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b0ad6e203a
freebsd/sys/kern/subr_bus.c
Bruce Evans ffe4d2f7c7 Fixed 3 regressions in rev.1.99 (clobbering of the English fix in rev.1.98, 
and 2 unformattings).
2002-02-26 16:17:45 +00:00

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/*-
* Copyright (c) 1997,1998 Doug Rabson
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include "opt_bus.h"
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/kobj.h>
#include <sys/bus_private.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/stdarg.h> /* for device_printf() */
static MALLOC_DEFINE(M_BUS, "bus", "Bus data structures");
#ifdef BUS_DEBUG
static int bus_debug = 1;
SYSCTL_INT(_debug, OID_AUTO, bus_debug, CTLFLAG_RW, &bus_debug, 0,
"Debug bus code");
#define PDEBUG(a) if (bus_debug) {printf("%s:%d: ", __func__, __LINE__), printf a, printf("\n");}
#define DEVICENAME(d) ((d)? device_get_name(d): "no device")
#define DRIVERNAME(d) ((d)? d->name : "no driver")
#define DEVCLANAME(d) ((d)? d->name : "no devclass")
/* Produce the indenting, indent*2 spaces plus a '.' ahead of that to
* prevent syslog from deleting initial spaces
*/
#define indentprintf(p) do { int iJ; printf("."); for (iJ=0; iJ<indent; iJ++) printf(" "); printf p ; } while (0)
static void print_device_short(device_t dev, int indent);
static void print_device(device_t dev, int indent);
void print_device_tree_short(device_t dev, int indent);
void print_device_tree(device_t dev, int indent);
static void print_driver_short(driver_t *driver, int indent);
static void print_driver(driver_t *driver, int indent);
static void print_driver_list(driver_list_t drivers, int indent);
static void print_devclass_short(devclass_t dc, int indent);
static void print_devclass(devclass_t dc, int indent);
void print_devclass_list_short(void);
void print_devclass_list(void);
#else
/* Make the compiler ignore the function calls */
#define PDEBUG(a) /* nop */
#define DEVICENAME(d) /* nop */
#define DRIVERNAME(d) /* nop */
#define DEVCLANAME(d) /* nop */
#define print_device_short(d,i) /* nop */
#define print_device(d,i) /* nop */
#define print_device_tree_short(d,i) /* nop */
#define print_device_tree(d,i) /* nop */
#define print_driver_short(d,i) /* nop */
#define print_driver(d,i) /* nop */
#define print_driver_list(d,i) /* nop */
#define print_devclass_short(d,i) /* nop */
#define print_devclass(d,i) /* nop */
#define print_devclass_list_short() /* nop */
#define print_devclass_list() /* nop */
#endif
TAILQ_HEAD(,device) bus_data_devices;
static int bus_data_generation = 1;
kobj_method_t null_methods[] = {
{ 0, 0 }
};
DEFINE_CLASS(null, null_methods, 0);
/*
* Devclass implementation
*/
static devclass_list_t devclasses = TAILQ_HEAD_INITIALIZER(devclasses);
static devclass_t
devclass_find_internal(const char *classname, int create)
{
devclass_t dc;
PDEBUG(("looking for %s", classname));
if (!classname)
return (NULL);
TAILQ_FOREACH(dc, &devclasses, link) {
if (!strcmp(dc->name, classname))
return (dc);
}
PDEBUG(("%s not found%s", classname, (create? ", creating": "")));
if (create) {
dc = malloc(sizeof(struct devclass) + strlen(classname) + 1,
M_BUS, M_NOWAIT|M_ZERO);
if (!dc)
return (NULL);
dc->name = (char*) (dc + 1);
strcpy(dc->name, classname);
TAILQ_INIT(&dc->drivers);
TAILQ_INSERT_TAIL(&devclasses, dc, link);
bus_data_generation_update();
}
return (dc);
}
devclass_t
devclass_create(const char *classname)
{
return (devclass_find_internal(classname, TRUE));
}
devclass_t
devclass_find(const char *classname)
{
return (devclass_find_internal(classname, FALSE));
}
int
devclass_add_driver(devclass_t dc, driver_t *driver)
{
driverlink_t dl;
int i;
PDEBUG(("%s", DRIVERNAME(driver)));
dl = malloc(sizeof *dl, M_BUS, M_NOWAIT|M_ZERO);
if (!dl)
return (ENOMEM);
/*
* Compile the driver's methods. Also increase the reference count
* so that the class doesn't get freed when the last instance
* goes. This means we can safely use static methods and avoids a
* double-free in devclass_delete_driver.
*/
kobj_class_compile((kobj_class_t) driver);
/*
* Make sure the devclass which the driver is implementing exists.
*/
devclass_find_internal(driver->name, TRUE);
dl->driver = driver;
TAILQ_INSERT_TAIL(&dc->drivers, dl, link);
driver->refs++;
/*
* Call BUS_DRIVER_ADDED for any existing busses in this class.
*/
for (i = 0; i < dc->maxunit; i++)
if (dc->devices[i])
BUS_DRIVER_ADDED(dc->devices[i], driver);
bus_data_generation_update();
return (0);
}
int
devclass_delete_driver(devclass_t busclass, driver_t *driver)
{
devclass_t dc = devclass_find(driver->name);
driverlink_t dl;
device_t dev;
int i;
int error;
PDEBUG(("%s from devclass %s", driver->name, DEVCLANAME(busclass)));
if (!dc)
return (0);
/*
* Find the link structure in the bus' list of drivers.
*/
TAILQ_FOREACH(dl, &busclass->drivers, link) {
if (dl->driver == driver)
break;
}
if (!dl) {
PDEBUG(("%s not found in %s list", driver->name,
busclass->name));
return (ENOENT);
}
/*
* Disassociate from any devices. We iterate through all the
* devices in the devclass of the driver and detach any which are
* using the driver and which have a parent in the devclass which
* we are deleting from.
*
* Note that since a driver can be in multiple devclasses, we
* should not detach devices which are not children of devices in
* the affected devclass.
