FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_bus.c
1 /*-
2 * Copyright (c) 1997,1998,2003 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include "opt_bus.h"
31
32 #include <sys/param.h>
33 #include <sys/conf.h>
34 #include <sys/filio.h>
35 #include <sys/lock.h>
36 #include <sys/kernel.h>
37 #include <sys/kobj.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41 #include <sys/poll.h>
42 #include <sys/proc.h>
43 #include <sys/condvar.h>
44 #include <sys/queue.h>
45 #include <machine/bus.h>
46 #include <sys/rman.h>
47 #include <sys/selinfo.h>
48 #include <sys/signalvar.h>
49 #include <sys/sysctl.h>
50 #include <sys/systm.h>
51 #include <sys/uio.h>
52 #include <sys/bus.h>
53 #include <sys/interrupt.h>
54
55 #include <machine/stdarg.h>
56
57 #include <vm/uma.h>
58
59 SYSCTL_NODE(_hw, OID_AUTO, bus, CTLFLAG_RW, NULL, NULL);
60 SYSCTL_NODE(, OID_AUTO, dev, CTLFLAG_RW, NULL, NULL);
61
62 /*
63 * Used to attach drivers to devclasses.
64 */
65 typedef struct driverlink *driverlink_t;
66 struct driverlink {
67 kobj_class_t driver;
68 TAILQ_ENTRY(driverlink) link; /* list of drivers in devclass */
69 };
70
71 /*
72 * Forward declarations
73 */
74 typedef TAILQ_HEAD(devclass_list, devclass) devclass_list_t;
75 typedef TAILQ_HEAD(driver_list, driverlink) driver_list_t;
76 typedef TAILQ_HEAD(device_list, device) device_list_t;
77
78 struct devclass {
79 TAILQ_ENTRY(devclass) link;
80 devclass_t parent; /* parent in devclass hierarchy */
81 driver_list_t drivers; /* bus devclasses store drivers for bus */
82 char *name;
83 device_t *devices; /* array of devices indexed by unit */
84 int maxunit; /* size of devices array */
85
86 struct sysctl_ctx_list sysctl_ctx;
87 struct sysctl_oid *sysctl_tree;
88 };
89
90 /**
91 * @brief Implementation of device.
92 */
93 struct device {
94 /*
95 * A device is a kernel object. The first field must be the
96 * current ops table for the object.
97 */
98 KOBJ_FIELDS;
99
100 /*
101 * Device hierarchy.
102 */
103 TAILQ_ENTRY(device) link; /**< list of devices in parent */
104 TAILQ_ENTRY(device) devlink; /**< global device list membership */
105 device_t parent; /**< parent of this device */
106 device_list_t children; /**< list of child devices */
107
108 /*
109 * Details of this device.
110 */
111 driver_t *driver; /**< current driver */
112 devclass_t devclass; /**< current device class */
113 int unit; /**< current unit number */
114 char* nameunit; /**< name+unit e.g. foodev0 */
115 char* desc; /**< driver specific description */
116 int busy; /**< count of calls to device_busy() */
117 device_state_t state; /**< current device state */
118 u_int32_t devflags; /**< api level flags for device_get_flags() */
119 u_short flags; /**< internal device flags */
120 #define DF_ENABLED 1 /* device should be probed/attached */
121 #define DF_FIXEDCLASS 2 /* devclass specified at create time */
122 #define DF_WILDCARD 4 /* unit was originally wildcard */
123 #define DF_DESCMALLOCED 8 /* description was malloced */
124 #define DF_QUIET 16 /* don't print verbose attach message */
125 #define DF_DONENOMATCH 32 /* don't execute DEVICE_NOMATCH again */
126 #define DF_EXTERNALSOFTC 64 /* softc not allocated by us */
127 #define DF_REBID 128 /* Can rebid after attach */
128 u_char order; /**< order from device_add_child_ordered() */
129 u_char pad;
130 void *ivars; /**< instance variables */
131 void *softc; /**< current driver's variables */
132
133 struct sysctl_ctx_list sysctl_ctx; /**< state for sysctl variables */
134 struct sysctl_oid *sysctl_tree; /**< state for sysctl variables */
135 };
136
137 static MALLOC_DEFINE(M_BUS, "bus", "Bus data structures");
138 static MALLOC_DEFINE(M_BUS_SC, "bus-sc", "Bus data structures, softc");
139
140 #ifdef BUS_DEBUG
141
142 static int bus_debug = 1;
143 TUNABLE_INT("bus.debug", &bus_debug);
144 SYSCTL_INT(_debug, OID_AUTO, bus_debug, CTLFLAG_RW, &bus_debug, 0,
145 "Debug bus code");
146
147 #define PDEBUG(a) if (bus_debug) {printf("%s:%d: ", __func__, __LINE__), printf a; printf("\n");}
148 #define DEVICENAME(d) ((d)? device_get_name(d): "no device")
149 #define DRIVERNAME(d) ((d)? d->name : "no driver")
150 #define DEVCLANAME(d) ((d)? d->name : "no devclass")
151
152 /**
153 * Produce the indenting, indent*2 spaces plus a '.' ahead of that to
154 * prevent syslog from deleting initial spaces
155 */
156 #define indentprintf(p) do { int iJ; printf("."); for (iJ=0; iJ<indent; iJ++) printf(" "); printf p ; } while (0)
157
158 static void print_device_short(device_t dev, int indent);
159 static void print_device(device_t dev, int indent);
160 void print_device_tree_short(device_t dev, int indent);
161 void print_device_tree(device_t dev, int indent);
162 static void print_driver_short(driver_t *driver, int indent);
163 static void print_driver(driver_t *driver, int indent);
164 static void print_driver_list(driver_list_t drivers, int indent);
165 static void print_devclass_short(devclass_t dc, int indent);
166 static void print_devclass(devclass_t dc, int indent);
167 void print_devclass_list_short(void);
168 void print_devclass_list(void);
169
170 #else
171 /* Make the compiler ignore the function calls */
172 #define PDEBUG(a) /* nop */
173 #define DEVICENAME(d) /* nop */
174 #define DRIVERNAME(d) /* nop */
175 #define DEVCLANAME(d) /* nop */
176
177 #define print_device_short(d,i) /* nop */
178 #define print_device(d,i) /* nop */
179 #define print_device_tree_short(d,i) /* nop */
180 #define print_device_tree(d,i) /* nop */
181 #define print_driver_short(d,i) /* nop */
182 #define print_driver(d,i) /* nop */
183 #define print_driver_list(d,i) /* nop */
184 #define print_devclass_short(d,i) /* nop */
185 #define print_devclass(d,i) /* nop */
186 #define print_devclass_list_short() /* nop */
187 #define print_devclass_list() /* nop */
188 #endif
189
190 /*
191 * dev sysctl tree
192 */
193
194 enum {
195 DEVCLASS_SYSCTL_PARENT,
196 };
197
198 static int
199 devclass_sysctl_handler(SYSCTL_HANDLER_ARGS)
200 {
201 devclass_t dc = (devclass_t)arg1;
202 const char *value;
203
204 switch (arg2) {
205 case DEVCLASS_SYSCTL_PARENT:
206 value = dc->parent ? dc->parent->name : "";
207 break;
208 default:
209 return (EINVAL);
210 }
211 return (SYSCTL_OUT(req, value, strlen(value)));
212 }
213
214 static void
215 devclass_sysctl_init(devclass_t dc)
216 {
217
218 if (dc->sysctl_tree != NULL)
219 return;
220 sysctl_ctx_init(&dc->sysctl_ctx);
221 dc->sysctl_tree = SYSCTL_ADD_NODE(&dc->sysctl_ctx,
222 SYSCTL_STATIC_CHILDREN(_dev), OID_AUTO, dc->name,
223 CTLFLAG_RD, 0, "");
224 SYSCTL_ADD_PROC(&dc->sysctl_ctx, SYSCTL_CHILDREN(dc->sysctl_tree),
225 OID_AUTO, "%parent", CTLFLAG_RD,
226 dc, DEVCLASS_SYSCTL_PARENT, devclass_sysctl_handler, "A",
227 "parent class");
228 }
229
230 enum {
231 DEVICE_SYSCTL_DESC,
232 DEVICE_SYSCTL_DRIVER,
233 DEVICE_SYSCTL_LOCATION,
234 DEVICE_SYSCTL_PNPINFO,
235 DEVICE_SYSCTL_PARENT,
236 };
237
238 static int
239 device_sysctl_handler(SYSCTL_HANDLER_ARGS)
240 {
241 device_t dev = (device_t)arg1;
242 const char *value;
243 char *buf;
244 int error;
245
246 buf = NULL;
247 switch (arg2) {
248 case DEVICE_SYSCTL_DESC:
249 value = dev->desc ? dev->desc : "";
250 break;
251 case DEVICE_SYSCTL_DRIVER:
252 value = dev->driver ? dev->driver->name : "";
253 break;
254 case DEVICE_SYSCTL_LOCATION:
255 value = buf = malloc(1024, M_BUS, M_WAITOK | M_ZERO);
256 bus_child_location_str(dev, buf, 1024);
257 break;
258 case DEVICE_SYSCTL_PNPINFO:
259 value = buf = malloc(1024, M_BUS, M_WAITOK | M_ZERO);
260 bus_child_pnpinfo_str(dev, buf, 1024);
261 break;
262 case DEVICE_SYSCTL_PARENT:
263 value = dev->parent ? dev->parent->nameunit : "";
264 break;
265 default:
266 return (EINVAL);
267 }
268 error = SYSCTL_OUT(req, value, strlen(value));
269 if (buf != NULL)
270 free(buf, M_BUS);
271 return (error);
272 }
273
274 static void
275 device_sysctl_init(device_t dev)
276 {
277 devclass_t dc = dev->devclass;
278
279 if (dev->sysctl_tree != NULL)
280 return;
281 devclass_sysctl_init(dc);
282 sysctl_ctx_init(&dev->sysctl_ctx);
283 dev->sysctl_tree = SYSCTL_ADD_NODE(&dev->sysctl_ctx,
284 SYSCTL_CHILDREN(dc->sysctl_tree), OID_AUTO,
285 dev->nameunit + strlen(dc->name),
286 CTLFLAG_RD, 0, "");
287 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree),
288 OID_AUTO, "%desc", CTLFLAG_RD,
289 dev, DEVICE_SYSCTL_DESC, device_sysctl_handler, "A",
290 "device description");
291 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree),
292 OID_AUTO, "%driver", CTLFLAG_RD,
293 dev, DEVICE_SYSCTL_DRIVER, device_sysctl_handler, "A",
294 "device driver name");
295 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree),
296 OID_AUTO, "%location", CTLFLAG_RD,
297 dev, DEVICE_SYSCTL_LOCATION, device_sysctl_handler, "A",
298 "device location relative to parent");
299 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree),
300 OID_AUTO, "%pnpinfo", CTLFLAG_RD,
301 dev, DEVICE_SYSCTL_PNPINFO, device_sysctl_handler, "A",
302 "device identification");
303 SYSCTL_ADD_PROC(&dev->sysctl_ctx, SYSCTL_CHILDREN(dev->sysctl_tree),
304 OID_AUTO, "%parent", CTLFLAG_RD,
305 dev, DEVICE_SYSCTL_PARENT, device_sysctl_handler, "A",
306 "parent device");
307 }
308
309 static void
310 device_sysctl_update(device_t dev)
311 {
312 devclass_t dc = dev->devclass;
313
314 if (dev->sysctl_tree == NULL)
315 return;
316 sysctl_rename_oid(dev->sysctl_tree, dev->nameunit + strlen(dc->name));
317 }
318
319 static void
320 device_sysctl_fini(device_t dev)
321 {
322 if (dev->sysctl_tree == NULL)
323 return;
324 sysctl_ctx_free(&dev->sysctl_ctx);
325 dev->sysctl_tree = NULL;
326 }
327
328 /*
329 * /dev/devctl implementation
330 */
331
332 /*
333 * This design allows only one reader for /dev/devctl. This is not desirable
334 * in the long run, but will get a lot of hair out of this implementation.
335 * Maybe we should make this device a clonable device.
336 *
337 * Also note: we specifically do not attach a device to the device_t tree
338 * to avoid potential chicken and egg problems. One could argue that all
339 * of this belongs to the root node. One could also further argue that the
340 * sysctl interface that we have not might more properly be an ioctl
341 * interface, but at this stage of the game, I'm not inclined to rock that
342 * boat.
343 *
344 * I'm also not sure that the SIGIO support is done correctly or not, as
345 * I copied it from a driver that had SIGIO support that likely hasn't been
346 * tested since 3.4 or 2.2.8!
347 */
348
349 static int sysctl_devctl_disable(SYSCTL_HANDLER_ARGS);
350 static int devctl_disable = 0;
351 TUNABLE_INT("hw.bus.devctl_disable", &devctl_disable);
352 SYSCTL_PROC(_hw_bus, OID_AUTO, devctl_disable, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
353 sysctl_devctl_disable, "I", "devctl disable");
354
355 static d_open_t devopen;
356 static d_close_t devclose;
357 static d_read_t devread;
358 static d_ioctl_t devioctl;
359 static d_poll_t devpoll;
360
361 static struct cdevsw dev_cdevsw = {
362 .d_version = D_VERSION,
363 .d_flags = D_NEEDGIANT,
364 .d_open = devopen,
365 .d_close = devclose,
366 .d_read = devread,
367 .d_ioctl = devioctl,
368 .d_poll = devpoll,
369 .d_name = "devctl",
370 };
371
372 struct dev_event_info
373 {
374 char *dei_data;
375 TAILQ_ENTRY(dev_event_info) dei_link;
376 };
377
378 TAILQ_HEAD(devq, dev_event_info);
379
380 static struct dev_softc
381 {
382 int inuse;
383 int nonblock;
384 struct mtx mtx;
385 struct cv cv;
386 struct selinfo sel;
387 struct devq devq;
388 struct proc *async_proc;
389 } devsoftc;
390
391 static struct cdev *devctl_dev;
392
393 static void
394 devinit(void)
395 {
396 devctl_dev = make_dev(&dev_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
397 "devctl");
398 mtx_init(&devsoftc.mtx, "dev mtx", "devd", MTX_DEF);
399 cv_init(&devsoftc.cv, "dev cv");
400 TAILQ_INIT(&devsoftc.devq);
401 }
402
403 static int
404 devopen(struct cdev *dev, int oflags, int devtype, d_thread_t *td)
405 {
406 if (devsoftc.inuse)
407 return (EBUSY);
408 /* move to init */
409 devsoftc.inuse = 1;
410 devsoftc.nonblock = 0;
411 devsoftc.async_proc = NULL;
412 return (0);
413 }
414
415 static int
416 devclose(struct cdev *dev, int fflag, int devtype, d_thread_t *td)
417 {
418 devsoftc.inuse = 0;
419 mtx_lock(&devsoftc.mtx);
420 cv_broadcast(&devsoftc.cv);
421 mtx_unlock(&devsoftc.mtx);
422
423 return (0);
424 }
425
426 /*
427 * The read channel for this device is used to report changes to
428 * userland in realtime. We are required to free the data as well as
429 * the n1 object because we allocate them separately. Also note that
430 * we return one record at a time. If you try to read this device a
431 * character at a time, you will lose the rest of the data. Listening
432 * programs are expected to cope.
