drivers/gpu/drm/radeon/radeon_ring.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  *          Christian König
  28  */
  29 #include <linux/seq_file.h>
  30 #include <linux/slab.h>
  31 #include "drmP.h"
  32 #include "radeon_drm.h"
  33 #include "radeon_reg.h"
  34 #include "radeon.h"
  35 #include "atom.h"
  36
  37 /*
  38  * IB.
  39  */
  40 int radeon_debugfs_sa_init(struct radeon_device *rdev);
  41
  42 int radeon_ib_get(struct radeon_device *rdev, int ring,
  43                   struct radeon_ib *ib, unsigned size)
  44 {
  45         int i, r;
  46
  47         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, &ib->sa_bo, size, 256, true);
  48         if (r) {
  49                 dev_err(rdev->dev, "failed to get a new IB (%d)\n", r);
  50                 return r;
  51         }
  52
  53         r = radeon_semaphore_create(rdev, &ib->semaphore);
  54         if (r) {
  55                 return r;
  56         }
  57
  58         ib->ring = ring;
  59         ib->fence = NULL;
  60         ib->ptr = radeon_sa_bo_cpu_addr(ib->sa_bo);
  61         ib->gpu_addr = radeon_sa_bo_gpu_addr(ib->sa_bo);
  62         ib->vm_id = 0;
  63         ib->is_const_ib = false;
  64         for (i = 0; i < RADEON_NUM_RINGS; ++i)
  65                 ib->sync_to[i] = NULL;
  66
  67         return 0;
  68 }
  69
  70 void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib *ib)
  71 {
  72         radeon_semaphore_free(rdev, &ib->semaphore, ib->fence);
  73         radeon_sa_bo_free(rdev, &ib->sa_bo, ib->fence);
  74         radeon_fence_unref(&ib->fence);
  75 }
  76
  77 int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib)
  78 {
  79         struct radeon_ring *ring = &rdev->ring[ib->ring];
  80         bool need_sync = false;
  81         int i, r = 0;
  82
  83         if (!ib->length_dw || !ring->ready) {
  84                 /* TODO: Nothings in the ib we should report. */
  85                 dev_err(rdev->dev, "couldn't schedule ib\n");
  86                 return -EINVAL;
  87         }
  88
  89         /* 64 dwords should be enough for fence too */
  90         r = radeon_ring_lock(rdev, ring, 64 + RADEON_NUM_RINGS * 8);
  91         if (r) {
  92                 dev_err(rdev->dev, "scheduling IB failed (%d).\n", r);
  93                 return r;
  94         }
  95         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
  96                 struct radeon_fence *fence = ib->sync_to[i];
  97                 if (radeon_fence_need_sync(fence, ib->ring)) {
  98                         need_sync = true;
  99                         radeon_semaphore_sync_rings(rdev, ib->semaphore,
 100                                                     fence->ring, ib->ring);
 101                         radeon_fence_note_sync(fence, ib->ring);
 102                 }
 103         }
 104         /* immediately free semaphore when we don't need to sync */
 105         if (!need_sync) {
 106                 radeon_semaphore_free(rdev, &ib->semaphore, NULL);
 107         }
 108         radeon_ring_ib_execute(rdev, ib->ring, ib);
 109         r = radeon_fence_emit(rdev, &ib->fence, ib->ring);
 110         if (r) {
 111                 dev_err(rdev->dev, "failed to emit fence for new IB (%d)\n", r);
 112                 radeon_ring_unlock_undo(rdev, ring);
 113                 return r;
 114         }
 115         radeon_ring_unlock_commit(rdev, ring);
 116         return 0;
 117 }
 118
 119 int radeon_ib_pool_init(struct radeon_device *rdev)
 120 {
 121         int r;
 122
 123         if (rdev->ib_pool_ready) {
 124                 return 0;
 125         }
 126         r = radeon_sa_bo_manager_init(rdev, &rdev->ring_tmp_bo,
 127                                       RADEON_IB_POOL_SIZE*64*1024,
 128                                       RADEON_GEM_DOMAIN_GTT);
 129         if (r) {
 130                 return r;
 131         }
