drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c

   1 /*
   2  * Copyright (C) 2015 Etnaviv Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/dma-fence-array.h>
  18 #include <linux/reservation.h>
  19 #include <linux/sync_file.h>
  20 #include "etnaviv_cmdbuf.h"
  21 #include "etnaviv_drv.h"
  22 #include "etnaviv_gpu.h"
  23 #include "etnaviv_gem.h"
  24
  25 /*
  26  * Cmdstream submission:
  27  */
  28
  29 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
  30 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
  31 #define BO_LOCKED   0x4000
  32 #define BO_PINNED   0x2000
  33
  34 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
  35                 struct etnaviv_gpu *gpu, size_t nr)
  36 {
  37         struct etnaviv_gem_submit *submit;
  38         size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit));
  39
  40         submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  41         if (submit) {
  42                 submit->dev = dev;
  43                 submit->gpu = gpu;
  44
  45                 /* initially, until copy_from_user() and bo lookup succeeds: */
  46                 submit->nr_bos = 0;
  47                 submit->fence = NULL;
  48
  49                 ww_acquire_init(&submit->ticket, &reservation_ww_class);
  50         }
  51
  52         return submit;
  53 }
  54
  55 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
  56         struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
  57         unsigned nr_bos)
  58 {
  59         struct drm_etnaviv_gem_submit_bo *bo;
  60         unsigned i;
  61         int ret = 0;
  62
  63         spin_lock(&file->table_lock);
  64
  65         for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
  66                 struct drm_gem_object *obj;
  67
  68                 if (bo->flags & BO_INVALID_FLAGS) {
  69                         DRM_ERROR("invalid flags: %x\n", bo->flags);
  70                         ret = -EINVAL;
  71                         goto out_unlock;
  72                 }
  73
  74                 submit->bos[i].flags = bo->flags;
  75
  76                 /* normally use drm_gem_object_lookup(), but for bulk lookup
  77                  * all under single table_lock just hit object_idr directly:
  78                  */
  79                 obj = idr_find(&file->object_idr, bo->handle);
  80                 if (!obj) {
  81                         DRM_ERROR("invalid handle %u at index %u\n",
  82                                   bo->handle, i);
  83                         ret = -EINVAL;
  84                         goto out_unlock;
  85                 }
  86
  87                 /*
  88                  * Take a refcount on the object. The file table lock
  89                  * prevents the object_idr's refcount on this being dropped.
  90                  */
  91                 drm_gem_object_reference(obj);
  92
  93                 submit->bos[i].obj = to_etnaviv_bo(obj);
  94         }
  95
  96 out_unlock:
  97         submit->nr_bos = i;
  98         spin_unlock(&file->table_lock);
  99
 100         return ret;
 101 }
 102
 103 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
 104 {
 105         if (submit->bos[i].flags & BO_LOCKED) {
 106                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 107
 108                 ww_mutex_unlock(&etnaviv_obj->resv->lock);
 109                 submit->bos[i].flags &= ~BO_LOCKED;
 110         }
 111 }
 112
 113 static int submit_lock_objects(struct etnaviv_gem_submit *submit)
 114 {
 115         int contended, slow_locked = -1, i, ret = 0;
 116
 117 retry:
 118         for (i = 0; i < submit->nr_bos; i++) {
 119                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 120
 121                 if (slow_locked == i)
 122                         slow_locked = -1;
 123
 124                 contended = i;
 125
 126                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 127                         ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
 128                                         &submit->ticket);
 129                         if (ret == -EALREADY)
 130                                 DRM_ERROR("BO at index %u already on submit list\n",
 131                                           i);
 132                         if (ret)
 133                                 goto fail;
 134                         submit->bos[i].flags |= BO_LOCKED;
 135                 }
 136         }
 137
 138         ww_acquire_done(&submit->ticket);
 139
 140         return 0;
 141
 142 fail:
 143         for (; i >= 0; i--)
 144                 submit_unlock_object(submit, i);
 145
 146         if (slow_locked > 0)
 147                 submit_unlock_object(submit, slow_locked);
 148
 149         if (ret == -EDEADLK) {
 150                 struct etnaviv_gem_object *etnaviv_obj;
 151
 152                 etnaviv_obj = submit->bos[contended].obj;
 153
 154                 /* we lost out in a seqno race, lock and retry.. */
 155                 ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
 156                                 &submit->ticket);
 157                 if (!ret) {
 158                         submit->bos[contended].flags |= BO_LOCKED;
 159                         slow_locked = contended;
 160                         goto retry;
 161                 }
 162         }
 163
 164         return ret;
 165 }
 166
 167 static int submit_fence_sync(const struct etnaviv_gem_submit *submit)
 168 {
 169         unsigned int context = submit->gpu->fence_context;
 170         int i, ret = 0;
 171
 172         for (i = 0; i < submit->nr_bos; i++) {
 173                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 174                 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
 175                 bool explicit = !!(submit->flags & ETNA_SUBMIT_NO_IMPLICIT);
 176
 177                 ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write,
