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 inline void __user *to_user_ptr(u64 address)
  32 {
  33         return (void __user *)(uintptr_t)address;
  34 }
  35
  36 static struct etnaviv_gem_submit *submit_create(struct drm_device *dev,
  37                 struct etnaviv_gpu *gpu, size_t nr)
  38 {
  39         struct etnaviv_gem_submit *submit;
  40         size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit));
  41
  42         submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  43         if (submit) {
  44                 submit->dev = dev;
  45                 submit->gpu = gpu;
  46
  47                 /* initially, until copy_from_user() and bo lookup succeeds: */
  48                 submit->nr_bos = 0;
  49
  50                 ww_acquire_init(&submit->ticket, &reservation_ww_class);
  51         }
  52
  53         return submit;
  54 }
  55
  56 static int submit_lookup_objects(struct etnaviv_gem_submit *submit,
  57         struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos,
  58         unsigned nr_bos)
  59 {
  60         struct drm_etnaviv_gem_submit_bo *bo;
  61         unsigned i;
  62         int ret = 0;
  63
  64         spin_lock(&file->table_lock);
  65
  66         for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) {
  67                 struct drm_gem_object *obj;
  68
  69                 if (bo->flags & BO_INVALID_FLAGS) {
  70                         DRM_ERROR("invalid flags: %x\n", bo->flags);
  71                         ret = -EINVAL;
  72                         goto out_unlock;
  73                 }
  74
  75                 submit->bos[i].flags = bo->flags;
  76
  77                 /* normally use drm_gem_object_lookup(), but for bulk lookup
  78                  * all under single table_lock just hit object_idr directly:
  79                  */
  80                 obj = idr_find(&file->object_idr, bo->handle);
  81                 if (!obj) {
  82                         DRM_ERROR("invalid handle %u at index %u\n",
  83                                   bo->handle, i);
  84                         ret = -EINVAL;
  85                         goto out_unlock;
  86                 }
  87
  88                 /*
  89                  * Take a refcount on the object. The file table lock
  90                  * prevents the object_idr's refcount on this being dropped.
  91                  */
  92                 drm_gem_object_reference(obj);
  93
  94                 submit->bos[i].obj = to_etnaviv_bo(obj);
  95         }
  96
  97 out_unlock:
  98         submit->nr_bos = i;
  99         spin_unlock(&file->table_lock);
 100
 101         return ret;
 102 }
 103
 104 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i)
 105 {
 106         if (submit->bos[i].flags & BO_LOCKED) {
 107                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 108
 109                 ww_mutex_unlock(&etnaviv_obj->resv->lock);
 110                 submit->bos[i].flags &= ~BO_LOCKED;
 111         }
 112 }
 113
 114 static int submit_lock_objects(struct etnaviv_gem_submit *submit)
 115 {
 116         int contended, slow_locked = -1, i, ret = 0;
 117
 118 retry:
 119         for (i = 0; i < submit->nr_bos; i++) {
 120                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 121
 122                 if (slow_locked == i)
 123                         slow_locked = -1;
 124
 125                 contended = i;
 126
 127                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 128                         ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock,
 129                                         &submit->ticket);
 130                         if (ret == -EALREADY)
 131                                 DRM_ERROR("BO at index %u already on submit list\n",
 132                                           i);
 133                         if (ret)
 134                                 goto fail;
 135                         submit->bos[i].flags |= BO_LOCKED;
 136                 }
 137         }
 138
 139         ww_acquire_done(&submit->ticket);
 140
 141         return 0;
 142
 143 fail:
 144         for (; i >= 0; i--)
 145                 submit_unlock_object(submit, i);
 146
 147         if (slow_locked > 0)
 148                 submit_unlock_object(submit, slow_locked);
 149
 150         if (ret == -EDEADLK) {
 151                 struct etnaviv_gem_object *etnaviv_obj;
 152
 153                 etnaviv_obj = submit->bos[contended].obj;
 154
 155                 /* we lost out in a seqno race, lock and retry.. */
 156                 ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock,
 157                                 &submit->ticket);
 158                 if (!ret) {
 159                         submit->bos[contended].flags |= BO_LOCKED;
 160                         slow_locked = contended;
 161                         goto retry;
 162                 }
 163         }
 164
 165         return ret;
 166 }
 167
 168 static int submit_fence_sync(const struct etnaviv_gem_submit *submit)
 169 {
 170         unsigned int context = submit->gpu->fence_context;
 171         int i, ret = 0;
 172
 173         for (i = 0; i < submit->nr_bos; i++) {
 174                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 175                 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;
 176
 177                 ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write);
