drivers/gpu/drm/radeon/radeon_sync.c

   1 /*
   2  * Copyright 2014 Advanced Micro Devices, Inc.
   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 <[email protected]>
  29  */
  30
  31 #include "radeon.h"
  32 #include "radeon_trace.h"
  33
  34 /**
  35  * radeon_sync_create - zero init sync object
  36  *
  37  * @sync: sync object to initialize
  38  *
  39  * Just clear the sync object for now.
  40  */
  41 void radeon_sync_create(struct radeon_sync *sync)
  42 {
  43         unsigned i;
  44
  45         for (i = 0; i < RADEON_NUM_SYNCS; ++i)
  46                 sync->semaphores[i] = NULL;
  47
  48         for (i = 0; i < RADEON_NUM_RINGS; ++i)
  49                 sync->sync_to[i] = NULL;
  50
  51         sync->last_vm_update = NULL;
  52 }
  53
  54 /**
  55  * radeon_sync_fence - use the semaphore to sync to a fence
  56  *
  57  * @sync: sync object to add fence to
  58  * @fence: fence to sync to
  59  *
  60  * Sync to the fence using the semaphore objects
  61  */
  62 void radeon_sync_fence(struct radeon_sync *sync,
  63                        struct radeon_fence *fence)
  64 {
  65         struct radeon_fence *other;
  66
  67         if (!fence)
  68                 return;
  69
  70         other = sync->sync_to[fence->ring];
  71         sync->sync_to[fence->ring] = radeon_fence_later(fence, other);
  72
  73         if (fence->is_vm_update) {
  74                 other = sync->last_vm_update;
  75                 sync->last_vm_update = radeon_fence_later(fence, other);
  76         }
  77 }
  78
  79 /**
  80  * radeon_sync_resv - use the semaphores to sync to a reservation object
  81  *
  82  * @rdev: radeon_device pointer
  83  * @sync: sync object to add fences from reservation object to
  84  * @resv: reservation object with embedded fence
  85  * @shared: true if we should only sync to the exclusive fence
  86  *
  87  * Sync to the fence using the semaphore objects
  88  */
  89 int radeon_sync_resv(struct radeon_device *rdev,
  90                      struct radeon_sync *sync,
  91                      struct dma_resv *resv,
  92                      bool shared)
  93 {
  94         struct dma_resv_iter cursor;
  95         struct radeon_fence *fence;
  96         struct dma_fence *f;
  97         int r = 0;
  98
  99         dma_resv_for_each_fence(&cursor, resv, dma_resv_usage_rw(!shared), f) {
 100                 fence = to_radeon_fence(f);
 101                 if (fence && fence->rdev == rdev)
 102                         radeon_sync_fence(sync, fence);
 103                 else
 104                         r = dma_fence_wait(f, true);
 105                 if (r)
 106                         break;
 107         }
 108         return r;
 109 }
 110
 111 /**
 112  * radeon_sync_rings - sync ring to all registered fences
 113  *
 114  * @rdev: radeon_device pointer
 115  * @sync: sync object to use
 116  * @ring: ring that needs sync
 117  *
 118  * Ensure that all registered fences are signaled before letting
 119  * the ring continue. The caller must hold the ring lock.
 120  */
 121 int radeon_sync_rings(struct radeon_device *rdev,
 122                       struct radeon_sync *sync,
 123                       int ring)
 124 {
 125         unsigned count = 0;
 126         int i, r;
 127
 128         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 129                 struct radeon_fence *fence = sync->sync_to[i];
 130                 struct radeon_semaphore *semaphore;
 131
 132                 /* check if we really need to sync */
 133                 if (!radeon_fence_need_sync(fence, ring))
 134                         continue;
 135
 136                 /* prevent GPU deadlocks */
 137                 if (!rdev->ring[i].ready) {
 138                         dev_err(rdev->dev, "Syncing to a disabled ring!");
 139                         return -EINVAL;
 140                 }
 141
 142                 if (count >= RADEON_NUM_SYNCS) {
 143                         /* not enough room, wait manually */
 144                         r = radeon_fence_wait(fence, false);
 145                         if (r)
 146                                 return r;
 147                         continue;
 148                 }
 149                 r = radeon_semaphore_create(rdev, &semaphore);
 150                 if (r)
 151                         return r;
 152
 153                 sync->semaphores[count++] = semaphore;
 154
 155                 /* allocate enough space for sync command */
 156                 r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
 157                 if (r)
 158                         return r;
 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                         r = radeon_fence_wait(fence, false);
 165                         if (r)
 166                                 return r;
 167                         continue;
 168                 }
 169
 170                 /* we assume caller has already allocated space on waiters ring */
 171                 if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
 172                         /* waiting wasn't successful wait manually */
 173                         radeon_ring_undo(&rdev->ring[i]);
 174                         r = radeon_fence_wait(fence, false);
 175                         if (r)
 176                                 return r;
 177                         continue;
 178                 }
 179
 180                 radeon_ring_commit(rdev, &rdev->ring[i], false);
 181                 radeon_fence_note_sync(fence, ring);
 182         }
 183
 184         return 0;
 185 }
 186
 187 /**
 188  * radeon_sync_free - free the sync object
 189  *
 190  * @rdev: radeon_device pointer
 191  * @sync: sync object to use
 192  * @fence: fence to use for the free
 193  *
 194  * Free the sync object by freeing all semaphores in it.
 195  */
 196 void radeon_sync_free(struct radeon_device *rdev,
 197                       struct radeon_sync *sync,
 198                       struct radeon_fence *fence)
 199 {
 200         unsigned i;
 201
 202         for (i = 0; i < RADEON_NUM_SYNCS; ++i)
 203                 radeon_semaphore_free(rdev, &sync->semaphores[i], fence);
 204 }