*/
for (i = 0; i < dc->maxunit; i++) {
if (dc->devices[i]) {
dev = dc->devices[i];
if (dev->driver == driver && dev->parent &&
dev->parent->devclass == busclass) {
if ((error = device_detach(dev)) != 0)
return (error);
device_set_driver(dev, NULL);
}
}
}
TAILQ_REMOVE(&busclass->drivers, dl, link);
free(dl, M_BUS);
driver->refs--;
if (driver->refs == 0)
kobj_class_free((kobj_class_t) driver);
bus_data_generation_update();
return (0);
}
static driverlink_t
devclass_find_driver_internal(devclass_t dc, const char *classname)
{
driverlink_t dl;
PDEBUG(("%s in devclass %s", classname, DEVCLANAME(dc)));
TAILQ_FOREACH(dl, &dc->drivers, link) {
if (!strcmp(dl->driver->name, classname))
return (dl);
}
PDEBUG(("not found"));
return (NULL);
}
driver_t *
devclass_find_driver(devclass_t dc, const char *classname)
{
driverlink_t dl;
dl = devclass_find_driver_internal(dc, classname);
if (dl)
return (dl->driver);
return (NULL);
}
const char *
devclass_get_name(devclass_t dc)
{
return (dc->name);
}
device_t
devclass_get_device(devclass_t dc, int unit)
{
if (dc == NULL || unit < 0 || unit >= dc->maxunit)
return (NULL);
return (dc->devices[unit]);
}
void *
devclass_get_softc(devclass_t dc, int unit)
{
device_t dev;
dev = devclass_get_device(dc, unit);
if (!dev)
return (NULL);
return (device_get_softc(dev));
}
int
devclass_get_devices(devclass_t dc, device_t **devlistp, int *devcountp)
{
int i;
int count;
device_t *list;
count = 0;
for (i = 0; i < dc->maxunit; i++)
if (dc->devices[i])
count++;
list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT|M_ZERO);
if (!list)
return (ENOMEM);
count = 0;
for (i = 0; i < dc->maxunit; i++) {
if (dc->devices[i]) {
list[count] = dc->devices[i];
count++;
}
}
*devlistp = list;
*devcountp = count;
return (0);
}
int
devclass_get_maxunit(devclass_t dc)
{
return (dc->maxunit);
}
int
devclass_find_free_unit(devclass_t dc, int unit)
{
if (dc == NULL)
return (unit);
while (unit < dc->maxunit && dc->devices[unit] != NULL)
unit++;
return (unit);
}
static int
devclass_alloc_unit(devclass_t dc, int *unitp)
{
int unit = *unitp;
PDEBUG(("unit %d in devclass %s", unit, DEVCLANAME(dc)));
/* If we were given a wired unit number, check for existing device */
/* XXX imp XXX */
if (unit != -1) {
if (unit >= 0 && unit < dc->maxunit &&
dc->devices[unit] != NULL) {
if (bootverbose)
printf("%s: %s%d already exists; skipping it\n",
dc->name, dc->name, *unitp);
return (EEXIST);
}
} else {
/* Unwired device, find the next available slot for it */
unit = 0;
while (unit < dc->maxunit && dc->devices[unit] != NULL)
unit++;
}
/*
* We've selected a unit beyond the length of the table, so let's
* extend the table to make room for all units up to and including
* this one.
*/
if (unit >= dc->maxunit) {
device_t *newlist;
int newsize;
newsize = roundup((unit + 1), MINALLOCSIZE / sizeof(device_t));
newlist = malloc(sizeof(device_t) * newsize, M_BUS, M_NOWAIT);
if (!newlist)
return (ENOMEM);
bcopy(dc->devices, newlist, sizeof(device_t) * dc->maxunit);
bzero(newlist + dc->maxunit,
sizeof(device_t) * (newsize - dc->maxunit));
if (dc->devices)
free(dc->devices, M_BUS);
dc->devices = newlist;
dc->maxunit = newsize;
}
PDEBUG(("now: unit %d in devclass %s", unit, DEVCLANAME(dc)));
*unitp = unit;
return (0);
}
static int
devclass_add_device(devclass_t dc, device_t dev)
{
int buflen, error;
PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
buflen = strlen(dc->name) + 5;
dev->nameunit = malloc(buflen, M_BUS, M_NOWAIT|M_ZERO);
if (!dev->nameunit)
return (ENOMEM);
if ((error = devclass_alloc_unit(dc, &dev->unit)) != 0) {
free(dev->nameunit, M_BUS);
dev->nameunit = NULL;
return (error);
}
dc->devices[dev->unit] = dev;
dev->devclass = dc;
snprintf(dev->nameunit, buflen, "%s%d", dc->name, dev->unit);
return (0);
}
static int
devclass_delete_device(devclass_t dc, device_t dev)
{
if (!dc || !dev)
return (0);
PDEBUG(("%s in devclass %s", DEVICENAME(dev), DEVCLANAME(dc)));
if (dev->devclass != dc || dc->devices[dev->unit] != dev)
panic("devclass_delete_device: inconsistent device class");
dc->devices[dev->unit] = NULL;
if (dev->flags & DF_WILDCARD)
dev->unit = -1;
dev->devclass = NULL;
free(dev->nameunit, M_BUS);
dev->nameunit = NULL;
return (0);
}
static device_t
make_device(device_t parent, const char *name, int unit)
{
device_t dev;
devclass_t dc;
PDEBUG(("%s at %s as unit %d", name, DEVICENAME(parent), unit));
if (name) {
dc = devclass_find_internal(name, TRUE);
if (!dc) {
printf("make_device: can't find device class %s\n",
name);
return (NULL);
}
} else {
dc = NULL;
}
dev = malloc(sizeof(struct device), M_BUS, M_NOWAIT|M_ZERO);
if (!dev)
return (NULL);
dev->parent = parent;
TAILQ_INIT(&dev->children);
kobj_init((kobj_t) dev, &null_class);
dev->driver = NULL;
dev->devclass = NULL;
dev->unit = unit;
dev->nameunit = NULL;
dev->desc = NULL;
dev->busy = 0;
dev->devflags = 0;
dev->flags = DF_ENABLED;
dev->order = 0;
if (unit == -1)
dev->flags |= DF_WILDCARD;
if (name) {
dev->flags |= DF_FIXEDCLASS;
if (devclass_add_device(dc, dev)) {
kobj_delete((kobj_t) dev, M_BUS);
return (NULL);
}
}
dev->ivars = NULL;
dev->softc = NULL;
dev->state = DS_NOTPRESENT;
TAILQ_INSERT_TAIL(&bus_data_devices, dev, devlink);
bus_data_generation_update();
return (dev);
}
static int
device_print_child(device_t dev, device_t child)
{
int retval = 0;
if (device_is_alive(child))
retval += BUS_PRINT_CHILD(dev, child);
else
retval += device_printf(child, " not found\n");
return (retval);
}
device_t
device_add_child(device_t dev, const char *name, int unit)
{
return (device_add_child_ordered(dev, 0, name, unit));
}
device_t
device_add_child_ordered(device_t dev, int order, const char *name, int unit)
{
device_t child;
device_t place;
PDEBUG(("%s at %s with order %d as unit %d",
name, DEVICENAME(dev), order, unit));
child = make_device(dev, name, unit);
if (child == NULL)
return (child);
child->order = order;
TAILQ_FOREACH(place, &dev->children, link) {
if (place->order > order)
break;
}
if (place) {
/*
* The device 'place' is the first device whose order is
* greater than the new child.
