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subr_autoconf.c
3763 lines (3217 loc) · 89.2 KB
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subr_autoconf.c
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/* $NetBSD: subr_autoconf.c,v 1.307 2023/02/22 17:00:16 riastradh Exp $ */
/*
* Copyright (c) 1996, 2000 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the
* NetBSD Project. See http://www.NetBSD.org/ for
* information about NetBSD.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )--
*/
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratories.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL)
*
* @(#)subr_autoconf.c 8.3 (Berkeley) 5/17/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.307 2023/02/22 17:00:16 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_ddb.h"
#include "drvctl.h"
#endif
#include <sys/param.h>
#include <sys/device.h>
#include <sys/device_impl.h>
#include <sys/disklabel.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/kthread.h>
#include <sys/buf.h>
#include <sys/dirent.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/unistd.h>
#include <sys/fcntl.h>
#include <sys/lockf.h>
#include <sys/callout.h>
#include <sys/devmon.h>
#include <sys/cpu.h>
#include <sys/sysctl.h>
#include <sys/stdarg.h>
#include <sys/localcount.h>
#include <sys/disk.h>
#include <sys/rndsource.h>
#include <machine/limits.h>
/*
* Autoconfiguration subroutines.
*/
/*
* Device autoconfiguration timings are mixed into the entropy pool.
*/
static krndsource_t rnd_autoconf_source;
/*
* ioconf.c exports exactly two names: cfdata and cfroots. All system
* devices and drivers are found via these tables.
*/
extern struct cfdata cfdata[];
extern const short cfroots[];
/*
* List of all cfdriver structures. We use this to detect duplicates
* when other cfdrivers are loaded.
*/
struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers);
extern struct cfdriver * const cfdriver_list_initial[];
/*
* Initial list of cfattach's.
*/
extern const struct cfattachinit cfattachinit[];
/*
* List of cfdata tables. We always have one such list -- the one
* built statically when the kernel was configured.
*/
struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables);
static struct cftable initcftable;
#define ROOT ((device_t)NULL)
struct matchinfo {
cfsubmatch_t fn;
device_t parent;
const int *locs;
void *aux;
struct cfdata *match;
int pri;
};
struct alldevs_foray {
int af_s;
struct devicelist af_garbage;
};
/*
* Internal version of the cfargs structure; all versions are
* canonicalized to this.
*/
struct cfargs_internal {
union {
cfsubmatch_t submatch;/* submatch function (direct config) */
cfsearch_t search; /* search function (indirect config) */
};
const char * iattr; /* interface attribute */
const int * locators; /* locators array */
devhandle_t devhandle; /* devhandle_t (by value) */
};
static char *number(char *, int);
static void mapply(struct matchinfo *, cfdata_t);
static void config_devdelete(device_t);
static void config_devunlink(device_t, struct devicelist *);
static void config_makeroom(int, struct cfdriver *);
static void config_devlink(device_t);
static void config_alldevs_enter(struct alldevs_foray *);
static void config_alldevs_exit(struct alldevs_foray *);
static void config_add_attrib_dict(device_t);
static device_t config_attach_internal(device_t, cfdata_t, void *,
cfprint_t, const struct cfargs_internal *);
static void config_collect_garbage(struct devicelist *);
static void config_dump_garbage(struct devicelist *);
static void pmflock_debug(device_t, const char *, int);
static device_t deviter_next1(deviter_t *);
static void deviter_reinit(deviter_t *);
struct deferred_config {
TAILQ_ENTRY(deferred_config) dc_queue;
device_t dc_dev;
void (*dc_func)(device_t);
};
TAILQ_HEAD(deferred_config_head, deferred_config);
static struct deferred_config_head deferred_config_queue =
TAILQ_HEAD_INITIALIZER(deferred_config_queue);
static struct deferred_config_head interrupt_config_queue =
TAILQ_HEAD_INITIALIZER(interrupt_config_queue);
static int interrupt_config_threads = 8;
static struct deferred_config_head mountroot_config_queue =
TAILQ_HEAD_INITIALIZER(mountroot_config_queue);
