drivers/gpu/drm/nouveau/nouveau_fence.c

   1 /*
   2  * Copyright (C) 2007 Ben Skeggs.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a 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, sublicense, 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 above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26
  27 #include <drm/drmP.h>
  28
  29 #include <linux/ktime.h>
  30 #include <linux/hrtimer.h>
  31
  32 #include "nouveau_drm.h"
  33 #include "nouveau_dma.h"
  34 #include "nouveau_fence.h"
  35
  36 #include <engine/fifo.h>
  37
  38 struct fence_work {
  39         struct work_struct base;
  40         struct list_head head;
  41         void (*func)(void *);
  42         void *data;
  43 };
  44
  45 static void
  46 nouveau_fence_signal(struct nouveau_fence *fence)
  47 {
  48         struct fence_work *work, *temp;
  49
  50         list_for_each_entry_safe(work, temp, &fence->work, head) {
  51                 schedule_work(&work->base);
  52                 list_del(&work->head);
  53         }
  54
  55         fence->channel = NULL;
  56         list_del(&fence->head);
  57 }
  58
  59 void
  60 nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
  61 {
  62         struct nouveau_fence *fence, *fnext;
  63         spin_lock(&fctx->lock);
  64         list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
  65                 nouveau_fence_signal(fence);
  66         }
  67         spin_unlock(&fctx->lock);
  68 }
  69
  70 void
  71 nouveau_fence_context_new(struct nouveau_fence_chan *fctx)
  72 {
  73         INIT_LIST_HEAD(&fctx->flip);
  74         INIT_LIST_HEAD(&fctx->pending);
  75         spin_lock_init(&fctx->lock);
  76 }
  77
  78 static void
  79 nouveau_fence_work_handler(struct work_struct *kwork)
  80 {
  81         struct fence_work *work = container_of(kwork, typeof(*work), base);
  82         work->func(work->data);
  83         kfree(work);
  84 }
  85
  86 void
  87 nouveau_fence_work(struct nouveau_fence *fence,
  88                    void (*func)(void *), void *data)
  89 {
  90         struct nouveau_channel *chan = fence->channel;
  91         struct nouveau_fence_chan *fctx;
  92         struct fence_work *work = NULL;
  93
  94         if (nouveau_fence_done(fence)) {
  95                 func(data);
  96                 return;
  97         }
  98
  99         fctx = chan->fence;
 100         work = kmalloc(sizeof(*work), GFP_KERNEL);
 101         if (!work) {
 102                 WARN_ON(nouveau_fence_wait(fence, false, false));
 103                 func(data);
 104                 return;
 105         }
 106
 107         spin_lock(&fctx->lock);
 108         if (!fence->channel) {
 109                 spin_unlock(&fctx->lock);
 110                 kfree(work);
 111                 func(data);
 112                 return;
 113         }
 114
 115         INIT_WORK(&work->base, nouveau_fence_work_handler);
 116         work->func = func;
 117         work->data = data;
 118         list_add(&work->head, &fence->work);
 119         spin_unlock(&fctx->lock);
 120 }
 121
 122 static void
 123 nouveau_fence_update(struct nouveau_channel *chan)
 124 {
 125         struct nouveau_fence_chan *fctx = chan->fence;
 126         struct nouveau_fence *fence, *fnext;
 127
 128         spin_lock(&fctx->lock);
 129         list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
 130                 if (fctx->read(chan) < fence->sequence)
 131                         break;
 132
 133                 nouveau_fence_signal(fence);
 134                 nouveau_fence_unref(&fence);
 135         }
 136         spin_unlock(&fctx->lock);
 137 }
 138
 139 int
 140 nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
 141 {
 142         struct nouveau_fence_chan *fctx = chan->fence;
 143         int ret;
 144
 145         fence->channel  = chan;
 146         fence->timeout  = jiffies + (15 * DRM_HZ);
 147         fence->sequence = ++fctx->sequence;
 148
 149         ret = fctx->emit(fence);
 150         if (!ret) {
 151                 kref_get(&fence->kref);
 152                 spin_lock(&fctx->lock);
 153                 list_add_tail(&fence->head, &fctx->pending);
 154                 spin_unlock(&fctx->lock);
 155         }
 156
 157         return ret;
 158 }
 159
 160 bool
 161 nouveau_fence_done(struct nouveau_fence *fence)
 162 {
 163         if (fence->channel)
 164                 nouveau_fence_update(fence->channel);
 165         return !fence->channel;
 166 }
 167
 168 struct nouveau_fence_uevent {
 169         struct nouveau_eventh handler;
 170         struct nouveau_fence_priv *priv;
 171 };
 172
 173 static int
 174 nouveau_fence_wait_uevent_handler(struct nouveau_eventh *event, int index)
 175 {
 176         struct nouveau_fence_uevent *uevent =
 177                 container_of(event, struct nouveau_fence_uevent, handler);
 178         wake_up_all(&uevent->priv->waiting);
 179         return NVKM_EVENT_KEEP;
 180 }
 181
 182 static int
 183 nouveau_fence_wait_uevent(struct nouveau_fence *fence, bool intr)
 184
 185 {
 186         struct nouveau_channel *chan = fence->channel;
 187         struct nouveau_fifo *pfifo = nouveau_fifo(chan->drm->device);
 188         struct nouveau_fence_priv *priv = chan->drm->fence;
 189         struct nouveau_fence_uevent uevent = {