*/
TAILQ_INSERT_BEFORE(place, child, link);
} else {
/*
* The new child's order is greater or equal to the order of
* any existing device. Add the child to the tail of the list.
*/
TAILQ_INSERT_TAIL(&dev->children, child, link);
}
bus_data_generation_update();
return (child);
}
int
device_delete_child(device_t dev, device_t child)
{
int error;
device_t grandchild;
PDEBUG(("%s from %s", DEVICENAME(child), DEVICENAME(dev)));
/* remove children first */
while ( (grandchild = TAILQ_FIRST(&child->children)) ) {
error = device_delete_child(child, grandchild);
if (error)
return (error);
}
if ((error = device_detach(child)) != 0)
return (error);
if (child->devclass)
devclass_delete_device(child->devclass, child);
TAILQ_REMOVE(&dev->children, child, link);
TAILQ_REMOVE(&bus_data_devices, child, devlink);
device_set_desc(child, NULL);
free(child, M_BUS);
bus_data_generation_update();
return (0);
}
/*
* Find only devices attached to this bus.
*/
device_t
device_find_child(device_t dev, const char *classname, int unit)
{
devclass_t dc;
device_t child;
dc = devclass_find(classname);
if (!dc)
return (NULL);
child = devclass_get_device(dc, unit);
if (child && child->parent == dev)
return (child);
return (NULL);
}
static driverlink_t
first_matching_driver(devclass_t dc, device_t dev)
{
if (dev->devclass)
return (devclass_find_driver_internal(dc, dev->devclass->name));
return (TAILQ_FIRST(&dc->drivers));
}
static driverlink_t
next_matching_driver(devclass_t dc, device_t dev, driverlink_t last)
{
if (dev->devclass) {
driverlink_t dl;
for (dl = TAILQ_NEXT(last, link); dl; dl = TAILQ_NEXT(dl, link))
if (!strcmp(dev->devclass->name, dl->driver->name))
return (dl);
return (NULL);
}
return (TAILQ_NEXT(last, link));
}
static int
device_probe_child(device_t dev, device_t child)
{
devclass_t dc;
driverlink_t best = 0;
driverlink_t dl;
int result, pri = 0;
int hasclass = (child->devclass != 0);
dc = dev->devclass;
if (!dc)
panic("device_probe_child: parent device has no devclass");
if (child->state == DS_ALIVE)
return (0);
for (dl = first_matching_driver(dc, child);
dl;
dl = next_matching_driver(dc, child, dl)) {
PDEBUG(("Trying %s", DRIVERNAME(dl->driver)));
device_set_driver(child, dl->driver);
if (!hasclass)
device_set_devclass(child, dl->driver->name);
result = DEVICE_PROBE(child);
if (!hasclass)
device_set_devclass(child, 0);
/*
* If the driver returns SUCCESS, there can be no higher match
* for this device.
*/
if (result == 0) {
best = dl;
pri = 0;
break;
}
/*
* The driver returned an error so it certainly doesn't match.
*/
if (result > 0) {
device_set_driver(child, 0);
continue;
}
/*
* A priority lower than SUCCESS, remember the best matching
* driver. Initialise the value of pri for the first match.
*/
if (best == 0 || result > pri) {
best = dl;
pri = result;
continue;
}
}
/*
* If we found a driver, change state and initialise the devclass.
*/
if (best) {
if (!child->devclass)
device_set_devclass(child, best->driver->name);
device_set_driver(child, best->driver);
if (pri < 0) {
/*
* A bit bogus. Call the probe method again to make
* sure that we have the right description.
*/
DEVICE_PROBE(child);
}
child->state = DS_ALIVE;
bus_data_generation_update();
return (0);
}
return (ENXIO);
}
device_t
device_get_parent(device_t dev)
{
return (dev->parent);
}
int
device_get_children(device_t dev, device_t **devlistp, int *devcountp)
{
int count;
device_t child;
device_t *list;
count = 0;
TAILQ_FOREACH(child, &dev->children, link) {
count++;
}
list = malloc(count * sizeof(device_t), M_TEMP, M_NOWAIT|M_ZERO);
if (!list)
return (ENOMEM);
count = 0;
TAILQ_FOREACH(child, &dev->children, link) {
list[count] = child;
count++;
}
*devlistp = list;
*devcountp = count;
return (0);
}
driver_t *
device_get_driver(device_t dev)
{
return (dev->driver);
}
devclass_t
device_get_devclass(device_t dev)
{
return (dev->devclass);
}
const char *
device_get_name(device_t dev)
{
if (dev->devclass)
return (devclass_get_name(dev->devclass));
return (NULL);
}
const char *
device_get_nameunit(device_t dev)
{
return (dev->nameunit);
}
int
device_get_unit(device_t dev)
{
return (dev->unit);
}
const char *
device_get_desc(device_t dev)
{
return (dev->desc);
}
u_int32_t
device_get_flags(device_t dev)
{
return (dev->devflags);
}
int
device_print_prettyname(device_t dev)
{
const char *name = device_get_name(dev);
if (name == 0)
return (printf("unknown: "));
return (printf("%s%d: ", name, device_get_unit(dev)));
}
int
device_printf(device_t dev, const char * fmt, ...)
