1935774cdSBrian Starkey // SPDX-License-Identifier: GPL-2.0 2935774cdSBrian Starkey /* 3935774cdSBrian Starkey * (C) COPYRIGHT 2016 ARM Limited. All rights reserved. 4935774cdSBrian Starkey * Author: Brian Starkey <brian.starkey@arm.com> 5935774cdSBrian Starkey * 6935774cdSBrian Starkey * This program is free software and is provided to you under the terms of the 7935774cdSBrian Starkey * GNU General Public License version 2 as published by the Free Software 8935774cdSBrian Starkey * Foundation, and any use by you of this program is subject to the terms 9935774cdSBrian Starkey * of such GNU licence. 10935774cdSBrian Starkey */ 11935774cdSBrian Starkey 12*0500c04eSSam Ravnborg #include <linux/dma-fence.h> 13*0500c04eSSam Ravnborg 14935774cdSBrian Starkey #include <drm/drm_crtc.h> 15*0500c04eSSam Ravnborg #include <drm/drm_device.h> 16*0500c04eSSam Ravnborg #include <drm/drm_drv.h> 17935774cdSBrian Starkey #include <drm/drm_modeset_helper_vtables.h> 18935774cdSBrian Starkey #include <drm/drm_property.h> 19935774cdSBrian Starkey #include <drm/drm_writeback.h> 20935774cdSBrian Starkey 21935774cdSBrian Starkey /** 22935774cdSBrian Starkey * DOC: overview 23935774cdSBrian Starkey * 24935774cdSBrian Starkey * Writeback connectors are used to expose hardware which can write the output 25935774cdSBrian Starkey * from a CRTC to a memory buffer. They are used and act similarly to other 26935774cdSBrian Starkey * types of connectors, with some important differences: 2773915b2bSBoris Brezillon * 2873915b2bSBoris Brezillon * * Writeback connectors don't provide a way to output visually to the user. 2973915b2bSBoris Brezillon * 3071a5cb3eSAlexandru Gheorghe * * Writeback connectors are visible to userspace only when the client sets 3171a5cb3eSAlexandru Gheorghe * DRM_CLIENT_CAP_WRITEBACK_CONNECTORS. 3273915b2bSBoris Brezillon * 3373915b2bSBoris Brezillon * * Writeback connectors don't have EDID. 34935774cdSBrian Starkey * 35935774cdSBrian Starkey * A framebuffer may only be attached to a writeback connector when the 36935774cdSBrian Starkey * connector is attached to a CRTC. The WRITEBACK_FB_ID property which sets the 37935774cdSBrian Starkey * framebuffer applies only to a single commit (see below). A framebuffer may 38935774cdSBrian Starkey * not be attached while the CRTC is off. 39935774cdSBrian Starkey * 40b13cc8ddSBrian Starkey * Unlike with planes, when a writeback framebuffer is removed by userspace DRM 41b13cc8ddSBrian Starkey * makes no attempt to remove it from active use by the connector. This is 42b13cc8ddSBrian Starkey * because no method is provided to abort a writeback operation, and in any 43b13cc8ddSBrian Starkey * case making a new commit whilst a writeback is ongoing is undefined (see 44b13cc8ddSBrian Starkey * WRITEBACK_OUT_FENCE_PTR below). As soon as the current writeback is finished, 45b13cc8ddSBrian Starkey * the framebuffer will automatically no longer be in active use. As it will 46b13cc8ddSBrian Starkey * also have already been removed from the framebuffer list, there will be no 47b13cc8ddSBrian Starkey * way for any userspace application to retrieve a reference to it in the 48b13cc8ddSBrian Starkey * intervening period. 