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/reservation.h>
  18 #include "etnaviv_drv.h"
  19 #include "etnaviv_gpu.h"
  20 #include "etnaviv_gem.h"
  21
  22 /*
  23  * Cmdstream submission:
  24  */
  25
  26 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
  27 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
  28 #define BO_LOCKED   0x4000
  29 #define BO_PINNED   0x2000
  30
  31 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
  32                 struct etnaviv_gpu *gpu, size_t nr)
  33 {
  34         struct etnaviv_gem_submit *submit;
  35         size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit));
  36
  37         submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  38         if (submit) {
  39                 submit->dev = dev;
  40                 submit->gpu = gpu;
  41
  42                 /* initially, until copy_from_user() and bo lookup succeeds: */
  43                 submit->nr_bos = 0;
  44
  45                 ww_acquire_init(&submit->ticket, &reservation_ww_class);
  46         }
  47
  48         return submit;
  49 }
  50
  51 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
  52         struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
  53         unsigned nr_bos)
  54 {
  55         struct drm_etnaviv_gem_submit_bo *bo;
  56         unsigned i;
  57         int ret = 0;
  58
  59         spin_lock(&file->table_lock);
  60
  61         for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
  62                 struct drm_gem_object *obj;
  63
  64                 if (bo->flags & BO_INVALID_FLAGS) {
  65                         DRM_ERROR("invalid flags: %x\n", bo->flags);
  66                         ret = -EINVAL;
  67                         goto out_unlock;
  68                 }
  69
  70                 submit->bos[i].flags = bo->flags;
  71
  72                 /* normally use drm_gem_object_lookup(), but for bulk lookup
  73                  * all under single table_lock just hit object_idr directly:
  74                  */
  75                 obj = idr_find(&file->object_idr, bo->handle);
  76                 if (!obj) {
  77                         DRM_ERROR("invalid handle %u at index %u\n",
  78                                   bo->handle, i);
  79                         ret = -EINVAL;
  80                         goto out_unlock;
  81                 }
  82
  83                 /*
  84                  * Take a refcount on the object. The file table lock
  85                  * prevents the object_idr's refcount on this being dropped.
  86                  */
  87                 drm_gem_object_reference(obj);
  88
  89                 submit->bos[i].obj = to_etnaviv_bo(obj);
  90         }
  91
  92 out_unlock:
  93         submit->nr_bos = i;
  94         spin_unlock(&file->table_lock);
  95
  96         return ret;
  97 }
  98
  99 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
 100 {
 101         if (submit->bos[i].flags & BO_LOCKED) {
 102                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 103
 104                 ww_mutex_unlock(&etnaviv_obj->resv->lock);
 105                 submit->bos[i].flags &= ~BO_LOCKED;
 106         }
 107 }
 108
 109 static int submit_lock_objects(struct etnaviv_gem_submit *submit)
 110 {
 111         int contended, slow_locked = -1, i, ret = 0;
 112
 113 retry:
 114         for (i = 0; i < submit->nr_bos; i++) {
 115                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 116
 117                 if (slow_locked == i)
 118                         slow_locked = -1;
 119
 120                 contended = i;
 121
 122                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 123                         ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
 124                                         &submit->ticket);
 125                         if (ret == -EALREADY)
 126                                 DRM_ERROR("BO at index %u already on submit list\n",
 127                                           i);
 128                         if (ret)
 129                                 goto fail;
 130                         submit->bos[i].flags |= BO_LOCKED;
 131                 }
 132         }
 133
 134         ww_acquire_done(&submit->ticket);
 135
 136         return 0;
 137
 138 fail:
 139         for (; i >= 0; i--)
 140                 submit_unlock_object(submit, i);
 141
 142         if (slow_locked > 0)
 143                 submit_unlock_object(submit, slow_locked);
 144
 145         if (ret == -EDEADLK) {
 146                 struct etnaviv_gem_object *etnaviv_obj;
 147
 148                 etnaviv_obj = submit->bos[contended].obj;
 149
 150                 /* we lost out in a seqno race, lock and retry.. */
 151                 ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
 152                                 &submit->ticket);
 153                 if (!ret) {
 154                         submit->bos[contended].flags |= BO_LOCKED;
 155                         slow_locked = contended;
 156                         goto retry;
 157                 }
 158         }
 159
 160         return ret;
 161 }
 162
 163 static int submit_fence_sync(const struct etnaviv_gem_submit *submit)
 164 {
 165         unsigned int context = submit->gpu->fence_context;
 166         int i, ret = 0;
 167
 168         for (i = 0; i < submit->nr_bos; i++) {
 169                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 170                 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