 132         rdev->ib_pool_ready = true;
 133         if (radeon_debugfs_sa_init(rdev)) {
 134                 dev_err(rdev->dev, "failed to register debugfs file for SA\n");
 135         }
 136         return 0;
 137 }
 138
 139 void radeon_ib_pool_fini(struct radeon_device *rdev)
 140 {
 141         if (rdev->ib_pool_ready) {
 142                 radeon_sa_bo_manager_fini(rdev, &rdev->ring_tmp_bo);
 143                 rdev->ib_pool_ready = false;
 144         }
 145 }
 146
 147 int radeon_ib_pool_start(struct radeon_device *rdev)
 148 {
 149         return radeon_sa_bo_manager_start(rdev, &rdev->ring_tmp_bo);
 150 }
 151
 152 int radeon_ib_pool_suspend(struct radeon_device *rdev)
 153 {
 154         return radeon_sa_bo_manager_suspend(rdev, &rdev->ring_tmp_bo);
 155 }
 156
 157 int radeon_ib_ring_tests(struct radeon_device *rdev)
 158 {
 159         unsigned i;
 160         int r;
 161
 162         for (i = 0; i < RADEON_NUM_RINGS; ++i) {
 163                 struct radeon_ring *ring = &rdev->ring[i];
 164
 165                 if (!ring->ready)
 166                         continue;
 167
 168                 r = radeon_ib_test(rdev, i, ring);
 169                 if (r) {
 170                         ring->ready = false;
 171
 172                         if (i == RADEON_RING_TYPE_GFX_INDEX) {
 173                                 /* oh, oh, that's really bad */
 174                                 DRM_ERROR("radeon: failed testing IB on GFX ring (%d).\n", r);
 175                                 rdev->accel_working = false;
 176                                 return r;
 177
 178                         } else {
 179                                 /* still not good, but we can live with it */
 180                                 DRM_ERROR("radeon: failed testing IB on ring %d (%d).\n", i, r);
 181                         }
 182                 }
 183         }
 184         return 0;
 185 }
 186
 187 /*
 188  * Ring.
 189  */
 190 int radeon_debugfs_ring_init(struct radeon_device *rdev, struct radeon_ring *ring);
 191
 192 void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
 193 {
 194 #if DRM_DEBUG_CODE
 195         if (ring->count_dw <= 0) {
 196                 DRM_ERROR("radeon: writting more dword to ring than expected !\n");
 197         }
 198 #endif
 199         ring->ring[ring->wptr++] = v;
 200         ring->wptr &= ring->ptr_mask;
 201         ring->count_dw--;
 202         ring->ring_free_dw--;
 203 }
 204
 205 int radeon_ring_index(struct radeon_device *rdev, struct radeon_ring *ring)
 206 {
 207         /* r1xx-r5xx only has CP ring */
 208         if (rdev->family < CHIP_R600)
 209                 return RADEON_RING_TYPE_GFX_INDEX;
 210
 211         if (rdev->family >= CHIP_CAYMAN) {
 212                 if (ring == &rdev->ring[CAYMAN_RING_TYPE_CP1_INDEX])
 213                         return CAYMAN_RING_TYPE_CP1_INDEX;
 214                 else if (ring == &rdev->ring[CAYMAN_RING_TYPE_CP2_INDEX])
 215                         return CAYMAN_RING_TYPE_CP2_INDEX;
 216         }
 217         return RADEON_RING_TYPE_GFX_INDEX;
 218 }
 219
 220 void radeon_ring_free_size(struct radeon_device *rdev, struct radeon_ring *ring)
 221 {
 222         u32 rptr;
 223
 224         if (rdev->wb.enabled)
 225                 rptr = le32_to_cpu(rdev->wb.wb[ring->rptr_offs/4]);
 226         else
 227                 rptr = RREG32(ring->rptr_reg);
 228         ring->rptr = (rptr & ring->ptr_reg_mask) >> ring->ptr_reg_shift;
 229         /* This works because ring_size is a power of 2 */
 230         ring->ring_free_dw = (ring->rptr + (ring->ring_size / 4));
 231         ring->ring_free_dw -= ring->wptr;
 232         ring->ring_free_dw &= ring->ptr_mask;
 233         if (!ring->ring_free_dw) {
 234                 ring->ring_free_dw = ring->ring_size / 4;
 235         }
 236 }
 237
 238
 239 int radeon_ring_alloc(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ndw)
 240 {
