[v6,00/10] RISC-V IMSIC driver improvements

Message

Anup Patel Feb. 17, 2025, 8:56 a.m. UTC

This series is based on recent discussion on LKML:
https://lore.kernel.org/lkml/[e-mail]/

It primarily focuses on moving to RISC-V IMSIC driver use common MSI
lib and GENERIC_PENDING_IRQ.

PATCH1 & PATCH2: Preparatory patches
PATCH3: Updates IMSIC driver to use MSI lib
PATCH4 to PATCH5: Preparatory patches for moving to GENERIC_PENDING_IRQ
PATCH6 to PATCH10: Patches to use GENERIC_PENDING_IRQ in IMSIC driver

These patches can also be found in the riscv_imsic_imp_v6 branch at:
https://github.com/avpatel/linux.git

Changes since v5:
 - Rebased upon Linux-6.14-rc1
 - Drop PATCH6 since it is already merged
 - Update commit description of PATCH1

Changes since v4:
 - Updated PATCH4 with better irq_force_complete_move() implementation
   provided by Thomas.

Changes since v3:
 - Dropped PATCH1 of v3 series and updated last patch of this series
   to handle the intermediate state for non-atomic MSI update.
 - Added new PATCH6 in this series to remove stale kconfig option
   GENERIC_PENDING_IRQ_CHIPFLAGS.

Changes since v2:
 - Rebased upon Linux-6.14-rc1
 - Dropped PATCH5 of v2 series since that patch is already merged

Changes since v1:
 - Changed series subject
 - Expand this series to use GENERIC_PENDING_IRQ in IMSIC driver

Andrew Jones (1):
  irqchip/riscv-imsic: Set irq_set_affinity for IMSIC base

Anup Patel (6):
  genirq: Introduce irq_can_move_in_process_context()
  RISC-V: Select GENERIC_PENDING_IRQ
  irqchip/riscv-imsic: Separate next and previous pointers in IMSIC
    vector
  irqchip/riscv-imsic: Implement irq_force_complete_move() for IMSIC
  irqchip/riscv-imsic: Replace hwirq with irq in the IMSIC vector
  irqchip/riscv-imsic: Special handling for non-atomic device MSI update

Thomas Gleixner (3):
  irqchip/irq-msi-lib: Optionally set default irq_eoi/irq_ack
  irqchip/riscv-imsic: Move to common MSI lib
  genirq: Introduce common irq_force_complete_move() implementation

 arch/riscv/Kconfig                         |   1 +
 arch/x86/kernel/apic/vector.c              | 231 ++++++++++-----------
 drivers/irqchip/Kconfig                    |   8 +-
 drivers/irqchip/irq-gic-v2m.c              |   1 +
 drivers/irqchip/irq-imx-mu-msi.c           |   1 +
 drivers/irqchip/irq-msi-lib.c              |  11 +-
 drivers/irqchip/irq-mvebu-gicp.c           |   1 +
 drivers/irqchip/irq-mvebu-odmi.c           |   1 +
 drivers/irqchip/irq-mvebu-sei.c            |   1 +
 drivers/irqchip/irq-riscv-imsic-early.c    |  14 +-
 drivers/irqchip/irq-riscv-imsic-platform.c | 197 +++++++++---------
 drivers/irqchip/irq-riscv-imsic-state.c    | 152 ++++++++++----
 drivers/irqchip/irq-riscv-imsic-state.h    |  12 +-
 include/linux/irq.h                        |   7 +-
 include/linux/msi.h                        |  11 +
 kernel/irq/internals.h                     |   2 +
 kernel/irq/migration.c                     |  21 ++
 17 files changed, 389 insertions(+), 283 deletions(-)