freedreno/msm/msm_ringbuffer.c

   1 /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
   2
   3 /*
   4  * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
   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 (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rob Clark <robclark@freedesktop.org>
  27  */
  28
  29 #include <assert.h>
  30 #include <inttypes.h>
  31
  32 #include "freedreno_ringbuffer.h"
  33 #include "msm_priv.h"
  34
  35 /* represents a single cmd buffer in the submit ioctl.  Each cmd buffer has
  36  * a backing bo, and a reloc table.
  37  */
  38 struct msm_cmd {
  39         struct list_head list;
  40
  41         struct fd_ringbuffer *ring;
  42         struct fd_bo *ring_bo;
  43
  44         /* reloc's table: */
  45         struct drm_msm_gem_submit_reloc *relocs;
  46         uint32_t nr_relocs, max_relocs;
  47
  48         uint32_t size;
  49 };
  50
  51 struct msm_ringbuffer {
  52         struct fd_ringbuffer base;
  53
  54         /* submit ioctl related tables:
  55          * Note that bos and cmds are tracked by the parent ringbuffer, since
  56          * that is global to the submit ioctl call.  The reloc's table is tracked
  57          * per cmd-buffer.
  58          */
  59         struct {
  60                 /* bo's table: */
  61                 struct drm_msm_gem_submit_bo *bos;
  62                 uint32_t nr_bos, max_bos;
  63
  64                 /* cmd's table: */
  65                 struct drm_msm_gem_submit_cmd *cmds;
  66                 uint32_t nr_cmds, max_cmds;
  67         } submit;
  68
  69         /* should have matching entries in submit.bos: */
  70         /* Note, only in parent ringbuffer */
  71         struct fd_bo **bos;
  72         uint32_t nr_bos, max_bos;
  73
  74         /* should have matching entries in submit.cmds: */
  75         struct msm_cmd **cmds;
  76         uint32_t nr_cmds, max_cmds;
  77
  78         /* List of physical cmdstream buffers (msm_cmd) assocated with this
  79          * logical fd_ringbuffer.
  80          *
  81          * Note that this is different from msm_ringbuffer::cmds (which
  82          * shadows msm_ringbuffer::submit::cmds for tracking submit ioctl
  83          * related stuff, and *only* is tracked in the parent ringbuffer.
  84          * And only has "completed" cmd buffers (ie. we already know the
  85          * size) added via get_cmd().
  86          */
  87         struct list_head cmd_list;
  88
  89         int is_growable;
  90         unsigned cmd_count;
  91
  92         unsigned seqno;
  93
  94         /* maps fd_bo to idx: */
  95         void *bo_table;
  96 };
  97
  98 static inline struct msm_ringbuffer * to_msm_ringbuffer(struct fd_ringbuffer *x)
  99 {
 100         return (struct msm_ringbuffer *)x;
 101 }
 102
 103 #define INIT_SIZE 0x1000
 104
 105 static pthread_mutex_t idx_lock = PTHREAD_MUTEX_INITIALIZER;
 106 drm_private extern pthread_mutex_t table_lock;
 107
 108 static void ring_bo_del(struct fd_device *dev, struct fd_bo *bo)
 109 {
 110         int ret;
 111
 112         pthread_mutex_lock(&table_lock);
 113         ret = fd_bo_cache_free(&to_msm_device(dev)->ring_cache, bo);
 114         pthread_mutex_unlock(&table_lock);
 115
 116         if (ret == 0)
 117                 return;
 118
 119         fd_bo_del(bo);
 120 }
 121
 122 static struct fd_bo * ring_bo_new(struct fd_device *dev, uint32_t size)
 123 {
 124         struct fd_bo *bo;
 125
 126         bo = fd_bo_cache_alloc(&to_msm_device(dev)->ring_cache, &size, 0);
 127         if (bo)
 128                 return bo;
 129
 130         bo = fd_bo_new(dev, size, 0);
 131         if (!bo)
 132                 return NULL;