 178                 if (ret)
 179                         break;
 180         }
 181
 182         return ret;
 183 }
 184
 185 static void submit_unpin_objects(struct etnaviv_gem_submit *submit)
 186 {
 187         int i;
 188
 189         for (i = 0; i < submit->nr_bos; i++) {
 190                 if (submit->bos[i].flags & BO_PINNED)
 191                         etnaviv_gem_mapping_unreference(submit->bos[i].mapping);
 192
 193                 submit->bos[i].mapping = NULL;
 194                 submit->bos[i].flags &= ~BO_PINNED;
 195         }
 196 }
 197
 198 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 199 {
 200         int i, ret = 0;
 201
 202         for (i = 0; i < submit->nr_bos; i++) {
 203                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 204                 struct etnaviv_vram_mapping *mapping;
 205
 206                 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base,
 207                                                   submit->gpu);
 208                 if (IS_ERR(mapping)) {
 209                         ret = PTR_ERR(mapping);
 210                         break;
 211                 }
 212
 213                 submit->bos[i].flags |= BO_PINNED;
 214                 submit->bos[i].mapping = mapping;
 215         }
 216
 217         return ret;
 218 }
 219
 220 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 221         struct etnaviv_gem_submit_bo **bo)
 222 {
 223         if (idx >= submit->nr_bos) {
 224                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 225                                 idx, submit->nr_bos);
 226                 return -EINVAL;
 227         }
 228
 229         *bo = &submit->bos[idx];
 230
 231         return 0;
 232 }
 233
 234 /* process the reloc's and patch up the cmdstream as needed: */
 235 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 236                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 237                 u32 nr_relocs)
 238 {
 239         u32 i, last_offset = 0;
 240         u32 *ptr = stream;
 241         int ret;
 242
 243         for (i = 0; i < nr_relocs; i++) {
 244                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 245                 struct etnaviv_gem_submit_bo *bo;
 246                 u32 off;
 247
 248                 if (unlikely(r->flags)) {
 249                         DRM_ERROR("invalid reloc flags\n");
 250                         return -EINVAL;
 251                 }
 252
 253                 if (r->submit_offset % 4) {
 254                         DRM_ERROR("non-aligned reloc offset: %u\n",
 255                                   r->submit_offset);
 256                         return -EINVAL;
 257                 }
 258
 259                 /* offset in dwords: */
 260                 off = r->submit_offset / 4;
 261
 262                 if ((off >= size ) ||
 263                                 (off < last_offset)) {
 264                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 265                         return -EINVAL;
 266                 }
 267
 268                 ret = submit_bo(submit, r->reloc_idx, &bo);
 269                 if (ret)
 270                         return ret;
 271
 272                 if (r->reloc_offset >= bo->obj->base.size - sizeof(*ptr)) {
 273                         DRM_ERROR("relocation %u outside object", i);
 274                         return -EINVAL;
 275                 }
 276
 277                 ptr[off] = bo->mapping->iova + r->reloc_offset;
 278
 279                 last_offset = off;
 280         }
 281
 282         return 0;
 283 }
 284
 285 static void submit_cleanup(struct etnaviv_gem_submit *submit)
 286 {
 287         unsigned i;
 288
 289         for (i = 0; i < submit->nr_bos; i++) {
 290                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 291
 292                 submit_unlock_object(submit, i);
 293                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 294         }
 295
 296         ww_acquire_fini(&submit->ticket);
 297         kfree(submit);
 298 }
 299
 300 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 301                 struct drm_file *file)
 302 {
 303         struct etnaviv_drm_private *priv = dev->dev_private;
 304         struct drm_etnaviv_gem_submit *args = data;
 305         struct drm_etnaviv_gem_submit_reloc *relocs;
 306         struct drm_etnaviv_gem_submit_bo *bos;
 307         struct etnaviv_gem_submit *submit;
 308         struct etnaviv_cmdbuf *cmdbuf;
 309         struct etnaviv_gpu *gpu;
 310         void *stream;
 311         int ret;
 312
 313         if (args->pipe >= ETNA_MAX_PIPES)
 314                 return -EINVAL;
 315
 316         gpu = priv->gpu[args->pipe];
 317         if (!gpu)
 318                 return -ENXIO;
 319
 320         if (args->stream_size % 4) {
 321                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 322                           args->stream_size);
 323                 return -EINVAL;
 324         }
 325
 326         if (args->exec_state != ETNA_PIPE_3D &&
 327             args->exec_state != ETNA_PIPE_2D &&
 328             args->exec_state != ETNA_PIPE_VG) {
 329                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 330                 return -EINVAL;
 331         }
 332
 333         /*
 334          * Copy the command submission and bo array to kernel space in
 335          * one go, and do this outside of any locks.
