drivers/gpu/drm/etnaviv/etnaviv_buffer.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2014-2018 Etnaviv Project
   4  */
   5
   6 #include <drm/drm_drv.h>
   7
   8 #include "etnaviv_cmdbuf.h"
   9 #include "etnaviv_gpu.h"
  10 #include "etnaviv_gem.h"
  11 #include "etnaviv_mmu.h"
  12
  13 #include "common.xml.h"
  14 #include "state.xml.h"
  15 #include "state_blt.xml.h"
  16 #include "state_hi.xml.h"
  17 #include "state_3d.xml.h"
  18 #include "cmdstream.xml.h"
  19
  20 /*
  21  * Command Buffer helper:
  22  */
  23
  24
  25 static inline void OUT(struct etnaviv_cmdbuf *buffer, u32 data)
  26 {
  27         u32 *vaddr = (u32 *)buffer->vaddr;
  28
  29         BUG_ON(buffer->user_size >= buffer->size);
  30
  31         vaddr[buffer->user_size / 4] = data;
  32         buffer->user_size += 4;
  33 }
  34
  35 static inline void CMD_LOAD_STATE(struct etnaviv_cmdbuf *buffer,
  36         u32 reg, u32 value)
  37 {
  38         u32 index = reg >> VIV_FE_LOAD_STATE_HEADER_OFFSET__SHR;
  39
  40         buffer->user_size = ALIGN(buffer->user_size, 8);
  41
  42         /* write a register via cmd stream */
  43         OUT(buffer, VIV_FE_LOAD_STATE_HEADER_OP_LOAD_STATE |
  44                     VIV_FE_LOAD_STATE_HEADER_COUNT(1) |
  45                     VIV_FE_LOAD_STATE_HEADER_OFFSET(index));
  46         OUT(buffer, value);
  47 }
  48
  49 static inline void CMD_END(struct etnaviv_cmdbuf *buffer)
  50 {
  51         buffer->user_size = ALIGN(buffer->user_size, 8);
  52
  53         OUT(buffer, VIV_FE_END_HEADER_OP_END);
  54 }
  55
  56 static inline void CMD_WAIT(struct etnaviv_cmdbuf *buffer)
  57 {
  58         buffer->user_size = ALIGN(buffer->user_size, 8);
  59
  60         OUT(buffer, VIV_FE_WAIT_HEADER_OP_WAIT | 200);
  61 }
  62
  63 static inline void CMD_LINK(struct etnaviv_cmdbuf *buffer,
  64         u16 prefetch, u32 address)
  65 {
  66         buffer->user_size = ALIGN(buffer->user_size, 8);
  67
  68         OUT(buffer, VIV_FE_LINK_HEADER_OP_LINK |
  69                     VIV_FE_LINK_HEADER_PREFETCH(prefetch));
  70         OUT(buffer, address);
  71 }
  72
  73 static inline void CMD_STALL(struct etnaviv_cmdbuf *buffer,
  74         u32 from, u32 to)
  75 {
  76         buffer->user_size = ALIGN(buffer->user_size, 8);
  77
  78         OUT(buffer, VIV_FE_STALL_HEADER_OP_STALL);
  79         OUT(buffer, VIV_FE_STALL_TOKEN_FROM(from) | VIV_FE_STALL_TOKEN_TO(to));
  80 }
  81
  82 static inline void CMD_SEM(struct etnaviv_cmdbuf *buffer, u32 from, u32 to)
  83 {
  84         CMD_LOAD_STATE(buffer, VIVS_GL_SEMAPHORE_TOKEN,
  85                        VIVS_GL_SEMAPHORE_TOKEN_FROM(from) |
  86                        VIVS_GL_SEMAPHORE_TOKEN_TO(to));
  87 }
  88
  89 static void etnaviv_cmd_select_pipe(struct etnaviv_gpu *gpu,
  90         struct etnaviv_cmdbuf *buffer, u8 pipe)
  91 {
  92         u32 flush = 0;
  93
  94         lockdep_assert_held(&gpu->lock);
  95
  96         /*
  97          * This assumes that if we're switching to 2D, we're switching
  98          * away from 3D, and vice versa.  Hence, if we're switching to
  99          * the 2D core, we need to flush the 3D depth and color caches,
 100          * otherwise we need to flush the 2D pixel engine cache.
