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 int submit_lookup_objects(struct msm_gem_submit *submit,
  68                 struct drm_msm_gem_submit *args, struct drm_file *file)
  69 {
  70         unsigned i;
  71         int ret = 0;
  72
  73         spin_lock(&file->table_lock);
  74
  75         for (i = 0; i < args->nr_bos; i++) {
  76                 struct drm_msm_gem_submit_bo submit_bo;
  77                 struct drm_gem_object *obj;
  78                 struct msm_gem_object *msm_obj;
  79                 void __user *userptr =
  80                         u64_to_user_ptr(args->bos + (i * sizeof(submit_bo)));
  81
  82                 /* make sure we don't have garbage flags, in case we hit
  83                  * error path before flags is initialized:
  84                  */
  85                 submit->bos[i].flags = 0;
  86
  87                 ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo));
  88                 if (ret) {
  89                         ret = -EFAULT;
  90                         goto out_unlock;
  91                 }
  92
  93                 if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) {
  94                         DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
  95                         ret = -EINVAL;
  96                         goto out_unlock;
  97                 }
  98
  99                 submit->bos[i].flags = submit_bo.flags;
 100                 /* in validate_objects() we figure out if this is true: */
 101                 submit->bos[i].iova  = submit_bo.presumed;
 102
 103                 /* normally use drm_gem_object_lookup(), but for bulk lookup
 104                  * all under single table_lock just hit object_idr directly:
 105                  */
 106                 obj = idr_find(&file->object_idr, submit_bo.handle);
 107                 if (!obj) {
 108                         DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i);
 109                         ret = -EINVAL;
 110                         goto out_unlock;
 111                 }
 112
 113                 msm_obj = to_msm_bo(obj);
 114
 115                 if (!list_empty(&msm_obj->submit_entry)) {
 116                         DRM_ERROR("handle %u at index %u already on submit list\n",
 117                                         submit_bo.handle, i);
 118                         ret = -EINVAL;
 119                         goto out_unlock;
 120                 }
 121
 122                 drm_gem_object_reference(obj);
 123
 124                 submit->bos[i].obj = msm_obj;
 125
 126                 list_add_tail(&msm_obj->submit_entry, &submit->bo_list);
 127         }
 128
 129 out_unlock:
 130         submit->nr_bos = i;
 131         spin_unlock(&file->table_lock);
 132
 133         return ret;
 134 }
 135
 136 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
 137 {
 138         struct msm_gem_object *msm_obj = submit->bos[i].obj;
 139
 140         if (submit->bos[i].flags & BO_PINNED)
 141                 msm_gem_put_iova(&msm_obj->base, submit->gpu->id);
 142
 143         if (submit->bos[i].flags & BO_LOCKED)
 144                 ww_mutex_unlock(&msm_obj->resv->lock);
 145
 146         if (!(submit->bos[i].flags & BO_VALID))
 147                 submit->bos[i].iova = 0;
 148
 149         submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED);
 150 }
 151
 152 /* This is where we make sure all the bo's are reserved and pin'd: */
 153 static int submit_lock_objects(struct msm_gem_submit *submit)
 154 {
 155         int contended, slow_locked = -1, i, ret = 0;
 156
 157 retry:
 158         for (i = 0; i < submit->nr_bos; i++) {
 159                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 160
 161                 if (slow_locked == i)
 162                         slow_locked = -1;
 163
 164                 contended = i;
 165
 166                 if (!(submit->bos[i].flags & BO_LOCKED)) {
 167                         ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock,
 168                                         &submit->ticket);
 169                         if (ret)
 170                                 goto fail;
 171                         submit->bos[i].flags |= BO_LOCKED;
 172                 }
 173         }
 174
 175         ww_acquire_done(&submit->ticket);
 176
 177         return 0;
 178
 179 fail:
 180         for (; i >= 0; i--)
 181                 submit_unlock_unpin_bo(submit, i);
 182
 183         if (slow_locked > 0)
 184                 submit_unlock_unpin_bo(submit, slow_locked);
 185
 186         if (ret == -EDEADLK) {
 187                 struct msm_gem_object *msm_obj = submit->bos[contended].obj;
 188                 /* we lost out in a seqno race, lock and retry.. */
 189                 ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock,
 190                                 &submit->ticket);
 191                 if (!ret) {
 192                         submit->bos[contended].flags |= BO_LOCKED;
