drivers/gpu/drm/amd/amdgpu/amdgpu_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 <linux/uaccess.h>
  32 #include <linux/debugfs.h>
  33
  34 #include <drm/amdgpu_drm.h>
  35 #include "amdgpu.h"
  36 #include "atom.h"
  37
  38 /*
  39  * Rings
  40  * Most engines on the GPU are fed via ring buffers.  Ring
  41  * buffers are areas of GPU accessible memory that the host
  42  * writes commands into and the GPU reads commands out of.
  43  * There is a rptr (read pointer) that determines where the
  44  * GPU is currently reading, and a wptr (write pointer)
  45  * which determines where the host has written.  When the
  46  * pointers are equal, the ring is idle.  When the host
  47  * writes commands to the ring buffer, it increments the
  48  * wptr.  The GPU then starts fetching commands and executes
  49  * them until the pointers are equal again.
  50  */
  51
  52 /**
  53  * amdgpu_ring_alloc - allocate space on the ring buffer
  54  *
  55  * @ring: amdgpu_ring structure holding ring information
  56  * @ndw: number of dwords to allocate in the ring buffer
  57  *
  58  * Allocate @ndw dwords in the ring buffer (all asics).
  59  * Returns 0 on success, error on failure.
  60  */
  61 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw)
  62 {
  63         /* Align requested size with padding so unlock_commit can
  64          * pad safely */
  65         ndw = (ndw + ring->funcs->align_mask) & ~ring->funcs->align_mask;
  66
  67         /* Make sure we aren't trying to allocate more space
  68          * than the maximum for one submission
  69          */
  70         if (WARN_ON_ONCE(ndw > ring->max_dw))
  71                 return -ENOMEM;
  72
  73         ring->count_dw = ndw;
  74         ring->wptr_old = ring->wptr;
  75
  76         if (ring->funcs->begin_use)
  77                 ring->funcs->begin_use(ring);
  78
  79         return 0;
  80 }
  81
  82 /** amdgpu_ring_insert_nop - insert NOP packets
  83  *
  84  * @ring: amdgpu_ring structure holding ring information
  85  * @count: the number of NOP packets to insert
  86  *
  87  * This is the generic insert_nop function for rings except SDMA
  88  */
  89 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
  90 {
  91         int i;
  92
  93         for (i = 0; i < count; i++)
  94                 amdgpu_ring_write(ring, ring->funcs->nop);
  95 }
  96
  97 /**
  98  * amdgpu_ring_generic_pad_ib - pad IB with NOP packets
  99  *
 100  * @ring: amdgpu_ring structure holding ring information
 101  * @ib: IB to add NOP packets to
 102  *
 103  * This is the generic pad_ib function for rings except SDMA
 104  */
 105 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
 106 {
 107         while (ib->length_dw & ring->funcs->align_mask)
 108                 ib->ptr[ib->length_dw++] = ring->funcs->nop;
 109 }
 110
 111 /**
 112  * amdgpu_ring_commit - tell the GPU to execute the new
 113  * commands on the ring buffer
 114  *
 115  * @ring: amdgpu_ring structure holding ring information
 116  *
 117  * Update the wptr (write pointer) to tell the GPU to
 118  * execute new commands on the ring buffer (all asics).
 119  */
 120 void amdgpu_ring_commit(struct amdgpu_ring *ring)
 121 {
 122         uint32_t count;
 123
 124         /* We pad to match fetch size */
 125         count = ring->funcs->align_mask + 1 -
 126                 (ring->wptr & ring->funcs->align_mask);
 127         count %= ring->funcs->align_mask + 1;
 128         ring->funcs->insert_nop(ring, count);
 129
 130         mb();
 131         amdgpu_ring_set_wptr(ring);
 132
 133         if (ring->funcs->end_use)
 134                 ring->funcs->end_use(ring);
 135 }
 136
 137 /**
 138  * amdgpu_ring_undo - reset the wptr
 139  *
 140  * @ring: amdgpu_ring structure holding ring information
 141  *
 142  * Reset the driver's copy of the wptr (all asics).
