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 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 msm_gem_submit *submit_create(struct drm_device *dev, 37 struct msm_gpu *gpu, int nr) 38 { 39 struct msm_gem_submit *submit; 40 int sz = sizeof(*submit) + (nr * sizeof(submit->bos[0])); 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 submit->nr_cmds = 0; 50 51 INIT_LIST_HEAD(&submit->bo_list); 52 ww_acquire_init(&submit->ticket, &reservation_ww_class); 53 } 54 55 return submit; 56 } 57 58 static int submit_lookup_objects(struct msm_gem_submit *submit, 59 struct drm_msm_gem_submit *args, struct drm_file *file) 60 { 61 unsigned i; 62 int ret = 0; 63 64 spin_lock(&file->table_lock); 65 66 for (i = 0; i < args->nr_bos; i++) { 67 struct drm_msm_gem_submit_bo submit_bo; 68 struct drm_gem_object *obj; 69 struct msm_gem_object *msm_obj; 70 void __user *userptr = 71 to_user_ptr(args->bos + (i * sizeof(submit_bo))); 72 73 ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo)); 74 if (ret) { 75 ret = -EFAULT; 76 goto out_unlock; 77 } 78 79 if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) { 80 DRM_ERROR("invalid flags: %x\n", submit_bo.flags); 81 ret = -EINVAL; 82 goto out_unlock; 83 } 84 85 submit->bos[i].flags = submit_bo.flags; 86 /* in validate_objects() we figure out if this is true: */ 87 submit->bos[i].iova = submit_bo.presumed; 88 89 /* normally use drm_gem_object_lookup(), but for bulk lookup 90 * all under single table_lock just hit object_idr directly: 91 */ 92 obj = idr_find(&file->object_idr, submit_bo.handle); 93 if (!obj) { 94 DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i); 95 ret = -EINVAL; 96 goto out_unlock; 97 } 98 99 msm_obj = to_msm_bo(obj); 100 101 if (!list_empty(&msm_obj->submit_entry)) { 102 DRM_ERROR("handle %u at index %u already on submit list\n", 103 submit_bo.handle, i); 104 ret = -EINVAL; 105 goto out_unlock; 106 } 107 108 drm_gem_object_reference(obj); 109 110 submit->bos[i].obj = msm_obj; 111 112 list_add_tail(&msm_obj->submit_entry, &submit->bo_list); 113 } 114 115 out_unlock: 116 submit->nr_bos = i; 117 spin_unlock(&file->table_lock); 118 119 return ret; 120 } 121 122 static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i) 123 { 124 struct msm_gem_object *msm_obj = submit->bos[i].obj; 125 126 if (submit->bos[i].flags & BO_PINNED) 127 msm_gem_put_iova(&msm_obj->base, submit->gpu->id); 128 129 if (submit->bos[i].flags & BO_LOCKED) 130 ww_mutex_unlock(&msm_obj->resv->lock); 131 132 if (!(submit->bos[i].flags & BO_VALID)) 133 submit->bos[i].iova = 0; 134 135 submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED); 136 } 137 138 /* This is where we make sure all the bo's are reserved and pin'd: */ 139 static int submit_validate_objects(struct msm_gem_submit *submit) 140 { 141 int contended, slow_locked = -1, i, ret = 0; 142 143 retry: 144 submit->valid = true; 145 146 for (i = 0; i < submit->nr_bos; i++) { 147 struct msm_gem_object *msm_obj = submit->bos[i].obj; 148 uint32_t iova; 149 150 if (slow_locked == i) 151 slow_locked = -1; 152 153 contended = i; 154 155 if (!