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                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 191
 192                 if (submit->bos[i].flags & BO_PINNED)
 193                         etnaviv_gem_put_iova(submit->gpu, &etnaviv_obj->base);
 194
 195                 submit->bos[i].iova = 0;
 196                 submit->bos[i].flags &= ~BO_PINNED;
 197         }
 198 }
 199
 200 static int submit_pin_objects(struct etnaviv_gem_submit *submit)
 201 {
 202         int i, ret = 0;
 203
 204         for (i = 0; i < submit->nr_bos; i++) {
 205                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 206                 u32 iova;
 207
 208                 ret = etnaviv_gem_get_iova(submit->gpu, &etnaviv_obj->base,
 209                                            &iova);
 210                 if (ret)
 211                         break;
 212
 213                 submit->bos[i].flags |= BO_PINNED;
 214                 submit->bos[i].iova = iova;
 215         }
 216
 217         return ret;
 218 }
 219
 220 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx,
 221                 struct etnaviv_gem_object **obj, u32 *iova)
 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         if (obj)
 230                 *obj = submit->bos[idx].obj;
 231         if (iova)
 232                 *iova = submit->bos[idx].iova;
 233
 234         return 0;
 235 }
 236
 237 /* process the reloc's and patch up the cmdstream as needed: */
 238 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream,
 239                 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs,
 240                 u32 nr_relocs)
 241 {
 242         u32 i, last_offset = 0;
 243         u32 *ptr = stream;
 244         int ret;
 245
 246         for (i = 0; i < nr_relocs; i++) {
 247                 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i;
 248                 struct etnaviv_gem_object *bobj;
 249                 u32 iova, off;
 250
 251                 if (unlikely(r->flags)) {
 252                         DRM_ERROR("invalid reloc flags\n");
 253                         return -EINVAL;
 254                 }
 255
 256                 if (r->submit_offset % 4) {
 257                         DRM_ERROR("non-aligned reloc offset: %u\n",
 258                                   r->submit_offset);
 259                         return -EINVAL;
 260                 }
 261
 262                 /* offset in dwords: */
 263                 off = r->submit_offset / 4;
 264
 265                 if ((off >= size ) ||
 266                                 (off < last_offset)) {
 267                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 268                         return -EINVAL;
 269                 }
 270
 271                 ret = submit_bo(submit, r->reloc_idx, &bobj, &iova);
 272                 if (ret)
 273                         return ret;
 274
 275                 if (r->reloc_offset >=
 276                     bobj->base.size - sizeof(*ptr)) {
 277                         DRM_ERROR("relocation %u outside object", i);
 278                         return -EINVAL;
 279                 }
 280
 281                 ptr[off] = iova + r->reloc_offset;
 282
 283                 last_offset = off;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static void submit_cleanup(struct etnaviv_gem_submit *submit)
 290 {
 291         unsigned i;
 292
 293         for (i = 0; i < submit->nr_bos; i++) {
 294                 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
 295
 296                 submit_unlock_object(submit, i);
 297                 drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 298         }
 299
 300         ww_acquire_fini(&submit->ticket);
 301         kfree(submit);
 302 }
 303
 304 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 305                 struct drm_file *file)
 306 {
 307         struct etnaviv_drm_private *priv = dev->dev_private;
 308         struct drm_etnaviv_gem_submit *args = data;
 309         struct drm_etnaviv_gem_submit_reloc *relocs;
 310         struct drm_etnaviv_gem_submit_bo *bos;
 311         struct etnaviv_gem_submit *submit;
 312         struct etnaviv_cmdbuf *cmdbuf;
 313         struct etnaviv_gpu *gpu;
 314         void *stream;
 315         int ret;
 316
 317         if (args->pipe >= ETNA_MAX_PIPES)
 318                 return -EINVAL;
 319
 320         gpu = priv->gpu[args->pipe];
 321         if (!gpu)
 322                 return -ENXIO;
 323
 324         if (args->stream_size % 4) {
 325                 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 326                           args->stream_size);
 327                 return -EINVAL;
 328         }
 329
 330         if (args->exec_state != ETNA_PIPE_3D &&
 331             args->exec_state != ETNA_PIPE_2D &&
 332             args->exec_state != ETNA_PIPE_VG) {
 333                 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state);
 334                 return -EINVAL;
 335         }
 336
 337         /*
 338          * Copy the command submission and bo array to kernel space in
 339          * one go, and do this outside of any locks.
