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  1. /*
  2.  * Copyright 2011 Christian König.
  3.  * All Rights Reserved.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the
  7.  * "Software"), to deal in the Software without restriction, including
  8.  * without limitation the rights to use, copy, modify, merge, publish,
  9.  * distribute, sub license, and/or sell copies of the Software, and to
  10.  * permit persons to whom the Software is furnished to do so, subject to
  11.  * the following conditions:
  12.  *
  13.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20.  *
  21.  * The above copyright notice and this permission notice (including the
  22.  * next paragraph) shall be included in all copies or substantial portions
  23.  * of the Software.
  24.  *
  25.  */
  26. /*
  27.  * Authors:
  28.  *    Christian König <deathsimple@vodafone.de>
  29.  */
  30. #include <drm/drmP.h>
  31. #include "radeon.h"
  32.  
  33.  
  34. int radeon_semaphore_create(struct radeon_device *rdev,
  35.                             struct radeon_semaphore **semaphore)
  36. {
  37.         int r;
  38.  
  39.         *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
  40.         if (*semaphore == NULL) {
  41.                 return -ENOMEM;
  42.         }
  43.         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
  44.                              &(*semaphore)->sa_bo, 8, 8, true);
  45.         if (r) {
  46.                 kfree(*semaphore);
  47.                 *semaphore = NULL;
  48.                 return r;
  49.         }
  50.         (*semaphore)->waiters = 0;
  51.         (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
  52.         *((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
  53.         return 0;
  54. }
  55.  
  56. void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
  57.                                   struct radeon_semaphore *semaphore)
  58. {
  59.         --semaphore->waiters;
  60.         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
  61. }
  62.  
  63. void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
  64.                                 struct radeon_semaphore *semaphore)
  65. {
  66.         ++semaphore->waiters;
  67.         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
  68. }
  69.  
  70. /* caller must hold ring lock */
  71. int radeon_semaphore_sync_rings(struct radeon_device *rdev,
  72.                                 struct radeon_semaphore *semaphore,
  73.                                 int signaler, int waiter)
  74. {
  75.         int r;
  76.  
  77.         /* no need to signal and wait on the same ring */
  78.         if (signaler == waiter) {
  79.                 return 0;
  80.         }
  81.  
  82.         /* prevent GPU deadlocks */
  83.         if (!rdev->ring[signaler].ready) {
  84.                 dev_err(rdev->dev, "Trying to sync to a disabled ring!");
  85.                 return -EINVAL;
  86.         }
  87.  
  88.         r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
  89.         if (r) {
  90.                 return r;
  91.         }
  92.         radeon_semaphore_emit_signal(rdev, signaler, semaphore);
  93.         radeon_ring_commit(rdev, &rdev->ring[signaler]);
  94.  
  95.         /* we assume caller has already allocated space on waiters ring */
  96.         radeon_semaphore_emit_wait(rdev, waiter, semaphore);
  97.  
  98.         return 0;
  99. }
  100.  
  101. void radeon_semaphore_free(struct radeon_device *rdev,
  102.                            struct radeon_semaphore **semaphore,
  103.                            struct radeon_fence *fence)
  104. {
  105.         if (semaphore == NULL || *semaphore == NULL) {
  106.                 return;
  107.         }
  108.         if ((*semaphore)->waiters > 0) {
  109.                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
  110.                         " hardware lockup imminent!\n", *semaphore);
  111.         }
  112.         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
  113.         kfree(*semaphore);
  114.         *semaphore = NULL;
  115. }
  116.