Messages in this thread | | | Date | Wed, 23 Feb 2005 15:46:25 -0500 (EST) | From | linux-os <> | Subject | Re: Help enabling PCI interrupts on Dell/SMP and Sun/SMP systems. |
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On Wed, 23 Feb 2005, Alan Kilian wrote:
call pci_enable_device(dev) ... before you use the IRQ in dev->irq.
The reported IRQ is bogus until you make that call. It's a reported BUG, probably won't ever get fixed because it's considered a feature.
Also, make sure that your .config for the Dell looks something like:
CONFIG_X86_IO_APIC=y CONFIG_X86_LOCAL_APIC=y CONFIG_PCI=y # CONFIG_PCI_GOBIOS is not set # CONFIG_PCI_GODIRECT is not set CONFIG_PCI_GOANY=y CONFIG_PCI_BIOS=y CONFIG_PCI_DIRECT=y
> > > Folks, > > This group was instrumental in helping me get my first-ever > linux/PCI-bus device driver working last year, and I'm back for > some more help if you are willing. > > I have a PCI card that generates an interrupt when it completes > a DMA transfer to the PCs RAM. > > This works just fine on a Dell 4400 running 2.6.10-1.766_FC3 > > When I try to run the driver on a Dell 2300 FC2/2.6.5-1.358smp > or a Sun W2100Z running FC2/2.6.10-1.14_FC2smp I can see the > DMA-done bit set in the device, but my interrupt service routine > never gets called. > > On the Sun, I booted with "noapic" option, and it booted OK, > but then when my device generated an interrupt, there was a > kernel message about Disabling IRQ #5 and the system was hung > solidly. > > I think this has something to do with the different interrupt > hardware on the more advanced servers compared to my desktop > Dell 4400, and I somehow need to "enable" the IOAPIC system > so that my interrupt gets through to my service routine, but I > don't know how. > > I tried grepping through the kernel/drivers source, and I didn't > find anything that jumped out at me. > > The Rubini drivers book didn't help in this area either, > although it's a wonderful book in other areas. > > I can post source somewhere if it will help. > > I can also post the essential bits from /var/log/messages about > all the incredibly complicated IOAPIC configuration stuff. > > Thank you for your past help, and thank you in advance for any > tips you can provide. > > -Alan > > -- > - Alan Kilian <kilian(at)bobodyne.com> >
Cheers, Dick Johnson Penguin : Linux version 2.6.10 on an i686 machine (5537.79 BogoMips). Notice : All mail here is now cached for review by Dictator Bush. 98.36% of all statistics are fiction. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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