 101          */
 102         if (gpu->exec_state == ETNA_PIPE_2D)
 103                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 104         else if (gpu->exec_state == ETNA_PIPE_3D)
 105                 flush = VIVS_GL_FLUSH_CACHE_DEPTH | VIVS_GL_FLUSH_CACHE_COLOR;
 106
 107         CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 108         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 109         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 110
 111         CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 112                        VIVS_GL_PIPE_SELECT_PIPE(pipe));
 113 }
 114
 115 static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
 116         struct etnaviv_cmdbuf *buf, u32 off, u32 len)
 117 {
 118         u32 size = buf->size;
 119         u32 *ptr = buf->vaddr + off;
 120
 121         dev_info(gpu->dev, "virt %p phys 0x%08x free 0x%08x\n",
 122                         ptr, etnaviv_cmdbuf_get_va(buf,
 123                         &gpu->mmu_context->cmdbuf_mapping) +
 124                         off, size - len * 4 - off);
 125
 126         print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 127                         ptr, len * 4, 0);
 128 }
 129
 130 /*
 131  * Safely replace the WAIT of a waitlink with a new command and argument.
 132  * The GPU may be executing this WAIT while we're modifying it, so we have
 133  * to write it in a specific order to avoid the GPU branching to somewhere
 134  * else.  'wl_offset' is the offset to the first byte of the WAIT command.
 135  */
 136 static void etnaviv_buffer_replace_wait(struct etnaviv_cmdbuf *buffer,
 137         unsigned int wl_offset, u32 cmd, u32 arg)
 138 {
 139         u32 *lw = buffer->vaddr + wl_offset;
 140
 141         lw[1] = arg;
 142         mb();
 143         lw[0] = cmd;
 144         mb();
 145 }
 146
 147 /*
 148  * Ensure that there is space in the command buffer to contiguously write
 149  * 'cmd_dwords' 64-bit words into the buffer, wrapping if necessary.
 150  */
 151 static u32 etnaviv_buffer_reserve(struct etnaviv_gpu *gpu,
 152         struct etnaviv_cmdbuf *buffer, unsigned int cmd_dwords)
 153 {
 154         if (buffer->user_size + cmd_dwords * sizeof(u64) > buffer->size)
 155                 buffer->user_size = 0;
 156
 157         return etnaviv_cmdbuf_get_va(buffer,
 158                                      &gpu->mmu_context->cmdbuf_mapping) +
 159                buffer->user_size;
 160 }
 161
 162 u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
 163 {
 164         struct etnaviv_cmdbuf *buffer = &gpu->buffer;
 165
 166         lockdep_assert_held(&gpu->lock);
 167
 168         /* initialize buffer */
 169         buffer->user_size = 0;
 170
 171         CMD_WAIT(buffer);
 172         CMD_LINK(buffer, 2,
 173                  etnaviv_cmdbuf_get_va(buffer, &gpu->mmu_context->cmdbuf_mapping)
 174                  + buffer->user_size - 4);
 175
 176         return buffer->user_size / 8;
 177 }
 178
 179 u16 etnaviv_buffer_config_mmuv2(struct etnaviv_gpu *gpu, u32 mtlb_addr, u32 safe_addr)
 180 {
 181         struct etnaviv_cmdbuf *buffer = &gpu->buffer;
 182
 183         lockdep_assert_held(&gpu->lock);
 184
 185         buffer->user_size = 0;
 186
 187         if (gpu->identity.features & chipFeatures_PIPE_3D) {
 188                 CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 189                                VIVS_GL_PIPE_SELECT_PIPE(ETNA_PIPE_3D));
 190                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_CONFIGURATION,
 191                         mtlb_addr | VIVS_MMUv2_CONFIGURATION_MODE_MODE4_K);
 192                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_SAFE_ADDRESS, safe_addr);
 193                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 194                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 195         }
 196
 197         if (gpu->identity.features & chipFeatures_PIPE_2D) {
 198                 CMD_LOAD_STATE(buffer, VIVS_GL_PIPE_SELECT,
 199                                VIVS_GL_PIPE_SELECT_PIPE(ETNA_PIPE_2D));
 200                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_CONFIGURATION,
 201                         mtlb_addr | VIVS_MMUv2_CONFIGURATION_MODE_MODE4_K);
 202                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_SAFE_ADDRESS, safe_addr);
 203                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 204                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 205         }
 206
 207         CMD_END(buffer);
 208
 209         buffer->user_size = ALIGN(buffer->user_size, 8);
 210
 211         return buffer->user_size / 8;
 212 }
 213
 214 u16 etnaviv_buffer_config_pta(struct etnaviv_gpu *gpu, unsigned short id)
 215 {
 216         struct etnaviv_cmdbuf *buffer = &gpu->buffer;
 217
 218         lockdep_assert_held(&gpu->lock);
 219
 220         buffer->user_size = 0;
 221
 222         CMD_LOAD_STATE(buffer, VIVS_MMUv2_PTA_CONFIG,
