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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. #include "radeon_trace.h"
  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);
  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.  
  53.         *((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
  54.  
  55.         return 0;
  56. }
  57.  
  58. bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
  59.                                   struct radeon_semaphore *semaphore)
  60. {
  61.         struct radeon_ring *ring = &rdev->ring[ridx];
  62.  
  63.         trace_radeon_semaphore_signale(ridx, semaphore);
  64.  
  65.         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
  66.                 --semaphore->waiters;
  67.  
  68.                 /* for debugging lockup only, used by sysfs debug files */
  69.                 ring->last_semaphore_signal_addr = semaphore->gpu_addr;
  70.                 return true;
  71.         }
  72.         return false;
  73. }
  74.  
  75. bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
  76.                                 struct radeon_semaphore *semaphore)
  77. {
  78.         struct radeon_ring *ring = &rdev->ring[ridx];
  79.  
  80.         trace_radeon_semaphore_wait(ridx, semaphore);
  81.  
  82.         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
  83.                 ++semaphore->waiters;
  84.  
  85.                 /* for debugging lockup only, used by sysfs debug files */
  86.                 ring->last_semaphore_wait_addr = semaphore->gpu_addr;
  87.                 return true;
  88.         }
  89.         return false;
  90. }
  91.  
  92. void radeon_semaphore_free(struct radeon_device *rdev,
  93.                            struct radeon_semaphore **semaphore,
  94.                            struct radeon_fence *fence)
  95. {
  96.         if (semaphore == NULL || *semaphore == NULL) {
  97.                 return;
  98.         }
  99.         if ((*semaphore)->waiters > 0) {
  100.                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
  101.                         " hardware lockup imminent!\n", *semaphore);
  102.         }
  103.         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
  104.         kfree(*semaphore);
  105.         *semaphore = NULL;
  106. }
  107.