(submit->bos[i].flags & BO_LOCKED)) { 156 ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock, 157 &submit->ticket); 158 if (ret) 159 goto fail; 160 submit->bos[i].flags |= BO_LOCKED; 161 } 162 163 164 /* if locking succeeded, pin bo: */ 165 ret = msm_gem_get_iova_locked(&msm_obj->base, 166 submit->gpu->id, &iova); 167 168 /* this would break the logic in the fail path.. there is no 169 * reason for this to happen, but just to be on the safe side 170 * let's notice if this starts happening in the future: 171 */ 172 WARN_ON(ret == -EDEADLK); 173 174 if (ret) 175 goto fail; 176 177 submit->bos[i].flags |= BO_PINNED; 178 179 if (iova == submit->bos[i].iova) { 180 submit->bos[i].flags |= BO_VALID; 181 } else { 182 submit->bos[i].iova = iova; 183 submit->bos[i].flags &= ~BO_VALID; 184 submit->valid = false; 185 } 186 } 187 188 ww_acquire_done(&submit->ticket); 189 190 return 0; 191 192 fail: 193 for (; i >= 0; i--) 194 submit_unlock_unpin_bo(submit, i); 195 196 if (slow_locked > 0) 197 submit_unlock_unpin_bo(submit, slow_locked); 198 199 if (ret == -EDEADLK) { 200 struct msm_gem_object *msm_obj = submit->bos[contended].obj; 201 /* we lost out in a seqno race, lock and retry.. */ 202 ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock, 203 &submit->ticket); 204 if (!ret) { 205 submit->bos[contended].flags |= BO_LOCKED; 206 slow_locked = contended; 207 goto retry; 208 } 209 } 210 211 return ret; 212 } 213 214 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx, 215 struct msm_gem_object **obj, uint32_t *iova, bool *valid) 216 { 217 if (idx >= submit->nr_bos) { 218 DRM_ERROR("invalid buffer index: %u (out of %u)\n", 219 idx, submit->nr_bos); 220 return -EINVAL; 221 } 222 223 if (obj) 224 *obj = submit->bos[idx].obj; 225 if (iova) 226 *iova = submit->bos[idx].iova; 227 if (valid) 228 *valid = !!(submit->bos[idx].flags & BO_VALID); 229 230 return 0; 231 } 232 233 /* process the reloc's and patch up the cmdstream as needed: */ 234 static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj, 235 uint32_t offset, uint32_t nr_relocs, uint64_t relocs) 236 { 237 uint32_t i, last_offset = 0; 238 uint32_t *ptr; 239 int ret; 240 241 if (offset % 4) { 242 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset); 243 return -EINVAL; 244 } 245 246 /* For now, just map the entire thing. Eventually we probably 247 * to do it page-by-page, w/ kmap() if not vmap()d.. 248 */ 249 ptr = msm_gem_vaddr_locked(&obj->base); 250 251 if (IS_ERR(ptr)) { 252 ret = PTR_ERR(ptr); 253 DBG("failed to map: %d", ret); 254 return ret; 255 } 256 257 for (i = 0; i < nr_relocs; i++) { 258 struct drm_msm_gem_submit_reloc submit_reloc; 259 void __user *userptr = 260 to_user_ptr(relocs + (i * sizeof(submit_reloc))); 261 uint32_t iova, off; 262 bool valid; 263 264 ret = copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc)); 265 if (ret) 266 return -EFAULT; 267 268 if (submit_reloc.submit_offset % 4) { 269 DRM_ERROR("non-aligned reloc offset: %u\n", 270 submit_reloc.submit_offset); 271 return -EINVAL; 272 } 273 274 /* offset in dwords: */ 275 off = submit_reloc.submit_offset / 4; 276 277 if ((off >= (obj->base.size / 4)) || 278 (off < last_offset)) { 279 DRM_ERROR("invalid offset %u at reloc %u\n", off, i); 280 return -EINVAL; 281 } 282 283 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid); 284 if (ret) 285 return ret; 286 287 if (valid) 288 continue; 289 290 iova += submit_reloc.reloc_offset; 291 292 if (submit_reloc.shift < 0) 293 iova >>= -submit_reloc.shift; 294 else 295 iova <<= submit_reloc.shift; 296 297 ptr[off] = iova | submit_reloc.or; 298 299 last_offset = off; 300 } 301 302 return 0; 303 } 304 305 static void submit_cleanup(struct msm_gem_submit *submit, bool fail) 306 { 307 unsigned i; 308 309 for (i = 0; i < submit->nr_bos; i++) { 310 struct msm_gem_object *msm_obj = submit->bos[i].obj; 311 submit_unlock_unpin_bo(submit, i); 312 list_del_init(&msm_obj->submit_entry); 313 drm_gem_object_unreference(&msm_obj->base); 314 } 315 316 ww_acquire_fini(&submit->ticket); 317 } 318 319 int msm_ioctl_gem_submit(struct drm_device *dev, void *data, 320 struct drm_file *file) 321 { 322 struct msm_drm_private *priv = dev->dev_private; 323 struct drm_msm_gem_submit *args = data; 324 struct msm_file_private *ctx = file->driver_priv; 325 struct msm_gem_submit *submit; 326 struct msm_gpu *gpu; 327 unsigned i; 328 int ret; 329 330 /* for now, we just have 3d pipe.. eventually this would need to 331 * be more clever to dispatch to appropriate gpu module: 332 */ 333 if (args->pipe != MSM_PIPE_3D0) 334 return -EINVAL; 335 336 gpu = priv->gpu; 337 338 if (args->nr_cmds > MAX_CMDS) 339 return -EINVAL; 340 341 mutex_lock(&dev->struct_mutex); 342 343 submit = submit_create(dev, gpu, args->nr_bos); 344 if (!submit) { 345 ret = -ENOMEM; 346 goto out; 347 } 348 349 ret = submit_lookup_objects(submit, args, file); 350 if (ret) 351 goto out; 352 353 ret = submit_validate_objects(submit); 354 if (ret) 355 goto out; 356 357 for (i = 0; i < args->nr_cmds; i++) { 358 struct drm_msm_gem_submit_cmd submit_cmd; 359 void __user *userptr = 360 to_user_ptr(args->cmds + (i * sizeof(submit_cmd))); 361 struct msm_gem_object *msm_obj; 362 uint32_t iova; 363 364 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd)); 365 if (ret) { 366 ret = -EFAULT; 367 goto out; 368 } 369 370 /* validate input from userspace: */ 371 switch (submit_cmd.type) { 372 case MSM_SUBMIT_CMD_BUF: 373 case MSM_SUBMIT_CMD_IB_TARGET_BUF: 374 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF: 375 break; 376 default: 377 DRM_ERROR("invalid type: %08x\n", submit_cmd.type); 378 ret = -EINVAL; 379 goto out; 380 } 381 382 ret = submit_bo(submit, submit_cmd.submit_idx, 383 &msm_obj, &iova, NULL); 384 if (ret) 385 goto out; 386 387 if (submit_cmd.size % 4) { 388 DRM_ERROR("non-aligned cmdstream buffer size: %u\n", 389 submit_cmd.size); 390 ret = -EINVAL; 391 goto out; 392 } 393 394 if ((submit_cmd.size + submit_cmd.submit_offset) >= 395 msm_obj->base.size) { 396 DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size); 397 ret = -EINVAL; 398 goto out; 399 } 400 401 submit->cmd[i].type = submit_cmd.type; 402 submit->cmd[i].size = submit_cmd.size / 4; 403 submit->cmd[i].iova = iova + submit_cmd.submit_offset; 404 submit->cmd[i].idx = submit_cmd.submit_idx; 405 406 if (submit->valid) 407 continue; 408 409 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset, 410 submit_cmd.nr_relocs, submit_cmd.relocs); 411 if (ret) 412 goto out; 413 } 414 415 submit->nr_cmds = i; 416 417 ret = msm_gpu_submit(gpu, submit, ctx); 418 419 args->fence = submit->fence; 420 421 out: 422 if (submit) 423 submit_cleanup(submit, !!ret); 424 mutex_unlock(&dev->struct_mutex); 425 return ret; 426 } 427