 133
 134         /* keep ringbuffer bo's out of the normal bo cache: */
 135         bo->bo_reuse = FALSE;
 136
 137         return bo;
 138 }
 139
 140 static void ring_cmd_del(struct msm_cmd *cmd)
 141 {
 142         if (cmd->ring_bo)
 143                 ring_bo_del(cmd->ring->pipe->dev, cmd->ring_bo);
 144         list_del(&cmd->list);
 145         to_msm_ringbuffer(cmd->ring)->cmd_count--;
 146         free(cmd->relocs);
 147         free(cmd);
 148 }
 149
 150 static struct msm_cmd * ring_cmd_new(struct fd_ringbuffer *ring, uint32_t size)
 151 {
 152         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 153         struct msm_cmd *cmd = calloc(1, sizeof(*cmd));
 154
 155         if (!cmd)
 156                 return NULL;
 157
 158         cmd->ring = ring;
 159         cmd->ring_bo = ring_bo_new(ring->pipe->dev, size);
 160         if (!cmd->ring_bo)
 161                 goto fail;
 162
 163         list_addtail(&cmd->list, &msm_ring->cmd_list);
 164         msm_ring->cmd_count++;
 165
 166         return cmd;
 167
 168 fail:
 169         ring_cmd_del(cmd);
 170         return NULL;
 171 }
 172
 173 static void *grow(void *ptr, uint32_t nr, uint32_t *max, uint32_t sz)
 174 {
 175         if ((nr + 1) > *max) {
 176                 if ((*max * 2) < (nr + 1))
 177                         *max = nr + 5;
 178                 else
 179                         *max = *max * 2;
 180                 ptr = realloc(ptr, *max * sz);
 181         }
 182         return ptr;
 183 }
 184
 185 #define APPEND(x, name) ({ \
 186         (x)->name = grow((x)->name, (x)->nr_ ## name, &(x)->max_ ## name, sizeof((x)->name[0])); \
 187         (x)->nr_ ## name ++; \
 188 })
 189
 190 static struct msm_cmd *current_cmd(struct fd_ringbuffer *ring)
 191 {
 192         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 193         assert(!LIST_IS_EMPTY(&msm_ring->cmd_list));
 194         return LIST_LAST_ENTRY(&msm_ring->cmd_list, struct msm_cmd, list);
 195 }
 196
 197 static uint32_t append_bo(struct fd_ringbuffer *ring, struct fd_bo *bo)
 198 {
 199         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 200         uint32_t idx;
 201
 202         idx = APPEND(&msm_ring->submit, bos);
 203         idx = APPEND(msm_ring, bos);
 204
 205         msm_ring->submit.bos[idx].flags = 0;
 206         msm_ring->submit.bos[idx].handle = bo->handle;
 207         msm_ring->submit.bos[idx].presumed = to_msm_bo(bo)->presumed;
 208
 209         msm_ring->bos[idx] = fd_bo_ref(bo);
 210
 211         return idx;
 212 }
 213
 214 /* add (if needed) bo, return idx: */
 215 static uint32_t bo2idx(struct fd_ringbuffer *ring, struct fd_bo *bo, uint32_t flags)
 216 {
 217         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 218         struct msm_bo *msm_bo = to_msm_bo(bo);
 219         uint32_t idx;
 220         pthread_mutex_lock(&idx_lock);
 221         if (msm_bo->current_ring_seqno == msm_ring->seqno) {
 222                 idx = msm_bo->idx;
 223         } else {
 224                 void *val;
 225
 226                 if (!msm_ring->bo_table)
 227                         msm_ring->bo_table = drmHashCreate();
 228
 229                 if (!drmHashLookup(msm_ring->bo_table, bo->handle, &val)) {
 230                         /* found */
 231                         idx = (uint32_t)(uintptr_t)val;
 232                 } else {
 233                         idx = append_bo(ring, bo);
 234                         val = (void *)(uintptr_t)idx;
 235                         drmHashInsert(msm_ring->bo_table, bo->handle, val);
 236                 }
 237                 msm_bo->current_ring_seqno = msm_ring->seqno;
 238                 msm_bo->idx = idx;