 143  */
 144 void amdgpu_ring_undo(struct amdgpu_ring *ring)
 145 {
 146         ring->wptr = ring->wptr_old;
 147
 148         if (ring->funcs->end_use)
 149                 ring->funcs->end_use(ring);
 150 }
 151
 152 #define amdgpu_ring_get_gpu_addr(ring, offset)                          \
 153         (ring->is_mes_queue ?                                           \
 154          (ring->mes_ctx->meta_data_gpu_addr + offset) :                 \
 155          (ring->adev->wb.gpu_addr + offset * 4))
 156
 157 #define amdgpu_ring_get_cpu_addr(ring, offset)                          \
 158         (ring->is_mes_queue ?                                           \
 159          (void *)((uint8_t *)(ring->mes_ctx->meta_data_ptr) + offset) : \
 160          (&ring->adev->wb.wb[offset]))
 161
 162 /**
 163  * amdgpu_ring_init - init driver ring struct.
 164  *
 165  * @adev: amdgpu_device pointer
 166  * @ring: amdgpu_ring structure holding ring information
 167  * @max_dw: maximum number of dw for ring alloc
 168  * @irq_src: interrupt source to use for this ring
 169  * @irq_type: interrupt type to use for this ring
 170  * @hw_prio: ring priority (NORMAL/HIGH)
 171  * @sched_score: optional score atomic shared with other schedulers
 172  *
 173  * Initialize the driver information for the selected ring (all asics).
 174  * Returns 0 on success, error on failure.
 175  */
 176 int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
 177                      unsigned int max_dw, struct amdgpu_irq_src *irq_src,
 178                      unsigned int irq_type, unsigned int hw_prio,
 179                      atomic_t *sched_score)
 180 {
 181         int r;
 182         int sched_hw_submission = amdgpu_sched_hw_submission;
 183         u32 *num_sched;
 184         u32 hw_ip;
 185
 186         /* Set the hw submission limit higher for KIQ because
 187          * it's used for a number of gfx/compute tasks by both
 188          * KFD and KGD which may have outstanding fences and
 189          * it doesn't really use the gpu scheduler anyway;
 190          * KIQ tasks get submitted directly to the ring.
 191          */
 192         if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
 193                 sched_hw_submission = max(sched_hw_submission, 256);
 194         else if (ring == &adev->sdma.instance[0].page)
 195                 sched_hw_submission = 256;
 196
 197         if (ring->adev == NULL) {
 198                 if (adev->num_rings >= AMDGPU_MAX_RINGS)
 199                         return -EINVAL;
 200
 201                 ring->adev = adev;
 202                 ring->num_hw_submission = sched_hw_submission;
 203                 ring->sched_score = sched_score;
 204                 ring->vmid_wait = dma_fence_get_stub();
 205
 206                 if (!ring->is_mes_queue) {
 207                         ring->idx = adev->num_rings++;
 208                         adev->rings[ring->idx] = ring;
 209                 }
 210
 211                 r = amdgpu_fence_driver_init_ring(ring);
 212                 if (r)
 213                         return r;
 214         }
 215
 216         if (ring->is_mes_queue) {
 217                 ring->rptr_offs = amdgpu_mes_ctx_get_offs(ring,
 218                                 AMDGPU_MES_CTX_RPTR_OFFS);
 219                 ring->wptr_offs = amdgpu_mes_ctx_get_offs(ring,
 220                                 AMDGPU_MES_CTX_WPTR_OFFS);
 221                 ring->fence_offs = amdgpu_mes_ctx_get_offs(ring,
 222                                 AMDGPU_MES_CTX_FENCE_OFFS);
 223                 ring->trail_fence_offs = amdgpu_mes_ctx_get_offs(ring,
 224                                 AMDGPU_MES_CTX_TRAIL_FENCE_OFFS);
 225                 ring->cond_exe_offs = amdgpu_mes_ctx_get_offs(ring,
 226                                 AMDGPU_MES_CTX_COND_EXE_OFFS);
 227         } else {
 228                 r = amdgpu_device_wb_get(adev, &ring->rptr_offs);
 229                 if (r) {
 230                         dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
 231                         return r;
 232                 }
 233
 234                 r = amdgpu_device_wb_get(adev, &ring->wptr_offs);
 235                 if (r) {
 236                         dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
