On Fri, Nov 6, 2009 at 6:10 AM, Alex Deucher <alexdeucher@xxxxxxxxx> wrote: > On Thu, Nov 5, 2009 at 9:06 AM, Matthew Wilcox <matthew@xxxxxx> wrote: >> On Thu, Nov 05, 2009 at 01:57:10PM +0100, Daniel Vetter wrote: >>> When starting a failsafe X session and starting glxgears (which should >>> cause plenty of interrupts to be generated), /proc/interrupts shows >>> absolutely no MSI interrupts arriving. There are no other devices in this >>> box using MSI interrupts. >>> >>> I've also tried with the lastest -linus git tree merged in, with the same >>> effects. >>> >>> Booting with "pci=nomsi" works around the issue. I dunno whether this is a >>> pci or radeon issue therefore I'm posting to both lists. lspci -v (as >>> root) is attached below. >> >> That sucks, and we need to fix it. >> >> It's almost certainly a chipset issue, so my suspicion falls primarily >> on this device: >> 04:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8151 AGP Bridge (rev 14) (prog-if 00 [Normal decode]) >> >> We have a number of quirks to handle MSIs (both disabling their use, and >> programming the feature in bridges that the BIOS forgot to set up) on >> HyperTransport machines already; could you send both lspci -t and >> lspci -vvvnn (as root) to the linux-pci list? > > > While working on irq support for newer radeons I've noticed a similar > issue on an rs780 board, but only with the integrated graphics chip > (1002:9610). MSIs work fine on the PCIE slots and other integrated > peripherals. When I enable MSIs on the integrated graphics chip, I > get no MSI interrupts arriving for that device. Other MSI enabled > devices work fine. I haven't had a chance to test any other rs780 > systems with integrated graphics yet. > Actually I suspect this is different, I'm guessing the PCIE<->AGP bridge on the radeon card is screwing up the MSI, I suspect we shouldn't enable MSI on AGP cards ever. Dave. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
