Author: jhb Date: Mon Aug 29 22:48:36 2016 New Revision: 305034 URL: https://svnweb.freebsd.org/changeset/base/305034
Log: Implement 'devctl clear driver' to undo a previous 'devctl set driver'. Add a new 'clear driver' command for devctl along with the accompanying ioctl and devctl_clear_driver() library routine to reset a device to use a wildcard devclass instead of a fixed devclass. This can be used to undo a previous 'set driver' command. After the device's name has been reset to permit wildcard names, it is reprobed so that it can attach to newly-available (to it) device drivers. MFC after: 1 month Sponsored by: Chelsio Communications 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 Mon Aug 29 22:47:53 2016 (r305033) +++ head/lib/libdevctl/devctl.3 Mon Aug 29 22:48:36 2016 (r305034) @@ -25,12 +25,13 @@ .\" .\" $FreeBSD$ .\" -.Dd April 27, 2016 +.Dd August 29, 2016 .Dt DEVCTL 3 .Os .Sh NAME .Nm devctl , .Nm devctl_attach , +.Nm devctl_clear_driver , .Nm devctl_delete , .Nm devctl_detach , .Nm devctl_disable , @@ -47,6 +48,8 @@ .Ft int .Fn devctl_attach "const char *device" .Ft int +.Fn devctl_clear_driver "const char *device" "bool force" +.Ft int .Fn devctl_delete "const char *device" "bool force" .Ft int .Fn devctl_detach "const char *device" "bool force" @@ -166,12 +169,30 @@ the device will be detached from its cur attached to the new device driver. .Pp The +.Fn devctl_clear_driver +function resets a device so that it can be attached to any valid device +driver rather than only drivers with a previously specified name. +This function is used to undo a previous call to +.Fn devctl_set_driver . +If the device is already attached and +.Fa force +is false, +the request will fail. +If the device is already attached and +.Fa force +is true, +the device will be detached from its current device driver. +After the device's name is reset, +it is reprobed and attached to a suitable device driver if one is found. +.Pp +The .Fn devctl_rescan function rescans a bus device checking for devices that have been added or removed. .Sh RETURN VALUES -.Rv -std devctl_attach devctl_delete devctl_detach devctl_disable \ -devctl_enable devctl_suspend devctl_rescan devctl_resume devctl_set_driver +.Rv -std devctl_attach devctl_clear_driver 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 @@ -302,6 +323,24 @@ The new device driver failed to attach. .El .Pp The +.Fn devctl_clear_driver +function may fail if: +.Bl -tag -width Er +.It Bq Er EBUSY +The device is currently attached to a device driver and +.Fa force +is false. +.It Bq Er EBUSY +The current device driver for +.Fa device +is busy and cannot detach at this time. +.It Bq Er EINVAL +The device is not configured for a specific device driver name. +.It Bq Er ENXIO +The device driver chosen after reprobing failed to attach. +.El +.Pp +The .Fn devctl_rescan function may fail if: .Bl -tag -width Er Modified: head/lib/libdevctl/devctl.c ============================================================================== --- head/lib/libdevctl/devctl.c Mon Aug 29 22:47:53 2016 (r305033) +++ head/lib/libdevctl/devctl.c Mon Aug 29 22:48:36 2016 (r305034) @@ -124,6 +124,14 @@ devctl_set_driver(const char *device, co } 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) { Modified: head/lib/libdevctl/devctl.h ============================================================================== --- head/lib/libdevctl/devctl.h Mon Aug 29 22:47:53 2016 (r305033) +++ head/lib/libdevctl/devctl.h Mon Aug 29 22:48:36 2016 (r305034) @@ -38,6 +38,7 @@ int devctl_disable(const char *device, b 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_clear_driver(const char *device, bool force); int devctl_rescan(const char *device); int devctl_delete(const char *device, bool force); Modified: head/sys/kern/subr_bus.c ============================================================================== --- head/sys/kern/subr_bus.c Mon Aug 29 22:47:53 2016 (r305033) +++ head/sys/kern/subr_bus.c Mon Aug 29 22:48:36 2016 (r305034) @@ -5349,6 +5349,7 @@ devctl2_ioctl(struct cdev *cdev, u_long case DEV_SUSPEND: case DEV_RESUME: case DEV_SET_DRIVER: + case DEV_CLEAR_DRIVER: case DEV_RESCAN: case DEV_DELETE: error = priv_check(td, PRIV_DRIVER); @@ -5514,6 +5515,25 @@ devctl2_ioctl(struct cdev *cdev, u_long error = device_probe_and_attach(dev); break; } + case DEV_CLEAR_DRIVER: + if (!