49b13cc8ddSBrian Starkey * 50935774cdSBrian Starkey * Writeback connectors have some additional properties, which userspace 51935774cdSBrian Starkey * can use to query and control them: 52935774cdSBrian Starkey * 53935774cdSBrian Starkey * "WRITEBACK_FB_ID": 54935774cdSBrian Starkey * Write-only object property storing a DRM_MODE_OBJECT_FB: it stores the 55935774cdSBrian Starkey * framebuffer to be written by the writeback connector. This property is 56935774cdSBrian Starkey * similar to the FB_ID property on planes, but will always read as zero 57935774cdSBrian Starkey * and is not preserved across commits. 58935774cdSBrian Starkey * Userspace must set this property to an output buffer every time it 59935774cdSBrian Starkey * wishes the buffer to get filled. 60935774cdSBrian Starkey * 61935774cdSBrian Starkey * "WRITEBACK_PIXEL_FORMATS": 62935774cdSBrian Starkey * Immutable blob property to store the supported pixel formats table. The 63935774cdSBrian Starkey * data is an array of u32 DRM_FORMAT_* fourcc values. 64935774cdSBrian Starkey * Userspace can use this blob to find out what pixel formats are supported 65935774cdSBrian Starkey * by the connector's writeback engine. 66b13cc8ddSBrian Starkey * 67b13cc8ddSBrian Starkey * "WRITEBACK_OUT_FENCE_PTR": 68b13cc8ddSBrian Starkey * Userspace can use this property to provide a pointer for the kernel to 69b13cc8ddSBrian Starkey * fill with a sync_file file descriptor, which will signal once the 70b13cc8ddSBrian Starkey * writeback is finished. The value should be the address of a 32-bit 71b13cc8ddSBrian Starkey * signed integer, cast to a u64. 72b13cc8ddSBrian Starkey * Userspace should wait for this fence to signal before making another 73b13cc8ddSBrian Starkey * commit affecting any of the same CRTCs, Planes or Connectors. 74b13cc8ddSBrian Starkey * **Failure to do so will result in undefined behaviour.** 75b13cc8ddSBrian Starkey * For this reason it is strongly recommended that all userspace 76b13cc8ddSBrian Starkey * applications making use of writeback connectors *always* retrieve an 77b13cc8ddSBrian Starkey * out-fence for the commit and use it appropriately. 78b13cc8ddSBrian Starkey * From userspace, this property will always read as zero. 79935774cdSBrian Starkey */ 80935774cdSBrian Starkey 81b13cc8ddSBrian Starkey #define fence_to_wb_connector(x) container_of(x->lock, \ 82b13cc8ddSBrian Starkey struct drm_writeback_connector, \ 83b13cc8ddSBrian Starkey fence_lock) 84b13cc8ddSBrian Starkey 85b13cc8ddSBrian Starkey static const char *drm_writeback_fence_get_driver_name(struct dma_fence *fence) 86b13cc8ddSBrian Starkey { 87b13cc8ddSBrian Starkey struct drm_writeback_connector *wb_connector = 88b13cc8ddSBrian Starkey fence_to_wb_connector(fence); 89b13cc8ddSBrian Starkey 90b13cc8ddSBrian Starkey return wb_connector->base.dev->driver->name; 91b13cc8ddSBrian Starkey } 92b13cc8ddSBrian Starkey 93b13cc8ddSBrian Starkey static const char * 94b13cc8ddSBrian Starkey drm_writeback_fence_get_timeline_name(struct dma_fence *fence) 95b13cc8ddSBrian Starkey { 96b13cc8ddSBrian Starkey struct drm_writeback_connector *wb_connector = 97b13cc8ddSBrian Starkey fence_to_wb_connector(fence); 98b13cc8ddSBrian Starkey 99b13cc8ddSBrian Starkey return wb_connector->timeline_name; 100b13cc8ddSBrian Starkey } 101b13cc8ddSBrian Starkey 102b13cc8ddSBrian Starkey static bool drm_writeback_fence_enable_signaling(struct dma_fence *fence) 103b13cc8ddSBrian Starkey { 104b13cc8ddSBrian Starkey return true; 105b13cc8ddSBrian Starkey } 106b13cc8ddSBrian Starkey 107b13cc8ddSBrian Starkey static const struct dma_fence_ops drm_writeback_fence_ops = { 108b13cc8ddSBrian