[PATCH v3 0/6] IRQ affinity support in PLIC driver

[Anup Patel]

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_v3 branch of:
https://github.com/avpatel/linux.git

Changes since v2:
 - Fixed incorrect address of enable registers using sizeof(u32) in PATCH1
 - Retained comment about need for locking in PATCH1
 - Split PATCH2 into two patches
 - Split PATCH3 into two patches
 - Minor fix in commit description of PATCH4

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

Anup Patel (6):
  irqchip: sifive-plic: Pre-compute context hart base and enable base
  irqchip: sifive-plic: Add struct plic_hw for global PLIC HW details
  irqchip: sifive-plic: More flexible plic_irq_toggle()
  irqchip: sifive-plic: Add warning in plic_init() if handler already
    present
  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 | 143 +++++++++++++++++++-----------
 1 file changed, 90 insertions(+), 53 deletions(-)

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2.17.1