EINVAL; |
| return drm_syncobj_destroy(file_private, args->handle); |
| } |
| |
| int |
| drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_handle *args = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad) |
| return -EINVAL; |
| |
| if (args->flags != 0 && |
| args->flags != DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) |
| return -EINVAL; |
| |
| if (args->flags & DRM_SYNCOBJ_HANDLE_TO_FD_FLAGS_EXPORT_SYNC_FILE) |
| return drm_syncobj_export_sync_file(file_private, args->handle, |
| &args->fd); |
| |
| return drm_syncobj_handle_to_fd(file_private, args->handle, |
| &args->fd); |
| } |
| |
| int |
| drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_handle *args = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad) |
| return -EINVAL; |
| |
| if (args->flags != 0 && |
| args->flags != DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) |
| return -EINVAL; |
| |
| if (args->flags & DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE) |
| return drm_syncobj_import_sync_file_fence(file_private, |
| args->fd, |
| args->handle); |
| |
| return drm_syncobj_fd_to_handle(file_private, args->fd, |
| &args->handle); |
| } |
| |
| static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private, |
| struct drm_syncobj_transfer *args) |
| { |
| struct drm_syncobj *timeline_syncobj = NULL; |
| struct dma_fence *fence; |
| struct dma_fence_chain *chain; |
| int ret; |
| |
| timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle); |
| if (!timeline_syncobj) { |
| return -ENOENT; |
| } |
| ret = drm_syncobj_find_fence(file_private, args->src_handle, |
| args->src_point, args->flags, |
| &fence); |
| if (ret) |
| goto err; |
| chain = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL); |
| if (!chain) { |
| ret = -ENOMEM; |
| goto err1; |
| } |
| drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point); |
| err1: |
| dma_fence_put(fence); |
| err: |
| drm_syncobj_put(timeline_syncobj); |
| |
| return ret; |
| } |
| |
| static int |
| drm_syncobj_transfer_to_binary(struct drm_file *file_private, |
| struct drm_syncobj_transfer *args) |
| { |
| struct drm_syncobj *binary_syncobj = NULL; |
| struct dma_fence *fence; |
| int ret; |
| |
| binary_syncobj = drm_syncobj_find(file_private, args->dst_handle); |
| if (!binary_syncobj) |
| return -ENOENT; |
| ret = drm_syncobj_find_fence(file_private, args->src_handle, |
| args->src_point, args->flags, &fence); |
| if (ret) |
| goto err; |
| drm_syncobj_replace_fence(binary_syncobj, fence); |
| dma_fence_put(fence); |
| err: |
| drm_syncobj_put(binary_syncobj); |
| |
| return ret; |
| } |
| int |
| drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_transfer *args = data; |
| int ret; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad) |
| return -EINVAL; |
| |
| if (args->dst_point) |
| ret = drm_syncobj_transfer_to_timeline(file_private, args); |
| else |
| ret = drm_syncobj_transfer_to_binary(file_private, args); |
| |
| return ret; |
| } |
| |
| static void syncobj_wait_fence_func(struct dma_fence *fence, |
| struct dma_fence_cb *cb) |
| { |
| struct syncobj_wait_entry *wait = |
| container_of(cb, struct syncobj_wait_entry, fence_cb); |
| |
| wake_up_process(wait->task); |
| } |
| |
| static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj, |
| struct syncobj_wait_entry *wait) |
| { |
| struct dma_fence *fence; |
| |
| /* This happens inside the syncobj lock */ |
| fence = rcu_dereference_protected(syncobj->fence, |
| lockdep_is_held(&syncobj->lock)); |
| dma_fence_get(fence); |
| if (!fence || dma_fence_chain_find_seqno(&fence, wait->point)) { |
| dma_fence_put(fence); |
| return; |
| } else if (!fence) { |
| wait->fence = dma_fence_get_stub(); |
| } else { |
| wait->fence = fence; |
| } |
| |
| wake_up_process(wait->task); |
| list_del_init(&wait->node); |
| } |
| |
| static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs, |
| void __user *user_points, |
| uint32_t count, |
| uint32_t flags, |
| signed long timeout, |
| uint32_t *idx) |
| { |
| struct syncobj_wait_entry *entries; |
| struct dma_fence *fence; |
| uint64_t *points; |
| uint32_t signaled_count, i; |
| |
| points = kmalloc_array(count, sizeof(*points), GFP_KERNEL); |
| if (points == NULL) |
| return -ENOMEM; |
| |