 193                         slow_locked = contended;
 194                         goto retry;
 195                 }
 196         }
 197
 198         return ret;
 199 }
 200
 201 static int submit_fence_sync(struct msm_gem_submit *submit)
 202 {
 203         int i, ret = 0;
 204
 205         for (i = 0; i < submit->nr_bos; i++) {
 206                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 207                 bool write = submit->bos[i].flags & MSM_SUBMIT_BO_WRITE;
 208
 209                 ret = msm_gem_sync_object(&msm_obj->base, submit->gpu->fctx, write);
 210                 if (ret)
 211                         break;
 212         }
 213
 214         return ret;
 215 }
 216
 217 static int submit_pin_objects(struct msm_gem_submit *submit)
 218 {
 219         int i, ret = 0;
 220
 221         submit->valid = true;
 222
 223         for (i = 0; i < submit->nr_bos; i++) {
 224                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 225                 uint32_t iova;
 226
 227                 /* if locking succeeded, pin bo: */
 228                 ret = msm_gem_get_iova_locked(&msm_obj->base,
 229                                 submit->gpu->id, &iova);
 230
 231                 if (ret)
 232                         break;
 233
 234                 submit->bos[i].flags |= BO_PINNED;
 235
 236                 if (iova == submit->bos[i].iova) {
 237                         submit->bos[i].flags |= BO_VALID;
 238                 } else {
 239                         submit->bos[i].iova = iova;
 240                         /* iova changed, so address in cmdstream is not valid: */
 241                         submit->bos[i].flags &= ~BO_VALID;
 242                         submit->valid = false;
 243                 }
 244         }
 245
 246         return ret;
 247 }
 248
 249 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 250                 struct msm_gem_object **obj, uint32_t *iova, bool *valid)
 251 {
 252         if (idx >= submit->nr_bos) {
 253                 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 254                                 idx, submit->nr_bos);
 255                 return -EINVAL;
 256         }
 257
 258         if (obj)
 259                 *obj = submit->bos[idx].obj;
 260         if (iova)
 261                 *iova = submit->bos[idx].iova;
 262         if (valid)
 263                 *valid = !!(submit->bos[idx].flags & BO_VALID);
 264
 265         return 0;
 266 }
 267
 268 /* process the reloc's and patch up the cmdstream as needed: */
 269 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
 270                 uint32_t offset, uint32_t nr_relocs, uint64_t relocs)
 271 {
 272         uint32_t i, last_offset = 0;
 273         uint32_t *ptr;
 274         int ret;
 275
 276         if (offset % 4) {
 277                 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
 278                 return -EINVAL;
 279         }
 280
 281         /* For now, just map the entire thing.  Eventually we probably
 282          * to do it page-by-page, w/ kmap() if not vmap()d..
 283          */
 284         ptr = msm_gem_get_vaddr_locked(&obj->base);
 285
 286         if (IS_ERR(ptr)) {
 287                 ret = PTR_ERR(ptr);
 288                 DBG("failed to map: %d", ret);
 289                 return ret;
 290         }
 291
 292         for (i = 0; i < nr_relocs; i++) {
 293                 struct drm_msm_gem_submit_reloc submit_reloc;
 294                 void __user *userptr =
 295                         u64_to_user_ptr(relocs + (i * sizeof(submit_reloc)));
 296                 uint32_t iova, off;
 297                 bool valid;
 298
 299                 ret = copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc));
 300                 if (ret)
 301                         return -EFAULT;
 302
 303                 if (submit_reloc.submit_offset % 4) {
 304                         DRM_ERROR("non-aligned reloc offset: %u\n",
 305                                         submit_reloc.submit_offset);
 306                         return -EINVAL;
 307                 }
 308
 309                 /* offset in dwords: */
 310                 off = submit_reloc.submit_offset / 4;
 311
 312                 if ((off >= (obj->base.size / 4)) ||
 313                                 (off < last_offset)) {
 314                         DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
 315                         return -EINVAL;
 316                 }
 317
 318                 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
 319                 if (ret)
 320                         return ret;
 321
 322                 if (valid)
 323                         continue;
 324
 325                 iova += submit_reloc.reloc_offset;
 326
 327                 if (submit_reloc.shift < 0)
 328                         iova >>= -submit_reloc.shift;
 329                 else
 330                         iova <<= submit_reloc.shift;
 331
 332                 ptr[off] = iova | submit_reloc.or;
 333
