lkml.org 
[lkml]   [2018]   [Sep]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v2 0/5] New RISC-V Local Interrupt Controller Driver
Date
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: 1256 1269 1276 1262 RISC-V INTC 5 riscv_timer
8: 6 15 7 16 SiFive PLIC 8 virtio0
10: 22 12 12 21 SiFive PLIC 10 ttyS0

The patchset is based up Linux-4.19-rc2 and can be found at
riscv_intc_v2 branch of:
https://github.com/avpatel/linux.git

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: No need to pass scause as arg to do_IRQ()
irqchip: RISC-V Local Interrupt Controller Driver
clocksource: riscv_timer: Make timer interrupt as a per-CPU interrupt
RISC-V: Remove do_IRQ() function

arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/irq.h | 17 +++-
arch/riscv/include/asm/smp.h | 3 +
arch/riscv/kernel/entry.S | 5 +-
arch/riscv/kernel/irq.c | 47 +---------
arch/riscv/kernel/smp.c | 11 ++-
drivers/clocksource/riscv_timer.c | 78 ++++++++++++----
drivers/irqchip/Kconfig | 15 ++-
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-riscv-intc.c | 148 ++++++++++++++++++++++++++++++
drivers/irqchip/irq-sifive-plic.c | 20 +++-
include/linux/cpuhotplug.h | 1 +
12 files changed, 273 insertions(+), 74 deletions(-)
create mode 100644 drivers/irqchip/irq-riscv-intc.c

--
2.17.1

\
 
 \ /
  Last update: 2018-09-06 14:38    [W:0.080 / U:0.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site