 237                         return r;
 238                 }
 239
 240                 r = amdgpu_device_wb_get(adev, &ring->fence_offs);
 241                 if (r) {
 242                         dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
 243                         return r;
 244                 }
 245
 246                 r = amdgpu_device_wb_get(adev, &ring->trail_fence_offs);
 247                 if (r) {
 248                         dev_err(adev->dev, "(%d) ring trail_fence_offs wb alloc failed\n", r);
 249                         return r;
 250                 }
 251
 252                 r = amdgpu_device_wb_get(adev, &ring->cond_exe_offs);
 253                 if (r) {
 254                         dev_err(adev->dev, "(%d) ring cond_exec_polling wb alloc failed\n", r);
 255                         return r;
 256                 }
 257         }
 258
 259         ring->fence_gpu_addr =
 260                 amdgpu_ring_get_gpu_addr(ring, ring->fence_offs);
 261         ring->fence_cpu_addr =
 262                 amdgpu_ring_get_cpu_addr(ring, ring->fence_offs);
 263
 264         ring->rptr_gpu_addr =
 265                 amdgpu_ring_get_gpu_addr(ring, ring->rptr_offs);
 266         ring->rptr_cpu_addr =
 267                 amdgpu_ring_get_cpu_addr(ring, ring->rptr_offs);
 268
 269         ring->wptr_gpu_addr =
 270                 amdgpu_ring_get_gpu_addr(ring, ring->wptr_offs);
 271         ring->wptr_cpu_addr =
 272                 amdgpu_ring_get_cpu_addr(ring, ring->wptr_offs);
 273
 274         ring->trail_fence_gpu_addr =
 275                 amdgpu_ring_get_gpu_addr(ring, ring->trail_fence_offs);
 276         ring->trail_fence_cpu_addr =
 277                 amdgpu_ring_get_cpu_addr(ring, ring->trail_fence_offs);
 278
 279         ring->cond_exe_gpu_addr =
 280                 amdgpu_ring_get_gpu_addr(ring, ring->cond_exe_offs);
 281         ring->cond_exe_cpu_addr =
 282                 amdgpu_ring_get_cpu_addr(ring, ring->cond_exe_offs);
 283
 284         /* always set cond_exec_polling to CONTINUE */
 285         *ring->cond_exe_cpu_addr = 1;
 286
 287         r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);
 288         if (r) {
 289                 dev_err(adev->dev, "failed initializing fences (%d).\n", r);
 290                 return r;
 291         }
 292
 293         ring->ring_size = roundup_pow_of_two(max_dw * 4 * sched_hw_submission);
 294
 295         ring->buf_mask = (ring->ring_size / 4) - 1;
 296         ring->ptr_mask = ring->funcs->support_64bit_ptrs ?
 297                 0xffffffffffffffff : ring->buf_mask;
 298
 299         /* Allocate ring buffer */
 300         if (ring->is_mes_queue) {
 301                 int offset = 0;
 302
 303                 BUG_ON(ring->ring_size > PAGE_SIZE*4);
 304
 305                 offset = amdgpu_mes_ctx_get_offs(ring,
 306                                          AMDGPU_MES_CTX_RING_OFFS);
 307                 ring->gpu_addr = amdgpu_mes_ctx_get_offs_gpu_addr(ring, offset);
 308                 ring->ring = amdgpu_mes_ctx_get_offs_cpu_addr(ring, offset);
 309                 amdgpu_ring_clear_ring(ring);
 310
 311         } else if (ring->ring_obj == NULL) {
 312                 r = amdgpu_bo_create_kernel(adev, ring->ring_size + ring->funcs->extra_dw, PAGE_SIZE,
 313                                             AMDGPU_GEM_DOMAIN_GTT,
 314                                             &ring->ring_obj,
 315                                             &ring->gpu_addr,
 316                                             (void **)&ring->ring);
 317                 if (r) {
 318                         dev_err(adev->dev, "(%d) ring create failed\n", r);
 319                         return r;
 320                 }
 321                 amdgpu_ring_clear_ring(ring);
 322         }
 323
 324         ring->max_dw = max_dw;
 325         ring->hw_prio = hw_prio;
 326
 327         if (!ring->no_scheduler) {
 328                 hw_ip = ring->funcs->type;
 329                 num_sched = &adev->gpu_sched[hw_ip][hw_prio].num_scheds;
 330                 adev->gpu_sched[hw_ip][hw_prio].sched[(*num_sched)++] =
 331                         &ring->sched;
 332         }
 333
 334         return 0;
 335 }
 336
 337 /**
 338  * amdgpu_ring_fini - tear down the driver ring struct.
