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

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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/acpi/scan.c
View File

@ -2757,6 +2757,8 @@ static int __init acpi_match_madt(union acpi_subtable_headers *header,
return 0;
}
void __weak arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) { }
int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
{
int count = 0;
@ -2765,6 +2767,7 @@ int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
return 0;
mutex_lock(&acpi_probe_mutex);
arch_sort_irqchip_probe(ap_head, nr);
for (ape = ap_head; nr; ape++, nr--) {
if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
acpi_probe_count = 0;

2
include/linux/acpi.h
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 \