On Wed, 10 Jan 2018 17:42:56 +0100 Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Jan 09, 2018 at 12:57:33PM -0800, Stephen Hemminger wrote: > > Use sysfs to allow supporting sub-channels. The userspace application > > makes request to host to create sub-channels and the UIO kernel > > driver populates the sysfs per-channel directory with a binary > > attribute file that can be used to read/write ring. > > > > Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> > > --- > > Documentation/driver-api/uio-howto.rst | 5 ++ > > drivers/uio/uio_hv_generic.c | 95 ++++++++++++++++++++++++++++++++-- > > 2 files changed, 97 insertions(+), 3 deletions(-) > > > > diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst > > index 693e3bd84e79..7d36a50c0484 100644 > > --- a/Documentation/driver-api/uio-howto.rst > > +++ b/Documentation/driver-api/uio-howto.rst > > @@ -709,6 +709,11 @@ The vmbus device regions are mapped into uio device resources: > > 3) Network receive buffer region > > 4) Network send buffer region > > > > +If a subchannel is created by a request to host, then the uio_hv_generic > > +device driver will create a sysfs binary file for the per-channel ring buffer. > > +For example: > > + /sys/bus/vmbus/devices/3811fe4d-0fa0-4b62-981a-74fc1084c757/channels/21/ring_buffer > > + > > Further information > > =================== > > > > No Documentation/ABI/ update for this new sysfs file? > I thought it better to put in uio documentation where it was likely to be seen. Also file doesn't exist until sub channel is created on UIO device. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
