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_cmdbuf.h"
  19 #include "etnaviv_drv.h"
  20 #include "etnaviv_gpu.h"
  21 #include "etnaviv_gem.h"
  22
  23 /*
  24  * Cmdstream submission:
  25  */
  26
  27 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE)
  28 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */
  29 #define BO_LOCKED   0x4000
  30 #define BO_PINNED   0x2000
  31
  32 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
  33                 struct etnaviv_gpu *gpu, size_t nr)
  34 {
  35         struct etnaviv_gem_submit *submit;
  36         size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit));
  37
  38         submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  39         if (submit) {
  40                 submit->dev = dev;
  41                 submit->gpu = gpu;
  42
  43                 /* initially, until copy_from_user() and bo lookup succeeds: */
  44                 submit->nr_bos = 0;
  45
  46                 ww_acquire_init(&submit->ticket, &reservation_ww_class);
  47         }
  48
  49         return submit;
  50 }
  51
  52 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
  53         struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
  54         unsigned nr_bos)
  55 {
  56         struct drm_etnaviv_gem_submit_bo *bo;
  57         unsigned i;
  58         int ret = 0;
  59
  60         spin_lock(&file->table_lock);
  61
  62         for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
  63                 struct drm_gem_object *obj;
  64
  65                 if (bo->flags & BO_INVALID_FLAGS) {
  66                         DRM_ERROR("invalid flags: %x\n", bo->flags);
  67                         ret = -EINVAL;
  68                         goto out_unlock;
  69                 }
  70
  71                 submit->bos[i].flags = bo->flags;
  72
  73                 /* normally use drm_gem_object_lookup(), but for bulk lookup
  74                  * all under single table_lock just hit object_idr directly:
  75                  */
  76                 obj = idr_find(&file->object_idr, bo->handle);
  77                 if (!obj) {
  78                         DRM_ERROR("invalid handle %u at index %u\n",
  79                                   bo->handle, i);
  80                         ret = -EINVAL;
  81                         goto out_unlock;
  82                 }
  83
  84                 /*
  85                  * Take a refcount on the object. The file table lock
  86                  * prevents the object_idr's refcount on this being dropped.
  87                  */
  88                 drm_gem_object_reference(obj);
  89
  90                 submit->bos[i].obj = to_etnaviv_bo(obj);
  91         }
  92
  93 out_unlock:
  94         submit->nr_bos = i;
  95         spin_unlock(&file->table_lock);
  96
  97         return ret;
  98 }
  99
 100 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
 101 {
 102         if (submit->bos[i].flags & BO_LOCKED) {
 103                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 104
 105                 ww_mutex_unlock(&etnaviv_obj->resv->lock);
 106                 submit->bos[i].flags &= ~BO_LOCKED;
 107         }
 108 }
 109
 110 static int submit_lock_objects(struct etnaviv_gem_submit *submit)
 111 {
 112         int contended, slow_locked = -1, i, ret = 0;
 113
 114 retry:
 115         for (i = 0; i < submit->nr_bos; i++) {
 116                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 117
 118                 if (slow_locked == i)
 119                         slow_locked = -1;
 120
 121                 contended = i;
 122
 123                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 124                         ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
 125                                         &submit->ticket);
 126                         if (ret == -EALREADY)
 127                                 DRM_ERROR("BO at index %u already on submit list\n",
 128                                           i);
 129                         if (ret)
 130                                 goto fail;
 131                         submit->bos[i].flags |= BO_LOCKED;
 132                 }
 133         }
 134
 135         ww_acquire_done(&submit->ticket);
 136
 137         return 0;
 138
 139 fail:
 140         for (; i >= 0; i--)
 141                 submit_unlock_object(submit, i);
 142
 143         if (slow_locked > 0)
 144                 submit_unlock_object(submit, slow_locked);
 145
 146         if (ret == -EDEADLK) {
 147                 struct etnaviv_gem_object *etnaviv_obj;
 148
 149                 etnaviv_obj = submit->bos[contended].obj;
 150
 151                 /* we lost out in a seqno race, lock and retry.. */
 152                 ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
 153                                 &submit->ticket);
 154                 if (!ret) {
 155                         submit->bos[contended].flags |= BO_LOCKED;
 156                         slow_locked = contended;
 157                         goto retry;
 158                 }
 159         }
 160
 161         return ret;
 162 }
 163
 164 static int submit_fence_sync(const struct etnaviv_gem_submit *submit)
 165 {
 166         unsigned int context = submit->gpu->fence_context;
 167         int i, ret = 0;
 168
 169         for (i = 0; i < submit->nr_bos; i++) {
 170                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 171                 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
