linux-toradex.git/arch/mips/kernel/irq_cpu.c, branch v3.9.2

Merge branch 'mips-next-3.9' of git://git.linux-mips.org/pub/scm/john/linux-john into mips-for-linux-next

2013-02-21T11:51:33+00:00

MIPS: add irqdomain support for the CPU IRQ controller

2013-02-17T00:25:34+00:00

Add code to load a irq_domain for the MIPS IRQ controller from a devicetree
file.

Signed-off-by: Gabor Juhos 
Signed-off-by: John Crispin 
Acked-by: David Daney 
Patchwork: http://patchwork.linux-mips.org/patch/4902/

MIPS: Whitespace cleanup.

2013-02-01T09:00:22+00:00

Having received another series of whitespace patches I decided to do this
once and for all rather than dealing with this kind of patches trickling
in forever.

Signed-off-by: Ralf Baechle

Disintegrate asm/system.h for MIPS

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for MIPS.

Signed-off-by: David Howells 
Acked-by: Ralf Baechle 
cc: linux-mips@linux-mips.org

MIPS: Install handlers for software IRQs

2011-07-25T16:26:54+00:00

BMIPS4350/4380/5000 CMT/SMT all use SW INT0/INT1 for inter-thread
signaling.

Signed-off-by: Kevin Cernekee 
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1709/
Signed-off-by: Ralf Baechle

MIPS: Convert the irq functions to the new names

2011-03-29T12:48:07+00:00

Scripted with coccinelle.

Signed-off-by: Thomas Gleixner

MIPS: irq_cpu: Convert to new irq_chip functions

2011-03-25T17:45:17+00:00

Signed-off-by: Thomas Gleixner 
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2191/
Signed-off-by: Ralf Baechle

MIPS: Add missing #inclusions of

2010-10-07T13:08:54+00:00

Add missing #inclusions of  to a whole bunch of files that should
really include it.  Note that this can replace #inclusions of .

This is required for the patch to sort out irqflags handling function naming to
compile on MIPS.

The problem is that these files require access to things like setup_irq() -
which isn't available by #including 

Signed-off-by: David Howells 
Acked-by: Ralf Baechle

MIPS: Enable GENERIC_HARDIRQS_NO__DO_IRQ for all platforms

2009-03-30T12:49:44+00:00

__do_IRQ() is deprecated and will go away.

Signed-off-by: Ralf Baechle

[MIPS] irq_cpu: use handle_percpu_irq handler to avoid dropping interrupts.

2007-11-15T23:21:52+00:00

This matters to any sort of device that is wired to one of the CPU
interrupt pins on an SMP system.  Typically the scenario is most easily
triggered with the count/compare timer interrupt where the same interrupt
number and thus irq_desc is used on each processor.

   CPU A			CPU B

   do_IRQ()
   generic_handle_irq()
   handle_level_irq()
   spin_lock(desc_lock)
   set IRQ_INPROGRESS
   spin_unlock(desc_lock)
				do_IRQ()
				generic_handle_irq()
				handle_level_irq()
				spin_lock(desc_lock)
				IRQ_INPROGRESS set => bail out
   spin_lock(desc_lock)
   clear IRQ_INPROGRESS
   spin_unlock(desc_lock)

In case of the cp0 compare interrupt this means the interrupt will be
acked and not handled or re-armed on CPU b, so there won't be any timer
interrupt until the count register wraps around.

With kernels 2.6.20 ... 2.6.23 we usually were lucky that things were just
working right on VSMP because the count registers are synchronized on
bootup so it takes something that disables interrupts for a long time on
one processor to trigger this one.

For scenarios where an interrupt is multicasted or broadcasted over several
CPUs the existing code was safe and the fix will break it.  There is no
way to know in the interrupt controller code because it is abstracted from
the platform code.  I think we do not have such a setup currently, so this
should be ok.

Signed-off-by: Ralf Baechle