svn commit: r298709 - in head: lib/libdevctl sys/kern sys/sys usr.sbin/devctl
John Baldwin
jhb at FreeBSD.org
Wed Apr 27 16:33:19 UTC 2016
Author: jhb
Date: Wed Apr 27 16:33:17 2016
New Revision: 298709
URL: https://svnweb.freebsd.org/changeset/base/298709
Log:
Add 'devctl delete' that calls device_delete_child().
'devctl delete' can be used to delete a device that is no longer present.
As an anti-foot-shooting measure, 'delete' will not delete a device
unless it's parent bus says it is no longer present. This can be
overridden by passing the force ('-f') flag.
Note that this command should be used with care. If a device is deleted
that is actually present it can't be resurrected unless the parent bus
device's driver supports rescans.
Differential Revision: https://reviews.freebsd.org/D6019
Modified:
head/lib/libdevctl/devctl.3
head/lib/libdevctl/devctl.c
head/lib/libdevctl/devctl.h
head/sys/kern/subr_bus.c
head/sys/sys/bus.h
head/usr.sbin/devctl/devctl.8
head/usr.sbin/devctl/devctl.c
Modified: head/lib/libdevctl/devctl.3
==============================================================================
--- head/lib/libdevctl/devctl.3 Wed Apr 27 16:31:12 2016 (r298708)
+++ head/lib/libdevctl/devctl.3 Wed Apr 27 16:33:17 2016 (r298709)
@@ -31,6 +31,7 @@
.Sh NAME
.Nm devctl ,
.Nm devctl_attach ,
+.Nm devctl_delete ,
.Nm devctl_detach ,
.Nm devctl_disable ,
.Nm devctl_enable ,
@@ -46,6 +47,8 @@
.Ft int
.Fn devctl_attach "const char *device"
.Ft int
+.Fn devctl_delete "const char *device" "bool force"
+.Ft int
.Fn devctl_detach "const char *device" "bool force"
.Ft int
.Fn devctl_disable "const char *device" "bool force_detach"
@@ -110,6 +113,15 @@ is true,
the current device driver will be detached even if the device is busy.
.Pp
The
+.Fn devctl_delete
+function deletes a device from the device tree.
+No
+If
+.Fa force
+is true,
+the device is deleted even if the device is physically present.
+.Pp
+The
.Fn devctl_disable
function disables a device.
If the device is currently attached to a device driver,
@@ -158,8 +170,8 @@ The
function rescans a bus device checking for devices that have been added or
removed.
.Sh RETURN VALUES
-.Rv -std devctl_attach devctl_detach devctl_disable devctl_enable \
-devctl_suspend devctl_rescan devctl_resume devctl_set_driver
+.Rv -std devctl_attach devctl_delete devctl_detach devctl_disable \
+devctl_enable devctl_suspend devctl_rescan devctl_resume devctl_set_driver
.Sh ERRORS
In addition to specific errors noted below,
all of the
@@ -298,6 +310,19 @@ The device is not attached to a driver.
.It Bq Er ENXIO
The bus driver does not support rescanning.
.El
+.Pp
+The
+.Fn devctl_delete
+function may fail if:
+.Bl -tag -width Er
+.It Bq Er EBUSY
+The device is physically present and
+.Fa force
+is false.
+.It Bq Er EINVAL
+.Fa dev
+is the root device of the device tree.
+.El
.Sh SEE ALSO
.Xr devinfo 3 ,
.Xr devstat 3 ,
Modified: head/lib/libdevctl/devctl.c
==============================================================================
--- head/lib/libdevctl/devctl.c Wed Apr 27 16:31:12 2016 (r298708)
+++ head/lib/libdevctl/devctl.c Wed Apr 27 16:33:17 2016 (r298709)
@@ -129,3 +129,11 @@ 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));
+}
Modified: head/lib/libdevctl/devctl.h
==============================================================================
--- head/lib/libdevctl/devctl.h Wed Apr 27 16:31:12 2016 (r298708)
+++ head/lib/libdevctl/devctl.h Wed Apr 27 16:33:17 2016 (r298709)
@@ -39,5 +39,6 @@ int devctl_suspend(const char *device);
int devctl_resume(const char *device);
int devctl_set_driver(const char *device, const char *driver, bool force);
int devctl_rescan(const char *device);
+int devctl_delete(const char *device, bool force);
#endif /* !__DEVCTL_H__ */
Modified: head/sys/kern/subr_bus.c
==============================================================================
--- head/sys/kern/subr_bus.c Wed Apr 27 16:31:12 2016 (r298708)