Starkey .get_driver_name = drm_writeback_fence_get_driver_name, 109b13cc8ddSBrian Starkey .get_timeline_name = drm_writeback_fence_get_timeline_name, 110b13cc8ddSBrian Starkey .enable_signaling = drm_writeback_fence_enable_signaling, 111b13cc8ddSBrian Starkey .wait = dma_fence_default_wait, 112b13cc8ddSBrian Starkey }; 113b13cc8ddSBrian Starkey 114935774cdSBrian Starkey static int create_writeback_properties(struct drm_device *dev) 115935774cdSBrian Starkey { 116935774cdSBrian Starkey struct drm_property *prop; 117935774cdSBrian Starkey 118935774cdSBrian Starkey if (!dev->mode_config.writeback_fb_id_property) { 119935774cdSBrian Starkey prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC, 120935774cdSBrian Starkey "WRITEBACK_FB_ID", 121935774cdSBrian Starkey DRM_MODE_OBJECT_FB); 122935774cdSBrian Starkey if (!prop) 123935774cdSBrian Starkey return -ENOMEM; 124935774cdSBrian Starkey dev->mode_config.writeback_fb_id_property = prop; 125935774cdSBrian Starkey } 126935774cdSBrian Starkey 127935774cdSBrian Starkey if (!dev->mode_config.writeback_pixel_formats_property) { 128935774cdSBrian Starkey prop = drm_property_create(dev, DRM_MODE_PROP_BLOB | 129935774cdSBrian Starkey DRM_MODE_PROP_ATOMIC | 130935774cdSBrian Starkey DRM_MODE_PROP_IMMUTABLE, 131935774cdSBrian Starkey "WRITEBACK_PIXEL_FORMATS", 0); 132935774cdSBrian Starkey if (!prop) 133935774cdSBrian Starkey return -ENOMEM; 134935774cdSBrian Starkey dev->mode_config.writeback_pixel_formats_property = prop; 135935774cdSBrian Starkey } 136935774cdSBrian Starkey 137b13cc8ddSBrian Starkey if (!dev->mode_config.writeback_out_fence_ptr_property) { 138b13cc8ddSBrian Starkey prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC, 139b13cc8ddSBrian Starkey "WRITEBACK_OUT_FENCE_PTR", 0, 140b13cc8ddSBrian Starkey U64_MAX); 141b13cc8ddSBrian Starkey if (!prop) 142b13cc8ddSBrian Starkey return -ENOMEM; 143b13cc8ddSBrian Starkey dev->mode_config.writeback_out_fence_ptr_property = prop; 144b13cc8ddSBrian Starkey } 145b13cc8ddSBrian Starkey 146935774cdSBrian Starkey return 0; 147935774cdSBrian Starkey } 148935774cdSBrian Starkey 149935774cdSBrian Starkey static const struct drm_encoder_funcs drm_writeback_encoder_funcs = { 150935774cdSBrian Starkey .destroy = drm_encoder_cleanup, 151935774cdSBrian Starkey }; 152935774cdSBrian Starkey 153935774cdSBrian Starkey /** 154935774cdSBrian Starkey * drm_writeback_connector_init - Initialize a writeback connector and its properties 155935774cdSBrian Starkey * @dev: DRM device 156935774cdSBrian Starkey * @wb_connector: Writeback connector to initialize 157935774cdSBrian Starkey * @con_funcs: Connector funcs vtable 158935774cdSBrian Starkey * @enc_helper_funcs: Encoder helper funcs vtable to be used by the internal encoder 159935774cdSBrian Starkey * @formats: Array of supported pixel formats for the writeback engine 160935774cdSBrian Starkey * @n_formats: Length of the formats array 161935774cdSBrian Starkey * 162935774cdSBrian Starkey * This function creates the writeback-connector-specific properties if they 163935774cdSBrian Starkey * have not been already created, initializes the connector as 164935774cdSBrian Starkey * type DRM_MODE_CONNECTOR_WRITEBACK, and correctly initializes the property 165935774cdSBrian Starkey * values. It will also create an internal encoder associated with the 166935774cdSBrian Starkey * drm_writeback_connector and set it to use the @enc_helper_funcs vtable for 167935774cdSBrian Starkey * the encoder helper. 