 340          */
 341         bos = drm_malloc_ab(args->nr_bos, sizeof(*bos));
 342         relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs));
 343         stream = drm_malloc_ab(1, args->stream_size);
 344         cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8,
 345                                         args->nr_bos);
 346         if (!bos || !relocs || !stream || !cmdbuf) {
 347                 ret = -ENOMEM;
 348                 goto err_submit_cmds;
 349         }
 350
 351         cmdbuf->exec_state = args->exec_state;
 352         cmdbuf->ctx = file->driver_priv;
 353
 354         ret = copy_from_user(bos, to_user_ptr(args->bos),
 355                              args->nr_bos * sizeof(*bos));
 356         if (ret) {
 357                 ret = -EFAULT;
 358                 goto err_submit_cmds;
 359         }
 360
 361         ret = copy_from_user(relocs, to_user_ptr(args->relocs),
 362                              args->nr_relocs * sizeof(*relocs));
 363         if (ret) {
 364                 ret = -EFAULT;
 365                 goto err_submit_cmds;
 366         }
 367
 368         ret = copy_from_user(stream, to_user_ptr(args->stream),
 369                              args->stream_size);
 370         if (ret) {
 371                 ret = -EFAULT;
 372                 goto err_submit_cmds;
 373         }
 374
 375         submit = submit_create(dev, gpu, args->nr_bos);
 376         if (!submit) {
 377                 ret = -ENOMEM;
 378                 goto err_submit_cmds;
 379         }
 380
 381         ret = submit_lookup_objects(submit, file, bos, args->nr_bos);
 382         if (ret)
 383                 goto err_submit_objects;
 384
 385         ret = submit_lock_objects(submit);
 386         if (ret)
 387                 goto err_submit_objects;
 388
 389         if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4,
 390                                       relocs, args->nr_relocs)) {
 391                 ret = -EINVAL;
 392                 goto err_submit_objects;
 393         }
 394
 395         ret = submit_fence_sync(submit);
 396         if (ret)
 397                 goto err_submit_objects;
 398
 399         ret = submit_pin_objects(submit);
 400         if (ret)
 401                 goto out;
 402
 403         ret = submit_reloc(submit, stream, args->stream_size / 4,
 404                            relocs, args->nr_relocs);
 405         if (ret)
 406                 goto out;
 407
 408         memcpy(cmdbuf->vaddr, stream, args->stream_size);
 409         cmdbuf->user_size = ALIGN(args->stream_size, 8);
 410
 411         ret = etnaviv_gpu_submit(gpu, submit, cmdbuf);
 412         if (ret == 0)
 413                 cmdbuf = NULL;
 414
 415         args->fence = submit->fence;
 416
 417 out:
 418         submit_unpin_objects(submit);
 419
 420         /*
 421          * If we're returning -EAGAIN, it may be due to the userptr code
 422          * wanting to run its workqueue outside of any locks. Flush our
 423          * workqueue to ensure that it is run in a timely manner.
 424          */
 425         if (ret == -EAGAIN)
 426                 flush_workqueue(priv->wq);
 427
 428 err_submit_objects:
 429         submit_cleanup(submit);
 430
 431 err_submit_cmds:
 432         /* if we still own the cmdbuf */
 433         if (cmdbuf)
 434                 etnaviv_gpu_cmdbuf_free(cmdbuf);
 435         if (stream)
 436                 drm_free_large(stream);
 437         if (bos)
 438                 drm_free_large(bos);
 439         if (relocs)
 440                 drm_free_large(relocs);
 441
 442         return ret;
 443 }