Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 515085ef authored by Jiang Liu's avatar Jiang Liu Committed by Thomas Gleixner
Browse files

genirq: Introduce irq_chip.irq_compose_msi_msg() to support stacked irqchip 



Add callback irq_compose_msi_msg to struct irq_chip, which will be used
to support stacked irqchip.

Signed-off-by: default avatarJiang 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: default avatarThomas Gleixner <tglx@linutronix.de>
parent 56e8abab

include/linux/irq.h

+5 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ struct seq_file; 
struct module;

struct irq_desc;

struct irq_data;

struct msi_msg;

typedef	void (*irq_flow_handler_t)(unsigned int irq,

					    struct irq_desc *desc);

typedef	void (*irq_preflow_handler_t)(struct irq_data *data);
@@ -320,6 +321,7 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d) 
 *				any other callback related to this irq

 * @irq_release_resources:	optional to release resources acquired with

 *				irq_request_resources

 * @irq_compose_msi_msg:	optional to compose message content for MSI

 * @flags:		chip specific flags

 */

struct irq_chip {
@@ -356,6 +358,8 @@ struct irq_chip { 
	int		(*irq_request_resources)(struct irq_data *data);

	void		(*irq_release_resources)(struct irq_data *data);



	void		(*irq_compose_msi_msg)(struct irq_data *data, struct msi_msg *msg);



	unsigned long	flags;

};
@@ -443,6 +447,7 @@ extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc); 
extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_nested_irq(unsigned int irq);



extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg);

#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

extern void irq_chip_ack_parent(struct irq_data *data);

extern int irq_chip_retrigger_hierarchy(struct irq_data *data);

kernel/irq/chip.c

+26 −0
Original line number Diff line number Diff line
@@ -926,3 +926,29 @@ int irq_chip_retrigger_hierarchy(struct irq_data *data) 
	return -ENOSYS;

}

#endif



/**

 * irq_chip_compose_msi_msg - Componse msi message for a irq chip

 * @data:	Pointer to interrupt specific data

 * @msg:	Pointer to the MSI message

 *

 * For hierarchical domains we find the first chip in the hierarchy

 * which implements the irq_compose_msi_msg callback. For non

 * hierarchical we use the top level chip.

 */

int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)

{

	struct irq_data *pos = NULL;



#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

	for (; data; data = data->parent_data)

#endif

		if (data->chip && data->chip->irq_compose_msi_msg)

			pos = data;

	if (!pos)

		return -ENOSYS;



	pos->chip->irq_compose_msi_msg(pos, msg);



	return 0;

}