 171
 172                 ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write);
 173                 if (ret)
 174                         break;
 175         }
 176
 177         return ret;
 178 }
 179
 180 static void submit_unpin_objects(struct etnaviv_gem_submit *submit)
 181 {
 182         int i;
 183
 184         for (i = 0; i < submit->nr_bos; i++) {
 185                 if (submit->bos[i].flags & BO_PINNED)
 186                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 187
 188                 submit->bos[i].mapping = NULL;
 189                 submit->bos[i].flags &= ~BO_PINNED;
 190         }
 191 }
 192
 193 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 194 {
 195         int i, ret = 0;
 196
 197         for (i = 0; i < submit->nr_bos; i++) {
 198                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 199                 struct etnaviv_vram_mapping *mapping;
 200
 201                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 202                                                   submit->gpu);
 203                 if (IS_ERR(mapping)) {
 204                         ret = PTR_ERR(mapping);
 205                         break;
 206                 }
 207
 208                 submit->bos[i].flags |= BO_PINNED;
 209                 submit->bos[i].mapping = mapping;
 210         }
 211
 212         return ret;
 213 }
 214
 215 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 216         struct etnaviv_gem_submit_bo **bo)
 217 {
 218         if (idx >= submit->nr_bos) {
 219                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 220                                 idx, submit->nr_bos);
 221                 return -EINVAL;
 222         }
 223
 224         *bo = &submit->bos[idx];
 225
 226         return 0;
 227 }
 228
 229 /* process the reloc's and patch up the cmdstream as needed: */
 230 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 231                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 232                 u32 nr_relocs)
 233 {
 234         u32 i, last_offset = 0;
 235         u32 *ptr = stream;
 236         int ret;
 237
 238         for (i = 0; i < nr_relocs; i++) {
 239                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 240                 struct etnaviv_gem_submit_bo *bo;
 241                 u32 off;
 242
 243                 if (unlikely(r->flags)) {
 244                         DRM_ERROR("invalid reloc flags\n");
 245                         return -EINVAL;
 246                 }
 247
 248                 if (r->submit_offset % 4) {
 249                         DRM_ERROR("non-aligned reloc offset: %u\n",
 250                                   r->submit_offset);
 251                         return -EINVAL;
 252                 }
 253
 254                 /* offset in dwords: */
 255                 off = r->submit_offset / 4;
 256
 257                 if ((off >= size ) ||
 258                                 (off < last_offset)) {
 259                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 260                         return -EINVAL;
 261                 }
 262
 263                 ret = submit_bo(submit, r->reloc_idx, &bo);
 264                 if (ret)
 265                         return ret;
 266
 267                 if (r->reloc_offset >= bo->obj->base.size - sizeof(*ptr)) {
 268                         DRM_ERROR("relocation %u outside object", i);
 269                         return -EINVAL;
 270                 }
 271
 272                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 273
 274                 last_offset = off;
 275         }
 276
 277         return 0;
 278 }
 279
 280 static void submit_cleanup(struct etnaviv_gem_submit *submit)
 281 {
 282         unsigned i;
 283
 284         for (i = 0; i < submit->nr_bos; i++) {
 285                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 286
 287                 submit_unlock_object(submit, i);
 288                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 289         }
 290
 291         ww_acquire_fini(&submit->ticket);
 292         kfree(submit);
 293 }
 294
 295 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 296                 struct drm_file *file)
 297 {
 298         struct etnaviv_drm_private *priv = dev->dev_private;
 299         struct drm_etnaviv_gem_submit *args = data;
 300         struct drm_etnaviv_gem_submit_reloc *relocs;
 301         struct drm_etnaviv_gem_submit_bo *bos;
 302         struct etnaviv_gem_submit *submit;
 303         struct etnaviv_cmdbuf *cmdbuf;
 304         struct etnaviv_gpu *gpu;
 305         void *stream;
 306         int ret;
 307
 308         if (args->pipe >= ETNA_MAX_PIPES)
 309                 return -EINVAL;
 310
 311         gpu = priv->gpu[args->pipe];
 312         if (!gpu)
 313                 return -ENXIO;
 314
 315         if (args->stream_size % 4) {
 316                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 317                           args->stream_size);
 318                 return -EINVAL;
 319         }
 320
 321         if (args->exec_state != ETNA_PIPE_3D &&
 322             args->exec_state != ETNA_PIPE_2D &&
 323             args->exec_state != ETNA_PIPE_VG) {
 324                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 325                 return -EINVAL;
 326         }
 327
 328         /*
 329          * Copy the command submission and bo array to kernel space in
 330          * one go, and do this outside of any locks.
