LXR linux/drivers/gpu/drm/radeon/radeon

   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 <christian.koenig@amd.com>
  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 */
  41void 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 */
  62void 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 */
  89int 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_list *flist;
  95        struct dma_fence *f;
  96        struct radeon_fence *fence;
  97        unsigned i;
  98        int r = 0;
  99
 100        /* always sync to the exclusive fence */
 101        f = dma_resv_excl_fence(resv);
 102        fence = f ? to_radeon_fence(f) : NULL;
 103        if (fence && fence->rdev == rdev)
 104                radeon_sync_fence(sync, fence);
 105        else if (f)
 106                r = dma_fence_wait(f, true);
 107
 108        flist = dma_resv_shared_list(resv);
 109        if (shared || !flist || r)
 110                return r;
 111
 112        for (i = 0; i < flist->shared_count; ++i) {
 113                f = rcu_dereference_protected(flist->shared[i],
 114                                              dma_resv_held(resv));
 115                fence = to_radeon_fence(f);
 116                if (fence && fence->rdev == rdev)
 117                        radeon_sync_fence(sync, fence);
 118                else
 119                        r = dma_fence_wait(f, true);
 120
 121                if (r)
 122                        break;
 123        }
 124        return r;
 125}
 126
 127/**
 128 * radeon_sync_rings - sync ring to all registered fences
 129 *
 130 * @rdev: radeon_device pointer
 131 * @sync: sync object to use
 132 * @ring: ring that needs sync
 133 *
 134 * Ensure that all registered fences are signaled before letting
 135 * the ring continue. The caller must hold the ring lock.
 136 */
 137int radeon_sync_rings(struct radeon_device *rdev,
 138                      struct radeon_sync *sync,
 139                      int ring)
 140{
 141        unsigned count = 0;
 142        int i, r;
 143
 144        for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 145                struct radeon_fence *fence = sync->sync_to[i];
 146                struct radeon_semaphore *semaphore;
 147
 148                /* check if we really need to sync */
 149                if (!radeon_fence_need_sync(fence, ring))
 150                        continue;
 151
 152                /* prevent GPU deadlocks */
 153                if (!rdev->ring[i].ready) {
 154                        dev_err(rdev->dev, "Syncing to a disabled ring!");
 155                        return -EINVAL;
 156                }
 157
 158                if (count >= RADEON_NUM_SYNCS) {
 159                        /* not enough room, wait manually */
 160                        r = radeon_fence_wait(fence, false);
 161                        if (r)
 162                                return r;
 163                        continue;
 164                }
 165                r = radeon_semaphore_create(rdev, &semaphore);
 166                if (r)
 167                        return r;
 168
 169                sync->semaphores[count++] = semaphore;
 170
 171                /* allocate enough space for sync command */
 172                r = radeon_ring_alloc(rdev, &rdev->ring[i], 16);
 173                if (r)
 174                        return r;
 175
 176                /* emit the signal semaphore */
 177                if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) {
 178                        /* signaling wasn't successful wait manually */
 179                        radeon_ring_undo(&rdev->ring[i]);
 180                        r = radeon_fence_wait(fence, false);
 181                        if (r)
 182                                return r;
 183                        continue;
 184                }
 185
 186                /* we assume caller has already allocated space on waiters ring */
 187                if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) {
 188                        /* waiting wasn't successful wait manually */
 189                        radeon_ring_undo(&rdev->ring[i]);
 190                        r = radeon_fence_wait(fence, false);
 191                        if (r)
 192                                return r;
 193                        continue;
 194                }
 195
 196                radeon_ring_commit(rdev, &rdev->ring[i], false);
 197                radeon_fence_note_sync(fence, ring);
 198        }
 199
 200        return 0;
 201}
 202
 203/**
 204 * radeon_sync_free - free the sync object
 205 *
 206 * @rdev: radeon_device pointer
 207 * @sync: sync object to use
 208 * @fence: fence to use for the free
 209 *
 210 * Free the sync object by freeing all semaphores in it.
 211 */
 212void radeon_sync_free(struct radeon_device *rdev,
 213                      struct radeon_sync *sync,
 214                      struct radeon_fence *fence)
 215{
 216        unsigned i;
 217
 218        for (i = 0; i < RADEON_NUM_SYNCS; ++i)
 219                radeon_semaphore_free(rdev, &sync->semaphores[i], fence);
 220}
 221