1 /* 2 * Copyright (C) 2015 Etnaviv Project 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <linux/reservation.h> 18 #include "etnaviv_drv.h" 19 #include "etnaviv_gpu.h" 20 #include "etnaviv_gem.h" 21 22 /* 23 * Cmdstream submission: 24 */ 25 26 #define BO_INVALID_FLAGS ~(ETNA_SUBMIT_BO_READ | ETNA_SUBMIT_BO_WRITE) 27 /* make sure these don't conflict w/ ETNAVIV_SUBMIT_BO_x */ 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 etnaviv_gem_submit *submit_create(struct drm_device *dev, 37 struct etnaviv_gpu *gpu, size_t nr) 38 { 39 struct etnaviv_gem_submit *submit; 40 size_t sz = size_vstruct(nr, sizeof(submit->bos[0]), sizeof(*submit)); 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 50 ww_acquire_init(&submit->ticket, &reservation_ww_class); 51 } 52 53 return submit; 54 } 55 56 static int submit_lookup_objects(struct etnaviv_gem_submit *submit, 57 struct drm_file *file, struct drm_etnaviv_gem_submit_bo *submit_bos, 58 unsigned nr_bos) 59 { 60 struct drm_etnaviv_gem_submit_bo *bo; 61 unsigned i; 62 int ret = 0; 63 64 spin_lock(&file->table_lock); 65 66 for (i = 0, bo = submit_bos; i < nr_bos; i++, bo++) { 67 struct drm_gem_object *obj; 68 69 if (bo->flags & BO_INVALID_FLAGS) { 70 DRM_ERROR("invalid flags: %x\n", bo->flags); 71 ret = -EINVAL; 72 goto out_unlock; 73 } 74 75 submit->bos[i].flags = bo->flags; 76 77 /* normally use drm_gem_object_lookup(), but for bulk lookup 78 * all under single table_lock just hit object_idr directly: 79 */ 80 obj = idr_find(&file->object_idr, bo->handle); 81 if (!obj) { 82 DRM_ERROR("invalid handle %u at index %u\n", 83 bo->handle, i); 84 ret = -EINVAL; 85 goto out_unlock; 86 } 87 88 /* 89 * Take a refcount on the object. The file table lock 90 * prevents the object_idr's refcount on this being dropped. 91 */ 92 drm_gem_object_reference(obj); 93 94 submit->bos[i].obj = to_etnaviv_bo(obj); 95 } 96 97 out_unlock: 98 submit->nr_bos = i; 99 spin_unlock(&file->table_lock); 100 101 return ret; 102 } 103 104 static void submit_unlock_object(struct etnaviv_gem_submit *submit, int i) 105 { 106 if (submit->bos[i].flags & BO_LOCKED) { 107 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 108 109 ww_mutex_unlock(&etnaviv_obj->resv->lock); 110 submit->bos[i].flags &= ~BO_LOCKED; 111 } 112 } 113 114 static int submit_lock_objects(struct etnaviv_gem_submit *submit) 115 { 116 int contended, slow_locked = -1, i, ret = 0; 117 118 retry: 119 for (i = 0; i < submit->nr_bos; i++) { 120 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 121 122 if (slow_locked == i) 123 slow_locked = -1; 124 125 contended = i; 126 127 if (!(submit->bos[i].flags & BO_LOCKED)) { 128 ret = ww_mutex_lock_interruptible(&etnaviv_obj->resv->lock, 129 &submit->ticket); 130 if (ret == -EALREADY) 131 DRM_ERROR("BO at index %u already on submit list\n", 132 i); 133 if (ret) 134 goto fail; 135 submit->bos[i].flags |= BO_LOCKED; 136 } 137 } 138 139 ww_acquire_done(&submit->ticket); 140 141 return 0; 142 143 fail: 144 for (; i >= 0; i--) 145 submit_unlock_object(submit, i); 146 147 if (slow_locked > 0) 148 submit_unlock_object(submit, slow_locked); 149 150 if (ret == -EDEADLK) { 151 struct etnaviv_gem_object *etnaviv_obj; 152 153 etnaviv_obj = submit->bos[contended].obj; 154 155 /* we lost out in a seqno race, lock and retry.. */ 156 ret = ww_mutex_lock_slow_interruptible(&etnaviv_obj->resv->lock, 157 &submit->ticket); 158 if (!ret) { 159 submit->bos[contended].flags |= BO_LOCKED; 160 slow_locked = contended; 161 goto retry; 162 } 163 } 164 165 return ret; 166 } 167 168 static int submit_fence_sync(const struct etnaviv_gem_submit *submit) 169 { 170 unsigned int context = submit->gpu->fence_context; 171 int i, ret = 0; 172 173 for (i = 0; i < submit->nr_bos; i++) { 174 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 175 bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE; 176 177 ret = etnaviv_gpu_fence_sync_obj(etnaviv_obj, context, write); 178 if (ret) 179 break; 180 } 181 182 return ret; 183 } 184 185 static void submit_unpin_objects(struct etnaviv_gem_submit *submit) 186 { 187 int i; 188 189 for (i = 0; i < submit->nr_bos; i++) { 190 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 191 192 if (submit->bos[i].flags & BO_PINNED) 193 etnaviv_gem_put_iova(submit->gpu, &etnaviv_obj->base); 194 195 submit->bos[i].iova = 0; 196 submit->bos[i].flags &= ~BO_PINNED; 197 } 198 } 199 200 static int submit_pin_objects(struct etnaviv_gem_submit *submit) 201 { 202 int i, ret = 0; 203 204 for (i = 0; i < submit->nr_bos; i++) { 205 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 206 u32 iova; 207 208 ret = etnaviv_gem_get_iova(submit->gpu, &etnaviv_obj->base, 209 &iova); 210 if (ret) 211 break; 212 213 submit->bos[i].flags |= BO_PINNED; 214 submit->bos[i].iova = iova; 215 } 216 217 return ret; 218 } 219 220 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx, 221 struct etnaviv_gem_object **obj, u32 *iova) 222 { 223 if (idx >= submit->nr_bos) { 224 DRM_ERROR("invalid buffer index: %u (out of %u)\n", 225 idx, submit->nr_bos); 226 return -EINVAL; 227 } 228 229 if (obj) 230 *obj = submit->bos[idx].obj; 231 if (iova) 232 *iova = submit->bos[idx].iova; 233 234 return 0; 235 } 236 237 /* process the reloc's and patch up the cmdstream as needed: */ 238 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream, 239 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs, 240 u32 nr_relocs) 241 { 242 u32 i, last_offset = 0; 243 u32 *ptr = stream; 244 int ret; 245 246 for (i = 0; i < nr_relocs; i++) { 247 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i; 248 struct etnaviv_gem_object *bobj; 249 u32 iova, off; 250 251 if (unlikely(r->flags)) { 252 DRM_ERROR("invalid reloc flags\n"); 253 return -EINVAL; 254 } 255 256 if (r->submit_offset % 4) { 257 DRM_ERROR("non-aligned reloc offset: %u\n", 258 r->submit_offset); 259 return -EINVAL; 260 } 261 262 /* offset in dwords: */ 263 off = r->submit_offset / 4; 264 265 if ((off >= size ) || 266 (off < last_offset)) { 267 DRM_ERROR("invalid offset %u at reloc %u\n", off, i); 268 return -EINVAL; 269 } 270 271 ret = submit_bo(submit, r->reloc_idx, &bobj, &iova); 272 if (ret) 273 return ret; 274 275 if (r->reloc_offset >= 276 bobj->base.size - sizeof(*ptr)) { 277 DRM_ERROR("relocation %u outside object", i); 278 return -EINVAL; 279 } 280 281 ptr[off] = iova + r->reloc_offset; 282 283 last_offset = off; 284 } 285 286 return 0; 287 } 288 289 static void submit_cleanup(struct etnaviv_gem_submit *submit) 290 { 291 unsigned i; 292 293 for (i = 0; i < submit->nr_bos; i++) { 294 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 295 296 submit_unlock_object(submit, i); 297 drm_gem_object_unreference_unlocked(&etnaviv_obj->base); 298 } 299 300 ww_acquire_fini(&submit->ticket); 301 kfree(submit); 302 } 303 304 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data, 305 struct drm_file *file) 306 { 307 struct etnaviv_drm_private *priv = dev->dev_private; 