Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

- use physid_set instead of phys_cpu and physids_or
- set phys_cpu_present_map bit AFTER check for allowed
  number of processors
- add checking for APIC valid version in 64bit mode
  (mostly not needed but added for merging purpose)
- add apic_version definition for 64bit mode which
  is used now
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

- just #ifdef added
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

We use 32bit code former for 64bit
mode since it's much better implementation
and easier to merge.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Rearrange functions and comments to find differences
easier.

Also use apic_printk in setup_boot_APIC_clock for
64bit mode.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

- Remove redundant masking of APIC_LVTTHMR register in apic_32.c

- Add masking of APIC_LVTTHMR register to apic_64.c. We use a bit
  complicated #ifdef here: CONFIG_X86_MCE_P4THERMAL is 32bit specific
  and X86_MCE_INTEL is 64bit specific so the appropriate config variable
  will be set by Kconfig.

- the APIC_ESR register clearing in apic_64.c now uses not straightforward
  way but this is allowed tradeoff.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

- remove redundant read of APIC_LVR register in 64bit mode
- APIC is always integrated for 64bit mode so
  gcc will eliminate lapic_is_integrated call
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Acked-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

No changes on binary level
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Acked-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

To be able to unify this function we RE-introduce
APIC_DIVISOR for 64bit mode. This snipped was eliminated
in some time ago in a sake of clenup but now we need it
again since it allow up to get rid of #ifdef(s).

And lapic_is_integrated call is added in apic_64.c but
since we always have APIC integrated on 64bit cpu compiler
will ignore this call.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Get rid of local_apic_timer_disabled and use disable_apic_timer instead.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

No code change on binary level.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Signed-off-by: NIngo Molnar <mingo@elte.hu>

No code change on binary level.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Signed-off-by: NIngo Molnar <mingo@elte.hu>

... so don't need to call clear_cpu_cap again in early_identify_cpu,
and could use cleared_cpu_caps like other places.
Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

On Fri, Jul 18, 2008 at 02:03:48PM -0700, Ingo Molnar wrote:
>
> * Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>
> > > git merge tip/x86/x2apic
> > CONFLICT (content): Merge conflict in arch/x86/kernel/Makefile
> > CONFLICT (content): Merge conflict in arch/x86/kernel/paravirt.c
> > CONFLICT (content): Merge conflict in arch/x86/kernel/smpboot.c
> > CONFLICT (content): Merge conflict in arch/x86/kernel/vmi_32.c
> > CONFLICT (content): Merge conflict in arch/x86/xen/enlighten.c
> > CONFLICT (content): Merge conflict in include/asm-x86/apic.h
> > CONFLICT (content): Merge conflict in include/asm-x86/paravirt.h
>
> that's due to the changes in tip/x86/apic and in tip/x86/uv.
>
> ok, i've just merged x86/apic into x86/x2apic and x86/uv as well, and
> pushed out the result.
>
> Note: it's a first raw merge and completely untested. It will now merge
> cleanly into tip/master. There are probably a few details missing.

Ingo, thanks for doing this. While I was testing my merge changes, you posted
yours... anyhow we need this piece, which is missing from your merge.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Zachary Amsden <zach@vmware.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

As a microoptimisation, make apic_verbosity unsigned.  This will make
apic_printk(APIC_QUIET, ...) expand into just printk(...) with the
surrounding condition and a reference to apic_verbosity removed.
Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Make calibration_result to return error and check calibration_result
to be sufficient inside calibrate_APIC_clock.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Cc: yhlu.kernel@gmail.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

also remove GET_APIC_ID when read_apic_id is used.

need to apply after
	[PATCH] x86: mach_apicdef.h need to include before smp.h
Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

x2apic support.  Interrupt-remapping must be enabled before enabling x2apic,
this is needed to ensure that IO interrupts continue to work properly after the
cpu mode is changed to x2apic(which uses 32bit extended physical/cluster
apic id).

On systems where apicid's are > 255, BIOS can handover the control to OS in
x2apic mode. Or if the OS handover was in legacy xapic mode, check
if it is capable of x2apic mode. And if we succeed in enabling
Interrupt-remapping, then we can enable x2apic mode in the CPU.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

IO-APIC support in the presence of interrupt-remapping infrastructure.

IO-APIC RTE will be programmed with interrupt-remapping table entry(IRTE)
index and the IRTE will contain information about the vector, cpu destination,
trigger mode etc, which traditionally was present in the IO-APIC RTE.

Introduce a new irq_chip for cleaner irq migration (in the process
context as opposed to the current irq migration in the context of an interrupt.
interrupt-remapping infrastructure will help us achieve this cleanly).

For edge triggered, irq migration is a simple atomic update(of vector
and cpu destination) of IRTE and flush the hardware cache.

For level triggered, we need to modify the io-apic RTE aswell with the update
vector information, along with modifying IRTE with vector and cpu destination.
So irq migration for level triggered is little  bit more complex compared to
edge triggered migration. But the good news is, we use the same algorithm
for level triggered migration as we have today, only difference being,
we now initiate the irq migration from process context instead of the
interrupt context.

In future, when we do a directed EOI (combined with cpu EOI broadcast
suppression) to the IO-APIC, level triggered irq migration will also be
as simple as edge triggered migration and we can do the irq migration
with a simple atomic update to IO-APIC RTE.

TBD: some tests/changes needed in the presence of fixup_irqs() for
level triggered irq migration.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

x2apic ops for x2apic mode support. This uses MSR interface and differs
slightly from the xapic register layout.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Introduce basic apic operations which handle the apic programming. This
will be used later to introduce another specific operations for x2apic.

For the perfomance critial accesses like IPI's, EOI etc, we use the
native operations as they are already referenced by different
indirections like genapic, irq_chip etc.

64bit Paravirt ops can also define their apic operations accordingly.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Yinghai Lu wrote:

> Setting APIC routing to physical flat
> Kernel panic - not syncing: Boot APIC ID in local APIC unexpected (0 vs 4)
> Pid: 1, comm: swapper Not tainted 2.6.26-rc9-tip-01763-g74f94b1-dirty #320
>
> Call Trace:
>  [<ffffffff80a21505>] ? set_cpu_sibling_map+0x38c/0x3bd
>  [<ffffffff80245215>] ? read_xapic_id+0x25/0x3e
>  [<ffffffff80e5a2c3>] ? verify_local_APIC+0x139/0x1b9
>  [<ffffffff80245215>] ? read_xapic_id+0x25/0x3e
>  [<ffffffff80e589af>] ? native_smp_prepare_cpus+0x224/0x2e9
>  [<ffffffff80e4881a>] ? kernel_init+0x64/0x341
>  [<ffffffff8022a439>] ? child_rip+0xa/0x11
>  [<ffffffff80e487b6>] ? kernel_init+0x0/0x341
>  [<ffffffff8022a42f>] ? child_rip+0x0/0x11
>
>
> guess read_apic_id changing cuase some problem...

genapic's read_apic_id() returns the actual apic id extracted from
the APIC_ID register. And in some cases like UV, read_apic_id()
returns completely different values from APIC ID register.

Use the native apic register read, rather than genapic read_apic_id()
in verify_local_APIC()

And also, lapic_suspend() should also use native apic register read.
Reported-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: "akpm@linux-foundation.org" <akpm@linux-foundation.org>
Cc: "arjan@linux.intel.com" <arjan@linux.intel.com>
Cc: "andi@firstfloor.org" <andi@firstfloor.org>
Cc: "ebiederm@xmission.com" <ebiederm@xmission.com>
Cc: "jbarnes@virtuousgeek.org" <jbarnes@virtuousgeek.org>
Cc: "steiner@sgi.com" <steiner@sgi.com>
Cc: "jeremy@goop.org" <jeremy@goop.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Move the read_apic_id()  to genapic routines.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>

There is no need to keep NMI_DISABLED definition and use it
for nmi_watchdog by default. Here is the point why:

- IO-APIC and APIC chips are programmed for nmi_watchdog support at very
  early stage of kernel booting and not having nmi_watchdog specified as
  boot option lead only to nmi_watchdog becomes to NMI_NONE anyway
- enable nmi_watchdog thru /proc/sys/kernel/nmi if it was not specified at
  boot is not possible too (even having this sysfs entry)
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Since it is possible NMI_ definitions could be changed
one day we better print out real nmi_watchdog value instead
of constant string.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: macro@linux-mips.org
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Although it is not really needed, we provide it to get
closer to i386. ifdefs around it are removed in smpboot.c
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>