 334                 last_offset = off;
 335         }
 336
 337         msm_gem_put_vaddr_locked(&obj->base);
 338
 339         return 0;
 340 }
 341
 342 static void submit_cleanup(struct msm_gem_submit *submit)
 343 {
 344         unsigned i;
 345
 346         for (i = 0; i < submit->nr_bos; i++) {
 347                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 348                 submit_unlock_unpin_bo(submit, i);
 349                 list_del_init(&msm_obj->submit_entry);
 350                 drm_gem_object_unreference(&msm_obj->base);
 351         }
 352
 353         ww_acquire_fini(&submit->ticket);
 354 }
 355
 356 int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 357                 struct drm_file *file)
 358 {
 359         struct msm_drm_private *priv = dev->dev_private;
 360         struct drm_msm_gem_submit *args = data;
 361         struct msm_file_private *ctx = file->driver_priv;
 362         struct msm_gem_submit *submit;
 363         struct msm_gpu *gpu = priv->gpu;
 364         unsigned i;
 365         int ret;
 366
 367         if (!gpu)
 368                 return -ENXIO;
 369
 370         /* for now, we just have 3d pipe.. eventually this would need to
 371          * be more clever to dispatch to appropriate gpu module:
 372          */
 373         if (args->pipe != MSM_PIPE_3D0)
 374                 return -EINVAL;
 375
 376         ret = mutex_lock_interruptible(&dev->struct_mutex);
 377         if (ret)
 378                 return ret;
 379
 380         submit = submit_create(dev, gpu, args->nr_bos, args->nr_cmds);
 381         if (!submit) {
 382                 ret = -ENOMEM;
 383                 goto out_unlock;
 384         }
 385
 386         ret = submit_lookup_objects(submit, args, file);
 387         if (ret)
 388                 goto out;
 389
 390         ret = submit_lock_objects(submit);
 391         if (ret)
 392                 goto out;
 393
 394         ret = submit_fence_sync(submit);
 395         if (ret)
 396                 goto out;
 397
 398         ret = submit_pin_objects(submit);
 399         if (ret)
 400                 goto out;
 401
 402         for (i = 0; i < args->nr_cmds; i++) {
 403                 struct drm_msm_gem_submit_cmd submit_cmd;
 404                 void __user *userptr =
 405                         u64_to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
 406                 struct msm_gem_object *msm_obj;
 407                 uint32_t iova;
 408
 409                 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
 410                 if (ret) {
 411                         ret = -EFAULT;
 412                         goto out;
 413                 }
 414
 415                 /* validate input from userspace: */
 416                 switch (submit_cmd.type) {
 417                 case MSM_SUBMIT_CMD_BUF:
 418                 case MSM_SUBMIT_CMD_IB_TARGET_BUF:
 419                 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
 420                         break;
 421                 default:
 422                         DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
 423                         ret = -EINVAL;
 424                         goto out;
 425                 }
 426
 427                 ret = submit_bo(submit, submit_cmd.submit_idx,
 428                                 &msm_obj, &iova, NULL);
 429                 if (ret)
 430                         goto out;
 431
 432                 if (submit_cmd.size % 4) {
 433                         DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
 434                                         submit_cmd.size);
 435                         ret = -EINVAL;
 436                         goto out;
 437                 }
 438
 439                 if ((submit_cmd.size + submit_cmd.submit_offset) >=
 440                                 msm_obj->base.size) {
 441                         DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size);
 442                         ret = -EINVAL;
 443                         goto out;
 444                 }
 445
 446                 submit->cmd[i].type = submit_cmd.type;
 447                 submit->cmd[i].size = submit_cmd.size / 4;
 448                 submit->cmd[i].iova = iova + submit_cmd.submit_offset;
 449                 submit->cmd[i].idx  = submit_cmd.submit_idx;
 450
 451                 if (submit->valid)
 452                         continue;
 453
 454                 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset,
 455                                 submit_cmd.nr_relocs, submit_cmd.relocs);
 456                 if (ret)
 457                         goto out;
 458         }
 459
 460         submit->nr_cmds = i;
 461
 462         ret = msm_gpu_submit(gpu, submit, ctx);
 463
 464         args->fence = submit->fence->seqno;
 465
 466 out:
 467         submit_cleanup(submit);
 468         if (ret)
 469                 msm_gem_submit_free(submit);
 470 out_unlock:
 471         mutex_unlock(&dev->struct_mutex);
 472         return ret;
 473 }