 239         }
 240         pthread_mutex_unlock(&idx_lock);
 241         if (flags & FD_RELOC_READ)
 242                 msm_ring->submit.bos[idx].flags |= MSM_SUBMIT_BO_READ;
 243         if (flags & FD_RELOC_WRITE)
 244                 msm_ring->submit.bos[idx].flags |= MSM_SUBMIT_BO_WRITE;
 245         return idx;
 246 }
 247
 248 static int check_cmd_bo(struct fd_ringbuffer *ring,
 249                 struct drm_msm_gem_submit_cmd *cmd, struct fd_bo *bo)
 250 {
 251         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 252         return msm_ring->submit.bos[cmd->submit_idx].handle == bo->handle;
 253 }
 254
 255 /* Ensure that submit has corresponding entry in cmds table for the
 256  * target cmdstream buffer:
 257  */
 258 static void get_cmd(struct fd_ringbuffer *ring, struct msm_cmd *target_cmd,
 259                 uint32_t submit_offset, uint32_t size, uint32_t type)
 260 {
 261         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 262         struct drm_msm_gem_submit_cmd *cmd;
 263         uint32_t i;
 264
 265         /* figure out if we already have a cmd buf: */
 266         for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
 267                 cmd = &msm_ring->submit.cmds[i];
 268                 if ((cmd->submit_offset == submit_offset) &&
 269                                 (cmd->size == size) &&
 270                                 (cmd->type == type) &&
 271                                 check_cmd_bo(ring, cmd, target_cmd->ring_bo))
 272                         return;
 273         }
 274
 275         /* create cmd buf if not: */
 276         i = APPEND(&msm_ring->submit, cmds);
 277         APPEND(msm_ring, cmds);
 278         msm_ring->cmds[i] = target_cmd;
 279         cmd = &msm_ring->submit.cmds[i];
 280         cmd->type = type;
 281         cmd->submit_idx = bo2idx(ring, target_cmd->ring_bo, FD_RELOC_READ);
 282         cmd->submit_offset = submit_offset;
 283         cmd->size = size;
 284         cmd->pad = 0;
 285
 286         target_cmd->size = size;
 287 }
 288
 289 static void * msm_ringbuffer_hostptr(struct fd_ringbuffer *ring)
 290 {
 291         return fd_bo_map(current_cmd(ring)->ring_bo);
 292 }
 293
 294 static uint32_t find_next_reloc_idx(struct msm_cmd *msm_cmd,
 295                 uint32_t start, uint32_t offset)
 296 {
 297         uint32_t i;
 298
 299         /* a binary search would be more clever.. */
 300         for (i = start; i < msm_cmd->nr_relocs; i++) {
 301                 struct drm_msm_gem_submit_reloc *reloc = &msm_cmd->relocs[i];
 302                 if (reloc->submit_offset >= offset)
 303                         return i;
 304         }
 305
 306         return i;
 307 }
 308
 309 static void delete_cmds(struct msm_ringbuffer *msm_ring)
 310 {
 311         struct msm_cmd *cmd, *tmp;
 312
 313         LIST_FOR_EACH_ENTRY_SAFE(cmd, tmp, &msm_ring->cmd_list, list) {
 314                 ring_cmd_del(cmd);
 315         }
 316 }
 317
 318 static void flush_reset(struct fd_ringbuffer *ring)
 319 {
 320         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 321         unsigned i;
 322
 323         for (i = 0; i < msm_ring->nr_bos; i++) {
 324                 struct msm_bo *msm_bo = to_msm_bo(msm_ring->bos[i]);
 325                 msm_bo->current_ring_seqno = 0;
 326                 fd_bo_del(&msm_bo->base);
 327         }
 328
 329         /* for each of the cmd buffers, clear their reloc's: */
 330         for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
 331                 struct msm_cmd *target_cmd = msm_ring->cmds[i];
 332                 target_cmd->nr_relocs = 0;
 333         }
 334
 335         msm_ring->submit.nr_cmds = 0;