 223                        VIVS_MMUv2_PTA_CONFIG_INDEX(id));
 224
 225         CMD_END(buffer);
 226
 227         buffer->user_size = ALIGN(buffer->user_size, 8);
 228
 229         return buffer->user_size / 8;
 230 }
 231
 232 void etnaviv_buffer_end(struct etnaviv_gpu *gpu)
 233 {
 234         struct etnaviv_cmdbuf *buffer = &gpu->buffer;
 235         unsigned int waitlink_offset = buffer->user_size - 16;
 236         u32 link_target, flush = 0;
 237         bool has_blt = !!(gpu->identity.minor_features5 &
 238                           chipMinorFeatures5_BLT_ENGINE);
 239
 240         lockdep_assert_held(&gpu->lock);
 241
 242         if (gpu->exec_state == ETNA_PIPE_2D)
 243                 flush = VIVS_GL_FLUSH_CACHE_PE2D;
 244         else if (gpu->exec_state == ETNA_PIPE_3D)
 245                 flush = VIVS_GL_FLUSH_CACHE_DEPTH |
 246                         VIVS_GL_FLUSH_CACHE_COLOR |
 247                         VIVS_GL_FLUSH_CACHE_TEXTURE |
 248                         VIVS_GL_FLUSH_CACHE_TEXTUREVS |
 249                         VIVS_GL_FLUSH_CACHE_SHADER_L2;
 250
 251         if (flush) {
 252                 unsigned int dwords = 7;
 253
 254                 if (has_blt)
 255                         dwords += 10;
 256
 257                 link_target = etnaviv_buffer_reserve(gpu, buffer, dwords);
 258
 259                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 260                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 261                 if (has_blt) {
 262                         CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x1);
 263                         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_BLT);
 264                         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_BLT);
 265                         CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x0);
 266                 }
 267                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE, flush);
 268                 if (gpu->exec_state == ETNA_PIPE_3D) {
 269                         if (has_blt) {
 270                                 CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x1);
 271                                 CMD_LOAD_STATE(buffer, VIVS_BLT_SET_COMMAND, 0x1);
 272                                 CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x0);
 273                         } else {
 274                                 CMD_LOAD_STATE(buffer, VIVS_TS_FLUSH_CACHE,
 275                                                VIVS_TS_FLUSH_CACHE_FLUSH);
 276                         }
 277                 }
 278                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 279                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 280                 if (has_blt) {
 281                         CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x1);
 282                         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_BLT);
 283                         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_BLT);
 284                         CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x0);
 285                 }
 286                 CMD_END(buffer);
 287
 288                 etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 289                                             VIV_FE_LINK_HEADER_OP_LINK |
 290                                             VIV_FE_LINK_HEADER_PREFETCH(dwords),
 291                                             link_target);
 292         } else {
 293                 /* Replace the last link-wait with an "END" command */
 294                 etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 295                                             VIV_FE_END_HEADER_OP_END, 0);
 296         }
 297 }
 298
 299 /* Append a 'sync point' to the ring buffer. */
 300 void etnaviv_sync_point_queue(struct etnaviv_gpu *gpu, unsigned int event)
 301 {
 302         struct etnaviv_cmdbuf *buffer = &gpu->buffer;
 303         unsigned int waitlink_offset = buffer->user_size - 16;
 304         u32 dwords, target;
 305
 306         lockdep_assert_held(&gpu->lock);
 307
 308         /*
 309          * We need at most 3 dwords in the return target:
 310          * 1 event + 1 end + 1 wait + 1 link.
 311          */
 312         dwords = 4;
 313         target = etnaviv_buffer_reserve(gpu, buffer, dwords);
 314
 315         /* Signal sync point event */
 316         CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
 317                        VIVS_GL_EVENT_FROM_PE);
 318
 319         /* Stop the FE to 'pause' the GPU */
 320         CMD_END(buffer);
 321
 322         /* Append waitlink */
 323         CMD_WAIT(buffer);
 324         CMD_LINK(buffer, 2,
 325                  etnaviv_cmdbuf_get_va(buffer, &gpu->mmu_context->cmdbuf_mapping)
 326                  + buffer->user_size - 4);
 327
 328         /*
 329          * Kick off the 'sync point' command by replacing the previous
 330          * WAIT with a link to the address in the ring buffer.