168935774cdSBrian Starkey * 169935774cdSBrian Starkey * Drivers should always use this function instead of drm_connector_init() to 170935774cdSBrian Starkey * set up writeback connectors. 171935774cdSBrian Starkey * 172935774cdSBrian Starkey * Returns: 0 on success, or a negative error code 173935774cdSBrian Starkey */ 174935774cdSBrian Starkey int drm_writeback_connector_init(struct drm_device *dev, 175935774cdSBrian Starkey struct drm_writeback_connector *wb_connector, 176935774cdSBrian Starkey const struct drm_connector_funcs *con_funcs, 177935774cdSBrian Starkey const struct drm_encoder_helper_funcs *enc_helper_funcs, 178935774cdSBrian Starkey const u32 *formats, int n_formats) 179935774cdSBrian Starkey { 180935774cdSBrian Starkey struct drm_property_blob *blob; 181935774cdSBrian Starkey struct drm_connector *connector = &wb_connector->base; 182935774cdSBrian Starkey struct drm_mode_config *config = &dev->mode_config; 183935774cdSBrian Starkey int ret = create_writeback_properties(dev); 184935774cdSBrian Starkey 185935774cdSBrian Starkey if (ret != 0) 186935774cdSBrian Starkey return ret; 187935774cdSBrian Starkey 188935774cdSBrian Starkey blob = drm_property_create_blob(dev, n_formats * sizeof(*formats), 189935774cdSBrian Starkey formats); 190935774cdSBrian Starkey if (IS_ERR(blob)) 191935774cdSBrian Starkey return PTR_ERR(blob); 192935774cdSBrian Starkey 193935774cdSBrian Starkey drm_encoder_helper_add(&wb_connector->encoder, enc_helper_funcs); 194935774cdSBrian Starkey ret = drm_encoder_init(dev, &wb_connector->encoder, 195935774cdSBrian Starkey &drm_writeback_encoder_funcs, 196935774cdSBrian Starkey DRM_MODE_ENCODER_VIRTUAL, NULL); 197935774cdSBrian Starkey if (ret) 198935774cdSBrian Starkey goto fail; 199935774cdSBrian Starkey 200935774cdSBrian Starkey connector->interlace_allowed = 0; 201935774cdSBrian Starkey 202935774cdSBrian Starkey ret = drm_connector_init(dev, connector, con_funcs, 203935774cdSBrian Starkey DRM_MODE_CONNECTOR_WRITEBACK); 204935774cdSBrian Starkey if (ret) 205935774cdSBrian Starkey goto connector_fail; 206935774cdSBrian Starkey 207cde4c44dSDaniel Vetter ret = drm_connector_attach_encoder(connector, 208935774cdSBrian Starkey &wb_connector->encoder); 209935774cdSBrian Starkey if (ret) 210935774cdSBrian Starkey goto attach_fail; 211935774cdSBrian Starkey 212935774cdSBrian Starkey INIT_LIST_HEAD(&wb_connector->job_queue); 213935774cdSBrian Starkey spin_lock_init(&wb_connector->job_lock); 214935774cdSBrian Starkey 215b13cc8ddSBrian Starkey wb_connector->fence_context = dma_fence_context_alloc(1); 216b13cc8ddSBrian Starkey spin_lock_init(&wb_connector->fence_lock); 217b13cc8ddSBrian Starkey snprintf(wb_connector->timeline_name, 218b13cc8ddSBrian Starkey sizeof(wb_connector->timeline_name), 219b13cc8ddSBrian Starkey "CONNECTOR:%d-%s", connector->base.id, connector->name); 220b13cc8ddSBrian Starkey 221b13cc8ddSBrian Starkey drm_object_attach_property(&connector->base, 222b13cc8ddSBrian Starkey config->writeback_out_fence_ptr_property, 0); 223b13cc8ddSBrian Starkey 224935774cdSBrian Starkey drm_object_attach_property(&connector->base, 225935774cdSBrian Starkey config->writeback_fb_id_property, 0); 226935774cdSBrian Starkey 227935774cdSBrian Starkey drm_object_attach_property(&connector->base, 228935774cdSBrian Starkey config->writeback_pixel_formats_property, 