From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>,
Michael <michaelzwrk@gmail.com>,
linuxppc-embedded@ozlabs.org, linux-ide@vger.kernel.org
Subject: Re: IDE driver in polling mode
Date: Tue, 10 Apr 2007 12:18:15 -0400 [thread overview]
Message-ID: <461BB8C7.9050900@garzik.org> (raw)
In-Reply-To: <20070410171125.3aeed29d@the-village.bc.nu>
Alan Cox wrote:
>> Ah, no interrupts at all...
>> The old IDE core in drivers/ide/ certainly doesn't support polling mode
>> and IRQ-less devices. AFAICS, libata also doesn't support the latter...
>
> libata has much of the framework to do this as it originally did all of
> its PIO work much this way. That is probably the most productive place to
> start hacking.
Yep.
The only real restriction in libata is in ata_device_add(), which
unconditionally registers an irq handler. Make a few changes there, add
a few flags, and the existing polling code will kick in.
Once we have higher priority stuff sorted, I would like to look into
things like activating the polling code when it becomes obvious that the
system is not delivering interrupts.
Jeff
WARNING: multiple messages have this Message-ID (diff)
From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-ide@vger.kernel.org, linuxppc-embedded@ozlabs.org
Subject: Re: IDE driver in polling mode
Date: Tue, 10 Apr 2007 12:18:15 -0400 [thread overview]
Message-ID: <461BB8C7.9050900@garzik.org> (raw)
In-Reply-To: <20070410171125.3aeed29d@the-village.bc.nu>
Alan Cox wrote:
>> Ah, no interrupts at all...
>> The old IDE core in drivers/ide/ certainly doesn't support polling mode
>> and IRQ-less devices. AFAICS, libata also doesn't support the latter...
>
> libata has much of the framework to do this as it originally did all of
> its PIO work much this way. That is probably the most productive place to
> start hacking.
Yep.
The only real restriction in libata is in ata_device_add(), which
unconditionally registers an irq handler. Make a few changes there, add
a few flags, and the existing polling code will kick in.
Once we have higher priority stuff sorted, I would like to look into
things like activating the polling code when it becomes obvious that the
system is not delivering interrupts.
Jeff
next prev parent reply other threads:[~2007-04-10 16:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-10 13:35 IDE driver in polling mode Michael
2007-04-10 14:19 ` Sergei Shtylyov
2007-04-10 14:19 ` Sergei Shtylyov
2007-04-10 14:44 ` Mark Lord
2007-04-10 15:31 ` Michael
2007-04-10 16:11 ` Alan Cox
2007-04-10 16:18 ` Jeff Garzik [this message]
2007-04-10 16:18 ` Jeff Garzik
2007-04-10 16:29 ` Alan Cox
2007-04-11 8:39 ` Michael
2007-04-11 8:39 ` Michael
2007-04-11 8:47 ` Alan Cox
2007-04-11 15:10 ` Michael
2007-04-11 15:10 ` Michael
2007-04-11 15:23 ` Alan Cox
2007-04-11 15:23 ` Alan Cox
2007-04-12 13:39 ` Mark Lord
2007-04-12 13:39 ` Mark Lord
2007-04-12 13:40 ` Mark Lord
2007-04-12 13:40 ` Mark Lord
2007-04-12 13:43 ` Mark Lord
2007-04-12 13:43 ` Mark Lord
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