1 /* 2 * Copyright (C) 2008 Maarten Maathuis. 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining 6 * a copy of this software and associated documentation files (the 7 * "Software"), to deal in the Software without restriction, including 8 * without limitation the rights to use, copy, modify, merge, publish, 9 * distribute, sublicense, and/or sell copies of the Software, and to 10 * permit persons to whom the Software is furnished to do so, subject to 11 * the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the 14 * next paragraph) shall be included in all copies or substantial 15 * portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 * 25 */ 26 27 #include <acpi/video.h> 28 29 #include <drm/drm_atomic.h> 30 #include <drm/drm_atomic_helper.h> 31 #include <drm/drm_crtc_helper.h> 32 #include <drm/drm_fb_helper.h> 33 #include <drm/drm_fourcc.h> 34 #include <drm/drm_probe_helper.h> 35 #include <drm/drm_vblank.h> 36 37 #include "nouveau_fbcon.h" 38 #include "nouveau_crtc.h" 39 #include "nouveau_gem.h" 40 #include "nouveau_connector.h" 41 #include "nv50_display.h" 42 43 #include <nvif/class.h> 44 #include <nvif/cl0046.h> 45 #include <nvif/event.h> 46 47 static int 48 nouveau_display_vblank_handler(struct nvif_notify *notify) 49 { 50 struct nouveau_crtc *nv_crtc = 51 container_of(notify, typeof(*nv_crtc), vblank); 52 drm_crtc_handle_vblank(&nv_crtc->base); 53 return NVIF_NOTIFY_KEEP; 54 } 55 56 int 57 nouveau_display_vblank_enable(struct drm_device *dev, unsigned int pipe) 58 { 59 struct drm_crtc *crtc; 60 struct nouveau_crtc *nv_crtc; 61 62 crtc = drm_crtc_from_index(dev, pipe); 63 if (!crtc) 64 return -EINVAL; 65 66 nv_crtc = nouveau_crtc(crtc); 67 nvif_notify_get(&nv_crtc->vblank); 68 69 return 0; 70 } 71 72 void 73 nouveau_display_vblank_disable(struct drm_device *dev, unsigned int pipe) 74 { 75 struct drm_crtc *crtc; 76 struct nouveau_crtc *nv_crtc; 77 78 crtc = drm_crtc_from_index(dev, pipe); 79 if (!crtc) 80 return; 81 82 nv_crtc = nouveau_crtc(crtc); 83 nvif_notify_put(&nv_crtc->vblank); 84 } 85 86 static inline int 87 calc(int blanks, int blanke, int total, int line) 88 { 89 if (blanke >= blanks) { 90 if (line >= blanks) 91 line -= total; 92 } else { 93 if (line >= blanks) 94 line -= total; 95 line -= blanke + 1; 96 } 97 return line; 98 } 99 100 static bool 101 nouveau_display_scanoutpos_head(struct drm_crtc *crtc, int *vpos, int *hpos, 102 ktime_t *stime, ktime_t *etime) 103 { 104 struct { 105 struct nv04_disp_mthd_v0 base; 106 struct nv04_disp_scanoutpos_v0 scan; 107 } args = { 108 .base.method = NV04_DISP_SCANOUTPOS, 109 .base.head = nouveau_crtc(crtc)->index, 110 }; 111 struct nouveau_display *disp = nouveau_display(crtc->dev); 112 struct drm_vblank_crtc *vblank = &crtc->dev->vblank[drm_crtc_index(crtc)]; 113 int retry = 20; 114 bool ret = false; 115 116 do { 117 ret = nvif_mthd(&disp->disp.object, 0, &args, sizeof(args)); 118 if (ret != 0) 119 return false; 120 121 if (args.scan.vline) { 122 ret = true; 123 break; 124 } 125 126 if (retry) ndelay(vblank->linedur_ns); 127 } while (retry--); 128 129 *hpos = args.scan.hline; 