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         uint32_t *cpu_addr;
  38         int i, r;
  39
  40         *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
  41         if (*semaphore == NULL) {
  42                 return -ENOMEM;
  43         }
  44         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, &(*semaphore)->sa_bo,
  45                              8 * RADEON_NUM_SYNCS, 8, true);
  46         if (r) {
  47                 kfree(*semaphore);
  48                 *semaphore = NULL;
  49                 return r;
  50         }
  51         (*semaphore)->waiters = 0;
  52         (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
  53
  54         cpu_addr = radeon_sa_bo_cpu_addr((*semaphore)->sa_bo);
  55         for (i = 0; i < RADEON_NUM_SYNCS; ++i)
  56                 cpu_addr[i] = 0;
  57
  58         for (i = 0; i < RADEON_NUM_RINGS; ++i)
  59                 (*semaphore)->sync_to[i] = NULL;
  60
  61         return 0;
  62 }
  63
  64 bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
  65                                   struct radeon_semaphore *semaphore)
  66 {
  67         struct radeon_ring *ring = &rdev->ring[ridx];
  68
  69         trace_radeon_semaphore_signale(ridx, semaphore);
  70
  71         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
  72                 --semaphore->waiters;
  73
  74                 /* for debugging lockup only, used by sysfs debug files */
  75                 ring->last_semaphore_signal_addr = semaphore->gpu_addr;
  76                 return true;
  77         }
  78         return false;
  79 }
  80
  81 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
  82                                 struct radeon_semaphore *semaphore)
  83 {
  84         struct radeon_ring *ring = &rdev->ring[ridx];
  85
  86         trace_radeon_semaphore_wait(ridx, semaphore);
  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 /**
  99  * radeon_semaphore_sync_to - use the semaphore to sync to a fence
 100  *
 101  * @semaphore: semaphore object to add fence to
 102  * @fence: fence to sync to
 103  *
 104  * Sync to the fence using this semaphore object
 105  */
 106 void radeon_semaphore_sync_to(struct radeon_semaphore *semaphore,
 107                               struct radeon_fence *fence)
 108 {
 109         struct radeon_fence *other;
 110
 111         if (!fence)
 112                 return;
 113
 114         other = semaphore->sync_to[fence->ring];
 115         semaphore->sync_to[fence->ring] = radeon_fence_later(fence, other);
 116 }
 117
 118 /**
 119  * radeon_semaphore_sync_rings - sync ring to all registered fences
 120  *
 121  * @rdev: radeon_device pointer
 122  * @semaphore: semaphore object to use for sync
 123  * @ring: ring that needs sync
 124  *
 125  * Ensure that all registered fences are signaled before letting
 126  * the ring continue. The caller must hold the ring lock.
 127  */
 128 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
 129                                 struct radeon_semaphore *semaphore,
 130                                 int ring)
 131 {
 132         unsigned count = 0;
 133         int i, r;
 134
 135         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 136                 struct radeon_fence *fence = semaphore->sync_to[i];
 137
 138                 /* check if we really need to sync */
 139                 if (!radeon_fence_need_sync(fence, ring))
 140                         continue;
 141
 142                 /* prevent GPU deadlocks */
 143                 if (!rdev->ring[i].ready) {
 144                         dev_err(rdev->dev, "Syncing to a disabled ring!");
 145                         return -EINVAL;
 146                 }
 147
 148                 if (++count > RADEON_NUM_SYNCS) {
 149                         /* not enough room, wait manually */
 150                         radeon_fence_wait_locked(fence);
 151                         continue;
 152                 }
 153
 154                 /* allocate enough space for sync command */
 155                 r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
 156                 if (r) {
 157                         return r;
 158                 }
 159
 160                 /* emit the signal semaphore */
 161                 if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
 162                         /* signaling wasn't successful wait manually */
 163                         radeon_ring_undo(&rdev->ring[i]);
 164                         radeon_fence_wait_locked(fence);
 165                         continue;
 166                 }
 167
 168                 /* we assume caller has already allocated space on waiters ring */
 169                 if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
 170                         /* waiting wasn't successful wait manually */
 171                         radeon_ring_undo(&rdev->ring[i]);
 172                         radeon_fence_wait_locked(fence);
 173                         continue;
 174                 }
 175
 176                 radeon_ring_commit(rdev, &rdev->ring[i]);
 177                 radeon_fence_note_sync(fence, ring);
 178
 179                 semaphore->gpu_addr += 8;
 180         }
 181
 182         return 0;
 183 }
 184
 185 void radeon_semaphore_free(struct radeon_device *rdev,
 186                            struct radeon_semaphore **semaphore,
 187                            struct radeon_fence *fence)
 188 {
 189         if (semaphore == NULL || *semaphore == NULL) {
 190                 return;
 191         }
 192         if ((*semaphore)->waiters > 0) {
 193                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 194                         " hardware lockup imminent!\n", *semaphore);
 195         }
 196         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 197         kfree(*semaphore);
 198         *semaphore = NULL;
 199 }