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