static int mountroot_config_threads = 2;
static lwp_t **mountroot_config_lwpids;
static size_t mountroot_config_lwpids_size;
bool root_is_mounted = false;
static void config_process_deferred(struct deferred_config_head *, device_t);
/* Hooks to finalize configuration once all real devices have been found. */
struct finalize_hook {
TAILQ_ENTRY(finalize_hook) f_list;
int (*f_func)(device_t);
device_t f_dev;
};
static TAILQ_HEAD(, finalize_hook) config_finalize_list =
TAILQ_HEAD_INITIALIZER(config_finalize_list);
static int config_finalize_done;
/* list of all devices */
static struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs);
static kmutex_t alldevs_lock __cacheline_aligned;
static devgen_t alldevs_gen = 1;
static int alldevs_nread = 0;
static int alldevs_nwrite = 0;
static bool alldevs_garbage = false;
static struct devicelist config_pending =
TAILQ_HEAD_INITIALIZER(config_pending);
static kmutex_t config_misc_lock;
static kcondvar_t config_misc_cv;
static bool detachall = false;
#define STREQ(s1, s2) \
(*(s1) == *(s2) && strcmp((s1), (s2)) == 0)
static bool config_initialized = false; /* config_init() has been called. */
static int config_do_twiddle;
static callout_t config_twiddle_ch;
static void sysctl_detach_setup(struct sysctllog **);
int no_devmon_insert(const char *, prop_dictionary_t);
int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert;
typedef int (*cfdriver_fn)(struct cfdriver *);
static int
frob_cfdrivervec(struct cfdriver * const *cfdriverv,
cfdriver_fn drv_do, cfdriver_fn drv_undo,
const char *style, bool dopanic)
{
void (*pr)(const char *, ...) __printflike(1, 2) =
dopanic ? panic : printf;
int i, error = 0, e2 __diagused;
for (i = 0; cfdriverv[i] != NULL; i++) {
if ((error = drv_do(cfdriverv[i])) != 0) {
pr("configure: `%s' driver %s failed: %d",
cfdriverv[i]->cd_name, style, error);
goto bad;
}
}
KASSERT(error == 0);
return 0;
bad:
printf("\n");
for (i--; i >= 0; i--) {
e2 = drv_undo(cfdriverv[i]);
KASSERT(e2 == 0);
}
return error;
}
typedef int (*cfattach_fn)(const char *, struct cfattach *);
static int
frob_cfattachvec(const struct cfattachinit *cfattachv,
cfattach_fn att_do, cfattach_fn att_undo,
const char *style, bool dopanic)
{
const struct cfattachinit *cfai = NULL;
void (*pr)(const char *, ...) __printflike(1, 2) =
dopanic ? panic : printf;
int j = 0, error = 0, e2 __diagused;
for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) {
for (j = 0; cfai->cfai_list[j] != NULL; j++) {
if ((error = att_do(cfai->cfai_name,
cfai->cfai_list[j])) != 0) {
pr("configure: attachment `%s' "
"of `%s' driver %s failed: %d",
cfai->cfai_list[j]->ca_name,
cfai->cfai_name, style, error);
goto bad;
}
}
}
KASSERT(error == 0);
return 0;
bad:
/*
* Rollback in reverse order. dunno if super-important, but
* do that anyway. Although the code looks a little like
* someone did a little integration (in the math sense).
*/
printf("\n");
if (cfai) {
bool last;
for (last = false; last == false; ) {
if (cfai == &cfattachv[0])
last = true;
for (j--; j >= 0; j--) {
e2 = att_undo(cfai->cfai_name,
cfai->cfai_list[j]);
KASSERT(e2 == 0);
}
if (!last) {
cfai--;
for (j = 0; cfai->cfai_list[j] != NULL; j++)
;
}
}
}
return error;
}
/*
* Initialize the autoconfiguration data structures. Normally this
* is done by configure(), but some platforms need to do this very
* early (to e.g. initialize the console).
*/
void
config_init(void)
{
KASSERT(config_initialized == false);
mutex_init(&alldevs_lock, MUTEX_DEFAULT, IPL_VM);
mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE);
cv_init(&config_misc_cv, "cfgmisc");
callout_init(&config_twiddle_ch, CALLOUT_MPSAFE);
frob_cfdrivervec(cfdriver_list_initial,
config_cfdriver_attach, NULL, "bootstrap", true);
frob_cfattachvec(cfattachinit,
config_cfattach_attach, NULL, "bootstrap", true);
initcftable.ct_cfdata = cfdata;
TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list);
rnd_attach_source(&rnd_autoconf_source, "autoconf", RND_TYPE_UNKNOWN,
RND_FLAG_COLLECT_TIME);
config_initialized = true;
}
/*
* Init or fini drivers and attachments. Either all or none
* are processed (via rollback). It would be nice if this were
* atomic to outside consumers, but with the current state of
* locking ...