 331          */
 332         etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 333                                     VIV_FE_LINK_HEADER_OP_LINK |
 334                                     VIV_FE_LINK_HEADER_PREFETCH(dwords),
 335                                     target);
 336 }
 337
 338 /* Append a command buffer to the ring buffer. */
 339 void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state,
 340         struct etnaviv_iommu_context *mmu_context, unsigned int event,
 341         struct etnaviv_cmdbuf *cmdbuf)
 342 {
 343         struct etnaviv_cmdbuf *buffer = &gpu->buffer;
 344         unsigned int waitlink_offset = buffer->user_size - 16;
 345         u32 return_target, return_dwords;
 346         u32 link_target, link_dwords;
 347         bool switch_context = gpu->exec_state != exec_state;
 348         bool switch_mmu_context = gpu->mmu_context != mmu_context;
 349         unsigned int new_flush_seq = READ_ONCE(gpu->mmu_context->flush_seq);
 350         bool need_flush = switch_mmu_context || gpu->flush_seq != new_flush_seq;
 351         bool has_blt = !!(gpu->identity.minor_features5 &
 352                           chipMinorFeatures5_BLT_ENGINE);
 353
 354         lockdep_assert_held(&gpu->lock);
 355
 356         if (drm_debug_enabled(DRM_UT_DRIVER))
 357                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 358
 359         link_target = etnaviv_cmdbuf_get_va(cmdbuf,
 360                                             &gpu->mmu_context->cmdbuf_mapping);
 361         link_dwords = cmdbuf->size / 8;
 362
 363         /*
 364          * If we need maintenance prior to submitting this buffer, we will
 365          * need to append a mmu flush load state, followed by a new
 366          * link to this buffer - a total of four additional words.
 367          */
 368         if (need_flush || switch_context) {
 369                 u32 target, extra_dwords;
 370
 371                 /* link command */
 372                 extra_dwords = 1;
 373
 374                 /* flush command */
 375                 if (need_flush) {
 376                         if (gpu->mmu_context->global->version == ETNAVIV_IOMMU_V1)
 377                                 extra_dwords += 1;
 378                         else
 379                                 extra_dwords += 3;
 380                 }
 381
 382                 /* pipe switch commands */
 383                 if (switch_context)
 384                         extra_dwords += 4;
 385
 386                 /* PTA load command */
 387                 if (switch_mmu_context && gpu->sec_mode == ETNA_SEC_KERNEL)
 388                         extra_dwords += 1;
 389
 390                 target = etnaviv_buffer_reserve(gpu, buffer, extra_dwords);
 391                 /*
 392                  * Switch MMU context if necessary. Must be done after the
 393                  * link target has been calculated, as the jump forward in the
 394                  * kernel ring still uses the last active MMU context before
 395                  * the switch.
 396                  */
 397                 if (switch_mmu_context) {
 398                         struct etnaviv_iommu_context *old_context = gpu->mmu_context;
 399
 400                         gpu->mmu_context = etnaviv_iommu_context_get(mmu_context);
 401                         etnaviv_iommu_context_put(old_context);
 402                 }
 403
 404                 if (need_flush) {
 405                         /* Add the MMU flush */
 406                         if (gpu->mmu_context->global->version == ETNAVIV_IOMMU_V1) {
 407                                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU,
 408                                                VIVS_GL_FLUSH_MMU_FLUSH_FEMMU |
 409                                                VIVS_GL_FLUSH_MMU_FLUSH_UNK1 |
 410                                                VIVS_GL_FLUSH_MMU_FLUSH_UNK2 |
 411                                                VIVS_GL_FLUSH_MMU_FLUSH_PEMMU |
 412                                                VIVS_GL_FLUSH_MMU_FLUSH_UNK4);
 413                         } else {
 414                                 u32 flush = VIVS_MMUv2_CONFIGURATION_MODE_MASK |
 415                                             VIVS_MMUv2_CONFIGURATION_FLUSH_FLUSH;
 416
 417                                 if (switch_mmu_context &&
 418                                     gpu->sec_mode == ETNA_SEC_KERNEL) {
 419                                         unsigned short id =
 420                                                 etnaviv_iommuv2_get_pta_id(gpu->mmu_context);
 421                                         CMD_LOAD_STATE(buffer,
 422                                                 VIVS_MMUv2_PTA_CONFIG,
 423                                                 VIVS_MMUv2_PTA_CONFIG_INDEX(id));
 424                                 }
 425
 426                                 if (gpu->sec_mode == ETNA_SEC_NONE)
 427                                         flush |= etnaviv_iommuv2_get_mtlb_addr(gpu->mmu_context);
 428
 429                                 CMD_LOAD_STATE(buffer, VIVS_MMUv2_CONFIGURATION,
 430                                                flush);
 431                                 CMD_SEM(buffer, SYNC_RECIPIENT_FE,
 432                                         SYNC_RECIPIENT_PE);
 433                                 CMD_STALL(buffer, SYNC_RECIPIENT_FE,
 434                                         SYNC_RECIPIENT_PE);
 435                         }
 436
 437                         gpu->flush_seq = new_flush_seq;
 438                 }
 439
 440                 if (switch_context) {
 441                         etnaviv_cmd_select_pipe(gpu, buffer, exec_state);
 442                         gpu->exec_state = exec_state;
 443                 }
 444
 445                 /* And the link to the submitted buffer */
 446                 link_target = etnaviv_cmdbuf_get_va(cmdbuf,
 447                                         &gpu->mmu_context->cmdbuf_mapping);
 448                 CMD_LINK(buffer, link_dwords, link_target);
 449
 450                 /* Update the link target to point to above instructions */
 451                 link_target = target;
 452                 link_dwords = extra_dwords;
 453         }
 454
 455         /*
 456          * Append a LINK to the submitted command buffer to return to
 457          * the ring buffer.  return_target is the ring target address.
