| Message ID | 20200309110211.91130-1-anup.patel@wdc.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | New RISC-V Local Interrupt Controller Driver | expand |
Fixed Marc's email address. On Mon, Mar 9, 2020 at 4:32 PM Anup Patel <anup.patel@wdc.com> wrote: > > 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 this new driver over previous one are: > 1. It registers all local interrupts as per-CPU interrupts > 2. The KVM RISC-V can use this driver to implement interrupt > handler for per-HART guest external interrupt defined by > the RISC-V H-Extension > 3. In future, we can develop drivers for devices with per-HART > interrupts without changing arch code or this driver > > 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-rc5 and can be found at riscv_intc_v4 > branch of: https://github.com/avpatel/linux.git > > Changes since v3: > - Rebased to Linux-5.6-rc5 and Atish's PLIC patches > - Added separate patch to rename and move plic_find_hart_id() > to arch directory > - Use riscv_of_parent_hartid() in riscv_intc_init() instead of > atomic counter > > 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 (5): > RISC-V: self-contained IPI handling routine > RISC-V: Rename and move plic_find_hart_id() to arch directory > 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/processor.h | 1 + > arch/riscv/include/asm/smp.h | 3 + > arch/riscv/kernel/cpu.c | 16 ++++ > 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 | 134 +++++++++++++++++++++++++++++ > drivers/irqchip/irq-sifive-plic.c | 40 ++++----- > include/linux/cpuhotplug.h | 1 + > 15 files changed, 256 insertions(+), 88 deletions(-) > create mode 100644 drivers/irqchip/irq-riscv-intc.c > > -- > 2.17.1 >
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 this new driver over previous one are: 1. It registers all local interrupts as per-CPU interrupts 2. The KVM RISC-V can use this driver to implement interrupt handler for per-HART guest external interrupt defined by the RISC-V H-Extension 3. In future, we can develop drivers for devices with per-HART interrupts without changing arch code or this driver 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-rc5 and can be found at riscv_intc_v4 branch of: https://github.com/avpatel/linux.git Changes since v3: - Rebased to Linux-5.6-rc5 and Atish's PLIC patches - Added separate patch to rename and move plic_find_hart_id() to arch directory - Use riscv_of_parent_hartid() in riscv_intc_init() instead of atomic counter 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 (5): RISC-V: self-contained IPI handling routine RISC-V: Rename and move plic_find_hart_id() to arch directory 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/processor.h | 1 + arch/riscv/include/asm/smp.h | 3 + arch/riscv/kernel/cpu.c | 16 ++++ 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 | 134 +++++++++++++++++++++++++++++ drivers/irqchip/irq-sifive-plic.c | 40 ++++----- include/linux/cpuhotplug.h | 1 + 15 files changed, 256 insertions(+), 88 deletions(-) create mode 100644 drivers/irqchip/irq-riscv-intc.c