sys/dev/drm/radeon/radeon_semaphore.c

   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 #ifdef TRACE_TODO
  33 #include "radeon_trace.h"
  34 #endif
  35
  36 int radeon_semaphore_create(struct radeon_device *rdev,
  37                             struct radeon_semaphore **semaphore)
  38 {
  39         int r;
  40
  41         *semaphore = kmalloc(sizeof(struct radeon_semaphore), M_DRM, GFP_KERNEL);
  42         if (*semaphore == NULL) {
  43                 return -ENOMEM;
  44         }
  45         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
  46                              &(*semaphore)->sa_bo, 8, 8);
  47         if (r) {
  48                 kfree(*semaphore);
  49                 *semaphore = NULL;
  50                 return r;
  51         }
  52         (*semaphore)->waiters = 0;
  53         (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
  54
  55         *((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
  56
  57         return 0;
  58 }
  59
  60 bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
  61                                   struct radeon_semaphore *semaphore)
  62 {
  63         struct radeon_ring *ring = &rdev->ring[ridx];
  64
  65 #ifdef TRACE_TODO
  66         trace_radeon_semaphore_signale(ridx, semaphore);
  67 #endif
  68
  69         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
  70                 --semaphore->waiters;
  71
  72                 /* for debugging lockup only, used by sysfs debug files */
  73                 ring->last_semaphore_signal_addr = semaphore->gpu_addr;
  74                 return true;
  75         }
  76         return false;
  77 }
  78
  79 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
  80                                 struct radeon_semaphore *semaphore)
  81 {
  82         struct radeon_ring *ring = &rdev->ring[ridx];
  83
  84 #ifdef TRACE_TODO
  85         trace_radeon_semaphore_wait(ridx, semaphore);
  86 #endif
  87
  88         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
  89                 ++semaphore->waiters;
  90
  91                 /* for debugging lockup only, used by sysfs debug files */
  92                 ring->last_semaphore_wait_addr = semaphore->gpu_addr;
  93                 return true;
  94         }
  95         return false;
  96 }
  97
  98 void radeon_semaphore_free(struct radeon_device *rdev,
  99                            struct radeon_semaphore **semaphore,
 100                            struct radeon_fence *fence)
 101 {
 102         if (semaphore == NULL || *semaphore == NULL) {
 103                 return;
 104         }
 105         if ((*semaphore)->waiters > 0) {
 106                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 107                         " hardware lockup imminent!\n", *semaphore);
 108         }
 109         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 110         kfree(*semaphore);
 111         *semaphore = NULL;
 112 }