blackbird-op-linux/include/linux/irqdomain.h, branch v4.5

irqdomain: Allow domain lookup with DOMAIN_BUS_WIRED token

2016-01-26T15:00:14+00:00

Let's take the (outlandish) example of an interrupt controller capable of handling both wired interrupts and PCI MSIs. With the current code, the PCI MSI domain is going to be tagged with DOMAIN_BUS_PCI_MSI, and the wired domain with DOMAIN_BUS_ANY. Things get hairy when we start looking up the domain for a wired interrupt (typically when creating it based on some firmware information - DT or ACPI). In irq_create_fwspec_mapping(), we perform the lookup using DOMAIN_BUS_ANY, which is actually used as a wildcard. This gives us one chance out of two to end up with the wrong domain, and we try to configure a wired interrupt with the MSI domain. Everything grinds to a halt pretty quickly. What we really need to do is to start looking for a domain that would uniquely identify a wired interrupt domain, and only use DOMAIN_BUS_ANY as a fallback. In order to solve this, let's introduce a new DOMAIN_BUS_WIRED token, which is going to be used exactly as described above. Of course, this depends on the irqchip to setup the domain bus_token, and nobody had to implement this so far. Only so far. Signed-off-by: Marc Zyngier Cc: Greg Kroah-Hartman Cc: Rob Herring Cc: Frank Rowand Cc: Grant Likely Cc: Thomas Petazzoni Cc: Jiang Liu Link: http://lkml.kernel.org/r/1453816347-32720-2-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner

Merge branch 'irq/gic-v2m-acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core

2015-12-29T09:08:45+00:00

Pull another round of GIC changes from Marc: ACPI support for GIV-v2m

irqdomain: Introduce is_fwnode_irqchip helper

2015-12-21T13:49:49+00:00

Since there will be several places checking if fwnode.type is equal FWNODE_IRQCHIP, this patch adds a convenient function for this purpose. Acked-by: Marc Zyngier Signed-off-by: Suravee Suthikulpanit Signed-off-by: Marc Zyngier

acpi: pci: Setup MSI domain for ACPI based pci devices

2015-12-21T13:49:32+00:00

This patch introduces pci_msi_register_fwnode_provider() for irqchip to register a callback, to provide a way to determine appropriate MSI domain for a pci device. It also introduces pci_host_bridge_acpi_msi_domain(), which returns the MSI domain of the specified PCI host bridge with DOMAIN_BUS_PCI_MSI bus token. Then, it is assigned to pci device. Reviewed-by: Marc Zyngier Acked-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki Signed-off-by: Suravee Suthikulpanit Signed-off-by: Marc Zyngier

irqdomain: Make irq_domain_alloc_irqs_recursive available

2015-12-16T15:29:44+00:00

We are soon going to need the MSI layer to call into the domain allocators. Instead of open coding this, make the standard irq_domain_alloc_irqs_recursive function available to the MSI layer. Signed-off-by: Marc Zyngier

irqdomain: Documentation updates

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

Update the IRQ domain documentation to reflect the changes made while divorcing the domain infrastructure from Device Tree. 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/1444737105-31573-18-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner

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