linux-toradex.git/include/linux/irq.h, branch v4.4.93

genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers

2016-09-24T08:07:43+00:00

commit ebf9ff753c041b296241990aef76163bbb2cc9c8 upstream.

Some irqchip drivers need to take the generic chip lock outside of the
irq context.

Provide the irq_gc_{lock_irqsave,unlock_irqrestore}() helpers to allow
one to disable irqs while entering a critical section protected by
gc->lock.

Note that we do not provide optimized version of these helpers for !SMP,
because they are not called from the hot-path.

[ tglx: Added a comment when these helpers should be [not] used ]

Signed-off-by: Boris Brezillon 
Cc: Jason Cooper 
Cc: Marc Zyngier 
Cc: Nicolas Ferre 
Cc: Alexandre Belloni 
Link: http://lkml.kernel.org/r/1473775109-4192-1-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

genirq: Add flag to force mask in disable_irq[_nosync]()

2015-10-11T09:33:42+00:00

If an irq chip does not implement the irq_disable callback, then we
use a lazy approach for disabling the interrupt. That means that the
interrupt is marked disabled, but the interrupt line is not
immediately masked in the interrupt chip. It only becomes masked if
the interrupt is raised while it's marked disabled. We use this to avoid
possibly expensive mask/unmask operations for common case operations.

Unfortunately there are devices which do not allow the interrupt to be
disabled easily at the device level. They are forced to use
disable_irq_nosync(). This can result in taking each interrupt twice.

Instead of enforcing the non lazy mode on all interrupts of a irq
chip, provide a settings flag, which can be set by the driver for that
particular interrupt line.

Reported-and-tested-by: Duc Dang 
Signed-off-by: Thomas Gleixner 
Cc: Marc Zyngier 
Cc: Jason Cooper 
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1510092348370.6097@nanos

genirq: Remove unused functions irqd_[set|clr]_chained_irq_inprogress()

2015-10-01T15:28:28+00:00

These two functions are not used anywhere in the kernel source tree so
remove them.

Signed-off-by: Mika Westerberg 
Cc: Jiang Liu 
Link: http://lkml.kernel.org/r/1443704093-36837-2-git-send-email-mika.westerberg@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Fix typo in documentation of enumeration field name

2015-10-01T15:28:28+00:00

It should say IRQ_NESTED_THREAD instead of IRQ_NESTED_TRHEAD.

Signed-off-by: Mika Westerberg 
Cc: Jiang Liu 
Link: http://lkml.kernel.org/r/1443704093-36837-1-git-send-email-mika.westerberg@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Introduce generic irq migration for cpu hotunplug

2015-10-01T12:51:15+00:00

ARM and ARM64 have almost identical code for migrating interrupts on
cpu hotunplug. Provide a generic version which can be used by both.

The new code addresses a shortcoming in the ARM[64] variants which
fails to update the affinity change in some cases. The solution for
this is to use the core function irq_do_set_affinity() instead of open
coding it.

[ tglx: Added copyright notice and license boilerplate. Rewrote
  	subject and changelog. ]

Signed-off-by: Yang Yingliang 
Acked-by: Russell King - ARM Linux 
Cc: Jiang Liu 
Cc: Marc Zyngier 
Cc: Mark Rutland 
Cc: Will Deacon 
Cc: Hanjun Guo 
Cc: 
Link: http://lkml.kernel.org/r/1443087135-17044-2-git-send-email-yangyingliang@huawei.com
Signed-off-by: Thomas Gleixner

genirq: Remove irq argument from irq flow handlers

2015-09-16T13:47:51+00:00

Most interrupt flow handlers do not use the irq argument. Those few
which use it can retrieve the irq number from the irq descriptor.

Remove the argument.

Search and replace was done with coccinelle and some extra helper
scripts around it. Thanks to Julia for her help!

Signed-off-by: Thomas Gleixner 
Cc: Julia Lawall 
Cc: Jiang Liu

genirq: Move field 'msi_desc' from irq_data into irq_common_data

2015-09-16T13:46:49+00:00

MSI descriptors are per-irq instead of per irqchip, so move it into
struct irq_common_data.

Signed-off-by: Jiang Liu 
Cc: Konrad Rzeszutek Wilk 
Cc: Tony Luck 
Cc: Bjorn Helgaas 
Cc: Benjamin Herrenschmidt 
Cc: Randy Dunlap 
Cc: Yinghai Lu 
Cc: Borislav Petkov 
Cc: Jason Cooper 
Cc: Kevin Cernekee 
Cc: Arnd Bergmann 
Cc: Marc Zyngier 
Link: http://lkml.kernel.org/r/1433145945-789-35-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Move field 'affinity' from irq_data into irq_common_data

2015-09-16T13:46:49+00:00

Irq affinity mask is per-irq instead of per irqchip, so move it into
struct irq_common_data.

Signed-off-by: Jiang Liu 
Cc: Konrad Rzeszutek Wilk 
Cc: Tony Luck 
Cc: Bjorn Helgaas 
Cc: Benjamin Herrenschmidt 
Cc: Randy Dunlap 
Cc: Yinghai Lu 
Cc: Borislav Petkov 
Cc: Jason Cooper 
Cc: Kevin Cernekee 
Cc: Arnd Bergmann 
Link: http://lkml.kernel.org/r/1433303281-27688-1-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Move field 'handler_data' from irq_data into irq_common_data

2015-09-16T13:46:49+00:00

Handler data (handler_data) is per-irq instead of per irqchip, so move
it into struct irq_common_data.

Signed-off-by: Jiang Liu 
Cc: Konrad Rzeszutek Wilk 
Cc: Tony Luck 
Cc: Bjorn Helgaas 
Cc: Benjamin Herrenschmidt 
Cc: Randy Dunlap 
Cc: Yinghai Lu 
Cc: Borislav Petkov 
Cc: Jason Cooper 
Cc: Kevin Cernekee 
Cc: Arnd Bergmann 
Cc: Marc Zyngier 
Link: http://lkml.kernel.org/r/1433145945-789-13-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Move field 'node' from irq_data into irq_common_data

2015-09-16T13:46:49+00:00

NUMA node information is per-irq instead of per-irqchip, so move it into
struct irq_common_data. Also use CONFIG_NUMA to guard irq_common_data.node.

Signed-off-by: Jiang Liu 
Cc: Konrad Rzeszutek Wilk 
Cc: Tony Luck 
Cc: Bjorn Helgaas 
Cc: Benjamin Herrenschmidt 
Cc: Randy Dunlap 
Cc: Yinghai Lu 
Cc: Borislav Petkov 
Cc: Jason Cooper 
Cc: Kevin Cernekee 
Cc: Arnd Bergmann 
Link: http://lkml.kernel.org/r/1433145945-789-8-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner