All non threadeable interrupts are marked. Enable forced irq threading
support.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

These cannot be threaded.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

The caller of ioapic_register_intr() has a pointer to the irq_cfg for
the irq already. Hand it in to avoid a full lookup.

In msi_compose_msg() the pointer to irq_cfg is already available. No
need to look it up again.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Use the functions which take irq_data. We already have a pointer to
irq_data. That avoids a sparse irq lookup in move_*_irq.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Use the state information in irq_data. That avoids a radix-tree lookup
from apic_ack_level() and simplifies setup_ioapic_dest().
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Use pointers instead of ugly multiline if/else constructs.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

genirq is switching to a consistent name space for the irq related
functions. Convert x86. Conversion was done with coccinelle.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Reason: Enabling irq threads and update to latest genirq functionality
	requires the core code
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Reason: Update to latest genirq code conflicts with pending apic
	changes
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

On suspend we disable all interrupts in the core code, but this does
not mask the interrupt line in the default implementation as we use a
lazy disable approach. That means we mark the interrupt disabled, but
leave the hardware unmasked. That's an optimization because we avoid
the hardware access for the common case where no interrupt happens
after we marked it disabled. If an interrupt happens, then the
interrupt flow handler masks the line at the hardware level and marks
it pending.

Suspend makes use of this delayed disable as it "disables" all
interrupts when preparing the suspend transition. Right before the
system goes into hardware suspend state it checks whether one of the
interrupts which is marked as a wakeup interrupt came in after
disabling it.

Most interrupt chips have a separate register which selects the
interrupts which can wake up the system from suspend, so we don't have
to mask any on the non wakeup interrupts.

But now we have to deal with brilliant designed hardware which lacks
such a wakeup configuration facility. For such hardware it's necessary
to mask all non wakeup interrupts before going into suspend in order
to avoid the wakeup from random interrupts.

Rather than working around this in the affected interrupt chip
implementations we can solve this elegant in the core code itself.

Add a flag IRQCHIP_MASK_ON_SUSPEND which can be set by the irq chip
implementation to indicate, that the interrupts which are not selected
as wakeup sources must be masked in the suspend path. Mask them in the
loop which checks the wakeup interrupts pending flag.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NAbhijeet Dharmapurikar <adharmap@codeaurora.org>
LKML-Reference: <alpine.LFD.2.00.1103112112310.2787@localhost6.localdomain6>

We have accessors for all fields in irq_data based on irq_desc, but
not for irq_data itself.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Sam Ravnborg <sam@ravnborg.org>

The fasteoi handler must mask the interrupt line in oneshot mode
otherwise we end up with an irq storm.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Add a commandline parameter "threadirqs" which forces all interrupts except
those marked IRQF_NO_THREAD to run threaded. That's mostly a debug option to
allow retrieving better debug data from crashing interrupt handlers. If
"threadirqs" is not enabled on the kernel command line, then there is no
impact in the interrupt hotpath.

Architecture code needs to select CONFIG_IRQ_FORCED_THREADING after
marking the interrupts which cant be threaded IRQF_NO_THREAD. All
interrupts which have IRQF_TIMER set are implict marked
IRQF_NO_THREAD. Also all PER_CPU interrupts are excluded.

Forced threading hard interrupts also forces all soft interrupt
handling into thread context.

When enabled it might slow down things a bit, but for debugging problems in
interrupt code it's a reasonable penalty as it does not immediately
crash and burn the machine when an interrupt handler is buggy.

Some test results on a Core2Duo machine:

Cache cold run of:
 # time git grep irq_desc

      non-threaded       threaded
 real 1m18.741s          1m19.061s
 user 0m1.874s           0m1.757s
 sys  0m5.843s           0m5.427s

 # iperf -c server
non-threaded
[  3]  0.0-10.0 sec  1.09 GBytes   933 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   934 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   933 Mbits/sec
threaded
[  3]  0.0-10.0 sec  1.09 GBytes   939 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   934 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   937 Mbits/sec
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110223234956.772668648@linutronix.de>

When we force thread hard and soft interrupts the startup of ksoftirqd
would hang in kthread_bind() when wait_task_inactive() calls
schedule_timeout_uninterruptible() because there is no softirq yet
which will wake us up.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110223234956.677109139@linutronix.de>

Some low level interrupts cannot be threaded even when we force thread
all interrupt handlers. Add a flag to annotate such interrupts. Add
all timer interrupts to this category by default.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110223234956.578893460@linutronix.de>

Support ONESHOT on shared interrupts, if all drivers agree on it.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110223234956.483640430@linutronix.de>

For level type interrupts we need to track how many threads are on
flight to avoid useless interrupt storms when not all thread handlers
have finished yet. Keep track of the woken threads and only unmask
when there are no more threads in flight.

