drivers/gpu/drm/i915/selftests/lib_sw_fence.c

   1 /*
   2  * Copyright © 2017 Intel Corporation
   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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include "lib_sw_fence.h"
  26
  27 /* Small library of different fence types useful for writing tests */
  28
  29 static int __i915_sw_fence_call
  30 nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
  31 {
  32         return NOTIFY_DONE;
  33 }
  34
  35 void __onstack_fence_init(struct i915_sw_fence *fence,
  36                           const char *name,
  37                           struct lock_class_key *key)
  38 {
  39         debug_fence_init_onstack(fence);
  40
  41         __init_waitqueue_head(&fence->wait, name, key);
  42         atomic_set(&fence->pending, 1);
  43         fence->flags = (unsigned long)nop_fence_notify;
  44 }
  45
  46 void onstack_fence_fini(struct i915_sw_fence *fence)
  47 {
  48         i915_sw_fence_commit(fence);
  49         i915_sw_fence_fini(fence);
  50 }
  51
  52 static void timed_fence_wake(struct timer_list *t)
  53 {
  54         struct timed_fence *tf = from_timer(tf, t, timer);
  55
  56         i915_sw_fence_commit(&tf->fence);
  57 }
  58
  59 void timed_fence_init(struct timed_fence *tf, unsigned long expires)
  60 {
  61         onstack_fence_init(&tf->fence);
  62
  63         timer_setup_on_stack(&tf->timer, timed_fence_wake, 0);
  64
  65         if (time_after(expires, jiffies))
  66                 mod_timer(&tf->timer, expires);
  67         else
  68                 i915_sw_fence_commit(&tf->fence);
  69 }
  70
  71 void timed_fence_fini(struct timed_fence *tf)
  72 {
  73         if (del_timer_sync(&tf->timer))
  74                 i915_sw_fence_commit(&tf->fence);
  75
  76         destroy_timer_on_stack(&tf->timer);
  77         i915_sw_fence_fini(&tf->fence);
  78 }