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         uint64_t *cpu_addr;
  40         int i, r;
  41
  42         *semaphore = kmalloc(sizeof(struct radeon_semaphore), M_DRM,
  43                              M_WAITOK);
  44         if (*semaphore == NULL) {
  45                 return -ENOMEM;
  46         }
  47         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, &(*semaphore)->sa_bo,
  48                              8 * RADEON_NUM_SYNCS, 8);
  49         if (r) {
  50                 kfree(*semaphore);
  51                 *semaphore = NULL;
  52                 return r;
  53         }
  54         (*semaphore)->waiters = 0;
  55         (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
  56
  57         cpu_addr = radeon_sa_bo_cpu_addr((*semaphore)->sa_bo);
  58         for (i = 0; i < RADEON_NUM_SYNCS; ++i)
  59                 cpu_addr[i] = 0;
  60
  61         for (i = 0; i < RADEON_NUM_RINGS; ++i)
  62                 (*semaphore)->sync_to[i] = NULL;
  63
  64         return 0;
  65 }
  66
  67 bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
  68                                   struct radeon_semaphore *semaphore)
  69 {
  70         struct radeon_ring *ring = &rdev->ring[ridx];
  71
  72 #ifdef TRACE_TODO
  73         trace_radeon_semaphore_signale(ridx, semaphore);
  74 #endif
  75
  76         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
  77                 --semaphore->waiters;
  78
  79                 /* for debugging lockup only, used by sysfs debug files */
  80                 ring->last_semaphore_signal_addr = semaphore->gpu_addr;
  81                 return true;
  82         }
  83         return false;
  84 }
  85
  86 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
  87                                 struct radeon_semaphore *semaphore)
  88 {
  89         struct radeon_ring *ring = &rdev->ring[ridx];
  90
  91 #ifdef TRACE_TODO
  92         trace_radeon_semaphore_wait(ridx, semaphore);
  93 #endif
  94
  95         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
  96                 ++semaphore->waiters;
  97
  98                 /* for debugging lockup only, used by sysfs debug files */
  99                 ring->last_semaphore_wait_addr = semaphore->gpu_addr;
 100                 return true;
 101         }
 102         return false;
 103 }
 104
 105 /**
 106  * radeon_semaphore_sync_to - use the semaphore to sync to a fence
 107  *
 108  * @semaphore: semaphore object to add fence to
 109  * @fence: fence to sync to
 110  *
 111  * Sync to the fence using this semaphore object
 112  */
 113 void radeon_semaphore_sync_to(struct radeon_semaphore *semaphore,
 114                               struct radeon_fence *fence)
 115 {
 116         struct radeon_fence *other;
 117
 118         if (!fence)
 119                 return;
 120
 121         other = semaphore->sync_to[fence->ring];
 122         semaphore->sync_to[fence->ring] = radeon_fence_later(fence, other);
 123 }
 124
 125 /**
 126  * radeon_semaphore_sync_rings - sync ring to all registered fences
 127  *
 128  * @rdev: radeon_device pointer
 129  * @semaphore: semaphore object to use for sync
 130  * @ring: ring that needs sync
 131  *
 132  * Ensure that all registered fences are signaled before letting
 133  * the ring continue. The caller must hold the ring lock.
 134  */
 135 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
 136                                 struct radeon_semaphore *semaphore,
 137                                 int ring)
 138 {
 139         unsigned count = 0;
 140         int i, r;
 141
 142         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 143                 struct radeon_fence *fence = semaphore->sync_to[i];
 144
 145                 /* check if we really need to sync */
 146                 if (!radeon_fence_need_sync(fence, ring))
 147                         continue;
 148
 149                 /* prevent GPU deadlocks */
 150                 if (!rdev->ring[i].ready) {
 151                         dev_err(rdev->dev, "Syncing to a disabled ring!");
 152                         return -EINVAL;
 153                 }
 154
 155                 if (++count > RADEON_NUM_SYNCS) {
 156                         /* not enough room, wait manually */
 157                         r = radeon_fence_wait(fence, false);
 158                         if (r)
 159                                 return r;
 160                         continue;
 161                 }
 162
 163                 /* allocate enough space for sync command */
 164                 r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
 165                 if (r) {
 166                         return r;
 167                 }
 168
 169                 /* emit the signal semaphore */
 170                 if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
 171                         /* signaling wasn't successful wait manually */
 172                         radeon_ring_undo(&rdev->ring[i]);
 173                         r = radeon_fence_wait(fence, false);
 174                         if (r)
 175                                 return r;
 176                         continue;
 177                 }
 178
 179                 /* we assume caller has already allocated space on waiters ring */
 180                 if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
 181                         /* waiting wasn't successful wait manually */
 182                         radeon_ring_undo(&rdev->ring[i]);
 183                         r = radeon_fence_wait(fence, false);
 184                         if (r)
 185                                 return r;
 186                         continue;
 187                 }
 188
 189                 radeon_ring_commit(rdev, &rdev->ring[i], false);
 190                 radeon_fence_note_sync(fence, ring);
 191
 192                 semaphore->gpu_addr += 8;
 193         }
 194
 195         return 0;
 196 }
 197
 198 void radeon_semaphore_free(struct radeon_device *rdev,
 199                            struct radeon_semaphore **semaphore,
 200                            struct radeon_fence *fence)
 201 {
 202         if (semaphore == NULL || *semaphore == NULL) {
 203                 return;
 204         }
 205         if ((*semaphore)->waiters > 0) {
 206                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 207                         " hardware lockup imminent!\n", *semaphore);
 208         }
 209         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 210         kfree(*semaphore);
 211         *semaphore = NULL;
 212 }