 336         msm_ring->submit.nr_bos = 0;
 337         msm_ring->nr_cmds = 0;
 338         msm_ring->nr_bos = 0;
 339
 340         if (msm_ring->bo_table) {
 341                 drmHashDestroy(msm_ring->bo_table);
 342                 msm_ring->bo_table = NULL;
 343         }
 344
 345         if (msm_ring->is_growable) {
 346                 delete_cmds(msm_ring);
 347         } else {
 348                 /* in old mode, just reset the # of relocs: */
 349                 current_cmd(ring)->nr_relocs = 0;
 350         }
 351 }
 352
 353 static void finalize_current_cmd(struct fd_ringbuffer *ring, uint32_t *last_start)
 354 {
 355         uint32_t submit_offset, size, type;
 356         struct fd_ringbuffer *parent;
 357
 358         if (ring->parent) {
 359                 parent = ring->parent;
 360                 type = MSM_SUBMIT_CMD_IB_TARGET_BUF;
 361         } else {
 362                 parent = ring;
 363                 type = MSM_SUBMIT_CMD_BUF;
 364         }
 365
 366         submit_offset = offset_bytes(last_start, ring->start);
 367         size = offset_bytes(ring->cur, last_start);
 368
 369         get_cmd(parent, current_cmd(ring), submit_offset, size, type);
 370 }
 371
 372 static void dump_submit(struct msm_ringbuffer *msm_ring)
 373 {
 374         uint32_t i, j;
 375
 376         for (i = 0; i < msm_ring->submit.nr_bos; i++) {
 377                 struct drm_msm_gem_submit_bo *bo = &msm_ring->submit.bos[i];
 378                 ERROR_MSG("  bos[%d]: handle=%u, flags=%x", i, bo->handle, bo->flags);
 379         }
 380         for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
 381                 struct drm_msm_gem_submit_cmd *cmd = &msm_ring->submit.cmds[i];
 382                 struct drm_msm_gem_submit_reloc *relocs = U642VOID(cmd->relocs);
 383                 ERROR_MSG("  cmd[%d]: type=%u, submit_idx=%u, submit_offset=%u, size=%u",
 384                                 i, cmd->type, cmd->submit_idx, cmd->submit_offset, cmd->size);
 385                 for (j = 0; j < cmd->nr_relocs; j++) {
 386                         struct drm_msm_gem_submit_reloc *r = &relocs[j];
 387                         ERROR_MSG("    reloc[%d]: submit_offset=%u, or=%08x, shift=%d, reloc_idx=%u"
 388                                         ", reloc_offset=%"PRIu64, j, r->submit_offset, r->or, r->shift,
 389                                         r->reloc_idx, r->reloc_offset);
 390                 }
 391         }
 392 }
 393
 394 static int msm_ringbuffer_flush(struct fd_ringbuffer *ring, uint32_t *last_start,
 395                 int in_fence_fd, int *out_fence_fd)
 396 {
 397         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 398         struct drm_msm_gem_submit req = {
 399                         .flags = to_msm_pipe(ring->pipe)->pipe,
 400                         .queueid = to_msm_pipe(ring->pipe)->queue_id,
 401         };
 402         uint32_t i;
 403         int ret;
 404
 405         if (in_fence_fd != -1) {
 406                 req.flags |= MSM_SUBMIT_FENCE_FD_IN | MSM_SUBMIT_NO_IMPLICIT;
 407                 req.fence_fd = in_fence_fd;
 408         }
 409
 410         if (out_fence_fd) {
 411                 req.flags |= MSM_SUBMIT_FENCE_FD_OUT;
 412         }
 413
 414         finalize_current_cmd(ring, last_start);
 415
 416         /* needs to be after get_cmd() as that could create bos/cmds table: */
 417         req.bos = VOID2U64(msm_ring->submit.bos),
 418         req.nr_bos = msm_ring->submit.nr_bos;
 419         req.cmds = VOID2U64(msm_ring->submit.cmds),
 420         req.nr_cmds = msm_ring->submit.nr_cmds;
 421
 422         /* for each of the cmd's fix up their reloc's: */
 423         for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