229935774cdSBrian Starkey blob->base.id); 230935774cdSBrian Starkey wb_connector->pixel_formats_blob_ptr = blob; 231935774cdSBrian Starkey 232935774cdSBrian Starkey return 0; 233935774cdSBrian Starkey 234935774cdSBrian Starkey attach_fail: 235935774cdSBrian Starkey drm_connector_cleanup(connector); 236935774cdSBrian Starkey connector_fail: 237935774cdSBrian Starkey drm_encoder_cleanup(&wb_connector->encoder); 238935774cdSBrian Starkey fail: 239935774cdSBrian Starkey drm_property_blob_put(blob); 240935774cdSBrian Starkey return ret; 241935774cdSBrian Starkey } 242935774cdSBrian Starkey EXPORT_SYMBOL(drm_writeback_connector_init); 243935774cdSBrian Starkey 2449d2230dcSLaurent Pinchart int drm_writeback_set_fb(struct drm_connector_state *conn_state, 2459d2230dcSLaurent Pinchart struct drm_framebuffer *fb) 2469d2230dcSLaurent Pinchart { 2479d2230dcSLaurent Pinchart WARN_ON(conn_state->connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK); 2489d2230dcSLaurent Pinchart 2499d2230dcSLaurent Pinchart if (!conn_state->writeback_job) { 2509d2230dcSLaurent Pinchart conn_state->writeback_job = 2519d2230dcSLaurent Pinchart kzalloc(sizeof(*conn_state->writeback_job), GFP_KERNEL); 2529d2230dcSLaurent Pinchart if (!conn_state->writeback_job) 2539d2230dcSLaurent Pinchart return -ENOMEM; 2549d2230dcSLaurent Pinchart 2559d2230dcSLaurent Pinchart conn_state->writeback_job->connector = 2569d2230dcSLaurent Pinchart drm_connector_to_writeback(conn_state->connector); 2579d2230dcSLaurent Pinchart } 2589d2230dcSLaurent Pinchart 2599d2230dcSLaurent Pinchart drm_framebuffer_assign(&conn_state->writeback_job->fb, fb); 2609d2230dcSLaurent Pinchart return 0; 2619d2230dcSLaurent Pinchart } 2629d2230dcSLaurent Pinchart 2639d2230dcSLaurent Pinchart int drm_writeback_prepare_job(struct drm_writeback_job *job) 2649d2230dcSLaurent Pinchart { 2659d2230dcSLaurent Pinchart struct drm_writeback_connector *connector = job->connector; 2669d2230dcSLaurent Pinchart const struct drm_connector_helper_funcs *funcs = 2679d2230dcSLaurent Pinchart connector->base.helper_private; 2689d2230dcSLaurent Pinchart int ret; 2699d2230dcSLaurent Pinchart 2709d2230dcSLaurent Pinchart if (funcs->prepare_writeback_job) { 2719d2230dcSLaurent Pinchart ret = funcs->prepare_writeback_job(connector, job); 2729d2230dcSLaurent Pinchart if (ret < 0) 2739d2230dcSLaurent Pinchart return ret; 2749d2230dcSLaurent Pinchart } 2759d2230dcSLaurent Pinchart 2769d2230dcSLaurent Pinchart job->prepared = true; 2779d2230dcSLaurent Pinchart return 0; 2789d2230dcSLaurent Pinchart } 2799d2230dcSLaurent Pinchart EXPORT_SYMBOL(drm_writeback_prepare_job); 2809d2230dcSLaurent Pinchart 281935774cdSBrian Starkey /** 282935774cdSBrian Starkey * drm_writeback_queue_job - Queue a writeback job for later signalling 283935774cdSBrian Starkey * @wb_connector: The writeback connector to queue a job on 28497eb9eaeSLaurent Pinchart * @conn_state: The connector state containing the job to queue 285935774cdSBrian Starkey * 28697eb9eaeSLaurent Pinchart * This function adds the job contained in @conn_state to the job_queue for a 28797eb9eaeSLaurent Pinchart * writeback connector. It takes ownership of the writeback job and sets the 28897eb9eaeSLaurent Pinchart * @conn_state->writeback_job to NULL, and so no access to the job may be 28997eb9eaeSLaurent Pinchart * performed by the caller after this function returns. 