drivers/gpu/drm/radeon/radeon_fence.c

   1 /*
   2  * Copyright 2009 Jerome Glisse.
   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  *    Jerome Glisse <glisse@freedesktop.org>
  29  *    Dave Airlie
  30  */
  31 #include <linux/seq_file.h>
  32 #include <asm/atomic.h>
  33 #include <linux/wait.h>
  34 #include <linux/list.h>
  35 #include <linux/kref.h>
  36 #include "drmP.h"
  37 #include "drm.h"
  38 #include "radeon_reg.h"
  39 #include "radeon.h"
  40
  41 int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence *fence)
  42 {
  43         unsigned long irq_flags;
  44
  45         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  46         if (fence->emited) {
  47                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  48                 return 0;
  49         }
  50         fence->seq = atomic_add_return(1, &rdev->fence_drv.seq);
  51         if (!rdev->cp.ready) {
  52                 /* FIXME: cp is not running assume everythings is done right
  53                  * away
  54                  */
  55                 WREG32(rdev->fence_drv.scratch_reg, fence->seq);
  56         } else {
  57                 radeon_fence_ring_emit(rdev, fence);
  58         }
  59         fence->emited = true;
  60         fence->timeout = jiffies + ((2000 * HZ) / 1000);
  61         list_del(&fence->list);
  62         list_add_tail(&fence->list, &rdev->fence_drv.emited);
  63         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  64         return 0;
  65 }
  66
  67 static bool radeon_fence_poll_locked(struct radeon_device *rdev)
  68 {
  69         struct radeon_fence *fence;
  70         struct list_head *i, *n;
  71         uint32_t seq;
  72         bool wake = false;
  73
  74         if (rdev == NULL) {
  75                 return true;
  76         }
  77         if (rdev->shutdown) {
  78                 return true;
  79         }
  80         seq = RREG32(rdev->fence_drv.scratch_reg);
  81         rdev->fence_drv.last_seq = seq;
  82         n = NULL;
  83         list_for_each(i, &rdev->fence_drv.emited) {
  84                 fence = list_entry(i, struct radeon_fence, list);
  85                 if (fence->seq == seq) {
  86                         n = i;
  87                         break;
  88                 }
  89         }
  90         /* all fence previous to this one are considered as signaled */
  91         if (n) {
  92                 i = n;
  93                 do {
  94                         n = i->prev;
  95                         list_del(i);
  96                         list_add_tail(i, &rdev->fence_drv.signaled);
  97                         fence = list_entry(i, struct radeon_fence, list);
  98                         fence->signaled = true;
  99                         i = n;
 100                 } while (i != &rdev->fence_drv.emited);
 101                 wake = true;
 102         }
 103         return wake;
 104 }
 105
 106 static void radeon_fence_destroy(struct kref *kref)
 107 {
 108         unsigned long irq_flags;
 109         struct radeon_fence *fence;
 110
 111         fence = container_of(kref, struct radeon_fence, kref);
 112         write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);
 113         list_del(&fence->list);
 114         fence->emited = false;
 115         write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags);
 116         kfree(fence);
 117 }
 118
 119 int radeon_fence_create(struct radeon_device *rdev, struct radeon_fence **fence)
 120 {
 121         unsigned long irq_flags;
 122
 123         *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL);
 124         if ((*fence) == NULL) {
 125                 return -ENOMEM;
 126         }
 127         kref_init(&((*fence)->kref));
 128         (*fence)->rdev = rdev;
 129         (*fence)->emited = false;
 130         (*fence)->signaled = false;
 131         (*fence)->seq = 0;
 132         INIT_LIST_HEAD(&(*fence)->list);
 133
 134         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 135         list_add_tail(&(*fence)->list, &rdev->fence_drv.created);
 136         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 137         return 0;
 138 }
 139
 140
 141 bool radeon_fence_signaled(struct radeon_fence *fence)
 142 {
 143         struct radeon_device *rdev = fence->rdev;
 144         unsigned long irq_flags;
 145         bool signaled = false;
 146
 147         if (rdev->gpu_lockup) {
 148                 return true;
 149         }
 150         if (fence == NULL) {
 151                 return true;
