ld_sdmmc.c revision 1.44
1 /* $NetBSD: ld_sdmmc.c,v 1.44 2024/10/18 11:03:52 jmcneill Exp $ */ 2 3 /* 4 * Copyright (c) 2008 KIYOHARA Takashi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: ld_sdmmc.c,v 1.44 2024/10/18 11:03:52 jmcneill Exp $"); 32 33 #ifdef _KERNEL_OPT 34 #include "opt_sdmmc.h" 35 #endif 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 40 #include <sys/buf.h> 41 #include <sys/bufq.h> 42 #include <sys/bus.h> 43 #include <sys/device.h> 44 #include <sys/disk.h> 45 #include <sys/disklabel.h> 46 #include <sys/dkio.h> 47 #include <sys/endian.h> 48 #include <sys/kernel.h> 49 #include <sys/kmem.h> 50 #include <sys/kthread.h> 51 #include <sys/module.h> 52 #include <sys/syslog.h> 53 #include <sys/systm.h> 54 55 #include <dev/ldvar.h> 56 57 #include <dev/sdmmc/sdmmcvar.h> 58 59 #include "ioconf.h" 60 61 #ifdef LD_SDMMC_DEBUG 62 #define DPRINTF(s) printf s 63 #else 64 #define DPRINTF(s) __nothing 65 #endif 66 67 #define LD_SDMMC_IORETRIES 5 /* number of retries before giving up */ 68 #define RECOVERYTIME hz/2 /* time to wait before retrying a cmd */ 69 70 #define LD_SDMMC_MAXQUEUECNT 4 /* number of queued bio requests */ 71 #define LD_SDMMC_MAXTASKCNT 8 /* number of tasks in task pool */ 72 73 struct ld_sdmmc_softc; 74 75 struct ld_sdmmc_task { 76 struct sdmmc_task task; 77 struct ld_sdmmc_softc *task_sc; 78 79 struct buf *task_bp; 80 int task_retries; /* number of xfer retry */ 81 struct callout task_restart_ch; 82 83 bool task_poll; 84 int *task_errorp; 85 86 TAILQ_ENTRY(ld_sdmmc_task) task_entry; 87 }; 88 89 struct ld_sdmmc_softc { 90 struct ld_softc sc_ld; 91 int sc_hwunit; 92 char *sc_typename; 93 struct sdmmc_function *sc_sf; 94 95 kmutex_t sc_lock; 96 kcondvar_t sc_cv; 97 TAILQ_HEAD(, ld_sdmmc_task) sc_freeq; 98 TAILQ_HEAD(, ld_sdmmc_task) sc_xferq; 99 unsigned sc_busy; 100 bool sc_dying; 101 102 struct evcnt sc_ev_discard; /* discard counter */ 103 struct evcnt sc_ev_discarderr; /* discard error counter */ 104 struct evcnt sc_ev_discardbusy; /* discard busy counter */ 105 struct evcnt sc_ev_cachesyncbusy; /* cache sync busy counter */ 106 107 struct ld_sdmmc_task sc_task[LD_SDMMC_MAXTASKCNT]; 108 }; 109 110 static int ld_sdmmc_match(device_t, cfdata_t, void *); 111 static void ld_sdmmc_attach(device_t, device_t, void *); 112 static int ld_sdmmc_detach(device_t, int); 113 114 static int ld_sdmmc_dump(struct ld_softc *, void *, int, int); 115 static int ld_sdmmc_start(struct ld_softc *, struct buf *); 116 static void ld_sdmmc_restart(void *); 117 static int ld_sdmmc_discard(struct ld_softc *, struct buf *); 118 static int ld_sdmmc_ioctl(struct ld_softc *, u_long, void *, int32_t, bool); 119 120 static void ld_sdmmc_doattach(void *); 121 static void ld_sdmmc_dobio(void *); 122 static void ld_sdmmc_dodiscard(void *); 123 124 CFATTACH_DECL_NEW(ld_sdmmc, sizeof(struct