genirq: Add irq_chip_(startup/shutdown)_parent()

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[ Upstream commit 7a721a2fee ]

As the MSI controller on SG2044 uses PLIC as the underlying interrupt
controller, it needs to call irq_enable() and irq_disable() to
startup/shutdown interrupts. Otherwise, the MSI interrupt can not be
startup correctly and will not respond any incoming interrupt.

Introduce irq_chip_startup_parent() and irq_chip_shutdown_parent() to allow
the interrupt controller to call the irq_startup()/irq_shutdown() callbacks
of the parent interrupt chip.

In case the irq_startup()/irq_shutdown() callbacks are not implemented for
the parent interrupt chip, this will fallback to irq_chip_enable_parent()
or irq_chip_disable_parent().

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Chen Wang <unicorn_wang@outlook.com> # Pioneerbox
Reviewed-by: Chen Wang <unicorn_wang@outlook.com>
Link: https://lore.kernel.org/all/20250813232835.43458-2-inochiama@gmail.com
Link: https://lore.kernel.org/lkml/20250722224513.22125-1-inochiama@gmail.com/
Stable-dep-of: 9d8c41816b ("irqchip/sg2042-msi: Fix broken affinity setting")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Inochi Amaoto 2025-08-14 07:28:31 +08:00 • committed by Greg Kroah-Hartman

parent d760948a0f

commit 23b79aad16

2 changed files with 39 additions and 0 deletions

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include/linux/irq.h

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37

kernel/irq/chip.c

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