LCOV - code coverage report
Current view: top level - drivers/gpu/drm - drm_flip_work.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 55 0.0 %
Date: 2022-03-28 16:04:14 Functions: 0 7 0.0 %
Branches: 0 22 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (C) 2013 Red Hat
       3                 :            :  *
       4                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a
       5                 :            :  * copy of this software and associated documentation files (the "Software"),
       6                 :            :  * to deal in the Software without restriction, including without limitation
       7                 :            :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
       8                 :            :  * and/or sell copies of the Software, and to permit persons to whom the
       9                 :            :  * Software is furnished to do so, subject to the following conditions:
      10                 :            :  *
      11                 :            :  * The above copyright notice and this permission notice (including the next
      12                 :            :  * paragraph) shall be included in all copies or substantial portions of the
      13                 :            :  * Software.
      14                 :            :  *
      15                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      16                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      17                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
      18                 :            :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      19                 :            :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      20                 :            :  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
      21                 :            :  * SOFTWARE.
      22                 :            :  */
      23                 :            : 
      24                 :            : #include <linux/slab.h>
      25                 :            : 
      26                 :            : #include <drm/drm_flip_work.h>
      27                 :            : #include <drm/drm_print.h>
      28                 :            : #include <drm/drm_util.h>
      29                 :            : 
      30                 :            : /**
      31                 :            :  * drm_flip_work_allocate_task - allocate a flip-work task
      32                 :            :  * @data: data associated to the task
      33                 :            :  * @flags: allocator flags
      34                 :            :  *
      35                 :            :  * Allocate a drm_flip_task object and attach private data to it.
      36                 :            :  */
      37                 :          0 : struct drm_flip_task *drm_flip_work_allocate_task(void *data, gfp_t flags)
      38                 :            : {
      39                 :          0 :         struct drm_flip_task *task;
      40                 :            : 
      41                 :          0 :         task = kzalloc(sizeof(*task), flags);
      42   [ #  #  #  # ]:          0 :         if (task)
      43                 :          0 :                 task->data = data;
      44                 :            : 
      45                 :          0 :         return task;
      46                 :            : }
      47                 :            : EXPORT_SYMBOL(drm_flip_work_allocate_task);
      48                 :            : 
      49                 :            : /**
      50                 :            :  * drm_flip_work_queue_task - queue a specific task
      51                 :            :  * @work: the flip-work
      52                 :            :  * @task: the task to handle
      53                 :            :  *
      54                 :            :  * Queues task, that will later be run (passed back to drm_flip_func_t
      55                 :            :  * func) on a work queue after drm_flip_work_commit() is called.
      56                 :            :  */
      57                 :          0 : void drm_flip_work_queue_task(struct drm_flip_work *work,
      58                 :            :                               struct drm_flip_task *task)
      59                 :            : {
      60                 :          0 :         unsigned long flags;
      61                 :            : 
      62                 :          0 :         spin_lock_irqsave(&work->lock, flags);
      63                 :          0 :         list_add_tail(&task->node, &work->queued);
      64                 :          0 :         spin_unlock_irqrestore(&work->lock, flags);
      65                 :          0 : }
      66                 :            : EXPORT_SYMBOL(drm_flip_work_queue_task);
      67                 :            : 
      68                 :            : /**
      69                 :            :  * drm_flip_work_queue - queue work
      70                 :            :  * @work: the flip-work
      71                 :            :  * @val: the value to queue
      72                 :            :  *
      73                 :            :  * Queues work, that will later be run (passed back to drm_flip_func_t
      74                 :            :  * func) on a work queue after drm_flip_work_commit() is called.
      75                 :            :  */
      76                 :          0 : void drm_flip_work_queue(struct drm_flip_work *work, void *val)
      77                 :            : {
      78                 :          0 :         struct drm_flip_task *task;
      79                 :            : 
      80         [ #  # ]:          0 :         task = drm_flip_work_allocate_task(val,
      81                 :            :                                 drm_can_sleep() ? GFP_KERNEL : GFP_ATOMIC);
      82         [ #  # ]:          0 :         if (task) {
      83                 :          0 :                 drm_flip_work_queue_task(work, task);
      84                 :            :         } else {
      85                 :          0 :                 DRM_ERROR("%s could not allocate task!\n", work->name);
      86                 :          0 :                 work->func(work, val);
      87                 :            :         }
      88                 :          0 : }
      89                 :            : EXPORT_SYMBOL(drm_flip_work_queue);
      90                 :            : 
      91                 :            : /**
      92                 :            :  * drm_flip_work_commit - commit queued work
      93                 :            :  * @work: the flip-work
      94                 :            :  * @wq: the work-queue to run the queued work on
      95                 :            :  *
      96                 :            :  * Trigger work previously queued by drm_flip_work_queue() to run
      97                 :            :  * on a workqueue.  The typical usage would be to queue work (via
      98                 :            :  * drm_flip_work_queue()) at any point (from vblank irq and/or
      99                 :            :  * prior), and then from vblank irq commit the queued work.
