Date: Mon, 29 Aug 2016 15:57:14 -0700 From: John Baldwin <jhb@freebsd.org> To: src-committers@freebsd.org Cc: svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r305034 - in head: lib/libdevctl sys/kern sys/sys usr.sbin/devctl Message-ID: <8074036.gWSGr9DhZh@ralph.baldwin.cx> In-Reply-To: <201608292248.u7TMmaEe050646@repo.freebsd.org> References: <201608292248.u7TMmaEe050646@repo.freebsd.org>
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On Monday, August 29, 2016 10:48:36 PM John Baldwin wrote: > 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 In particular, you can now do 'devctl set driver pciX:Y:Z ppt' to flip a device into pass through mode for bhyve and then use 'devctl clear driver pciX:Y:Z' to revert back to the host driver. Though for bhyve/ppt(4) in particular you need some additional changes currently under review so that the device ends up back in the proper I/O MMU domain so it can do DMA in the host. -- John Baldwin
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