 458          * We need at most 7 dwords in the return target: 2 cache flush +
 459          * 2 semaphore stall + 1 event + 1 wait + 1 link.
 460          */
 461         return_dwords = 7;
 462
 463         /*
 464          * When the BLT engine is present we need 6 more dwords in the return
 465          * target: 3 enable/flush/disable + 4 enable/semaphore stall/disable,
 466          * but we don't need the normal TS flush state.
 467          */
 468         if (has_blt)
 469                 return_dwords += 6;
 470
 471         return_target = etnaviv_buffer_reserve(gpu, buffer, return_dwords);
 472         CMD_LINK(cmdbuf, return_dwords, return_target);
 473
 474         /*
 475          * Append a cache flush, stall, event, wait and link pointing back to
 476          * the wait command to the ring buffer.
 477          */
 478         if (gpu->exec_state == ETNA_PIPE_2D) {
 479                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE,
 480                                        VIVS_GL_FLUSH_CACHE_PE2D);
 481         } else {
 482                 CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_CACHE,
 483                                        VIVS_GL_FLUSH_CACHE_DEPTH |
 484                                        VIVS_GL_FLUSH_CACHE_COLOR);
 485                 if (has_blt) {
 486                         CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x1);
 487                         CMD_LOAD_STATE(buffer, VIVS_BLT_SET_COMMAND, 0x1);
 488                         CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x0);
 489                 } else {
 490                         CMD_LOAD_STATE(buffer, VIVS_TS_FLUSH_CACHE,
 491                                                VIVS_TS_FLUSH_CACHE_FLUSH);
 492                 }
 493         }
 494         CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 495         CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_PE);
 496
 497         if (has_blt) {
 498                 CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x1);
 499                 CMD_SEM(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_BLT);
 500                 CMD_STALL(buffer, SYNC_RECIPIENT_FE, SYNC_RECIPIENT_BLT);
 501                 CMD_LOAD_STATE(buffer, VIVS_BLT_ENABLE, 0x0);
 502         }
 503
 504         CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
 505                        VIVS_GL_EVENT_FROM_PE);
 506         CMD_WAIT(buffer);
 507         CMD_LINK(buffer, 2,
 508                  etnaviv_cmdbuf_get_va(buffer, &gpu->mmu_context->cmdbuf_mapping)
 509                  + buffer->user_size - 4);
 510
 511         if (drm_debug_enabled(DRM_UT_DRIVER))
 512                 pr_info("stream link to 0x%08x @ 0x%08x %p\n",
 513                         return_target,
 514                         etnaviv_cmdbuf_get_va(cmdbuf, &gpu->mmu_context->cmdbuf_mapping),
 515                         cmdbuf->vaddr);
 516
 517         if (drm_debug_enabled(DRM_UT_DRIVER)) {
 518                 print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
 519                                cmdbuf->vaddr, cmdbuf->size, 0);
 520
 521                 pr_info("link op: %p\n", buffer->vaddr + waitlink_offset);
 522                 pr_info("addr: 0x%08x\n", link_target);
 523                 pr_info("back: 0x%08x\n", return_target);
 524                 pr_info("event: %d\n", event);
 525         }
 526
 527         /*
 528          * Kick off the submitted command by replacing the previous
 529          * WAIT with a link to the address in the ring buffer.
 530          */
 531         etnaviv_buffer_replace_wait(buffer, waitlink_offset,
 532                                     VIV_FE_LINK_HEADER_OP_LINK |
 533                                     VIV_FE_LINK_HEADER_PREFETCH(link_dwords),
 534                                     link_target);
 535
 536         if (drm_debug_enabled(DRM_UT_DRIVER))
 537                 etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
 538 }