diff options
| author | Sunil V L <sunilvl@ventanamicro.com> | 2024-08-12 06:29:14 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-08-27 15:48:35 +0200 |
| commit | a9b8f337ea4eb66e4980f90bb73e8786e56cacfd (patch) | |
| tree | ecbcdfab862c7a5cc3ce001cbc09a0649ca34168 | |
| parent | 789befdfa3892957d36d20e6e90be05486e316c5 (diff) | |
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>
| -rw-r--r-- | drivers/acpi/scan.c | 3 | ||||
| -rw-r--r-- | include/linux/acpi.h | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 22ae7829a915..607bbb8b90da 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -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; diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 0687a442fec7..3fff86f95c2f 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -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 \ |