 190                 .handler.func = nouveau_fence_wait_uevent_handler,
 191                 .priv = priv,
 192         };
 193         int ret = 0;
 194
 195         nouveau_event_get(pfifo->uevent, 0, &uevent.handler);
 196
 197         if (fence->timeout) {
 198                 unsigned long timeout = fence->timeout - jiffies;
 199
 200                 if (time_before(jiffies, fence->timeout)) {
 201                         if (intr) {
 202                                 ret = wait_event_interruptible_timeout(
 203                                                 priv->waiting,
 204                                                 nouveau_fence_done(fence),
 205                                                 timeout);
 206                         } else {
 207                                 ret = wait_event_timeout(priv->waiting,
 208                                                 nouveau_fence_done(fence),
 209                                                 timeout);
 210                         }
 211                 }
 212
 213                 if (ret >= 0) {
 214                         fence->timeout = jiffies + ret;
 215                         if (time_after_eq(jiffies, fence->timeout))
 216                                 ret = -EBUSY;
 217                 }
 218         } else {
 219                 if (intr) {
 220                         ret = wait_event_interruptible(priv->waiting,
 221                                         nouveau_fence_done(fence));
 222                 } else {
 223                         wait_event(priv->waiting, nouveau_fence_done(fence));
 224                 }
 225         }
 226
 227         nouveau_event_put(pfifo->uevent, 0, &uevent.handler);
 228         if (unlikely(ret < 0))
 229                 return ret;
 230
 231         return 0;
 232 }
 233
 234 int
 235 nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
 236 {
 237         struct nouveau_channel *chan = fence->channel;
 238         struct nouveau_fence_priv *priv = chan ? chan->drm->fence : NULL;
 239         unsigned long sleep_time = NSEC_PER_MSEC / 1000;
 240         ktime_t t;
 241         int ret = 0;
 242
 243         while (priv && priv->uevent && lazy && !nouveau_fence_done(fence)) {
 244                 ret = nouveau_fence_wait_uevent(fence, intr);
 245                 if (ret < 0)
 246                         return ret;
 247         }
 248
 249         while (!nouveau_fence_done(fence)) {
 250                 if (fence->timeout && time_after_eq(jiffies, fence->timeout)) {
 251                         ret = -EBUSY;
 252                         break;
 253                 }
 254
 255                 __set_current_state(intr ? TASK_INTERRUPTIBLE :
 256                                            TASK_UNINTERRUPTIBLE);
 257                 if (lazy) {
 258                         t = ktime_set(0, sleep_time);
 259                         schedule_hrtimeout(&t, HRTIMER_MODE_REL);
 260                         sleep_time *= 2;
 261                         if (sleep_time > NSEC_PER_MSEC)
 262                                 sleep_time = NSEC_PER_MSEC;
 263                 }
 264
 265                 if (intr && signal_pending(current)) {
 266                         ret = -ERESTARTSYS;
 267                         break;
 268                 }
 269         }
 270
 271         __set_current_state(TASK_RUNNING);
 272         return ret;
 273 }
 274
 275 int
 276 nouveau_fence_sync(struct nouveau_fence *fence, struct nouveau_channel *chan)
 277 {
 278         struct nouveau_fence_chan *fctx = chan->fence;
 279         struct nouveau_channel *prev;
 280         int ret = 0;
 281
 282         prev = fence ? fence->channel : NULL;
 283         if (prev) {
 284                 if (unlikely(prev != chan && !nouveau_fence_done(fence))) {
 285                         ret = fctx->sync(fence, prev, chan);
 286                         if (unlikely(ret))
 287                                 ret = nouveau_fence_wait(fence, true, false);
 288                 }
 289         }
 290
 291         return ret;
 292 }
 293
 294 static void
 295 nouveau_fence_del(struct kref *kref)
 296 {
 297         struct nouveau_fence *fence = container_of(kref, typeof(*fence), kref);
 298         kfree(fence);
 299 }
 300
 301 void
 302 nouveau_fence_unref(struct nouveau_fence **pfence)
 303 {
 304         if (*pfence)
 305                 kref_put(&(*pfence)->kref, nouveau_fence_del);
 306         *pfence = NULL;
 307 }
 308
 309 struct nouveau_fence *
 310 nouveau_fence_ref(struct nouveau_fence *fence)
 311 {
 312         kref_get(&fence->kref);
 313         return fence;
 314 }
 315
 316 int
 317 nouveau_fence_new(struct nouveau_channel *chan, bool sysmem,
 318                   struct nouveau_fence **pfence)
 319 {
 320         struct nouveau_fence *fence;
 321         int ret = 0;
 322
 323         if (unlikely(!chan->fence))
 324                 return -ENODEV;
 325
 326         fence = kzalloc(sizeof(*fence), GFP_KERNEL);
 327         if (!fence)
 328                 return -ENOMEM;
 329
 330         INIT_LIST_HEAD(&fence->work);
 331         fence->sysmem = sysmem;
 332         kref_init(&fence->kref);
 333
 334         ret = nouveau_fence_emit(fence, chan);
 335         if (ret)
 336                 nouveau_fence_unref(&fence);
 337
 338         *pfence = fence;
 339         return ret;
 340 }