PCI BAR mmap

[John Baldwin]

On Tuesday, July 31, 2012 12:14:41 pm Adrian Chadd wrote:
> On 31 July 2012 08:22, Venkat Duvvuru <venkatduvvuru.ml at gmail.com> wrote:
> > Hi John,
> > Thanks for your response.
> > Is there an alternative to mmap the PCI BARs, I mean without implementing
> > an mmap method in the driver, something like a pci subsystem mmap in 
Linux.
> > Linux allows to mmap PCI BARs without any change in the device driver.
> 
> I guess someone could implement a sysctl API to access PCI BAR
> registers, rather than mapping /dev/pci or however pciconf -r works.
> 
> That way you'd implement it once and all devices would have their BAR
> registers show up in a userland-friendly way.

Eh, no sysctl.  /dev/pci uses ioctls.  However, having a generic way to mmap 
BARs may be useful.

-- 
John Baldwin