 424                 struct drm_msm_gem_submit_cmd *cmd = &msm_ring->submit.cmds[i];
 425                 struct msm_cmd *msm_cmd = msm_ring->cmds[i];
 426                 uint32_t a = find_next_reloc_idx(msm_cmd, 0, cmd->submit_offset);
 427                 uint32_t b = find_next_reloc_idx(msm_cmd, a, cmd->submit_offset + cmd->size);
 428                 cmd->relocs = VOID2U64(&msm_cmd->relocs[a]);
 429                 cmd->nr_relocs = (b > a) ? b - a : 0;
 430         }
 431
 432         DEBUG_MSG("nr_cmds=%u, nr_bos=%u", req.nr_cmds, req.nr_bos);
 433
 434         ret = drmCommandWriteRead(ring->pipe->dev->fd, DRM_MSM_GEM_SUBMIT,
 435                         &req, sizeof(req));
 436         if (ret) {
 437                 ERROR_MSG("submit failed: %d (%s)", ret, strerror(errno));
 438                 dump_submit(msm_ring);
 439         } else if (!ret) {
 440                 /* update timestamp on all rings associated with submit: */
 441                 for (i = 0; i < msm_ring->submit.nr_cmds; i++) {
 442                         struct msm_cmd *msm_cmd = msm_ring->cmds[i];
 443                         msm_cmd->ring->last_timestamp = req.fence;
 444                 }
 445
 446                 if (out_fence_fd) {
 447                         *out_fence_fd = req.fence_fd;
 448                 }
 449         }
 450
 451         flush_reset(ring);
 452
 453         return ret;
 454 }
 455
 456 static void msm_ringbuffer_grow(struct fd_ringbuffer *ring, uint32_t size)
 457 {
 458         assert(to_msm_ringbuffer(ring)->is_growable);
 459         finalize_current_cmd(ring, ring->last_start);
 460         ring_cmd_new(ring, size);
 461 }
 462
 463 static void msm_ringbuffer_reset(struct fd_ringbuffer *ring)
 464 {
 465         flush_reset(ring);
 466 }
 467
 468 static void msm_ringbuffer_emit_reloc(struct fd_ringbuffer *ring,
 469                 const struct fd_reloc *r)
 470 {
 471         struct fd_ringbuffer *parent = ring->parent ? ring->parent : ring;
 472         struct msm_bo *msm_bo = to_msm_bo(r->bo);
 473         struct drm_msm_gem_submit_reloc *reloc;
 474         struct msm_cmd *cmd = current_cmd(ring);
 475         uint32_t idx = APPEND(cmd, relocs);
 476         uint32_t addr;
 477
 478         reloc = &cmd->relocs[idx];
 479
 480         reloc->reloc_idx = bo2idx(parent, r->bo, r->flags);
 481         reloc->reloc_offset = r->offset;
 482         reloc->or = r->or;
 483         reloc->shift = r->shift;
 484         reloc->submit_offset = offset_bytes(ring->cur, ring->start);
 485
 486         addr = msm_bo->presumed;
 487         if (reloc->shift < 0)
 488                 addr >>= -reloc->shift;
 489         else
 490                 addr <<= reloc->shift;
 491         (*ring->cur++) = addr | r->or;
 492
 493         if (ring->pipe->gpu_id >= 500) {
 494                 struct drm_msm_gem_submit_reloc *reloc_hi;
 495
 496                 /* NOTE: grab reloc_idx *before* APPEND() since that could
 497                  * realloc() meaning that 'reloc' ptr is no longer valid:
 498                  */
 499                 uint32_t reloc_idx = reloc->reloc_idx;
 500
 501                 idx = APPEND(cmd, relocs);
 502
 503                 reloc_hi = &cmd->relocs[idx];
 504
 505                 reloc_hi->reloc_idx = reloc_idx;
 506                 reloc_hi->reloc_offset = r->offset;
 507                 reloc_hi->or = r->orhi;
 508                 reloc_hi->shift = r->shift - 32;
 509                 reloc_hi->submit_offset = offset_bytes(ring->cur, ring->start);
 510
 511                 addr = msm_bo->presumed >> 32;
 512                 if (reloc_hi->shift < 0)
 513                         addr >>= -reloc_hi->shift;
