drivers/gpu/drm/msm/msm_gem_submit.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "msm_drv.h"
  19 #include "msm_gpu.h"
  20 #include "msm_gem.h"
  21
  22 /*
  23  * Cmdstream submission:
  24  */
  25
  26 /* make sure these don't conflict w/ MSM_SUBMIT_BO_x */
  27 #define BO_VALID    0x8000   /* is current addr in cmdstream correct/valid? */
  28 #define BO_LOCKED   0x4000
  29 #define BO_PINNED   0x2000
  30
  31 static struct msm_gem_submit *submit_create(struct drm_device *dev,
  32                 struct msm_gpu *gpu, int nr_bos, int nr_cmds)
  33 {
  34         struct msm_gem_submit *submit;
  35         int sz = sizeof(*submit) + (nr_bos * sizeof(submit->bos[0])) +
  36                         (nr_cmds * sizeof(*submit->cmd));
  37
  38         submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
  39         if (!submit)
  40                 return NULL;
  41
  42         submit->dev = dev;
  43         submit->gpu = gpu;
  44         submit->fence = NULL;
  45         submit->pid = get_pid(task_pid(current));
  46         submit->cmd = (void *)&submit->bos[nr_bos];
  47
  48         /* initially, until copy_from_user() and bo lookup succeeds: */
  49         submit->nr_bos = 0;
  50         submit->nr_cmds = 0;
  51
  52         INIT_LIST_HEAD(&submit->node);
  53         INIT_LIST_HEAD(&submit->bo_list);
  54         ww_acquire_init(&submit->ticket, &reservation_ww_class);
  55
  56         return submit;
  57 }
  58
  59 void msm_gem_submit_free(struct msm_gem_submit *submit)
  60 {
  61         fence_put(submit->fence);
  62         list_del(&submit->node);
  63         put_pid(submit->pid);
  64         kfree(submit);
  65 }
  66
  67 static inline unsigned long __must_check
  68 copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
  69 {
  70         if (access_ok(VERIFY_READ, from, n))
  71                 return __copy_from_user_inatomic(to, from, n);
  72         return -EFAULT;
  73 }
  74
  75 static int submit_lookup_objects(struct msm_gem_submit *submit,
  76                 struct drm_msm_gem_submit *args, struct drm_file *file)
  77 {
  78         unsigned i;
  79         int ret = 0;
  80
  81         spin_lock(&file->table_lock);
  82         pagefault_disable();
  83
  84         for (i = 0; i < args->nr_bos; i++) {
  85                 struct drm_msm_gem_submit_bo submit_bo;
  86                 struct drm_gem_object *obj;
  87                 struct msm_gem_object *msm_obj;
  88                 void __user *userptr =
  89                         u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));
  90
  91                 /* make sure we don't have garbage flags, in case we hit
  92                  * error path before flags is initialized:
  93                  */
  94                 submit->bos[i].flags = 0;
  95
  96                 ret = copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo));
  97                 if (unlikely(ret)) {
  98                         pagefault_enable();
  99                         spin_unlock(&file->table_lock);
 100                         ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo));
 101                         if (ret)
 102                                 goto out;
 103                         spin_lock(&file->table_lock);
 104                         pagefault_disable();
 105                 }
 106
 107                 if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) {
 108                         DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
 109                         ret = -EINVAL;
 110                         goto out_unlock;
 111                 }
 112
 113                 submit->bos[i].flags = submit_bo.flags;
 114                 /* in validate_objects() we figure out if this is true: */
 115                 submit->bos[i].iova  = submit_bo.presumed;
 116
 117                 /* normally use drm_gem_object_lookup(), but for bulk lookup
 118                  * all under single table_lock just hit object_idr directly:
 119                  */
 120                 obj = idr_find(&file->object_idr, submit_bo.handle);
 121                 if (!obj) {
 122                         DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i);
 123                         ret = -EINVAL;
 124                         goto out_unlock;
 125                 }
 126
 127                 msm_obj = to_msm_bo(obj);
 128
 129                 if (!list_empty(&msm_obj->submit_entry)) {
 130                         DRM_ERROR("handle %u at index %u already on submit list\n",
 131                                         submit_bo.handle, i);
 132                         ret = -EINVAL;
 133                         goto out_unlock;
 134                 }
 135
 136                 drm_gem_object_reference(obj);
 137
 138                 submit->bos[i].obj = msm_obj;
 139
 140                 list_add_tail(&msm_obj->submit_entry, &submit->bo_list);
 141         }
 142
 143 out_unlock:
 144         pagefault_enable();
 145         spin_unlock(&file->table_lock);
 146
 147 out:
 148         submit->nr_bos = i;
 149
 150         return ret;
 151 }
 152
 153 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
 154 {
