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

On 16-12-07 22:42, H. Peter Anvin wrote:

It probably comes down to which version is bigger (you probably also want to try uninlining.)

slow_down_io() sort of needs to stay inline due to the REALLY_SLOW_IO thing. That stuff could use a cleanup, but that would be a diferent patch.

Thanks for the heads up (also saw the SMBIOS update to this) but those don't seem to be a problem in fact. David Reed has been running with the simple udelay(2) version of this and reported no more hangs. He moreover reported no trouble after booting with "acpi=off" meaning that things seem to be fine pre-acpi which the boot code (and this io_delay_init) is. So I believe we get to ignore those.

Okay, so there is something inside ACPI which tickles this. Which brings further credibility that it's activating a debugging hack, probably inside the SuperIO/system controller chip.

It would be interesting to know exactly which part of ACPI triggers this. I bet it is a reference to system controller namespace.

Do you expect a BIOS update to be able to fix it? If so, I guess any DMI hack should take BIOS version into account.

Rene.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: "H. Peter Anvin" <[email protected]>

• References:
  • [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "David P. Reed" <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Pavel Machek <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Alan Cox <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Paul Rolland <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: "H. Peter Anvin" <[email protected]>

• Prev by Date: div64: Rework 64-bit type safety checks in do_div().
• Next by Date: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
• Previous by thread: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
• Next by thread: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]