drm MSI support
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
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 = 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:
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