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genirq: Add generic msi irq domain support

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Implement the basic functions for MSI interrupt support with
hierarchical interrupt domains.

[ tglx: Extracted and combined from several patches ]

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu
2014-11-12 11:39:03 +01:00
committed by Thomas Gleixner
parent 9dde55b72d
commit f3cf8bb0d6
4 changed files with 197 additions and 0 deletions
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45
include/linux/msi.h
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@@ -114,4 +114,49 @@ struct msi_controller {
void (*teardown_irq)(struct msi_controller *chip, unsigned int irq);
};
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
struct irq_domain;
struct irq_chip;
struct device_node;
struct msi_domain_info;
/**
* struct msi_domain_ops - MSI interrupt domain callbacks
* @get_hwirq: Retrieve the resulting hw irq number
* @msi_init: Domain specific init function for MSI interrupts
* @msi_free: Domain specific function to free a MSI interrupts
*/
struct msi_domain_ops {
irq_hw_number_t (*get_hwirq)(struct msi_domain_info *info, void *arg);
int (*msi_init)(struct irq_domain *domain,
struct msi_domain_info *info,
unsigned int virq, irq_hw_number_t hwirq,
void *arg);
void (*msi_free)(struct irq_domain *domain,
struct msi_domain_info *info,
unsigned int virq);
};
/**
* struct msi_domain_info - MSI interrupt domain data
* @ops: The callback data structure
* @chip: The associated interrupt chip
* @data: Domain specific data
*/
struct msi_domain_info {
struct msi_domain_ops *ops;
struct irq_chip *chip;
void *data;
};
int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
bool force);
struct irq_domain *msi_create_irq_domain(struct device_node *of_node,
struct msi_domain_info *info,
struct irq_domain *parent);
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#endif /* LINUX_MSI_H */