Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. | KernelTrap

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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From: Christer Weinigel <christer@...>

To: Rene Herman <rene.herman@...>

Cc: Ingo Molnar <mingo@...>, Alan Cox <alan@...>, David P. Reed <dpreed@...>, H. Peter Anvin <hpa@...>, Rene Herman <rene.herman@...>, Paul Rolland <rol@...>, Pavel Machek <pavel@...>, Thomas Gleixner <tglx@...>, <linux-kernel@...>, Ingo Molnar <mingo@...>, <rol@...>

Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

Date: Tuesday, January 1, 2008 - 4:55 pm

On Tue, 01 Jan 2008 20:59:20 +0100
Rene Herman <rene.herman@keyaccess.nl> wrote:

quoted text> On 01-01-08 20:35, Christer Weinigel wrote:
> 
> > On old hardware (or anything with an ISA bus which I'd guess
> > includes the Geode SCx200 SoC which is basically a MediaGX
> > processor, a southbridge and an ISA bus with a Super I/O chip on
> > it) an out to 80h will use exactly one ISA cycle.
> 
> Not to disagree with the point but more like 8 (1 us at 8 MHz). It's
> the timeout property.

Ah, sorry, you're right of course.

quoted text> > I'm not sure what Alan meant with his comments about locking, but if
> > changing outb_p to use an udelay means that we have to add locking,
> > that is also going to affect the code size and speed.
> 
> Explained here:
> 
> http://lkml.org/lkml/2007/12/30/136
> 
> However, that's not an argument. Missing locking is a bug, and
> current outb I/O delay use hiding it doesn't change that.

Thanks, I had missed that one.

Regarding Alan's comment:

quoted text>For that matter does anyone actually have video cards old enough for us
>to care actually still in use with Linux today ? 

I'm afraid that some PC104 systems may still use ancient video cards.

  /Christer
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Messages in current thread:

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., David P. Reed, (Tue Jan 1, 11:59 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Pavel Machek, (Tue Jan 1, 1:31 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., David P. Reed, (Tue Jan 1, 1:33 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 12:15 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:15 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 5:35 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:44 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Maciej W. Rozycki, (Wed Jan 9, 1:27 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Wed Jan 9, 2:18 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 6:35 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 6:39 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 7:11 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 8:55 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 10:27 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 9:00 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 8:25 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., David P. Reed, (Tue Jan 1, 1:32 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 1:38 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 12:43 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 1:32 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 2:45 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 5:07 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Wed Jan 2, 6:04 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Wed Jan 2, 9:47 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Wed Jan 2, 11:35 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Wed Jan 2, 11:50 am)

Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port..., David P. Reed, (Wed Jan 2, 9:11 am)

Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port..., Ingo Molnar, (Wed Jan 2, 9:21 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 4:14 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 5:13 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 1:32 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 2:46 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 3:35 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:21 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Wed Jan 2, 6:00 am)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 7:05 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 7:12 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 8:23 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Ingo Molnar, (Tue Jan 1, 5:01 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 5:42 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:50 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 5:42 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Alan Cox, (Tue Jan 1, 5:26 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Rene Herman, (Tue Jan 1, 3:59 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., Christer Weinigel, (Tue Jan 1, 4:55 pm)

Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay ove..., H. Peter Anvin, (Tue Jan 1, 5:24 pm)

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