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Add DEV_RESET /dev/devctl2 ioctl.

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It performs BUS_RESET_CHILD() on the parental bus and the specified
device.

Reviewed by:	imp (previous version), jhb (previous version)
Sponsored by:	Mellanox Technologies
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D19646
This commit is contained in:
Konstantin Belousov 2019-04-05 19:31:26 +00:00
parent 7f755050f7
commit 1d1a5c2b02
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345965
2 changed files with 10 additions and 0 deletions
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9
sys/kern/subr_bus.c
View File

@ -5646,6 +5646,7 @@ devctl2_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
case DEV_CLEAR_DRIVER:
case DEV_RESCAN:
case DEV_DELETE:
case DEV_RESET:
error = priv_check(td, PRIV_DRIVER);
if (error == 0)
error = find_device(req, &dev);
@ -5871,6 +5872,14 @@ devctl2_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
device_frozen = false;
}
break;
case DEV_RESET:
if ((req->dr_flags & ~(DEVF_RESET_DETACH)) != 0) {
error = EINVAL;
break;
}
error = BUS_RESET_CHILD(device_get_parent(dev), dev,
req->dr_flags);
break;
}
mtx_unlock(&Giant);
return (error);

1
sys/sys/bus.h
View File

@ -130,6 +130,7 @@ struct devreq {
#define DEV_DELETE _IOW('D', 10, struct devreq)
#define DEV_FREEZE _IOW('D', 11, struct devreq)
#define DEV_THAW _IOW('D', 12, struct devreq)
#define DEV_RESET _IOW('D', 13, struct devreq)
/* Flags for DEV_DETACH and DEV_DISABLE. */
#define DEVF_FORCE_DETACH 0x0000001