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NetBSD/sys/kern/subr_autoconf.c

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/* $NetBSD: subr_autoconf.c,v 1.55 2000/07/08 18:11:02 sommerfeld 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. 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, Berkeley and its contributors.
* 4. 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 1.55 2000/07/08 18:11:02 sommerfeld Exp $");
#include <sys/param.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <machine/limits.h>
/*
* Autoconfiguration subroutines.
*/
/*
* ioconf.c exports exactly two names: cfdata and cfroots. All system
* devices and drivers are found via these tables.
*/
extern struct cfdata cfdata[];
extern short cfroots[];
#define ROOT ((struct device *)NULL)
struct matchinfo {
cfmatch_t fn;
struct device *parent;
void *aux;
struct cfdata *match;
int pri;
};
static char *number(char *, int);
static void mapply(struct matchinfo *, struct cfdata *);
struct deferred_config {
TAILQ_ENTRY(deferred_config) dc_queue;
struct device *dc_dev;
void (*dc_func)(struct device *);
};
TAILQ_HEAD(deferred_config_head, deferred_config);
struct deferred_config_head deferred_config_queue;
struct deferred_config_head interrupt_config_queue;
static void config_process_deferred(struct deferred_config_head *,
struct device *);
struct devicelist alldevs; /* list of all devices */
struct evcntlist allevents; /* list of all event counters */
__volatile int config_pending; /* semaphore for mountroot */
/*
* Configure the system's hardware.
*/
void
configure(void)
{
TAILQ_INIT(&deferred_config_queue);
TAILQ_INIT(&interrupt_config_queue);
TAILQ_INIT(&alldevs);
TAILQ_INIT(&allevents);
/*
* Do the machine-dependent portion of autoconfiguration. This
* sets the configuration machinery here in motion by "finding"
* the root bus. When this function returns, we expect interrupts
* to be enabled.
*/
cpu_configure();
/*
* Now that we've found all the hardware, start the real time
* and statistics clocks.
*/
initclocks();
cold = 0; /* clocks are running, we're warm now! */
/*
* Now callback to finish configuration for devices which want
* to do this once interrupts are enabled.
*/
config_process_deferred(&interrupt_config_queue, NULL);
}
/*
* 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, struct cfdata *cf)
{
int pri;
if (m->fn != NULL)
pri = (*m->fn)(m->parent, cf, m->aux);
else {
if (cf->cf_attach->ca_match == NULL) {
panic("mapply: no match function for '%s' device\n",
cf->cf_driver->cd_name);
}
pri = (*cf->cf_attach->ca_match)(m->parent, cf, m->aux);
}
if (pri > m->pri) {
m->match = cf;
m->pri = pri;
}
}
/*
* Iterate over all potential children of some device, calling the given
* function (default being the child's match function) for each one.
* Nonzero returns are matches; the highest value returned is considered
* the best match. Return the `found child' if we got a match, or NULL
* otherwise. The `aux' pointer is simply passed on through.
*
* Note that this function is designed so that it can be used to apply
* an arbitrary function to all potential children (its return value
* can be ignored).
*/
struct cfdata *
config_search(cfmatch_t fn, struct device *parent, void *aux)
{
struct cfdata *cf;
short *p;
struct matchinfo m;
m.fn = fn;
m.parent = parent;
m.aux = aux;
m.match = NULL;
m.pri = 0;
for (cf = cfdata; cf->cf_driver; cf++) {
/*
* Skip cf if no longer eligible, otherwise scan through
* parents for one matching `parent', and try match function.
*/
if (cf->cf_fstate == FSTATE_FOUND)
continue;
for (p = cf->cf_parents; *p >= 0; p++)
if (parent->dv_cfdata == &cfdata[*p])
mapply(&m, cf);
}
return (m.match);
}
/*
* Find the given root device.
* This is much like config_search, but there is no parent.
*/
struct cfdata *
config_rootsearch(cfmatch_t fn, const char *rootname, void *aux)
{
struct cfdata *cf;
short *p;
struct matchinfo m;
m.fn = fn;
m.parent = ROOT;
m.aux = aux;
m.match = NULL;
m.pri = 0;
/*
* Look at root entries for matching name. We do not bother
* with found-state here since only one root should ever be
* searched (and it must be done first).
*/
for (p = cfroots; *p >= 0; p++) {
cf = &cfdata[*p];
if (strcmp(cf->cf_driver->cd_name, rootname) == 0)
mapply(&m, cf);
}
return (m.match);
}
static const char *msgs[3] = { "", " not configured\n", " unsupported\n" };
/*
* The given `aux' argument describes a device that has been found
* on the given parent, but not necessarily configured. Locate the
* configuration data for that device (using the submatch function
* provided, or using candidates' cd_match configuration driver
* functions) and attach it, and return true. If the device was
* not configured, call the given `print' function and return 0.