 178                                                  explicit);
 179                 if (ret)
 180                         break;
 181         }
 182
 183         return ret;
 184 }
 185
 186 static void submit_unpin_objects(struct etnaviv_gem_submit *submit)
 187 {
 188         int i;
 189
 190         for (i = 0; i < submit->nr_bos; i++) {
 191                 if (submit->bos[i].flags & BO_PINNED)
 192                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 193
 194                 submit->bos[i].mapping = NULL;
 195                 submit->bos[i].flags &= ~BO_PINNED;
 196         }
 197 }
 198
 199 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 200 {
 201         int i, ret = 0;
 202
 203         for (i = 0; i < submit->nr_bos; i++) {
 204                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 205                 struct etnaviv_vram_mapping *mapping;
 206
 207                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 208                                                   submit->gpu);
 209                 if (IS_ERR(mapping)) {
 210                         ret = PTR_ERR(mapping);
 211                         break;
 212                 }
 213
 214                 submit->bos[i].flags |= BO_PINNED;
 215                 submit->bos[i].mapping = mapping;
 216         }
 217
 218         return ret;
 219 }
 220
 221 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 222         struct etnaviv_gem_submit_bo **bo)
 223 {
 224         if (idx >= submit->nr_bos) {
 225                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 226                                 idx, submit->nr_bos);
 227                 return -EINVAL;
 228         }
 229
 230         *bo = &submit->bos[idx];
 231
 232         return 0;
 233 }
 234
 235 /* process the reloc's and patch up the cmdstream as needed: */
 236 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 237                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 238                 u32 nr_relocs)
 239 {
 240         u32 i, last_offset = 0;
 241         u32 *ptr = stream;
 242         int ret;
 243
 244         for (i = 0; i < nr_relocs; i++) {
 245                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 246                 struct etnaviv_gem_submit_bo *bo;
 247                 u32 off;
 248
 249                 if (unlikely(r->flags)) {
 250                         DRM_ERROR("invalid reloc flags\n");
 251                         return -EINVAL;
 252                 }
 253
 254                 if (r->submit_offset % 4) {
 255                         DRM_ERROR("non-aligned reloc offset: %u\n",
 256                                   r->submit_offset);
 257                         return -EINVAL;
 258                 }
 259
 260                 /* offset in dwords: */
 261                 off = r->submit_offset / 4;
 262
 263                 if ((off >= size ) ||
 264                                 (off < last_offset)) {
 265                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 266                         return -EINVAL;
 267                 }
 268
 269                 ret = submit_bo(submit, r->reloc_idx, &bo);
 270                 if (ret)
 271                         return ret;
 272
 273                 if (r->reloc_offset > bo->obj->base.size - sizeof(*ptr)) {
 274                         DRM_ERROR("relocation %u outside object\n", i);
 275                         return -EINVAL;
 276                 }
 277
 278                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 279
 280                 last_offset = off;
 281         }
 282
 283         return 0;
 284 }
 285
 286 static void submit_cleanup(struct etnaviv_gem_submit *submit)
 287 {
 288         unsigned i;
 289
 290         for (i = 0; i < submit->nr_bos; i++) {
 291                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 292
 293                 submit_unlock_object(submit, i);
 294                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 295         }
 296
 297         ww_acquire_fini(&submit->ticket);
 298         if (submit->fence)
 299                 dma_fence_put(submit->fence);
 300         kfree(submit);
 301 }
 302
 303 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 304                 struct drm_file *file)
 305 {
 306         struct etnaviv_drm_private *priv = dev->dev_private;
 307         struct drm_etnaviv_gem_submit *args = data;
 308         struct drm_etnaviv_gem_submit_reloc *relocs;
 309         struct drm_etnaviv_gem_submit_bo *bos;
 310         struct etnaviv_gem_submit *submit;
 311         struct etnaviv_cmdbuf *cmdbuf;
 312         struct etnaviv_gpu *gpu;
 313         struct dma_fence *in_fence = NULL;
 314         struct sync_file *sync_file = NULL;
 315         int out_fence_fd = -1;
 316         void *stream;
 317         int ret;
 318
 319         if (args->pipe >= ETNA_MAX_PIPES)
 320                 return -EINVAL;
 321
 322         gpu = priv->gpu[args->pipe];
 323         if (!gpu)
 324                 return -ENXIO;
 325
 326         if (args->stream_size % 4) {
 327                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 328                           args->stream_size);
 329                 return -EINVAL;
 330         }
 331
 332         if (args->exec_state != ETNA_PIPE_3D &&
 333             args->exec_state != ETNA_PIPE_2D &&
 334             args->exec_state != ETNA_PIPE_VG) {
 335                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 336                 return -EINVAL;
 337         }
 338
 339         if (args->flags & ~ETNA_SUBMIT_FLAGS) {
 340                 DRM_ERROR("invalid flags: 0x%x\n", args->flags);
 341                 return -EINVAL;
 342         }
 343
 344         /*
 345          * Copy the command submission and bo array to kernel space in
 346          * one go, and do this outside of any locks.
