[PATCH dovetail v8 00/11] riscv: Add dovetail support

Hi all,

this series introduces initial support for Dovetail on RISC-V.

Feedback, suggestions, and especially reviews are very welcome.

Changes since v1:
 * Disable independent irq/softirq stack usage when pipelining
 * Drop KVM changes as long as they can not be properly tested

Changes since v2:
 * Rework trap handling

Changes since v3:
 * Included the IRQ pipelining patches to have all riscv specific
   patches included
 * Rebased to dovetail/v6.18.y-dovetail-rebase
 * Merged most of the fixes
 * Fixed IRQ Stack handling and enabled IRQ_STACKS again

Changes since v4:
 * Rebased to dovetail/v7.0.y-dovetail-rebase
 * Applied suggestions from the last patch set
 * Added starfive-visionfive2 board support
 * Introduced raw console device based on sbi debug console
 * Reworked pipelined irq handling

Changes since v5:
 * Rebased to tip of dovetail/v7.0.y-dovetail-rebase
 * Applied suggestions from the last patch set
 * Use mark_trap_entry/exit_raw for kernel mode exception paths which
   use irq_nmi_entry/exit for now, as the nmi irq handlers expect hard
   irqs to stay off. This may be be subject to further optimization at
   a later stage, but I do not see any negative impact latency wise in
   my tests.

Changes since v6:
Address the review comments from the last patch set:
 * Keep the virtual irq state in sync with the hard irq state in trap
   handlers
 * Fix irq_nesting imbalance when running with disabled IRQ_STACKS

Changes since v7:
 * Simplify Trap handling
 * Rebase to wip/flo/v7.1-dovetail-rebase

Best,
Tobias

Tobias Schaffner (11):
  riscv: introduce raw console device
  riscv: irq_pipeline: add IRQ pipelining core
  irqchip/riscv-aplic-direct: enable pipelined interrupt control
  irqchip/irq-riscv-aplic-msi: enable pipelined interrupt control
  irqchip/irq-riscv-imsic-platform: enable pipelined interrupt control
  irqchip/irq-riscv-intc: enable pipelined interrupt control
  irqchip/irq-sifive-plic: enable pipelined interrupt control
  clocksource/timer-riscv: irq_pipeline: enable pipelined clock events
  pinctrl: starfive: irq_pipeline: enable pipelined interrupt control
  PCI: plda: irq_pipeline: enable pipelined interrupt control
  riscv: dovetail: add core support

 arch/riscv/Kconfig                            |   3 +
 arch/riscv/include/asm/dovetail.h             |  24 +++
 arch/riscv/include/asm/irq_pipeline.h         | 143 +++++++++++++++
 arch/riscv/include/asm/irqflags.h             |  32 ++--
 arch/riscv/include/asm/mmu_context.h          |   2 +
 arch/riscv/include/asm/smp.h                  |  25 +++
 arch/riscv/include/asm/syscall.h              |   6 +
 arch/riscv/include/asm/thread_info.h          |  17 ++
 arch/riscv/kernel/Makefile                    |   2 +
 arch/riscv/kernel/irq_pipeline.c              |  26 +++
 arch/riscv/kernel/kernel_mode_vector.c        |   2 +-
 arch/riscv/kernel/raw_printk.c                |  33 ++++
 arch/riscv/kernel/sbi-ipi.c                   |  12 +-
 arch/riscv/kernel/smp.c                       |  56 ++++--
 arch/riscv/kernel/smpboot.c                   |   6 +-
 arch/riscv/kernel/traps.c                     | 169 +++++++++++++++++-
 arch/riscv/mm/context.c                       |  20 ++-
 arch/riscv/mm/fault.c                         |  29 +--
 drivers/clocksource/timer-riscv.c             |  11 +-
 drivers/irqchip/irq-riscv-aplic-direct.c      |   3 +-
 drivers/irqchip/irq-riscv-aplic-msi.c         |   3 +-
 drivers/irqchip/irq-riscv-imsic-platform.c    |   4 +-
 drivers/irqchip/irq-riscv-intc.c              |   2 +
 drivers/irqchip/irq-sifive-plic.c             |  10 +-
 drivers/pci/controller/plda/pcie-plda-host.c  |   2 +
 .../starfive/pinctrl-starfive-jh7110.c        |   2 +-
 .../starfive/pinctrl-starfive-jh7110.h        |   2 +-
 27 files changed, 578 insertions(+), 68 deletions(-)
 create mode 100644 arch/riscv/include/asm/dovetail.h
 create mode 100644 arch/riscv/include/asm/irq_pipeline.h
 create mode 100644 arch/riscv/kernel/irq_pipeline.c
 create mode 100644 arch/riscv/kernel/raw_printk.c

-- 
2.43.0