Date: Wed, 7 Jan 2015 22:17:50 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: John Baldwin <jhb@freebsd.org> Cc: arch@freebsd.org Subject: Re: devctl(8): A device control utility Message-ID: <20150107181750.GB5588@zxy.spb.ru> In-Reply-To: <3200196.9ZgXApgRdA@ralph.baldwin.cx> References: <3200196.9ZgXApgRdA@ralph.baldwin.cx>
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On Mon, Jan 05, 2015 at 03:01:00PM -0500, John Baldwin wrote: > For a long time I've wanted a way to administratively manipulate the state of > new-bus devices from userland. I think the first use case I wanted was a way > to power off the sound controller (and anything else I wasn't using) on my > first laptop (a Dell Inspiron 5000e I got back in 2000). Similarly, it would > be nice to have a way to handle "ejectable" devices (ACPI has a provision for > this, and said laptop had _EJx methods to allow one to swap a CD drive out for > a battery in a bay while the laptop was in S3). There are some other use > cases that would also be nice such as detaching a driver from a PCI device to > decide at runtime that it should be passed through to a bhyve guest (and > possibly undoing that to allow a host driver to take it back over). Forcing a > rescan of a PCI device can be useful if you are using an FPGA and would like > to alter BAR layout/sizes without having to reboot the OS. A way to force > resets at runtime might also be useful (e.g. a FLR for a PCI device). A few > weeks ago I finally sat down and started on an implementation. It can be > found here: > > https://github.com/bsdjhb/freebsd/compare/devctl > > Sample commands look like: > > % devctl disable virtio_pci2 > > # detaches the driver, but leaves the device's name intact similar to > # specifying hint.virtio_pci.2.disabled=1 at boot > > % devctl enable virtio_pci2 > > # enables a disabled device, including attaching it > > % devctl detach uart1 > > # does a full detach, which means the device is now unnamed Can be now this device used for VirtualBox USB passthrough?
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