 152         }
 153         write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);
 154         signaled = fence->signaled;
 155         /* if we are shuting down report all fence as signaled */
 156         if (fence->rdev->shutdown) {
 157                 signaled = true;
 158         }
 159         if (!fence->emited) {
 160                 WARN(1, "Querying an unemited fence : %p !\n", fence);
 161                 signaled = true;
 162         }
 163         if (!signaled) {
 164                 radeon_fence_poll_locked(fence->rdev);
 165                 signaled = fence->signaled;
 166         }
 167         write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags);
 168         return signaled;
 169 }
 170
 171 int radeon_fence_wait(struct radeon_fence *fence, bool interruptible)
 172 {
 173         struct radeon_device *rdev;
 174         unsigned long cur_jiffies;
 175         unsigned long timeout;
 176         bool expired = false;
 177         int r;
 178
 179
 180         if (fence == NULL) {
 181                 WARN(1, "Querying an invalid fence : %p !\n", fence);
 182                 return 0;
 183         }
 184         rdev = fence->rdev;
 185         if (radeon_fence_signaled(fence)) {
 186                 return 0;
 187         }
 188 retry:
 189         cur_jiffies = jiffies;
 190         timeout = HZ / 100;
 191         if (time_after(fence->timeout, cur_jiffies)) {
 192                 timeout = fence->timeout - cur_jiffies;
 193         }
 194         if (interruptible) {
 195                 r = wait_event_interruptible_timeout(rdev->fence_drv.queue,
 196                                 radeon_fence_signaled(fence), timeout);
 197                 if (unlikely(r == -ERESTARTSYS)) {
 198                         return -EBUSY;
 199                 }
 200         } else {
 201                 r = wait_event_timeout(rdev->fence_drv.queue,
 202                          radeon_fence_signaled(fence), timeout);
 203         }
 204         if (unlikely(!radeon_fence_signaled(fence))) {
 205                 if (unlikely(r == 0)) {
 206                         expired = true;
 207                 }
 208                 if (unlikely(expired)) {
 209                         timeout = 1;
 210                         if (time_after(cur_jiffies, fence->timeout)) {
 211                                 timeout = cur_jiffies - fence->timeout;
 212                         }
 213                         timeout = jiffies_to_msecs(timeout);
 214                         if (timeout > 500) {
 215                                 DRM_ERROR("fence(%p:0x%08X) %lums timeout "
 216                                           "going to reset GPU\n",
 217                                           fence, fence->seq, timeout);
 218                                 radeon_gpu_reset(rdev);
 219                                 WREG32(rdev->fence_drv.scratch_reg, fence->seq);
 220                         }
 221                 }
 222                 goto retry;
 223         }
 224         if (unlikely(expired)) {
 225                 rdev->fence_drv.count_timeout++;
 226                 cur_jiffies = jiffies;
 227                 timeout = 1;
 228                 if (time_after(cur_jiffies, fence->timeout)) {
 229                         timeout = cur_jiffies - fence->timeout;
 230                 }
 231                 timeout = jiffies_to_msecs(timeout);
 232                 DRM_ERROR("fence(%p:0x%08X) %lums timeout\n",
 233                           fence, fence->seq, timeout);
 234                 DRM_ERROR("last signaled fence(0x%08X)\n",
 235                           rdev->fence_drv.last_seq);
 236         }
 237         return 0;
 238 }
 239
 240 int radeon_fence_wait_next(struct radeon_device *rdev)
 241 {
 242         unsigned long irq_flags;
 243         struct radeon_fence *fence;
 244         int r;
 245
 246         if (rdev->gpu_lockup) {
 247                 return 0;
 248         }
 249         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 250         if (list_empty(&rdev->fence_drv.emited)) {
 251                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 252                 return 0;
 253         }
 254         fence = list_entry(rdev->fence_drv.emited.next,
 255                            struct radeon_fence, list);
 256         radeon_fence_ref(fence);
 257         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 258         r = radeon_fence_wait(fence, false);
 259         radeon_fence_unref(&fence);