130 *vpos = calc(args.scan.vblanks, args.scan.vblanke, 131 args.scan.vtotal, args.scan.vline); 132 if (stime) *stime = ns_to_ktime(args.scan.time[0]); 133 if (etime) *etime = ns_to_ktime(args.scan.time[1]); 134 135 return ret; 136 } 137 138 bool 139 nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe, 140 bool in_vblank_irq, int *vpos, int *hpos, 141 ktime_t *stime, ktime_t *etime, 142 const struct drm_display_mode *mode) 143 { 144 struct drm_crtc *crtc; 145 146 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 147 if (nouveau_crtc(crtc)->index == pipe) { 148 return nouveau_display_scanoutpos_head(crtc, vpos, hpos, 149 stime, etime); 150 } 151 } 152 153 return false; 154 } 155 156 static void 157 nouveau_display_vblank_fini(struct drm_device *dev) 158 { 159 struct drm_crtc *crtc; 160 161 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 162 struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc); 163 nvif_notify_fini(&nv_crtc->vblank); 164 } 165 } 166 167 static int 168 nouveau_display_vblank_init(struct drm_device *dev) 169 { 170 struct nouveau_display *disp = nouveau_display(dev); 171 struct drm_crtc *crtc; 172 int ret; 173 174 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 175 struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc); 176 ret = nvif_notify_init(&disp->disp.object, 177 nouveau_display_vblank_handler, false, 178 NV04_DISP_NTFY_VBLANK, 179 &(struct nvif_notify_head_req_v0) { 180 .head = nv_crtc->index, 181 }, 182 sizeof(struct nvif_notify_head_req_v0), 183 sizeof(struct nvif_notify_head_rep_v0), 184 &nv_crtc->vblank); 185 if (ret) { 186 nouveau_display_vblank_fini(dev); 187 return ret; 188 } 189 } 190 191 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 192 if (ret) { 193 nouveau_display_vblank_fini(dev); 194 return ret; 195 } 196 197 return 0; 198 } 199 200 static void 201 nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb) 202 { 203 struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb); 204 205 if (fb->nvbo) 206 drm_gem_object_put_unlocked(&fb->nvbo->bo.base); 207 208 drm_framebuffer_cleanup(drm_fb); 209 kfree(fb); 210 } 211 212 static int 213 nouveau_user_framebuffer_create_handle(struct drm_framebuffer *drm_fb, 214 struct drm_file *file_priv, 215 unsigned int *handle) 216 { 217 struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb); 218 219 return drm_gem_handle_create(file_priv, &fb->nvbo->bo.base, handle); 220 } 221 222 static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = { 223 .destroy = nouveau_user_framebuffer_destroy, 224 .create_handle = nouveau_user_framebuffer_create_handle, 225 }; 226 227 int 228 nouveau_framebuffer_new(struct drm_device *dev, 229 const struct drm_mode_fb_cmd2 *mode_cmd, 230 struct nouveau_bo *nvbo, 231 struct nouveau_framebuffer **pfb) 232 { 233 struct nouveau_drm *drm = nouveau_drm(dev); 234 struct nouveau_framebuffer *fb; 235 int ret; 236 237 /* YUV overlays have special requirements pre-NV50 */ 238 if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA && 239 240 (mode_cmd->pixel_format == DRM_FORMAT_YUYV || 241 mode_cmd->pixel_format == DRM_FORMAT_UYVY || 242 mode_cmd->pixel_format == DRM_FORMAT_NV12 || 243 mode_cmd->pixel_format == DRM_FORMAT_NV21) && 244 (mode_cmd->pitches[0] & 0x3f || /* align 64 */ 245 mode_cmd->pitches[0] >= 0x10000 || /* at most 64k pitch */ 246 (mode_cmd->pitches[1] && /* pitches for planes must match */ 247 mode_cmd->pitches[0] != mode_cmd->pitches[1]))) { 248 struct drm_format_name_buf format_name; 249 DRM_DEBUG_KMS("Unsuitable framebuffer: format: %s; pitches: 0x%x\n 0x%x\n", 250 drm_get_format_name(mode_cmd->pixel_format, 251 &format_name), 252 mode_cmd->pitches[0], 253 mode_cmd->pitches[1]); 254 return -EINVAL; 255 } 256 257 if (!(fb = *pfb = kzalloc(sizeof(*fb), GFP_KERNEL))) 258 return -ENOMEM; 259 260 drm_helper_mode_fill_fb_struct(dev, &fb->base, mode_cmd); 261 fb->nvbo = nvbo; 262 263 ret = drm_framebuffer_init(dev, &fb->base, &nouveau_framebuffer_funcs); 264 if (ret) 265 kfree(fb); 266 return ret; 267 } 268 269 struct drm_framebuffer * 270 nouveau_user_framebuffer_create(struct drm_device *dev, 271 struct drm_file *file_priv, 272 const struct drm_mode_fb_cmd2 *mode_cmd) 273 { 274 struct nouveau_framebuffer *fb; 275 struct nouveau_bo *nvbo; 276 struct drm_gem_object *gem; 277 int ret; 278 279 gem = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]); 280 if (!gem) 281 return ERR_PTR(-ENOENT); 282 nvbo = nouveau_gem_object(gem); 283 284 ret = nouveau_framebuffer_new(dev, mode_cmd, nvbo, &fb); 285 if (ret == 0) 286 return &fb->base; 287 288 drm_gem_object_put_unlocked(gem); 289 return ERR_PTR(ret); 290 } 291 292 static const struct drm_mode_config_funcs nouveau_mode_config_funcs = { 293 .fb_create = nouveau_user_framebuffer_create, 294 .output_poll_changed = nouveau_fbcon_output_poll_changed, 295 }; 296 297 298 struct nouveau_drm_prop_enum_list { 299 u8 gen_mask; 300 int type; 301 char *name; 302 }; 303 304 static struct nouveau_drm_prop_enum_list underscan[] = { 305 { 6, UNDERSCAN_AUTO, "auto" }, 306 { 6, UNDERSCAN_OFF, "off" }, 307 { 6, UNDERSCAN_ON, "on" }, 308 {} 309 }; 310 311 static struct nouveau_drm_prop_enum_list dither_mode[] = { 312 { 7, DITHERING_MODE_AUTO, "auto" }, 313 { 7, DITHERING_MODE_OFF, "off" }, 314 { 1, DITHERING_MODE_ON, "on" }, 315 { 6, DITHERING_MODE_STATIC2X2, "static 2x2" }, 316 { 6, DITHERING_MODE_DYNAMIC2X2, "dynamic 2x2" }, 317 { 4, DITHERING_MODE_TEMPORAL, "temporal" }, 318 {} 319 }; 320 321 static struct nouveau_drm_prop_enum_list dither_depth[] = { 322 { 6, DITHERING_DEPTH_AUTO, "auto" }, 323 { 6, DITHERING_DEPTH_6BPC, "6 bpc" }, 324 { 6, DITHERING_DEPTH_8BPC, "8 bpc" }, 325 {} 326 }; 327 328 #define PROP_ENUM(p,gen,n,list) do { \ 329 struct nouveau_drm_prop_enum_list *l = (list); \ 330 int c = 0; \ 331 while (l->gen_mask) { \ 332 if (l->gen_mask & (1 << (gen))) \ 333 c++; \ 334 l++; \ 335 } \ 336 if (c) { \ 337 p = drm_property_create(dev, DRM_MODE_PROP_ENUM, n, c); \ 338 l = (list); \ 339 while (p && l->gen_mask) { \ 340 if (l->gen_mask & (1 << (gen))) { \ 341 drm_property_add_enum(p, l->type, l->name); \ 342 } \ 343 l++; \ 344 } \ 345 } \ 346 } while(0) 347 348 static void 349 nouveau_display_hpd_work(struct