| if (!user_points) { |
| memset(points, 0, count * sizeof(uint64_t)); |
| |
| } else if (copy_from_user(points, user_points, |
| sizeof(uint64_t) * count)) { |
| timeout = -EFAULT; |
| goto err_free_points; |
| } |
| |
| entries = kcalloc(count, sizeof(*entries), GFP_KERNEL); |
| if (!entries) { |
| timeout = -ENOMEM; |
| goto err_free_points; |
| } |
| /* Walk the list of sync objects and initialize entries. We do |
| * this up-front so that we can properly return -EINVAL if there is |
| * a syncobj with a missing fence and then never have the chance of |
| * returning -EINVAL again. |
| */ |
| signaled_count = 0; |
| for (i = 0; i < count; ++i) { |
| struct dma_fence *fence; |
| |
| entries[i].task = current; |
| entries[i].point = points[i]; |
| fence = drm_syncobj_fence_get(syncobjs[i]); |
| if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) { |
| dma_fence_put(fence); |
| if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) { |
| continue; |
| } else { |
| timeout = -EINVAL; |
| goto cleanup_entries; |
| } |
| } |
| |
| if (fence) |
| entries[i].fence = fence; |
| else |
| entries[i].fence = dma_fence_get_stub(); |
| |
| if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) || |
| dma_fence_is_signaled(entries[i].fence)) { |
| if (signaled_count == 0 && idx) |
| *idx = i; |
| signaled_count++; |
| } |
| } |
| |
| if (signaled_count == count || |
| (signaled_count > 0 && |
| !(flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL))) |
| goto cleanup_entries; |
| |
| /* There's a very annoying laxness in the dma_fence API here, in |
| * that backends are not required to automatically report when a |
| * fence is signaled prior to fence->ops->enable_signaling() being |
| * called. So here if we fail to match signaled_count, we need to |
| * fallthough and try a 0 timeout wait! |
| */ |
| |
| if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) { |
| for (i = 0; i < count; ++i) |
| drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]); |
| } |
| |
| do { |
| set_current_state(TASK_INTERRUPTIBLE); |
| |
| signaled_count = 0; |
| for (i = 0; i < count; ++i) { |
| fence = entries[i].fence; |
| if (!fence) |
| continue; |
| |
| if ((flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE) || |
| dma_fence_is_signaled(fence) || |
| (!entries[i].fence_cb.func && |
| dma_fence_add_callback(fence, |
| &entries[i].fence_cb, |
| syncobj_wait_fence_func))) { |
| /* The fence has been signaled */ |
| if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL) { |
| signaled_count++; |
| } else { |
| if (idx) |
| *idx = i; |
| goto done_waiting; |
| } |
| } |
| } |
| |
| if (signaled_count == count) |
| goto done_waiting; |
| |
| if (timeout == 0) { |
| timeout = -ETIME; |
| goto done_waiting; |
| } |
| |
| if (signal_pending(current)) { |
| timeout = -ERESTARTSYS; |
| goto done_waiting; |
| } |
| |
| timeout = schedule_timeout(timeout); |
| } while (1); |
| |
| done_waiting: |
| __set_current_state(TASK_RUNNING); |
| |
| cleanup_entries: |
| for (i = 0; i < count; ++i) { |
| drm_syncobj_remove_wait(syncobjs[i], &entries[i]); |
| if (entries[i].fence_cb.func) |
| dma_fence_remove_callback(entries[i].fence, |
| &entries[i].fence_cb); |
| dma_fence_put(entries[i].fence); |
| } |
| kfree(entries); |
| |
| err_free_points: |
| kfree(points); |
| |
| return timeout; |
| } |
| |
| /** |
| * drm_timeout_abs_to_jiffies - calculate jiffies timeout from absolute value |
| * |
| * @timeout_nsec: timeout nsec component in ns, 0 for poll |
| * |
| * Calculate the timeout in jiffies from an absolute time in sec/nsec. |
| */ |
| signed long drm_timeout_abs_to_jiffies(int64_t timeout_nsec) |
| { |
| ktime_t abs_timeout, now; |
| u64 timeout_ns, timeout_jiffies64; |
| |
| /* make 0 timeout means poll - absolute 0 doesn't seem valid */ |
| if (timeout_nsec == 0) |
| return 0; |
| |
| abs_timeout = ns_to_ktime(timeout_nsec); |
| now = ktime_get(); |
| |
| if (!ktime_after(abs_timeout, now)) |
| return 0; |
| |
| timeout_ns = ktime_to_ns(ktime_sub(abs_timeout, now)); |
| |
| timeout_jiffies64 = nsecs_to_jiffies64(timeout_ns); |
| /* clamp timeout to avoid infinite timeout */ |
| if (timeout_jiffies64 >= MAX_SCHEDULE_TIMEOUT - 1) |
| return MAX_SCHEDULE_TIMEOUT - 1; |
| |
| return timeout_jiffies64 + 1; |