433 */
434 static int
435 devread(struct cdev *dev, struct uio *uio, int ioflag)
436 {
437 struct dev_event_info *n1;
438 int rv;
439
440 mtx_lock(&devsoftc.mtx);
441 while (TAILQ_EMPTY(&devsoftc.devq)) {
442 if (devsoftc.nonblock) {
443 mtx_unlock(&devsoftc.mtx);
444 return (EAGAIN);
445 }
446 rv = cv_wait_sig(&devsoftc.cv, &devsoftc.mtx);
447 if (rv) {
448 /*
449 * Need to translate ERESTART to EINTR here? -- jake
450 */
451 mtx_unlock(&devsoftc.mtx);
452 return (rv);
453 }
454 }
455 n1 = TAILQ_FIRST(&devsoftc.devq);
456 TAILQ_REMOVE(&devsoftc.devq, n1, dei_link);
457 mtx_unlock(&devsoftc.mtx);
458 rv = uiomove(n1->dei_data, strlen(n1->dei_data), uio);
459 free(n1->dei_data, M_BUS);
460 free(n1, M_BUS);
461 return (rv);
462 }
463
464 static int
465 devioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, d_thread_t *td)
466 {
467 switch (cmd) {
468
469 case FIONBIO:
470 if (*(int*)data)
471 devsoftc.nonblock = 1;
472 else
473 devsoftc.nonblock = 0;
474 return (0);
475 case FIOASYNC:
476 if (*(int*)data)
477 devsoftc.async_proc = td->td_proc;
478 else
479 devsoftc.async_proc = NULL;
480 return (0);
481
482 /* (un)Support for other fcntl() calls. */
483 case FIOCLEX:
484 case FIONCLEX:
485 case FIONREAD:
486 case FIOSETOWN:
487 case FIOGETOWN:
488 default:
489 break;
490 }
491 return (ENOTTY);
492 }
493
494 static int
495 devpoll(struct cdev *dev, int events, d_thread_t *td)
496 {
497 int revents = 0;
498
499 mtx_lock(&devsoftc.mtx);
500 if (events & (POLLIN | POLLRDNORM)) {
501 if (!TAILQ_EMPTY(&devsoftc.devq))
502 revents = events & (POLLIN | POLLRDNORM);
503 else
504 selrecord(td, &devsoftc.sel);
505 }
506 mtx_unlock(&devsoftc.mtx);
507
508 return (revents);
509 }
510
511 /**
512 * @brief Return whether the userland process is running
513 */
514 boolean_t
515 devctl_process_running(void)
516 {
517 return (devsoftc.inuse == 1);
518 }
519
520 /**
521 * @brief Queue data to be read from the devctl device
522 *
523 * Generic interface to queue data to the devctl device. It is
524 * assumed that @p data is properly formatted. It is further assumed
525 * that @p data is allocated using the M_BUS malloc type.
526 */
527 void
528 devctl_queue_data(char *data)
529 {
530 struct dev_event_info *n1 = NULL;
531 struct proc *p;
532
533 n1 = malloc(sizeof(*n1), M_BUS, M_NOWAIT);
534 if (n1 == NULL)
535 return;
536 n1->dei_data = data;
537 mtx_lock(&devsoftc.mtx);
538 TAILQ_INSERT_TAIL(&devsoftc.devq, n1, dei_link);
539 cv_broadcast(&devsoftc.cv);
540 mtx_unlock(&devsoftc.mtx);
541 selwakeup(&devsoftc.sel);
542 p = devsoftc.async_proc;
543 if (p != NULL) {
544 PROC_LOCK(p);
545 psignal(p, SIGIO);
546 PROC_UNLOCK(p);
547 }
548 }
549
550 /**
551 * @brief Send a 'notification' to userland, using standard ways
552 */
553 void
554 devctl_notify(const char *system, const char *subsystem, const char *type,
555 const char *data)
556 {
557 int len = 0;
558 char *msg;
559
560 if (system == NULL)
561 return; /* BOGUS! Must specify system. */
562 if (subsystem == NULL)
563 return; /* BOGUS! Must specify subsystem. */
564 if (type == NULL)
565 return; /* BOGUS! Must specify type. */
566 len += strlen(" system=") + strlen(system);
567 len += strlen(" subsystem=") + strlen(subsystem);
568 len += strlen(" type=") + strlen(type);
569 /* add in the data message plus newline. */
570 if (data != NULL)
571 len += strlen(data);
572 len += 3; /* '!', '\n', and NUL */
573 msg = malloc(len, M_BUS, M_NOWAIT);
574 if (msg == NULL)
575 return; /* Drop it on the floor */
576 if (data != NULL)
577 snprintf(msg, len, "!system=%s subsystem=%s type=%s %s\n",
578 system, subsystem, type, data);
579 else
580 snprintf(msg, len, "!system=%s subsystem=%s type=%s\n",
581 system, subsystem, type);
582 devctl_queue_data(msg);
583 }
584
585 /*
586 * Common routine that tries to make sending messages as easy as possible.
587 * We allocate memory for the data, copy strings into that, but do not
588 * free it unless there's an error. The dequeue part of the driver should
589 * free the data. We don't send data when the device is disabled. We do
590 * send data, even when we have no listeners, because we wish to avoid
591 * races relating to startup and restart of listening applications.
592 *
593 * devaddq is designed to string together the type of event, with the
594 * object of that event, plus the plug and play info and location info
595 * for that event. This is likely most useful for devices, but less
596 * useful for other consumers of this interface. Those should use
597 * the devctl_queue_data() interface instead.
598 */
599 static void
600 devaddq(const char *type, const char *what, device_t dev)
601 {
602 char *data = NULL;
603 char *loc = NULL;
604 char *pnp = NULL;
605 const char *parstr;
606
607 if (devctl_disable)
608 return;
609 data = malloc(1024, M_BUS, M_NOWAIT);
610 if (data == NULL)
611 goto bad;
612
613 /* get the bus specific location of this device */
614 loc = malloc(1024, M_BUS, M_NOWAIT);
615 if (loc == NULL)
616 goto bad;
617 *loc = '\0';
618 bus_child_location_str(dev, loc, 1024);
619
620 /* Get the bus specific pnp info of this device */
621 pnp = malloc(1024, M_BUS, M_NOWAIT);
622 if (pnp == NULL)
623 goto bad;
624 *pnp = '\0';
625 bus_child_pnpinfo_str(dev, pnp, 1024);
626
627 /* Get the parent of this device, or / if high enough in the tree. */
628 if (device_get_parent(dev) == NULL)
629 parstr = "."; /* Or '/' ? */
630 else
631 parstr = device_get_nameunit(device_get_parent(dev));
632 /* String it all together. */
633 snprintf(data, 1024, "%s%s at %s %s on %s\n", type, what, loc, pnp,
634 parstr);
635 free(loc, M_BUS);
636 free(pnp, M_BUS);
637 devctl_queue_data(data);
638 return;
639 bad:
640 free(pnp, M_BUS);
641 free(loc, M_BUS);
642 free(data, M_BUS);
643 return;
644 }
645
646 /*
647 * A device was added to the tree. We are called just after it successfully
648 * attaches (that is, probe and attach success for this device). No call
649 * is made if a device is merely parented into the tree. See devnomatch
650 * if probe fails. If attach fails, no notification is sent (but maybe
651 * we should have a different message for this).
652 */
653 static void
654 devadded(device_t dev)
655 {
656 char *pnp = NULL;
657 char *tmp = NULL;
658
659 pnp = malloc(1024, M_BUS, M_NOWAIT);
660 if (pnp == NULL)
661 goto fail;
662 tmp = malloc(1024, M_BUS, M_NOWAIT);
663 if (tmp == NULL)
664 goto fail;
665 *pnp = '\0';
666 bus_child_pnpinfo_str(dev, pnp, 1024);
667 snprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp);
668 devaddq("+", tmp, dev);
669 fail:
670 if (pnp != NULL)
671 free(pnp, M_BUS);
672 if (tmp != NULL)
673 free(tmp, M_BUS);
674 return;
675 }
676
677 /*
678 * A device was removed from the tree. We are called just before this
679 * happens.
680 */
681 static void
682 devremoved(device_t dev)
683 {
684 char *pnp = NULL;
685 char *tmp = NULL;
686
687 pnp = malloc(1024, M_BUS, M_NOWAIT);
688 if (pnp == NULL)
689 goto fail;
690 tmp = malloc(1024, M_BUS, M_NOWAIT);
691 if (tmp == NULL)
692 goto fail;
693 *pnp = '\0';
694 bus_child_pnpinfo_str(dev, pnp, 1024);
695 snprintf(tmp, 1024, "%s %s", device_get_nameunit(dev), pnp);
696 devaddq("-", tmp, dev);
697 fail:
698 if (pnp != NULL)
699 free(pnp, M_BUS);
700 if (tmp != NULL)
701 free(tmp, M_BUS);
702 return;
703 }
704
705 /*
706 * Called when there's no match for this device. This is only called
707 * the first time that no match happens, so we don't keep getitng this
708 * message. Should that prove to be undesirable, we can change it.
709 * This is called when all drivers that can attach to a given bus
710 * decline to accept this device. Other errrors may not be detected.
711 */
712 static void
713 devnomatch(device_t dev)
714 {
715 devaddq("?", "", dev);
716 }
717
718 static int
719 sysctl_devctl_disable(SYSCTL_HANDLER_ARGS)
720 {
721 struct dev_event_info *n1;
722 int dis, error;
723
724 dis = devctl_disable;
725 error = sysctl_handle_int(oidp, &dis, 0, req);
726 if (error || !req->newptr)
727 return (error);
728 mtx_lock(&devsoftc.mtx);
729 devctl_disable = dis;
730 if (dis) {
731 while (!TAILQ_EMPTY(&devsoftc.devq)) {
732 n1 = TAILQ_FIRST(&devsoftc.devq);
733 TAILQ_REMOVE(&devsoftc.devq, n1, dei_link);
734 free(n1->dei_data, M_BUS);
735 free(n1, M_BUS);
736 }
737 }
738 mtx_unlock(&devsoftc.mtx);
739 return (0);
740 }
741
742 /* End of /dev/devctl code */
743
744 TAILQ_HEAD(,device) bus_data_devices;
745 static int bus_data_generation = 1;
746
747 kobj_method_t null_methods[] = {
748 { 0, 0 }
749 };
750
751 DEFINE_CLASS(null, null_methods, 0);
752
753 /*
754 * Devclass implementation
755 */
756
757 static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses);
758
759
760 /**
761 * @internal
762 * @brief Find or create a device class
763 *
764 * If a device class with the name @p classname exists, return it,
765 * otherwise if @p create is non-zero create and return a new device
766 * class.
767 *
768 * If @p parentname is non-NULL, the parent of the devclass is set to
769 * the devclass of that name.
770 *
771 * @param classname the devclass name to find or create
772 * @param parentname the parent devclass name or @c NULL
773 * @param create non-zero to create a devclass
774 */
775 static devclass_t
776 devclass_find_internal(const char *classname, const char *parentname,
777 int create)
778 {
779 devclass_t dc;
780
781 PDEBUG(("looking for %s", classname));
782 if (!classname)
783 return (NULL);
784
785 TAILQ_FOREACH(dc, &devclasses, link) {
786 if (!strcmp(dc->name, classname))
787 break;
788 }
789
790 if (create && !dc) {
791 PDEBUG(("creating %s", classname));
792 dc = malloc(sizeof(struct devclass) + strlen(classname) + 1,
793 M_BUS, M_NOWAIT|M_ZERO);
794 if (!dc)
795 return (NULL);
796 dc->parent = NULL;
797 dc->name = (char*) (dc + 1);
798 strcpy(dc->name, classname);
799 TAILQ_INIT(&dc->drivers);
800 TAILQ_INSERT_TAIL(&devclasses, dc, link);
801
802 bus_data_generation_update();
803 }
804
805 /*
806 * If a parent class is specified, then set that as our parent so
807 * that this devclass will support drivers for the parent class as
808 * well. If the parent class has the same name don't do this though
809 * as it creates a cycle that can trigger an infinite loop in
810 * device_probe_child() if a device exists for which there is no
811 * suitable driver.
812 */
813 if (parentname && dc && !dc->parent &&
814 strcmp(classname, parentname) != 0) {
815 dc->parent = devclass_find_internal(parentname, NULL, FALSE);
816 }
817
818 return (dc);
819 }
820
821 /**
822 * @brief Create a device class
823 *
824 * If a device class with the name @p classname exists, return it,
825 * otherwise create and return a new device class.
826 *
827 * @param classname the devclass name to find or create
828 */
829 devclass_t
830 devclass_create(const char *classname)
831 {
832 return (devclass_find_internal(classname, NULL, TRUE));
833 }
834
835 /**
836 * @brief Find a device class
837 *
838 * If a device class with the name @p classname exists, return it,
839 * otherwise return @c NULL.
840 *
841 * @param classname the devclass name to find
842 */
843 devclass_t
844 devclass_find(const char *classname)
845 {
846 return (devclass_find_internal(classname, NULL, FALSE));
847 }
848
849 /**
850 * @brief Add a device driver to a device class
851 *
852 * Add a device driver to a devclass. This is normally called
853 * automatically by DRIVER_MODULE(). The BUS_DRIVER_ADDED() method of
854 * all devices in the devclass will be called to allow them to attempt
855 * to re-probe any unmatched children.
856 *
857 * @param dc the devclass to edit
858 * @param driver the driver to register
859 */
860 int
861 devclass_add_driver(devclass_t dc, driver_t *driver)
862 {
863 driverlink_t dl;
864 int i;
865
866 PDEBUG(("%s", DRIVERNAME(driver)));
867
868 dl = malloc(sizeof *dl, M_BUS, M_NOWAIT|M_ZERO);
869 if (!dl)
870 return (ENOMEM);
871
872 /*
873 * Compile the driver's methods. Also increase the reference count
874 * so that the class doesn't get freed when the last instance
875 * goes. This means we can safely use static methods and avoids a
876 * double-free in devclass_delete_driver.
877 */
878 kobj_class_compile((kobj_class_t) driver);
879
880 /*
881 * Make sure the devclass which the driver is implementing exists.
882 */
883 devclass_find_internal(driver->name, NULL, TRUE);
884
885 dl->driver = driver;
886 TAILQ_INSERT_TAIL(&dc->drivers, dl, link);
887 driver->refs++; /* XXX: kobj_mtx */
888
889 /*
890 * Call BUS_DRIVER_ADDED for any existing busses in this class.
891 */
892 for (i = 0; i < dc->maxunit; i++)
893 if (dc->devices[i])
894 BUS_DRIVER_ADDED(dc->devices[i], driver);
895
896 bus_data_generation_update();
897 return (0);
898 }
899
900 /**
901 * @brief Delete a device driver from a device class
902 *
903 * Delete a device driver from a devclass. This is normally called
904 * automatically by DRIVER_MODULE().
905 *
906 * If the driver is currently attached to any devices,
907 * devclass_delete_driver() will first attempt to detach from each
908 * device. If one of the detach calls fails, the driver will not be
909 * deleted.
910 *
911 * @param dc the devclass to edit
912 * @param driver the driver to unregister
913 */
914 int
915 devclass_delete_driver(devclass_t busclass, driver_t *driver)
916 {
917 devclass_t dc = devclass_find(driver->name);
918 driverlink_t dl;
919 device_t dev;
920 int i;
921 int error;
922
923 PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
924
925 if (!dc)
926 return (0);
927
928 /*
929 * Find the link structure in the bus' list of drivers.
930 */
931 TAILQ_FOREACH(dl, &busclass->drivers, link) {
932 if (dl->driver == driver)
933 break;
934 }
935
936 if (!dl) {
937 PDEBUG(("%s not found in %s list", driver->name,
938 busclass->name));
939 return (ENOENT);
940 }
941
942 /*
943 * Disassociate from any devices. We iterate through all the
944 * devices in the devclass of the driver and detach any which are
945 * using the driver and which have a parent in the devclass which
946 * we are deleting from.
947 *
948 * Note that since a driver can be in multiple devclasses, we
949 * should not detach devices which are not children of devices in
950 * the affected devclass.
951 */
952 for (i = 0; i < dc->maxunit; i++) {
953 if (dc->devices[i]) {
954 dev = dc->devices[i];
955 if (dev->driver == driver && dev->parent &&
956 dev->parent->devclass == busclass) {
957 if ((error = device_detach(dev)) != 0)
958 return (error);
959 device_set_driver(dev, NULL);
960 }
961 }
962 }
963
964 TAILQ_REMOVE(&busclass->drivers, dl, link);
965 free(dl, M_BUS);
966
967 /* XXX: kobj_mtx */
968 driver->refs--;
969 if (driver->refs == 0)
970 kobj_class_free((kobj_class_t) driver);
971
972 bus_data_generation_update();
973 return (0);
974 }
975
976 /**
977 * @brief Quiesces a set of device drivers from a device class
978 *
979 * Quiesce a device driver from a devclass. This is normally called
980 * automatically by DRIVER_MODULE().
981 *
982 * If the driver is currently attached to any devices,
983 * devclass_quiesece_driver() will first attempt to quiesce each
984 * device.
985 *
986 * @param dc the devclass to edit
987 * @param driver the driver to unregister
988 */
989 int
990 devclass_quiesce_driver(devclass_t busclass, driver_t *driver)
991 {
992 devclass_t dc = devclass_find(driver->name);
993 driverlink_t dl;
994 device_t dev;
995 int i;
996 int error;
997
998 PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
999
1000 if (!dc)
1001 return (0);
1002
1003 /*
1004 * Find the link structure in the bus' list of drivers.