{
va_list ap;
int retval;
retval = device_print_prettyname(dev);
va_start(ap, fmt);
retval += vprintf(fmt, ap);
va_end(ap);
return (retval);
}
static void
device_set_desc_internal(device_t dev, const char* desc, int copy)
{
if (dev->desc && (dev->flags & DF_DESCMALLOCED)) {
free(dev->desc, M_BUS);
dev->flags &= ~DF_DESCMALLOCED;
dev->desc = NULL;
}
if (copy && desc) {
dev->desc = malloc(strlen(desc) + 1, M_BUS, M_NOWAIT);
if (dev->desc) {
strcpy(dev->desc, desc);
dev->flags |= DF_DESCMALLOCED;
}
} else {
/* Avoid a -Wcast-qual warning */
dev->desc = (char *)(uintptr_t) desc;
}
bus_data_generation_update();
}
void
device_set_desc(device_t dev, const char* desc)
{
device_set_desc_internal(dev, desc, FALSE);
}
void
device_set_desc_copy(device_t dev, const char* desc)
{
device_set_desc_internal(dev, desc, TRUE);
}
void
device_set_flags(device_t dev, u_int32_t flags)
{
dev->devflags = flags;
}
void *
device_get_softc(device_t dev)
{
return (dev->softc);
}
void
device_set_softc(device_t dev, void *softc)
{
if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC))
free(dev->softc, M_BUS);
dev->softc = softc;
if (dev->softc)
dev->flags |= DF_EXTERNALSOFTC;
else
dev->flags &= ~DF_EXTERNALSOFTC;
}
void *
device_get_ivars(device_t dev)
{
return (dev->ivars);
}
void
device_set_ivars(device_t dev, void * ivars)
{
if (!dev)
return;
dev->ivars = ivars;
return;
}
device_state_t
device_get_state(device_t dev)
{
return (dev->state);
}
void
device_enable(device_t dev)
{
dev->flags |= DF_ENABLED;
}
void
device_disable(device_t dev)
{
dev->flags &= ~DF_ENABLED;
}
void
device_busy(device_t dev)
{
if (dev->state < DS_ATTACHED)
panic("device_busy: called for unattached device");
if (dev->busy == 0 && dev->parent)
device_busy(dev->parent);
dev->busy++;
dev->state = DS_BUSY;
}
void
device_unbusy(device_t dev)
{
if (dev->state != DS_BUSY)
panic("device_unbusy: called for non-busy device");
dev->busy--;
if (dev->busy == 0) {
if (dev->parent)
device_unbusy(dev->parent);
dev->state = DS_ATTACHED;
}
}
void
device_quiet(device_t dev)
{
dev->flags |= DF_QUIET;
}
void
device_verbose(device_t dev)
{
dev->flags &= ~DF_QUIET;
}
int
device_is_quiet(device_t dev)
{
return ((dev->flags & DF_QUIET) != 0);
}
int
device_is_enabled(device_t dev)
{
return ((dev->flags & DF_ENABLED) != 0);
}
int
device_is_alive(device_t dev)
{
return (dev->state >= DS_ALIVE);
}
int
device_set_devclass(device_t dev, const char *classname)
{
devclass_t dc;
int error;
if (!classname) {
if (dev->devclass)
devclass_delete_device(dev->devclass, dev);
return (0);
}
if (dev->devclass) {
printf("device_set_devclass: device class already set\n");
return (EINVAL);
}
dc = devclass_find_internal(classname, TRUE);
if (!dc)
return (ENOMEM);
error = devclass_add_device(dc, dev);
bus_data_generation_update();
return (error);
}
int
device_set_driver(device_t dev, driver_t *driver)
{
if (dev->state >= DS_ATTACHED)
return (EBUSY);
if (dev->driver == driver)
return (0);
if (dev->softc && !(dev->flags & DF_EXTERNALSOFTC)) {
free(dev->softc, M_BUS);
dev->softc = NULL;
}
kobj_delete((kobj_t) dev, 0);
dev->driver = driver;
if (driver) {
kobj_init((kobj_t) dev, (kobj_class_t) driver);
if (!(dev->flags & DF_EXTERNALSOFTC)) {
dev->softc = malloc(driver->size, M_BUS,
M_NOWAIT | M_ZERO);
if (!dev->softc) {
kobj_init((kobj_t) dev, &null_class);
dev->driver = NULL;
return (ENOMEM);
}
}
} else {
kobj_init((kobj_t) dev, &null_class);
}
bus_data_generation_update();
return (0);
}
int
device_probe_and_attach(device_t dev)
{
device_t bus = dev->parent;
int error = 0;
int hasclass = (dev->devclass != 0);
if (dev->state >= DS_ALIVE)
return (0);
if (dev->flags & DF_ENABLED) {
error = device_probe_child(bus, dev);
if (!error) {
if (!device_is_quiet(dev))
device_print_child(bus, dev);
error = DEVICE_ATTACH(dev);
if (!error)
dev->state = DS_ATTACHED;
else {
printf("device_probe_and_attach: %s%d attach returned %d\n",
dev->driver->name, dev->unit, error);
/* Unset the class; set in device_probe_child */
if (!hasclass)
device_set_devclass(dev, 0);
device_set_driver(dev, NULL);
dev->state = DS_NOTPRESENT;
}
} else {
if (!(dev->flags & DF_DONENOMATCH)) {
BUS_PROBE_NOMATCH(bus, dev);
dev->flags |= DF_DONENOMATCH;
}
}
} else {
if (bootverbose) {
device_print_prettyname(dev);
printf("not probed (disabled)\n");
}
}
return (error);
}
int
device_detach(device_t dev)
{
int error;
PDEBUG(("%s", DEVICENAME(dev)));
if (dev->state == DS_BUSY)
return (EBUSY);
if (dev->state != DS_ATTACHED)
return (0);
if ((error = DEVICE_DETACH(dev)) != 0)
return (error);
device_printf(dev, "detached\n");
if (dev->parent)
BUS_CHILD_DETACHED(dev->parent, dev);
if (!(dev->flags & DF_FIXEDCLASS))
devclass_delete_device(dev->devclass, dev);
dev->state = DS_NOTPRESENT;
device_set_driver(dev, NULL);
return (0);
}
int
device_shutdown(device_t dev)
{
if (dev->state < DS_ATTACHED)
return (0);
return (DEVICE_SHUTDOWN(dev));
}
int
device_set_unit(device_t dev, int unit)
{
devclass_t dc;
int err;
dc = device_get_devclass(dev);
if (unit < dc->maxunit && dc->devices[unit])
return (EBUSY);
err = devclass_delete_device(dc, dev);
if (err)
return (err);
dev->unit = unit;
err = devclass_add_device(dc, dev);
if (err)
return (err);
bus_data_generation_update();
return (0);
}
/*======================================*/
/*
* Some useful method implementations to make life easier for bus drivers.