ld_sdmmc_softc), 125 ld_sdmmc_match, ld_sdmmc_attach, ld_sdmmc_detach, NULL); 126 127 static struct ld_sdmmc_task * 128 ld_sdmmc_task_get(struct ld_sdmmc_softc *sc) 129 { 130 struct ld_sdmmc_task *task; 131 132 KASSERT(mutex_owned(&sc->sc_lock)); 133 134 if (sc->sc_dying || (task = TAILQ_FIRST(&sc->sc_freeq)) == NULL) 135 return NULL; 136 TAILQ_REMOVE(&sc->sc_freeq, task, task_entry); 137 TAILQ_INSERT_TAIL(&sc->sc_xferq, task, task_entry); 138 KASSERT(task->task_bp == NULL); 139 KASSERT(task->task_errorp == NULL); 140 141 return task; 142 } 143 144 static void 145 ld_sdmmc_task_put(struct ld_sdmmc_softc *sc, struct ld_sdmmc_task *task) 146 { 147 148 KASSERT(mutex_owned(&sc->sc_lock)); 149 150 TAILQ_REMOVE(&sc->sc_xferq, task, task_entry); 151 TAILQ_INSERT_TAIL(&sc->sc_freeq, task, task_entry); 152 task->task_bp = NULL; 153 task->task_errorp = NULL; 154 } 155 156 static void 157 ld_sdmmc_task_cancel(struct ld_sdmmc_softc *sc, struct ld_sdmmc_task *task) 158 { 159 struct buf *bp; 160 int *errorp; 161 162 KASSERT(mutex_owned(&sc->sc_lock)); 163 KASSERT(sc->sc_dying); 164 165 /* 166 * Either the callout or the task may be pending, but not both. 167 * First, determine whether the callout is pending. 168 */ 169 if (callout_pending(&task->task_restart_ch) || 170 callout_invoking(&task->task_restart_ch)) { 171 /* 172 * The callout either is pending, or just started but 173 * is waiting for us to release the lock. At this 174 * point, it will notice sc->sc_dying and give up, so 175 * just wait for it to complete and then we will 176 * release everything. 177 */ 178 callout_halt(&task->task_restart_ch, &sc->sc_lock); 179 } else { 180 /* 181 * If the callout is running, it has just scheduled, so 182 * after we wait for the callout to finish running, the 183 * task is either pending or running. If the task is 184 * already running, it will notice sc->sc_dying and 185 * give up; otherwise we have to release everything. 186 */ 187 callout_halt(&task->task_restart_ch, &sc->sc_lock); 188 if (!sdmmc_del_task(sc->sc_sf->sc, &task->task, &sc->sc_lock)) 189 return; /* task already started, let it clean up */ 190 } 191 192 /* 193 * It is our responsibility to clean up. Move it from xferq 194 * back to freeq and make sure to notify anyone waiting that 195 * it's finished. 196 */ 197 bp = task->task_bp; 198 errorp = task->task_errorp; 199 ld_sdmmc_task_put(sc, task); 200 201 /* 202 * If the task was for an asynchronous I/O xfer, fail the I/O 203 * xfer, with the softc lock dropped since this is a callback 204 * into arbitrary other subsystems. 205 */ 206 if (bp) { 207 mutex_exit(&sc->sc_lock); 208 /* 209 * XXX We assume that the same sequence works for bio 210 * and discard -- that lddiscardend is just the same as 211 * setting bp->b_resid = bp->b_bcount in the event of 212 * error and then calling lddone. 