1005 */
1006 TAILQ_FOREACH(dl, &busclass->drivers, link) {
1007 if (dl->driver == driver)
1008 break;
1009 }
1010
1011 if (!dl) {
1012 PDEBUG(("%s not found in %s list", driver->name,
1013 busclass->name));
1014 return (ENOENT);
1015 }
1016
1017 /*
1018 * Quiesce all devices. We iterate through all the devices in
1019 * the devclass of the driver and quiesce any which are using
1020 * the driver and which have a parent in the devclass which we
1021 * are quiescing.
1022 *
1023 * Note that since a driver can be in multiple devclasses, we
1024 * should not quiesce devices which are not children of
1025 * devices in the affected devclass.
1026 */
1027 for (i = 0; i < dc->maxunit; i++) {
1028 if (dc->devices[i]) {
1029 dev = dc->devices[i];
1030 if (dev->driver == driver && dev->parent &&
1031 dev->parent->devclass == busclass) {
1032 if ((error = device_quiesce(dev)) != 0)
1033 return (error);
1034 }
1035 }
1036 }
1037
1038 return (0);
1039 }
1040
1041 /**
1042 * @internal
1043 */
1044 static driverlink_t
1045 devclass_find_driver_internal(devclass_t dc, const char *classname)
1046 {
1047 driverlink_t dl;
1048
1049 PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));
1050
1051 TAILQ_FOREACH(dl, &dc->drivers, link) {
1052 if (!strcmp(dl->driver->name, classname))
1053 return (dl);
1054 }
1055
1056 PDEBUG(("not found"));
1057 return (NULL);
1058 }
1059
1060 /**
1061 * @brief Search a devclass for a driver
1062 *
1063 * This function searches the devclass's list of drivers and returns
1064 * the first driver whose name is @p classname or @c NULL if there is
1065 * no driver of that name.
1066 *
1067 * @param dc the devclass to search
1068 * @param classname the driver name to search for
1069 */
1070 kobj_class_t
1071 devclass_find_driver(devclass_t dc, const char *classname)
1072 {
1073 driverlink_t dl;
1074
1075 dl = devclass_find_driver_internal(dc, classname);
1076 if (dl)
1077 return (dl->driver);
1078 return (NULL);
1079 }
1080
1081 /**
1082 * @brief Return the name of the devclass
1083 */
1084 const char *
1085 devclass_get_name(devclass_t dc)
1086 {
1087 return (dc->name);
1088 }
1089
1090 /**
1091 * @brief Find a device given a unit number
1092 *
1093 * @param dc the devclass to search
1094 * @param unit the unit number to search for
1095 *
1096 * @returns the device with the given unit number or @c
1097 * NULL if there is no such device
1098 */
1099 device_t
1100 devclass_get_device(devclass_t dc, int unit)
1101 {
1102 if (dc == NULL || unit < 0 || unit >= dc->maxunit)
1103 return (NULL);
1104 return (dc->devices[unit]);
1105 }
1106
1107 /**
1108 * @brief Find the softc field of a device given a unit number
1109 *
1110 * @param dc the devclass to search
1111 * @param unit the unit number to search for
1112 *
1113 * @returns the softc field of the device with the given
1114 * unit number or @c NULL if there is no such
1115 * device
1116 */
1117 void *
1118 devclass_get_softc(devclass_t dc, int unit)
1119 {
1120 device_t dev;
1121
1122 dev = devclass_get_device(dc, unit);
1123 if (!dev)
1124 return (NULL);
1125
1126 return (device_get_softc(dev));
1127 }
1128
1129 /**
1130 * @brief Get a list of devices in the devclass
1131 *
1132 * An array containing a list of all the devices in the given devclass
1133 * is allocated and returned in @p *devlistp. The number of devices
1134 * in the array is returned in @p *devcountp. The caller should free
1135 * the array using @c free(p, M_TEMP), even if @p *devcountp is 0.
1136 *
1137 * @param dc the devclass to examine
1138 * @param devlistp points at location for array pointer return
1139 * value
1140 * @param devcountp points at location for array size return value
1141 *
1142 * @retval 0 success
1143 * @retval ENOMEM the array allocation failed
1144 */
1145 int
1146 devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp)
1147 {
1148 int count, i;
1149 device_t *list;
1150
1151 count = devclass_get_count(dc);
1152 list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT|M_ZERO);
1153 if (!list)
1154 return (ENOMEM);
1155
1156 count = 0;
1157 for (i = 0; i < dc->maxunit; i++) {
1158 if (dc->devices[i]) {
1159 list[count] = dc->devices[i];
1160 count++;
1161 }
1162 }
1163
1164 *devlistp = list;
1165 *devcountp = count;
1166
1167 return (0);
1168 }
1169
1170 /**
1171 * @brief Get a list of drivers in the devclass
1172 *
1173 * An array containing a list of pointers to all the drivers in the
1174 * given devclass is allocated and returned in @p *listp. The number
1175 * of drivers in the array is returned in @p *countp. The caller should
1176 * free the array using @c free(p, M_TEMP).
1177 *
1178 * @param dc the devclass to examine
1179 * @param listp gives location for array pointer return value
1180 * @param countp gives location for number of array elements
1181 * return value
1182 *
1183 * @retval 0 success
1184 * @retval ENOMEM the array allocation failed
1185 */
1186 int
1187 devclass_get_drivers(devclass_t dc, driver_t ***listp, int *countp)
1188 {
1189 driverlink_t dl;
1190 driver_t **list;
1191 int count;
1192
1193 count = 0;
1194 TAILQ_FOREACH(dl, &dc->drivers, link)
1195 count++;
1196 list = malloc(count * sizeof(driver_t *), M_TEMP, M_NOWAIT);
1197 if (list == NULL)
1198 return (ENOMEM);
1199
1200 count = 0;
1201 TAILQ_FOREACH(dl, &dc->drivers, link) {
1202 list[count] = dl->driver;
1203 count++;
1204 }
1205 *listp = list;
1206 *countp = count;
1207
1208 return (0);
1209 }
1210
1211 /**
1212 * @brief Get the number of devices in a devclass
1213 *
1214 * @param dc the devclass to examine
1215 */
1216 int
1217 devclass_get_count(devclass_t dc)
1218 {
1219 int count, i;
1220
1221 count = 0;
1222 for (i = 0; i < dc->maxunit; i++)
1223 if (dc->devices[i])
1224 count++;
1225 return (count);
1226 }
1227
1228 /**
1229 * @brief Get the maximum unit number used in a devclass
1230 *
1231 * Note that this is one greater than the highest currently-allocated
1232 * unit.
1233 *
1234 * @param dc the devclass to examine
1235 */
1236 int
1237 devclass_get_maxunit(devclass_t dc)
1238 {
1239 return (dc->maxunit);
1240 }
1241
1242 /**
1243 * @brief Find a free unit number in a devclass
1244 *
1245 * This function searches for the first unused unit number greater
1246 * that or equal to @p unit.
1247 *
1248 * @param dc the devclass to examine
1249 * @param unit the first unit number to check
1250 */
1251 int
1252 devclass_find_free_unit(devclass_t dc, int unit)
1253 {
1254 if (dc == NULL)
1255 return (unit);
1256 while (unit < dc->maxunit && dc->devices[unit] != NULL)
1257 unit++;
1258 return (unit);
1259 }
1260
1261 /**
1262 * @brief Set the parent of a devclass
1263 *
1264 * The parent class is normally initialised automatically by
1265 * DRIVER_MODULE().
1266 *
1267 * @param dc the devclass to edit
1268 * @param pdc the new parent devclass
1269 */
1270 void
1271 devclass_set_parent(devclass_t dc, devclass_t pdc)
1272 {
1273 dc->parent = pdc;
1274 }
1275
1276 /**
1277 * @brief Get the parent of a devclass
1278 *
1279 * @param dc the devclass to examine
1280 */
1281 devclass_t
1282 devclass_get_parent(devclass_t dc)
1283 {
1284 return (dc->parent);
1285 }
1286
1287 struct sysctl_ctx_list *
1288 devclass_get_sysctl_ctx(devclass_t dc)
1289 {
1290 return (&dc->sysctl_ctx);
1291 }
1292
1293 struct sysctl_oid *
1294 devclass_get_sysctl_tree(devclass_t dc)
1295 {
1296 return (dc->sysctl_tree);
1297 }
1298
1299 /**
1300 * @internal
1301 * @brief Allocate a unit number
1302 *
1303 * On entry, @p *unitp is the desired unit number (or @c -1 if any
1304 * will do). The allocated unit number is returned in @p *unitp.
1305
1306 * @param dc the devclass to allocate from
1307 * @param unitp points at the location for the allocated unit
1308 * number
1309 *
1310 * @retval 0 success
1311 * @retval EEXIST the requested unit number is already allocated
1312 * @retval ENOMEM memory allocation failure
1313 */
1314 static int
1315 devclass_alloc_unit(devclass_t dc, int *unitp)
1316 {
1317 int unit = *unitp;
1318
1319 PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc)));
1320
1321 /* If we were given a wired unit number, check for existing device */
1322 /* XXX imp XXX */
1323 if (unit != -1) {
1324 if (unit >= 0 && unit < dc->maxunit &&
1325 dc->devices[unit] != NULL) {
1326 if (bootverbose)
1327 printf("%s: %s%d already exists; skipping it\n",
1328 dc->name, dc->name, *unitp);
1329 return (EEXIST);
1330 }
1331 } else {
1332 /* Unwired device, find the next available slot for it */
1333 unit = 0;
1334 while (unit < dc->maxunit && dc->devices[unit] != NULL)
1335 unit++;
1336 }
1337
1338 /*
1339 * We've selected a unit beyond the length of the table, so let's
1340 * extend the table to make room for all units up to and including
1341 * this one.
1342 */
1343 if (unit >= dc->maxunit) {
1344 device_t *newlist;
1345 int newsize;
1346
1347 newsize = roundup((unit + 1), MINALLOCSIZE / sizeof(device_t));
1348 newlist = malloc(sizeof(device_t) * newsize, M_BUS, M_NOWAIT);
1349 if (!newlist)
1350 return (ENOMEM);
1351 bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit);
1352 bzero(newlist + dc->maxunit,
1353 sizeof(device_t) * (newsize - dc->maxunit));
1354 if (dc->devices)
1355 free(dc->devices, M_BUS);
1356 dc->devices = newlist;
1357 dc->maxunit = newsize;
1358 }
1359 PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc)));
1360
1361 *unitp = unit;
1362 return (0);
1363 }
1364
1365 /**
1366 * @internal
1367 * @brief Add a device to a devclass
1368 *
1369 * A unit number is allocated for the device (using the device's
1370 * preferred unit number if any) and the device is registered in the
1371 * devclass. This allows the device to be looked up by its unit
1372 * number, e.g. by decoding a dev_t minor number.
1373 *
1374 * @param dc the devclass to add to
1375 * @param dev the device to add
1376 *
1377 * @retval 0 success
1378 * @retval EEXIST the requested unit number is already allocated
1379 * @retval ENOMEM memory allocation failure
1380 */
1381 static int
1382 devclass_add_device(devclass_t dc, device_t dev)
1383 {
1384 int buflen, error;
1385
1386 PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
1387
1388 buflen = snprintf(NULL, 0, "%s%d$", dc->name, dev->unit);
1389 if (buflen < 0)
1390 return (ENOMEM);
1391 dev->nameunit = malloc(buflen, M_BUS, M_NOWAIT|M_ZERO);
1392 if (!dev->nameunit)
1393 return (ENOMEM);
1394
1395 if ((error = devclass_alloc_unit(dc, &dev->unit)) != 0) {
1396 free(dev->nameunit, M_BUS);
1397 dev->nameunit = NULL;
1398 return (error);
1399 }
1400 dc->devices[dev->unit] = dev;
1401 dev->devclass = dc;
1402 snprintf(dev->nameunit, buflen, "%s%d", dc->name, dev->unit);
1403
1404 return (0);
1405 }
1406
1407 /**
1408 * @internal
1409 * @brief Delete a device from a devclass
1410 *
1411 * The device is removed from the devclass's device list and its unit
1412 * number is freed.
1413
1414 * @param dc the devclass to delete from
1415 * @param dev the device to delete
1416 *
1417 * @retval 0 success
1418 */
1419 static int
1420 devclass_delete_device(devclass_t dc, device_t dev)
1421 {
1422 if (!dc || !dev)
1423 return (0);
1424
1425 PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
1426
1427 if (dev->devclass != dc || dc->devices[dev->unit] != dev)
1428 panic("devclass_delete_device: inconsistent device class");
1429 dc->devices[dev->unit] = NULL;
1430 if (dev->flags & DF_WILDCARD)
1431 dev->unit = -1;
1432 dev->devclass = NULL;
1433 free(dev->nameunit, M_BUS);
1434 dev->nameunit = NULL;
1435
1436 return (0);
1437 }
1438
1439 /**
1440 * @internal
1441 * @brief Make a new device and add it as a child of @p parent
1442 *
1443 * @param parent the parent of the new device
1444 * @param name the devclass name of the new device or @c NULL
1445 * to leave the devclass unspecified
1446 * @parem unit the unit number of the new device of @c -1 to
1447 * leave the unit number unspecified
1448 *
1449 * @returns the new device
1450 */
1451 static device_t
1452 make_device(device_t parent, const char *name, int unit)
1453 {
1454 device_t dev;
1455 devclass_t dc;
1456
1457 PDEBUG(("%s at %s as unit %d", name, DEVICENAME(parent), unit));
1458
1459 if (name) {
1460 dc = devclass_find_internal(name, NULL, TRUE);
1461 if (!dc) {
1462 printf("make_device: can't find device class %s\n",
1463 name);
1464 return (NULL);
1465 }
1466 } else {
1467 dc = NULL;
1468 }
1469
1470 dev = malloc(sizeof(struct device), M_BUS, M_NOWAIT|M_ZERO);
1471 if (!dev)
1472 return (NULL);
1473
1474 dev->parent = parent;
1475 TAILQ_INIT(&dev->children);
1476 kobj_init((kobj_t) dev, &null_class);
1477 dev->driver = NULL;
1478 dev->devclass = NULL;
1479 dev->unit = unit;
1480 dev->nameunit = NULL;
1481 dev->desc = NULL;
1482 dev->busy = 0;
1483 dev->devflags = 0;
1484 dev->flags = DF_ENABLED;
1485 dev->order = 0;
1486 if (unit == -1)
1487 dev->flags |= DF_WILDCARD;
1488 if (name) {
1489 dev->flags |= DF_FIXEDCLASS;
1490 if (devclass_add_device(dc, dev)) {
1491 kobj_delete((kobj_t) dev, M_BUS);
1492 return (NULL);
1493 }
1494 }
1495 dev->ivars = NULL;
1496 dev->softc = NULL;
1497
1498 dev->state = DS_NOTPRESENT;
1499
1500 TAILQ_INSERT_TAIL(&bus_data_devices, dev, devlink);
1501 bus_data_generation_update();
1502
1503 return (dev);
1504 }
1505
1506 /**
1507 * @internal
1508 * @brief Print a description of a device.
1509 */
1510 static int
1511 device_print_child(device_t dev, device_t child)
1512 {
1513 int retval = 0;
1514
1515 if (device_is_alive(child))
1516 retval += BUS_PRINT_CHILD(dev, child);
1517 else
1518 retval += device_printf(child, " not found\n");
1519
1520 return (retval);
1521 }
1522
1523 /**
1524 * @brief Create a new device
1525 *
1526 * This creates a new device and adds it as a child of an existing
1527 * parent device. The new device will be added after the last existing
1528 * child with order zero.
1529 *
1530 * @param dev the device which will be the parent of the
1531 * new child device
1532 * @param name devclass name for new device or @c NULL if not
1533 * specified
1534 * @param unit unit number for new device or @c -1 if not
1535 * specified
1536 *
1537 * @returns the new device
1538 */
1539 device_t
1540 device_add_child(device_t dev, const char *name, int unit)
1541 {
1542 return (device_add_child_ordered(dev, 0, name, unit));
1543 }
1544
1545 /**
1546 * @brief Create a new device
1547 *
1548 * This creates a new device and adds it as a child of an existing
1549 * parent device. The new device will be added after the last existing
1550 * child with the same order.
