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. Alex
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