From: Chris Wedgwood <cw@f00f.org>
To: Andrew McNamara <andrewm@connect.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: how to tell Linux *not* to share IRQs ?
Date: Thu, 26 Jul 2001 19:39:34 +1200 [thread overview]
Message-ID: <20010726193934.A29055@weta.f00f.org> (raw)
In-Reply-To: <20010726070621.D69A1BE91@wawura.off.connect.com.au>
In-Reply-To: <20010726070621.D69A1BE91@wawura.off.connect.com.au>
On Thu, Jul 26, 2001 at 05:06:21PM +1000, Andrew McNamara wrote:
Does this mean the ISRs for every driver sharing an interrupt have
to poll their device when an interrupt comes in (in the case of
shared PCI interrupts), or is there some additional hardware
smarts so the kernel knows which driver's ISRs need to be invoked?
Yes, drivers need to check their hardware devices and acknowledge
whether or not it's was their interrupt or not. It sounds terrible
but even with many thousands of interrupts per second the cost doesn't
seem to be that high.
--cw
next prev parent reply other threads:[~2001-07-26 7:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-25 23:23 Scott McDermott
2001-07-25 23:37 ` Alan Cox
2001-07-26 7:06 ` Andrew McNamara
2001-07-26 7:39 ` Chris Wedgwood [this message]
2001-08-07 15:09 ` Jes Sorensen
2001-08-08 0:05 ` Andrew McNamara
2001-08-08 11:14 ` Eric W. Biederman
2001-08-08 17:13 ` Mark H. Wood
2001-07-26 7:54 ` Francois Romieu
2001-08-08 19:03 Per Jessen
2001-08-08 19:19 ` Chris Meadors
2001-11-06 23:17 ` H. Peter Anvin
2001-08-09 14:27 ` Andreas Bombe
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