*/
int
config_init_component(struct cfdriver * const *cfdriverv,
const struct cfattachinit *cfattachv, struct cfdata *cfdatav)
{
int error;
KERNEL_LOCK(1, NULL);
if ((error = frob_cfdrivervec(cfdriverv,
config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0)
goto out;
if ((error = frob_cfattachvec(cfattachv,
config_cfattach_attach, config_cfattach_detach,
"init", false)) != 0) {
frob_cfdrivervec(cfdriverv,
config_cfdriver_detach, NULL, "init rollback", true);
goto out;
}
if ((error = config_cfdata_attach(cfdatav, 1)) != 0) {
frob_cfattachvec(cfattachv,
config_cfattach_detach, NULL, "init rollback", true);
frob_cfdrivervec(cfdriverv,
config_cfdriver_detach, NULL, "init rollback", true);
goto out;
}
/* Success! */
error = 0;
out: KERNEL_UNLOCK_ONE(NULL);
return error;
}
int
config_fini_component(struct cfdriver * const *cfdriverv,
const struct cfattachinit *cfattachv, struct cfdata *cfdatav)
{
int error;
KERNEL_LOCK(1, NULL);
if ((error = config_cfdata_detach(cfdatav)) != 0)
goto out;
if ((error = frob_cfattachvec(cfattachv,
config_cfattach_detach, config_cfattach_attach,
"fini", false)) != 0) {
if (config_cfdata_attach(cfdatav, 0) != 0)
panic("config_cfdata fini rollback failed");
goto out;
}
if ((error = frob_cfdrivervec(cfdriverv,
config_cfdriver_detach, config_cfdriver_attach,
"fini", false)) != 0) {
frob_cfattachvec(cfattachv,
config_cfattach_attach, NULL, "fini rollback", true);
if (config_cfdata_attach(cfdatav, 0) != 0)
panic("config_cfdata fini rollback failed");
goto out;
}
/* Success! */
error = 0;
out: KERNEL_UNLOCK_ONE(NULL);
return error;
}
void
config_init_mi(void)
{
if (!config_initialized)
config_init();
sysctl_detach_setup(NULL);
}
void
config_deferred(device_t dev)
{
KASSERT(KERNEL_LOCKED_P());
config_process_deferred(&deferred_config_queue, dev);
config_process_deferred(&interrupt_config_queue, dev);
config_process_deferred(&mountroot_config_queue, dev);
}
static void
config_interrupts_thread(void *cookie)
{
struct deferred_config *dc;
device_t dev;
mutex_enter(&config_misc_lock);
while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) {
TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue);
mutex_exit(&config_misc_lock);
dev = dc->dc_dev;
(*dc->dc_func)(dev);
if (!device_pmf_is_registered(dev))
aprint_debug_dev(dev,
"WARNING: power management not supported\n");
config_pending_decr(dev);
kmem_free(dc, sizeof(*dc));
mutex_enter(&config_misc_lock);
}
mutex_exit(&config_misc_lock);
kthread_exit(0);
}
void
config_create_interruptthreads(void)
{
int i;
for (i = 0; i < interrupt_config_threads; i++) {
(void)kthread_create(PRI_NONE, 0/*XXXSMP */, NULL,
config_interrupts_thread, NULL, NULL, "configintr");
}
}
static void
config_mountroot_thread(void *cookie)
{
struct deferred_config *dc;
mutex_enter(&config_misc_lock);
while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) {
TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue);
mutex_exit(&config_misc_lock);
(*dc->dc_func)(dc->dc_dev);
kmem_free(dc, sizeof(*dc));
mutex_enter(&config_misc_lock);
}
mutex_exit(&config_misc_lock);
kthread_exit(0);
}
void
config_create_mountrootthreads(void)
{
int i;
if (!root_is_mounted)
root_is_mounted = true;
mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) *
mountroot_config_threads;
mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size,
KM_NOSLEEP);
KASSERT(mountroot_config_lwpids);
for (i = 0; i < mountroot_config_threads; i++) {
mountroot_config_lwpids[i] = 0;
(void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN/* XXXSMP */,
NULL, config_mountroot_thread, NULL,
&mountroot_config_lwpids[i],
"configroot");
}
}
void
config_finalize_mountroot(void)
{
int i, error;
for (i = 0; i < mountroot_config_threads; i++) {
if (mountroot_config_lwpids[i] == 0)
continue;
error = kthread_join(mountroot_config_lwpids[i]);
if (error)
printf("%s: thread %x joined with error %d\n",
__func__, i, error);
}
kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size);
}
/*
* Announce device attach/detach to userland listeners.