 172
 173                 ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write);
 174                 if (ret)
 175                         break;
 176         }
 177
 178         return ret;
 179 }
 180
 181 static void submit_unpin_objects(struct etnaviv_gem_submit *submit)
 182 {
 183         int i;
 184
 185         for (i = 0; i < submit->nr_bos; i++) {
 186                 if (submit->bos[i].flags & BO_PINNED)
 187                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 188
 189                 submit->bos[i].mapping = NULL;
 190                 submit->bos[i].flags &= ~BO_PINNED;
 191         }
 192 }
 193
 194 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 195 {
 196         int i, ret = 0;
 197
 198         for (i = 0; i < submit->nr_bos; i++) {
 199                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 200                 struct etnaviv_vram_mapping *mapping;
 201
 202                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 203                                                   submit->gpu);
 204                 if (IS_ERR(mapping)) {
 205                         ret = PTR_ERR(mapping);
 206                         break;
 207                 }
 208
 209                 submit->bos[i].flags |= BO_PINNED;
 210                 submit->bos[i].mapping = mapping;
 211         }
 212
 213         return ret;
 214 }
 215
 216 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 217         struct etnaviv_gem_submit_bo **bo)
 218 {
 219         if (idx >= submit->nr_bos) {
 220                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 221                                 idx, submit->nr_bos);
 222                 return -EINVAL;
 223         }
 224
 225         *bo = &submit->bos[idx];
 226
 227         return 0;
 228 }
 229
 230 /* process the reloc's and patch up the cmdstream as needed: */
 231 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 232                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 233                 u32 nr_relocs)
 234 {
 235         u32 i, last_offset = 0;
 236         u32 *ptr = stream;
 237         int ret;
 238
 239         for (i = 0; i < nr_relocs; i++) {
 240                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 241                 struct etnaviv_gem_submit_bo *bo;
 242                 u32 off;
 243
 244                 if (unlikely(r->flags)) {
 245                         DRM_ERROR("invalid reloc flags\n");
 246                         return -EINVAL;
 247                 }
 248
 249                 if (r->submit_offset % 4) {
 250                         DRM_ERROR("non-aligned reloc offset: %u\n",
 251                                   r->submit_offset);
 252                         return -EINVAL;
 253                 }
 254
 255                 /* offset in dwords: */
 256                 off = r->submit_offset / 4;
 257
 258                 if ((off >= size ) ||
 259                                 (off < last_offset)) {
 260                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 261                         return -EINVAL;
 262                 }
 263
 264                 ret = submit_bo(submit, r->reloc_idx, &bo);
 265                 if (ret)
 266                         return ret;
 267
 268                 if (r->reloc_offset >= bo->obj->base.size - sizeof(*ptr)) {
 269                         DRM_ERROR("relocation %u outside object", i);
 270                         return -EINVAL;
 271                 }
 272
 273                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 274
 275                 last_offset = off;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void submit_cleanup(struct etnaviv_gem_submit *submit)
 282 {
 283         unsigned i;
 284
 285         for (i = 0; i < submit->nr_bos; i++) {
 286                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 287
 288                 submit_unlock_object(submit, i);
 289                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 290         }
 291
 292         ww_acquire_fini(&submit->ticket);
 293         kfree(submit);
 294 }
 295
 296 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 297                 struct drm_file *file)
 298 {
 299         struct etnaviv_drm_private *priv = dev->dev_private;
 300         struct drm_etnaviv_gem_submit *args = data;
 301         struct drm_etnaviv_gem_submit_reloc *relocs;
 302         struct drm_etnaviv_gem_submit_bo *bos;
 303         struct etnaviv_gem_submit *submit;
 304         struct etnaviv_cmdbuf *cmdbuf;
 305         struct etnaviv_gpu *gpu;
 306         void *stream;
 307         int ret;
 308
 309         if (args->pipe >= ETNA_MAX_PIPES)
 310                 return -EINVAL;
 311
 312         gpu = priv->gpu[args->pipe];
 313         if (!gpu)
 314                 return -ENXIO;
 315
 316         if (args->stream_size % 4) {
 317                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 318                           args->stream_size);
 319                 return -EINVAL;
 320         }
 321
 322         if (args->exec_state != ETNA_PIPE_3D &&
 323             args->exec_state != ETNA_PIPE_2D &&
 324             args->exec_state != ETNA_PIPE_VG) {
 325                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 326                 return -EINVAL;
 327         }
 328
 329         /*
 330          * Copy the command submission and bo array to kernel space in
 331          * one go, and do this outside of any locks.