*/
struct device *
config_found_sm(struct device *parent, void *aux, cfprint_t print,
cfmatch_t submatch)
{
struct cfdata *cf;
if ((cf = config_search(submatch, parent, aux)) != NULL)
return (config_attach(parent, cf, aux, print));
if (print)
printf("%s", msgs[(*print)(aux, parent->dv_xname)]);
return (NULL);
}
/*
* As above, but for root devices.
*/
struct device *
config_rootfound(const char *rootname, void *aux)
{
struct cfdata *cf;
if ((cf = config_rootsearch((cfmatch_t)NULL, rootname, aux)) != NULL)
return (config_attach(ROOT, cf, aux, (cfprint_t)NULL));
printf("root device %s not configured\n", rootname);
return (NULL);
}
/* just like sprintf(buf, "%d") except that it works from the end */
static char *
number(char *ep, int n)
{
*--ep = 0;
while (n >= 10) {
*--ep = (n % 10) + '0';
n /= 10;
}
*--ep = n + '0';
return (ep);
}
/*
* Attach a found device. Allocates memory for device variables.
*/
struct device *
config_attach(struct device *parent, struct cfdata *cf, void *aux,
cfprint_t print)
{
struct device *dev;
struct cfdriver *cd;
struct cfattach *ca;
size_t lname, lunit;
const char *xunit;
int myunit;
char num[10];
cd = cf->cf_driver;
ca = cf->cf_attach;
if (ca->ca_devsize < sizeof(struct device))
panic("config_attach");
#ifndef __BROKEN_CONFIG_UNIT_USAGE
if (cf->cf_fstate == FSTATE_STAR) {
for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++)
if (cd->cd_devs[myunit] == NULL)
break;
/*
* myunit is now the unit of the first NULL device pointer,
* or max(cd->cd_ndevs,cf->cf_unit).
*/
} else {
myunit = cf->cf_unit;
#else /* __BROKEN_CONFIG_UNIT_USAGE */
myunit = cf->cf_unit;
if (cf->cf_fstate == FSTATE_STAR)
cf->cf_unit++;
else {
#endif /* __BROKEN_CONFIG_UNIT_USAGE */
KASSERT(cf->cf_fstate == FSTATE_NOTFOUND);
cf->cf_fstate = FSTATE_FOUND;
}
/* compute length of name and decimal expansion of unit number */
lname = strlen(cd->cd_name);
xunit = number(&num[sizeof(num)], myunit);
lunit = &num[sizeof(num)] - xunit;
if (lname + lunit >= sizeof(dev->dv_xname))
panic("config_attach: device name too long");
/* get memory for all device vars */
dev = (struct device *)malloc(ca->ca_devsize, M_DEVBUF,
cold ? M_NOWAIT : M_WAITOK);
if (!dev)
panic("config_attach: memory allocation for device softc failed");
memset(dev, 0, ca->ca_devsize);
TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */
dev->dv_class = cd->cd_class;
dev->dv_cfdata = cf;
dev->dv_unit = myunit;
memcpy(dev->dv_xname, cd->cd_name, lname);
memcpy(dev->dv_xname + lname, xunit, lunit);
dev->dv_parent = parent;
dev->dv_flags = DVF_ACTIVE; /* always initially active */
if (parent == ROOT)
printf("%s (root)", dev->dv_xname);
else {
printf("%s at %s", dev->dv_xname, parent->dv_xname);
if (print)
(void) (*print)(aux, NULL);
}
/* put this device in the devices array */
if (dev->dv_unit >= cd->cd_ndevs) {
/*
* Need to expand the array.
*/
int old = cd->cd_ndevs, new;
void **nsp;
if (old == 0)
new = MINALLOCSIZE / sizeof(void *);
else
new = old * 2;
while (new <= dev->dv_unit)
new *= 2;
cd->cd_ndevs = new;
nsp = malloc(new * sizeof(void *), M_DEVBUF,
cold ? M_NOWAIT : M_WAITOK);
if (nsp == 0)
panic("config_attach: %sing dev array",
old != 0 ? "expand" : "creat");
memset(nsp + old, 0, (new - old) * sizeof(void *));
if (old != 0) {
memcpy(nsp, cd->cd_devs, old * sizeof(void *));
free(cd->cd_devs, M_DEVBUF);
}
cd->cd_devs = nsp;
}
if (cd->cd_devs[dev->dv_unit])
panic("config_attach: duplicate %s", dev->dv_xname);
cd->cd_devs[dev->dv_unit] = dev;
/*
* Before attaching, clobber any unfound devices that are
* otherwise identical.