290935774cdSBrian Starkey * 291935774cdSBrian Starkey * Drivers must ensure that for a given writeback connector, jobs are queued in 292935774cdSBrian Starkey * exactly the same order as they will be completed by the hardware (and 293935774cdSBrian Starkey * signaled via drm_writeback_signal_completion). 294935774cdSBrian Starkey * 295935774cdSBrian Starkey * For every call to drm_writeback_queue_job() there must be exactly one call to 296935774cdSBrian Starkey * drm_writeback_signal_completion() 297935774cdSBrian Starkey * 298935774cdSBrian Starkey * See also: drm_writeback_signal_completion() 299935774cdSBrian Starkey */ 300935774cdSBrian Starkey void drm_writeback_queue_job(struct drm_writeback_connector *wb_connector, 30197eb9eaeSLaurent Pinchart struct drm_connector_state *conn_state) 302935774cdSBrian Starkey { 30397eb9eaeSLaurent Pinchart struct drm_writeback_job *job; 304935774cdSBrian Starkey unsigned long flags; 305935774cdSBrian Starkey 30697eb9eaeSLaurent Pinchart job = conn_state->writeback_job; 30797eb9eaeSLaurent Pinchart conn_state->writeback_job = NULL; 30897eb9eaeSLaurent Pinchart 309935774cdSBrian Starkey spin_lock_irqsave(&wb_connector->job_lock, flags); 310935774cdSBrian Starkey list_add_tail(&job->list_entry, &wb_connector->job_queue); 311935774cdSBrian Starkey spin_unlock_irqrestore(&wb_connector->job_lock, flags); 312935774cdSBrian Starkey } 313935774cdSBrian Starkey EXPORT_SYMBOL(drm_writeback_queue_job); 314935774cdSBrian Starkey 315e482ae9bSLaurent Pinchart void drm_writeback_cleanup_job(struct drm_writeback_job *job) 316e482ae9bSLaurent Pinchart { 3179d2230dcSLaurent Pinchart struct drm_writeback_connector *connector = job->connector; 3189d2230dcSLaurent Pinchart const struct drm_connector_helper_funcs *funcs = 3199d2230dcSLaurent Pinchart connector->base.helper_private; 3209d2230dcSLaurent Pinchart 3219d2230dcSLaurent Pinchart if (job->prepared && funcs->cleanup_writeback_job) 3229d2230dcSLaurent Pinchart funcs->cleanup_writeback_job(connector, job); 3239d2230dcSLaurent Pinchart 324e482ae9bSLaurent Pinchart if (job->fb) 325e482ae9bSLaurent Pinchart drm_framebuffer_put(job->fb); 326e482ae9bSLaurent Pinchart 327e482ae9bSLaurent Pinchart kfree(job); 328e482ae9bSLaurent Pinchart } 329e482ae9bSLaurent Pinchart EXPORT_SYMBOL(drm_writeback_cleanup_job); 330e482ae9bSLaurent Pinchart 331935774cdSBrian Starkey /* 332935774cdSBrian Starkey * @cleanup_work: deferred cleanup of a writeback job 333935774cdSBrian Starkey * 334935774cdSBrian Starkey * The job cannot be cleaned up directly in drm_writeback_signal_completion, 335935774cdSBrian Starkey * because it may be called in interrupt context. Dropping the framebuffer 336935774cdSBrian Starkey * reference can sleep, and so the cleanup is deferred to a workqueue. 337935774cdSBrian Starkey */ 338935774cdSBrian Starkey static void cleanup_work(struct work_struct *work) 339935774cdSBrian Starkey { 340935774cdSBrian Starkey struct drm_writeback_job *job = container_of(work, 341935774cdSBrian Starkey struct drm_writeback_job, 342935774cdSBrian Starkey cleanup_work); 343935774cdSBrian Starkey 344e482ae9bSLaurent Pinchart drm_writeback_cleanup_job(job); 345e482ae9bSLaurent Pinchart } 346935774cdSBrian Starkey 347935774cdSBrian Starkey /** 348935774cdSBrian Starkey * drm_writeback_signal_completion - Signal the completion of a writeback job 349935774cdSBrian Starkey * @wb_connector: The writeback connector whose job is complete 350b13cc8ddSBrian Starkey * @status: Status code to set in the writeback out_fence (0 for success) 351935774cdSBrian Starkey * 352935774cdSBrian Starkey * Drivers should call this to signal the completion of a previously queued 353935774cdSBrian Starkey * writeback job. It should be called as soon as possible after the hardware 354935774cdSBrian Starkey * has finished writing, and may be called from interrupt context. 