This patch set introduce self-probe infrastructure to init IRQ controllers and stacked irqdomain support for ACPI based GICv2/3 init.
The self-probe infrastructure for ACPI GIC init is similar as IRQCHIP_DECLARE() and based on the GIC version support in ACPI MADT table.
We introduce acpi_irq_domain for GICv2/3 core domain to support stacked irqdomain, and pass the gsi (global system interrupt) as the agument (void *arg) for gic_irq_domain_alloc(), then we can alloc virqs via acpi_register_gsi() with stacked irqdomain.
I already compiled this patch set ok with both ACPI=on/off on ARM64 and also compiled ok on x86, tested with GICv2 init on FVP model and it boot successfully.
Next step I would consolidate all the ACPI GIC init into one file -- drivers/irqchip/irq-gic-acpi.c, and introduce ITS and IORT support.
please comment on this patchset to see if we are on the right direction.
Hanjun Guo (6): irqchip / gic: Add GIC version support in ACPI MADT irqchip: gic: ACPI: Use IRQCHIP_ACPI_DECLARE to simplify GICv2 init code irqchip / gic: Add stacked irqdomain support for ACPI based GICv2 init ACPI / gsi: Add gsi_mutex to synchronize acpi_register_gsi()/acpi_unregister_gsi() irqchip / GICv3: Add ACPI support for GICv3+ initialization irqchip / GICv3: Add stacked irqdomain support for ACPI based init
Tomasz Nowicki (3): ACPICA: Introduce GIC version for arm based system ACPI / irqchip: Add self-probe infrastructure to initialize IRQ controller irqchip / GICv3: Refactor gic_of_init() for GICv3 driver
arch/arm64/Kconfig | 1 + arch/arm64/include/asm/irq.h | 13 -- arch/arm64/kernel/acpi.c | 25 ---- drivers/acpi/Makefile | 1 + drivers/acpi/gsi.c | 39 ++--- drivers/acpi/irq.c | 40 ++++++ drivers/irqchip/Kconfig | 3 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-gic-acpi.c | 116 +++++++++++++++ drivers/irqchip/irq-gic-v3.c | 267 ++++++++++++++++++++++++++++------- drivers/irqchip/irq-gic.c | 38 ++--- drivers/irqchip/irqchip.h | 12 ++ include/acpi/actbl1.h | 17 ++- include/asm-generic/vmlinux.lds.h | 13 ++ include/linux/acpi.h | 14 ++ include/linux/acpi_irq.h | 4 +- include/linux/irqchip/arm-gic-acpi.h | 12 +- include/linux/mod_devicetable.h | 7 + 18 files changed, 489 insertions(+), 134 deletions(-) create mode 100644 drivers/acpi/irq.c create mode 100644 drivers/irqchip/irq-gic-acpi.c