 336          */
 337         bos = drm_malloc_ab(args->nr_bos, sizeof(*bos));
 338         relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs));
 339         stream = drm_malloc_ab(1, args->stream_size);
 340         cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8,
 341                                         args->nr_bos);
 342         if (!bos || !relocs || !stream || !cmdbuf) {
 343                 ret = -ENOMEM;
 344                 goto err_submit_cmds;
 345         }
 346
 347         cmdbuf->exec_state = args->exec_state;
 348         cmdbuf->ctx = file->driver_priv;
 349
 350         ret = copy_from_user(bos, to_user_ptr(args->bos),
 351                              args->nr_bos * sizeof(*bos));
 352         if (ret) {
 353                 ret = -EFAULT;
 354                 goto err_submit_cmds;
 355         }
 356
 357         ret = copy_from_user(relocs, to_user_ptr(args->relocs),
 358                              args->nr_relocs * sizeof(*relocs));
 359         if (ret) {
 360                 ret = -EFAULT;
 361                 goto err_submit_cmds;
 362         }
 363
 364         ret = copy_from_user(stream, to_user_ptr(args->stream),
 365                              args->stream_size);
 366         if (ret) {
 367                 ret = -EFAULT;
 368                 goto err_submit_cmds;
 369         }
 370
 371         submit = submit_create(dev, gpu, args->nr_bos);
 372         if (!submit) {
 373                 ret = -ENOMEM;
 374                 goto err_submit_cmds;
 375         }
 376
 377         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 378         if (ret)
 379                 goto err_submit_objects;
 380
 381         ret = submit_lock_objects(submit);
 382         if (ret)
 383                 goto err_submit_objects;
 384
 385         if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 386                                       relocs, args->nr_relocs)) {
 387                 ret = -EINVAL;
 388                 goto err_submit_objects;
 389         }
 390
 391         ret = submit_fence_sync(submit);
 392         if (ret)
 393                 goto err_submit_objects;
 394
 395         ret = submit_pin_objects(submit);
 396         if (ret)
 397                 goto out;
 398
 399         ret = submit_reloc(submit, stream, args->stream_size / 4,
 400                            relocs, args->nr_relocs);
 401         if (ret)
 402                 goto out;
 403
 404         memcpy(cmdbuf->vaddr, stream, args->stream_size);
 405         cmdbuf->user_size = ALIGN(args->stream_size, 8);
 406
 407         ret = etnaviv_gpu_submit(gpu, submit, cmdbuf);
 408         if (ret == 0)
 409                 cmdbuf = NULL;
 410
 411         args->fence = submit->fence;
 412
 413 out:
 414         submit_unpin_objects(submit);
 415
 416         /*
 417          * If we're returning -EAGAIN, it may be due to the userptr code
 418          * wanting to run its workqueue outside of any locks. Flush our
 419          * workqueue to ensure that it is run in a timely manner.
 420          */
 421         if (ret == -EAGAIN)
 422                 flush_workqueue(priv->wq);
 423
 424 err_submit_objects:
 425         submit_cleanup(submit);
 426
 427 err_submit_cmds:
 428         /* if we still own the cmdbuf */
 429         if (cmdbuf)
 430                 etnaviv_gpu_cmdbuf_free(cmdbuf);
 431         if (stream)
 432                 drm_free_large(stream);
 433         if (bos)
 434                 drm_free_large(bos);
 435         if (relocs)
 436                 drm_free_large(relocs);
 437
 438         return ret;
 439 }