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 match the GIC version and GIC driver and load it.
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.
The stacked irq domain will be:
acpi_irq_domain == gicv2 or gicv3 core domain ^ | (parent) | ITS domain or GIv2m domain ^ | | MSI chip irq domain
Since there is one GICD supported for now, so there will be only one irqdomain created when GICv2/3 initialized, for all the wired hardware irqs for PPI, SGI and SPI, they will have unique hardware irq number (GSI), so we can match the device to the acpi_irq_domain with unique GSI and it will work. If there will be multi GICD in the future, this will still works to follow the solution for x86 of ACPI (mutil IOAPICs).
Note: patch 1~2 already merged in ACPICA core, I just send them out for helping of better understanding later 7 patches.
Any comments are warmly welcomed.
update from RFC version: - Consolidate all the GIC init code into drivers/irqchip/irq-gic-acpi.c
v1->v2: - Remove the gicv2/v3 related driver code in drivers/irqchip/irq-gic-acpi.c which I was trying to consolidate them in one file, then arm-gic.h and arm-gic-v3.h will be used separately within parent driver only
- Drop the gsi_mutex patch
- Use the GIC version to match the GIC driver, then no need to test for the version in each driver
- Move acpi_irq_init() to drivers/irqchip/irq-gic-acpi.c instead of in drivers/acpi/irq.c. maybe we need to rename acpi_irq_init() as acpi_gic_init() but I keep that name to accommodate of_irq_init(), any objections please let me know.
Bob Moore (1): ACPICA: ACPI 6.0: Add changes for MADT table.
Hanjun Guo (6): ACPICA: ACPI 6.0: Add values for MADT GIC version field. irqchip / GIC: Add GIC version support in ACPI MADT ACPI / irqchip: Add self-probe infrastructure to initialize IRQ controller irqchip / GIC / ACPI: Use IRQCHIP_ACPI_DECLARE to simplify GICv2 init code irqchip / gic: Add stacked irqdomain support for ACPI based GICv2 init irqchip / GICv3: Add stacked irqdomain support for ACPI based init
Tomasz Nowicki (2): irqchip / GICv3: Refactor gic_of_init() for GICv3 driver irqchip / GICv3: Add ACPI support for GICv3+ initialization
arch/arm64/Kconfig | 1 + arch/arm64/include/asm/acpi.h | 1 - arch/arm64/include/asm/irq.h | 13 -- arch/arm64/kernel/acpi.c | 25 ---- drivers/acpi/gsi.c | 28 ++-- drivers/irqchip/Kconfig | 3 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-gic-acpi.c | 141 +++++++++++++++++++ drivers/irqchip/irq-gic-v3.c | 264 ++++++++++++++++++++++++++++------- drivers/irqchip/irq-gic.c | 35 ++--- drivers/irqchip/irqchip.h | 12 ++ include/acpi/actbl1.h | 33 ++++- include/asm-generic/vmlinux.lds.h | 13 ++ include/linux/acpi.h | 16 +++ include/linux/acpi_irq.h | 4 +- include/linux/irqchip/arm-gic-acpi.h | 10 +- include/linux/mod_devicetable.h | 8 ++ 17 files changed, 473 insertions(+), 135 deletions(-) create mode 100644 drivers/irqchip/irq-gic-acpi.c