drm MSI support

Robert Noland rnoland at 2hip.net
Sat Oct 4 16:46:14 UTC 2008

On Sat, 2008-10-04 at 11:39 -0400, Robert Noland wrote:
> I would like to get some initial feedback on this patch.  It enables MSI
> on capable cards.  (I'm using it on my i965gm)  The guys at Intel have
> done this in the Linux driver.  I have implemented it in our
> infrastructure code which means that we will enable it on any hardware
> that reports capable.  The Intel guys have explicitly blacklisted a
> couple of 945 class devices, stating that they report capable but don't
> appear to work.  While I would like to get verification that these chips
> don't work, don't be surprised if it doesn't work if you have chips 2772
> or 27a2.  I have not implemented the blacklist bits yet.
> The Linux crew has never enabled MSI on radeon hardware, though several
> devices appear to report capable.  When I inquired as to why they hadn't
> done so, they just stated that they hadn't gotten around to it.  I'm
> particularly interested to see how this works on radeons.
> In order to use this patch, you need to be running CURRENT as I had to
> make a few other changes to vgapci to get this working. You can see if
> you hardware is capable by running pciconf -lvc.  You will see something
> like this:

CURRENT needs to be at least:
r183194 | rnoland | 2008-09-19 15:11:35 -0400 (Fri, 19 Sep 2008) | 6

pci_setup_intr() will only enable MSI/MSI-X for direct children.  Add
to vga_pci.c to request on behalf of it's children.  This causes vgapci
to show
up as the interrupt owner in vmstat -i, rather than the child device.

Approved by:    jhb(mentor)


> vgapci0 at pci0:0:2:0:     class=0x030000 card=0x01f91028 chip=0x2a028086
> rev=0x0c hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Mobile 965 Express Integrated Graphics Controller'
>     class      = display
>     subclass   = VGA
>     cap 05[90] = MSI supports 1 message 
>     cap 01[d0] = powerspec 3  supports D0 D3  current D0
> When drm loads it will also report that it has enabled MSI.
> Please send me reports of what chips do/don't work.
> The patch is located at:
> http://people.freebsd.org/~rnoland/drm-msi.patch
> robert.
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