Messages in this thread | | | Date | Wed, 5 Feb 2003 18:58:25 +0100 | From | Stephan von Krawczynski <> | Subject | Re: 2.4.21-pre4: PDC ide driver problems with shared interrupts |
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On 05 Feb 2003 18:44:51 +0100 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> On Wed, 2003-02-05 at 18:38, Stephan von Krawczynski wrote: > > On 05 Feb 2003 18:34:55 +0100 > > Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: > > > > > On Wed, 2003-02-05 at 18:19, Ross Biro wrote: > > > > Benjamin Herrenschmidt wrote: > > > > > > > > >While I agree with you here, I don't think it's what's happening. > > > > > /* clear INTR & ERROR flags */ > > > > > hwif->OUTB(dma_stat|6, hwif->dma_status); > > > > > > > > > > > > > > > > > > > You have way to much faith in the hardware. Promise is especially > > > > known for not keeping to the spec. I wouldn't trust the interrupt bit > > > > to be valid unless a dma is actually active, i.e. that > > > > > > > > hwif->OUTB(hwif->INB(dma_base)|1, dma_base); > > > > > > > > has actually been written. > > > > > > > > I've actually had a manufacturer tell me that they don't worry about > > > > the spec, just making things work with Windows. > > > > > > Ok, so that gives us 2 possibilities. The above problem, which would be > > > fixed by locking all around ide_dma_read/write (or rather in the > > > _caller_, seems better so we don't have to drop the lock for ATAPI). > > > > > > And a possible wraparound of waiting_for_dma if 255 IRQs come in from > > > whatever device we share the IRQ line with. > > > > > > I beleive both need fixing... > > > > > > Ben. > > > > Ok, yet another small brick in the wall: this mb has 64bit/66MHz PCI slots. > > PDC is only 32bit/33MHz PCI. So it may well be that others are in fact > > _able_ to produce a damn lot more data/interrupts than the PDC. I am pretty > > astonished by the number of interrupts created by the 3com tg3 cards > > anyways... > > Ok, then please try my "fix" to remove the increment of waiting_for_dma > and let us know if it helps.
I will try, in the meantime can any kind soul please give me a hint why I cannot see the interrupts distributed among the CPUs when enabling smp and apic on this very same box:
CPU0 CPU1 0: 71158 0 IO-APIC-edge timer 1: 941 0 IO-APIC-edge keyboard 2: 0 0 XT-PIC cascade 12: 33166 0 IO-APIC-edge PS/2 Mouse 15: 4 0 IO-APIC-edge ide1 17: 1732 0 IO-APIC-level ide2, ide3 18: 3423 0 IO-APIC-level eth0, eth1 21: 8177 0 IO-APIC-level eth2 22: 112943 0 IO-APIC-level aic7xxx 23: 16 0 IO-APIC-level aic7xxx 25: 74 0 IO-APIC-level HiSax 26: 0 0 IO-APIC-level EMU10K1 NMI: 0 0 LOC: 71085 71059 ERR: 0 MIS: 0
?? (kernel 2.4.21-pre4) -- Regards, Stephan - 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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