213 */ 214 bp->b_error = ENXIO; 215 bp->b_resid = bp->b_bcount; 216 lddone(&sc->sc_ld, bp); 217 mutex_enter(&sc->sc_lock); 218 } 219 220 /* 221 * If the task was for a synchronous operation (cachesync), 222 * then just set the error indicator and wake up the waiter. 223 */ 224 if (errorp) { 225 *errorp = ENXIO; 226 cv_broadcast(&sc->sc_cv); 227 } 228 } 229 230 /* ARGSUSED */ 231 static int 232 ld_sdmmc_match(device_t parent, cfdata_t match, void *aux) 233 { 234 struct sdmmc_softc *sdmsc = device_private(parent); 235 236 if (ISSET(sdmsc->sc_flags, SMF_MEM_MODE)) 237 return 1; 238 return 0; 239 } 240 241 /* ARGSUSED */ 242 static void 243 ld_sdmmc_attach(device_t parent, device_t self, void *aux) 244 { 245 struct ld_sdmmc_softc *sc = device_private(self); 246 struct sdmmc_attach_args *sa = aux; 247 struct ld_softc *ld = &sc->sc_ld; 248 struct ld_sdmmc_task *task; 249 struct lwp *lwp; 250 const char *cardtype; 251 int i; 252 253 ld->sc_dv = self; 254 255 aprint_normal(": <0x%02x:0x%04x:%s:0x%02x:0x%08x:0x%03x>\n", 256 sa->sf->cid.mid, sa->sf->cid.oid, sa->sf->cid.pnm, 257 sa->sf->cid.rev, sa->sf->cid.psn, sa->sf->cid.mdt); 258 aprint_naive("\n"); 259 260 if (ISSET(sa->sf->sc->sc_flags, SMF_SD_MODE)) { 261 cardtype = "SD card"; 262 } else { 263 cardtype = "MMC"; 264 } 265 sc->sc_typename = kmem_asprintf("%s 0x%02x:0x%04x:%s", 266 cardtype, sa->sf->cid.mid, sa->sf->cid.oid, sa->sf->cid.pnm); 267 268 evcnt_attach_dynamic(&sc->sc_ev_discard, EVCNT_TYPE_MISC, 269 NULL, device_xname(self), "sdmmc discard count"); 270 evcnt_attach_dynamic(&sc->sc_ev_discarderr, EVCNT_TYPE_MISC, 271 NULL, device_xname(self), "sdmmc discard errors"); 272 evcnt_attach_dynamic(&sc->sc_ev_discardbusy, EVCNT_TYPE_MISC, 273 NULL, device_xname(self), "sdmmc discard busy"); 274 275 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SDMMC); 276 cv_init(&sc->sc_cv, "ldsdmmc"); 277 TAILQ_INIT(&sc->sc_freeq); 278 TAILQ_INIT(&sc->sc_xferq); 279 sc->sc_dying = false; 280 281 const int ntask = __arraycount(sc->sc_task); 282 for (i = 0; i < ntask; i++) { 283 task = &sc->sc_task[i]; 284 task->task_sc = sc; 285 callout_init(&task->task_restart_ch, CALLOUT_MPSAFE); 286 TAILQ_INSERT_TAIL(&sc->sc_freeq, task, task_entry); 287 } 288 289 sc->sc_hwunit = 0; /* always 0? */ 290 sc->sc_sf = sa->sf; 291 292 ld->sc_flags = LDF_ENABLED | LDF_MPSAFE; 293 ld->sc_secperunit = sc->sc_sf->csd.capacity; 294 ld->sc_secsize = SDMMC_SECTOR_SIZE; 295 ld->sc_maxxfer = MAXPHYS; 296 ld->sc_maxqueuecnt = LD_SDMMC_MAXQUEUECNT; 297 ld->sc_dump = ld_sdmmc_dump; 298 ld->sc_start = ld_sdmmc_start; 299 ld->sc_discard = ld_sdmmc_discard; 300 ld->sc_ioctl = ld_sdmmc_ioctl; 301 ld->sc_typename = sc->sc_typename; 302 303 /* 304 * Defer attachment of ld + disk subsystem to a thread. 