1551 *
1552 * @param dev the device which will be the parent of the
1553 * new child device
1554 * @param order a value which is used to partially sort the
1555 * children of @p dev - devices created using
1556 * lower values of @p order appear first in @p
1557 * dev's list of children
1558 * @param name devclass name for new device or @c NULL if not
1559 * specified
1560 * @param unit unit number for new device or @c -1 if not
1561 * specified
1562 *
1563 * @returns the new device
1564 */
1565 device_t
1566 device_add_child_ordered(device_t dev, int order, const char *name, int unit)
1567 {
1568 device_t child;
1569 device_t place;
1570
1571 PDEBUG(("%s at %s with order %d as unit %d",
1572 name, DEVICENAME(dev), order, unit));
1573
1574 child = make_device(dev, name, unit);
1575 if (child == NULL)
1576 return (child);
1577 child->order = order;
1578
1579 TAILQ_FOREACH(place, &dev->children, link) {
1580 if (place->order > order)
1581 break;
1582 }
1583
1584 if (place) {
1585 /*
1586 * The device 'place' is the first device whose order is
1587 * greater than the new child.
1588 */
1589 TAILQ_INSERT_BEFORE(place, child, link);
1590 } else {
1591 /*
1592 * The new child's order is greater or equal to the order of
1593 * any existing device. Add the child to the tail of the list.
1594 */
1595 TAILQ_INSERT_TAIL(&dev->children, child, link);
1596 }
1597
1598 bus_data_generation_update();
1599 return (child);
1600 }
1601
1602 /**
1603 * @brief Delete a device
1604 *
1605 * This function deletes a device along with all of its children. If
1606 * the device currently has a driver attached to it, the device is
1607 * detached first using device_detach().
1608 *
1609 * @param dev the parent device
1610 * @param child the device to delete
1611 *
1612 * @retval 0 success
1613 * @retval non-zero a unit error code describing the error
1614 */
1615 int
1616 device_delete_child(device_t dev, device_t child)
1617 {
1618 int error;
1619 device_t grandchild;
1620
1621 PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev)));
1622
1623 /* remove children first */
1624 while ( (grandchild = TAILQ_FIRST(&child->children)) ) {
1625 error = device_delete_child(child, grandchild);
1626 if (error)
1627 return (error);
1628 }
1629
1630 if ((error = device_detach(child)) != 0)
1631 return (error);
1632 if (child->devclass)
1633 devclass_delete_device(child->devclass, child);
1634 TAILQ_REMOVE(&dev->children, child, link);
1635 TAILQ_REMOVE(&bus_data_devices, child, devlink);
1636 kobj_delete((kobj_t) child, M_BUS);
1637
1638 bus_data_generation_update();
1639 return (0);
1640 }
1641
1642 /**
1643 * @brief Find a device given a unit number
1644 *
1645 * This is similar to devclass_get_devices() but only searches for
1646 * devices which have @p dev as a parent.
1647 *
1648 * @param dev the parent device to search
1649 * @param unit the unit number to search for. If the unit is -1,
1650 * return the first child of @p dev which has name
1651 * @p classname (that is, the one with the lowest unit.)
1652 *
1653 * @returns the device with the given unit number or @c
1654 * NULL if there is no such device
1655 */
1656 device_t
1657 device_find_child(device_t dev, const char *classname, int unit)
1658 {
1659 devclass_t dc;
1660 device_t child;
1661
1662 dc = devclass_find(classname);
1663 if (!dc)
1664 return (NULL);
1665
1666 if (unit != -1) {
1667 child = devclass_get_device(dc, unit);
1668 if (child && child->parent == dev)
1669 return (child);
1670 } else {
1671 for (unit = 0; unit < devclass_get_maxunit(dc); unit++) {
1672 child = devclass_get_device(dc, unit);
1673 if (child && child->parent == dev)
1674 return (child);
1675 }
1676 }
1677 return (NULL);
1678 }
1679
1680 /**
1681 * @internal
1682 */
1683 static driverlink_t
1684 first_matching_driver(devclass_t dc, device_t dev)
1685 {
1686 if (dev->devclass)
1687 return (devclass_find_driver_internal(dc, dev->devclass->name));
1688 return (TAILQ_FIRST(&dc->drivers));
1689 }
1690
1691 /**
1692 * @internal
1693 */
1694 static driverlink_t
1695 next_matching_driver(devclass_t dc, device_t dev, driverlink_t last)
1696 {
1697 if (dev->devclass) {
1698 driverlink_t dl;
1699 for (dl = TAILQ_NEXT(last, link); dl; dl = TAILQ_NEXT(dl, link))
1700 if (!strcmp(dev->devclass->name, dl->driver->name))
1701 return (dl);
1702 return (NULL);
1703 }
1704 return (TAILQ_NEXT(last, link));
1705 }
1706
1707 /**
1708 * @internal
1709 */
1710 int
1711 device_probe_child(device_t dev, device_t child)
1712 {
1713 devclass_t dc;
1714 driverlink_t best = NULL;
1715 driverlink_t dl;
1716 int result, pri = 0;
1717 int hasclass = (child->devclass != 0);
1718
1719 GIANT_REQUIRED;
1720
1721 dc = dev->devclass;
1722 if (!dc)
1723 panic("device_probe_child: parent device has no devclass");
1724
1725 /*
1726 * If the state is already probed, then return. However, don't
1727 * return if we can rebid this object.
1728 */
1729 if (child->state == DS_ALIVE && (child->flags & DF_REBID) == 0)
1730 return (0);
1731
1732 for (; dc; dc = dc->parent) {
1733 for (dl = first_matching_driver(dc, child);
1734 dl;
1735 dl = next_matching_driver(dc, child, dl)) {
1736 PDEBUG(("Trying %s", DRIVERNAME(dl->driver)));
1737 device_set_driver(child, dl->driver);
1738 if (!hasclass) {
1739 if (device_set_devclass(child, dl->driver->name)) {
1740 PDEBUG(("Unable to set device class"));
1741 device_set_driver(child, NULL);
1742 continue;
1743 }
1744 }
1745
1746 /* Fetch any flags for the device before probing. */
1747 resource_int_value(dl->driver->name, child->unit,
1748 "flags", &child->devflags);
1749
1750 result = DEVICE_PROBE(child);
1751
1752 /* Reset flags and devclass before the next probe. */
1753 child->devflags = 0;
1754 if (!hasclass)
1755 device_set_devclass(child, NULL);
1756
1757 /*
1758 * If the driver returns SUCCESS, there can be
1759 * no higher match for this device.
1760 */
1761 if (result == 0) {
1762 best = dl;
1763 pri = 0;
1764 break;
1765 }
1766
1767 /*
1768 * The driver returned an error so it
1769 * certainly doesn't match.
1770 */
1771 if (result > 0) {
1772 device_set_driver(child, NULL);
1773 continue;
1774 }
1775
1776 /*
1777 * A priority lower than SUCCESS, remember the
1778 * best matching driver. Initialise the value
1779 * of pri for the first match.
1780 */
1781 if (best == NULL || result > pri) {
1782 best = dl;
1783 pri = result;
1784 continue;
1785 }
1786 }
1787 /*
1788 * If we have an unambiguous match in this devclass,
1789 * don't look in the parent.
1790 */
1791 if (best && pri == 0)
1792 break;
1793 }
1794
1795 /*
1796 * If we found a driver, change state and initialise the devclass.
1797 */
1798 /* XXX What happens if we rebid and got no best? */
1799 if (best) {
1800 /*
1801 * If this device was atached, and we were asked to
1802 * rescan, and it is a different driver, then we have
1803 * to detach the old driver and reattach this new one.
1804 * Note, we don't have to check for DF_REBID here
1805 * because if the state is > DS_ALIVE, we know it must
1806 * be.
1807 *
1808 * This assumes that all DF_REBID drivers can have
1809 * their probe routine called at any time and that
1810 * they are idempotent as well as completely benign in
1811 * normal operations.
1812 *
1813 * We also have to make sure that the detach
1814 * succeeded, otherwise we fail the operation (or
1815 * maybe it should just fail silently? I'm torn).
1816 */
1817 if (child->state > DS_ALIVE && best->driver != child->driver)
1818 if ((result = device_detach(dev)) != 0)
1819 return (result);
1820
1821 /* Set the winning driver, devclass, and flags. */
1822 if (!child->devclass) {
1823 result = device_set_devclass(child, best->driver->name);
1824 if (result != 0)
1825 return (result);
1826 }
1827 device_set_driver(child, best->driver);
1828 resource_int_value(best->driver->name, child->unit,
1829 "flags", &child->devflags);
1830
1831 if (pri < 0) {
1832 /*
1833 * A bit bogus. Call the probe method again to make
1834 * sure that we have the right description.
1835 */
1836 DEVICE_PROBE(child);
1837 #if 0
1838 child->flags |= DF_REBID;
1839 #endif
1840 } else
1841 child->flags &= ~DF_REBID;
1842 child->state = DS_ALIVE;
1843
1844 bus_data_generation_update();
1845 return (0);
1846 }
1847
1848 return (ENXIO);
1849 }
1850
1851 /**
1852 * @brief Return the parent of a device
1853 */
1854 device_t
1855 device_get_parent(device_t dev)
1856 {
1857 return (dev->parent);
1858 }
1859
1860 /**
1861 * @brief Get a list of children of a device
1862 *
1863 * An array containing a list of all the children of the given device
1864 * is allocated and returned in @p *devlistp. The number of devices
1865 * in the array is returned in @p *devcountp. The caller should free
1866 * the array using @c free(p, M_TEMP).
1867 *
1868 * @param dev the device to examine
1869 * @param devlistp points at location for array pointer return
1870 * value
1871 * @param devcountp points at location for array size return value
1872 *
1873 * @retval 0 success
1874 * @retval ENOMEM the array allocation failed
1875 */
1876 int
1877 device_get_children(device_t dev, device_t **devlistp, int *devcountp)
1878 {
1879 int count;
1880 device_t child;
1881 device_t *list;
1882
1883 count = 0;
1884 TAILQ_FOREACH(child, &dev->children, link) {
1885 count++;
1886 }
1887
1888 list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT|M_ZERO);
1889 if (!list)
1890 return (ENOMEM);
1891
1892 count = 0;
1893 TAILQ_FOREACH(child, &dev->children, link) {
1894 list[count] = child;
1895 count++;
1896 }
1897
1898 *devlistp = list;
1899 *devcountp = count;
1900
1901 return (0);
1902 }
1903
1904 /**
1905 * @brief Return the current driver for the device or @c NULL if there
1906 * is no driver currently attached
1907 */
1908 driver_t *
1909 device_get_driver(device_t dev)
1910 {
1911 return (dev->driver);
1912 }
1913
1914 /**
1915 * @brief Return the current devclass for the device or @c NULL if
1916 * there is none.
1917 */
1918 devclass_t
1919 device_get_devclass(device_t dev)
1920 {
1921 return (dev->devclass);
1922 }
1923
1924 /**
1925 * @brief Return the name of the device's devclass or @c NULL if there
1926 * is none.
1927 */
1928 const char *
1929 device_get_name(device_t dev)
1930 {
1931 if (dev != NULL && dev->devclass)
1932 return (devclass_get_name(dev->devclass));
1933 return (NULL);
1934 }
1935
1936 /**
1937 * @brief Return a string containing the device's devclass name
1938 * followed by an ascii representation of the device's unit number
1939 * (e.g. @c "foo2").
1940 */
1941 const char *
1942 device_get_nameunit(device_t dev)
1943 {
1944 return (dev->nameunit);
1945 }
1946
1947 /**
1948 * @brief Return the device's unit number.
1949 */
1950 int
1951 device_get_unit(device_t dev)
1952 {
1953 return (dev->unit);
1954 }
1955
1956 /**
1957 * @brief Return the device's description string
1958 */
1959 const char *
1960 device_get_desc(device_t dev)
1961 {
1962 return (dev->desc);
1963 }
1964
1965 /**
1966 * @brief Return the device's flags
1967 */
1968 u_int32_t
1969 device_get_flags(device_t dev)
1970 {
1971 return (dev->devflags);
1972 }
1973
1974 struct sysctl_ctx_list *
1975 device_get_sysctl_ctx(device_t dev)
1976 {
1977 return (&dev->sysctl_ctx);
1978 }
1979
1980 struct sysctl_oid *
1981 device_get_sysctl_tree(device_t dev)
1982 {
1983 return (dev->sysctl_tree);
1984 }
1985
1986 /**
1987 * @brief Print the name of the device followed by a colon and a space
1988 *
1989 * @returns the number of characters printed
1990 */
1991 int
1992 device_print_prettyname(device_t dev)
1993 {
1994 const char *name = device_get_name(dev);
1995
1996 if (name == 0)
1997 return (printf("unknown: "));
1998 return (printf("%s%d: ", name, device_get_unit(dev)));
1999 }
2000
2001 /**
2002 * @brief Print the name of the device followed by a colon, a space
2003 * and the result of calling vprintf() with the value of @p fmt and
2004 * the following arguments.
2005 *
2006 * @returns the number of characters printed
2007 */
2008 int
2009 device_printf(device_t dev, const char * fmt, ...)
2010 {
2011 va_list ap;
2012 int retval;
2013
2014 retval = device_print_prettyname(dev);
2015 va_start(ap, fmt);
2016 retval += vprintf(fmt, ap);
2017 va_end(ap);
2018 return (retval);
2019 }
2020
2021 /**
2022 * @internal
2023 */
2024 static void
2025 device_set_desc_internal(device_t dev, const char* desc, int copy)
2026 {
2027 if (dev->desc && (dev->flags & DF_DESCMALLOCED)) {
2028 free(dev->desc, M_BUS);
2029 dev->flags &= ~DF_DESCMALLOCED;
2030 dev->desc = NULL;
2031 }
2032
2033 if (copy && desc) {
2034 dev->desc = malloc(strlen(desc) + 1, M_BUS, M_NOWAIT);
2035 if (dev->desc) {
2036 strcpy(dev->desc, desc);
2037 dev->flags |= DF_DESCMALLOCED;
2038 }
2039 } else {
2040 /* Avoid a -Wcast-qual warning */
2041 dev->desc = (char *)(uintptr_t) desc;
2042 }
2043
2044 bus_data_generation_update();
2045 }
2046
2047 /**
2048 * @brief Set the device's description
2049 *
2050 * The value of @c desc should be a string constant that will not
2051 * change (at least until the description is changed in a subsequent
2052 * call to device_set_desc() or device_set_desc_copy()).
2053 */
2054 void
2055 device_set_desc(device_t dev, const char* desc)
2056 {
2057 device_set_desc_internal(dev, desc, FALSE);
2058 }
2059
2060 /**
2061 * @brief Set the device's description
2062 *
2063 * The string pointed to by @c desc is copied. Use this function if
2064 * the device description is generated, (e.g. with sprintf()).
2065 */
2066 void
2067 device_set_desc_copy(device_t dev, const char* desc)
2068 {
2069 device_set_desc_internal(dev, desc, TRUE);
2070 }
2071
2072 /**
2073 * @brief Set the device's flags
2074 */
2075 void
2076 device_set_flags(device_t dev, u_int32_t flags)
2077 {
2078 dev->devflags = flags;
2079 }
2080
2081 /**
2082 * @brief Return the device's softc field
2083 *
2084 * The softc is allocated and zeroed when a driver is attached, based
2085 * on the size field of the driver.
2086 */
2087 void *
2088 device_get_softc(device_t dev)
2089 {
2090 return (dev->softc);
2091 }
2092
2093 /**
2094 * @brief Set the device's softc field
2095 *
2096 * Most drivers do not need to use this since the softc is allocated
2097 * automatically when the driver is attached.
2098 */
2099 void
2100 device_set_softc(device_t dev, void *softc)
2101 {
2102 if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC))
2103 free(dev->softc, M_BUS_SC);
2104 dev->softc = softc;
2105 if (dev->softc)
2106 dev->flags |= DF_EXTERNALSOFTC;
2107 else
2108 dev->flags &= ~DF_EXTERNALSOFTC;
2109 }
2110
2111 /**
2112 * @brief Get the device's ivars field
2113 *
2114 * The ivars field is used by the parent device to store per-device
2115 * state (e.g. the physical location of the device or a list of
2116 * resources).
