Re: [Q] PCI Express and ide (native) leads to irq storm?

Tejun Heo wrote:

In short, some piix controllers including ICH7, when put into enhanced mode (PCI native mode), uses BMDMA Interrupt bit as interrupt pending/clear bit for *all* commands. ie. Reading STATUS does NOT clear

Yep.  I thought I had mentioned this, ages ago.

Fortunately, libata is immune to the problem because it does ap->ops->irq_clear(ap) in ata_host_intr() regardless of command type in flight. So, not loading IDE piix and using libata to drive all piix ports solves the problem.

Yep, that's intentional :)

	Jeff



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• References:
  • [Q] ide cdrom in native mode leads to irq storm?
    • From: Vasily Averin <[email protected]>
  • Re: [Q] ide cdrom in native mode leads to irq storm?
    • From: Vasily Averin <[email protected]>
  • Re: [Q] ide cdrom in native mode leads to irq storm?
    • From: Vasily Averin <[email protected]>
  • Re: [Q] ide cdrom in native mode leads to irq storm?
    • From: Alan Cox <[email protected]>
  • [Q] PCI Express and ide (native) leads to irq storm?
    • From: Vasily Averin <[email protected]>
  • Re: [Q] PCI Express and ide (native) leads to irq storm?
    • From: Tejun Heo <[email protected]>

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