305 * 306 * This is necessary because wedge autodiscover needs to 307 * open and call into the ld driver, which could deadlock 308 * when the sdmmc driver isn't ready in early bootstrap. 309 * 310 * Don't mark thread as MPSAFE to keep aprint output sane. 311 */ 312 config_pending_incr(self); 313 if (kthread_create(PRI_NONE, 0, NULL, 314 ld_sdmmc_doattach, sc, &lwp, "%sattach", device_xname(self))) { 315 aprint_error_dev(self, "couldn't create thread\n"); 316 } 317 } 318 319 static void 320 ld_sdmmc_doattach(void *arg) 321 { 322 struct ld_sdmmc_softc *sc = (struct ld_sdmmc_softc *)arg; 323 struct ld_softc *ld = &sc->sc_ld; 324 struct sdmmc_softc *ssc = device_private(device_parent(ld->sc_dv)); 325 const u_int emmc_cache_size = sc->sc_sf->ext_csd.cache_size; 326 const bool sd_cache = sc->sc_sf->ssr.cache; 327 char buf[sizeof("9999 KB")]; 328 329 ldattach(ld, BUFQ_DISK_DEFAULT_STRAT); 330 aprint_normal_dev(ld->sc_dv, "%d-bit width,", sc->sc_sf->width); 331 if (ssc->sc_transfer_mode != NULL) 332 aprint_normal(" %s,", ssc->sc_transfer_mode); 333 if (emmc_cache_size > 0) { 334 format_bytes(buf, sizeof(buf), emmc_cache_size); 335 aprint_normal(" %s cache%s,", buf, 336 ISSET(sc->sc_sf->flags, SFF_CACHE_ENABLED) ? "" : 337 " (disabled)"); 338 } else if (sd_cache) { 339 aprint_normal(" Cache%s,", 340 ISSET(sc->sc_sf->flags, SFF_CACHE_ENABLED) ? "" : 341 " (disabled)"); 342 } 343 if ((ssc->sc_busclk / 1000) != 0) 344 aprint_normal(" %u.%03u MHz\n", 345 ssc->sc_busclk / 1000, ssc->sc_busclk % 1000); 346 else 347 aprint_normal(" %u KHz\n", ssc->sc_busclk % 1000); 348 config_pending_decr(ld->sc_dv); 349 kthread_exit(0); 350 } 351 352 static int 353 ld_sdmmc_detach(device_t dev, int flags) 354 { 355 struct ld_sdmmc_softc *sc = device_private(dev); 356 struct ld_softc *ld = &sc->sc_ld; 357 struct ld_sdmmc_task *task; 358 int error, i; 359 360 /* 361 * Block new xfers, or fail if the disk is still open and the 362 * detach isn't forced. After this point, we are committed to 363 * detaching. 364 */ 365 error = ldbegindetach(ld, flags); 366 if (error) 367 return error; 368 369 /* 370 * Abort all pending tasks, and wait for all pending waiters to 371 * notice that we're gone. 372 */ 373 mutex_enter(&sc->sc_lock); 374 sc->sc_dying = true; 375 while ((task = TAILQ_FIRST(&sc->sc_xferq)) != NULL) 376 ld_sdmmc_task_cancel(sc, task); 377 while (sc->sc_busy) 378 cv_wait(&sc->sc_cv, &sc->sc_lock); 379 mutex_exit(&sc->sc_lock); 380 381 /* Done! Destroy the disk. */ 382 ldenddetach(ld); 383 384 KASSERT(TAILQ_EMPTY(&sc->sc_xferq)); 385 386 for (i = 0; i < __arraycount(sc->sc_task); i++) 387 callout_destroy(&sc->sc_task[i].task_restart_ch); 388 389 cv_destroy(&sc->sc_cv); 390 mutex_destroy(&sc->sc_lock); 391 392 evcnt_detach(&sc->sc_ev_discard); 393 evcnt_detach(&sc->sc_ev_discarderr); 394 evcnt_detach(&sc->sc_ev_discardbusy); 395 kmem_free(sc->sc_typename, strlen(sc->sc_typename) + 