linux-stable.git/arch/x86/kernel/setup.c, branch v3.8

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

2013-01-30T19:51:59+00:00

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.

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 
Cc: 
Signed-off-by: Matt Fleming 
Signed-off-by: H. Peter Anvin

x86/Sandy Bridge: Sandy Bridge workaround depends on CONFIG_PCI

2013-01-14T04:58:57+00:00

early_pci_allowed() and read_pci_config_16() are only available if
CONFIG_PCI is defined.

Signed-off-by: H. Peter Anvin 
Cc: Jesse Barnes

x86/Sandy Bridge: mark arrays in init functions as initconst

2013-01-14T04:36:39+00:00

Mark static arrays as __initconst so they get removed when the init
sections are flushed.

Reported-by: Mathias Krause 
Link: http://lkml.kernel.org/r/75F4BEE6-CB0E-4426-B40B-697451677738@googlemail.com
Signed-off-by: H. Peter Anvin

x86/Sandy Bridge: reserve pages when integrated graphics is present

2013-01-11T22:26:38+00:00

SNB graphics devices have a bug that prevent them from accessing certain
memory ranges, namely anything below 1M and in the pages listed in the
table.  So reserve those at boot if set detect a SNB gfx device on the
CPU to avoid GPU hangs.

Stephane Marchesin had a similar patch to the page allocator awhile
back, but rather than reserving pages up front, it leaked them at
allocation time.

[ hpa: made a number of stylistic changes, marked arrays as static
  const, and made less verbose; use "memblock=debug" for full
  verbosity. ]

Signed-off-by: Jesse Barnes 
Signed-off-by: H. Peter Anvin

Merge branch 'x86-acpi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-12-14T18:03:23+00:00

Pull x86 ACPI update from Peter Anvin:
 "This is a patchset which didn't make the last merge window.  It adds a
  debugging capability to feed ACPI tables via the initramfs.

  On a grander scope, it formalizes using the initramfs protocol for
  feeding arbitrary blobs which need to be accessed early to the kernel:
  they are fed first in the initramfs blob (lots of bootloaders can
  concatenate this at boot time, others can use a single file) in an
  uncompressed cpio archive using filenames starting with "kernel/".

  The ACPI maintainers requested that this patchset be fed via the x86
  tree rather than the ACPI tree as the footprint in the general x86
  code is much bigger than in the ACPI code proper."

* 'x86-acpi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  X86 ACPI: Use #ifdef not #if for CONFIG_X86 check
  ACPI: Fix build when disabled
  ACPI: Document ACPI table overriding via initrd
  ACPI: Create acpi_table_taint() function to avoid code duplication
  ACPI: Implement physical address table override
  ACPI: Store valid ACPI tables passed via early initrd in reserved memblock areas
  x86, acpi: Introduce x86 arch specific arch_reserve_mem_area() for e820 handling
  lib: Add early cpio decoder

x86: Use PCI setup data

2012-12-05T21:38:26+00:00

EFI can provide PCI ROMs out of band via boot services, which may not be
available after boot. Add support for using the data handed off to us by
the boot stub or bootloader.

[bhelgaas: added Seth's boot_params section mismatch fix]
[bhelgaas: drop "boot_params.hdr.version < 0x0209" test]
Signed-off-by: Matthew Garrett 
Signed-off-by: Bjorn Helgaas 
Tested-by: Seth Forshee

Merge tag 'efi-for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

2012-10-26T08:17:38+00:00

Pull EFI fixes from Matt Fleming:

 "Fix oops with EFI variables on mixed 32/64-bit firmware/kernels and
  document EFI git repository location on kernel.org."

Conflicts:
	arch/x86/include/asm/efi.h

Signed-off-by: Ingo Molnar

x86: efi: Turn off efi_enabled after setup on mixed fw/kernel

2012-10-25T18:09:40+00:00

When 32-bit EFI is used with 64-bit kernel (or vice versa), turn off
efi_enabled once setup is done. Beyond setup, it is normally used to
determine if runtime services are available and we will have none.

This will resolve issues stemming from efivars modprobe panicking on a
32/64-bit setup, as well as some reboot issues on similar setups.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=45991

Reported-by: Marko Kohtala 
Reported-by: Maxim Kammerer 
Signed-off-by: Olof Johansson 
Acked-by: Maarten Lankhorst 
Cc: stable@kernel.org # 3.4 - 3.6
Cc: Matthew Garrett 
Signed-off-by: Matt Fleming

x86, mm: Use memblock memory loop instead of e820_RAM

2012-10-24T18:52:36+00:00

We need to handle E820_RAM and E820_RESERVED_KERNEL at the same time.

Also memblock has page aligned range for ram, so we could avoid mapping
partial pages.

Signed-off-by: Yinghai Lu 
Link: http://lkml.kernel.org/r/CAE9FiQVZirvaBMFYRfXMmWEcHbKSicQEHz4VAwUv0xFCk51ZNw@mail.gmail.com
Acked-by: Jacob Shin 
Signed-off-by: H. Peter Anvin 
Cc:

Merge commit '5bc66170dc486556a1e36fd384463536573f4b82' into x86/urgent

2012-10-19T14:55:09+00:00

From Borislav Petkov :

Below is a RAS fix which reverts the addition of a sysfs attribute
which we agreed is not needed, post-factum. And this should go in now
because that sysfs attribute is going to end up in 3.7 otherwise and
thus exposed to userspace; removing it then would be a lot harder.

This is done as a merge rather than a simple patch/cherry-pick since
the baseline for this patch was not in the previous x86/urgent.

Signed-off-by: H. Peter Anvin