2117 */
2118 void *
2119 device_get_ivars(device_t dev)
2120 {
2121
2122 KASSERT(dev != NULL, ("device_get_ivars(NULL, ...)"));
2123 return (dev->ivars);
2124 }
2125
2126 /**
2127 * @brief Set the device's ivars field
2128 */
2129 void
2130 device_set_ivars(device_t dev, void * ivars)
2131 {
2132
2133 KASSERT(dev != NULL, ("device_set_ivars(NULL, ...)"));
2134 dev->ivars = ivars;
2135 }
2136
2137 /**
2138 * @brief Return the device's state
2139 */
2140 device_state_t
2141 device_get_state(device_t dev)
2142 {
2143 return (dev->state);
2144 }
2145
2146 /**
2147 * @brief Set the DF_ENABLED flag for the device
2148 */
2149 void
2150 device_enable(device_t dev)
2151 {
2152 dev->flags |= DF_ENABLED;
2153 }
2154
2155 /**
2156 * @brief Clear the DF_ENABLED flag for the device
2157 */
2158 void
2159 device_disable(device_t dev)
2160 {
2161 dev->flags &= ~DF_ENABLED;
2162 }
2163
2164 /**
2165 * @brief Increment the busy counter for the device
2166 */
2167 void
2168 device_busy(device_t dev)
2169 {
2170 if (dev->state < DS_ATTACHED)
2171 panic("device_busy: called for unattached device");
2172 if (dev->busy == 0 && dev->parent)
2173 device_busy(dev->parent);
2174 dev->busy++;
2175 dev->state = DS_BUSY;
2176 }
2177
2178 /**
2179 * @brief Decrement the busy counter for the device
2180 */
2181 void
2182 device_unbusy(device_t dev)
2183 {
2184 if (dev->state != DS_BUSY)
2185 panic("device_unbusy: called for non-busy device %s",
2186 device_get_nameunit(dev));
2187 dev->busy--;
2188 if (dev->busy == 0) {
2189 if (dev->parent)
2190 device_unbusy(dev->parent);
2191 dev->state = DS_ATTACHED;
2192 }
2193 }
2194
2195 /**
2196 * @brief Set the DF_QUIET flag for the device
2197 */
2198 void
2199 device_quiet(device_t dev)
2200 {
2201 dev->flags |= DF_QUIET;
2202 }
2203
2204 /**
2205 * @brief Clear the DF_QUIET flag for the device
2206 */
2207 void
2208 device_verbose(device_t dev)
2209 {
2210 dev->flags &= ~DF_QUIET;
2211 }
2212
2213 /**
2214 * @brief Return non-zero if the DF_QUIET flag is set on the device
2215 */
2216 int
2217 device_is_quiet(device_t dev)
2218 {
2219 return ((dev->flags & DF_QUIET) != 0);
2220 }
2221
2222 /**
2223 * @brief Return non-zero if the DF_ENABLED flag is set on the device
2224 */
2225 int
2226 device_is_enabled(device_t dev)
2227 {
2228 return ((dev->flags & DF_ENABLED) != 0);
2229 }
2230
2231 /**
2232 * @brief Return non-zero if the device was successfully probed
2233 */
2234 int
2235 device_is_alive(device_t dev)
2236 {
2237 return (dev->state >= DS_ALIVE);
2238 }
2239
2240 /**
2241 * @brief Return non-zero if the device currently has a driver
2242 * attached to it
2243 */
2244 int
2245 device_is_attached(device_t dev)
2246 {
2247 return (dev->state >= DS_ATTACHED);
2248 }
2249
2250 /**
2251 * @brief Set the devclass of a device
2252 * @see devclass_add_device().
2253 */
2254 int
2255 device_set_devclass(device_t dev, const char *classname)
2256 {
2257 devclass_t dc;
2258 int error;
2259
2260 if (!classname) {
2261 if (dev->devclass)
2262 devclass_delete_device(dev->devclass, dev);
2263 return (0);
2264 }
2265
2266 if (dev->devclass) {
2267 printf("device_set_devclass: device class already set\n");
2268 return (EINVAL);
2269 }
2270
2271 dc = devclass_find_internal(classname, NULL, TRUE);
2272 if (!dc)
2273 return (ENOMEM);
2274
2275 error = devclass_add_device(dc, dev);
2276
2277 bus_data_generation_update();
2278 return (error);
2279 }
2280
2281 /**
2282 * @brief Set the driver of a device
2283 *
2284 * @retval 0 success
2285 * @retval EBUSY the device already has a driver attached
2286 * @retval ENOMEM a memory allocation failure occurred
2287 */
2288 int
2289 device_set_driver(device_t dev, driver_t *driver)
2290 {
2291 if (dev->state >= DS_ATTACHED)
2292 return (EBUSY);
2293
2294 if (dev->driver == driver)
2295 return (0);
2296
2297 if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC)) {
2298 free(dev->softc, M_BUS_SC);
2299 dev->softc = NULL;
2300 }
2301 kobj_delete((kobj_t) dev, NULL);
2302 dev->driver = driver;
2303 if (driver) {
2304 kobj_init((kobj_t) dev, (kobj_class_t) driver);
2305 if (!(dev->flags & DF_EXTERNALSOFTC) && driver->size > 0) {
2306 dev->softc = malloc(driver->size, M_BUS_SC,
2307 M_NOWAIT | M_ZERO);
2308 if (!dev->softc) {
2309 kobj_delete((kobj_t) dev, NULL);
2310 kobj_init((kobj_t) dev, &null_class);
2311 dev->driver = NULL;
2312 return (ENOMEM);
2313 }
2314 }
2315 } else {
2316 kobj_init((kobj_t) dev, &null_class);
2317 }
2318
2319 bus_data_generation_update();
2320 return (0);
2321 }
2322
2323 /**
2324 * @brief Probe a device and attach a driver if possible
2325 *
2326 * This function is the core of the device autoconfiguration
2327 * system. Its purpose is to select a suitable driver for a device and
2328 * then call that driver to initialise the hardware appropriately. The
2329 * driver is selected by calling the DEVICE_PROBE() method of a set of
2330 * candidate drivers and then choosing the driver which returned the
2331 * best value. This driver is then attached to the device using
2332 * device_attach().
2333 *
2334 * The set of suitable drivers is taken from the list of drivers in
2335 * the parent device's devclass. If the device was originally created
2336 * with a specific class name (see device_add_child()), only drivers
2337 * with that name are probed, otherwise all drivers in the devclass
2338 * are probed. If no drivers return successful probe values in the
2339 * parent devclass, the search continues in the parent of that
2340 * devclass (see devclass_get_parent()) if any.
2341 *
2342 * @param dev the device to initialise
2343 *
2344 * @retval 0 success
2345 * @retval ENXIO no driver was found
2346 * @retval ENOMEM memory allocation failure
2347 * @retval non-zero some other unix error code
2348 */
2349 int
2350 device_probe_and_attach(device_t dev)
2351 {
2352 int error;
2353
2354 GIANT_REQUIRED;
2355
2356 if (dev->state >= DS_ALIVE && (dev->flags & DF_REBID) == 0)
2357 return (0);
2358
2359 if (!(dev->flags & DF_ENABLED)) {
2360 if (bootverbose && device_get_name(dev) != NULL) {
2361 device_print_prettyname(dev);
2362 printf("not probed (disabled)\n");
2363 }
2364 return (0);
2365 }
2366 if ((error = device_probe_child(dev->parent, dev)) != 0) {
2367 if (!(dev->flags & DF_DONENOMATCH)) {
2368 BUS_PROBE_NOMATCH(dev->parent, dev);
2369 devnomatch(dev);
2370 dev->flags |= DF_DONENOMATCH;
2371 }
2372 return (error);
2373 }
2374 error = device_attach(dev);
2375
2376 return (error);
2377 }
2378
2379 /**
2380 * @brief Attach a device driver to a device
2381 *
2382 * This function is a wrapper around the DEVICE_ATTACH() driver
2383 * method. In addition to calling DEVICE_ATTACH(), it initialises the
2384 * device's sysctl tree, optionally prints a description of the device
2385 * and queues a notification event for user-based device management
2386 * services.
2387 *
2388 * Normally this function is only called internally from
2389 * device_probe_and_attach().
2390 *
2391 * @param dev the device to initialise
2392 *
2393 * @retval 0 success
2394 * @retval ENXIO no driver was found
2395 * @retval ENOMEM memory allocation failure
2396 * @retval non-zero some other unix error code
2397 */
2398 int
2399 device_attach(device_t dev)
2400 {
2401 int error;
2402
2403 device_sysctl_init(dev);
2404 if (!device_is_quiet(dev))
2405 device_print_child(dev->parent, dev);
2406 if ((error = DEVICE_ATTACH(dev)) != 0) {
2407 printf("device_attach: %s%d attach returned %d\n",
2408 dev->driver->name, dev->unit, error);
2409 /* Unset the class; set in device_probe_child */
2410 if (dev->devclass == NULL)
2411 device_set_devclass(dev, NULL);
2412 device_set_driver(dev, NULL);
2413 device_sysctl_fini(dev);
2414 dev->state = DS_NOTPRESENT;
2415 return (error);
2416 }
2417 device_sysctl_update(dev);
2418 dev->state = DS_ATTACHED;
2419 devadded(dev);
2420 return (0);
2421 }
2422
2423 /**
2424 * @brief Detach a driver from a device
2425 *
2426 * This function is a wrapper around the DEVICE_DETACH() driver
2427 * method. If the call to DEVICE_DETACH() succeeds, it calls
2428 * BUS_CHILD_DETACHED() for the parent of @p dev, queues a
2429 * notification event for user-based device management services and
2430 * cleans up the device's sysctl tree.
2431 *
2432 * @param dev the device to un-initialise
2433 *
2434 * @retval 0 success
2435 * @retval ENXIO no driver was found
2436 * @retval ENOMEM memory allocation failure
2437 * @retval non-zero some other unix error code
2438 */
2439 int
2440 device_detach(device_t dev)
2441 {
2442 int error;
2443
2444 GIANT_REQUIRED;
2445
2446 PDEBUG(("%s", DEVICENAME(dev)));
2447 if (dev->state == DS_BUSY)
2448 return (EBUSY);
2449 if (dev->state != DS_ATTACHED)
2450 return (0);
2451
2452 if ((error = DEVICE_DETACH(dev)) != 0)
2453 return (error);
2454 devremoved(dev);
2455 if (!device_is_quiet(dev))
2456 device_printf(dev, "detached\n");
2457 if (dev->parent)
2458 BUS_CHILD_DETACHED(dev->parent, dev);
2459
2460 if (!(dev->flags & DF_FIXEDCLASS))
2461 devclass_delete_device(dev->devclass, dev);
2462
2463 dev->state = DS_NOTPRESENT;
2464 device_set_driver(dev, NULL);
2465 device_set_desc(dev, NULL);
2466 device_sysctl_fini(dev);
2467
2468 return (0);
2469 }
2470
2471 /**
2472 * @brief Tells a driver to quiesce itself.
2473 *
2474 * This function is a wrapper around the DEVICE_QUIESCE() driver
2475 * method. If the call to DEVICE_QUIESCE() succeeds.
2476 *
2477 * @param dev the device to quiesce
2478 *
2479 * @retval 0 success
2480 * @retval ENXIO no driver was found
2481 * @retval ENOMEM memory allocation failure
2482 * @retval non-zero some other unix error code
2483 */
2484 int
2485 device_quiesce(device_t dev)
2486 {
2487
2488 PDEBUG(("%s", DEVICENAME(dev)));
2489 if (dev->state == DS_BUSY)
2490 return (EBUSY);
2491 if (dev->state != DS_ATTACHED)
2492 return (0);
2493
2494 return (DEVICE_QUIESCE(dev));
2495 }
2496
2497 /**
2498 * @brief Notify a device of system shutdown
2499 *
2500 * This function calls the DEVICE_SHUTDOWN() driver method if the
2501 * device currently has an attached driver.
2502 *
2503 * @returns the value returned by DEVICE_SHUTDOWN()
2504 */
2505 int
2506 device_shutdown(device_t dev)
2507 {
2508 if (dev->state < DS_ATTACHED)
2509 return (0);
2510 return (DEVICE_SHUTDOWN(dev));
2511 }
2512
2513 /**
2514 * @brief Set the unit number of a device
2515 *
2516 * This function can be used to override the unit number used for a
2517 * device (e.g. to wire a device to a pre-configured unit number).
2518 */
2519 int
2520 device_set_unit(device_t dev, int unit)
2521 {
2522 devclass_t dc;
2523 int err;
2524
2525 dc = device_get_devclass(dev);
2526 if (unit < dc->maxunit && dc->devices[unit])
2527 return (EBUSY);
2528 err = devclass_delete_device(dc, dev);
2529 if (err)
2530 return (err);
2531 dev->unit = unit;
2532 err = devclass_add_device(dc, dev);
2533 if (err)
2534 return (err);
2535
2536 bus_data_generation_update();
2537 return (0);
2538 }
2539
2540 /*======================================*/
2541 /*
2542 * Some useful method implementations to make life easier for bus drivers.
2543 */
2544
2545 /**
2546 * @brief Initialise a resource list.
2547 *
2548 * @param rl the resource list to initialise
2549 */
2550 void
2551 resource_list_init(struct resource_list *rl)
2552 {
2553 STAILQ_INIT(rl);
2554 }
2555
2556 /**
2557 * @brief Reclaim memory used by a resource list.
2558 *
2559 * This function frees the memory for all resource entries on the list
2560 * (if any).
2561 *
2562 * @param rl the resource list to free
2563 */
2564 void
2565 resource_list_free(struct resource_list *rl)
2566 {
2567 struct resource_list_entry *rle;
2568
2569 while ((rle = STAILQ_FIRST(rl)) != NULL) {
2570 if (rle->res)
2571 panic("resource_list_free: resource entry is busy");
2572 STAILQ_REMOVE_HEAD(rl, link);
2573 free(rle, M_BUS);
2574 }
2575 }
2576
2577 /**
2578 * @brief Add a resource entry.
2579 *
2580 * This function adds a resource entry using the given @p type, @p
2581 * start, @p end and @p count values. A rid value is chosen by
2582 * searching sequentially for the first unused rid starting at zero.
2583 *
2584 * @param rl the resource list to edit
2585 * @param type the resource entry type (e.g. SYS_RES_MEMORY)
2586 * @param start the start address of the resource
2587 * @param end the end address of the resource
2588 * @param count XXX end-start+1
2589 */
2590 int
2591 resource_list_add_next(struct resource_list *rl, int type, u_long start,
2592 u_long end, u_long count)
2593 {
2594 int rid;
2595
2596 rid = 0;
2597 while (resource_list_find(rl, type, rid) != NULL)
2598 rid++;
2599 resource_list_add(rl, type, rid, start, end, count);
2600 return (rid);
2601 }
2602
2603 /**
2604 * @brief Add or modify a resource entry.
2605 *
2606 * If an existing entry exists with the same type and rid, it will be
2607 * modified using the given values of @p start, @p end and @p
2608 * count. If no entry exists, a new one will be created using the
2609 * given values. The resource list entry that matches is then returned.
2610 *
2611 * @param rl the resource list to edit
2612 * @param type the resource entry type (e.g. SYS_RES_MEMORY)
2613 * @param rid the resource identifier
2614 * @param start the start address of the resource
2615 * @param end the end address of the resource
2616 * @param count XXX end-start+1
2617 */
2618 struct resource_list_entry *
2619 resource_list_add(struct resource_list *rl, int type, int rid,
2620 u_long start, u_long end, u_long count)
2621 {
2622 struct resource_list_entry *rle;
2623
2624 rle = resource_list_find(rl, type, rid);
2625 if (!rle) {
2626 rle = malloc(sizeof(struct resource_list_entry), M_BUS,
2627 M_NOWAIT);
2628 if (!rle)
2629 panic("resource_list_add: can't record entry");
2630 STAILQ_INSERT_TAIL(rl, rle, link);
2631 rle->type = type;
2632 rle->rid = rid;
2633 rle->res = NULL;
2634 }
2635
2636 if (rle->res)
2637 panic("resource_list_add: resource entry is busy");
2638
2639 rle->start = start;
2640 rle->end = end;
2641 rle->count = count;
2642 return (rle);
2643 }
2644
2645 /**
2646 * @brief Find a resource entry by type and rid.
2647 *
2648 * @param rl the resource list to search
2649 * @param type the resource entry type (e.g. SYS_RES_MEMORY)
2650 * @param rid the resource identifier
2651 *
2652 * @returns the resource entry pointer or NULL if there is no such
2653 * entry.
2654 */
2655 struct resource_list_entry *
2656 resource_list_find(struct resource_list *rl, int type, int rid)
2657 {
2658 struct resource_list_entry *rle;
2659
2660 STAILQ_FOREACH(rle, rl, link) {
2661 if (rle->type == type && rle->rid == rid)
2662 return (rle);
2663 }
2664 return (NULL);
2665 }
2666
2667 /**
2668 * @brief Delete a resource entry.
