Michael Ellerman wrote: > On Sun, 2008-12-21 at 01:13 +0400, Manu Abraham wrote: >> Grant Grundler wrote: >>> On Sun, Dec 14, 2008 at 03:15:15PM +0400, Manu Abraham wrote: >>> ... >>>>> A "GSI" (Generic Sys Interrupt?) is associated with each entry in >>>>> the MSI-X table. Driver then calls request_irq() to bind an interrupt >>>>> handler to each GSI. So the driver never directly sees the "message". >>>> Oh, you mean the array of irq_handlers in the MSI-X table should >>>> correspond to a particular message ? >>> No. I mean each MSI-X entry has an address+message pair and each MSI-X entry >>> is associated with the parameters passed to each call of request_irq(). >>> Pass in unique private data to each call of request_irq() and the driver >>> can determine which message was delivered when the ISR gets called. >>> (ISR == Interrupt Service Routine, aka driver IRQ handler) >> >> Is it possible that even when the config space says that multiple messages >> are supported, you cannot enable MSI-X ? > > Yes, absolutely. Have a look at pci_msi_check_device() for starters. MSI > can be disabled globally, or per-device by a quirk, the bridges above > your device might not support MSI and the arch code may prevent > MSI/MSI-X for some reason (ie. platform doesn't support it). It seems that the bridge does support MSI. It looks like my video device is using MSI. Regards, Manu pci 0000:01:00.0: Boot video device PCI: Setting latency timer of device 0000:00:01.0 to 64 assign_interrupt_mode Found MSI capability Allocate Port Service[0000:00:01.0:pcie00] PCI: Setting latency timer of device 0000:00:1c.0 to 64 assign_interrupt_mode Found MSI capability Allocate Port Service[0000:00:1c.0:pcie00] Allocate Port Service[0000:00:1c.0:pcie02] PCI: Setting latency timer of device 0000:00:1c.1 to 64 assign_interrupt_mode Found MSI capability Allocate Port Service[0000:00:1c.1:pcie00] Allocate Port Service[0000:00:1c.1:pcie02] PCI: Setting latency timer of device 0000:00:1c.2 to 64 assign_interrupt_mode Found MSI capability Allocate Port Service[0000:00:1c.2:pcie00] Allocate Port Service[0000:00:1c.2:pcie02] PCI: Setting latency timer of device 0000:00:1c.3 to 64 assign_interrupt_mode Found MSI capability Allocate Port Service[0000:00:1c.3:pcie00] Allocate Port Service[0000:00:1c.3:pcie02] PCI: Setting latency timer of device 0000:00:1c.4 to 64 assign_interrupt_mode Found MSI capability Allocate Port Service[0000:00:1c.4:pcie00] Allocate Port Service[0000:00:1c.4:pcie02] vesafb: framebuffer at 0x91000000, mapped to 0xf8880000, using 10240k, total 14336k vesafb: mode is 1280x1024x16, linelength=2560, pages=1 04:00.0 Multimedia controller: Philips Semiconductors Device 7160 (rev 02) Subsystem: Technotrend Systemtechnik GmbH Device 3009 Flags: bus master, fast devsel, latency 0, IRQ 11 Memory at 93b00000 (64-bit, non-prefetchable) [size=1M] Capabilities: <access denied> 05:00.0 Multimedia controller: Philips Semiconductors Device 7160 (rev 01) Subsystem: Philips Semiconductors Device 0000 Flags: bus master, fast devsel, latency 0, IRQ 19 Memory at 93a00000 (64-bit, non-prefetchable) [size=1M] Capabilities: <access denied> Kernel driver in use: SAA716x Hybrid -- 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