linux-toradex.git/arch/mips/kernel/irq_cpu.c, branch v3.1.2

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

[MIPS] use name instead of typename for each irq_chip

2007-02-06T16:53:14+00:00

The "typename" field was obsoleted by the "name" field.

Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle

[MIPS] Define MIPS_CPU_IRQ_BASE in generic header

2007-02-06T16:53:08+00:00

The irq_base for {mips,rm7k,rm9k}_cpu_irq_init() are constant on all
platforms and are same value on most platforms (0 or 16, depends on
CONFIG_I8259).  Define them in asm-mips/mach-generic/irq.h and make
them customizable.  This will save a few cycle on each CPU interrupt.

A good side effect is removing some dependencies to MALTA in generic
SMTC code.

Although MIPS_CPU_IRQ_BASE is customizable, this patch changes irq
mappings on DDB5477, EMMA2RH and MIPS_SIM, since really customizing
them might cause some header dependency problem and there seems no
good reason to customize it.  So currently only VR41XX is using custom
MIPS_CPU_IRQ_BASE value, which is 0 regardless of CONFIG_I8259.

Testing this patch on those platforms is greatly appreciated.  Thank
you.

Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle

[MIPS] Compile __do_IRQ() when really needed

2006-12-06T20:16:08+00:00

__do_IRQ() is needed only by irq handlers that can't use
default handlers defined in kernel/irq/chip.c.

For others platforms there's no need to compile this function
since it won't be used. For those platforms this patch defines
GENERIC_HARDIRQS_NO__DO_IRQ symbol which is used exactly for
this purpose.

Futhermore for platforms which do not use __do_IRQ(), end()
method which is part of the 'irq_chip' structure is not used.
This patch simply removes this method in this case.

Signed-off-by: Franck Bui-Huu 
Signed-off-by: Ralf Baechle

[MIPS] use generic_handle_irq, handle_level_irq, handle_percpu_irq

2006-11-30T01:14:46+00:00

Further incorporation of generic irq framework.  Replacing __do_IRQ()
by proper flow handler would make the irq handling path a bit simpler
and faster.

* use generic_handle_irq() instead of __do_IRQ().
* use handle_level_irq for obvious level-type irq chips.
* use handle_percpu_irq for irqs marked as IRQ_PER_CPU.
* setup .eoi routine for irq chips possibly used with handle_percpu_irq.

Signed-off-by: Atsushi Nemoto 
Signed-off-by: Ralf Baechle