*/
void
resource_list_init(struct resource_list *rl)
{
SLIST_INIT(rl);
}
void
resource_list_free(struct resource_list *rl)
{
struct resource_list_entry *rle;
while ((rle = SLIST_FIRST(rl)) != NULL) {
if (rle->res)
panic("resource_list_free: resource entry is busy");
SLIST_REMOVE_HEAD(rl, link);
free(rle, M_BUS);
}
}
void
resource_list_add(struct resource_list *rl, int type, int rid,
u_long start, u_long end, u_long count)
{
struct resource_list_entry *rle;
rle = resource_list_find(rl, type, rid);
if (!rle) {
rle = malloc(sizeof(struct resource_list_entry), M_BUS,
M_NOWAIT);
if (!rle)
panic("resource_list_add: can't record entry");
SLIST_INSERT_HEAD(rl, rle, link);
rle->type = type;
rle->rid = rid;
rle->res = NULL;
}
if (rle->res)
panic("resource_list_add: resource entry is busy");
rle->start = start;
rle->end = end;
rle->count = count;
}
struct resource_list_entry *
resource_list_find(struct resource_list *rl, int type, int rid)
{
struct resource_list_entry *rle;
SLIST_FOREACH(rle, rl, link) {
if (rle->type == type && rle->rid == rid)
return (rle);
}
return (NULL);
}
void
resource_list_delete(struct resource_list *rl, int type, int rid)
{
struct resource_list_entry *rle = resource_list_find(rl, type, rid);
if (rle) {
if (rle->res != NULL)
panic("resource_list_delete: resource has not been released");
SLIST_REMOVE(rl, rle, resource_list_entry, link);
free(rle, M_BUS);
}
}
struct resource *
resource_list_alloc(struct resource_list *rl, device_t bus, device_t child,
int type, int *rid, u_long start, u_long end, u_long count, u_int flags)
{
struct resource_list_entry *rle = 0;
int passthrough = (device_get_parent(child) != bus);
int isdefault = (start == 0UL && end == ~0UL);
if (passthrough) {
return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
type, rid, start, end, count, flags));
}
rle = resource_list_find(rl, type, *rid);
if (!rle)
return (NULL); /* no resource of that type/rid */
if (rle->res)
panic("resource_list_alloc: resource entry is busy");
if (isdefault) {
start = rle->start;
count = ulmax(count, rle->count);
end = ulmax(rle->end, start + count - 1);
}
rle->res = BUS_ALLOC_RESOURCE(device_get_parent(bus), child,
type, rid, start, end, count, flags);
/*
* Record the new range.
*/
if (rle->res) {
rle->start = rman_get_start(rle->res);
rle->end = rman_get_end(rle->res);
rle->count = count;
}
return (rle->res);
}
int
resource_list_release(struct resource_list *rl, device_t bus, device_t child,
int type, int rid, struct resource *res)
{
struct resource_list_entry *rle = 0;
int passthrough = (device_get_parent(child) != bus);
int error;
if (passthrough) {
return (BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
type, rid, res));
}
rle = resource_list_find(rl, type, rid);
if (!rle)
panic("resource_list_release: can't find resource");
if (!rle->res)
panic("resource_list_release: resource entry is not busy");
error = BUS_RELEASE_RESOURCE(device_get_parent(bus), child,
type, rid, res);
if (error)
return (error);
rle->res = NULL;
return (0);
}
int
resource_list_print_type(struct resource_list *rl, const char *name, int type,
const char *format)
{
struct resource_list_entry *rle;
int printed, retval;
printed = 0;
retval = 0;
/* Yes, this is kinda cheating */
SLIST_FOREACH(rle, rl, link) {
if (rle->type == type) {
if (printed == 0)
retval += printf(" %s ", name);
else
retval += printf(",");
printed++;
retval += printf(format, rle->start);
if (rle->count > 1) {
retval += printf("-");
retval += printf(format, rle->start +
rle->count - 1);
}
}
}
return (retval);
}
/*
* Call DEVICE_IDENTIFY for each driver.
