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 } 474