*/
int
no_devmon_insert(const char *name, prop_dictionary_t p)
{
return ENODEV;
}
static void
devmon_report_device(device_t dev, bool isattach)
{
prop_dictionary_t ev, dict = device_properties(dev);
const char *parent;
const char *what;
const char *where;
device_t pdev = device_parent(dev);
/* If currently no drvctl device, just return */
if (devmon_insert_vec == no_devmon_insert)
return;
ev = prop_dictionary_create();
if (ev == NULL)
return;
what = (isattach ? "device-attach" : "device-detach");
parent = (pdev == NULL ? "root" : device_xname(pdev));
if (prop_dictionary_get_string(dict, "location", &where)) {
prop_dictionary_set_string(ev, "location", where);
aprint_debug("ev: %s %s at %s in [%s]\n",
what, device_xname(dev), parent, where);
}
if (!prop_dictionary_set_string(ev, "device", device_xname(dev)) ||
!prop_dictionary_set_string(ev, "parent", parent)) {
prop_object_release(ev);
return;
}
if ((*devmon_insert_vec)(what, ev) != 0)
prop_object_release(ev);
}
/*
* Add a cfdriver to the system.
*/
int
config_cfdriver_attach(struct cfdriver *cd)
{
struct cfdriver *lcd;
/* Make sure this driver isn't already in the system. */
LIST_FOREACH(lcd, &allcfdrivers, cd_list) {
if (STREQ(lcd->cd_name, cd->cd_name))
return EEXIST;
}
LIST_INIT(&cd->cd_attach);
LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list);
return 0;
}
/*
* Remove a cfdriver from the system.
*/
int
config_cfdriver_detach(struct cfdriver *cd)
{
struct alldevs_foray af;
int i, rc = 0;
config_alldevs_enter(&af);
/* Make sure there are no active instances. */
for (i = 0; i < cd->cd_ndevs; i++) {
if (cd->cd_devs[i] != NULL) {
rc = EBUSY;
break;
}
}
config_alldevs_exit(&af);
if (rc != 0)
return rc;
/* ...and no attachments loaded. */
if (LIST_EMPTY(&cd->cd_attach) == 0)
return EBUSY;
LIST_REMOVE(cd, cd_list);
KASSERT(cd->cd_devs == NULL);
return 0;
}
/*
* Look up a cfdriver by name.
*/
struct cfdriver *
config_cfdriver_lookup(const char *name)
{
struct cfdriver *cd;
LIST_FOREACH(cd, &allcfdrivers, cd_list) {
if (STREQ(cd->cd_name, name))
return cd;
}
return NULL;
}
/*
* Add a cfattach to the specified driver.
*/
int
config_cfattach_attach(const char *driver, struct cfattach *ca)
{
struct cfattach *lca;
struct cfdriver *cd;
cd = config_cfdriver_lookup(driver);
if (cd == NULL)
return ESRCH;
/* Make sure this attachment isn't already on this driver. */
LIST_FOREACH(lca, &cd->cd_attach, ca_list) {
if (STREQ(lca->ca_name, ca->ca_name))
return EEXIST;
}
LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list);
return 0;
}
/*
* Remove a cfattach from the specified driver.
*/
int
config_cfattach_detach(const char *driver, struct cfattach *ca)
{
struct alldevs_foray af;
struct cfdriver *cd;
device_t dev;
int i, rc = 0;
cd = config_cfdriver_lookup(driver);
if (cd == NULL)
return ESRCH;
config_alldevs_enter(&af);
/* Make sure there are no active instances. */
for (i = 0; i < cd->cd_ndevs; i++) {
if ((dev = cd->cd_devs[i]) == NULL)
continue;
if (dev->dv_cfattach == ca) {
rc = EBUSY;
break;
}
}
config_alldevs_exit(&af);
if (rc != 0)
return rc;
LIST_REMOVE(ca, ca_list);
return 0;
}
/*
* Look up a cfattach by name.
*/
static struct cfattach *
config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname)
{
struct cfattach *ca;
LIST_FOREACH(ca, &cd->cd_attach, ca_list) {
if (STREQ(ca->ca_name, atname))
return ca;
}
return NULL;
}
/*
* Look up a cfattach by driver/attachment name.
*/
struct cfattach *
config_cfattach_lookup(const char *name, const char *atname)
{
struct cfdriver *cd;
cd = config_cfdriver_lookup(name);
if (cd == NULL)
return NULL;
return config_cfattach_lookup_cd(cd, atname);
}
/*
* Apply the matching function and choose the best. This is used
* a few times and we want to keep the code small.
