freebsd-dev/lib/libdevctl/devctl.c

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Add a new device control utility for new-bus devices called devctl. This allows the user to request administrative changes to individual devices such as attach or detaching drivers or disabling and re-enabling devices. - Add a new /dev/devctl2 character device which uses ioctls for device requests. The ioctls use a common 'struct devreq' which is somewhat similar to 'struct ifreq'. - The ioctls identify the device to operate on via a string. This string can either by the device's name, or it can be a bus-specific address. (For unattached devices, a bus address is the only way to locate a device.) Bus drivers register an eventhandler to claim unrecognized device names that the driver recognizes as a valid address. Two buses currently support addresses: ACPI recognizes any device in the ACPI namespace via its full path starting with "\" and the PCI bus driver recognizes an address specification of 'pci[<domain>:]<bus>:<slot>:<func>' (identical to the PCI selector strings supported by pciconf). - To make it easier to cut and paste, change the PnP location string in the PCI bus driver to output a full PCI selector string rather than 'slot=<slot> function=<func>'. - Add a devctl(3) interface in libdevctl which provides a wrapper around the ioctls and is the preferred interface for other userland code. - Add a devctl(8) program which is a simple wrapper around the requests supported by devctl(3). - Add a device_is_suspended() function to check DF_SUSPENDED. - Add a resource_unset_value() function that can be used to remove a hint from the kernel environment. This is used to clear a hint.<driver>.<unit>.disabled hint when re-enabling a boot-time disabled device. Reviewed by: imp (parts) Requested by: imp (changing PCI location string) Relnotes: yes
2015-02-06 16:09:01 +00:00
/*-
* Copyright (c) 2014 John Baldwin <jhb@FreeBSD.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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/bus.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include "devctl.h"
static int
devctl_request(u_long cmd, struct devreq *req)
{
static int devctl2_fd = -1;
if (devctl2_fd == -1) {
devctl2_fd = open("/dev/devctl2", O_RDONLY);
if (devctl2_fd == -1)
return (-1);
}
return (ioctl(devctl2_fd, cmd, req));
}
static int
devctl_simple_request(u_long cmd, const char *name, int flags)
{
struct devreq req;
memset(&req, 0, sizeof(req));
if (strlcpy(req.dr_name, name, sizeof(req.dr_name)) >=
sizeof(req.dr_name)) {
errno = EINVAL;
return (-1);
}
req.dr_flags = flags;
return (devctl_request(cmd, &req));
}
int
devctl_attach(const char *device)
{
return (devctl_simple_request(DEV_ATTACH, device, 0));
}
int
devctl_detach(const char *device, bool force)
{
return (devctl_simple_request(DEV_DETACH, device, force ?
DEVF_FORCE_DETACH : 0));
}
int
devctl_enable(const char *device)
{
return (devctl_simple_request(DEV_ENABLE, device, 0));
}
int
devctl_disable(const char *device, bool force_detach)
{
return (devctl_simple_request(DEV_DISABLE, device, force_detach ?
DEVF_FORCE_DETACH : 0));
}
int
devctl_suspend(const char *device)
{
return (devctl_simple_request(DEV_SUSPEND, device, 0));
}
int
devctl_resume(const char *device)
{
return (devctl_simple_request(DEV_RESUME, device, 0));
}
int
devctl_set_driver(const char *device, const char *driver, bool force)
{
struct devreq req;
memset(&req, 0, sizeof(req));
if (strlcpy(req.dr_name, device, sizeof(req.dr_name)) >=
sizeof(req.dr_name)) {
errno = EINVAL;
return (-1);
}
req.dr_data = __DECONST(char *, driver);
if (force)
req.dr_flags |= DEVF_SET_DRIVER_DETACH;
return (devctl_request(DEV_SET_DRIVER, &req));
}
int
devctl_clear_driver(const char *device, bool force)
{
return (devctl_simple_request(DEV_CLEAR_DRIVER, device, force ?
DEVF_CLEAR_DRIVER_DETACH : 0));
}
int
devctl_rescan(const char *device)
{
return (devctl_simple_request(DEV_RESCAN, device, 0));
}
int
devctl_delete(const char *device, bool force)
{
return (devctl_simple_request(DEV_DELETE, device, force ?
DEVF_FORCE_DELETE : 0));
}