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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>
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@ -2757,6 +2757,8 @@ static int __init acpi_match_madt(union acpi_subtable_headers *header,
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return 0;
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}
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void __weak arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) { }
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int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
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{
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int count = 0;
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@ -2765,6 +2767,7 @@ int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
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return 0;
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mutex_lock(&acpi_probe_mutex);
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arch_sort_irqchip_probe(ap_head, nr);
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for (ape = ap_head; nr; ape++, nr--) {
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if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
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acpi_probe_count = 0;
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@ -1343,6 +1343,8 @@ struct acpi_probe_entry {
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kernel_ulong_t driver_data;
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};
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void arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr);
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#define ACPI_DECLARE_PROBE_ENTRY(table, name, table_id, subtable, \
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valid, data, fn) \
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static const struct acpi_probe_entry __acpi_probe_##name \
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