308 struct drm_etnaviv_gem_submit *args = data; 309 struct drm_etnaviv_gem_submit_reloc *relocs; 310 struct drm_etnaviv_gem_submit_bo *bos; 311 struct etnaviv_gem_submit *submit; 312 struct etnaviv_cmdbuf *cmdbuf; 313 struct etnaviv_gpu *gpu; 314 void *stream; 315 int ret; 316 317 if (args->pipe >= ETNA_MAX_PIPES) 318 return -EINVAL; 319 320 gpu = priv->gpu[args->pipe]; 321 if (!gpu) 322 return -ENXIO; 323 324 if (args->stream_size % 4) { 325 DRM_ERROR("non-aligned cmdstream buffer size: %u\n", 326 args->stream_size); 327 return -EINVAL; 328 } 329 330 if (args->exec_state != ETNA_PIPE_3D && 331 args->exec_state != ETNA_PIPE_2D && 332 args->exec_state != ETNA_PIPE_VG) { 333 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state); 334 return -EINVAL; 335 } 336 337 /* 338 * Copy the command submission and bo array to kernel space in 339 * one go, and do this outside of any locks. 340 */ 341 bos = drm_malloc_ab(args->nr_bos, sizeof(*bos)); 342 relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs)); 343 stream = drm_malloc_ab(1, args->stream_size); 344 cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8, 345 args->nr_bos); 346 if (!bos || !relocs || !stream || !cmdbuf) { 347 ret = -ENOMEM; 348 goto err_submit_cmds; 349 } 350 351 cmdbuf->exec_state = args->exec_state; 352 cmdbuf->ctx = file->driver_priv; 353 354 ret = copy_from_user(bos, to_user_ptr(args->bos), 355 args->nr_bos * sizeof(*bos)); 356 if (ret) { 357 ret = -EFAULT; 358 goto err_submit_cmds; 359 } 360 361 ret = copy_from_user(relocs, to_user_ptr(args->relocs), 362 args->nr_relocs * sizeof(*relocs)); 363 if (ret) { 364 ret = -EFAULT; 365 goto err_submit_cmds; 366 } 367 368 ret = copy_from_user(stream, to_user_ptr(args->stream), 369 args->stream_size); 370 if (ret) { 371 ret = -EFAULT; 372 goto err_submit_cmds; 373 } 374 375 submit = submit_create(dev, gpu, args->nr_bos); 376 if (!submit) { 377 ret = -ENOMEM; 378 goto err_submit_cmds; 379 } 380 381 ret = submit_lookup_objects(submit, file, bos, args->nr_bos); 382 if (ret) 383 goto err_submit_objects; 384 385 ret = submit_lock_objects(submit); 386 if (ret) 387 goto err_submit_objects; 388 389 if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4, 390 relocs, args->nr_relocs)) { 391 ret = -EINVAL; 392 goto err_submit_objects; 393 } 394 395 ret = submit_fence_sync(submit); 396 if (ret) 397 goto err_submit_objects; 398 399 ret = submit_pin_objects(submit); 400 if (ret) 401 goto out; 402 403 ret = submit_reloc(submit, stream, args->stream_size / 4, 404 relocs, args->nr_relocs); 405 if (ret) 406 goto out; 407 408 memcpy(cmdbuf->vaddr, stream, args->stream_size); 409 cmdbuf->user_size = ALIGN(args->stream_size, 8); 410 411 ret = etnaviv_gpu_submit(gpu, submit, cmdbuf); 412 if (ret == 0) 413 cmdbuf = NULL; 414 415 args->fence = submit->fence; 416 417 out: 418 submit_unpin_objects(submit); 419 420 /* 421 * If we're returning -EAGAIN, it may be due to the userptr code 422 * wanting to run its workqueue outside of any locks. Flush our 423 * workqueue to ensure that it is run in a timely manner. 424 */ 425 if (ret == -EAGAIN) 426 flush_workqueue(priv->wq); 427 428 err_submit_objects: 429 submit_cleanup(submit); 430 431 err_submit_cmds: 432 /* if we still own the cmdbuf */ 433 if (cmdbuf) 434 etnaviv_gpu_cmdbuf_free(cmdbuf); 435 if (stream) 436 drm_free_large(stream); 437 if (bos) 438 drm_free_large(bos); 439 if (relocs) 440 drm_free_large(relocs); 441 442 return ret; 443 } 444