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         uint64_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);
  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_fence - 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_fence(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_to - use the semaphore to sync to a reservation object
 120  *
 121  * @sema: semaphore object to add fence from reservation object to
 122  * @resv: reservation object with embedded fence
 123  * @shared: true if we should onyl sync to the exclusive fence
 124  *
 125  * Sync to the fence using this semaphore object
 126  */
 127 int radeon_semaphore_sync_resv(struct radeon_device *rdev,
 128                                struct radeon_semaphore *sema,
 129                                struct reservation_object *resv,
 130                                bool shared)
 131 {
 132         struct reservation_object_list *flist;
 133         struct fence *f;
 134         struct radeon_fence *fence;
 135         unsigned i;
 136         int r = 0;
 137
 138         /* always sync to the exclusive fence */
 139         f = reservation_object_get_excl(resv);
 140         fence = f ? to_radeon_fence(f) : NULL;
 141         if (fence && fence->rdev == rdev)
 142                 radeon_semaphore_sync_fence(sema, fence);
 143         else if (f)
 144                 r = fence_wait(f, true);
 145
 146         flist = reservation_object_get_list(resv);
 147         if (shared || !flist || r)
 148                 return r;
 149
 150         for (i = 0; i < flist->shared_count; ++i) {
 151                 f = rcu_dereference_protected(flist->shared[i],
 152                                               reservation_object_held(resv));
 153                 fence = to_radeon_fence(f);
 154                 if (fence && fence->rdev == rdev)
 155                         radeon_semaphore_sync_fence(sema, fence);
 156                 else
 157                         r = fence_wait(f, true);
 158
 159                 if (r)
 160                         break;
 161         }
 162         return r;
 163 }
 164
 165 /**
 166  * radeon_semaphore_sync_rings - sync ring to all registered fences
 167  *
 168  * @rdev: radeon_device pointer
 169  * @semaphore: semaphore object to use for sync
 170  * @ring: ring that needs sync
 171  *
 172  * Ensure that all registered fences are signaled before letting
 173  * the ring continue. The caller must hold the ring lock.
 174  */
 175 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
 176                                 struct radeon_semaphore *semaphore,
 177                                 int ring)
 178 {
 179         unsigned count = 0;
 180         int i, r;
 181
 182         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 183                 struct radeon_fence *fence = semaphore->sync_to[i];
 184
 185                 /* check if we really need to sync */
 186                 if (!radeon_fence_need_sync(fence, ring))
 187                         continue;
 188
 189                 /* prevent GPU deadlocks */
 190                 if (!rdev->ring[i].ready) {
 191                         dev_err(rdev->dev, "Syncing to a disabled ring!");
 192                         return -EINVAL;
 193                 }
 194
 195                 if (++count > RADEON_NUM_SYNCS) {
 196                         /* not enough room, wait manually */
 197                         r = radeon_fence_wait(fence, false);
 198                         if (r)
 199                                 return r;
 200                         continue;
 201                 }
 202
 203                 /* allocate enough space for sync command */
 204                 r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
 205                 if (r) {
 206                         return r;
 207                 }
 208
 209                 /* emit the signal semaphore */
 210                 if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
 211                         /* signaling wasn't successful wait manually */
 212                         radeon_ring_undo(&rdev->ring[i]);
 213                         r = radeon_fence_wait(fence, false);
 214                         if (r)
 215                                 return r;
 216                         continue;
 217                 }
 218
 219                 /* we assume caller has already allocated space on waiters ring */
 220                 if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
 221                         /* waiting wasn't successful wait manually */
 222                         radeon_ring_undo(&rdev->ring[i]);
 223                         r = radeon_fence_wait(fence, false);
 224                         if (r)
 225                                 return r;
 226                         continue;
 227                 }
 228
 229                 radeon_ring_commit(rdev, &rdev->ring[i], false);
 230                 radeon_fence_note_sync(fence, ring);
 231
 232                 semaphore->gpu_addr += 8;
 233         }
 234
 235         return 0;
 236 }
 237
 238 void radeon_semaphore_free(struct radeon_device *rdev,
 239                            struct radeon_semaphore **semaphore,
 240                            struct radeon_fence *fence)
 241 {
 242         if (semaphore == NULL || *semaphore == NULL) {
 243                 return;
 244         }
 245         if ((*semaphore)->waiters > 0) {
 246                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 247                         " hardware lockup imminent!\n", *semaphore);
 248         }
 249         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 250         kfree(*semaphore);
 251         *semaphore = NULL;
 252 }