2669 *
2670 * @param rl the resource list to edit
2671 * @param type the resource entry type (e.g. SYS_RES_MEMORY)
2672 * @param rid the resource identifier
2673 */
2674 void
2675 resource_list_delete(struct resource_list *rl, int type, int rid)
2676 {
2677 struct resource_list_entry *rle = resource_list_find(rl, type, rid);
2678
2679 if (rle) {
2680 if (rle->res != NULL)
2681 panic("resource_list_delete: resource has not been released");
2682 STAILQ_REMOVE(rl, rle, resource_list_entry, link);
2683 free(rle, M_BUS);
2684 }
2685 }
2686
2687 /**
2688 * @brief Helper function for implementing BUS_ALLOC_RESOURCE()
2689 *
2690 * Implement BUS_ALLOC_RESOURCE() by looking up a resource from the list
2691 * and passing the allocation up to the parent of @p bus. This assumes
2692 * that the first entry of @c device_get_ivars(child) is a struct
2693 * resource_list. This also handles 'passthrough' allocations where a
2694 * child is a remote descendant of bus by passing the allocation up to
2695 * the parent of bus.
2696 *
2697 * Typically, a bus driver would store a list of child resources
2698 * somewhere in the child device's ivars (see device_get_ivars()) and
2699 * its implementation of BUS_ALLOC_RESOURCE() would find that list and
2700 * then call resource_list_alloc() to perform the allocation.
2701 *
2702 * @param rl the resource list to allocate from
2703 * @param bus the parent device of @p child
2704 * @param child the device which is requesting an allocation
2705 * @param type the type of resource to allocate
2706 * @param rid a pointer to the resource identifier
2707 * @param start hint at the start of the resource range - pass
2708 * @c 0UL for any start address
2709 * @param end hint at the end of the resource range - pass
2710 * @c ~0UL for any end address
2711 * @param count hint at the size of range required - pass @c 1
2712 * for any size
2713 * @param flags any extra flags to control the resource
2714 * allocation - see @c RF_XXX flags in
2715 * <sys/rman.h> for details
2716 *
2717 * @returns the resource which was allocated or @c NULL if no
2718 * resource could be allocated
2719 */
2720 struct resource *
2721 resource_list_alloc(struct resource_list *rl, device_t bus, device_t child,
2722 int type, int *rid, u_long start, u_long end, u_long count, u_int flags)
2723 {
2724 struct resource_list_entry *rle = NULL;
2725 int passthrough = (device_get_parent(child) != bus);
2726 int isdefault = (start == 0UL && end == ~0UL);
2727
2728 if (passthrough) {
2729 return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
2730 type, rid, start, end, count, flags));
2731 }
2732
2733 rle = resource_list_find(rl, type, *rid);
2734
2735 if (!rle)
2736 return (NULL); /* no resource of that type/rid */
2737
2738 if (rle->res)
2739 panic("resource_list_alloc: resource entry is busy");
2740
2741 if (isdefault) {
2742 start = rle->start;
2743 count = ulmax(count, rle->count);
2744 end = ulmax(rle->end, start + count - 1);
2745 }
2746
2747 rle->res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
2748 type, rid, start, end, count, flags);
2749
2750 /*
2751 * Record the new range.
2752 */
2753 if (rle->res) {
2754 rle->start = rman_get_start(rle->res);
2755 rle->end = rman_get_end(rle->res);
2756 rle->count = count;
2757 }
2758
2759 return (rle->res);
2760 }
2761
2762 /**
2763 * @brief Helper function for implementing BUS_RELEASE_RESOURCE()
2764 *
2765 * Implement BUS_RELEASE_RESOURCE() using a resource list. Normally
2766 * used with resource_list_alloc().
2767 *
2768 * @param rl the resource list which was allocated from
2769 * @param bus the parent device of @p child
2770 * @param child the device which is requesting a release
2771 * @param type the type of resource to allocate
2772 * @param rid the resource identifier
2773 * @param res the resource to release
2774 *
2775 * @retval 0 success
2776 * @retval non-zero a standard unix error code indicating what
2777 * error condition prevented the operation
2778 */
2779 int
2780 resource_list_release(struct resource_list *rl, device_t bus, device_t child,
2781 int type, int rid, struct resource *res)
2782 {
2783 struct resource_list_entry *rle = NULL;
2784 int passthrough = (device_get_parent(child) != bus);
2785 int error;
2786
2787 if (passthrough) {
2788 return (BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
2789 type, rid, res));
2790 }
2791
2792 rle = resource_list_find(rl, type, rid);
2793
2794 if (!rle)
2795 panic("resource_list_release: can't find resource");
2796 if (!rle->res)
2797 panic("resource_list_release: resource entry is not busy");
2798
2799 error = BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
2800 type, rid, res);
2801 if (error)
2802 return (error);
2803
2804 rle->res = NULL;
2805 return (0);
2806 }
2807
2808 /**
2809 * @brief Print a description of resources in a resource list
2810 *
2811 * Print all resources of a specified type, for use in BUS_PRINT_CHILD().
2812 * The name is printed if at least one resource of the given type is available.
2813 * The format is used to print resource start and end.
2814 *
2815 * @param rl the resource list to print
2816 * @param name the name of @p type, e.g. @c "memory"
2817 * @param type type type of resource entry to print
2818 * @param format printf(9) format string to print resource
2819 * start and end values
2820 *
2821 * @returns the number of characters printed
2822 */
2823 int
2824 resource_list_print_type(struct resource_list *rl, const char *name, int type,
2825 const char *format)
2826 {
2827 struct resource_list_entry *rle;
2828 int printed, retval;
2829
2830 printed = 0;
2831 retval = 0;
2832 /* Yes, this is kinda cheating */
2833 STAILQ_FOREACH(rle, rl, link) {
2834 if (rle->type == type) {
2835 if (printed == 0)
2836 retval += printf(" %s ", name);
2837 else
2838 retval += printf(",");
2839 printed++;
2840 retval += printf(format, rle->start);
2841 if (rle->count > 1) {
2842 retval += printf("-");
2843 retval += printf(format, rle->start +
2844 rle->count - 1);
2845 }
2846 }
2847 }
2848 return (retval);
2849 }
2850
2851 /**
2852 * @brief Releases all the resources in a list.
2853 *
2854 * @param rl The resource list to purge.
2855 *
2856 * @returns nothing
2857 */
2858 void
2859 resource_list_purge(struct resource_list *rl)
2860 {
2861 struct resource_list_entry *rle;
2862
2863 while ((rle = STAILQ_FIRST(rl)) != NULL) {
2864 if (rle->res)
2865 bus_release_resource(rman_get_device(rle->res),
2866 rle->type, rle->rid, rle->res);
2867 STAILQ_REMOVE_HEAD(rl, link);
2868 free(rle, M_BUS);
2869 }
2870 }
2871
2872 device_t
2873 bus_generic_add_child(device_t dev, int order, const char *name, int unit)
2874 {
2875
2876 return (device_add_child_ordered(dev, order, name, unit));
2877 }
2878
2879 /**
2880 * @brief Helper function for implementing DEVICE_PROBE()
2881 *
2882 * This function can be used to help implement the DEVICE_PROBE() for
2883 * a bus (i.e. a device which has other devices attached to it). It
2884 * calls the DEVICE_IDENTIFY() method of each driver in the device's
2885 * devclass.
2886 */
2887 int
2888 bus_generic_probe(device_t dev)
2889 {
2890 devclass_t dc = dev->devclass;
2891 driverlink_t dl;
2892
2893 TAILQ_FOREACH(dl, &dc->drivers, link) {
2894 DEVICE_IDENTIFY(dl->driver, dev);
2895 }
2896
2897 return (0);
2898 }
2899
2900 /**
2901 * @brief Helper function for implementing DEVICE_ATTACH()
2902 *
2903 * This function can be used to help implement the DEVICE_ATTACH() for
2904 * a bus. It calls device_probe_and_attach() for each of the device's
2905 * children.
2906 */
2907 int
2908 bus_generic_attach(device_t dev)
2909 {
2910 device_t child;
2911
2912 TAILQ_FOREACH(child, &dev->children, link) {
2913 device_probe_and_attach(child);
2914 }
2915
2916 return (0);
2917 }
2918
2919 /**
2920 * @brief Helper function for implementing DEVICE_DETACH()
2921 *
2922 * This function can be used to help implement the DEVICE_DETACH() for
2923 * a bus. It calls device_detach() for each of the device's
2924 * children.
2925 */
2926 int
2927 bus_generic_detach(device_t dev)
2928 {
2929 device_t child;
2930 int error;
2931
2932 if (dev->state != DS_ATTACHED)
2933 return (EBUSY);
2934
2935 TAILQ_FOREACH(child, &dev->children, link) {
2936 if ((error = device_detach(child)) != 0)
2937 return (error);
2938 }
2939
2940 return (0);
2941 }
2942
2943 /**
2944 * @brief Helper function for implementing DEVICE_SHUTDOWN()
2945 *
2946 * This function can be used to help implement the DEVICE_SHUTDOWN()
2947 * for a bus. It calls device_shutdown() for each of the device's
2948 * children.
2949 */
2950 int
2951 bus_generic_shutdown(device_t dev)
2952 {
2953 device_t child;
2954
2955 TAILQ_FOREACH(child, &dev->children, link) {
2956 device_shutdown(child);
2957 }
2958
2959 return (0);
2960 }
2961
2962 /**
2963 * @brief Helper function for implementing DEVICE_SUSPEND()
2964 *
2965 * This function can be used to help implement the DEVICE_SUSPEND()
2966 * for a bus. It calls DEVICE_SUSPEND() for each of the device's
2967 * children. If any call to DEVICE_SUSPEND() fails, the suspend
2968 * operation is aborted and any devices which were suspended are
2969 * resumed immediately by calling their DEVICE_RESUME() methods.
2970 */
2971 int
2972 bus_generic_suspend(device_t dev)
2973 {
2974 int error;
2975 device_t child, child2;
2976
2977 TAILQ_FOREACH(child, &dev->children, link) {
2978 error = DEVICE_SUSPEND(child);
2979 if (error) {
2980 for (child2 = TAILQ_FIRST(&dev->children);
2981 child2 && child2 != child;
2982 child2 = TAILQ_NEXT(child2, link))
2983 DEVICE_RESUME(child2);
2984 return (error);
2985 }
2986 }
2987 return (0);
2988 }
2989
2990 /**
2991 * @brief Helper function for implementing DEVICE_RESUME()
2992 *
2993 * This function can be used to help implement the DEVICE_RESUME() for
2994 * a bus. It calls DEVICE_RESUME() on each of the device's children.
2995 */
2996 int
2997 bus_generic_resume(device_t dev)
2998 {
2999 device_t child;
3000
3001 TAILQ_FOREACH(child, &dev->children, link) {
3002 DEVICE_RESUME(child);
3003 /* if resume fails, there's nothing we can usefully do... */
3004 }
3005 return (0);
3006 }
3007
3008 /**
3009 * @brief Helper function for implementing BUS_PRINT_CHILD().
3010 *
3011 * This function prints the first part of the ascii representation of
3012 * @p child, including its name, unit and description (if any - see
3013 * device_set_desc()).
3014 *
3015 * @returns the number of characters printed
3016 */
3017 int
3018 bus_print_child_header(device_t dev, device_t child)
3019 {
3020 int retval = 0;
3021
3022 if (device_get_desc(child)) {
3023 retval += device_printf(child, "<%s>", device_get_desc(child));
3024 } else {
3025 retval += printf("%s", device_get_nameunit(child));
3026 }
3027
3028 return (retval);
3029 }
3030
3031 /**
3032 * @brief Helper function for implementing BUS_PRINT_CHILD().
3033 *
3034 * This function prints the last part of the ascii representation of
3035 * @p child, which consists of the string @c " on " followed by the
3036 * name and unit of the @p dev.
3037 *
3038 * @returns the number of characters printed
3039 */
3040 int
3041 bus_print_child_footer(device_t dev, device_t child)
3042 {
3043 return (printf(" on %s\n", device_get_nameunit(dev)));
3044 }
3045
3046 /**
3047 * @brief Helper function for implementing BUS_PRINT_CHILD().
3048 *
3049 * This function simply calls bus_print_child_header() followed by
3050 * bus_print_child_footer().
3051 *
3052 * @returns the number of characters printed
3053 */
3054 int
3055 bus_generic_print_child(device_t dev, device_t child)
3056 {
3057 int retval = 0;
3058
3059 retval += bus_print_child_header(dev, child);
3060 retval += bus_print_child_footer(dev, child);
3061
3062 return (retval);
3063 }
3064
3065 /**
3066 * @brief Stub function for implementing BUS_READ_IVAR().
3067 *
3068 * @returns ENOENT
3069 */
3070 int
3071 bus_generic_read_ivar(device_t dev, device_t child, int index,
3072 uintptr_t * result)
3073 {
3074 return (ENOENT);
3075 }
3076
3077 /**
3078 * @brief Stub function for implementing BUS_WRITE_IVAR().
3079 *
3080 * @returns ENOENT
3081 */
3082 int
3083 bus_generic_write_ivar(device_t dev, device_t child, int index,
3084 uintptr_t value)
3085 {
3086 return (ENOENT);
3087 }
3088
3089 /**
3090 * @brief Stub function for implementing BUS_GET_RESOURCE_LIST().
3091 *
3092 * @returns NULL
3093 */
3094 struct resource_list *
3095 bus_generic_get_resource_list(device_t dev, device_t child)
3096 {
3097 return (NULL);
3098 }
3099
3100 /**
3101 * @brief Helper function for implementing BUS_DRIVER_ADDED().
3102 *
3103 * This implementation of BUS_DRIVER_ADDED() simply calls the driver's
3104 * DEVICE_IDENTIFY() method to allow it to add new children to the bus
3105 * and then calls device_probe_and_attach() for each unattached child.
3106 */
3107 void
3108 bus_generic_driver_added(device_t dev, driver_t *driver)
3109 {
3110 device_t child;
3111
3112 DEVICE_IDENTIFY(driver, dev);
3113 TAILQ_FOREACH(child, &dev->children, link) {
3114 if (child->state == DS_NOTPRESENT ||
3115 (child->flags & DF_REBID))
3116 device_probe_and_attach(child);
3117 }
3118 }
3119
3120 /**
3121 * @brief Helper function for implementing BUS_SETUP_INTR().
3122 *
3123 * This simple implementation of BUS_SETUP_INTR() simply calls the
3124 * BUS_SETUP_INTR() method of the parent of @p dev.
3125 */
3126 int
3127 bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq,
3128 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg,
3129 void **cookiep)
3130 {
3131 /* Propagate up the bus hierarchy until someone handles it. */
3132 if (dev->parent)
3133 return (BUS_SETUP_INTR(dev->parent, child, irq, flags,
3134 filter, intr, arg, cookiep));
3135 return (EINVAL);
3136 }
3137
3138 /**
3139 * @brief Helper function for implementing BUS_TEARDOWN_INTR().
3140 *
3141 * This simple implementation of BUS_TEARDOWN_INTR() simply calls the
3142 * BUS_TEARDOWN_INTR() method of the parent of @p dev.
3143 */
3144 int
3145 bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq,
3146 void *cookie)
3147 {
3148 /* Propagate up the bus hierarchy until someone handles it. */
3149 if (dev->parent)
3150 return (BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie));
3151 return (EINVAL);
3152 }
3153
3154 /**
3155 * @brief Helper function for implementing BUS_ALLOC_RESOURCE().
3156 *
3157 * This simple implementation of BUS_ALLOC_RESOURCE() simply calls the
3158 * BUS_ALLOC_RESOURCE() method of the parent of @p dev.
3159 */
3160 struct resource *
3161 bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid,
3162 u_long start, u_long end, u_long count, u_int flags)
3163 {
3164 /* Propagate up the bus hierarchy until someone handles it. */
3165 if (dev->parent)
3166 return (BUS_ALLOC_RESOURCE(dev->parent, child, type, rid,
3167 start, end, count, flags));
3168 return (NULL);
3169 }
3170
3171 /**
3172 * @brief Helper function for implementing BUS_RELEASE_RESOURCE().
3173 *
3174 * This simple implementation of BUS_RELEASE_RESOURCE() simply calls the
3175 * BUS_RELEASE_RESOURCE() method of the parent of @p dev.
3176 */
3177 int
3178 bus_generic_release_resource(device_t dev, device_t child, int type, int rid,
3179 struct resource *r)
3180 {
3181 /* Propagate up the bus hierarchy until someone handles it. */
3182 if (dev->parent)
3183 return (BUS_RELEASE_RESOURCE(dev->parent, child, type, rid,
3184 r));
3185 return (EINVAL);
3186 }
3187
3188 /**
3189 * @brief Helper function for implementing BUS_ACTIVATE_RESOURCE().
