Messages in this thread | | | From | Anup Patel <> | Subject | [PATCH v3 0/4] New RISC-V Local Interrupt Controller Driver | Date | Wed, 19 Feb 2020 22:45:16 +0530 |
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This patchset provides a new RISC-V Local Interrupt Controller Driver for managing per-CPU local interrupts. The overall approach is inspired from the way per-CPU local interrupts are handled by Linux ARM64 and ARM GICv3 driver.
Few advantages of having this new driver are as follows: 1. It registers all local interrupts as per-CPU interrupts 2. We can develop drivers for devices with per-CPU local interrupts without changing arch code or this driver 3. It allows local interrupt controller DT node under each CPU DT node as well as single system-wide DT node for local interrupt controller.
With this patchset, output of "cat /proc/interrupts" looks as follows: CPU0 CPU1 CPU2 CPU3 2: 379 0 0 0 SiFive PLIC 10 ttyS0 3: 591 0 0 0 SiFive PLIC 8 virtio0 5: 5079 10821 8435 12984 RISC-V INTC 5 riscv-timer IPI0: 2045 2537 891 870 Rescheduling interrupts IPI1: 9 269 91 168 Function call interrupts IPI2: 0 0 0 0 CPU stop interrupts
The patchset is based up Linux-5.6-rc2 and can be found at riscv_intc_v3 branch of: https://github.com/avpatel/linux.git
Changes since v2: - Dropped PATCH2 since it was merged long-time back - Rebased series from Linux-4.19-rc2 to Linux-5.6-rc2
Changes since v1: - Removed changes related to puggable IPI triggering - Separate patch for self-contained IPI handling routine - Removed patch for GENERIC_IRQ kconfig options - Added patch to remove do_IRQ() function - Rebased upon Atish's SMP patches
Anup Patel (4): RISC-V: self-contained IPI handling routine irqchip: RISC-V Per-HART Local Interrupt Controller Driver clocksource: timer-riscv: Make timer interrupt as a per-CPU interrupt RISC-V: Remove do_IRQ() function
arch/riscv/Kconfig | 1 + arch/riscv/include/asm/irq.h | 5 -- arch/riscv/include/asm/smp.h | 3 + arch/riscv/kernel/entry.S | 4 +- arch/riscv/kernel/irq.c | 33 +------- arch/riscv/kernel/smp.c | 11 ++- arch/riscv/kernel/traps.c | 2 - drivers/clocksource/timer-riscv.c | 79 ++++++++++++------ drivers/irqchip/Kconfig | 13 +++ drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-riscv-intc.c | 131 ++++++++++++++++++++++++++++++ drivers/irqchip/irq-sifive-plic.c | 39 ++++++++- include/linux/cpuhotplug.h | 2 + 13 files changed, 252 insertions(+), 72 deletions(-) create mode 100644 drivers/irqchip/irq-riscv-intc.c
-- 2.17.1
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