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The RPMI specification defines a system MSI service group which allows application processors to receive MSIs upon system events such as graceful shutdown/reboot request, CPU hotplug event, memory hotplug event, etc. Add an irqchip driver for the RISC-V RPMI system MSI service group to directly receive system MSIs in Linux kernel. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Link: https://lore.kernel.org/r/20250818040920.272664-14-apatel@ventanamicro.com Signed-off-by: Paul Walmsley <pjw@kernel.org>