From: Chris Metcalf <cmetcalf@tilera.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: <linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] drivers/char/hvc_console.c: reduce max idle timeout
Date: Wed, 27 Oct 2010 15:46:27 -0400 [thread overview]
Message-ID: <4CC88193.8020607@tilera.com> (raw)
In-Reply-To: <20101027202101.226085c1@lxorguk.ukuu.org.uk>
On 10/27/2010 3:21 PM, Alan Cox wrote:
> On Wed, 27 Oct 2010 12:54:27 -0400 Chris Metcalf <cmetcalf@tilera.com> wrote:
>> The tile architecture uses this framework for our serial console,
> That may be a mistake unless your console is genuinely only capable of
> polled input.
The console is in fact interrupt-driven within the hypervisor, and data is
buffered there. However, the current hypervisor console API is only
"write" and "read". We have a bugzilla to add console interrupts to the
hypervisor API and use them from Linux, but we haven't done it yet.
--
Chris Metcalf, Tilera Corp.
http://www.tilera.com
WARNING: multiple messages have this Message-ID (diff)
From: Chris Metcalf <cmetcalf@tilera.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drivers/char/hvc_console.c: reduce max idle timeout
Date: Wed, 27 Oct 2010 15:46:27 -0400 [thread overview]
Message-ID: <4CC88193.8020607@tilera.com> (raw)
In-Reply-To: <20101027202101.226085c1@lxorguk.ukuu.org.uk>
On 10/27/2010 3:21 PM, Alan Cox wrote:
> On Wed, 27 Oct 2010 12:54:27 -0400 Chris Metcalf <cmetcalf@tilera.com> wrote:
>> The tile architecture uses this framework for our serial console,
> That may be a mistake unless your console is genuinely only capable of
> polled input.
The console is in fact interrupt-driven within the hypervisor, and data is
buffered there. However, the current hypervisor console API is only
"write" and "read". We have a bugzilla to add console interrupts to the
hypervisor API and use them from Linux, but we haven't done it yet.
--
Chris Metcalf, Tilera Corp.
http://www.tilera.com
next prev parent reply other threads:[~2010-10-27 19:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 16:54 [PATCH] drivers/char/hvc_console.c: reduce max idle timeout Chris Metcalf
2010-10-27 19:21 ` Alan Cox
2010-10-27 19:21 ` Alan Cox
2010-10-27 19:46 ` Chris Metcalf [this message]
2010-10-27 19:46 ` Chris Metcalf
2010-11-02 0:35 ` Michael Ellerman
2010-11-02 0:35 ` Michael Ellerman
2010-11-02 2:21 ` Chris Metcalf
2010-11-02 2:21 ` Chris Metcalf
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