*/
int
bus_generic_probe(device_t dev)
{
devclass_t dc = dev->devclass;
driverlink_t dl;
TAILQ_FOREACH(dl, &dc->drivers, link) {
DEVICE_IDENTIFY(dl->driver, dev);
}
return (0);
}
int
bus_generic_attach(device_t dev)
{
device_t child;
TAILQ_FOREACH(child, &dev->children, link) {
device_probe_and_attach(child);
}
return (0);
}
int
bus_generic_detach(device_t dev)
{
device_t child;
int error;
if (dev->state != DS_ATTACHED)
return (EBUSY);
TAILQ_FOREACH(child, &dev->children, link) {
if ((error = device_detach(child)) != 0)
return (error);
}
return (0);
}
int
bus_generic_shutdown(device_t dev)
{
device_t child;
TAILQ_FOREACH(child, &dev->children, link) {
device_shutdown(child);
}
return (0);
}
int
bus_generic_suspend(device_t dev)
{
int error;
device_t child, child2;
TAILQ_FOREACH(child, &dev->children, link) {
error = DEVICE_SUSPEND(child);
if (error) {
for (child2 = TAILQ_FIRST(&dev->children);
child2 && child2 != child;
child2 = TAILQ_NEXT(child2, link))
DEVICE_RESUME(child2);
return (error);
}
}
return (0);
}
int
bus_generic_resume(device_t dev)
{
device_t child;
TAILQ_FOREACH(child, &dev->children, link) {
DEVICE_RESUME(child);
/* if resume fails, there's nothing we can usefully do... */
}
return (0);
}
int
bus_print_child_header (device_t dev, device_t child)
{
int retval = 0;
if (device_get_desc(child)) {
retval += device_printf(child, "<%s>", device_get_desc(child));
} else {
retval += printf("%s", device_get_nameunit(child));
}
return (retval);
}
int
bus_print_child_footer (device_t dev, device_t child)
{
return (printf(" on %s\n", device_get_nameunit(dev)));
}
int
bus_generic_print_child(device_t dev, device_t child)
{
int retval = 0;
retval += bus_print_child_header(dev, child);
retval += bus_print_child_footer(dev, child);
return (retval);
}
int
bus_generic_read_ivar(device_t dev, device_t child, int index,
uintptr_t * result)
{
return (ENOENT);
}
int
bus_generic_write_ivar(device_t dev, device_t child, int index,
uintptr_t value)
{
return (ENOENT);
}
struct resource_list *
bus_generic_get_resource_list (device_t dev, device_t child)
{
return (NULL);
}
void
bus_generic_driver_added(device_t dev, driver_t *driver)
{
device_t child;
DEVICE_IDENTIFY(driver, dev);
TAILQ_FOREACH(child, &dev->children, link) {
if (child->state == DS_NOTPRESENT)
device_probe_and_attach(child);
}
}
int
bus_generic_setup_intr(device_t dev, device_t child, struct resource *irq,
int flags, driver_intr_t *intr, void *arg, void **cookiep)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_SETUP_INTR(dev->parent, child, irq, flags,
intr, arg, cookiep));
return (EINVAL);
}
int
bus_generic_teardown_intr(device_t dev, device_t child, struct resource *irq,
void *cookie)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_TEARDOWN_INTR(dev->parent, child, irq, cookie));
return (EINVAL);
}
struct resource *
bus_generic_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_ALLOC_RESOURCE(dev->parent, child, type, rid,
start, end, count, flags));
return (NULL);
}
int
bus_generic_release_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_RELEASE_RESOURCE(dev->parent, child, type, rid,
r));
return (EINVAL);
}
int
bus_generic_activate_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_ACTIVATE_RESOURCE(dev->parent, child, type, rid,
r));
return (EINVAL);
}
int
bus_generic_deactivate_resource(device_t dev, device_t child, int type,
int rid, struct resource *r)
{
/* Propagate up the bus hierarchy until someone handles it. */
if (dev->parent)
return (BUS_DEACTIVATE_RESOURCE(dev->parent, child, type, rid,
r));
return (EINVAL);
}
int
bus_generic_rl_get_resource (device_t dev, device_t child, int type, int rid,
u_long *startp, u_long *countp)
{
struct resource_list * rl = NULL;
struct resource_list_entry * rle = NULL;
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (!rl)
return (EINVAL);
rle = resource_list_find(rl, type, rid);
if (!rle)
return (ENOENT);
if (startp)
*startp = rle->start;
if (countp)
*countp = rle->count;
return (0);
}
int
bus_generic_rl_set_resource (device_t dev, device_t child, int type, int rid,
u_long start, u_long count)
{
struct resource_list * rl = NULL;
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (!rl)
return (EINVAL);
resource_list_add(rl, type, rid, start, (start + count - 1), count);
return (0);
}
void
bus_generic_rl_delete_resource (device_t dev, device_t child, int type, int rid)
{
struct resource_list * rl = NULL;
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (!rl)
return;
resource_list_delete(rl, type, rid);
return;
}
int
bus_generic_rl_release_resource (device_t dev, device_t child, int type,
int rid, struct resource *r)
{
struct resource_list * rl = NULL;
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (!rl)
return (EINVAL);
return (resource_list_release(rl, dev, child, type, rid, r));
}
struct resource *
bus_generic_rl_alloc_resource (device_t dev, device_t child, int type,
int *rid, u_long start, u_long end, u_long count, u_int flags)
{
struct resource_list * rl = NULL;
rl = BUS_GET_RESOURCE_LIST(dev, child);
if (!rl)
return (NULL);
return (resource_list_alloc(rl, dev, child, type, rid,
start, end, count, flags));
}
/*
* Some convenience functions to make it easier for drivers to use the
* resource-management functions. All these really do is hide the
* indirection through the parent's method table, making for slightly
* less-wordy code. In the future, it might make sense for this code
* to maintain some sort of a list of resources allocated by each device.
*/
struct resource *
bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end,
u_long count, u_int flags)
{
if (dev->parent == 0)
return (0);
return (BUS_ALLOC_RESOURCE(dev->parent, dev, type, rid, start, end,
count, flags));
}
int
bus_activate_resource(device_t dev, int type, int rid, struct resource *r)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_ACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
}
int
bus_deactivate_resource(device_t dev, int type, int rid, struct resource *r)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_DEACTIVATE_RESOURCE(dev->parent, dev, type, rid, r));
}
int
bus_release_resource(device_t dev, int type, int rid, struct resource *r)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_RELEASE_RESOURCE(dev->parent, dev, type, rid, r));
}
int
bus_setup_intr(device_t dev, struct resource *r, int flags,
driver_intr_t handler, void *arg, void **cookiep)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_SETUP_INTR(dev->parent, dev, r, flags,
handler, arg, cookiep));
}
int
bus_teardown_intr(device_t dev, struct resource *r, void *cookie)
{
if (dev->parent == 0)
return (EINVAL);
return (BUS_TEARDOWN_INTR(dev->parent, dev, r, cookie));
}
int
bus_set_resource(device_t dev, int type, int rid,
u_long start, u_long count)
{
return (BUS_SET_RESOURCE(device_get_parent(dev), dev, type, rid,
start, count));
}
int
bus_get_resource(device_t dev, int type, int rid,
u_long *startp, u_long *countp)
{
return (BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
startp, countp));
}
u_long
bus_get_resource_start(device_t dev, int type, int rid)
{
u_long start, count;
int error;
error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
&start, &count);
if (error)
return (0);
return (start);
}
u_long
bus_get_resource_count(device_t dev, int type, int rid)
{
u_long start, count;
int error;
error = BUS_GET_RESOURCE(device_get_parent(dev), dev, type, rid,
&start, &count);
if (error)
return (0);
return (count);
}
void
bus_delete_resource(device_t dev, int type, int rid)
{
BUS_DELETE_RESOURCE(device_get_parent(dev), dev, type, rid);
}
static int
root_print_child(device_t dev, device_t child)
{
int retval = 0;
retval += bus_print_child_header(dev, child);
retval += printf("\n");
return (retval);
}
static int
root_setup_intr(device_t dev, device_t child, driver_intr_t *intr, void *arg,
void **cookiep)
{
/*
* If an interrupt mapping gets to here something bad has happened.