work_struct *work) 350 { 351 struct nouveau_drm *drm = container_of(work, typeof(*drm), hpd_work); 352 353 pm_runtime_get_sync(drm->dev->dev); 354 355 drm_helper_hpd_irq_event(drm->dev); 356 357 pm_runtime_mark_last_busy(drm->dev->dev); 358 pm_runtime_put_sync(drm->dev->dev); 359 } 360 361 #ifdef CONFIG_ACPI 362 363 static int 364 nouveau_display_acpi_ntfy(struct notifier_block *nb, unsigned long val, 365 void *data) 366 { 367 struct nouveau_drm *drm = container_of(nb, typeof(*drm), acpi_nb); 368 struct acpi_bus_event *info = data; 369 int ret; 370 371 if (!strcmp(info->device_class, ACPI_VIDEO_CLASS)) { 372 if (info->type == ACPI_VIDEO_NOTIFY_PROBE) { 373 ret = pm_runtime_get(drm->dev->dev); 374 if (ret == 1 || ret == -EACCES) { 375 /* If the GPU is already awake, or in a state 376 * where we can't wake it up, it can handle 377 * it's own hotplug events. 378 */ 379 pm_runtime_put_autosuspend(drm->dev->dev); 380 } else if (ret == 0) { 381 /* This may be the only indication we receive 382 * of a connector hotplug on a runtime 383 * suspended GPU, schedule hpd_work to check. 384 */ 385 NV_DEBUG(drm, "ACPI requested connector reprobe\n"); 386 schedule_work(&drm->hpd_work); 387 pm_runtime_put_noidle(drm->dev->dev); 388 } else { 389 NV_WARN(drm, "Dropped ACPI reprobe event due to RPM error: %d\n", 390 ret); 391 } 392 393 /* acpi-video should not generate keypresses for this */ 394 return NOTIFY_BAD; 395 } 396 } 397 398 return NOTIFY_DONE; 399 } 400 #endif 401 402 int 403 nouveau_display_init(struct drm_device *dev, bool resume, bool runtime) 404 { 405 struct nouveau_display *disp = nouveau_display(dev); 406 struct drm_connector *connector; 407 struct drm_connector_list_iter conn_iter; 408 int ret; 409 410 ret = disp->init(dev, resume, runtime); 411 if (ret) 412 return ret; 413 414 /* enable connector detection and polling for connectors without HPD 415 * support 416 */ 417 drm_kms_helper_poll_enable(dev); 418 419 /* enable hotplug interrupts */ 420 drm_connector_list_iter_begin(dev, &conn_iter); 421 nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) { 422 struct nouveau_connector *conn = nouveau_connector(connector); 423 nvif_notify_get(&conn->hpd); 424 } 425 drm_connector_list_iter_end(&conn_iter); 426 427 return ret; 428 } 429 430 void 431 nouveau_display_fini(struct drm_device *dev, bool suspend, bool runtime) 432 { 433 struct nouveau_display *disp = nouveau_display(dev); 434 struct nouveau_drm *drm = nouveau_drm(dev); 435 struct drm_connector *connector; 436 struct drm_connector_list_iter conn_iter; 437 438 if (!suspend) { 439 if (drm_drv_uses_atomic_modeset(dev)) 440 drm_atomic_helper_shutdown(dev); 441 else 442 drm_helper_force_disable_all(dev); 443 } 444 445 /* disable hotplug interrupts */ 446 drm_connector_list_iter_begin(dev, &conn_iter); 447 nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) { 448 struct nouveau_connector *conn = nouveau_connector(connector); 449 nvif_notify_put(&conn->hpd); 450 } 451 drm_connector_list_iter_end(&conn_iter); 452 453 if (!runtime) 454 cancel_work_sync(&drm->hpd_work); 455 456 drm_kms_helper_poll_disable(dev); 