linux-toradex.git/arch/x86/kernel/reboot.c, branch v4.2.7

x86/reboot: Add ASRock Q1900DC-ITX mainboard reboot quirk

2015-04-01T12:08:09+00:00

The ASRock Q1900DC-ITX mainboard (Baytrail-D) hangs randomly in
both BIOS and UEFI mode while rebooting unless reboot=pci is
used. Add a quirk to reboot via the pci method.

The problem is very intermittent and hard to debug, it might succeed
rebooting just fine 40 times in a row - but fails half a dozen times
the next day. It seems to be slightly less common in BIOS CSM mode
than native UEFI (with the CSM disabled), but it does happen in either
mode. Since I've started testing this patch in late january, rebooting
has been 100% reliable.

Most of the time it already hangs during POST, but occasionally it
might even make it through the bootloader and the kernel might even
start booting, but then hangs before the mode switch. The same symptoms
occur with grub-efi, gummiboot and grub-pc, just as well as (at least)
kernel 3.16-3.19 and 4.0-rc6 (I haven't tried older kernels than 3.16).
Upgrading to the most current mainboard firmware of the ASRock
Q1900DC-ITX, version 1.20, does not improve the situation.

( Searching the web seems to suggest that other Bay Trail-D mainboards
  might be affected as well. )
--
Signed-off-by: Stefan Lippers-Hollmann 
Cc: 
Cc: Matt Fleming 
Link: http://lkml.kernel.org/r/20150330224427.0fb58e42@mir
Signed-off-by: Ingo Molnar

x86, irq: Move IOAPIC related declarations from hw_irq.h into io_apic.h

2014-12-16T13:08:17+00:00

Clean up code by moving IOAPIC related declarations from hw_irq.h into
io_apic.h.

Signed-off-by: Jiang Liu 
Cc: Konrad Rzeszutek Wilk 
Cc: Tony Luck 
Cc: Joerg Roedel 
Cc: Greg Kroah-Hartman 
Cc: H. Peter Anvin 
Cc: Benjamin Herrenschmidt 
Cc: Rafael J. Wysocki 
Cc: Bjorn Helgaas 
Cc: Randy Dunlap 
Cc: Yinghai Lu 
Cc: Borislav Petkov 
Cc: Prarit Bhargava 
Cc: Grant Likely 
Cc: Vivek Goyal 
Cc: Baoquan He 
Cc: Matt Fleming 
Cc: Fenghua Yu 
Cc: Christian Gmeiner 
Cc: Aubrey 
Cc: Ryan Desfosses 
Cc: Quentin Lambert 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1414397531-28254-14-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag

2014-07-18T20:23:52+00:00

It appears that the BayTrail-T class of hardware requires EFI in order
to powerdown and reboot and no other reliable method exists.

This quirk is generally applicable to all hardware that has the ACPI
Hardware Reduced bit set, since usually ACPI would be the preferred
method.

Cc: Len Brown 
Cc: Mark Salter 
Cc: "Rafael J. Wysocki" 
Signed-off-by: Matt Fleming

efi/reboot: Add generic wrapper around EfiResetSystem()

2014-07-18T20:23:51+00:00

Implement efi_reboot(), which is really just a wrapper around the
EfiResetSystem() EFI runtime service, but it does at least allow us to
funnel all callers through a single location.

It also simplifies the callsites since users no longer need to check to
see whether EFI_RUNTIME_SERVICES are enabled.

Cc: Tony Luck 
Tested-by: Mark Salter 
Signed-off-by: Matt Fleming

x86/reboot: Add reboot quirk for Certec BPC600

2014-05-07T09:22:10+00:00

Certec BPC600 needs reboot=pci to actually reboot.

Signed-off-by: Christian Gmeiner 
Cc: Matthew Garrett 
Cc: Li Aubrey 
Cc: Andrew Morton 
Cc: Dave Jones 
Cc: Fenghua Yu 
Cc: Linus Torvalds 
Link: http://lkml.kernel.org/r/1399446114-2147-1-git-send-email-christian.gmeiner@gmail.com
Signed-off-by: Ingo Molnar

x86: Remove the PCI reboot method from the default chain

2014-04-16T06:56:09+00:00

Steve reported a reboot hang and bisected it back to this commit:

  a4f1987e4c54 x86, reboot: Add EFI and CF9 reboot methods into the default list

He heroically tested all reboot methods and found the following:

  reboot=t       # triple fault                  ok
  reboot=k       # keyboard ctrl                 FAIL
  reboot=b       # BIOS                          ok
  reboot=a       # ACPI                          FAIL
  reboot=e       # EFI                           FAIL   [system has no EFI]
  reboot=p       # PCI 0xcf9                     FAIL

And I think it's pretty obvious that we should only try PCI 0xcf9 as a
last resort - if at all.

The other observation is that (on this box) we should never try
the PCI reboot method, but close with either the 'triple fault'
or the 'BIOS' (terminal!) reboot methods.

Thirdly, CF9_COND is a total misnomer - it should be something like
CF9_SAFE or CF9_CAREFUL, and 'CF9' should be 'CF9_FORCE' ...

So this patch fixes the worst problems:

 - it orders the actual reboot logic to follow the reboot ordering
   pattern - it was in a pretty random order before for no good
   reason.

 - it fixes the CF9 misnomers and uses BOOT_CF9_FORCE and
   BOOT_CF9_SAFE flags to make the code more obvious.

 - it tries the BIOS reboot method before the PCI reboot method.
   (Since 'BIOS' is a terminal reboot method resulting in a hang
    if it does not work, this is essentially equivalent to removing
    the PCI reboot method from the default reboot chain.)

 - just for the miraculous possibility of terminal (resulting
   in hang) reboot methods of triple fault or BIOS returning
   without having done their job, there's an ordering between
   them as well.

Reported-and-bisected-and-tested-by: Steven Rostedt 
Cc: Li Aubrey 
Cc: Linus Torvalds 
Cc: Matthew Garrett 
Link: http://lkml.kernel.org/r/20140404064120.GB11877@gmail.com
Signed-off-by: Ingo Molnar

x86, reboot: Only use CF9_COND automatically, not CF9

2014-03-05T23:41:15+00:00

Only CF9_COND is appropriate for inclusion in the default chain, not
CF9; the latter will poke that register unconditionally, whereas
CF9_COND will at least look for PCI configuration method #1 or #2
first (a weak check, but better than nothing.)

CF9 should be used for explicit system configuration (command line or
DMI) only.

Cc: Aubrey Li 
Cc: Matthew Garrett 
Link: http://lkml.kernel.org/r/53130A46.1010801@linux.intel.com
Signed-off-by: H. Peter Anvin

x86, reboot: Add EFI and CF9 reboot methods into the default list

2014-03-05T23:27:07+00:00

Reboot is the last service linux OS provides to the end user. We are
supposed to make this function more robust than today. This patch adds
all of the known reboot methods into the default attempt list. The
machines requiring reboot=efi or reboot=p or reboot=bios get a chance
to reboot automatically now.

If there is a new reboot method emerged, we are supposed to add it to
the default list as well, instead of adding the endless dmidecode entry.

If one method required is in the default list in this patch but the
machine reboot still hangs, that means some methods ahead of the
required method cause the system hangs, then reboot the machine by
passing reboot= arguments and submit the reboot dmidecode table quirk.

We are supposed to remove the reboot dmidecode table from the kernel,
but to be safe, we keep it. This patch prevents us from adding more.
If you happened to have a machine listed in the reboot dmidecode
table and this patch makes reboot work on your machine, please submit
a patch to remove the quirk.

The default reboot order with this patch is now:

    ACPI > KBD > ACPI > KBD > EFI > CF9_COND > BIOS

Because BIOS and TRIPLE are mutually exclusive (either will either
work or hang the machine) that method is not included.

[ hpa: as with any changes to the reboot order, this patch will have
  to be monitored carefully for regressions. ]

Signed-off-by: Aubrey Li 
Acked-by: Matthew Garrett 
Link: http://lkml.kernel.org/r/53130A46.1010801@linux.intel.com
Signed-off-by: H. Peter Anvin

x86/apic, doc: Justification for disabling IO APIC before Local APIC

2013-12-05T03:33:21+00:00

Since erratum AVR31 in "Intel Atom Processor C2000 Product Family
Specification Update" is now published, I added a justification
comment for disabling IO APIC before Local APIC, as changed in commit:

522e66464467 x86/apic: Disable I/O APIC before shutdown of the local APIC

Signed-off-by: Fenghua Yu 
Link: http://lkml.kernel.org/r/1386202069-51515-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin

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

2013-11-12T02:33:38+00:00

Pull x86 reboot changes from Ingo Molnar:
 "Misc changes - the only one with functional impact should be commit
  16c21ae5ca63 ("reboot: Allow specifying warm/cold reset for CF9 boot
  type") which extends cold/warm reboot handling to the 0xCF9 reboot
  method"

* 'x86-reboot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/reboot: Correct pr_info() log message in the set_bios/pci/kbd_reboot()
  x86/reboot: Sort reboot DMI quirks by vendor
  x86/reboot: Remove the duplicate C6100 entry in the reboot quirks list
  reboot: Allow specifying warm/cold reset for CF9 boot type