From mboxrd@z Thu Jan 1 00:00:00 1970 From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni) Date: Wed, 7 Aug 2013 11:32:27 +0200 Subject: [PATCHv7 06/13] irqdomain: add support to associate an irq_domain with a msi_chip In-Reply-To: <1375867954-2320-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1375867954-2320-1-git-send-email-thomas.petazzoni@free-electrons.com> Message-ID: <1375867954-2320-7-git-send-email-thomas.petazzoni@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Message Signaled Interrupts are a PCI-specific mechanism that allows PCI devices to notify interrupts to the CPU using in-band messages. The PCI subsystem represents an MSI-capable interrupt controller as an msi_chip structure, and this patch improves the irqdomain subsystem with a new pointer associating an irq_domain with the corresponding msi_chip. The irq_domain structure gains a pointer to a msi_chip structure, and a new helper function irq_domain_add_msi() is added to help in allocating, initializing and registering an irq_domain for a MSI-type interrupt controller. Signed-off-by: Thomas Petazzoni Tested-by: Daniel Price --- include/linux/irqdomain.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 7113941..b0504ff 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -38,6 +38,7 @@ struct device_node; struct irq_domain; struct of_device_id; +struct msi_chip; /* Number of irqs reserved for a legacy isa controller */ #define NUM_ISA_INTERRUPTS 16 @@ -101,6 +102,7 @@ struct irq_domain { /* Optional data */ struct device_node *of_node; struct irq_domain_chip_generic *gc; + struct msi_chip *msi_chip; /* reverse map data. The linear map gets appended to the irq_domain */ irq_hw_number_t hwirq_max; @@ -177,6 +179,22 @@ static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node __irq_domain_register(d); return d; } +static inline struct irq_domain *irq_domain_add_msi(struct device_node *of_node, + unsigned int size, + const struct irq_domain_ops *ops, + struct msi_chip *msi_chip, + void *host_data) +{ + struct irq_domain *d; + d = __irq_domain_alloc(of_node, size, size, 0, ops, host_data); + if (d) { + d->msi_chip = msi_chip; + __irq_domain_register(d); + } + + return d; +} + extern void irq_domain_remove(struct irq_domain *host); -- 1.8.1.2