     100                 :            :  */
     101                 :          0 : void drm_flip_work_commit(struct drm_flip_work *work,
     102                 :            :                 struct workqueue_struct *wq)
     103                 :            : {
     104                 :          0 :         unsigned long flags;
     105                 :            : 
     106                 :          0 :         spin_lock_irqsave(&work->lock, flags);
     107         [ #  # ]:          0 :         list_splice_tail(&work->queued, &work->commited);
     108                 :          0 :         INIT_LIST_HEAD(&work->queued);
     109                 :          0 :         spin_unlock_irqrestore(&work->lock, flags);
     110                 :          0 :         queue_work(wq, &work->worker);
     111                 :          0 : }
     112                 :            : EXPORT_SYMBOL(drm_flip_work_commit);
     113                 :            : 
     114                 :          0 : static void flip_worker(struct work_struct *w)
     115                 :            : {
     116                 :          0 :         struct drm_flip_work *work = container_of(w, struct drm_flip_work, worker);
     117                 :          0 :         struct list_head tasks;
     118                 :          0 :         unsigned long flags;
     119                 :            : 
     120                 :          0 :         while (1) {
     121                 :          0 :                 struct drm_flip_task *task, *tmp;
     122                 :            : 
     123                 :          0 :                 INIT_LIST_HEAD(&tasks);
     124                 :          0 :                 spin_lock_irqsave(&work->lock, flags);
     125         [ #  # ]:          0 :                 list_splice_tail(&work->commited, &tasks);
     126                 :          0 :                 INIT_LIST_HEAD(&work->commited);
     127                 :          0 :                 spin_unlock_irqrestore(&work->lock, flags);
     128                 :            : 
     129         [ #  # ]:          0 :                 if (list_empty(&tasks))
     130                 :            :                         break;
     131                 :            : 
     132         [ #  # ]:          0 :                 list_for_each_entry_safe(task, tmp, &tasks, node) {
     133                 :          0 :                         work->func(work, task->data);
     134                 :          0 :                         kfree(task);
     135                 :            :                 }
     136                 :            :         }
     137                 :          0 : }
     138                 :            : 
     139                 :            : /**
     140                 :            :  * drm_flip_work_init - initialize flip-work
     141                 :            :  * @work: the flip-work to initialize
     142                 :            :  * @name: debug name
     143                 :            :  * @func: the callback work function
     144                 :            :  *
     145                 :            :  * Initializes/allocates resources for the flip-work
     146                 :            :  */
     147                 :          0 : void drm_flip_work_init(struct drm_flip_work *work,
     148                 :            :                 const char *name, drm_flip_func_t func)
     149                 :            : {
     150                 :          0 :         work->name = name;
     151                 :          0 :         INIT_LIST_HEAD(&work->queued);
     152                 :          0 :         INIT_LIST_HEAD(&work->commited);
     153                 :          0 :         spin_lock_init(&work->lock);
     154                 :          0 :         work->func = func;
     155                 :            : 
     156                 :          0 :         INIT_WORK(&work->worker, flip_worker);
     157                 :          0 : }
     158                 :            : EXPORT_SYMBOL(drm_flip_work_init);
     159                 :            : 
     160                 :            : /**
     161                 :            :  * drm_flip_work_cleanup - cleans up flip-work
     162                 :            :  * @work: the flip-work to cleanup
     163                 :            :  *
     164                 :            :  * Destroy resources allocated for the flip-work
     165                 :            :  */
     166                 :          0 : void drm_flip_work_cleanup(struct drm_flip_work *work)
     167                 :            : {
     168   [ #  #  #  #  :          0 :         WARN_ON(!list_empty(&work->queued) || !list_empty(&work->commited));
                   #  # ]
     169                 :          0 : }
     170                 :            : EXPORT_SYMBOL(drm_flip_work_cleanup);

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