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 if (submit->bos[i].flags & BO_PINNED) 191 etnaviv_gem_mapping_unreference(submit->bos[i].mapping); 192 193 submit->bos[i].mapping = NULL; 194 submit->bos[i].flags &= ~BO_PINNED; 195 } 196 } 197 198 static int submit_pin_objects(struct etnaviv_gem_submit *submit) 199 { 200 int i, ret = 0; 201 202 for (i = 0; i < submit->nr_bos; i++) { 203 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 204 struct etnaviv_vram_mapping *mapping; 205 206 mapping = etnaviv_gem_mapping_get(&etnaviv_obj->base, 207 submit->gpu); 208 if (IS_ERR(mapping)) { 209 ret = PTR_ERR(mapping); 210 break; 211 } 212 213 submit->bos[i].flags |= BO_PINNED; 214 submit->bos[i].mapping = mapping; 215 } 216 217 return ret; 218 } 219 220 static int submit_bo(struct etnaviv_gem_submit *submit, u32 idx, 221 struct etnaviv_gem_submit_bo **bo) 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 *bo = &submit->bos[idx]; 230 231 return 0; 232 } 233 234 /* process the reloc's and patch up the cmdstream as needed: */ 235 static int submit_reloc(struct etnaviv_gem_submit *submit, void *stream, 236 u32 size, const struct drm_etnaviv_gem_submit_reloc *relocs, 237 u32 nr_relocs) 238 { 239 u32 i, last_offset = 0; 240 u32 *ptr = stream; 241 int ret; 242 243 for (i = 0; i < nr_relocs; i++) { 244 const struct drm_etnaviv_gem_submit_reloc *r = relocs + i; 245 struct etnaviv_gem_submit_bo *bo; 246 u32 off; 247 248 if (unlikely(r->flags)) { 249 DRM_ERROR("invalid reloc flags\n"); 250 return -EINVAL; 251 } 252 253 if (r->submit_offset % 4) { 254 DRM_ERROR("non-aligned reloc offset: %u\n", 255 r->submit_offset); 256 return -EINVAL; 257 } 258 259 /* offset in dwords: */ 260 off = r->submit_offset / 4; 261 262 if ((off >= size ) || 263 (off < last_offset)) { 264 DRM_ERROR("invalid offset %u at reloc %u\n", off, i); 265 return -EINVAL; 266 } 267 268 ret = submit_bo(submit, r->reloc_idx, &bo); 269 if (ret) 270 return ret; 271 272 if (r->reloc_offset >= bo->obj->base.size - sizeof(*ptr)) { 273 DRM_ERROR("relocation %u outside object", i); 274 return -EINVAL; 275 } 276 277 ptr[off] = bo->mapping->iova + r->reloc_offset; 278 279 last_offset = off; 280 } 281 282 return 0; 283 } 284 285 static void submit_cleanup(struct etnaviv_gem_submit *submit) 286 { 287 unsigned i; 288 289 for (i = 0; i < submit->nr_bos; i++) { 290 struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj; 291 292 submit_unlock_object(submit, i); 293 drm_gem_object_unreference_unlocked(&etnaviv_obj->base); 294 } 295 296 ww_acquire_fini(&submit->ticket); 297 kfree(submit); 298 } 299 300 int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data, 301 struct drm_file *file) 302 { 303 struct etnaviv_drm_private *priv = dev->dev_private; 304 struct drm_etnaviv_gem_submit *args = data; 305 struct drm_etnaviv_gem_submit_reloc *relocs; 306 struct drm_etnaviv_gem_submit_bo *bos; 307 struct etnaviv_gem_submit *submit; 308 struct etnaviv_cmdbuf *cmdbuf; 309 struct etnaviv_gpu *gpu; 310 void *stream; 311 int ret; 312 313 if (args->pipe >= ETNA_MAX_PIPES) 314 return -EINVAL; 315 316 gpu = priv->gpu[args->pipe]; 317 if (!gpu) 318 return -ENXIO; 319 320 if (args->stream_size % 4) { 321 DRM_ERROR("non-aligned cmdstream buffer size: %u\n", 322 args->stream_size); 323 return -EINVAL; 324 } 325 326 if (args->exec_state != ETNA_PIPE_3D && 327 args->exec_state != ETNA_PIPE_2D && 328 args->exec_state != ETNA_PIPE_VG) { 329 DRM_ERROR("invalid exec_state: 0x%x\n", args->exec_state); 330 return -EINVAL; 331 } 332 333 /* 334 * Copy the command submission and bo array to kernel space in 335 * one go, and do this outside of any locks. 336 */ 337 bos = drm_malloc_ab(args->nr_bos, sizeof(*bos)); 338 relocs = drm_malloc_ab(args->nr_relocs, sizeof(*relocs)); 339 stream = drm_malloc_ab(1, args->stream_size); 340 cmdbuf = etnaviv_gpu_cmdbuf_new(gpu, ALIGN(args->stream_size, 8) + 8, 341 args->nr_bos); 342 if (!bos || !relocs || !stream || !cmdbuf) { 343 ret = -ENOMEM; 344 goto err_submit_cmds; 345 } 346 347 cmdbuf->exec_state = args->exec_state; 348 cmdbuf->ctx = file->driver_priv; 349 350 ret = copy_from_user(bos, to_user_ptr(args->bos), 351 args->nr_bos * sizeof(*bos)); 352 if (ret) { 353 ret = -EFAULT; 354 goto err_submit_cmds; 355 } 356 357 ret = copy_from_user(relocs, to_user_ptr(args->relocs), 358 args->nr_relocs * sizeof(*relocs)); 359 if (ret) { 360 ret = -EFAULT; 361 goto err_submit_cmds; 362 } 363 364 ret = copy_from_user(stream, to_user_ptr(args->stream), 365 args->stream_size); 366 if (ret) { 367 ret = -EFAULT; 368 goto err_submit_cmds; 369 } 370 371 submit = submit_create(dev, gpu, args->nr_bos); 372 if (!submit) { 373 ret = -ENOMEM; 374 goto err_submit_cmds; 375 } 376 377 ret = submit_lookup_objects(submit, file, bos, args->nr_bos); 378 if (ret) 379 goto err_submit_objects; 380 381 ret = submit_lock_objects(submit); 382 if (ret) 383 goto err_submit_objects; 384 385 if (!etnaviv_cmd_validate_one(gpu, stream, args->stream_size / 4, 386 relocs, args->nr_relocs)) { 387 ret = -EINVAL; 388 goto err_submit_objects; 389 } 390 391 ret = submit_fence_sync(submit); 392 if (ret) 393 goto err_submit_objects; 394 395 ret = submit_pin_objects(submit); 396 if (ret) 397 goto out; 398 399 ret = submit_reloc(submit, stream, args->stream_size / 4, 400 relocs, args->nr_relocs); 401 if (ret) 402 goto out; 403 404 memcpy(cmdbuf->vaddr, stream, args->stream_size); 405 cmdbuf->user_size = ALIGN(args->stream_size, 8); 406 407 ret = etnaviv_gpu_submit(gpu, submit, cmdbuf); 408 if (ret == 0) 409 cmdbuf = NULL; 410 411 args->fence = submit->fence; 412 413 out: 414 submit_unpin_objects(submit); 415 416 /* 417 * If we're returning -EAGAIN, it may be due to the userptr code 418 * wanting to run its workqueue outside of any locks. Flush our 419 * workqueue to ensure that it is run in a timely manner. 420 */ 421 if (ret == -EAGAIN) 422 flush_workqueue(priv->wq); 423 424 err_submit_objects: 425 submit_cleanup(submit); 426 427 err_submit_cmds: 428 /* if we still own the cmdbuf */ 429 if (cmdbuf) 430 etnaviv_gpu_cmdbuf_free(cmdbuf); 431 if (stream) 432 drm_free_large(stream); 433 if (bos) 434 drm_free_large(bos); 435 if (relocs) 436 drm_free_large(relocs); 437 438 return ret; 439 } 440