linux-toradex.git/kernel/irq/internals.h, branch v4.3.2

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

Merge branch 'linus' into irq/core

2015-07-29T22:13:24+00:00

Pull in upstream fixes before applying conflicting changes

genirq: Remove irq argument from enable/disable_irq()

2015-07-11T21:14:24+00:00

Solely used for debug output. Can be retrieved from irq descriptor if
necessary.

[ tglx: Split out from combo patch ]

Signed-off-by: Jiang Liu 
Signed-off-by: Thomas Gleixner

genirq: Remove irq arg from __irq_set_trigger()

2015-07-11T21:14:24+00:00

It's only required for debug output and can be retrieved from the irq
descriptor if necessary.

[ tglx: Split out from combo patch ]

Signed-off-by: Jiang Liu 
Signed-off-by: Thomas Gleixner

genirq: Remove the irq argument from check_irq_resend()

2015-07-11T21:14:24+00:00

It's only used in the software resend case and can be retrieved from
irq_desc if necessary.

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 
Link: http://lkml.kernel.org/r/1433391238-19471-18-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Remove the parameter 'irq' of kstat_incr_irqs_this_cpu()

2015-07-11T21:14:24+00:00

The first parameter 'irq' is never used by
kstat_incr_irqs_this_cpu(). Remove it.

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 
Link: http://lkml.kernel.org/r/1433391238-19471-16-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

hotplug: Prevent alloc/free of irq descriptors during cpu up/down

2015-07-08T09:32:25+00:00

When a cpu goes up some architectures (e.g. x86) have to walk the irq
space to set up the vector space for the cpu. While this needs extra
protection at the architecture level we can avoid a few race
conditions by preventing the concurrent allocation/free of irq
descriptors and the associated data.

When a cpu goes down it moves the interrupts which are targeted to
this cpu away by reassigning the affinities. While this happens
interrupts can be allocated and freed, which opens a can of race
conditions in the code which reassignes the affinities because
interrupt descriptors might be freed underneath.

Example:

CPU1				CPU2
cpu_up/down
 irq_desc = irq_to_desc(irq);
				remove_from_radix_tree(desc);
 raw_spin_lock(&desc->lock);
				free(desc);

We could protect the irq descriptors with RCU, but that would require
a full tree change of all accesses to interrupt descriptors. But
fortunately these kind of race conditions are rather limited to a few
things like cpu hotplug. The normal setup/teardown is very well
serialized. So the simpler and obvious solution is:

Prevent allocation and freeing of interrupt descriptors accross cpu
hotplug.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Cc: xiao jin 
Cc: Joerg Roedel 
Cc: Borislav Petkov 
Cc: Yanmin Zhang 
Link: http://lkml.kernel.org/r/20150705171102.063519515@linutronix.de

genirq: Introduce helper function irq_data_get_node()

2015-06-12T14:54:21+00:00

Introduce helper function irq_data_get_node() and variants thereof to
hide struct irq_data implementation details.

Convert the core code to use them.

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/1433145945-789-5-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Introduce struct irq_common_data to host shared irq data

2015-06-12T14:54:21+00:00

With the introduction of hierarchy irqdomain, struct irq_data becomes
per-chip instead of per-irq and there may be multiple irq_datas
associated with the same irq. Some per-irq data stored in struct
irq_data now may get duplicated into multiple irq_datas, and causes
inconsistent view.

So introduce struct irq_common_data to host per-irq common data and to
achieve consistent view among irq_chips.

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/1433145945-789-4-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

genirq: Enhance irq_data_to_desc() to support hierarchy irqdomain

2015-06-12T14:54:21+00:00

For irq associated with hierarchy irqdomains, there will be multiple
irq_datas for one irq_desc. So enhance irq_data_to_desc() to support
hierarchy irqdomain. Also export irq_data_to_desc() as an inline
function for later reuse.

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: Marc Zyngier 
Link: http://lkml.kernel.org/r/1433145945-789-2-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner

linux-toradex.git/kernel/irq/internals.h, branch v4.3.2

genirq: Move field 'node' from irq_data into irq_common_data

Merge branch 'linus' into irq/core

genirq: Remove irq argument from __enable/__disable_irq()

genirq: Remove irq arg from __irq_set_trigger()

genirq: Remove the irq argument from check_irq_resend()

genirq: Remove the parameter 'irq' of kstat_incr_irqs_this_cpu()

hotplug: Prevent alloc/free of irq descriptors during cpu up/down

genirq: Introduce helper function irq_data_get_node()

genirq: Introduce struct irq_common_data to host shared irq data

genirq: Enhance irq_data_to_desc() to support hierarchy irqdomain

genirq: Remove irq argument from enable/disable_irq()