*/
static void
mapply(struct matchinfo *m, cfdata_t cf)
{
int pri;
if (m->fn != NULL) {
pri = (*m->fn)(m->parent, cf, m->locs, m->aux);
} else {
pri = config_match(m->parent, cf, m->aux);
}
if (pri > m->pri) {
m->match = cf;
m->pri = pri;
}
}
int
config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux)
{
const struct cfiattrdata *ci;
const struct cflocdesc *cl;
int nlocs, i;
ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver);
KASSERT(ci);
nlocs = ci->ci_loclen;
KASSERT(!nlocs || locs);
for (i = 0; i < nlocs; i++) {
cl = &ci->ci_locdesc[i];
if (cl->cld_defaultstr != NULL &&
cf->cf_loc[i] == cl->cld_default)
continue;
if (cf->cf_loc[i] == locs[i])
continue;
return 0;
}
return config_match(parent, cf, aux);
}
/*
* Helper function: check whether the driver supports the interface attribute
* and return its descriptor structure.
*/
static const struct cfiattrdata *
cfdriver_get_iattr(const struct cfdriver *cd, const char *ia)
{
const struct cfiattrdata * const *cpp;
if (cd->cd_attrs == NULL)
return 0;
for (cpp = cd->cd_attrs; *cpp; cpp++) {
if (STREQ((*cpp)->ci_name, ia)) {
/* Match. */
return *cpp;
}
}
return 0;
}
static int __diagused
cfdriver_iattr_count(const struct cfdriver *cd)
{
const struct cfiattrdata * const *cpp;
int i;
if (cd->cd_attrs == NULL)
return 0;
for (i = 0, cpp = cd->cd_attrs; *cpp; cpp++) {
i++;
}
return i;
}
/*
* Lookup an interface attribute description by name.
* If the driver is given, consider only its supported attributes.
*/
const struct cfiattrdata *
cfiattr_lookup(const char *name, const struct cfdriver *cd)
{
const struct cfdriver *d;
const struct cfiattrdata *ia;
if (cd)
return cfdriver_get_iattr(cd, name);
LIST_FOREACH(d, &allcfdrivers, cd_list) {
ia = cfdriver_get_iattr(d, name);
if (ia)
return ia;
}
return 0;
}
/*
* Determine if `parent' is a potential parent for a device spec based
* on `cfp'.
*/
static int
cfparent_match(const device_t parent, const struct cfparent *cfp)
{
struct cfdriver *pcd;
/* We don't match root nodes here. */
if (cfp == NULL)
return 0;
pcd = parent->dv_cfdriver;
KASSERT(pcd != NULL);
/*
* First, ensure this parent has the correct interface
* attribute.
*/
if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr))
return 0;
/*
* If no specific parent device instance was specified (i.e.
* we're attaching to the attribute only), we're done!
*/
if (cfp->cfp_parent == NULL)
return 1;
/*
* Check the parent device's name.
*/
if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0)
return 0; /* not the same parent */
/*
* Make sure the unit number matches.
*/
if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */
cfp->cfp_unit == parent->dv_unit)
return 1;
/* Unit numbers don't match. */
return 0;
}
/*
* Helper for config_cfdata_attach(): check all devices whether it could be
* parent any attachment in the config data table passed, and rescan.
*/
static void
rescan_with_cfdata(const struct cfdata *cf)
{
device_t d;
const struct cfdata *cf1;
deviter_t di;
KASSERT(KERNEL_LOCKED_P());
/*
* "alldevs" is likely longer than a modules's cfdata, so make it
* the outer loop.
*/
for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) {
if (!(d->dv_cfattach->ca_rescan))
continue;
for (cf1 = cf; cf1->cf_name; cf1++) {
if (!cfparent_match(d, cf1->cf_pspec))
continue;
(*d->dv_cfattach->ca_rescan)(d,
cfdata_ifattr(cf1), cf1->cf_loc);
config_deferred(d);
}
}
deviter_release(&di);
}
/*
* Attach a supplemental config data table and rescan potential
* parent devices if required.
*/
int
config_cfdata_attach(cfdata_t cf, int scannow)
{
struct cftable *ct;
KERNEL_LOCK(1, NULL);
ct = kmem_alloc(sizeof(*ct), KM_SLEEP);
ct->ct_cfdata = cf;
TAILQ_INSERT_TAIL(&allcftables, ct, ct_list);
if (scannow)
rescan_with_cfdata(cf);
KERNEL_UNLOCK_ONE(NULL);
return 0;
}
/*
* Helper for config_cfdata_detach: check whether a device is
* found through any attachment in the config data table.
*/
static int
dev_in_cfdata(device_t d, cfdata_t cf)
{
const struct cfdata *cf1;
for (cf1 = cf; cf1->cf_name; cf1++)
if (d->dv_cfdata == cf1)
return 1;
return 0;
}