Re: [PATCH v4 0/7] irqchip/ACPI: Arm GICv5 IWB ACPI IRQ probe deferral

On Thu, Jul 9, 2026 at 10:41 AM Lorenzo Pieralisi <[email protected]> wrote:
>
> On Arm GICv5 systems, the IWB (Interrupt Wire Bridge) handles wired interrupts
> and it is in charge of translating interrupt wires to GICv5 ITS messages.
>
> In ACPI systems, an IWB is backed by a platform device. Device drivers for
> devices whose IRQs are routed to an IWB might probe earlier than the IWB device
> driver, which can result in failures in that until the IWB driver is probed and
> its IRQ domain is duly registered, IRQs routed to it cannot be resolved.
>
> Some interrupt controllers for the RISC-V architecture suffer from the same
> issue; RISC-V, in its ACPI IRQ layer solved the problem by automatically
> creating device dependencies that result in the interrupt controllers drivers
> being probed before any device driver whose devices IRQs are routed to them is
> probed.
>
> Instead of reinventing the wheel, this series move the aforementioned RISC-V
> code to generic ACPI IRQ handling code (while fixing some bits and pieces) and
> implement GICv5 IWB ACPI probe deferral on top of it.
>
> Signed-off-by: Lorenzo Pieralisi <[email protected]>
> ---
> Changes in v4:
> - Applied v3 review comments and tags
> - Link to v3: https://patch.msgid.link/20260701-gic-v5-acpi-iwb-probe-deferral-v3-0-c5562cf0fe29@kernel.org
>
> Changes in v3:
> - Added stub to clear ACPI device dependencies
> - Added review tags
> - Rebased against v7.2-rc1
> - Link to v2: https://patch.msgid.link/20260603-gic-v5-acpi-iwb-probe-deferral-v2-0-23ffa16b6ebb@kernel.org
>
> Changes in v2:
> - Split the patchset in several logic units according to review
> - Link to v1: https://patch.msgid.link/20260505-gic-v5-acpi-iwb-probe-deferral-v1-0-b37b85998362@kernel.org
>
> To: "Rafael J. Wysocki" <[email protected]>
> To: Len Brown <[email protected]>
> To: Sunil V L <[email protected]>
> To: Marc Zyngier <[email protected]>
> To: Thomas Gleixner <[email protected]>
> To: Lorenzo Pieralisi <[email protected]>
> To: Huacai Chen <[email protected]>
> To: Anup Patel <[email protected]>
> To: Hanjun Guo <[email protected]>
> To: Sudeep Holla <[email protected]>
> To: Catalin Marinas <[email protected]>
> To: Will Deacon <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: "Rafael J. Wysocki" <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
>
> ---
> Lorenzo Pieralisi (7):
>       ACPI: Add acpi_device_clear_deps() helper function
>       ACPI: RISC-V: Fix riscv_acpi_irq_get_dep() loop termination
>       ACPI: RISC-V: Check acpi_get_handle() status in riscv_acpi_add_prt_dep()
>       ACPI: RISC-V: Fix riscv_acpi_add_prt_dep() loop handling
>       ACPI: irq: Move RISC-V interrupt controllers autodep to ACPI IRQ code
>       ACPI/IORT: Implement ACPI infrastructure to enable GICv5 IWB probe deferral
>       irqchip/gic-v5: Enable GICv5 IWB ACPI probe ordering detection
>
>  arch/riscv/include/asm/acpi.h       |   1 +
>  drivers/acpi/arm64/iort.c           |  22 ++++-
>  drivers/acpi/irq.c                  | 172 +++++++++++++++++++++++++++++++++++-
>  drivers/acpi/riscv/irq.c            | 141 +----------------------------
>  drivers/acpi/scan.c                 |   1 +
>  drivers/irqchip/irq-gic-v3.c        |   2 +-
>  drivers/irqchip/irq-gic-v5-iwb.c    |   2 +
>  drivers/irqchip/irq-gic-v5.c        |  13 ++-
>  drivers/irqchip/irq-gic.c           |   2 +-
>  drivers/irqchip/irq-loongarch-cpu.c |   2 +-
>  drivers/irqchip/irq-riscv-intc.c    |   3 +-
>  include/linux/acpi.h                |  13 ++-
>  include/linux/acpi_iort.h           |   3 +-
>  13 files changed, 223 insertions(+), 154 deletions(-)
> ---

All applied as 7.3 material, thanks!