| } |
| EXPORT_SYMBOL(drm_timeout_abs_to_jiffies); |
| |
| static int drm_syncobj_array_wait(struct drm_device *dev, |
| struct drm_file *file_private, |
| struct drm_syncobj_wait *wait, |
| struct drm_syncobj_timeline_wait *timeline_wait, |
| struct drm_syncobj **syncobjs, bool timeline) |
| { |
| signed long timeout = 0; |
| uint32_t first = ~0; |
| |
| if (!timeline) { |
| timeout = drm_timeout_abs_to_jiffies(wait->timeout_nsec); |
| timeout = drm_syncobj_array_wait_timeout(syncobjs, |
| NULL, |
| wait->count_handles, |
| wait->flags, |
| timeout, &first); |
| if (timeout < 0) |
| return timeout; |
| wait->first_signaled = first; |
| } else { |
| timeout = drm_timeout_abs_to_jiffies(timeline_wait->timeout_nsec); |
| timeout = drm_syncobj_array_wait_timeout(syncobjs, |
| u64_to_user_ptr(timeline_wait->points), |
| timeline_wait->count_handles, |
| timeline_wait->flags, |
| timeout, &first); |
| if (timeout < 0) |
| return timeout; |
| timeline_wait->first_signaled = first; |
| } |
| return 0; |
| } |
| |
| static int drm_syncobj_array_find(struct drm_file *file_private, |
| void __user *user_handles, |
| uint32_t count_handles, |
| struct drm_syncobj ***syncobjs_out) |
| { |
| uint32_t i, *handles; |
| struct drm_syncobj **syncobjs; |
| int ret; |
| |
| handles = kmalloc_array(count_handles, sizeof(*handles), GFP_KERNEL); |
| if (handles == NULL) |
| return -ENOMEM; |
| |
| if (copy_from_user(handles, user_handles, |
| sizeof(uint32_t) * count_handles)) { |
| ret = -EFAULT; |
| goto err_free_handles; |
| } |
| |
| syncobjs = kmalloc_array(count_handles, sizeof(*syncobjs), GFP_KERNEL); |
| if (syncobjs == NULL) { |
| ret = -ENOMEM; |
| goto err_free_handles; |
| } |
| |
| for (i = 0; i < count_handles; i++) { |
| syncobjs[i] = drm_syncobj_find(file_private, handles[i]); |
| if (!syncobjs[i]) { |
| ret = -ENOENT; |
| goto err_put_syncobjs; |
| } |
| } |
| |
| kfree(handles); |
| *syncobjs_out = syncobjs; |
| return 0; |
| |
| err_put_syncobjs: |
| while (i-- > 0) |
| drm_syncobj_put(syncobjs[i]); |
| kfree(syncobjs); |
| err_free_handles: |
| kfree(handles); |
| |
| return ret; |
| } |
| |
| static void drm_syncobj_array_free(struct drm_syncobj **syncobjs, |
| uint32_t count) |
| { |
| uint32_t i; |
| for (i = 0; i < count; i++) |
| drm_syncobj_put(syncobjs[i]); |
| kfree(syncobjs); |
| } |
| |
| int |
| drm_syncobj_wait_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_wait *args = data; |
| struct drm_syncobj **syncobjs; |
| int ret = 0; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL | |
| DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT)) |
| return -EINVAL; |
| |
| if (args->count_handles == 0) |
| return -EINVAL; |
| |
| ret = drm_syncobj_array_find(file_private, |
| u64_to_user_ptr(args->handles), |
| args->count_handles, |
| &syncobjs); |
| if (ret < 0) |
| return ret; |
| |
| ret = drm_syncobj_array_wait(dev, file_private, |
| args, NULL, syncobjs, false); |
| |
| drm_syncobj_array_free(syncobjs, args->count_handles); |
| |
| return ret; |
| } |
| |
| int |
| drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_timeline_wait *args = data; |
| struct drm_syncobj **syncobjs; |
| int ret = 0; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) |
| return -EOPNOTSUPP; |
| |
| if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL | |
| DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT | |
| DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) |
| return -EINVAL; |
| |
| if (args->count_handles == 0) |
| return -EINVAL; |
| |
| ret = drm_syncobj_array_find(file_private, |
| u64_to_user_ptr(args->handles), |
| args->count_handles, |
| &syncobjs); |
| if (ret < 0) |
| return ret; |
| |
| ret = drm_syncobj_array_wait(dev, file_private, |
| NULL, args, syncobjs, true); |
| |
| drm_syncobj_array_free(syncobjs, args->count_handles); |
| |
| return ret; |
| } |
| |
| |
| int |
| drm_syncobj_reset_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_array *args = data; |
| struct drm_syncobj **syncobjs; |
| uint32_t i; |
| int ret; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad != 0) |
| return -EINVAL; |
| |
| if (args->count_handles == 0) |
| return -EINVAL; |
| |
| ret = drm_syncobj_array_find(file_private, |
| u64_to_user_ptr(args->handles), |