 339  *
 340  * @ring: amdgpu_ring structure holding ring information
 341  *
 342  * Tear down the driver information for the selected ring (all asics).
 343  */
 344 void amdgpu_ring_fini(struct amdgpu_ring *ring)
 345 {
 346
 347         /* Not to finish a ring which is not initialized */
 348         if (!(ring->adev) ||
 349             (!ring->is_mes_queue && !(ring->adev->rings[ring->idx])))
 350                 return;
 351
 352         ring->sched.ready = false;
 353
 354         if (!ring->is_mes_queue) {
 355                 amdgpu_device_wb_free(ring->adev, ring->rptr_offs);
 356                 amdgpu_device_wb_free(ring->adev, ring->wptr_offs);
 357
 358                 amdgpu_device_wb_free(ring->adev, ring->cond_exe_offs);
 359                 amdgpu_device_wb_free(ring->adev, ring->fence_offs);
 360
 361                 amdgpu_bo_free_kernel(&ring->ring_obj,
 362                                       &ring->gpu_addr,
 363                                       (void **)&ring->ring);
 364         }
 365
 366         dma_fence_put(ring->vmid_wait);
 367         ring->vmid_wait = NULL;
 368         ring->me = 0;
 369
 370         if (!ring->is_mes_queue)
 371                 ring->adev->rings[ring->idx] = NULL;
 372 }
 373
 374 /**
 375  * amdgpu_ring_emit_reg_write_reg_wait_helper - ring helper
 376  *
 377  * @ring: ring to write to
 378  * @reg0: register to write
 379  * @reg1: register to wait on
 380  * @ref: reference value to write/wait on
 381  * @mask: mask to wait on
 382  *
 383  * Helper for rings that don't support write and wait in a
 384  * single oneshot packet.
 385  */
 386 void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
 387                                                 uint32_t reg0, uint32_t reg1,
 388                                                 uint32_t ref, uint32_t mask)
 389 {
 390         amdgpu_ring_emit_wreg(ring, reg0, ref);
 391         amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);
 392 }
 393
 394 /**
 395  * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
 396  *
 397  * @ring: ring to try the recovery on
 398  * @vmid: VMID we try to get going again
 399  * @fence: timedout fence
 400  *
 401  * Tries to get a ring proceeding again when it is stuck.
 402  */
 403 bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
 404                                struct dma_fence *fence)
 405 {
 406         ktime_t deadline = ktime_add_us(ktime_get(), 10000);
 407
 408         if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)
 409                 return false;
 410
 411         atomic_inc(&ring->adev->gpu_reset_counter);
 412         while (!dma_fence_is_signaled(fence) &&
 413                ktime_to_ns(ktime_sub(deadline, ktime_get())) > 0)
 414                 ring->funcs->soft_recovery(ring, vmid);
 415
 416         return dma_fence_is_signaled(fence);
 417 }
 418
 419 /*
 420  * Debugfs info
 421  */
 422 #if defined(CONFIG_DEBUG_FS)
 423
 424 /* Layout of file is 12 bytes consisting of
 425  * - rptr
 426  * - wptr
 427  * - driver's copy of wptr
 428  *
 429  * followed by n-words of ring data
 430  */
 431 static ssize_t amdgpu_debugfs_ring_read(struct file *f, char __user *buf,
 432                                         size_t size, loff_t *pos)
 433 {
 434         struct amdgpu_ring *ring = file_inode(f)->i_private;
 435         int r, i;
 436         uint32_t value, result, early[3];
 437
 438         if (*pos & 3 || size & 3)
 439                 return -EINVAL;
 440
 441         result = 0;
 442
 443         if (*pos < 12) {
 444                 early[0] = amdgpu_ring_get_rptr(ring) & ring->buf_mask;
 445                 early[1] = amdgpu_ring_get_wptr(ring) & ring->buf_mask;
 446                 early[2] = ring->wptr & ring->buf_mask;
 447                 for (i = *pos / 4; i < 3 && size; i++) {
 448                         r = put_user(early[i], (uint32_t *)buf);
 449                         if (r)
 450                                 return r;
 451                         buf += 4;
 452                         result += 4;
 453                         size -= 4;