457 disp->fini(dev, suspend); 458 } 459 460 static void 461 nouveau_display_create_properties(struct drm_device *dev) 462 { 463 struct nouveau_display *disp = nouveau_display(dev); 464 int gen; 465 466 if (disp->disp.object.oclass < NV50_DISP) 467 gen = 0; 468 else 469 if (disp->disp.object.oclass < GF110_DISP) 470 gen = 1; 471 else 472 gen = 2; 473 474 PROP_ENUM(disp->dithering_mode, gen, "dithering mode", dither_mode); 475 PROP_ENUM(disp->dithering_depth, gen, "dithering depth", dither_depth); 476 PROP_ENUM(disp->underscan_property, gen, "underscan", underscan); 477 478 disp->underscan_hborder_property = 479 drm_property_create_range(dev, 0, "underscan hborder", 0, 128); 480 481 disp->underscan_vborder_property = 482 drm_property_create_range(dev, 0, "underscan vborder", 0, 128); 483 484 if (gen < 1) 485 return; 486 487 /* -90..+90 */ 488 disp->vibrant_hue_property = 489 drm_property_create_range(dev, 0, "vibrant hue", 0, 180); 490 491 /* -100..+100 */ 492 disp->color_vibrance_property = 493 drm_property_create_range(dev, 0, "color vibrance", 0, 200); 494 } 495 496 int 497 nouveau_display_create(struct drm_device *dev) 498 { 499 struct nouveau_drm *drm = nouveau_drm(dev); 500 struct nvkm_device *device = nvxx_device(&drm->client.device); 501 struct nouveau_display *disp; 502 int ret; 503 504 disp = drm->display = kzalloc(sizeof(*disp), GFP_KERNEL); 505 if (!disp) 506 return -ENOMEM; 507 508 drm_mode_config_init(dev); 509 drm_mode_create_scaling_mode_property(dev); 510 drm_mode_create_dvi_i_properties(dev); 511 512 dev->mode_config.funcs = &nouveau_mode_config_funcs; 513 dev->mode_config.fb_base = device->func->resource_addr(device, 1); 514 515 dev->mode_config.min_width = 0; 516 dev->mode_config.min_height = 0; 517 if (drm->client.device.info.family < NV_DEVICE_INFO_V0_CELSIUS) { 518 dev->mode_config.max_width = 2048; 519 dev->mode_config.max_height = 2048; 520 } else 521 if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) { 522 dev->mode_config.max_width = 4096; 523 dev->mode_config.max_height = 4096; 524 } else 525 if (drm->client.device.info.family < NV_DEVICE_INFO_V0_FERMI) { 526 dev->mode_config.max_width = 8192; 527 dev->mode_config.max_height = 8192; 528 } else { 529 dev->mode_config.max_width = 16384; 530 dev->mode_config.max_height = 16384; 531 } 532 533 dev->mode_config.preferred_depth = 24; 534 dev->mode_config.prefer_shadow = 1; 535 536 if (drm->client.device.info.chipset < 0x11) 537 dev->mode_config.async_page_flip = false; 538 else 539 dev->mode_config.async_page_flip = true; 540 541 drm_kms_helper_poll_init(dev); 542 drm_kms_helper_poll_disable(dev); 543 544 if (nouveau_modeset != 2 && drm->vbios.dcb.entries) { 545 ret = nvif_disp_ctor(&drm->client.device, 0, &disp->disp); 546 if (ret == 0) { 547 nouveau_display_create_properties(dev); 548 if (disp->disp.object.oclass < NV50_DISP) 549 ret = nv04_display_create(dev); 550 else 551 ret = nv50_display_create(dev); 552 } 553 } else { 554 ret = 0; 555 } 556 557 if (ret) 558 goto disp_create_err; 559 560 drm_mode_config_reset(dev); 561 562 if (dev->mode_config.num_crtc) { 