 155         struct msm_gem_object *msm_obj = submit->bos[i].obj;
 156
 157         if (submit->bos[i].flags & BO_PINNED)
 158                 msm_gem_put_iova(&msm_obj->base, submit->gpu->id);
 159
 160         if (submit->bos[i].flags & BO_LOCKED)
 161                 ww_mutex_unlock(&msm_obj->resv->lock);
 162
 163         if (!(submit->bos[i].flags & BO_VALID))
 164                 submit->bos[i].iova = 0;
 165
 166         submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED);
 167 }
 168
 169 /* This is where we make sure all the bo's are reserved and pin'd: */
 170 static int submit_lock_objects(struct msm_gem_submit *submit)
 171 {
 172         int contended, slow_locked = -1, i, ret = 0;
 173
 174 retry:
 175         for (i = 0; i < submit->nr_bos; i++) {
 176                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 177
 178                 if (slow_locked == i)
 179                         slow_locked = -1;
 180
 181                 contended = i;
 182
 183                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 184                         ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock,
 185                                         &submit->ticket);
 186                         if (ret)
 187                                 goto fail;
 188                         submit->bos[i].flags |= BO_LOCKED;
 189                 }
 190         }
 191
 192         ww_acquire_done(&submit->ticket);
 193
 194         return 0;
 195
 196 fail:
 197         for (; i >= 0; i--)
 198                 submit_unlock_unpin_bo(submit, i);
 199
 200         if (slow_locked > 0)
 201                 submit_unlock_unpin_bo(submit, slow_locked);
 202
 203         if (ret == -EDEADLK) {
 204                 struct msm_gem_object *msm_obj = submit->bos[contended].obj;
 205                 /* we lost out in a seqno race, lock and retry.. */
 206                 ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock,
 207                                 &submit->ticket);
 208                 if (!ret) {
 209                         submit->bos[contended].flags |= BO_LOCKED;
 210                         slow_locked = contended;
 211                         goto retry;
 212                 }
 213         }
 214
 215         return ret;
 216 }
 217
 218 static int submit_fence_sync(struct msm_gem_submit *submit)
 219 {
 220         int i, ret = 0;
 221
 222         for (i = 0; i < submit->nr_bos; i++) {
 223                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 224                 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
 225
 226                 ret = msm_gem_sync_object(&msm_obj->base, submit->gpu->fctx, write);
 227                 if (ret)
 228                         break;
 229         }
 230
 231         return ret;
 232 }
 233
 234 static int submit_pin_objects(struct msm_gem_submit *submit)
 235 {
 236         int i, ret = 0;
 237
 238         submit->valid = true;
 239
 240         for (i = 0; i < submit->nr_bos; i++) {
 241                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 242                 uint32_t iova;
 243
 244                 /* if locking succeeded, pin bo: */
 245                 ret = msm_gem_get_iova_locked(&msm_obj->base,
 246                                 submit->gpu->id, &iova);
 247
 248                 if (ret)
 249                         break;
 250
 251                 submit->bos[i].flags |= BO_PINNED;
 252
 253                 if (iova == submit->bos[i].iova) {
 254                         submit->bos[i].flags |= BO_VALID;
 255                 } else {
 256                         submit->bos[i].iova = iova;
 257                         /* iova changed, so address in cmdstream is not valid: */
 258                         submit->bos[i].flags &= ~BO_VALID;
 259                         submit->valid = false;
 260                 }
 261         }
 262
 263         return ret;
 264 }
 265
 266 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 267                 struct msm_gem_object **obj, uint32_t *iova, bool *valid)
 268 {
 269         if (idx >= submit->nr_bos) {
 270                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 271                                 idx, submit->nr_bos);
 272                 return -EINVAL;
 273         }
 274
 275         if (obj)
 276                 *obj = submit->bos[idx].obj;
 277         if (iova)
 278                 *iova = submit->bos[idx].iova;
 279         if (valid)
 280                 *valid = !!(submit->bos[idx].flags & BO_VALID);
 281
 282         return 0;
 283 }
 284
 285 /* process the reloc's and patch up the cmdstream as needed: */
 286 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
 287                 uint32_t offset, uint32_t nr_relocs, uint64_t relocs)
 288 {
 289         uint32_t i, last_offset = 0;
 290         uint32_t *ptr;
 291         int ret;
 292
 293         if (offset % 4) {
 294                 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
 295                 return -EINVAL;
 296         }
 297
 298         /* For now, just map the entire thing.  Eventually we probably
 299          * to do it page-by-page, w/ kmap() if not vmap()d..