1); 396 397 return 0; 398 } 399 400 static int 401 ld_sdmmc_start(struct ld_softc *ld, struct buf *bp) 402 { 403 struct ld_sdmmc_softc *sc = device_private(ld->sc_dv); 404 struct ld_sdmmc_task *task; 405 int error; 406 407 mutex_enter(&sc->sc_lock); 408 if ((task = ld_sdmmc_task_get(sc)) == NULL) { 409 error = EAGAIN; 410 goto out; 411 } 412 413 task->task_bp = bp; 414 task->task_retries = 0; 415 sdmmc_init_task(&task->task, ld_sdmmc_dobio, task); 416 417 sdmmc_add_task(sc->sc_sf->sc, &task->task); 418 419 /* Success! The xfer is now queued. */ 420 error = 0; 421 422 out: mutex_exit(&sc->sc_lock); 423 return error; 424 } 425 426 static void 427 ld_sdmmc_restart(void *arg) 428 { 429 struct ld_sdmmc_task *task = (struct ld_sdmmc_task *)arg; 430 struct ld_sdmmc_softc *sc = task->task_sc; 431 struct buf *bp = task->task_bp; 432 433 bp->b_resid = bp->b_bcount; 434 435 mutex_enter(&sc->sc_lock); 436 callout_ack(&task->task_restart_ch); 437 if (!sc->sc_dying) 438 sdmmc_add_task(sc->sc_sf->sc, &task->task); 439 mutex_exit(&sc->sc_lock); 440 } 441 442 static void 443 ld_sdmmc_dobio(void *arg) 444 { 445 struct ld_sdmmc_task *task = (struct ld_sdmmc_task *)arg; 446 struct ld_sdmmc_softc *sc = task->task_sc; 447 struct buf *bp = task->task_bp; 448 int error; 449 450 /* 451 * I/O operation 452 */ 453 DPRINTF(("%s: I/O operation (dir=%s, blkno=0x%jx, bcnt=0x%x)\n", 454 device_xname(sc->sc_ld.sc_dv), bp->b_flags & B_READ ? "IN" : "OUT", 455 bp->b_rawblkno, bp->b_bcount)); 456 457 /* is everything done in terms of blocks? */ 458 if (bp->b_rawblkno >= sc->sc_sf->csd.capacity) { 459 /* trying to read or write past end of device */ 460 aprint_error_dev(sc->sc_ld.sc_dv, 461 "blkno 0x%" PRIu64 " exceeds capacity %d\n", 462 bp->b_rawblkno, sc->sc_sf->csd.capacity); 463 bp->b_error = EINVAL; 464 bp->b_resid = bp->b_bcount; 465 466 goto done; 467 } 468 469 if (bp->b_flags & B_READ) 470 error = sdmmc_mem_read_block(sc->sc_sf, bp->b_rawblkno, 471 bp->b_data, bp->b_bcount); 472 else 473 error = sdmmc_mem_write_block(sc->sc_sf, bp->b_rawblkno, 474 bp->b_data, bp->b_bcount); 475 if (error) { 476 if (task->task_retries < LD_SDMMC_IORETRIES) { 477 struct dk_softc *dksc = &sc->sc_ld.sc_dksc; 478 struct cfdriver *cd = device_cfdriver(dksc->sc_dev); 479 480 diskerr(bp, cd->cd_name, "error", LOG_PRINTF, 0, 481 dksc->sc_dkdev.dk_label); 482 printf(", retrying\n"); 483 task->task_retries++; 484 mutex_enter(&sc->sc_lock); 485 if (sc->sc_dying) { 486 bp->b_resid = bp->b_bcount; 487 bp->b_error = error; 488 goto done_locked; 489 } else { 490 callout_reset(&task->task_restart_ch, 491 RECOVERYTIME, ld_sdmmc_restart, task); 492 } 493 mutex_exit(&sc->sc_lock); 494 return; 495 } 496 bp->b_error = error; 497 bp->b_resid = bp->b_bcount; 498 } else { 499 bp->b_resid = 0; 500 } 501 502 done: 503 /* Dissociate the task