ACPI: scan: Add a weak arch_sort_irqchip_probe() to order the IRQCHIP probe

Unlike OF framework, the irqchip probe using IRQCHIP_ACPI_DECLARE has no
order defined. Depending on the Makefile is not a good idea. So,
usually it is worked around by mandating only root interrupt controller
probed using IRQCHIP_ACPI_DECLARE and other interrupt controllers are
probed via cascade mechanism.

However, this is also not a clean solution because if there are multiple
root controllers (ex: RINTC in RISC-V which is per CPU) which need to be
probed first, then the cascade will happen for every root controller.
So, introduce an architecture specific weak function
arch_sort_irqchip_probe() to order the probing of the interrupt
controllers which can be implemented by different architectures as per
their interrupt controller hierarchy.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://patch.msgid.link/20240812005929.113499-3-sunilvl@ventanamicro.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

This commit is contained in:

Sunil V L

2024-08-12 06:29:14 +05:30

committed by

Rafael J. Wysocki

parent 789befdfa3

commit a9b8f337ea

2 changed files with 5 additions and 0 deletions

									
										include/linux/acpi.h
									
		+2
		
												View File
												
				@@ -1343,6 +1343,8 @@ struct acpi_probe_entry {

					kernel_ulong_t driver_data;

				};

				void arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr);

				#define ACPI_DECLARE_PROBE_ENTRY(table, name, table_id, subtable,	\

								 valid, data, fn)			\

					static const struct acpi_probe_entry __acpi_probe_##name	\