 347          */
 348         bos = kvmalloc_array(args->nr_bos, sizeof(*bos), GFP_KERNEL);
 349         relocs = kvmalloc_array(args->nr_relocs, sizeof(*relocs), GFP_KERNEL);
 350         stream = kvmalloc_array(1, args->stream_size, GFP_KERNEL);
 351         cmdbuf = etnaviv_cmdbuf_new(gpu->cmdbuf_suballoc,
 352                                     ALIGN(args->stream_size, 8) + 8,
 353                                     args->nr_bos);
 354         if (!bos || !relocs || !stream || !cmdbuf) {
 355                 ret = -ENOMEM;
 356                 goto err_submit_cmds;
 357         }
 358
 359         cmdbuf->exec_state = args->exec_state;
 360         cmdbuf->ctx = file->driver_priv;
 361
 362         ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
 363                              args->nr_bos * sizeof(*bos));
 364         if (ret) {
 365                 ret = -EFAULT;
 366                 goto err_submit_cmds;
 367         }
 368
 369         ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
 370                              args->nr_relocs * sizeof(*relocs));
 371         if (ret) {
 372                 ret = -EFAULT;
 373                 goto err_submit_cmds;
 374         }
 375
 376         ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 377                              args->stream_size);
 378         if (ret) {
 379                 ret = -EFAULT;
 380                 goto err_submit_cmds;
 381         }
 382
 383         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 384                 out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 385                 if (out_fence_fd < 0) {
 386                         ret = out_fence_fd;
 387                         goto err_submit_cmds;
 388                 }
 389         }
 390
 391         submit = submit_create(dev, gpu, args->nr_bos);
 392         if (!submit) {
 393                 ret = -ENOMEM;
 394                 goto err_submit_cmds;
 395         }
 396
 397         submit->flags = args->flags;
 398
 399         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 400         if (ret)
 401                 goto err_submit_objects;
 402
 403         ret = submit_lock_objects(submit);
 404         if (ret)
 405                 goto err_submit_objects;
 406
 407         if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 408                                       relocs, args->nr_relocs)) {
 409                 ret = -EINVAL;
 410                 goto err_submit_objects;
 411         }
 412
 413         if (args->flags & ETNA_SUBMIT_FENCE_FD_IN) {
 414                 in_fence = sync_file_get_fence(args->fence_fd);
 415                 if (!in_fence) {
 416                         ret = -EINVAL;
 417                         goto err_submit_objects;
 418                 }
 419
 420                 /*
 421                  * Wait if the fence is from a foreign context, or if the fence
 422                  * array contains any fence from a foreign context.
 423                  */
 424                 if (!dma_fence_match_context(in_fence, gpu->fence_context)) {
 425                         ret = dma_fence_wait(in_fence, true);
 426                         if (ret)
 427                                 goto err_submit_objects;
 428                 }
 429         }
 430
 431         ret = submit_fence_sync(submit);
 432         if (ret)
 433                 goto err_submit_objects;
 434
 435         ret = submit_pin_objects(submit);
 436         if (ret)
 437                 goto out;
 438
 439         ret = submit_reloc(submit, stream, args->stream_size / 4,
 440                            relocs, args->nr_relocs);
 441         if (ret)
 442                 goto out;
 443
 444         memcpy(cmdbuf->vaddr, stream, args->stream_size);
 445         cmdbuf->user_size = ALIGN(args->stream_size, 8);
 446
 447         ret = etnaviv_gpu_submit(gpu, submit, cmdbuf);
 448         if (ret == 0)
 449                 cmdbuf = NULL;
 450
 451         if (args->flags & ETNA_SUBMIT_FENCE_FD_OUT) {
 452                 /*
 453                  * This can be improved: ideally we want to allocate the sync
 454                  * file before kicking off the GPU job and just attach the
 455                  * fence to the sync file here, eliminating the ENOMEM
 456                  * possibility at this stage.
 457                  */
 458                 sync_file = sync_file_create(submit->fence);
 459                 if (!sync_file) {
 460                         ret = -ENOMEM;
 461                         goto out;
 462                 }
 463                 fd_install(out_fence_fd, sync_file->file);
 464         }
 465
 466         args->fence_fd = out_fence_fd;
 467         args->fence = submit->fence->seqno;
 468
 469 out:
 470         submit_unpin_objects(submit);
 471
 472         /*
 473          * If we're returning -EAGAIN, it may be due to the userptr code
 474          * wanting to run its workqueue outside of any locks. Flush our
 475          * workqueue to ensure that it is run in a timely manner.
 476          */
 477         if (ret == -EAGAIN)
 478                 flush_workqueue(priv->wq);
 479
 480 err_submit_objects:
 481         if (in_fence)
 482                 dma_fence_put(in_fence);
 483         submit_cleanup(submit);
 484
 485 err_submit_cmds:
 486         if (ret && (out_fence_fd >= 0))
 487                 put_unused_fd(out_fence_fd);
 488         /* if we still own the cmdbuf */
 489         if (cmdbuf)
 490                 etnaviv_cmdbuf_free(cmdbuf);
 491         if (stream)
 492                 kvfree(stream);
 493         if (bos)
 494                 kvfree(bos);
 495         if (relocs)
 496                 kvfree(relocs);
 497
 498         return ret;
 499 }