 260         return r;
 261 }
 262
 263 int radeon_fence_wait_last(struct radeon_device *rdev)
 264 {
 265         unsigned long irq_flags;
 266         struct radeon_fence *fence;
 267         int r;
 268
 269         if (rdev->gpu_lockup) {
 270                 return 0;
 271         }
 272         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 273         if (list_empty(&rdev->fence_drv.emited)) {
 274                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 275                 return 0;
 276         }
 277         fence = list_entry(rdev->fence_drv.emited.prev,
 278                            struct radeon_fence, list);
 279         radeon_fence_ref(fence);
 280         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 281         r = radeon_fence_wait(fence, false);
 282         radeon_fence_unref(&fence);
 283         return r;
 284 }
 285
 286 struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)
 287 {
 288         kref_get(&fence->kref);
 289         return fence;
 290 }
 291
 292 void radeon_fence_unref(struct radeon_fence **fence)
 293 {
 294         struct radeon_fence *tmp = *fence;
 295
 296         *fence = NULL;
 297         if (tmp) {
 298                 kref_put(&tmp->kref, &radeon_fence_destroy);
 299         }
 300 }
 301
 302 void radeon_fence_process(struct radeon_device *rdev)
 303 {
 304         unsigned long irq_flags;
 305         bool wake;
 306
 307         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 308         wake = radeon_fence_poll_locked(rdev);
 309         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 310         if (wake) {
 311                 wake_up_all(&rdev->fence_drv.queue);
 312         }
 313 }
 314
 315 int radeon_fence_driver_init(struct radeon_device *rdev)
 316 {
 317         unsigned long irq_flags;
 318         int r;
 319
 320         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 321         r = radeon_scratch_get(rdev, &rdev->fence_drv.scratch_reg);
 322         if (r) {
 323                 DRM_ERROR("Fence failed to get a scratch register.");
 324                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 325                 return r;
 326         }
 327         WREG32(rdev->fence_drv.scratch_reg, 0);
 328         atomic_set(&rdev->fence_drv.seq, 0);
 329         INIT_LIST_HEAD(&rdev->fence_drv.created);
 330         INIT_LIST_HEAD(&rdev->fence_drv.emited);
 331         INIT_LIST_HEAD(&rdev->fence_drv.signaled);
 332         rdev->fence_drv.count_timeout = 0;
 333         init_waitqueue_head(&rdev->fence_drv.queue);
 334         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 335         if (radeon_debugfs_fence_init(rdev)) {
 336                 DRM_ERROR("Failed to register debugfs file for fence !\n");
 337         }
 338         return 0;
 339 }
 340
 341 void radeon_fence_driver_fini(struct radeon_device *rdev)
 342 {
 343         unsigned long irq_flags;
 344
 345         wake_up_all(&rdev->fence_drv.queue);
 346         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 347         radeon_scratch_free(rdev, rdev->fence_drv.scratch_reg);
 348         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
 349         DRM_INFO("radeon: fence finalized\n");
 350 }
 351
 352
 353 /*
 354  * Fence debugfs
 355  */
 356 #if defined(CONFIG_DEBUG_FS)
 357 static int radeon_debugfs_fence_info(struct seq_file *m, void *data)
 358 {
 359         struct drm_info_node *node = (struct drm_info_node *)m->private;
 360         struct drm_device *dev = node->minor->dev;
 361         struct radeon_device *rdev = dev->dev_private;
 362         struct radeon_fence *fence;
 363
 364         seq_printf(m, "Last signaled fence 0x%08X\n",
 365                    RREG32(rdev->fence_drv.scratch_reg));
 366         if (!list_empty(&rdev->fence_drv.emited)) {
 367                    fence = list_entry(rdev->fence_drv.emited.prev,
 368                                       struct radeon_fence, list);
 369                    seq_printf(m, "Last emited fence %p with 0x%08X\n",
 370                               fence,  fence->seq);
 371         }
 372         return 0;
 373 }
 374
 375 static struct drm_info_list radeon_debugfs_fence_list[] = {
 376         {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL},
 377 };
 378 #endif
 379
 380 int radeon_debugfs_fence_init(struct radeon_device *rdev)
 381 {
 382 #if defined(CONFIG_DEBUG_FS)
 383         return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 1);
 384 #else
 385         return 0;
 386 #endif
 387 }