 241         int r;
 242
 243         /* Align requested size with padding so unlock_commit can
 244          * pad safely */
 245         ndw = (ndw + ring->align_mask) & ~ring->align_mask;
 246         while (ndw > (ring->ring_free_dw - 1)) {
 247                 radeon_ring_free_size(rdev, ring);
 248                 if (ndw < ring->ring_free_dw) {
 249                         break;
 250                 }
 251                 r = radeon_fence_wait_next_locked(rdev, radeon_ring_index(rdev, ring));
 252                 if (r)
 253                         return r;
 254         }
 255         ring->count_dw = ndw;
 256         ring->wptr_old = ring->wptr;
 257         return 0;
 258 }
 259
 260 int radeon_ring_lock(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ndw)
 261 {
 262         int r;
 263
 264         mutex_lock(&rdev->ring_lock);
 265         r = radeon_ring_alloc(rdev, ring, ndw);
 266         if (r) {
 267                 mutex_unlock(&rdev->ring_lock);
 268                 return r;
 269         }
 270         return 0;
 271 }
 272
 273 void radeon_ring_commit(struct radeon_device *rdev, struct radeon_ring *ring)
 274 {
 275         unsigned count_dw_pad;
 276         unsigned i;
 277
 278         /* We pad to match fetch size */
 279         count_dw_pad = (ring->align_mask + 1) -
 280                        (ring->wptr & ring->align_mask);
 281         for (i = 0; i < count_dw_pad; i++) {
 282                 radeon_ring_write(ring, ring->nop);
 283         }
 284         DRM_MEMORYBARRIER();
 285         WREG32(ring->wptr_reg, (ring->wptr << ring->ptr_reg_shift) & ring->ptr_reg_mask);
 286         (void)RREG32(ring->wptr_reg);
 287 }
 288
 289 void radeon_ring_unlock_commit(struct radeon_device *rdev, struct radeon_ring *ring)
 290 {
 291         radeon_ring_commit(rdev, ring);
 292         mutex_unlock(&rdev->ring_lock);
 293 }
 294
 295 void radeon_ring_undo(struct radeon_ring *ring)
 296 {
 297         ring->wptr = ring->wptr_old;
 298 }
 299
 300 void radeon_ring_unlock_undo(struct radeon_device *rdev, struct radeon_ring *ring)
 301 {
 302         radeon_ring_undo(ring);
 303         mutex_unlock(&rdev->ring_lock);
 304 }
 305
 306 void radeon_ring_force_activity(struct radeon_device *rdev, struct radeon_ring *ring)
 307 {
 308         int r;
 309
 310         radeon_ring_free_size(rdev, ring);
 311         if (ring->rptr == ring->wptr) {
 312                 r = radeon_ring_alloc(rdev, ring, 1);
 313                 if (!r) {
 314                         radeon_ring_write(ring, ring->nop);
 315                         radeon_ring_commit(rdev, ring);
 316                 }
 317         }
 318 }
 319
 320 void radeon_ring_lockup_update(struct radeon_ring *ring)
 321 {
 322         ring->last_rptr = ring->rptr;
 323         ring->last_activity = jiffies;
 324 }
 325
 326 /**
 327  * radeon_ring_test_lockup() - check if ring is lockedup by recording information
 328  * @rdev:       radeon device structure
 329  * @ring:       radeon_ring structure holding ring information
 330  *
 331  * We don't need to initialize the lockup tracking information as we will either
 332  * have CP rptr to a different value of jiffies wrap around which will force
 333  * initialization of the lockup tracking informations.
 334  *
 335  * A possible false positivie is if we get call after while and last_cp_rptr ==
 336  * the current CP rptr, even if it's unlikely it might happen. To avoid this
 337  * if the elapsed time since last call is bigger than 2 second than we return
 338  * false and update the tracking information. Due to this the caller must call
 339  * radeon_ring_test_lockup several time in less than 2sec for lockup to be reported
 340  * the fencing code should be cautious about that.
 341  *
 342  * Caller should write to the ring to force CP to do something so we don't get
 343  * false positive when CP is just gived nothing to do.