from the I/O xfer and release it. */ 504 mutex_enter(&sc->sc_lock); 505 done_locked: 506 ld_sdmmc_task_put(sc, task); 507 mutex_exit(&sc->sc_lock); 508 509 lddone(&sc->sc_ld, bp); 510 } 511 512 static int 513 ld_sdmmc_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt) 514 { 515 struct ld_sdmmc_softc *sc = device_private(ld->sc_dv); 516 517 return sdmmc_mem_write_block(sc->sc_sf, blkno, data, 518 blkcnt * ld->sc_secsize); 519 } 520 521 static void 522 ld_sdmmc_dodiscard(void *arg) 523 { 524 struct ld_sdmmc_task *task = arg; 525 struct ld_sdmmc_softc *sc = task->task_sc; 526 struct buf *bp = task->task_bp; 527 uint32_t sblkno, nblks; 528 int error; 529 530 /* first and last block to erase */ 531 sblkno = bp->b_rawblkno; 532 nblks = howmany(bp->b_bcount, sc->sc_ld.sc_secsize); 533 534 /* An error from discard is non-fatal */ 535 error = sdmmc_mem_discard(sc->sc_sf, sblkno, sblkno + nblks - 1); 536 537 /* Count error or success and release the task. */ 538 mutex_enter(&sc->sc_lock); 539 if (error) 540 sc->sc_ev_discarderr.ev_count++; 541 else 542 sc->sc_ev_discard.ev_count++; 543 ld_sdmmc_task_put(sc, task); 544 mutex_exit(&sc->sc_lock); 545 546 /* Record the error and notify the xfer of completion. */ 547 if (error) 548 bp->b_error = error; 549 lddiscardend(&sc->sc_ld, bp); 550 } 551 552 static int 553 ld_sdmmc_discard(struct ld_softc *ld, struct buf *bp) 554 { 555 struct ld_sdmmc_softc *sc = device_private(ld->sc_dv); 556 struct ld_sdmmc_task *task; 557 int error; 558 559 mutex_enter(&sc->sc_lock); 560 561 /* Acquire a free task, or drop the request altogether. */ 562 if ((task = ld_sdmmc_task_get(sc)) == NULL) { 563 sc->sc_ev_discardbusy.ev_count++; 564 error = EBUSY; 565 goto out; 566 } 567 568 /* Set up the task and schedule it. */ 569 task->task_bp = bp; 570 sdmmc_init_task(&task->task, ld_sdmmc_dodiscard, task); 571 572 sdmmc_add_task(sc->sc_sf->sc, &task->task); 573 574 /* Success! The request is queued. */ 575 error = 0; 576 577 out: mutex_exit(&sc->sc_lock); 578 return error; 579 } 580 581 static void 582 ld_sdmmc_docachesync(void *arg) 583 { 584 struct ld_sdmmc_task *task = arg; 585 struct ld_sdmmc_softc *sc = task->task_sc; 586 int error; 587 588 /* Flush the cache. */ 589 error = sdmmc_mem_flush_cache(sc->sc_sf, task->task_poll); 590 591 mutex_enter(&sc->sc_lock); 592 593 /* Notify the other thread that we're done; pass on the error. */ 594 *task->task_errorp = error; 595 cv_broadcast(&sc->sc_cv); 596 597 /* Release the task. */ 598 ld_sdmmc_task_put(sc, task); 599 600 mutex_exit(&sc->sc_lock); 601 } 602 603 static int 604 ld_sdmmc_cachesync(struct ld_softc *ld, bool poll) 605 { 606 struct ld_sdmmc_softc *sc = device_private(ld->sc_dv); 607 struct sdmmc_softc *sdmmc = device_private(device_parent(ld->sc_dv)); 608 struct ld_sdmmc_task *task; 609 int error = -1; 610 611 /* 612 * If we come here through the sdmmc discovery task, we can't 613 * wait for a new task because the new task can't even begin 614 * until the sdmmc discovery task has completed. 