Robert Noland wrote:
On Wed, 2009-02-25 at 12:51 -0500, John Baldwin wrote:
On Wednesday 25 February 2009 12:27:23 pm Nathan Whitehorn wrote:
John Baldwin wrote:
Author: jhb
Date: Mon Feb 2 19:54:16 2009
New Revision: 188018
URL: http://svn.freebsd.org/changeset/base/188018
Log:
- Add a new ioctl to /dev/pci to fetch details on an individual BAR of a
device. The details include the current value of the BAR (including all
the flag bits and the current base address), its length, and whether or not
it is enabled. Since this operation is not invasive, non-root users are
allowed to use it (unlike manual config register access which requires
root). The intention is that userland apps (such as Xorg) will use this
interface rather than dangerously frobbing the BARs from userland to
obtain this information.
- Add a new sub-mode to the 'list' mode of pciconf. The -b flag when used
with -l will now list all the active BARs for each device.
Do you happen to have any patches for libpciaccess to use this?
Libpciaccess (and so the latest Xorg server) hoses my PowerPC machine
when trying to list BARs, but pciconf -b works correctly. There are
probably endianness problems in the libpciaccess code, and it would be
nice to just replace that mess with this interface.
No, I don't have any patches. rnoland@ might. This interface was explicitly
designed to replace mess in libpciaccess. :)
I still need to work on getting this into libpciaccess. It's
complicated by the fact that we still need to keep the existing code in
place and only use the new ioctl where it exists...
I'll try and get a patch together soon.
I have a patch at http://people.freebsd.org/~nwhitehorn/freebsd_pci.c.patch
This is tested on PowerPC and amd64 running -CURRENT, and is in addition
to the patch currently applied by ports. It *should* gracefully use the
old pathway if the new ioctl isn't available. And now I have working X
on PPC!
-Nathan
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