irqchip: Provide irq-msi-lib

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All irqdomains which provide MSI parent domain functionality for per device
MSI domains need to provide a select() callback for the irqdomain and a
function to initialize the child domain.

Most of these functions would just be copy&paste with minimal
modifications, so provide a library function which implements the required
functionality and is customizable via parent_domain::msi_parent_ops. The
check for the supported bus tokens in msi_lib_init_dev_msi_info() is
expanded step by step within the next patches.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240623142234.840975799@linutronix.de

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Thomas Gleixner 2024-06-23 17:18:34 +02:00

parent 7d189c7710

commit 72e257c6f0

4 changed files with 135 additions and 0 deletions

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3

drivers/irqchip/Kconfig

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1

drivers/irqchip/Makefile

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112

drivers/irqchip/irq-msi-lib.c

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19

drivers/irqchip/irq-msi-lib.h

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