From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: User mode drivers: part 1, interrupt handling (patch for 2.6.11)
Date: Mon, 14 Mar 2005 13:33:31 +0000 [thread overview]
Message-ID: <1110807209.15943.115.camel@localhost.localdomain> (raw)
In-Reply-To: <16948.54411.754999.668332@wombat.chubb.wattle.id.au>
On Llu, 2005-03-14 at 00:02, Peter Chubb wrote:
> I can see there'd be problems if the code allowed shared interrupts,
> but it doesn't.
If you don't allow shared IRQ's its useless, if you do allow shared
IRQ's it deadlocks. Take your pick 8)
As to your comment about needing to do a few more I/O operations I
agree. However if your need is for speed then you might want to just
write a small IRQ helper module for the kernel or extend the syntax I
proposed a little (its conveniently trivial to generate native code from
this).
There isn't much you can do about the status read without MWI on most
chip designs (some get it right by posting status to system memory but
not many)
Alan
next prev parent reply other threads:[~2005-03-14 13:35 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-11 3:36 Peter Chubb
2005-03-11 10:29 ` Pavel Machek
2005-03-12 16:27 ` Jon Smirl
2005-03-12 18:55 ` Jon Smirl
2005-03-14 0:39 ` Peter Chubb
2005-03-14 1:24 ` Jon Smirl
2005-03-11 13:50 ` Michael Raymond
2005-03-11 17:25 ` Greg KH
2005-03-11 17:31 ` Michael Raymond
2005-03-11 19:14 ` Alan Cox
2005-03-13 2:03 ` Jon Smirl
2005-03-15 4:32 ` Lee Revell
2005-03-15 13:28 ` Alan Cox
2005-03-14 0:02 ` Peter Chubb
2005-03-14 13:33 ` Alan Cox [this message]
2005-03-15 3:15 ` Jon Smirl
2005-03-12 15:55 ` Jon Smirl
2005-03-12 17:11 ` Zwane Mwaikambo
2005-03-14 1:55 ` Jon Smirl
2005-03-14 3:04 ` Peter Chubb
2005-03-14 0:36 ` Peter Chubb
[not found] ` <9e47339105031317193c28cbcf@mail.gmail.com>
2005-03-14 1:42 ` Peter Chubb
2005-03-14 1:52 ` Jon Smirl
2005-03-14 3:06 ` Peter Chubb
2005-03-15 3:19 ` Jon Smirl
2005-03-15 3:47 ` Peter Chubb
2005-03-15 3:50 ` Jon Smirl
2005-03-15 4:11 ` Peter Chubb
2005-03-15 19:20 Stephen Warren
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