*/
#ifdef __BROKEN_CONFIG_UNIT_USAGE
/* bump the unit number on all starred cfdata for this device. */
#endif /* __BROKEN_CONFIG_UNIT_USAGE */
for (cf = cfdata; cf->cf_driver; cf++)
if (cf->cf_driver == cd && cf->cf_unit == dev->dv_unit) {
if (cf->cf_fstate == FSTATE_NOTFOUND)
cf->cf_fstate = FSTATE_FOUND;
#ifdef __BROKEN_CONFIG_UNIT_USAGE
if (cf->cf_fstate == FSTATE_STAR)
cf->cf_unit++;
#endif /* __BROKEN_CONFIG_UNIT_USAGE */
}
#ifdef __HAVE_DEVICE_REGISTER
device_register(dev, aux);
#endif
(*ca->ca_attach)(parent, dev, aux);
config_process_deferred(&deferred_config_queue, dev);
return (dev);
}
/*
* Detach a device. Optionally forced (e.g. because of hardware
* removal) and quiet. Returns zero if successful, non-zero
* (an error code) otherwise.
*
* Note that this code wants to be run from a process context, so
* that the detach can sleep to allow processes which have a device
* open to run and unwind their stacks.
*/
int
config_detach(struct device *dev, int flags)
{
struct cfdata *cf;
struct cfattach *ca;
struct cfdriver *cd;
#ifdef DIAGNOSTIC
struct device *d;
#endif
int rv = 0, i;
cf = dev->dv_cfdata;
#ifdef DIAGNOSTIC
if (cf->cf_fstate != FSTATE_FOUND && cf->cf_fstate != FSTATE_STAR)
panic("config_detach: bad device fstate");
#endif
ca = cf->cf_attach;
cd = cf->cf_driver;
/*
* Ensure the device is deactivated. If the device doesn't
* have an activation entry point, we allow DVF_ACTIVE to
* remain set. Otherwise, if DVF_ACTIVE is still set, the
* device is busy, and the detach fails.
*/
if (ca->ca_activate != NULL)
rv = config_deactivate(dev);
/*
* Try to detach the device. If that's not possible, then
* we either panic() (for the forced but failed case), or
* return an error.
*/
if (rv == 0) {
if (ca->ca_detach != NULL)
rv = (*ca->ca_detach)(dev, flags);
else
rv = EOPNOTSUPP;
}
if (rv != 0) {
if ((flags & DETACH_FORCE) == 0)
return (rv);
else
panic("config_detach: forced detach of %s failed (%d)",
dev->dv_xname, rv);
}
/*
* The device has now been successfully detached.
*/
#ifdef DIAGNOSTIC
/*
* Sanity: If you're successfully detached, you should have no
* children. (Note that because children must be attached
* after parents, we only need to search the latter part of
* the list.)
*/
for (d = TAILQ_NEXT(dev, dv_list); d != NULL;
d = TAILQ_NEXT(d, dv_list)) {
if (d->dv_parent == dev) {
printf("config_detach: detached device %s"
" has children %s\n", dev->dv_xname, d->dv_xname);
panic("config_detach");
}
}
#endif
/*
* Mark cfdata to show that the unit can be reused, if possible.
*/
#ifdef __BROKEN_CONFIG_UNIT_USAGE
/*
* Note that we can only re-use a starred unit number if the unit
* being detached had the last assigned unit number.
*/
#endif /* __BROKEN_CONFIG_UNIT_USAGE */
for (cf = cfdata; cf->cf_driver; cf++) {
if (cf->cf_driver == cd) {
if (cf->cf_fstate == FSTATE_FOUND &&
cf->cf_unit == dev->dv_unit)
cf->cf_fstate = FSTATE_NOTFOUND;
#ifdef __BROKEN_CONFIG_UNIT_USAGE
if (cf->cf_fstate == FSTATE_STAR &&
cf->cf_unit == dev->dv_unit + 1)
cf->cf_unit--;
#endif /* __BROKEN_CONFIG_UNIT_USAGE */
}
}
/*
* Unlink from device list.
*/
TAILQ_REMOVE(&alldevs, dev, dv_list);
/*
* Remove from cfdriver's array, tell the world, and free softc.
*/
cd->cd_devs[dev->dv_unit] = NULL;
if ((flags & DETACH_QUIET) == 0)
printf("%s detached\n", dev->dv_xname);
free(dev, M_DEVBUF);
/*
* If the device now has no units in use, deallocate its softc array.
