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

From: Cam Macdonell
Subject: [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver
Date: Thu, 25 Mar 2010 10:24:20 -0600

On Thu, Mar 25, 2010 at 3:46 AM, Avi Kivity <address@hidden> 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?


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

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