[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Mar 25, 2010 at 10:24:20AM -0600, Cam Macdonell wrote:
> On Thu, Mar 25, 2010 at 3:46 AM, Avi Kivity <avi@redhat.com> wrote:
> > On 03/25/2010 08:09 AM, Cam Macdonell wrote:
> >>
> >> This patch adds a driver for my shared memory PCI device using the uio_pci
> >> interface.  The driver has three memory regions.  The first memory region
> >> is for
> >> device registers for sending interrupts. The second BAR is for receiving
> >> MSI-X
> >> interrupts and the third memory region maps the shared memory.  The device
> >> only
> >> exports the first and third memory regions to userspace.
> >>
> >> This driver supports MSI-X and regular pin interrupts.  Currently, the
> >> number of
> >> MSI vectors is set to 4 which could be increased, but the driver will work
> >> with
> >> fewer vectors.  If MSI is not available, then regular interrupts will be
> >> used.
> >>
> >
> > There is now a generic PCI 2.3 driver that can handle all PCI devices.  It
> > doesn't support MSI, but if we add MSI support then it can be used without
> > the need for a specialized driver.
> 
> Agreed, I'd be happy to use the generic driver if MSI is there.  What
> would MSI support for UIO look like?  An array of "struct uio_irq" for
> the different vectors?
> 
> Cam

My idea was to supply a way to bind eventfd to a vector.

> >
> > --
> > error compiling committee.c: too many arguments to function
> >
> >