+++ head/sys/kern/subr_bus.c Wed Apr 27 16:33:17 2016 (r298709)
@@ -5204,6 +5204,7 @@ devctl2_ioctl(struct cdev *cdev, u_long
case DEV_RESUME:
case DEV_SET_DRIVER:
case DEV_RESCAN:
+ case DEV_DELETE:
error = priv_check(td, PRIV_DRIVER);
if (error == 0)
error = find_device(req, &dev);
@@ -5374,6 +5375,24 @@ devctl2_ioctl(struct cdev *cdev, u_long
}
error = BUS_RESCAN(dev);
break;
+ case DEV_DELETE: {
+ device_t parent;
+
+ parent = device_get_parent(dev);
+ if (parent == NULL) {
+ error = EINVAL;
+ break;
+ }
+ if (!(req->dr_flags & DEVF_FORCE_DELETE)) {
+ if (bus_child_present(dev) != 0) {
+ error = EBUSY;
+ break;
+ }
+ }
+
+ error = device_delete_child(parent, dev);
+ break;
+ }
}
mtx_unlock(&Giant);
return (error);
Modified: head/sys/sys/bus.h
==============================================================================
--- head/sys/sys/bus.h Wed Apr 27 16:31:12 2016 (r298708)
+++ head/sys/sys/bus.h Wed Apr 27 16:33:17 2016 (r298709)
@@ -118,6 +118,7 @@ struct devreq {
#define DEV_RESUME _IOW('D', 6, struct devreq)
#define DEV_SET_DRIVER _IOW('D', 7, struct devreq)
#define DEV_RESCAN _IOW('D', 9, struct devreq)
+#define DEV_DELETE _IOW('D', 10, struct devreq)
/* Flags for DEV_DETACH and DEV_DISABLE. */
#define DEVF_FORCE_DETACH 0x0000001
@@ -125,6 +126,9 @@ struct devreq {
/* Flags for DEV_SET_DRIVER. */
#define DEVF_SET_DRIVER_DETACH 0x0000001 /* Detach existing driver. */
+/* Flags for DEV_DELETE. */
+#define DEVF_FORCE_DELETE 0x0000001
+
#ifdef _KERNEL
#include <sys/eventhandler.h>
Modified: head/usr.sbin/devctl/devctl.8
==============================================================================
--- head/usr.sbin/devctl/devctl.8 Wed Apr 27 16:31:12 2016 (r298708)
+++ head/usr.sbin/devctl/devctl.8 Wed Apr 27 16:33:17 2016 (r298709)
@@ -59,6 +59,10 @@
.Nm
.Cm rescan
.Ar device
+.Nm
+.Cm delete
+.Op Fl f
+.Ar device
.Sh DESCRIPTION
The
.Nm
@@ -132,6 +136,18 @@ the device will not be changed.
.It Cm rescan Ar device
Rescan a bus device checking for devices that have been added or
removed.
+.It Xo Cm delete
+.Op Fl
+.Ar device
+.Xc
+Delete the device from the device tree.
+If the
+.Fl f
+flag is specified,
+the device will be deleted even if it is physically present.
+This command should be used with care as a device that is deleted but present
+can no longer be used unless the parent bus device rediscovers the device via
+a rescan request.
.El
.Sh SEE ALSO
.Xr devctl 3 ,
Modified: head/usr.sbin/devctl/devctl.c
==============================================================================
--- head/usr.sbin/devctl/devctl.c Wed Apr 27 16:31:12 2016 (r298708)
+++ head/usr.sbin/devctl/devctl.c Wed Apr 27 16:33:17 2016 (r298709)
@@ -70,14 +70,16 @@ DEVCTL_TABLE(top, set);
static void
usage(void)
{
- fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
+ fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
"usage: devctl attach device",
" devctl detach [-f] device",
" devctl disable [-f] device",
" devctl enable device",
" devctl suspend device",
" devctl resume device",
- " devctl set driver [-f] device driver");
+ " devctl set driver [-f] device driver",
+ " devctl rescan device",
+ " devctl delete [-f] device");
exit(1);
}
@@ -271,6 +273,40 @@ rescan(int ac, char **av)
}
DEVCTL_COMMAND(top, rescan, rescan);
+static void
+delete_usage(void)
+{
+
+ fprintf(stderr, "usage: devctl delete [-f] device\n");
+ exit(1);
+}
+
+static int
+delete(int ac, char **av)
+{
+ bool force;
+ int ch;
+
+ force = false;
+ while ((ch = getopt(ac, av, "f")) != -1)
+ switch (ch) {
+ case 'f':
+ force = true;
+ break;
+ default:
+ delete_usage();
+ }
+ ac -= optind;
+ av += optind;
+
+ if (ac != 1)
+ delete_usage();
+ if (devctl_delete(av[0], force) < 0)
+ err(1, "Failed to delete %s", av[0]);
+ return (0);
+}
+DEVCTL_COMMAND(top, delete, delete);
+
int
main(int ac, char *av[])
{
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