3190 *
3191 * This simple implementation of BUS_ACTIVATE_RESOURCE() simply calls the
3192 * BUS_ACTIVATE_RESOURCE() method of the parent of @p dev.
3193 */
3194 int
3195 bus_generic_activate_resource(device_t dev, device_t child, int type, int rid,
3196 struct resource *r)
3197 {
3198 /* Propagate up the bus hierarchy until someone handles it. */
3199 if (dev->parent)
3200 return (BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid,
3201 r));
3202 return (EINVAL);
3203 }
3204
3205 /**
3206 * @brief Helper function for implementing BUS_DEACTIVATE_RESOURCE().
3207 *
3208 * This simple implementation of BUS_DEACTIVATE_RESOURCE() simply calls the
3209 * BUS_DEACTIVATE_RESOURCE() method of the parent of @p dev.
3210 */
3211 int
3212 bus_generic_deactivate_resource(device_t dev, device_t child, int type,
3213 int rid, struct resource *r)
3214 {
3215 /* Propagate up the bus hierarchy until someone handles it. */
3216 if (dev->parent)
3217 return (BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid,
3218 r));
3219 return (EINVAL);
3220 }
3221
3222 /**
3223 * @brief Helper function for implementing BUS_BIND_INTR().
3224 *
3225 * This simple implementation of BUS_BIND_INTR() simply calls the
3226 * BUS_BIND_INTR() method of the parent of @p dev.
3227 */
3228 int
3229 bus_generic_bind_intr(device_t dev, device_t child, struct resource *irq,
3230 int cpu)
3231 {
3232
3233 /* Propagate up the bus hierarchy until someone handles it. */
3234 if (dev->parent)
3235 return (BUS_BIND_INTR(dev->parent, child, irq, cpu));
3236 return (EINVAL);
3237 }
3238
3239 /**
3240 * @brief Helper function for implementing BUS_CONFIG_INTR().
3241 *
3242 * This simple implementation of BUS_CONFIG_INTR() simply calls the
3243 * BUS_CONFIG_INTR() method of the parent of @p dev.
3244 */
3245 int
3246 bus_generic_config_intr(device_t dev, int irq, enum intr_trigger trig,
3247 enum intr_polarity pol)
3248 {
3249
3250 /* Propagate up the bus hierarchy until someone handles it. */
3251 if (dev->parent)
3252 return (BUS_CONFIG_INTR(dev->parent, irq, trig, pol));
3253 return (EINVAL);
3254 }
3255
3256 /**
3257 * @brief Helper function for implementing BUS_GET_DMA_TAG().
3258 *
3259 * This simple implementation of BUS_GET_DMA_TAG() simply calls the
3260 * BUS_GET_DMA_TAG() method of the parent of @p dev.
3261 */
3262 bus_dma_tag_t
3263 bus_generic_get_dma_tag(device_t dev, device_t child)
3264 {
3265
3266 /* Propagate up the bus hierarchy until someone handles it. */
3267 if (dev->parent != NULL)
3268 return (BUS_GET_DMA_TAG(dev->parent, child));
3269 return (NULL);
3270 }
3271
3272 /**
3273 * @brief Helper function for implementing BUS_GET_RESOURCE().
3274 *
3275 * This implementation of BUS_GET_RESOURCE() uses the
3276 * resource_list_find() function to do most of the work. It calls
3277 * BUS_GET_RESOURCE_LIST() to find a suitable resource list to
3278 * search.
3279 */
3280 int
3281 bus_generic_rl_get_resource(device_t dev, device_t child, int type, int rid,
3282 u_long *startp, u_long *countp)
3283 {
3284 struct resource_list * rl = NULL;
3285 struct resource_list_entry * rle = NULL;
3286
3287 rl = BUS_GET_RESOURCE_LIST(dev, child);
3288 if (!rl)
3289 return (EINVAL);
3290
3291 rle = resource_list_find(rl, type, rid);
3292 if (!rle)
3293 return (ENOENT);
3294
3295 if (startp)
3296 *startp = rle->start;
3297 if (countp)
3298 *countp = rle->count;
3299
3300 return (0);
3301 }
3302
3303 /**
3304 * @brief Helper function for implementing BUS_SET_RESOURCE().
3305 *
3306 * This implementation of BUS_SET_RESOURCE() uses the
3307 * resource_list_add() function to do most of the work. It calls
3308 * BUS_GET_RESOURCE_LIST() to find a suitable resource list to
3309 * edit.
3310 */
3311 int
3312 bus_generic_rl_set_resource(device_t dev, device_t child, int type, int rid,
3313 u_long start, u_long count)
3314 {
3315 struct resource_list * rl = NULL;
3316
3317 rl = BUS_GET_RESOURCE_LIST(dev, child);
3318 if (!rl)
3319 return (EINVAL);
3320
3321 resource_list_add(rl, type, rid, start, (start + count - 1), count);
3322
3323 return (0);
3324 }
3325
3326 /**
3327 * @brief Helper function for implementing BUS_DELETE_RESOURCE().
3328 *
3329 * This implementation of BUS_DELETE_RESOURCE() uses the
3330 * resource_list_delete() function to do most of the work. It calls
3331 * BUS_GET_RESOURCE_LIST() to find a suitable resource list to
3332 * edit.
3333 */
3334 void
3335 bus_generic_rl_delete_resource(device_t dev, device_t child, int type, int rid)
3336 {
3337 struct resource_list * rl = NULL;
3338
3339 rl = BUS_GET_RESOURCE_LIST(dev, child);
3340 if (!rl)
3341 return;
3342
3343 resource_list_delete(rl, type, rid);
3344
3345 return;
3346 }
3347
3348 /**
3349 * @brief Helper function for implementing BUS_RELEASE_RESOURCE().
3350 *
3351 * This implementation of BUS_RELEASE_RESOURCE() uses the
3352 * resource_list_release() function to do most of the work. It calls
3353 * BUS_GET_RESOURCE_LIST() to find a suitable resource list.
3354 */
3355 int
3356 bus_generic_rl_release_resource(device_t dev, device_t child, int type,
3357 int rid, struct resource *r)
3358 {
3359 struct resource_list * rl = NULL;
3360
3361 rl = BUS_GET_RESOURCE_LIST(dev, child);
3362 if (!rl)
3363 return (EINVAL);
3364
3365 return (resource_list_release(rl, dev, child, type, rid, r));
3366 }
3367
3368 /**
3369 * @brief Helper function for implementing BUS_ALLOC_RESOURCE().
3370 *
3371 * This implementation of BUS_ALLOC_RESOURCE() uses the
3372 * resource_list_alloc() function to do most of the work. It calls
3373 * BUS_GET_RESOURCE_LIST() to find a suitable resource list.
3374 */
3375 struct resource *
3376 bus_generic_rl_alloc_resource(device_t dev, device_t child, int type,
3377 int *rid, u_long start, u_long end, u_long count, u_int flags)
3378 {
3379 struct resource_list * rl = NULL;
3380
3381 rl = BUS_GET_RESOURCE_LIST(dev, child);
3382 if (!rl)
3383 return (NULL);
3384
3385 return (resource_list_alloc(rl, dev, child, type, rid,
3386 start, end, count, flags));
3387 }
3388
3389 /**
3390 * @brief Helper function for implementing BUS_CHILD_PRESENT().
3391 *
3392 * This simple implementation of BUS_CHILD_PRESENT() simply calls the
3393 * BUS_CHILD_PRESENT() method of the parent of @p dev.
3394 */
3395 int
3396 bus_generic_child_present(device_t dev, device_t child)
3397 {
3398 return (BUS_CHILD_PRESENT(device_get_parent(dev), dev));
3399 }
3400
3401 /*
3402 * Some convenience functions to make it easier for drivers to use the
3403 * resource-management functions. All these really do is hide the
3404 * indirection through the parent's method table, making for slightly
3405 * less-wordy code. In the future, it might make sense for this code
3406 * to maintain some sort of a list of resources allocated by each device.
3407 */
3408
3409 int
3410 bus_alloc_resources(device_t dev, struct resource_spec *rs,
3411 struct resource **res)
3412 {
3413 int i;
3414
3415 for (i = 0; rs[i].type != -1; i++)
3416 res[i] = NULL;
3417 for (i = 0; rs[i].type != -1; i++) {
3418 res[i] = bus_alloc_resource_any(dev,
3419 rs[i].type, &rs[i].rid, rs[i].flags);
3420 if (res[i] == NULL && !(rs[i].flags & RF_OPTIONAL)) {
3421 bus_release_resources(dev, rs, res);
3422 return (ENXIO);
3423 }
3424 }
3425 return (0);
3426 }
3427
3428 void
3429 bus_release_resources(device_t dev, const struct resource_spec *rs,
3430 struct resource **res)
3431 {
3432 int i;
3433
3434 for (i = 0; rs[i].type != -1; i++)
3435 if (res[i] != NULL) {
3436 bus_release_resource(
3437 dev, rs[i].type, rs[i].rid, res[i]);
3438 res[i] = NULL;
3439 }
3440 }
3441
3442 /**
3443 * @brief Wrapper function for BUS_ALLOC_RESOURCE().
3444 *
3445 * This function simply calls the BUS_ALLOC_RESOURCE() method of the
3446 * parent of @p dev.
3447 */
3448 struct resource *
3449 bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end,
3450 u_long count, u_int flags)
3451 {
3452 if (dev->parent == NULL)
3453 return (NULL);
3454 return (BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end,
3455 count, flags));
3456 }
3457
3458 /**
3459 * @brief Wrapper function for BUS_ACTIVATE_RESOURCE().
3460 *
3461 * This function simply calls the BUS_ACTIVATE_RESOURCE() method of the
3462 * parent of @p dev.
3463 */
3464 int
3465 bus_activate_resource(device_t dev, int type, int rid, struct resource *r)
3466 {
3467 if (dev->parent == NULL)
3468 return (EINVAL);
3469 return (BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
3470 }
3471
3472 /**
3473 * @brief Wrapper function for BUS_DEACTIVATE_RESOURCE().
3474 *
3475 * This function simply calls the BUS_DEACTIVATE_RESOURCE() method of the
3476 * parent of @p dev.
3477 */
3478 int
3479 bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r)
3480 {
3481 if (dev->parent == NULL)
3482 return (EINVAL);
3483 return (BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
3484 }
3485
3486 /**
3487 * @brief Wrapper function for BUS_RELEASE_RESOURCE().
3488 *
3489 * This function simply calls the BUS_RELEASE_RESOURCE() method of the
3490 * parent of @p dev.
3491 */
3492 int
3493 bus_release_resource(device_t dev, int type, int rid, struct resource *r)
3494 {
3495 if (dev->parent == NULL)
3496 return (EINVAL);
3497 return (BUS_RELEASE_RESOURCE(dev->parent, dev, type, rid, r));
3498 }
3499
3500 /**
3501 * @brief Wrapper function for BUS_SETUP_INTR().
3502 *
3503 * This function simply calls the BUS_SETUP_INTR() method of the
3504 * parent of @p dev.
3505 */
3506 int
3507 bus_setup_intr(device_t dev, struct resource *r, int flags,
3508 driver_filter_t filter, driver_intr_t handler, void *arg, void **cookiep)
3509 {
3510 int error;
3511
3512 if (dev->parent != NULL) {
3513 error = BUS_SETUP_INTR(dev->parent, dev, r, flags,
3514 filter, handler, arg, cookiep);
3515 if (error == 0) {
3516 if (handler != NULL && !(flags & INTR_MPSAFE))
3517 device_printf(dev, "[GIANT-LOCKED]\n");
3518 if (bootverbose && (flags & INTR_MPSAFE))
3519 device_printf(dev, "[MPSAFE]\n");
3520 if (filter != NULL) {
3521 if (handler == NULL)
3522 device_printf(dev, "[FILTER]\n");
3523 else
3524 device_printf(dev, "[FILTER+ITHREAD]\n");
3525 } else
3526 device_printf(dev, "[ITHREAD]\n");
3527 }
3528 } else
3529 error = EINVAL;
3530 return (error);
3531 }
3532
3533 /**
3534 * @brief Wrapper function for BUS_TEARDOWN_INTR().
3535 *
3536 * This function simply calls the BUS_TEARDOWN_INTR() method of the
3537 * parent of @p dev.
3538 */
3539 int
3540 bus_teardown_intr(device_t dev, struct resource *r, void *cookie)
3541 {
3542 if (dev->parent == NULL)
3543 return (EINVAL);
3544 return (BUS_TEARDOWN_INTR(dev->parent, dev, r, cookie));
3545 }
3546
3547 /**
3548 * @brief Wrapper function for BUS_BIND_INTR().
3549 *
3550 * This function simply calls the BUS_BIND_INTR() method of the
3551 * parent of @p dev.
3552 */
3553 int
3554 bus_bind_intr(device_t dev, struct resource *r, int cpu)
3555 {
3556 if (dev->parent == NULL)
3557 return (EINVAL);
3558 return (BUS_BIND_INTR(dev->parent, dev, r, cpu));
3559 }
3560
3561 /**
3562 * @brief Wrapper function for BUS_SET_RESOURCE().
3563 *
3564 * This function simply calls the BUS_SET_RESOURCE() method of the
3565 * parent of @p dev.
3566 */
3567 int
3568 bus_set_resource(device_t dev, int type, int rid,
3569 u_long start, u_long count)
3570 {
3571 return (BUS_SET_RESOURCE(device_get_parent(dev), dev, type, rid,
3572 start, count));
3573 }
3574
3575 /**
3576 * @brief Wrapper function for BUS_GET_RESOURCE().
3577 *
3578 * This function simply calls the BUS_GET_RESOURCE() method of the
3579 * parent of @p dev.
3580 */
3581 int
3582 bus_get_resource(device_t dev, int type, int rid,
3583 u_long *startp, u_long *countp)
3584 {
3585 return (BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
3586 startp, countp));
3587 }
3588
3589 /**
3590 * @brief Wrapper function for BUS_GET_RESOURCE().
3591 *
3592 * This function simply calls the BUS_GET_RESOURCE() method of the
3593 * parent of @p dev and returns the start value.
3594 */
3595 u_long
3596 bus_get_resource_start(device_t dev, int type, int rid)
3597 {
3598 u_long start, count;
3599 int error;
3600
3601 error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
3602 &start, &count);
3603 if (error)
3604 return (0);
3605 return (start);
3606 }
3607
3608 /**
3609 * @brief Wrapper function for BUS_GET_RESOURCE().
3610 *
3611 * This function simply calls the BUS_GET_RESOURCE() method of the
3612 * parent of @p dev and returns the count value.
3613 */
3614 u_long
3615 bus_get_resource_count(device_t dev, int type, int rid)
3616 {
3617 u_long start, count;
3618 int error;
3619
3620 error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
3621 &start, &count);
3622 if (error)
3623 return (0);
3624 return (count);
3625 }
3626
3627 /**
3628 * @brief Wrapper function for BUS_DELETE_RESOURCE().
3629 *
3630 * This function simply calls the BUS_DELETE_RESOURCE() method of the
3631 * parent of @p dev.
3632 */
3633 void
3634 bus_delete_resource(device_t dev, int type, int rid)
3635 {
3636 BUS_DELETE_RESOURCE(device_get_parent(dev), dev, type, rid);
3637 }
3638
3639 /**
3640 * @brief Wrapper function for BUS_CHILD_PRESENT().
3641 *
3642 * This function simply calls the BUS_CHILD_PRESENT() method of the
3643 * parent of @p dev.
3644 */
3645 int
3646 bus_child_present(device_t child)
3647 {
3648 return (BUS_CHILD_PRESENT(device_get_parent(child), child));
3649 }
3650
3651 /**
3652 * @brief Wrapper function for BUS_CHILD_PNPINFO_STR().
3653 *
3654 * This function simply calls the BUS_CHILD_PNPINFO_STR() method of the
3655 * parent of @p dev.
3656 */
3657 int
3658 bus_child_pnpinfo_str(device_t child, char *buf, size_t buflen)
3659 {
3660 device_t parent;
3661
3662 parent = device_get_parent(child);
3663 if (parent == NULL) {
3664 *buf = '\0';
3665 return (0);
3666 }
3667 return (BUS_CHILD_PNPINFO_STR(parent, child, buf, buflen));
3668 }
3669
3670 /**
3671 * @brief Wrapper function for BUS_CHILD_LOCATION_STR().