 344  *
 345  **/
 346 bool radeon_ring_test_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
 347 {
 348         unsigned long cjiffies, elapsed;
 349         uint32_t rptr;
 350
 351         cjiffies = jiffies;
 352         if (!time_after(cjiffies, ring->last_activity)) {
 353                 /* likely a wrap around */
 354                 radeon_ring_lockup_update(ring);
 355                 return false;
 356         }
 357         rptr = RREG32(ring->rptr_reg);
 358         ring->rptr = (rptr & ring->ptr_reg_mask) >> ring->ptr_reg_shift;
 359         if (ring->rptr != ring->last_rptr) {
 360                 /* CP is still working no lockup */
 361                 radeon_ring_lockup_update(ring);
 362                 return false;
 363         }
 364         elapsed = jiffies_to_msecs(cjiffies - ring->last_activity);
 365         if (radeon_lockup_timeout && elapsed >= radeon_lockup_timeout) {
 366                 dev_err(rdev->dev, "GPU lockup CP stall for more than %lumsec\n", elapsed);
 367                 return true;
 368         }
 369         /* give a chance to the GPU ... */
 370         return false;
 371 }
 372
 373 int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ring_size,
 374                      unsigned rptr_offs, unsigned rptr_reg, unsigned wptr_reg,
 375                      u32 ptr_reg_shift, u32 ptr_reg_mask, u32 nop)
 376 {
 377         int r;
 378
 379         ring->ring_size = ring_size;
 380         ring->rptr_offs = rptr_offs;
 381         ring->rptr_reg = rptr_reg;
 382         ring->wptr_reg = wptr_reg;
 383         ring->ptr_reg_shift = ptr_reg_shift;
 384         ring->ptr_reg_mask = ptr_reg_mask;
 385         ring->nop = nop;
 386         /* Allocate ring buffer */
 387         if (ring->ring_obj == NULL) {
 388                 r = radeon_bo_create(rdev, ring->ring_size, PAGE_SIZE, true,
 389                                      RADEON_GEM_DOMAIN_GTT,
 390                                      NULL, &ring->ring_obj);
 391                 if (r) {
 392                         dev_err(rdev->dev, "(%d) ring create failed\n", r);
 393                         return r;
 394                 }
 395                 r = radeon_bo_reserve(ring->ring_obj, false);
 396                 if (unlikely(r != 0))
 397                         return r;
 398                 r = radeon_bo_pin(ring->ring_obj, RADEON_GEM_DOMAIN_GTT,
 399                                         &ring->gpu_addr);
 400                 if (r) {
 401                         radeon_bo_unreserve(ring->ring_obj);
 402                         dev_err(rdev->dev, "(%d) ring pin failed\n", r);
 403                         return r;
 404                 }
 405                 r = radeon_bo_kmap(ring->ring_obj,
 406                                        (void **)&ring->ring);
 407                 radeon_bo_unreserve(ring->ring_obj);
 408                 if (r) {
 409                         dev_err(rdev->dev, "(%d) ring map failed\n", r);
 410                         return r;
 411                 }
 412         }
 413         ring->ptr_mask = (ring->ring_size / 4) - 1;
 414         ring->ring_free_dw = ring->ring_size / 4;
 415         if (radeon_debugfs_ring_init(rdev, ring)) {
 416                 DRM_ERROR("Failed to register debugfs file for rings !\n");
 417         }
 418         return 0;
 419 }
 420
 421 void radeon_ring_fini(struct radeon_device *rdev, struct radeon_ring *ring)
 422 {
 423         int r;
 424         struct radeon_bo *ring_obj;
 425
 426         mutex_lock(&rdev->ring_lock);
 427         ring_obj = ring->ring_obj;
 428         ring->ready = false;
 429         ring->ring = NULL;
 430         ring->ring_obj = NULL;
 431         mutex_unlock(&rdev->ring_lock);
 432
 433         if (ring_obj) {
