485cde8df8
This adds it to devctl, libdevctl, defines the two IOCTLs and implements the kernel bits. causes any new drivers that are added via kldload to be deferred until a 'thaw' comes in. These do not stack: it is an error to freeze while frozen, or thaw while thawed. Differential Revision: https://reviews.freebsd.org/D16735
162 lines
3.7 KiB
C
162 lines
3.7 KiB
C
/*-
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* Copyright (c) 2014 John Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/bus.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include "devctl.h"
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static int
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devctl_request(u_long cmd, struct devreq *req)
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{
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static int devctl2_fd = -1;
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if (devctl2_fd == -1) {
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devctl2_fd = open("/dev/devctl2", O_RDONLY);
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if (devctl2_fd == -1)
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return (-1);
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}
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return (ioctl(devctl2_fd, cmd, req));
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}
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static int
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devctl_simple_request(u_long cmd, const char *name, int flags)
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{
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struct devreq req;
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memset(&req, 0, sizeof(req));
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if (strlcpy(req.dr_name, name, sizeof(req.dr_name)) >=
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sizeof(req.dr_name)) {
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errno = EINVAL;
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return (-1);
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}
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req.dr_flags = flags;
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return (devctl_request(cmd, &req));
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}
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int
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devctl_attach(const char *device)
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{
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return (devctl_simple_request(DEV_ATTACH, device, 0));
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}
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int
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devctl_detach(const char *device, bool force)
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{
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return (devctl_simple_request(DEV_DETACH, device, force ?
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DEVF_FORCE_DETACH : 0));
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}
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int
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devctl_enable(const char *device)
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{
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return (devctl_simple_request(DEV_ENABLE, device, 0));
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}
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int
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devctl_disable(const char *device, bool force_detach)
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{
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return (devctl_simple_request(DEV_DISABLE, device, force_detach ?
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DEVF_FORCE_DETACH : 0));
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}
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int
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devctl_suspend(const char *device)
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{
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return (devctl_simple_request(DEV_SUSPEND, device, 0));
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}
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int
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devctl_resume(const char *device)
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{
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return (devctl_simple_request(DEV_RESUME, device, 0));
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}
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int
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devctl_set_driver(const char *device, const char *driver, bool force)
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{
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struct devreq req;
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memset(&req, 0, sizeof(req));
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if (strlcpy(req.dr_name, device, sizeof(req.dr_name)) >=
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sizeof(req.dr_name)) {
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errno = EINVAL;
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return (-1);
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}
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req.dr_data = __DECONST(char *, driver);
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if (force)
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req.dr_flags |= DEVF_SET_DRIVER_DETACH;
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return (devctl_request(DEV_SET_DRIVER, &req));
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}
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int
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devctl_clear_driver(const char *device, bool force)
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{
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return (devctl_simple_request(DEV_CLEAR_DRIVER, device, force ?
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DEVF_CLEAR_DRIVER_DETACH : 0));
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}
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int
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devctl_rescan(const char *device)
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{
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return (devctl_simple_request(DEV_RESCAN, device, 0));
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}
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int
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devctl_delete(const char *device, bool force)
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{
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return (devctl_simple_request(DEV_DELETE, device, force ?
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DEVF_FORCE_DELETE : 0));
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}
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int
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devctl_freeze(void)
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{
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return (devctl_simple_request(DEV_FREEZE, "", 0));
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}
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int
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devctl_thaw(void)
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{
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return (devctl_simple_request(DEV_THAW, "", 0));
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}
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