(dev->flags & DF_FIXEDCLASS)) { + error = 0; + break; + } + if (device_is_attached(dev)) { + if (req->dr_flags & DEVF_CLEAR_DRIVER_DETACH) + error = device_detach(dev); + else + error = EBUSY; + if (error) + break; + } + + dev->flags &= ~DF_FIXEDCLASS; + dev->flags |= DF_WILDCARD; + devclass_delete_device(dev->devclass, dev); + error = device_probe_and_attach(dev); + break; case DEV_RESCAN: if (!device_is_attached(dev)) { error = ENXIO; Modified: head/sys/sys/bus.h ============================================================================== --- head/sys/sys/bus.h Mon Aug 29 22:47:53 2016 (r305033) +++ head/sys/sys/bus.h Mon Aug 29 22:48:36 2016 (r305034) @@ -117,6 +117,7 @@ struct devreq { #define DEV_SUSPEND _IOW('D', 5, struct devreq) #define DEV_RESUME _IOW('D', 6, struct devreq) #define DEV_SET_DRIVER _IOW('D', 7, struct devreq) +#define DEV_CLEAR_DRIVER _IOW('D', 8, struct devreq) #define DEV_RESCAN _IOW('D', 9, struct devreq) #define DEV_DELETE _IOW('D', 10, struct devreq) @@ -126,6 +127,9 @@ struct devreq { /* Flags for DEV_SET_DRIVER. */ #define DEVF_SET_DRIVER_DETACH 0x0000001 /* Detach existing driver. */ +/* Flags for DEV_CLEAR_DRIVER. */ +#define DEVF_CLEAR_DRIVER_DETACH 0x0000001 /* Detach existing driver. */ + /* Flags for DEV_DELETE. */ #define DEVF_FORCE_DELETE 0x0000001 Modified: head/usr.sbin/devctl/devctl.8 ============================================================================== --- head/usr.sbin/devctl/devctl.8 Mon Aug 29 22:47:53 2016 (r305033) +++ head/usr.sbin/devctl/devctl.8 Mon Aug 29 22:48:36 2016 (r305034) @@ -25,7 +25,7 @@ .\" .\" $FreeBSD$ .\" -.Dd April 27, 2016 +.Dd August 29, 2016 .Dt DEVCTL 8 .Os .Sh NAME @@ -36,6 +36,10 @@ .Cm attach .Ar device .Nm +.Cm clear driver +.Op Fl f +.Ar device +.Nm .Cm detach .Op Fl f .Ar device @@ -133,6 +137,21 @@ If the device is already attached to a d .Fl f flag is not specified, the device will not be changed. +.It Xo Cm clear driver +.Op Fl f +.Ar device +.Xc +Clear a previously-forced driver name so that the device is able to use any +valid device driver. +After the previous name has been cleared, +the device is reprobed so that other device drivers may attach to it. +This can be used to undo an earlier +.Cm set driver +command. +If the device is currently attached to a device driver and the +.Fl f +flag is not specified, +the device will not be changed. .It Cm rescan Ar device Rescan a bus device checking for devices that have been added or removed. Modified: head/usr.sbin/devctl/devctl.c ============================================================================== --- head/usr.sbin/devctl/devctl.c Mon Aug 29 22:47:53 2016 (r305033) +++ head/usr.sbin/devctl/devctl.c Mon Aug 29 22:48:36 2016 (r305034) @@ -65,12 +65,13 @@ static int devctl_table_handler(struct d SET_DECLARE(DEVCTL_DATASET(top), struct devctl_command); +DEVCTL_TABLE(top, clear); DEVCTL_TABLE(top, set); static void usage(void) { - fprintf(stderr, "%s\n%s\n%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%s\n", "usage: devctl attach device", " devctl detach [-f] device", " devctl disable [-f] device", @@ -78,6 +79,7 @@ usage(void) " devctl suspend device", " devctl resume device", " devctl set driver [-f] device driver", + " devctl clear driver [-f] device", " devctl rescan device", " devctl delete [-f] device"); exit(1); @@ -261,6 +263,40 @@ set_driver(int ac, char **av) } DEVCTL_COMMAND(set, driver, set_driver); +static void +clear_driver_usage(void) +{ + + fprintf(stderr, "usage: devctl clear driver [-f] device\n"); + exit(1); +} + +static int +clear_driver(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: + clear_driver_usage(); + } + ac -= optind; + av += optind; + + if (ac != 1) + clear_driver_usage(); + if (devctl_clear_driver(av[0], force) < 0) + err(1, "Failed to clear %s driver", av[0]); + return (0); +} +DEVCTL_COMMAND(clear, driver, clear_driver); + static int rescan(int ac, char **av) { _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"