[PATCH v2 0/4] IRQ affinity support in PLIC driver

From: Anup Patel
Date: Tue Nov 27 2018 - 05:03:33 EST

This patchset primarily adds IRQ affinity support in PLIC driver and
other improvements.

The patchset gives mechanism for explicitly routing external interrupts to
particular CPUs using smp_affinity attribute of each Linux IRQs. Also, we
can now use IRQ balancer from kernel-space or user-space.

The patchset is tested on QEMU virt machine. It is based on Linux-4.20-rc4
and can be found at riscv_plic_irq_affinity_v2 branch of:

Changes since v1:
- Removed few whitspace changes from PATCH1
- Keep use of DEFINE_PER_CPU() as it is

Anup Patel (4):
irqchip: sifive-plic: Pre-compute context hart base and enable base
irqchip: sifive-plic: More flexible plic_irq_toggle()
irqchip: sifive-plic: Differentiate between PLIC handler and context
irqchip: sifive-plic: Implement irq_set_affinity() for SMP host

drivers/irqchip/irq-sifive-plic.c | 144 ++++++++++++++++++------------
1 file changed, 86 insertions(+), 58 deletions(-)