LXR linux/drivers/gpu/drm/i915/selftests/lib_sw

   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
  29static int __i915_sw_fence_call
  30nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
  31{
  32        return NOTIFY_DONE;
  33}
  34
  35void __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
  46void onstack_fence_fini(struct i915_sw_fence *fence)
  47{
  48        i915_sw_fence_commit(fence);
  49        i915_sw_fence_fini(fence);
  50}
  51
  52static 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
  59void 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
  71void 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}
  79