 331          */
 332         bos = drm_malloc_ab(args->nr_bos, sizeof(*bos));
 333         relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs));
 334         stream = drm_malloc_ab(1, args->stream_size);
 335         cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8,
 336                                         args->nr_bos);
 337         if (!bos || !relocs || !stream || !cmdbuf) {
 338                 ret = -ENOMEM;
 339                 goto err_submit_cmds;
 340         }
 341
 342         cmdbuf->exec_state = args->exec_state;
 343         cmdbuf->ctx = file->driver_priv;
 344
 345         ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
 346                              args->nr_bos * sizeof(*bos));
 347         if (ret) {
 348                 ret = -EFAULT;
 349                 goto err_submit_cmds;
 350         }
 351
 352         ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
 353                              args->nr_relocs * sizeof(*relocs));
 354         if (ret) {
 355                 ret = -EFAULT;
 356                 goto err_submit_cmds;
 357         }
 358
 359         ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 360                              args->stream_size);
 361         if (ret) {
 362                 ret = -EFAULT;
 363                 goto err_submit_cmds;
 364         }
 365
 366         submit = submit_create(dev, gpu, args->nr_bos);
 367         if (!submit) {
 368                 ret = -ENOMEM;
 369                 goto err_submit_cmds;
 370         }
 371
 372         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 373         if (ret)
 374                 goto err_submit_objects;
 375
 376         ret = submit_lock_objects(submit);
 377         if (ret)
 378                 goto err_submit_objects;
 379
 380         if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 381                                       relocs, args->nr_relocs)) {
 382                 ret = -EINVAL;
 383                 goto err_submit_objects;
 384         }
 385
 386         ret = submit_fence_sync(submit);
 387         if (ret)
 388                 goto err_submit_objects;
 389
 390         ret = submit_pin_objects(submit);
 391         if (ret)
 392                 goto out;
 393
 394         ret = submit_reloc(submit, stream, args->stream_size / 4,
 395                            relocs, args->nr_relocs);
 396         if (ret)
 397                 goto out;
 398
 399         memcpy(cmdbuf->vaddr, stream, args->stream_size);
 400         cmdbuf->user_size = ALIGN(args->stream_size, 8);
 401
 402         ret = etnaviv_gpu_submit(gpu, submit, cmdbuf);
 403         if (ret == 0)
 404                 cmdbuf = NULL;
 405
 406         args->fence = submit->fence;
 407
 408 out:
 409         submit_unpin_objects(submit);
 410
 411         /*
 412          * If we're returning -EAGAIN, it may be due to the userptr code
 413          * wanting to run its workqueue outside of any locks. Flush our
 414          * workqueue to ensure that it is run in a timely manner.
 415          */
 416         if (ret == -EAGAIN)
 417                 flush_workqueue(priv->wq);
 418
 419 err_submit_objects:
 420         submit_cleanup(submit);
 421
 422 err_submit_cmds:
 423         /* if we still own the cmdbuf */
 424         if (cmdbuf)
 425                 etnaviv_gpu_cmdbuf_free(cmdbuf);
 426         if (stream)
 427                 drm_free_large(stream);
 428         if (bos)
 429                 drm_free_large(bos);
 430         if (relocs)
 431                 drm_free_large(relocs);
 432
 433         return ret;
 434 }