 514                 else
 515                         addr <<= reloc_hi->shift;
 516                 (*ring->cur++) = addr | r->orhi;
 517         }
 518 }
 519
 520 static uint32_t msm_ringbuffer_emit_reloc_ring(struct fd_ringbuffer *ring,
 521                 struct fd_ringbuffer *target, uint32_t cmd_idx,
 522                 uint32_t submit_offset, uint32_t size)
 523 {
 524         struct msm_cmd *cmd = NULL;
 525         uint32_t idx = 0;
 526
 527         LIST_FOR_EACH_ENTRY(cmd, &to_msm_ringbuffer(target)->cmd_list, list) {
 528                 if (idx == cmd_idx)
 529                         break;
 530                 idx++;
 531         }
 532
 533         assert(cmd && (idx == cmd_idx));
 534
 535         if (idx < (to_msm_ringbuffer(target)->cmd_count - 1)) {
 536                 /* All but the last cmd buffer is fully "baked" (ie. already has
 537                  * done get_cmd() to add it to the cmds table).  But in this case,
 538                  * the size we get is invalid (since it is calculated from the
 539                  * last cmd buffer):
 540                  */
 541                 size = cmd->size;
 542         } else {
 543                 get_cmd(ring, cmd, submit_offset, size, MSM_SUBMIT_CMD_IB_TARGET_BUF);
 544         }
 545
 546         msm_ringbuffer_emit_reloc(ring, &(struct fd_reloc){
 547                 .bo = cmd->ring_bo,
 548                 .flags = FD_RELOC_READ,
 549                 .offset = submit_offset,
 550         });
 551
 552         return size;
 553 }
 554
 555 static uint32_t msm_ringbuffer_cmd_count(struct fd_ringbuffer *ring)
 556 {
 557         return to_msm_ringbuffer(ring)->cmd_count;
 558 }
 559
 560 static void msm_ringbuffer_destroy(struct fd_ringbuffer *ring)
 561 {
 562         struct msm_ringbuffer *msm_ring = to_msm_ringbuffer(ring);
 563
 564         flush_reset(ring);
 565         delete_cmds(msm_ring);
 566
 567         free(msm_ring->submit.cmds);
 568         free(msm_ring->submit.bos);
 569         free(msm_ring->bos);
 570         free(msm_ring->cmds);
 571         free(msm_ring);
 572 }
 573
 574 static const struct fd_ringbuffer_funcs funcs = {
 575                 .hostptr = msm_ringbuffer_hostptr,
 576                 .flush = msm_ringbuffer_flush,
 577                 .grow = msm_ringbuffer_grow,
 578                 .reset = msm_ringbuffer_reset,
 579                 .emit_reloc = msm_ringbuffer_emit_reloc,
 580                 .emit_reloc_ring = msm_ringbuffer_emit_reloc_ring,
 581                 .cmd_count = msm_ringbuffer_cmd_count,
 582                 .destroy = msm_ringbuffer_destroy,
 583 };
 584
 585 drm_private struct fd_ringbuffer * msm_ringbuffer_new(struct fd_pipe *pipe,
 586                 uint32_t size, enum fd_ringbuffer_flags flags)
 587 {
 588         struct msm_ringbuffer *msm_ring;
 589         struct fd_ringbuffer *ring;
 590
 591         assert(!flags);
 592
 593         msm_ring = calloc(1, sizeof(*msm_ring));
 594         if (!msm_ring) {
 595                 ERROR_MSG("allocation failed");
 596                 return NULL;
 597         }
 598
 599         if (size == 0) {
 600                 assert(pipe->dev->version >= FD_VERSION_UNLIMITED_CMDS);
 601                 size = INIT_SIZE;
 602                 msm_ring->is_growable = TRUE;
 603         }
 604
 605         list_inithead(&msm_ring->cmd_list);
 606         msm_ring->seqno = ++to_msm_device(pipe->dev)->ring_cnt;
 607
 608         ring = &msm_ring->base;
 609         ring->funcs = &funcs;
 610         ring->size = size;
 611         ring->pipe = pipe;   /* needed in ring_cmd_new() */
 612
 613         ring_cmd_new(ring, size);
 614
 615         return ring;
 616 }