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/* $OpenBSD: bio.c,v 1.19 2023/11/15 23:57:45 dlg Exp $ */
/*
* Copyright (c) 2002 Niklas Hallqvist. All rights reserved.
* Copyright (c) 2012 Joel Sing <jsing@openbsd.org>. 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 ``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.
*/
/* A device controller ioctl tunnelling device. */
#include <sys/param.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/tree.h>
#include <sys/systm.h>
#include <dev/biovar.h>
struct bio_mapping {
RBT_ENTRY(bio_mapping) bm_link;
uintptr_t bm_cookie;
struct device *bm_dev;
int (*bm_ioctl)(struct device *, u_long, caddr_t);
};
RBT_HEAD(bio_mappings, bio_mapping);
static inline int
bio_cookie_cmp(const struct bio_mapping *a, const struct bio_mapping *b)
{
if (a->bm_cookie < b->bm_cookie)
return (1);
if (a->bm_cookie > b->bm_cookie)
return (-1);
return (0);
}
RBT_PROTOTYPE(bio_mappings, bio_mapping, bm_link, bio_cookie_cmp);
struct bio_mappings bios = RBT_INITIALIZER();
void bioattach(int);
int bioclose(dev_t, int, int, struct proc *);
int bioioctl(dev_t, u_long, caddr_t, int, struct proc *);
int bioopen(dev_t, int, int, struct proc *);
int bio_delegate_ioctl(struct bio_mapping *, u_long, caddr_t);
struct bio_mapping *bio_lookup(char *);
struct bio_mapping *bio_validate(void *);
void
bioattach(int nunits)
{
}
int
bioopen(dev_t dev, int flags, int mode, struct proc *p)
{
return (0);
}
int
bioclose(dev_t dev, int flags, int mode, struct proc *p)
{
return (0);
}
int
bioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
struct bio_mapping *bm;
struct bio_locate *locate;
struct bio *bio;
char name[16];
int error;
switch (cmd) {
case BIOCLOCATE:
locate = (struct bio_locate *)addr;
error = copyinstr(locate->bl_name, name, sizeof name, NULL);
if (error != 0)
return (error);
bm = bio_lookup(name);
if (bm == NULL)
return (ENOENT);
locate->bl_bio.bio_cookie = (void *)bm->bm_cookie;
break;
default:
bio = (struct bio *)addr;
bm = bio_validate(bio->bio_cookie);
if (bm == NULL)
return (ENOENT);
error = bio_delegate_ioctl(bm, cmd, addr);
break;
}
return (0);
}
int
bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, caddr_t))
{
struct bio_mapping *bm;
bm = malloc(sizeof *bm, M_DEVBUF, M_NOWAIT);
if (bm == NULL)
return (ENOMEM);
bm->bm_dev = dev;
bm->bm_ioctl = ioctl;
do {
bm->bm_cookie = arc4random();
/* lets hope we don't have 4 billion bio_registers */
} while (RBT_INSERT(bio_mappings, &bios, bm) != NULL);
return (0);
}
void
bio_unregister(struct device *dev)
{
struct bio_mapping *bm, *next;
RBT_FOREACH_SAFE(bm, bio_mappings, &bios, next) {
if (dev == bm->bm_dev) {
RBT_REMOVE(bio_mappings, &bios, bm);
free(bm, M_DEVBUF, sizeof(*bm));
}
}
}
struct bio_mapping *
bio_lookup(char *name)
{
struct bio_mapping *bm;
RBT_FOREACH(bm, bio_mappings, &bios) {
if (strcmp(name, bm->bm_dev->dv_xname) == 0)
return (bm);
}
return (NULL);
}
struct bio_mapping *
bio_validate(void *cookie)
{
struct bio_mapping key = { .bm_cookie = (uintptr_t)cookie };
return (RBT_FIND(bio_mappings, &bios, &key));
}
int
bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, caddr_t addr)
{
return (bm->bm_ioctl(bm->bm_dev, cmd, addr));
}
void
bio_info(struct bio_status *bs, int print, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
bio_status(bs, print, BIO_MSG_INFO, fmt, &ap);
va_end(ap);
}
void
bio_warn(struct bio_status *bs, int print, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
bio_status(bs, print, BIO_MSG_WARN, fmt, &ap);
va_end(ap);
}
void
bio_error(struct bio_status *bs, int print, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
bio_status(bs, print, BIO_MSG_ERROR, fmt, &ap);
va_end(ap);
}
void
bio_status_init(struct bio_status *bs, struct device *dv)
{
bzero(bs, sizeof(struct bio_status));
bs->bs_status = BIO_STATUS_UNKNOWN;
strlcpy(bs->bs_controller, dv->dv_xname, sizeof(bs->bs_controller));
}
void
bio_status(struct bio_status *bs, int print, int msg_type, const char *fmt,
va_list *ap)
{
int idx;
if (bs->bs_msg_count >= BIO_MSG_COUNT) {
printf("%s: insufficient message buffers\n", bs->bs_controller);
return;
}
idx = bs->bs_msg_count++;
bs->bs_msgs[idx].bm_type = msg_type;
vsnprintf(bs->bs_msgs[idx].bm_msg, BIO_MSG_LEN, fmt, *ap);
if (print)
printf("%s: %s\n", bs->bs_controller, bs->bs_msgs[idx].bm_msg);
}
RBT_GENERATE(bio_mappings, bio_mapping, bm_link, bio_cookie_cmp);
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