 454                         *pos += 4;
 455                 }
 456         }
 457
 458         while (size) {
 459                 if (*pos >= (ring->ring_size + 12))
 460                         return result;
 461
 462                 value = ring->ring[(*pos - 12)/4];
 463                 r = put_user(value, (uint32_t *)buf);
 464                 if (r)
 465                         return r;
 466                 buf += 4;
 467                 result += 4;
 468                 size -= 4;
 469                 *pos += 4;
 470         }
 471
 472         return result;
 473 }
 474
 475 static const struct file_operations amdgpu_debugfs_ring_fops = {
 476         .owner = THIS_MODULE,
 477         .read = amdgpu_debugfs_ring_read,
 478         .llseek = default_llseek
 479 };
 480
 481 #endif
 482
 483 void amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
 484                               struct amdgpu_ring *ring)
 485 {
 486 #if defined(CONFIG_DEBUG_FS)
 487         struct drm_minor *minor = adev_to_drm(adev)->primary;
 488         struct dentry *root = minor->debugfs_root;
 489         char name[32];
 490
 491         sprintf(name, "amdgpu_ring_%s", ring->name);
 492         debugfs_create_file_size(name, S_IFREG | S_IRUGO, root, ring,
 493                                  &amdgpu_debugfs_ring_fops,
 494                                  ring->ring_size + 12);
 495
 496 #endif
 497 }
 498
 499 /**
 500  * amdgpu_ring_test_helper - tests ring and set sched readiness status
 501  *
 502  * @ring: ring to try the recovery on
 503  *
 504  * Tests ring and set sched readiness status
 505  *
 506  * Returns 0 on success, error on failure.
 507  */
 508 int amdgpu_ring_test_helper(struct amdgpu_ring *ring)
 509 {
 510         struct amdgpu_device *adev = ring->adev;
 511         int r;
 512
 513         r = amdgpu_ring_test_ring(ring);
 514         if (r)
 515                 DRM_DEV_ERROR(adev->dev, "ring %s test failed (%d)\n",
 516                               ring->name, r);
 517         else
 518                 DRM_DEV_DEBUG(adev->dev, "ring test on %s succeeded\n",
 519                               ring->name);
 520
 521         ring->sched.ready = !r;
 522         return r;
 523 }
 524
 525 static void amdgpu_ring_to_mqd_prop(struct amdgpu_ring *ring,
 526                                     struct amdgpu_mqd_prop *prop)
 527 {
 528         struct amdgpu_device *adev = ring->adev;
 529
 530         memset(prop, 0, sizeof(*prop));
 531
 532         prop->mqd_gpu_addr = ring->mqd_gpu_addr;
 533         prop->hqd_base_gpu_addr = ring->gpu_addr;
 534         prop->rptr_gpu_addr = ring->rptr_gpu_addr;
 535         prop->wptr_gpu_addr = ring->wptr_gpu_addr;
 536         prop->queue_size = ring->ring_size;
 537         prop->eop_gpu_addr = ring->eop_gpu_addr;
 538         prop->use_doorbell = ring->use_doorbell;
 539         prop->doorbell_index = ring->doorbell_index;
 540
 541         /* map_queues packet doesn't need activate the queue,
 542          * so only kiq need set this field.
 543          */
 544         prop->hqd_active = ring->funcs->type == AMDGPU_RING_TYPE_KIQ;
 545
 546         if (ring->funcs->type == AMDGPU_RING_TYPE_COMPUTE) {
 547                 if (amdgpu_gfx_is_high_priority_compute_queue(adev, ring)) {
 548                         prop->hqd_pipe_priority = AMDGPU_GFX_PIPE_PRIO_HIGH;
 549                         prop->hqd_queue_priority =
 550                                 AMDGPU_GFX_QUEUE_PRIORITY_MAXIMUM;
 551                 }
 552         }
 553 }
 554
 555 int amdgpu_ring_init_mqd(struct amdgpu_ring *ring)
 556 {
 557         struct amdgpu_device *adev = ring->adev;
 558         struct amdgpu_mqd *mqd_mgr;
 559         struct amdgpu_mqd_prop prop;
 560
 561         amdgpu_ring_to_mqd_prop(ring, &prop);
 562
 563         ring->wptr = 0;
 564
 565         if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
 566                 mqd_mgr = &adev->mqds[AMDGPU_HW_IP_COMPUTE];
 567         else
 568                 mqd_mgr = &adev->mqds[ring->funcs->type];
 569
 570         return mqd_mgr->init_mqd(adev, ring->mqd_ptr, &prop);
 571 }