[PATCH 0/5] Add M-mode System MSI interrupt controller

[Nick Hu]

This series adds an irqchip driver for the RPMI System MSI service group.
Platforms can then route system MSIs from the platform microcontroller to
the M-mode IMSIC, where the generic sbi_irqchip framework handles them.

Open Question for Devicetree Binding:
I am unsure if reusing the riscv,rpmi-system-msi compatible string for the
M-mode System MSI interrupt controller is the right approach. The Linux
binding[1] explicitly states it is "intended for use by the supervisor software."
We could either define a new M-mode-specific binding, or reuse the existing one
and update the Linux binding. Feedback on this is welcome.

[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/interrupt-controller/riscv%2Crpmi-system-msi.yaml

Signed-off-by: Nick Hu <nick.hu at sifive.com>
---
Nick Hu (5):
      lib: utils/irqchip: Add RPMI system MSI helper library
      lib: utils/mailbox: Unlink mailbox channel before freeing it
      lib: utils/mailbox: Reference count mailbox channels
      lib: utils/irqchip/imsic: Fail MSI programming on compose error
      lib: utils/irqchip: Add RPMI system MSI driver

 include/sbi/sbi_irqchip.h                   |   1 +
 include/sbi_utils/irqchip/rpmi_sysmsi.h     |  25 ++
 include/sbi_utils/mailbox/mailbox.h         |   5 +
 lib/utils/irqchip/Kconfig                   |  11 +
 lib/utils/irqchip/fdt_irqchip_rpmi_sysmsi.c | 119 +++++++++
 lib/utils/irqchip/imsic.c                   |   3 +-
 lib/utils/irqchip/objects.mk                |   4 +
 lib/utils/irqchip/rpmi_sysmsi.c             | 380 ++++++++++++++++++++++++++++
 lib/utils/mailbox/mailbox.c                 |  14 +-
 lib/utils/mpxy/Kconfig                      |   2 +
 lib/utils/mpxy/fdt_mpxy_rpmi_sysmsi.c       |  61 +----
 platform/generic/configs/defconfig          |   1 +
 12 files changed, 567 insertions(+), 59 deletions(-)
---
base-commit: 6ad246a1494807ee91e36ffcf60e4c30bb309d45
change-id: 20261101-dev-nickh-msysmsi-dev-upstream-8d992a7c7e5f

Best regards,
--  
Nick Hu <nick.hu at sifive.com>