563 ret = nouveau_display_vblank_init(dev); 564 if (ret) 565 goto vblank_err; 566 } 567 568 INIT_WORK(&drm->hpd_work, nouveau_display_hpd_work); 569 #ifdef CONFIG_ACPI 570 drm->acpi_nb.notifier_call = nouveau_display_acpi_ntfy; 571 register_acpi_notifier(&drm->acpi_nb); 572 #endif 573 574 return 0; 575 576 vblank_err: 577 disp->dtor(dev); 578 disp_create_err: 579 drm_kms_helper_poll_fini(dev); 580 drm_mode_config_cleanup(dev); 581 return ret; 582 } 583 584 void 585 nouveau_display_destroy(struct drm_device *dev) 586 { 587 struct nouveau_display *disp = nouveau_display(dev); 588 589 #ifdef CONFIG_ACPI 590 unregister_acpi_notifier(&nouveau_drm(dev)->acpi_nb); 591 #endif 592 nouveau_display_vblank_fini(dev); 593 594 drm_kms_helper_poll_fini(dev); 595 drm_mode_config_cleanup(dev); 596 597 if (disp->dtor) 598 disp->dtor(dev); 599 600 nvif_disp_dtor(&disp->disp); 601 602 nouveau_drm(dev)->display = NULL; 603 kfree(disp); 604 } 605 606 int 607 nouveau_display_suspend(struct drm_device *dev, bool runtime) 608 { 609 struct nouveau_display *disp = nouveau_display(dev); 610 611 if (drm_drv_uses_atomic_modeset(dev)) { 612 if (!runtime) { 613 disp->suspend = drm_atomic_helper_suspend(dev); 614 if (IS_ERR(disp->suspend)) { 615 int ret = PTR_ERR(disp->suspend); 616 disp->suspend = NULL; 617 return ret; 618 } 619 } 620 } 621 622 nouveau_display_fini(dev, true, runtime); 623 return 0; 624 } 625 626 void 627 nouveau_display_resume(struct drm_device *dev, bool runtime) 628 { 629 struct nouveau_display *disp = nouveau_display(dev); 630 631 nouveau_display_init(dev, true, runtime); 632 633 if (drm_drv_uses_atomic_modeset(dev)) { 634 if (disp->suspend) { 635 drm_atomic_helper_resume(dev, disp->suspend); 636 disp->suspend = NULL; 637 } 638 return; 639 } 640 } 641 642 int 643 nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev, 644 struct drm_mode_create_dumb *args) 645 { 646 struct nouveau_cli *cli = nouveau_cli(file_priv); 647 struct nouveau_bo *bo; 648 uint32_t domain; 649 int ret; 650 651 args->pitch = roundup(args->width * (args->bpp / 8), 256); 652 args->size = args->pitch * args->height; 653 args->size = roundup(args->size, PAGE_SIZE); 654 655 /* Use VRAM if there is any ; otherwise fallback to system memory */ 656 if (nouveau_drm(dev)->client.device.info.ram_size != 0) 657 domain = NOUVEAU_GEM_DOMAIN_VRAM; 658 else 659 domain = NOUVEAU_GEM_DOMAIN_GART; 660 661 ret = nouveau_gem_new(cli, args->size, 0, domain, 0, 0, &bo); 662 if (ret) 663 return ret; 664 665 ret = drm_gem_handle_create(file_priv, &bo->bo.base, &args->handle); 666 drm_gem_object_put_unlocked(&bo->bo.base); 667 return ret; 668 } 669 670 int 671 nouveau_display_dumb_map_offset(struct drm_file *file_priv, 672 struct drm_device *dev, 673 uint32_t handle, uint64_t *poffset) 674 { 675 struct drm_gem_object *gem; 676 677 gem = drm_gem_object_lookup(file_priv, handle); 678 if (gem) { 679 struct nouveau_bo *bo = nouveau_gem_object(gem); 680 *poffset = drm_vma_node_offset_addr(&bo->bo.base.vma_node); 681 drm_gem_object_put_unlocked(gem); 682 return 0; 683 } 684 685 return -ENOENT; 686 } 687