Yes, I'm lazy and using a bitfield. But not only because I'm lazy, the
main reason is that it's way simpler than using a refcount. A refcount
based solution would need to keep track of various things like
crashing the irq thread, spurious interrupts coming in,
disables/enables, free_irq() and some more. The bitfield keeps the
tracking simple and makes things just work. It's also nicely confined
to the thread code pathes and does not require additional checks all
over the place.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110223234956.388095876@linutronix.de>

The WARN_ON_ONCE in handle_percpu_event() which emits a warning when
an action handler returns with interrupts enabled is not really
useful. It does not reveal the interrupt number and handler function
which caused it. Make it WARN_ONCE() and add the information.
Reported-by: NTony Luck <tony.luck@intel.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Required for devicetree based io_apic configuration.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

io_apic_set_pci_routing() and mp_save_irq() check the pin_programmed
bit before calling io_apic_setup_irq_pin() and set the bit when the
pin was setup.

Move that duplicated code into a separate function and use it.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

There is no point to have irq_trigger() and irq_polarity() as wrappers
around the MPBIOS_* camel case functions. Get rid of both the inlines
and the ugly camel case.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

No users outside of io_apic.c. Mark bad_ioapic() __init while at it.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Another version of the same thing. Only set the pin programmed, when
the setup function succeeds.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Replace the duplicated code.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

The only difference here is that we did not call
__add_pin_to_irq_node() for the legacy irqs, but that's not worth 30
lines of extra code.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Remove the duplicated code and call the function. It does not matter
whether we allocated the cfg before calling setup_local_APIC() and we
can set the irq chip and handler after that as well.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

There are about four places in the ioapic code which do exactly the
same setup sequence. Also the OF based ioapic setup needs that
function to avoid putting the OF specific code into ioapic.c
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Two consecutive

    for(...)
    for(...)

lines to avoid an extra indentation are just horrible to read. I had
to look more than once to figure out what the code is doing.

Split out the inner loop into a separate function.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

This is debug code and it does not matter at all whether we print each
not connected pin in an extra line or try to be extra clever.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Since commit 7cd92366
lAPIC enabled accidently the IOAPIC, which now gets fixed.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-5-git-send-email-henne@nachtwindheim.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This patch adds IOAPIC dummy functions for compilation
with local APIC, but without IOAPIC.

The local variable ioapic_entries in enable_IR_x2apic()
does not need initialization anymore, since the dummy
returns NULL.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-4-git-send-email-henne@nachtwindheim.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Currently arch_disable_smp_support() on x86 disables only the
support for the IOAPIC and is also compiled in if SMP-support is
not.

Therefore this function is renamed to disable_ioapic_support(),
which meets its purpose and is only compiled in the kernel
when IOAPIC support is also.

A new arch_disable_smp_support() is created in smpboot.c,
which calls disable_ioapic_support() and gets only compiled
in the kernel when SMP support is also.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-3-git-send-email-henne@nachtwindheim.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This is a dummy function, used when no IOAPIC is compiled in.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-2-git-send-email-henne@nachtwindheim.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This enum is used by non IOAPIC code, so apicdef.h is
the best place for it.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-1-git-send-email-henne@nachtwindheim.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

"def_bool n" without prompt is pointless, these should be just "bool".

[ tglx: Adapted to latest changes ]
Signed-off-by: NJan Beulich <jbeulich@novell.com>
LKML-Reference: <4D5D3309020000780003264A@vpn.id2.novell.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

note_interrupt wants to be called with the combined result of all
handlers called, not with the last one. If it's a shared interrupt
then the last handler might return IRQ_NONE often enough to trigger
the spurious dectector which turns off a perfectly fine working
interrupt line. Bug was introduced in commit 1277a532(genirq: Simplify
handle_irq_event()).

Yes, I really messed up there. First the variable ret should not have
been named differently to avoid similarity with retval. Second it
should have been declared in the do {} loop.

Rename it to res and move it into the do {} loop and vanish under a
huge brown paperbag.
Reported-bisected-tested-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>