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From: anup@brainfault.org (Anup Patel)
To: linux-riscv@lists.infradead.org
Subject: [RFC PATCH 0/5] New RISC-V Local Interrupt Controller Driver
Date: Tue,  4 Sep 2018 18:15:09 +0530	[thread overview]
Message-ID: <20180904124514.6290-1-anup@brainfault.org> (raw)

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       
  5:        995       1012        997       1015  RISC-V INTC   5 Edge      riscv_timer
  8:         23          6         10          7  SiFive PLIC   8 Edge      virtio0
 10:          9         10          5          4  SiFive PLIC  10 Edge      ttyS0

The patchset is based up Linux-4.19-rc2 and can be found at
riscv_intc_v1 branch of:
https://github.com/avpatel/linux.git

Anup Patel (5):
  RISC-V: Make IPI triggering flexible
  RISC-V: No need to pass scause as arg to do_IRQ()
  RISC-V: Select useful GENERIC_IRQ kconfig options
  irqchip: RISC-V Local Interrupt Controller Driver
  clocksource: riscv_timer: Make timer interrupt as a per-CPU interrupt

 arch/riscv/Kconfig                |   4 +
 arch/riscv/include/asm/irq.h      |  16 ++-
 arch/riscv/include/asm/smp.h      |  10 ++
 arch/riscv/kernel/entry.S         |   1 -
 arch/riscv/kernel/irq.c           |  45 +--------
 arch/riscv/kernel/smp.c           |  23 ++++-
 drivers/clocksource/riscv_timer.c |  76 ++++++++++++---
 drivers/irqchip/Kconfig           |  15 ++-
 drivers/irqchip/Makefile          |   1 +
 drivers/irqchip/irq-riscv-intc.c  | 156 ++++++++++++++++++++++++++++++
 drivers/irqchip/irq-sifive-plic.c |  21 +++-
 include/linux/cpuhotplug.h        |   1 +
 12 files changed, 301 insertions(+), 68 deletions(-)
 create mode 100644 drivers/irqchip/irq-riscv-intc.c

-- 
2.17.1

             reply	other threads:[~2018-09-04 12:45 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-04 12:45 Anup Patel [this message]
2018-09-04 12:45 ` [RFC PATCH 1/5] RISC-V: Make IPI triggering flexible Anup Patel
2018-09-04 18:50   ` Christoph Hellwig
2018-09-05  4:36     ` Anup Patel
2018-09-05 18:56       ` Christoph Hellwig
2018-09-06  9:45     ` Palmer Dabbelt
2018-09-06 10:45       ` Anup Patel
2018-09-10 13:34         ` Christoph Hellwig
2018-09-11  3:37           ` Anup Patel
2018-09-29  1:45           ` Palmer Dabbelt
2018-09-29  1:45             ` Palmer Dabbelt
2018-09-29  7:06             ` Anup Patel
2018-09-29  7:06               ` Anup Patel
2018-09-04 12:45 ` [RFC PATCH 2/5] RISC-V: No need to pass scause as arg to do_IRQ() Anup Patel
2018-09-04 18:50   ` Christoph Hellwig
2018-09-04 12:45 ` [RFC PATCH 3/5] RISC-V: Select useful GENERIC_IRQ kconfig options Anup Patel
2018-09-04 18:56   ` Christoph Hellwig
2018-09-05  4:52     ` Anup Patel
2018-09-05 18:57       ` Christoph Hellwig
2018-09-04 12:45 ` [RFC PATCH 4/5] irqchip: RISC-V Local Interrupt Controller Driver Anup Patel
2018-09-04 18:57   ` Christoph Hellwig
2018-09-05  6:09     ` Anup Patel
2018-09-05 18:58       ` Christoph Hellwig
2018-09-06 11:53         ` Anup Patel
2018-09-10 13:35           ` Christoph Hellwig
2018-09-04 12:45 ` [RFC PATCH 5/5] clocksource: riscv_timer: Make timer interrupt as a per-CPU interrupt Anup Patel
2018-09-04 18:58   ` Christoph Hellwig
2018-09-05  8:21     ` Anup Patel

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