*/
panic("root_setup_intr");
}
static kobj_method_t root_methods[] = {
/* Device interface */
KOBJMETHOD(device_shutdown, bus_generic_shutdown),
KOBJMETHOD(device_suspend, bus_generic_suspend),
KOBJMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
KOBJMETHOD(bus_print_child, root_print_child),
KOBJMETHOD(bus_read_ivar, bus_generic_read_ivar),
KOBJMETHOD(bus_write_ivar, bus_generic_write_ivar),
KOBJMETHOD(bus_setup_intr, root_setup_intr),
{ 0, 0 }
};
static driver_t root_driver = {
"root",
root_methods,
1, /* no softc */
};
device_t root_bus;
devclass_t root_devclass;
static int
root_bus_module_handler(module_t mod, int what, void* arg)
{
switch (what) {
case MOD_LOAD:
TAILQ_INIT(&bus_data_devices);
kobj_class_compile((kobj_class_t) &root_driver);
root_bus = make_device(NULL, "root", 0);
root_bus->desc = "System root bus";
kobj_init((kobj_t) root_bus, (kobj_class_t) &root_driver);
root_bus->driver = &root_driver;
root_bus->state = DS_ATTACHED;
root_devclass = devclass_find_internal("root", FALSE);
return (0);
case MOD_SHUTDOWN:
device_shutdown(root_bus);
return (0);
}
return (0);
}
static moduledata_t root_bus_mod = {
"rootbus",
root_bus_module_handler,
0
};
DECLARE_MODULE(rootbus, root_bus_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
void
root_bus_configure(void)
{
device_t dev;
PDEBUG(("."));
TAILQ_FOREACH(dev, &root_bus->children, link) {
device_probe_and_attach(dev);
}
}
int
driver_module_handler(module_t mod, int what, void *arg)
{
int error, i;
struct driver_module_data *dmd;
devclass_t bus_devclass;
dmd = (struct driver_module_data *)arg;
bus_devclass = devclass_find_internal(dmd->dmd_busname, TRUE);
error = 0;
switch (what) {
case MOD_LOAD:
if (dmd->dmd_chainevh)
error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
for (i = 0; !error && i < dmd->dmd_ndrivers; i++) {
PDEBUG(("Loading module: driver %s on bus %s",
DRIVERNAME(dmd->dmd_drivers[i]), dmd->dmd_busname));
error = devclass_add_driver(bus_devclass,
dmd->dmd_drivers[i]);
}
if (error)
break;
/*
* The drivers loaded in this way are assumed to all
* implement the same devclass.
*/
*dmd->dmd_devclass =
devclass_find_internal(dmd->dmd_drivers[0]->name, TRUE);
break;
case MOD_UNLOAD:
for (i = 0; !error && i < dmd->dmd_ndrivers; i++) {
PDEBUG(("Unloading module: driver %s from bus %s",
DRIVERNAME(dmd->dmd_drivers[i]),
dmd->dmd_busname));
error = devclass_delete_driver(bus_devclass,
dmd->dmd_drivers[i]);
}
if (!error && dmd->dmd_chainevh)
error = dmd->dmd_chainevh(mod,what,dmd->dmd_chainarg);
break;
}
return (error);
}
#ifdef BUS_DEBUG
/* the _short versions avoid iteration by not calling anything that prints
* more than oneliners. I love oneliners.
*/
static void
print_device_short(device_t dev, int indent)
{
if (!dev)
return;
indentprintf(("device %d: <%s> %sparent,%schildren,%s%s%s%s,%sivars,%ssoftc,busy=%d\n",
dev->unit, dev->desc,
(dev->parent? "":"no "),
(TAILQ_EMPTY(&dev->children)? "no ":""),
(dev->flags&DF_ENABLED? "enabled,":"disabled,"),
(dev->flags&DF_FIXEDCLASS? "fixed,":""),
(dev->flags&DF_WILDCARD? "wildcard,":""),
(dev->flags&DF_DESCMALLOCED? "descmalloced,":""),
(dev->ivars? "":"no "),
(dev->softc? "":"no "),
dev->busy));
}
static void
print_device(device_t dev, int indent)
{
if (!dev)
return;
print_device_short(dev, indent);
indentprintf(("Parent:\n"));
print_device_short(dev->parent, indent+1);
indentprintf(("Driver:\n"));
print_driver_short(dev->driver, indent+1);
indentprintf(("Devclass:\n"));
print_devclass_short(dev->devclass, indent+1);
}
void
print_device_tree_short(device_t dev, int indent)
/* print the device and all its children (indented) */
{
device_t child;
if (!dev)
return;
print_device_short(dev, indent);
TAILQ_FOREACH(child, &dev->children, link) {
print_device_tree_short(child, indent+1);
}
}
void
print_device_tree(device_t dev, int indent)
/* print the device and all its children (indented) */
{
device_t child;
if (!dev)
return;
print_device(dev, indent);
TAILQ_FOREACH(child, &dev->children, link) {
print_device_tree(child, indent+1);
}
}
static void
print_driver_short(driver_t *driver, int indent)
{
if (!driver)
return;
indentprintf(("driver %s: softc size = %d\n",
driver->name, driver->size));
}
static void
print_driver(driver_t *driver, int indent)
{
if (!driver)
return;
print_driver_short(driver, indent);
}
static void
print_driver_list(driver_list_t drivers, int indent)
{
driverlink_t driver;
TAILQ_FOREACH(driver, &drivers, link) {
print_driver(driver->driver, indent);
}
}
static void
print_devclass_short(devclass_t dc, int indent)
{
if ( !dc )
return;
indentprintf(("devclass %s: max units = %d\n", dc->name, dc->maxunit));
}
static void
print_devclass(devclass_t dc, int indent)
{
int i;
if ( !dc )
return;
print_devclass_short(dc, indent);
indentprintf(("Drivers:\n"));
print_driver_list(dc->drivers, indent+1);
indentprintf(("Devices:\n"));
for (i = 0; i < dc->maxunit; i++)
if (dc->devices[i])
print_device(dc->devices[i], indent+1);
}
void
print_devclass_list_short(void)
{
devclass_t dc;
printf("Short listing of devclasses, drivers & devices:\n");
TAILQ_FOREACH(dc, &devclasses, link) {
print_devclass_short(dc, 0);
}
}
void
print_devclass_list(void)
{
devclass_t dc;
printf("Full listing of devclasses, drivers & devices:\n");
TAILQ_FOREACH(dc, &devclasses, link) {
print_devclass(dc, 0);
}
}
#endif
/*
* User-space access to the device tree.
