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       1                 :            : // SPDX-License-Identifier: GPL-2.0-only
       2                 :            : /*
       3                 :            :  * seqno-fence, using a dma-buf to synchronize fencing
       4                 :            :  *
       5                 :            :  * Copyright (C) 2012 Texas Instruments
       6                 :            :  * Copyright (C) 2012-2014 Canonical Ltd
       7                 :            :  * Authors:
       8                 :            :  *   Rob Clark <robdclark@gmail.com>
       9                 :            :  *   Maarten Lankhorst <maarten.lankhorst@canonical.com>
      10                 :            :  */
      11                 :            : 
      12                 :            : #include <linux/slab.h>
      13                 :            : #include <linux/export.h>
      14                 :            : #include <linux/seqno-fence.h>
      15                 :            : 
      16                 :          0 : static const char *seqno_fence_get_driver_name(struct dma_fence *fence)
      17                 :            : {
      18                 :            :         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
      19                 :            : 
      20                 :          0 :         return seqno_fence->ops->get_driver_name(fence);
      21                 :            : }
      22                 :            : 
      23                 :          0 : static const char *seqno_fence_get_timeline_name(struct dma_fence *fence)
      24                 :            : {
      25                 :            :         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
      26                 :            : 
      27                 :          0 :         return seqno_fence->ops->get_timeline_name(fence);
      28                 :            : }
      29                 :            : 
      30                 :          0 : static bool seqno_enable_signaling(struct dma_fence *fence)
      31                 :            : {
      32                 :            :         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
      33                 :            : 
      34                 :          0 :         return seqno_fence->ops->enable_signaling(fence);
      35                 :            : }
      36                 :            : 
      37                 :          0 : static bool seqno_signaled(struct dma_fence *fence)
      38                 :            : {
      39                 :            :         struct seqno_fence *seqno_fence = to_seqno_fence(fence);
      40                 :            : 
      41   [ #  #  #  # ]:          0 :         return seqno_fence->ops->signaled && seqno_fence->ops->signaled(fence);
      42                 :            : }
      43                 :            : 
      44         [ #  # ]:          0 : static void seqno_release(struct dma_fence *fence)
      45                 :            : {
      46                 :            :         struct seqno_fence *f = to_seqno_fence(fence);
      47                 :            : 
      48                 :          0 :         dma_buf_put(f->sync_buf);
      49         [ #  # ]:          0 :         if (f->ops->release)
      50                 :          0 :                 f->ops->release(fence);
      51                 :            :         else
      52                 :          0 :                 dma_fence_free(&f->base);
      53                 :          0 : }
      54                 :            : 
      55                 :          0 : static signed long seqno_wait(struct dma_fence *fence, bool intr,
      56                 :            :                               signed long timeout)
      57                 :            : {
      58                 :            :         struct seqno_fence *f = to_seqno_fence(fence);
      59                 :            : 
      60                 :          0 :         return f->ops->wait(fence, intr, timeout);
      61                 :            : }
      62                 :            : 
      63                 :            : const struct dma_fence_ops seqno_fence_ops = {
      64                 :            :         .get_driver_name = seqno_fence_get_driver_name,
      65                 :            :         .get_timeline_name = seqno_fence_get_timeline_name,
      66                 :            :         .enable_signaling = seqno_enable_signaling,
      67                 :            :         .signaled = seqno_signaled,
      68                 :            :         .wait = seqno_wait,
      69                 :            :         .release = seqno_release,
      70                 :            : };
      71                 :            : EXPORT_SYMBOL(seqno_fence_ops);