3672 *
3673 * This function simply calls the BUS_CHILD_LOCATION_STR() method of the
3674 * parent of @p dev.
3675 */
3676 int
3677 bus_child_location_str(device_t child, char *buf, size_t buflen)
3678 {
3679 device_t parent;
3680
3681 parent = device_get_parent(child);
3682 if (parent == NULL) {
3683 *buf = '\0';
3684 return (0);
3685 }
3686 return (BUS_CHILD_LOCATION_STR(parent, child, buf, buflen));
3687 }
3688
3689 /**
3690 * @brief Wrapper function for BUS_GET_DMA_TAG().
3691 *
3692 * This function simply calls the BUS_GET_DMA_TAG() method of the
3693 * parent of @p dev.
3694 */
3695 bus_dma_tag_t
3696 bus_get_dma_tag(device_t dev)
3697 {
3698 device_t parent;
3699
3700 parent = device_get_parent(dev);
3701 if (parent == NULL)
3702 return (NULL);
3703 return (BUS_GET_DMA_TAG(parent, dev));
3704 }
3705
3706 /* Resume all devices and then notify userland that we're up again. */
3707 static int
3708 root_resume(device_t dev)
3709 {
3710 int error;
3711
3712 error = bus_generic_resume(dev);
3713 if (error == 0)
3714 devctl_notify("kern", "power", "resume", NULL);
3715 return (error);
3716 }
3717
3718 static int
3719 root_print_child(device_t dev, device_t child)
3720 {
3721 int retval = 0;
3722
3723 retval += bus_print_child_header(dev, child);
3724 retval += printf("\n");
3725
3726 return (retval);
3727 }
3728
3729 static int
3730 root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg,
3731 void **cookiep)
3732 {
3733 /*
3734 * If an interrupt mapping gets to here something bad has happened.
3735 */
3736 panic("root_setup_intr");
3737 }
3738
3739 /*
3740 * If we get here, assume that the device is permanant and really is
3741 * present in the system. Removable bus drivers are expected to intercept
3742 * this call long before it gets here. We return -1 so that drivers that
3743 * really care can check vs -1 or some ERRNO returned higher in the food
3744 * chain.
3745 */
3746 static int
3747 root_child_present(device_t dev, device_t child)
3748 {
3749 return (-1);
3750 }
3751
3752 static kobj_method_t root_methods[] = {
3753 /* Device interface */
3754 KOBJMETHOD(device_shutdown, bus_generic_shutdown),
3755 KOBJMETHOD(device_suspend, bus_generic_suspend),
3756 KOBJMETHOD(device_resume, root_resume),
3757
3758 /* Bus interface */
3759 KOBJMETHOD(bus_print_child, root_print_child),
3760 KOBJMETHOD(bus_read_ivar, bus_generic_read_ivar),
3761 KOBJMETHOD(bus_write_ivar, bus_generic_write_ivar),
3762 KOBJMETHOD(bus_setup_intr, root_setup_intr),
3763 KOBJMETHOD(bus_child_present, root_child_present),
3764
3765 { 0, 0 }
3766 };
3767
3768 static driver_t root_driver = {
3769 "root",
3770 root_methods,
3771 1, /* no softc */
3772 };
3773
3774 device_t root_bus;
3775 devclass_t root_devclass;
3776
3777 static int
3778 root_bus_module_handler(module_t mod, int what, void* arg)
3779 {
3780 switch (what) {
3781 case MOD_LOAD:
3782 TAILQ_INIT(&bus_data_devices);
3783 kobj_class_compile((kobj_class_t) &root_driver);
3784 root_bus = make_device(NULL, "root", 0);
3785 root_bus->desc = "System root bus";
3786 kobj_init((kobj_t) root_bus, (kobj_class_t) &root_driver);
3787 root_bus->driver = &root_driver;
3788 root_bus->state = DS_ATTACHED;
3789 root_devclass = devclass_find_internal("root", NULL, FALSE);
3790 devinit();
3791 return (0);
3792
3793 case MOD_SHUTDOWN:
3794 device_shutdown(root_bus);
3795 return (0);
3796 default:
3797 return (EOPNOTSUPP);
3798 }
3799
3800 return (0);
3801 }
3802
3803 static moduledata_t root_bus_mod = {
3804 "rootbus",
3805 root_bus_module_handler,
3806 0
3807 };
3808 DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
3809
3810 /**
3811 * @brief Automatically configure devices
3812 *
3813 * This function begins the autoconfiguration process by calling
3814 * device_probe_and_attach() for each child of the @c root0 device.
3815 */
3816 void
3817 root_bus_configure(void)
3818 {
3819 device_t dev;
3820
3821 PDEBUG(("."));
3822
3823 TAILQ_FOREACH(dev, &root_bus->children, link) {
3824 device_probe_and_attach(dev);
3825 }
3826 }
3827
3828 /**
3829 * @brief Module handler for registering device drivers
3830 *
3831 * This module handler is used to automatically register device
3832 * drivers when modules are loaded. If @p what is MOD_LOAD, it calls
3833 * devclass_add_driver() for the driver described by the
3834 * driver_module_data structure pointed to by @p arg
3835 */
3836 int
3837 driver_module_handler(module_t mod, int what, void *arg)
3838 {
3839 int error;
3840 struct driver_module_data *dmd;
3841 devclass_t bus_devclass;
3842 kobj_class_t driver;
3843
3844 dmd = (struct driver_module_data *)arg;
3845 bus_devclass = devclass_find_internal(dmd->dmd_busname, NULL, TRUE);
3846 error = 0;
3847
3848 switch (what) {
3849 case MOD_LOAD:
3850 if (dmd->dmd_chainevh)
3851 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3852
3853 driver = dmd->dmd_driver;
3854 PDEBUG(("Loading module: driver %s on bus %s",
3855 DRIVERNAME(driver), dmd->dmd_busname));
3856 error = devclass_add_driver(bus_devclass, driver);
3857 if (error)
3858 break;
3859
3860 /*
3861 * If the driver has any base classes, make the
3862 * devclass inherit from the devclass of the driver's
3863 * first base class. This will allow the system to
3864 * search for drivers in both devclasses for children
3865 * of a device using this driver.
3866 */
3867 if (driver->baseclasses) {
3868 const char *parentname;
3869 parentname = driver->baseclasses[0]->name;
3870 *dmd->dmd_devclass =
3871 devclass_find_internal(driver->name,
3872 parentname, TRUE);
3873 } else {
3874 *dmd->dmd_devclass =
3875 devclass_find_internal(driver->name, NULL, TRUE);
3876 }
3877 break;
3878
3879 case MOD_UNLOAD:
3880 PDEBUG(("Unloading module: driver %s from bus %s",
3881 DRIVERNAME(dmd->dmd_driver),
3882 dmd->dmd_busname));
3883 error = devclass_delete_driver(bus_devclass,
3884 dmd->dmd_driver);
3885
3886 if (!error && dmd->dmd_chainevh)
3887 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3888 break;
3889 case MOD_QUIESCE:
3890 PDEBUG(("Quiesce module: driver %s from bus %s",
3891 DRIVERNAME(dmd->dmd_driver),
3892 dmd->dmd_busname));
3893 error = devclass_quiesce_driver(bus_devclass,
3894 dmd->dmd_driver);
3895
3896 if (!error && dmd->dmd_chainevh)
3897 error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
3898 break;
3899 default:
3900 error = EOPNOTSUPP;
3901 break;
3902 }
3903
3904 return (error);
3905 }
3906
3907 /**
3908 * @brief Enumerate all hinted devices for this bus.
3909 *
3910 * Walks through the hints for this bus and calls the bus_hinted_child
3911 * routine for each one it fines. It searches first for the specific
3912 * bus that's being probed for hinted children (eg isa0), and then for
3913 * generic children (eg isa).
3914 *
3915 * @param dev bus device to enumerate
3916 */
3917 void
3918 bus_enumerate_hinted_children(device_t bus)
3919 {
3920 int i;
3921 const char *dname, *busname;
3922 int dunit;
3923
3924 /*
3925 * enumerate all devices on the specific bus
3926 */
3927 busname = device_get_nameunit(bus);
3928 i = 0;
3929 while (resource_find_match(&i, &dname, &dunit, "at", busname) == 0)
3930 BUS_HINTED_CHILD(bus, dname, dunit);
3931
3932 /*
3933 * and all the generic ones.
3934 */
3935 busname = device_get_name(bus);
3936 i = 0;
3937 while (resource_find_match(&i, &dname, &dunit, "at", busname) == 0)
3938 BUS_HINTED_CHILD(bus, dname, dunit);
3939 }
3940
3941 #ifdef BUS_DEBUG
3942
3943 /* the _short versions avoid iteration by not calling anything that prints
3944 * more than oneliners. I love oneliners.
3945 */
3946
3947 static void
3948 print_device_short(device_t dev, int indent)
3949 {
3950 if (!dev)
3951 return;
3952
3953 indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%s%s,%sivars,%ssoftc,busy=%d\n",
3954 dev->unit, dev->desc,
3955 (dev->parent? "":"no "),
3956 (TAILQ_EMPTY(&dev->children)? "no ":""),
3957 (dev->flags&DF_ENABLED? "enabled,":"disabled,"),
3958 (dev->flags&DF_FIXEDCLASS? "fixed,":""),
3959 (dev->flags&DF_WILDCARD? "wildcard,":""),
3960 (dev->flags&DF_DESCMALLOCED? "descmalloced,":""),
3961 (dev->flags&DF_REBID? "rebiddable,":""),
3962 (dev->ivars? "":"no "),
3963 (dev->softc? "":"no "),
3964 dev->busy));
3965 }
3966
3967 static void
3968 print_device(device_t dev, int indent)
3969 {
3970 if (!dev)
3971 return;
3972
3973 print_device_short(dev, indent);
3974
3975 indentprintf(("Parent:\n"));
3976 print_device_short(dev->parent, indent+1);
3977 indentprintf(("Driver:\n"));
3978 print_driver_short(dev->driver, indent+1);
3979 indentprintf(("Devclass:\n"));
3980 print_devclass_short(dev->devclass, indent+1);
3981 }
3982
3983 void
3984 print_device_tree_short(device_t dev, int indent)
3985 /* print the device and all its children (indented) */
3986 {
3987 device_t child;
3988
3989 if (!dev)
3990 return;
3991
3992 print_device_short(dev, indent);
3993
3994 TAILQ_FOREACH(child, &dev->children, link) {
3995 print_device_tree_short(child, indent+1);
3996 }
3997 }
3998
3999 void
4000 print_device_tree(device_t dev, int indent)
4001 /* print the device and all its children (indented) */
4002 {
4003 device_t child;
4004
4005 if (!dev)
4006 return;
4007
4008 print_device(dev, indent);
4009
4010 TAILQ_FOREACH(child, &dev->children, link) {
4011 print_device_tree(child, indent+1);
4012 }
4013 }
4014
4015 static void
4016 print_driver_short(driver_t *driver, int indent)
4017 {
4018 if (!driver)
4019 return;
4020
4021 indentprintf(("driver %s: softc size = %zd\n",
4022 driver->name, driver->size));
4023 }
4024
4025 static void
4026 print_driver(driver_t *driver, int indent)
4027 {
4028 if (!driver)
4029 return;
4030
4031 print_driver_short(driver, indent);
4032 }
4033
4034
4035 static void
4036 print_driver_list(driver_list_t drivers, int indent)
4037 {
4038 driverlink_t driver;
4039
4040 TAILQ_FOREACH(driver, &drivers, link) {
4041 print_driver(driver->driver, indent);
4042 }
4043 }
4044
4045 static void
4046 print_devclass_short(devclass_t dc, int indent)
4047 {
4048 if ( !dc )
4049 return;
4050
4051 indentprintf(("devclass %s: max units = %d\n", dc->name, dc->maxunit));
4052 }
4053
4054 static void
4055 print_devclass(devclass_t dc, int indent)
4056 {
4057 int i;
4058
4059 if ( !dc )
4060 return;
4061
4062 print_devclass_short(dc, indent);
4063 indentprintf(("Drivers:\n"));
4064 print_driver_list(dc->drivers, indent+1);
4065
4066 indentprintf(("Devices:\n"));
4067 for (i = 0; i < dc->maxunit; i++)
4068 if (dc->devices[i])
4069 print_device(dc->devices[i], indent+1);
4070 }
4071
4072 void
4073 print_devclass_list_short(void)
4074 {
4075 devclass_t dc;
4076
4077 printf("Short listing of devclasses, drivers & devices:\n");
4078 TAILQ_FOREACH(dc, &devclasses, link) {
4079 print_devclass_short(dc, 0);
4080 }
4081 }
4082
4083 void
4084 print_devclass_list(void)
4085 {
4086 devclass_t dc;
4087
4088 printf("Full listing of devclasses, drivers & devices:\n");
4089 TAILQ_FOREACH(dc, &devclasses, link) {
4090 print_devclass(dc, 0);
4091 }
4092 }
4093
4094 #endif
4095
4096 /*
4097 * User-space access to the device tree.
4098 *
4099 * We implement a small set of nodes:
4100 *
4101 * hw.bus Single integer read method to obtain the
4102 * current generation count.
4103 * hw.bus.devices Reads the entire device tree in flat space.
4104 * hw.bus.rman Resource manager interface
4105 *
4106 * We might like to add the ability to scan devclasses and/or drivers to
4107 * determine what else is currently loaded/available.
4108 */
4109
4110 static int
4111 sysctl_bus(SYSCTL_HANDLER_ARGS)
4112 {
4113 struct u_businfo ubus;
4114
4115 ubus.ub_version = BUS_USER_VERSION;
4116 ubus.ub_generation = bus_data_generation;
4117
4118 return (SYSCTL_OUT(req, &ubus, sizeof(ubus)));
4119 }
4120 SYSCTL_NODE(_hw_bus, OID_AUTO, info, CTLFLAG_RW, sysctl_bus,
4121 "bus-related data");
4122
4123 static int
4124 sysctl_devices(SYSCTL_HANDLER_ARGS)
4125 {
4126 int *name = (int *)arg1;
4127 u_int namelen = arg2;
4128 int index;
4129 struct device *dev;
4130 struct u_device udev; /* XXX this is a bit big */
4131 int error;
4132
4133 if (namelen != 2)
4134 return (EINVAL);
4135
4136 if (bus_data_generation_check(name[0]))
4137 return (EINVAL);
4138
4139 index = name[1];
4140
4141 /*
4142 * Scan the list of devices, looking for the requested index.
4143 */
4144 TAILQ_FOREACH(dev, &bus_data_devices, devlink) {
4145 if (index-- == 0)
4146 break;
4147 }
4148 if (dev == NULL)
4149 return (ENOENT);
4150
4151 /*
4152 * Populate the return array.
4153 */
4154 bzero(&udev, sizeof(udev));
4155 udev.dv_handle = (uintptr_t)dev;
4156 udev.dv_parent = (uintptr_t)dev->parent;
4157 if (dev->nameunit != NULL)
4158 strlcpy(udev.dv_name, dev->nameunit, sizeof(udev.dv_name));
4159 if (dev->desc != NULL)
4160 strlcpy(udev.dv_desc, dev->desc, sizeof(udev.dv_desc));
4161 if (dev->driver != NULL && dev->driver->name != NULL)
4162 strlcpy(udev.dv_drivername, dev->driver->name,
4163 sizeof(udev.dv_drivername));
4164 bus_child_pnpinfo_str(dev, udev.dv_pnpinfo, sizeof(udev.dv_pnpinfo));
4165 bus_child_location_str(dev, udev.dv_location, sizeof(udev.dv_location));
4166 udev.dv_devflags = dev->devflags;
4167 udev.dv_flags = dev->flags;
4168 udev.dv_state = dev->state;
4169 error = SYSCTL_OUT(req, &udev, sizeof(udev));
4170 return (error);
4171 }
4172
4173 SYSCTL_NODE(_hw_bus, OID_AUTO, devices, CTLFLAG_RD, sysctl_devices,
4174 "system device tree");
4175
4176 int
4177 bus_data_generation_check(int generation)
4178 {
4179 if (generation != bus_data_generation)
4180 return (1);
4181
4182 /* XXX generate optimised lists here? */
4183 return (0);
4184 }
4185
4186 void
4187 bus_data_generation_update(void)
4188 {
4189 bus_data_generation++;
4190 }
4191
4192 int
4193 bus_free_resource(device_t dev, int type, struct resource *r)
4194 {
4195 if (r == NULL)
4196 return (0);
4197 return (bus_release_resource(dev, type, rman_get_rid(r), r));
4198 }
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