drivers/gpu/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 #include "radeon_trace.h"
  33
  34 int radeon_semaphore_create(struct radeon_device *rdev,
  35                             struct radeon_semaphore **semaphore)
  36 {
  37         int i, 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
  54         for (i = 0; i < RADEON_NUM_RINGS; ++i)
  55                 (*semaphore)->sync_to[i] = NULL;
  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         trace_radeon_semaphore_signale(ridx, semaphore);
  66
  67         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
  68                 --semaphore->waiters;
  69
  70                 /* for debugging lockup only, used by sysfs debug files */
  71                 ring->last_semaphore_signal_addr = semaphore->gpu_addr;
  72                 return true;
  73         }
  74         return false;
  75 }
  76
  77 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
  78                                 struct radeon_semaphore *semaphore)
  79 {
  80         struct radeon_ring *ring = &rdev->ring[ridx];
  81
  82         trace_radeon_semaphore_wait(ridx, semaphore);
  83
  84         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
  85                 ++semaphore->waiters;
  86
  87                 /* for debugging lockup only, used by sysfs debug files */
  88                 ring->last_semaphore_wait_addr = semaphore->gpu_addr;
  89                 return true;
  90         }
  91         return false;
  92 }
  93
  94 /**
  95  * radeon_semaphore_sync_to - use the semaphore to sync to a fence
  96  *
  97  * @semaphore: semaphore object to add fence to
  98  * @fence: fence to sync to
  99  *
 100  * Sync to the fence using this semaphore object
 101  */
 102 void radeon_semaphore_sync_to(struct radeon_semaphore *semaphore,
 103                               struct radeon_fence *fence)
 104 {
 105         struct radeon_fence *other;
 106
 107         if (!fence)
 108                 return;
 109
 110         other = semaphore->sync_to[fence->ring];
 111         semaphore->sync_to[fence->ring] = radeon_fence_later(fence, other);
 112 }
 113
 114 /**
 115  * radeon_semaphore_sync_rings - sync ring to all registered fences
 116  *
 117  * @rdev: radeon_device pointer
 118  * @semaphore: semaphore object to use for sync
 119  * @ring: ring that needs sync
 120  *
 121  * Ensure that all registered fences are signaled before letting
 122  * the ring continue. The caller must hold the ring lock.
 123  */
 124 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
 125                                 struct radeon_semaphore *semaphore,
 126                                 int ring)
 127 {
 128         int i, r;
 129
 130         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 131                 struct radeon_fence *fence = semaphore->sync_to[i];
 132
 133                 /* check if we really need to sync */
 134                 if (!radeon_fence_need_sync(fence, ring))
 135                         continue;
 136
 137                 /* prevent GPU deadlocks */
 138                 if (!rdev->ring[i].ready) {
 139                         dev_err(rdev->dev, "Syncing to a disabled ring!");
 140                         return -EINVAL;
 141                 }
 142
 143                 /* allocate enough space for sync command */
 144                 r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
 145                 if (r) {
 146                         return r;
 147                 }
 148
 149                 /* emit the signal semaphore */
 150                 if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
 151                         /* signaling wasn't successful wait manually */
 152                         radeon_ring_undo(&rdev->ring[i]);
 153                         radeon_fence_wait_locked(fence);
 154                         continue;
 155                 }
 156
 157                 /* we assume caller has already allocated space on waiters ring */
 158                 if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
 159                         /* waiting wasn't successful wait manually */
 160                         radeon_ring_undo(&rdev->ring[i]);
 161                         radeon_fence_wait_locked(fence);
 162                         continue;
 163                 }
 164
 165                 radeon_ring_commit(rdev, &rdev->ring[i]);
 166                 radeon_fence_note_sync(fence, ring);
 167         }
 168
 169         return 0;
 170 }
 171
 172 void radeon_semaphore_free(struct radeon_device *rdev,
 173                            struct radeon_semaphore **semaphore,
 174                            struct radeon_fence *fence)
 175 {
 176         if (semaphore == NULL || *semaphore == NULL) {
 177                 return;
 178         }
 179         if ((*semaphore)->waiters > 0) {
 180                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 181                         " hardware lockup imminent!\n", *semaphore);
 182         }
 183         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 184         kfree(*semaphore);
 185         *semaphore = NULL;
 186 }