Re: accessing a PCIe register from userspace through kmem or other ways ?

On Wednesday, March 30, 2016 11:20:51 AM Jim Harris wrote:
> On Wed, Mar 30, 2016 at 10:47 AM, Luigi Rizzo <rizzo_at_iet.unipi.it> wrote:
> 
> > Hi,
> > I'd like to test the rate at which I can access device registers
> > on a PCIe card, and was wondering whether I need to patch a device
> > driver, or perhaps I can use /dev/kmem once I figure out where
> > the registers are mapped ?
> >
> 
> You do not need to patch a device driver.  Have you looked at
> libpciaccess?  This should give you everything you need.

You can also look at what pciconf uses.  (It has a read_config() method
that uses an ioctl on an fd of /dev/pci).

-- 
John Baldwin