 300          */
 301         ptr = msm_gem_get_vaddr_locked(&obj->base);
 302
 303         if (IS_ERR(ptr)) {
 304                 ret = PTR_ERR(ptr);
 305                 DBG("failed to map: %d", ret);
 306                 return ret;
 307         }
 308
 309         for (i = 0; i < nr_relocs; i++) {
 310                 struct drm_msm_gem_submit_reloc submit_reloc;
 311                 void __user *userptr =
 312                         u64_to_user_ptr(relocs + (i * sizeof(submit_reloc)));
 313                 uint32_t iova, off;
 314                 bool valid;
 315
 316                 ret = copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc));
 317                 if (ret)
 318                         return -EFAULT;
 319
 320                 if (submit_reloc.submit_offset % 4) {
 321                         DRM_ERROR("non-aligned reloc offset: %u\n",
 322                                         submit_reloc.submit_offset);
 323                         return -EINVAL;
 324                 }
 325
 326                 /* offset in dwords: */
 327                 off = submit_reloc.submit_offset / 4;
 328
 329                 if ((off >= (obj->base.size / 4)) ||
 330                                 (off < last_offset)) {
 331                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 332                         return -EINVAL;
 333                 }
 334
 335                 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
 336                 if (ret)
 337                         return ret;
 338
 339                 if (valid)
 340                         continue;
 341
 342                 iova += submit_reloc.reloc_offset;
 343
 344                 if (submit_reloc.shift < 0)
 345                         iova >>= -submit_reloc.shift;
 346                 else
 347                         iova <<= submit_reloc.shift;
 348
 349                 ptr[off] = iova | submit_reloc.or;
 350
 351                 last_offset = off;
 352         }
 353
 354         msm_gem_put_vaddr_locked(&obj->base);
 355
 356         return 0;
 357 }
 358
 359 static void submit_cleanup(struct msm_gem_submit *submit)
 360 {
 361         unsigned i;
 362
 363         for (i = 0; i < submit->nr_bos; i++) {
 364                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 365                 submit_unlock_unpin_bo(submit, i);
 366                 list_del_init(&msm_obj->submit_entry);
 367                 drm_gem_object_unreference(&msm_obj->base);
 368         }
 369
 370         ww_acquire_fini(&submit->ticket);
 371 }
 372
 373 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 374                 struct drm_file *file)
 375 {
 376         struct msm_drm_private *priv = dev->dev_private;
 377         struct drm_msm_gem_submit *args = data;
 378         struct msm_file_private *ctx = file->driver_priv;
 379         struct msm_gem_submit *submit;
 380         struct msm_gpu *gpu = priv->gpu;
 381         unsigned i;
 382         int ret;
 383
 384         if (!gpu)
 385                 return -ENXIO;
 386
 387         /* for now, we just have 3d pipe.. eventually this would need to
 388          * be more clever to dispatch to appropriate gpu module:
 389          */
 390         if (args->pipe != MSM_PIPE_3D0)
 391                 return -EINVAL;
 392
 393         ret = mutex_lock_interruptible(&dev->struct_mutex);
 394         if (ret)
 395                 return ret;
 396
 397         priv->struct_mutex_task = current;
 398
 399         submit = submit_create(dev, gpu, args->nr_bos, args->nr_cmds);
 400         if (!submit) {
 401                 ret = -ENOMEM;
 402                 goto out_unlock;
 403         }
 404
 405         ret = submit_lookup_objects(submit, args, file);
 406         if (ret)
 407                 goto out;
 408
 409         ret = submit_lock_objects(submit);
 410         if (ret)
 411                 goto out;
 412
 413         ret = submit_fence_sync(submit);
 414         if (ret)
 415                 goto out;
 416
 417         ret = submit_pin_objects(submit);
 418         if (ret)
 419                 goto out;
 420
 421         for (i = 0; i < args->nr_cmds; i++) {
 422                 struct drm_msm_gem_submit_cmd submit_cmd;
 423                 void __user *userptr =
 424                         u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
 425                 struct msm_gem_object *msm_obj;
 426                 uint32_t iova;
 427
 428                 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
 429                 if (ret) {
 430                         ret = -EFAULT;
 431                         goto out;
 432                 }
 433
 434                 /* validate input from userspace: */
 435                 switch (submit_cmd.type) {
 436                 case MSM_SUBMIT_CMD_BUF:
 437                 case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 438                 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
 439                         break;
 440                 default:
 441                         DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
 442                         ret = -EINVAL;
 443                         goto out;
 444                 }
 445
 446                 ret = submit_bo(submit, submit_cmd.submit_idx,
 447                                 &msm_obj, &iova, NULL);
 448                 if (ret)
 449                         goto out;
 450
 451                 if (submit_cmd.size % 4) {
 452                         DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 453                                         submit_cmd.size);
 454                         ret = -EINVAL;
 455                         goto out;
 456                 }
 457
 458                 if ((submit_cmd.size + submit_cmd.submit_offset) >=
 459                                 msm_obj->base.size) {
 460                         DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size);
 461                         ret = -EINVAL;
 462                         goto out;
 463                 }
 464
 465                 submit->cmd[i].type = submit_cmd.type;
 466                 submit->cmd[i].size = submit_cmd.size / 4;
 467                 submit->cmd[i].iova = iova + submit_cmd.submit_offset;
 468                 submit->cmd[i].idx  = submit_cmd.submit_idx;
 469
 470                 if (submit->valid)
 471                         continue;
 472
 473                 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset,
 474                                 submit_cmd.nr_relocs, submit_cmd.relocs);
 475                 if (ret)
 476                         goto out;
 477         }
 478
 479         submit->nr_cmds = i;
 480
 481         ret = msm_gpu_submit(gpu, submit, ctx);
 482
 483         args->fence = submit->fence->seqno;
 484
 485 out:
 486         submit_cleanup(submit);
 487         if (ret)
 488                 msm_gem_submit_free(submit);
 489 out_unlock:
 490         priv->struct_mutex_task = NULL;
 491         mutex_unlock(&dev->struct_mutex);
 492         return ret;
 493 }