615 * 616 * XXX This is wrong, because there may already be queued I/O 617 * tasks ahead of us. Fixing this properly requires doing 618 * discovery in a separate thread. But this should avoid the 619 * deadlock of PR kern/57870 (https://gnats.NetBSD.org/57870) 620 * until we do split that up. 621 */ 622 if (curlwp == sdmmc->sc_tskq_lwp) 623 return sdmmc_mem_flush_cache(sc->sc_sf, poll); 624 625 mutex_enter(&sc->sc_lock); 626 627 /* Acquire a free task, or fail with EBUSY. */ 628 if ((task = ld_sdmmc_task_get(sc)) == NULL) { 629 sc->sc_ev_cachesyncbusy.ev_count++; 630 error = EBUSY; 631 goto out; 632 } 633 634 /* Set up the task and schedule it. */ 635 task->task_poll = poll; 636 task->task_errorp = &error; 637 sdmmc_init_task(&task->task, ld_sdmmc_docachesync, task); 638 639 sdmmc_add_task(sc->sc_sf->sc, &task->task); 640 641 /* 642 * Wait for the task to complete. If the device is yanked, 643 * detach will notify us. Keep the busy count up until we're 644 * done waiting so that the softc doesn't go away until we're 645 * done. 646 */ 647 sc->sc_busy++; 648 KASSERT(sc->sc_busy <= LD_SDMMC_MAXTASKCNT); 649 while (error == -1) 650 cv_wait(&sc->sc_cv, &sc->sc_lock); 651 if (--sc->sc_busy == 0) 652 cv_broadcast(&sc->sc_cv); 653 654 out: mutex_exit(&sc->sc_lock); 655 return error; 656 } 657 658 static int 659 ld_sdmmc_ioctl(struct ld_softc *ld, u_long cmd, void *addr, int32_t flag, 660 bool poll) 661 { 662 663 switch (cmd) { 664 case DIOCCACHESYNC: 665 return ld_sdmmc_cachesync(ld, poll); 666 default: 667 return EPASSTHROUGH; 668 } 669 } 670 671 MODULE(MODULE_CLASS_DRIVER, ld_sdmmc, "ld"); 672 673 #ifdef _MODULE 674 /* 675 * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd" 676 * XXX it will be defined in the common-code module 677 */ 678 #undef CFDRIVER_DECL 679 #define CFDRIVER_DECL(name, class, attr) 680 #include "ioconf.c" 681 #endif 682 683 static int 684 ld_sdmmc_modcmd(modcmd_t cmd, void *opaque) 685 { 686 #ifdef _MODULE 687 /* 688 * We ignore the cfdriver_vec[] that ioconf provides, since 689 * the cfdrivers are attached already. 690 */ 691 static struct cfdriver * const no_cfdriver_vec[] = { NULL }; 692 #endif 693 int error = 0; 694 695 #ifdef _MODULE 696 switch (cmd) { 697 case MODULE_CMD_INIT: 698 error = config_init_component(no_cfdriver_vec, 699 cfattach_ioconf_ld_sdmmc, cfdata_ioconf_ld_sdmmc); 700 break; 701 case MODULE_CMD_FINI: 702 error = config_fini_component(no_cfdriver_vec, 703 cfattach_ioconf_ld_sdmmc, cfdata_ioconf_ld_sdmmc); 704 break; 705 default: 706 error = ENOTTY; 707 break; 708 } 709 #endif 710 711 return error; 712 } 713
Indexes created Sat Oct 18 16:10:06 GMT 2025