| args->count_handles, |
| &syncobjs); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < args->count_handles; i++) |
| drm_syncobj_replace_fence(syncobjs[i], NULL); |
| |
| drm_syncobj_array_free(syncobjs, args->count_handles); |
| |
| return 0; |
| } |
| |
| int |
| drm_syncobj_signal_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_array *args = data; |
| struct drm_syncobj **syncobjs; |
| uint32_t i; |
| int ret; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad != 0) |
| return -EINVAL; |
| |
| if (args->count_handles == 0) |
| return -EINVAL; |
| |
| ret = drm_syncobj_array_find(file_private, |
| u64_to_user_ptr(args->handles), |
| args->count_handles, |
| &syncobjs); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < args->count_handles; i++) |
| drm_syncobj_assign_null_handle(syncobjs[i]); |
| |
| drm_syncobj_array_free(syncobjs, args->count_handles); |
| |
| return ret; |
| } |
| |
| int |
| drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_timeline_array *args = data; |
| struct drm_syncobj **syncobjs; |
| struct dma_fence_chain **chains; |
| uint64_t *points; |
| uint32_t i, j; |
| int ret; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad != 0) |
| return -EINVAL; |
| |
| if (args->count_handles == 0) |
| return -EINVAL; |
| |
| ret = drm_syncobj_array_find(file_private, |
| u64_to_user_ptr(args->handles), |
| args->count_handles, |
| &syncobjs); |
| if (ret < 0) |
| return ret; |
| |
| points = kmalloc_array(args->count_handles, sizeof(*points), |
| GFP_KERNEL); |
| if (!points) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| if (!u64_to_user_ptr(args->points)) { |
| memset(points, 0, args->count_handles * sizeof(uint64_t)); |
| } else if (copy_from_user(points, u64_to_user_ptr(args->points), |
| sizeof(uint64_t) * args->count_handles)) { |
| ret = -EFAULT; |
| goto err_points; |
| } |
| |
| chains = kmalloc_array(args->count_handles, sizeof(void *), GFP_KERNEL); |
| if (!chains) { |
| ret = -ENOMEM; |
| goto err_points; |
| } |
| for (i = 0; i < args->count_handles; i++) { |
| chains[i] = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL); |
| if (!chains[i]) { |
| for (j = 0; j < i; j++) |
| kfree(chains[j]); |
| ret = -ENOMEM; |
| goto err_chains; |
| } |
| } |
| |
| for (i = 0; i < args->count_handles; i++) { |
| struct dma_fence *fence = dma_fence_get_stub(); |
| |
| drm_syncobj_add_point(syncobjs[i], chains[i], |
| fence, points[i]); |
| dma_fence_put(fence); |
| } |
| err_chains: |
| kfree(chains); |
| err_points: |
| kfree(points); |
| out: |
| drm_syncobj_array_free(syncobjs, args->count_handles); |
| |
| return ret; |
| } |
| |
| int drm_syncobj_query_ioctl(struct drm_device *dev, void *data, |
| struct drm_file *file_private) |
| { |
| struct drm_syncobj_timeline_array *args = data; |
| struct drm_syncobj **syncobjs; |
| uint64_t __user *points = u64_to_user_ptr(args->points); |
| uint32_t i; |
| int ret; |
| |
| if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) |
| return -EOPNOTSUPP; |
| |
| if (args->pad != 0) |
| return -EINVAL; |
| |
| if (args->count_handles == 0) |
| return -EINVAL; |
| |
| ret = drm_syncobj_array_find(file_private, |
| u64_to_user_ptr(args->handles), |
| args->count_handles, |
| &syncobjs); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < args->count_handles; i++) { |
| struct dma_fence_chain *chain; |
| struct dma_fence *fence; |
| uint64_t point; |
| |
| fence = drm_syncobj_fence_get(syncobjs[i]); |
| chain = to_dma_fence_chain(fence); |
| if (chain) { |
| struct dma_fence *iter, *last_signaled = NULL; |
| |
| dma_fence_chain_for_each(iter, fence) { |
| if (iter->context != fence->context) { |
| dma_fence_put(iter); |
| /* It is most likely that timeline has |
| * unorder points. */ |
| break; |
| } |
| dma_fence_put(last_signaled); |
| last_signaled = dma_fence_get(iter); |
| } |
| point = dma_fence_is_signaled(last_signaled) ? |
| last_signaled->seqno : |
| to_dma_fence_chain(last_signaled)->prev_seqno; |
| dma_fence_put(last_signaled); |
| } else { |
| point = 0; |
| } |
| ret = copy_to_user(&points[i], &point, sizeof(uint64_t)); |
| ret = ret ? -EFAULT : 0; |
| if (ret) |
| break; |
| } |
| drm_syncobj_array_free(syncobjs, args->count_handles); |
| |
| return ret; |
| } |