linux-toradex.git/drivers/acpi/osl.c, branch v3.4.45

efi: Make 'efi_enabled' a function to query EFI facilities

2013-02-14T18:48:53+00:00

commit 83e68189745ad931c2afd45d8ee3303929233e7f upstream.

Originally 'efi_enabled' indicated whether a kernel was booted from
EFI firmware. Over time its semantics have changed, and it now
indicates whether or not we are booted on an EFI machine with
bit-native firmware, e.g. 64-bit kernel with 64-bit firmware.

The immediate motivation for this patch is the bug report at,

    https://bugs.launchpad.net/ubuntu-cdimage/+bug/1040557

which details how running a platform driver on an EFI machine that is
designed to run under BIOS can cause the machine to become
bricked. Also, the following report,

    https://bugzilla.kernel.org/show_bug.cgi?id=47121

details how running said driver can also cause Machine Check
Exceptions. Drivers need a new means of detecting whether they're
running on an EFI machine, as sadly the expression,

    if (!efi_enabled)

hasn't been a sufficient condition for quite some time.

Users actually want to query 'efi_enabled' for different reasons -
what they really want access to is the list of available EFI
facilities.

For instance, the x86 reboot code needs to know whether it can invoke
the ResetSystem() function provided by the EFI runtime services, while
the ACPI OSL code wants to know whether the EFI config tables were
mapped successfully. There are also checks in some of the platform
driver code to simply see if they're running on an EFI machine (which
would make it a bad idea to do BIOS-y things).

This patch is a prereq for the samsung-laptop fix patch.

Signed-off-by: Matt Fleming 
Cc: David Airlie 
Cc: Corentin Chary 
Cc: Matthew Garrett 
Cc: Dave Jiang 
Cc: Olof Johansson 
Cc: Peter Jones 
Cc: Colin Ian King 
Cc: Steve Langasek 
Cc: Tony Luck 
Cc: Konrad Rzeszutek Wilk 
Cc: Rafael J. Wysocki 
Signed-off-by: H. Peter Anvin 
Signed-off-by: Greg Kroah-Hartman

Revert "ACPI: Make ACPI interrupt threaded"

2012-04-18T17:16:27+00:00

This reverts commit 6fe0d0628245fdcd6fad8b837c81e8f7ebc3364d.

Paul bisected this regression.

The conversion was done blindly and is wrong, as it does not provide a
primary handler to disable the level type irq on the device level.
Neither does it set the IRQF_ONESHOT flag which handles that at the irq
line level.  This can't be done as the interrupt might be shared, though
we might extend the core to force it.

So an interrupt on this line will wake up the thread, but immediately
unmask the irq after that.  Due to the interrupt being level type the
hardware interrupt is raised over and over and prevents the irq thread
from handling it.  Fail.

request_irq() unfortunately does not refuse such a request and the patch
was obviously never tested with real interrupts.

Bisected-by: Paul Bolle 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Linus Torvalds

Merge branch 'tboot' into release

2012-03-30T20:38:59+00:00

Conflicts:
	drivers/acpi/acpica/hwsleep.c

Text conflict between:

2feec47d4c5f80b05f1650f5a24865718978eea4
(ACPICA: ACPI 5: Support for new FADT SleepStatus, SleepControl registers)

which removed #include "actables.h"

and

09f98a825a821f7a3f1b162f9ed023f37213a63b
(x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.)

which removed #include 

The resolution is to remove them both.

Signed-off-by: Len Brown

Merge branches 'acpica', 'bgrt', 'bz-11533', 'cpuidle', 'ec', 'hotplug', 'misc', 'red-hat-bz-727865', 'thermal', 'throttling', 'turbostat' and 'video' into release

2012-03-30T20:10:37+00:00

Signed-off-by: Len Brown

ACPI: consistently use should_use_kmap()

2012-03-30T07:51:57+00:00

... so that acpi_unmap()'s behavior gets in sync with acpi_map()'s.

Signed-off-by: Jan Beulich 
Signed-off-by: Len Brown

ACPI: Make ACPI interrupt threaded

2012-03-30T05:41:45+00:00

Some ACPI interrupt actions may need to wait, and it's easiest to
have a thread context for this. So turn the ACPI interrupt
into a threaded interrupt.

Signed-off-by: Andi Kleen 
Signed-off-by: Len Brown

ACPICA: Add acpi_os_physical_table_override interface

2012-03-22T05:44:59+00:00

This interface allows the host to override a table via a
physical address, instead of the logical address required by
acpi_os_table_override. This simplifies the host implementation.
Initial implementation by Thomas Renninger. ACPICA implementation
creates a single function for table overrides that attempts both
a logical and a physical override.

Signed-off-by: Bob Moore 
Signed-off-by: Thomas Renninger 
Signed-off-by: Lin Ming 
Signed-off-by: Len Brown

ACPICA: Expand OSL memory read/write interfaces to 64 bits

2012-03-22T05:44:54+00:00

This change expands acpi_os_read_memory and acpi_os_write_memory to a
full 64 bits. This allows 64 bit transfers via the acpi_read and
acpi_write interfaces. Note: The internal acpi_hw_read and acpi_hw_write
interfaces remain at 32 bits, because 64 bits is not needed to
access the standard ACPI registers.

Signed-off-by: Bob Moore 
Signed-off-by: Lin Ming 
Signed-off-by: Len Brown

Merge branch 'stable/for-x86-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into tboot

2012-03-22T05:31:09+00:00

x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.

2012-03-13T18:06:33+00:00

The ACPI suspend path makes a call to tboot_sleep right before
it writes the PM1A, PM1B values. We replace the direct call to
tboot via an registration callback similar to __acpi_register_gsi.

CC: Len Brown 
Acked-by: Joseph Cihula 
Acked-by: Rafael J. Wysocki 
[v1: Added __attribute__ ((unused))]
[v2: Introduced a wrapper instead of changing tboot_sleep return values]
[v3: Added return value AE_CTRL_SKIP for acpi_os_sleep_prepare]
Signed-off-by: Tang Liang 
[v1: Fix compile issues on IA64 and PPC64]
[v2: Fix where __acpi_os_prepare_sleep==NULL and did not go in sleep properly]
Signed-off-by: Konrad Rzeszutek Wilk