*
* We implement a small set of nodes:
*
* hw.bus Single integer read method to obtain the
* current generation count.
* hw.bus.devices Reads the entire device tree in flat space.
* hw.bus.rman Resource manager interface
*
* We might like to add the ability to scan devclasses and/or drivers to
* determine what else is currently loaded/available.
*/
SYSCTL_NODE(_hw, OID_AUTO, bus, CTLFLAG_RW, NULL, NULL);
static int
sysctl_bus(SYSCTL_HANDLER_ARGS)
{
struct u_businfo ubus;
ubus.ub_version = BUS_USER_VERSION;
ubus.ub_generation = bus_data_generation;
return (SYSCTL_OUT(req, &ubus, sizeof(ubus)));
}
SYSCTL_NODE(_hw_bus, OID_AUTO, info, CTLFLAG_RW, sysctl_bus,
"bus-related data");
static int
sysctl_devices(SYSCTL_HANDLER_ARGS)
{
int *name = (int *)arg1;
u_int namelen = arg2;
int index;
struct device *dev;
struct u_device udev; /* XXX this is a bit big */
int error;
if (namelen != 2)
return (EINVAL);
if (bus_data_generation_check(name[0]))
return (EINVAL);
index = name[1];
/*
* Scan the list of devices, looking for the requested index.
*/
TAILQ_FOREACH(dev, &bus_data_devices, devlink) {
if (index-- == 0)
break;
}
if (dev == NULL)
return (ENOENT);
/*
* Populate the return array.
*/
udev.dv_handle = (uintptr_t)dev;
udev.dv_parent = (uintptr_t)dev->parent;
if (dev->nameunit == NULL) {
udev.dv_name[0] = 0;
} else {
snprintf(udev.dv_name, 32, "%s", dev->nameunit);
}
if (dev->desc == NULL) {
udev.dv_desc[0] = 0;
} else {
snprintf(udev.dv_desc, 32, "%s", dev->desc);
}
if ((dev->driver == NULL) || (dev->driver->name == NULL)) {
udev.dv_drivername[0] = 0;
} else {
snprintf(udev.dv_drivername, 32, "%s", dev->driver->name);
}
error = SYSCTL_OUT(req, &udev, sizeof(udev));
return (error);
}
SYSCTL_NODE(_hw_bus, OID_AUTO, devices, CTLFLAG_RD, sysctl_devices,
"system device tree");
/*
* Sysctl interface for scanning the resource lists.
*
* We take two input parameters; the index into the list of resource
* managers, and the resource offset into the list.
*/
static int
sysctl_rman(SYSCTL_HANDLER_ARGS)
{
int *name = (int *)arg1;
u_int namelen = arg2;
int rman_idx, res_idx;
struct rman *rm;
struct resource *res;
struct u_rman urm;
struct u_resource ures;
int error;
if (namelen != 3)
return (EINVAL);
if (bus_data_generation_check(name[0]))
return (EINVAL);
rman_idx = name[1];
res_idx = name[2];
/*
* Find the indexed resource manager
*/
TAILQ_FOREACH(rm, &rman_head, rm_link) {
if (rman_idx-- == 0)
break;
}
if (rm == NULL)
return (ENOENT);
/*
* If the resource index is -1, we want details on the
* resource manager.
*/
if (res_idx == -1) {
urm.rm_handle = (uintptr_t)rm;
snprintf(urm.rm_descr, RM_TEXTLEN, "%s", rm->rm_descr);
urm.rm_descr[RM_TEXTLEN - 1] = '\0';
urm.rm_start = rm->rm_start;
urm.rm_size = rm->rm_end - rm->rm_start + 1;
urm.rm_type = rm->rm_type;
error = SYSCTL_OUT(req, &urm, sizeof(urm));
return (error);
}
/*
* Find the indexed resource and return it.
*/
TAILQ_FOREACH(res, &rm->rm_list, r_link) {
if (res_idx-- == 0) {
ures.r_handle = (uintptr_t)res;
ures.r_parent = (uintptr_t)res->r_rm;
ures.r_device = (uintptr_t)res->r_dev;
if (res->r_dev != NULL) {
if (device_get_name(res->r_dev) != NULL) {
snprintf(ures.r_devname, RM_TEXTLEN,
"%s%d",
device_get_name(res->r_dev),
device_get_unit(res->r_dev));
} else {
snprintf(ures.r_devname, RM_TEXTLEN,
"nomatch");
}
} else {
ures.r_devname[0] = 0;
}
ures.r_start = res->r_start;
ures.r_size = res->r_end - res->r_start + 1;
ures.r_flags = res->r_flags;
error = SYSCTL_OUT(req, &ures, sizeof(ures));
return (error);
}
}
return (ENOENT);
}
SYSCTL_NODE(_hw_bus, OID_AUTO, rman, CTLFLAG_RD, sysctl_rman,
"kernel resource manager");
int
bus_data_generation_check(int generation)
{
if (generation != bus_data_generation)
return (1);
/* XXX generate optimised lists here? */
return (0);
}
void
bus_data_generation_update(void)
{
bus_data_generation++;
}
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