 332          */
 333         bos = drm_malloc_ab(args->nr_bos, sizeof(*bos));
 334         relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs));
 335         stream = drm_malloc_ab(1, args->stream_size);
 336         cmdbuf = etnaviv_cmdbuf_new(gpu->cmdbuf_suballoc,
 337                                     ALIGN(args->stream_size, 8) + 8,
 338                                     args->nr_bos);
 339         if (!bos || !relocs || !stream || !cmdbuf) {
 340                 ret = -ENOMEM;
 341                 goto err_submit_cmds;
 342         }
 343
 344         cmdbuf->exec_state = args->exec_state;
 345         cmdbuf->ctx = file->driver_priv;
 346
 347         ret = copy_from_user(bos, u64_to_user_ptr(args->bos),
 348                              args->nr_bos * sizeof(*bos));
 349         if (ret) {
 350                 ret = -EFAULT;
 351                 goto err_submit_cmds;
 352         }
 353
 354         ret = copy_from_user(relocs, u64_to_user_ptr(args->relocs),
 355                              args->nr_relocs * sizeof(*relocs));
 356         if (ret) {
 357                 ret = -EFAULT;
 358                 goto err_submit_cmds;
 359         }
 360
 361         ret = copy_from_user(stream, u64_to_user_ptr(args->stream),
 362                              args->stream_size);
 363         if (ret) {
 364                 ret = -EFAULT;
 365                 goto err_submit_cmds;
 366         }
 367
 368         submit = submit_create(dev, gpu, args->nr_bos);
 369         if (!submit) {
 370                 ret = -ENOMEM;
 371                 goto err_submit_cmds;
 372         }
 373
 374         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 375         if (ret)
 376                 goto err_submit_objects;
 377
 378         ret = submit_lock_objects(submit);
 379         if (ret)
 380                 goto err_submit_objects;
 381
 382         if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 383                                       relocs, args->nr_relocs)) {
 384                 ret = -EINVAL;
 385                 goto err_submit_objects;
 386         }
 387
 388         ret = submit_fence_sync(submit);
 389         if (ret)
 390                 goto err_submit_objects;
 391
 392         ret = submit_pin_objects(submit);
 393         if (ret)
 394                 goto out;
 395
 396         ret = submit_reloc(submit, stream, args->stream_size / 4,
 397                            relocs, args->nr_relocs);
 398         if (ret)
 399                 goto out;
 400
 401         memcpy(cmdbuf->vaddr, stream, args->stream_size);
 402         cmdbuf->user_size = ALIGN(args->stream_size, 8);
 403
 404         ret = etnaviv_gpu_submit(gpu, submit, cmdbuf);
 405         if (ret == 0)
 406                 cmdbuf = NULL;
 407
 408         args->fence = submit->fence;
 409
 410 out:
 411         submit_unpin_objects(submit);
 412
 413         /*
 414          * If we're returning -EAGAIN, it may be due to the userptr code
 415          * wanting to run its workqueue outside of any locks. Flush our
 416          * workqueue to ensure that it is run in a timely manner.
 417          */
 418         if (ret == -EAGAIN)
 419                 flush_workqueue(priv->wq);
 420
 421 err_submit_objects:
 422         submit_cleanup(submit);
 423
 424 err_submit_cmds:
 425         /* if we still own the cmdbuf */
 426         if (cmdbuf)
 427                 etnaviv_cmdbuf_free(cmdbuf);
 428         if (stream)
 429                 drm_free_large(stream);
 430         if (bos)
 431                 drm_free_large(bos);
 432         if (relocs)
 433                 drm_free_large(relocs);
 434
 435         return ret;
 436 }