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[v6,0/4] IRQ affinity support in PLIC driver

Message ID 20190212125246.69239-1-anup@brainfault.org (mailing list archive)
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Series IRQ affinity support in PLIC driver | expand

Message

Anup Patel Feb. 12, 2019, 12:52 p.m. UTC 
This patchset primarily adds IRQ affinity support in PLIC driver and
other improvements.

It gives mechanism for explicitly route 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-5.0-rc6
and can be found at riscv_plic_irq_affinity_v6 branch of:
https://github.com/avpatel/linux.git

Changes since v5:
 - Dropped PATCH2 based on discussion with Christoph

Changes since v4:
 - Use "if (force)" instead of "if (!force)" in PATCH5

Changes since v3:
 - Dropped PATCH2
 - Added PATCH to not inline plic_toggle() and plic_irq_toggle()
 - Moved PATCH3 changes to PATCH6
 - Used WARN_ON_ONCE() instead of WARN_ON() in PATCH5

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 (4):
  irqchip: sifive-plic: Pre-compute context hart base and enable base
  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 | 111 +++++++++++++++++++-----------
 1 file changed, 72 insertions(+), 39 deletions(-)

Comments

Marc Zyngier Feb. 14, 2019, 12:33 p.m. UTC | #1 
On Tue, 12 Feb 2019 12:52:42 +0000,
Anup Patel <anup@brainfault.org> wrote:
> 
> This patchset primarily adds IRQ affinity support in PLIC driver and
> other improvements.
> 
> It gives mechanism for explicitly route 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-5.0-rc6
> and can be found at riscv_plic_irq_affinity_v6 branch of:
> https://github.com/avpatel/linux.git

Applied to irqchip-next.

Thanks,

	M.