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Re: [Q] PCI Express and ide (native) leads to irq storm? [message #8326 is a reply to message #8322]

Wed, 15 November 2006 18:49

Jeff Garzik
Messages: 9
Registered: February 2006

Junior Member

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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[Message index]

		[Q] ide cdrom in native mode leads to irq storm? By: vaverin on Tue, 24 October 2006 07:37
		Re: [Q] ide cdrom in native mode leads to irq storm? By: vaverin on Tue, 24 October 2006 07:53
		Re: [Q] ide cdrom in native mode leads to irq storm? By: vaverin on Fri, 27 October 2006 13:17
		Re: [Q] ide cdrom in native mode leads to irq storm? By: Alan Cox on Fri, 27 October 2006 14:19
		[Q] PCI Express and ide (native) leads to irq storm? By: vaverin on Tue, 14 November 2006 09:08
		Re: [Q] PCI Express and ide (native) leads to irq storm? By: Tejun Heo on Wed, 15 November 2006 10:46
		Re: [Q] PCI Express and ide (native) leads to irq storm? By: Jeff Garzik on Wed, 15 November 2006 18:49
		Re: [Q] PCI Express and ide (native) leads to irq storm? By: vaverin on Thu, 16 November 2006 08:45
		Re: [Q] workaround for ide (native) leads to irq storm? By: vaverin on Fri, 17 November 2006 12:54

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