*/
for (i = 0; i < cd->cd_ndevs; i++)
if (cd->cd_devs[i] != NULL)
break;
if (i == cd->cd_ndevs) { /* nothing found; deallocate */
free(cd->cd_devs, M_DEVBUF);
cd->cd_devs = NULL;
cd->cd_ndevs = 0;
}
/*
* Return success.
*/
return (0);
}
int
config_activate(struct device *dev)
{
struct cfattach *ca = dev->dv_cfdata->cf_attach;
int rv = 0, oflags = dev->dv_flags;
if (ca->ca_activate == NULL)
return (EOPNOTSUPP);
if ((dev->dv_flags & DVF_ACTIVE) == 0) {
dev->dv_flags |= DVF_ACTIVE;
rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE);
if (rv)
dev->dv_flags = oflags;
}
return (rv);
}
int
config_deactivate(struct device *dev)
{
struct cfattach *ca = dev->dv_cfdata->cf_attach;
int rv = 0, oflags = dev->dv_flags;
if (ca->ca_activate == NULL)
return (EOPNOTSUPP);
if (dev->dv_flags & DVF_ACTIVE) {
dev->dv_flags &= ~DVF_ACTIVE;
rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE);
if (rv)
dev->dv_flags = oflags;
}
return (rv);
}
/*
* Defer the configuration of the specified device until all
* of its parent's devices have been attached.
*/
void
config_defer(struct device *dev, void (*func)(struct device *))
{
struct deferred_config *dc;
if (dev->dv_parent == NULL)
panic("config_defer: can't defer config of a root device");
#ifdef DIAGNOSTIC
for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL;
dc = TAILQ_NEXT(dc, dc_queue)) {
if (dc->dc_dev == dev)
panic("config_defer: deferred twice");
}
#endif
dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK);
if (dc == NULL)
panic("config_defer: unable to allocate callback");
dc->dc_dev = dev;
dc->dc_func = func;
TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue);
config_pending_incr();
}
/*
* Defer some autoconfiguration for a device until after interrupts
* are enabled.
*/
void
config_interrupts(struct device *dev, void (*func)(struct device *))
{
struct deferred_config *dc;
/*
* If interrupts are enabled, callback now.
*/
if (cold == 0) {
(*func)(dev);
return;
}
#ifdef DIAGNOSTIC
for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL;
dc = TAILQ_NEXT(dc, dc_queue)) {
if (dc->dc_dev == dev)
panic("config_interrupts: deferred twice");
}
#endif
dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK);
if (dc == NULL)
panic("config_interrupts: unable to allocate callback");
dc->dc_dev = dev;
dc->dc_func = func;
TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue);
config_pending_incr();
}
/*
* Process a deferred configuration queue.
*/
static void
config_process_deferred(struct deferred_config_head *queue,
struct device *parent)
{
struct deferred_config *dc, *ndc;
for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) {
ndc = TAILQ_NEXT(dc, dc_queue);
if (parent == NULL || dc->dc_dev->dv_parent == parent) {
TAILQ_REMOVE(queue, dc, dc_queue);
(*dc->dc_func)(dc->dc_dev);
free(dc, M_DEVBUF);
config_pending_decr();
}
}
}
/*
* Manipulate the config_pending semaphore.
*/
void
config_pending_incr(void)
{
config_pending++;
}
void
config_pending_decr(void)
{
#ifdef DIAGNOSTIC
if (config_pending == 0)
panic("config_pending_decr: config_pending == 0");
#endif
config_pending--;
if (config_pending == 0)
wakeup((void *)&config_pending);
}
/*
* Attach a statically-initialized event. The type and string pointers
* are already set up.
*/
void
evcnt_attach_static(struct evcnt *ev)
{
int len;
len = strlen(ev->ev_group);
#ifdef DIAGNOSTIC
if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */
panic("evcnt_attach_static: group length (%s)", ev->ev_group);
#endif
ev->ev_grouplen = len;
len = strlen(ev->ev_name);
#ifdef DIAGNOSTIC
if (len >= EVCNT_STRING_MAX) /* ..._MAX includes NUL */
panic("evcnt_attach_static: name length (%s)", ev->ev_name);
#endif
ev->ev_namelen = len;
TAILQ_INSERT_TAIL(&allevents, ev, ev_list);
}
/*
* Attach a dynamically-initialized event. Zero it, set up the type
* and string pointers and then act like it was statically initialized.
*/
void
evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent,
const char *group, const char *name)
{
memset(ev, 0, sizeof *ev);
ev->ev_type = type;
ev->ev_parent = parent;
ev->ev_group = group;
ev->ev_name = name;
evcnt_attach_static(ev);
}
/*
* Detach an event.
*/
void
evcnt_detach(struct evcnt *ev)
{
TAILQ_REMOVE(&allevents, ev, ev_list);
}
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