 434                 r = radeon_bo_reserve(ring_obj, false);
 435                 if (likely(r == 0)) {
 436                         radeon_bo_kunmap(ring_obj);
 437                         radeon_bo_unpin(ring_obj);
 438                         radeon_bo_unreserve(ring_obj);
 439                 }
 440                 radeon_bo_unref(&ring_obj);
 441         }
 442 }
 443
 444 /*
 445  * Debugfs info
 446  */
 447 #if defined(CONFIG_DEBUG_FS)
 448
 449 static int radeon_debugfs_ring_info(struct seq_file *m, void *data)
 450 {
 451         struct drm_info_node *node = (struct drm_info_node *) m->private;
 452         struct drm_device *dev = node->minor->dev;
 453         struct radeon_device *rdev = dev->dev_private;
 454         int ridx = *(int*)node->info_ent->data;
 455         struct radeon_ring *ring = &rdev->ring[ridx];
 456         unsigned count, i, j;
 457
 458         radeon_ring_free_size(rdev, ring);
 459         count = (ring->ring_size / 4) - ring->ring_free_dw;
 460         seq_printf(m, "wptr(0x%04x): 0x%08x\n", ring->wptr_reg, RREG32(ring->wptr_reg));
 461         seq_printf(m, "rptr(0x%04x): 0x%08x\n", ring->rptr_reg, RREG32(ring->rptr_reg));
 462         seq_printf(m, "driver's copy of the wptr: 0x%08x\n", ring->wptr);
 463         seq_printf(m, "driver's copy of the rptr: 0x%08x\n", ring->rptr);
 464         seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw);
 465         seq_printf(m, "%u dwords in ring\n", count);
 466         i = ring->rptr;
 467         for (j = 0; j <= count; j++) {
 468                 seq_printf(m, "r[%04d]=0x%08x\n", i, ring->ring[i]);
 469                 i = (i + 1) & ring->ptr_mask;
 470         }
 471         return 0;
 472 }
 473
 474 static int radeon_ring_type_gfx_index = RADEON_RING_TYPE_GFX_INDEX;
 475 static int cayman_ring_type_cp1_index = CAYMAN_RING_TYPE_CP1_INDEX;
 476 static int cayman_ring_type_cp2_index = CAYMAN_RING_TYPE_CP2_INDEX;
 477
 478 static struct drm_info_list radeon_debugfs_ring_info_list[] = {
 479         {"radeon_ring_gfx", radeon_debugfs_ring_info, 0, &radeon_ring_type_gfx_index},
 480         {"radeon_ring_cp1", radeon_debugfs_ring_info, 0, &cayman_ring_type_cp1_index},
 481         {"radeon_ring_cp2", radeon_debugfs_ring_info, 0, &cayman_ring_type_cp2_index},
 482 };
 483
 484 static int radeon_debugfs_sa_info(struct seq_file *m, void *data)
 485 {
 486         struct drm_info_node *node = (struct drm_info_node *) m->private;
 487         struct drm_device *dev = node->minor->dev;
 488         struct radeon_device *rdev = dev->dev_private;
 489
 490         radeon_sa_bo_dump_debug_info(&rdev->ring_tmp_bo, m);
 491
 492         return 0;
 493
 494 }
 495
 496 static struct drm_info_list radeon_debugfs_sa_list[] = {
 497         {"radeon_sa_info", &radeon_debugfs_sa_info, 0, NULL},
 498 };
 499
 500 #endif
 501
 502 int radeon_debugfs_ring_init(struct radeon_device *rdev, struct radeon_ring *ring)
 503 {
 504 #if defined(CONFIG_DEBUG_FS)
 505         unsigned i;
 506         for (i = 0; i < ARRAY_SIZE(radeon_debugfs_ring_info_list); ++i) {
 507                 struct drm_info_list *info = &radeon_debugfs_ring_info_list[i];
 508                 int ridx = *(int*)radeon_debugfs_ring_info_list[i].data;
 509                 unsigned r;
 510
 511                 if (&rdev->ring[ridx] != ring)
 512                         continue;
 513
 514                 r = radeon_debugfs_add_files(rdev, info, 1);
 515                 if (r)
 516                         return r;
 517         }
 518 #endif
 519         return 0;
 520 }
 521
 522 int radeon_debugfs_sa_init(struct radeon_device *rdev)
 523 {
 524 #if defined(CONFIG_DEBUG_FS)
 525         return radeon_debugfs_add_files(rdev, radeon_debugfs_sa_list, 1);
 526 #else
 527         return 0;
 528 #endif
 529 }