On 2014/7/3 11:20, Ilia Mirkin wrote: > Hello, > > A user (cc'd) reported that nouveau's enabling of MSI causes the card > to not work on his setup [1]. I think the situation is that MSI is > just not supported by the underlying motherboard, even though the > card, and probably bridge, support it just fine. It's a very old > board. The nouveau code does: What is the kernel version running in your board ? > > pmc->use_msi = pci_enable_msi(device->pdev) == 0; Driver call pci_enable_msi() and always return 0 ? > > Does it need to do more checking than that before trying to enable MSI > on the device? Could it be that the linux pci subsystem is missing on > inheriting MSI capabilities somewhere? pci_enable_msi() will checking your device whether it supports MSI. Can you provide the detailed lspci information ? eg. lspci -vvvxxx ? > > -ilia > > [1] > > 00:00.0 Host bridge [0600]: Intel Corporation 430FX - 82437FX TSC > [Triton I] [8086:122d] (rev 01) > Flags: bus master, medium devsel, latency 64 > > 00:0e.0 PCI bridge [0604]: PLX Technology, Inc. PEX8112 x1 Lane PCI > Express-to-PCI Bridge [10b5:8112] (rev aa) (prog-if 00 [Normal > decode]) > Flags: bus master, 66MHz, medium devsel, latency 66 > Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 > I/O behind bridge: 0000f000-0000ffff > Memory behind bridge: f5e00000-fbffffff > Prefetchable memory behind bridge: d5d00000-f5dfffff > Capabilities: [40] Power Management version 2 > Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+ > Capabilities: [60] Express PCI/PCI-X to PCI-Express Bridge, MSI 00 > > 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G96 > [GeForce 9400 GT] [10de:0641] (rev a1) (prog-if 00 [VGA controller]) > Subsystem: Jaton Corp Device [1b13:0641] > Flags: bus master, fast devsel, latency 0, IRQ 11 > Memory at fb000000 (32-bit, non-prefetchable) [size=16M] > Memory at e0000000 (64-bit, prefetchable) [size=256M] > Memory at f8000000 (64-bit, non-prefetchable) [size=32M] > I/O ports at fc80 [size=128] > [virtual] Expansion ROM at d5d00000 [disabled] [size=512K] > Capabilities: [60] Power Management version 3 > Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ > Capabilities: [78] Express Endpoint, MSI 00 > Capabilities: [b4] Vendor Specific Information: Len=14 <?> > Kernel driver in use: nouveau > -- > 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 > > -- Thanks! Yijing -- 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
