linux-toradex.git/kernel/irq/irqdomain.c, branch v4.4.2

irqdomain: Introduce irq_domain_create_hierarchy

2015-10-13T17:01:25+00:00

As we're about to start converting the various MSI layers to
use fwnode_handle instead of device_node, add irq_domain_create_hierarchy
as a directly equivalent of irq_domain_add_hierarchy (which still
exists as a compatibility interface).

Signed-off-by: Marc Zyngier 
Tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-16-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Add a fwnode_handle allocator

2015-10-13T17:01:24+00:00

In order to be able to reference an irqdomain from ACPI, we need
to be able to create an identifier, which is usually a struct
device_node.

This device node does't really fit the ACPI infrastructure, so
we cunningly allocate a new structure containing a fwnode_handle,
and return that.

This structure doesn't really point to a device (interrupt
controllers are not "real" devices in Linux), but as we cannot
really deny that they exist, we create them with a new fwnode_type
(FWNODE_IRQCHIP).

Signed-off-by: Marc Zyngier 
Acked-by: Rafael J. Wysocki 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-9-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Introduce irq_domain_create_{linear, tree}

2015-10-13T17:01:24+00:00

Just like we have irq_domain_add_{linear,tree} to create a irq domain
identified by an of_node, introduce irq_domain_create_{linear,tree}
that do the same thing, except that they take a struct fwnode_handle.

Existing functions get rewritten in terms of the new ones so that
everything keeps working as before (and __irq_domain_add is now
fwnode_handle based as well).

Signed-off-by: Marc Zyngier 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-8-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Introduce irq_create_fwspec_mapping

2015-10-13T17:01:24+00:00

Just like we have irq_create_of_mapping, irq_create_fwspec_mapping
creates a IRQ domain mapping for an interrupt described in a
struct irq_fwspec.

irq_create_of_mapping gets rewritten in terms of the new function,
and the hack we introduced before gets removed (now that no stacked
irqchip uses of_phandle_args anymore).

Signed-off-by: Marc Zyngier 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-7-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Introduce a firmware-specific IRQ specifier structure

2015-10-13T17:01:23+00:00

So far the closest thing to a generic IRQ specifier structure is
of_phandle_args, which happens to be pretty OF specific (the of_node
pointer in there is quite annoying).

Let's introduce 'struct irq_fwspec' that can be used in place of
of_phandle_args for OF, but also for other firmware implementations
(that'd be ACPI). This is used together with a new 'translate' method
that is the pendent of 'xlate'.

We convert irq_create_of_mapping to use this new structure (with a
small hack that will be removed later).

Signed-off-by: Marc Zyngier 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-5-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Allow irq domain lookup by fwnode

2015-10-13T17:01:23+00:00

So far, our irq domains are still looked up by device node.
Let's change this and allow a domain to be looked up using
a fwnode_handle pointer.

The existing interfaces are preserved with a couple of helpers.

Signed-off-by: Marc Zyngier 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-4-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Convert irqdomain-%3Eof_node to fwnode

2015-10-13T17:01:23+00:00

Now that we have everyone accessing the of_node field via the
irq_domain_get_of_node accessor, it is pretty easy to swap it
for a pointer to a fwnode_handle.

This translates into a few limited changes in __irq_domain_add,
and an updated irq_domain_get_of_node.

Signed-off-by: Marc Zyngier 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-3-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner

irqdomain: Use irq_domain_get_of_node() instead of direct field access

2015-10-13T17:01:23+00:00

The struct irq_domain contains a "struct device_node *" field
(of_node) that is almost the only link between the irqdomain
and the device tree infrastructure.

In order to prepare for the removal of that field, convert all
users to use irq_domain_get_of_node() instead.

Signed-off-by: Marc Zyngier 
Reviewed-and-tested-by: Hanjun Guo 
Tested-by: Lorenzo Pieralisi 
Cc: 
Cc: Tomasz Nowicki 
Cc: Suravee Suthikulpanit 
Cc: Graeme Gregory 
Cc: Jake Oshins 
Cc: Jiang Liu 
Cc: Jason Cooper 
Cc: Rafael J. Wysocki 
Link: http://lkml.kernel.org/r/1444737105-31573-2-git-send-email-marc.zyngier@arm.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

genirq/irqdomain: Allow irq domain aliasing

2015-07-29T22:14:36+00:00

It is not uncommon (at least with the ARM stuff) to have a piece
of hardware that implements different flavours of "interrupts".
A typical example of this is the GICv3 ITS, which implements
standard PCI/MSI support, but also some form of "generic MSI".

So far, the PCI/MSI domain is registered using the ITS device_node,
so that irq_find_host can return it. On the contrary, the raw MSI
domain is not registered with an device_node, making it impossible
to be looked up by another subsystem (obviously, using the same
device_node twice would only result in confusion, as it is not
defined which one irq_find_host would return).

A solution to this is to "type" domains that may be aliasing, and
to be able to lookup an device_node that matches a given type.
For this, we introduce irq_find_matching_host() as a superset
of irq_find_host:

struct irq_domain *irq_find_matching_host(struct device_node *node,
                                enum irq_domain_bus_token bus_token);

where bus_token is the "type" we want to match the domain against
(so far, only DOMAIN_BUS_ANY is defined). This result in some
moderately invasive changes on the PPC side (which is the only
user of the .match method).

This has otherwise no functionnal change.

Reviewed-by: Hanjun Guo 
Signed-off-by: Marc Zyngier 
Cc: 
Cc: Yijing Wang 
Cc: Ma Jun 
Cc: Lorenzo Pieralisi 
Cc: Duc Dang 
Cc: Bjorn Helgaas 
Cc: Jiang Liu 
Cc: Jason Cooper 
Link: http://lkml.kernel.org/r/1438091186-10244-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner