linux-kernel - Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

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Date:	Fri, 25 May 2007 08:42:39 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Greg KH <gregkh@...e.de>, Jay Cliburn <jacliburn@...lsouth.net>,
	Grzegorz Krzystek <ninex@...eX.eu.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, ninex@...pl,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	Michael Ellerman <michael@...erman.id.au>,
	David Miller <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

 >  > - In spec hardware does not require MSI to generate interrupts
 >  >   Which leaves enabling MSI optional.
 > 
 > Actually at least the Qlogic/Pathscale PCI Express ipath adapters
 > cannot generate INTx interrupts -- they definitely do require MSI to
 > operate.

Oh yeah... when I first found out about this, I rechecked the PCI
Express spec and found that in fact legacy INTx interrupts are
optional.  So the ipath adapters that require MSI do conform to the
spec.

 - R.
-
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