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    SubjectRe: [PATCH 0/5] Detect hwmon and i2c bus drivers interfering with ACPI Operation Region resources
    Date
    This is one of the most imortant issues with ACPI in Linux,
    and I too thank you, Thomas and Jean, for your hard work
    seeking the right solution.

    1, 2 and 3 of 5 applied to acpi-test.

    thanks,
    -Len

    On Wednesday 24 October 2007 10:31, Thomas Renninger wrote:
    > Hi,
    >
    > it seems Len's test tree and Linus tree diverged a bit, at least with
    > this patch set things do not apply cleanly.
    >
    > Therefore I post these for discussion whether and in which kernel tree
    > they should end up before doing work for nothing.
    > If they are still a candidate for 2.6.24 (rather unintrusive), pls tell
    > me whether and when I should base them against Len's test/release branch
    > or whatever other tree.
    > If not, it would be great if they can be included into the -mm tree and
    > I can rebase them against this one.
    >
    > Be aware that there is a small change in ACPICA (first patch, that's
    > also the reason why this one would not compile on its own).
    >
    > Many thanks for detailed review, testing and a lot implementation help
    > go to Jean Delvare, without his help I would not be able to post
    > anything right now.
    >
    > Thanks for any help/advise,
    >
    > Thomas
    >
    > --------------
    > Short general description:
    >
    > In ACPI, AML can define accesses to IO ports and System Memory by
    > Operation Regions. Those are not registered as done by PNPACPI using
    > resource templates (and _CRS/_SRS methods).
    > The IO ports and System Memory regions may get accessed by arbitrary AML
    > code. When native drivers are accessing the same resources bad things
    > can happen (e.g. a critical shutdown temperature of 3000 C every 2
    > months or so).
    > It is not really possible to register the operation regions via
    > request_resource, as they often overlap with pnp or other resources
    > (e.g. statically setup IO resources below 0x100).
    > This approach stores all Operation Region declarations (IO and System
    > Memory only) at ACPI table parse time. It offers a similar functionality
    > like request_region and let drivers which are known to possibly use the
    > same IO ports and Memory which are also often used by ACPI (hwmon and
    > i2c) check for ACPI interference.
    >
    > A boot parameter acpi_enforce_resources=strict/lax/no is provided, which
    > is default set to lax:
    > - strict: let conflicting drivers fail to load with an error message
    > - lax: let conflicting driver work normal with a warning message
    > - no: no functional change at all
    > Depending on the feedback and the kind of interferences we see, this
    > should be set to strict at later time.
    >
    > Goal of this patch set is:
    > - Identify ACPI interferences in bug reports (very hard to reproduce
    > and to identify)
    > - Find BIOSes for that an ACPI driver should exist for specific HW
    > instead of a native one.
    > - stability in general
    >
    >
    > -
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    -
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