Hi Petr,
Thanks for the suggestion.
What you pointed out was the source of the problem. After
enabling the MSI-to-HTInterrupts(the value at offset 0xF6),
I now see interrupts and can ping in both MSI and MSI-X modes.
Ravi
-----Original Message-----
From: Petr Vandrovec [mailto:[email protected]]
Sent: Tuesday, May 16, 2006 8:01 AM
To: Andi Kleen
Cc: [email protected]; Peter. Phan; Leonid Grossman;
[email protected]
Subject: Re: MSI-X support on AMD 8132 platforms ?
Andi Kleen wrote:
> "Ravinandan Arakali" <[email protected]> writes:
>
>
>>I was wondering if anybody has got MSI-X going on AMD 8132 platforms.
>>Our network card and driver support MSI-X and the combination works
>>fine on IA64 and xeon platforms. But on the 8132, the MSI-X vectors are
>>assigned(pci_enable_msix succeeds) but no interrupts get generated.
>
>
> See erratum #78 in the AMD 8132 Specification update.
> It doesn't support the MSI capability and there are no plans to fix that.
>
> AFAIK the only way to get MSI on Opteron is on PCI Express.
I do not think that erratum #78 is related to this - it is related to tunnel
itself generating MSI - which is not needed in this case.
>>Note that with a different OS, MSI-X does work on 8132.
>
> Are you sure?
Can you provide 'lspci -vvvxxx' output from AMD8132 bridge? (esp. bytes
0xF4-0xFF from config space of 1022:7458 devices) By default dword at 0xF4
is
0xA8000008, disabling MSI/MSI-X mapping -> hypertransport interrupts.
Changing
this to 0xA8010008 should enable this translation (iff qword at 0xF8 is
0x0000FEE00000), allowing MSI to work on respective secondary/subordinate
busses. Unfortunately kernel ignores these HT capabilities...
Petr
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