355935774cdSBrian Starkey * It is the driver's responsibility to ensure that for a given connector, the 356935774cdSBrian Starkey * hardware completes writeback jobs in the same order as they are queued. 357935774cdSBrian Starkey * 358935774cdSBrian Starkey * Unless the driver is holding its own reference to the framebuffer, it must 359935774cdSBrian Starkey * not be accessed after calling this function. 360935774cdSBrian Starkey * 361935774cdSBrian Starkey * See also: drm_writeback_queue_job() 362935774cdSBrian Starkey */ 363935774cdSBrian Starkey void 364b13cc8ddSBrian Starkey drm_writeback_signal_completion(struct drm_writeback_connector *wb_connector, 365b13cc8ddSBrian Starkey int status) 366935774cdSBrian Starkey { 367935774cdSBrian Starkey unsigned long flags; 368935774cdSBrian Starkey struct drm_writeback_job *job; 369935774cdSBrian Starkey 370935774cdSBrian Starkey spin_lock_irqsave(&wb_connector->job_lock, flags); 371935774cdSBrian Starkey job = list_first_entry_or_null(&wb_connector->job_queue, 372935774cdSBrian Starkey struct drm_writeback_job, 373935774cdSBrian Starkey list_entry); 374b13cc8ddSBrian Starkey if (job) { 375935774cdSBrian Starkey list_del(&job->list_entry); 376b13cc8ddSBrian Starkey if (job->out_fence) { 377b13cc8ddSBrian Starkey if (status) 378b13cc8ddSBrian Starkey dma_fence_set_error(job->out_fence, status); 379b13cc8ddSBrian Starkey dma_fence_signal(job->out_fence); 380b13cc8ddSBrian Starkey dma_fence_put(job->out_fence); 381b13cc8ddSBrian Starkey } 382b13cc8ddSBrian Starkey } 383935774cdSBrian Starkey spin_unlock_irqrestore(&wb_connector->job_lock, flags); 384935774cdSBrian Starkey 385935774cdSBrian Starkey if (WARN_ON(!job)) 386935774cdSBrian Starkey return; 387935774cdSBrian Starkey 388935774cdSBrian Starkey INIT_WORK(&job->cleanup_work, cleanup_work); 389935774cdSBrian Starkey queue_work(system_long_wq, &job->cleanup_work); 390935774cdSBrian Starkey } 391935774cdSBrian Starkey EXPORT_SYMBOL(drm_writeback_signal_completion); 392b13cc8ddSBrian Starkey 393b13cc8ddSBrian Starkey struct dma_fence * 394b13cc8ddSBrian Starkey drm_writeback_get_out_fence(struct drm_writeback_connector *wb_connector) 395b13cc8ddSBrian Starkey { 396b13cc8ddSBrian Starkey struct dma_fence *fence; 397b13cc8ddSBrian Starkey 398b13cc8ddSBrian Starkey if (WARN_ON(wb_connector->base.connector_type != 399b13cc8ddSBrian Starkey DRM_MODE_CONNECTOR_WRITEBACK)) 400b13cc8ddSBrian Starkey return NULL; 401b13cc8ddSBrian Starkey 402b13cc8ddSBrian Starkey fence = kzalloc(sizeof(*fence), GFP_KERNEL); 403b13cc8ddSBrian Starkey if (!fence) 404b13cc8ddSBrian Starkey return NULL; 405b13cc8ddSBrian Starkey 406b13cc8ddSBrian Starkey dma_fence_init(fence, &drm_writeback_fence_ops, 407b13cc8ddSBrian Starkey &wb_connector->fence_lock, wb_connector->fence_context, 408b13cc8ddSBrian Starkey ++wb_connector->fence_seqno); 409b13cc8ddSBrian Starkey 410b13cc8ddSBrian Starkey return fence; 411b13cc8ddSBrian Starkey } 412b13cc8ddSBrian Starkey EXPORT_SYMBOL(drm_writeback_get_out_fence); 413