[PATCH v2 0/4] irqchip/sg2042-msi: Fix broken affinity setting

[Inochi Amaoto <inochiama@gmail.com>]

When using NVME on SG2044, the NVME always complains "I/O tag XXX
(XXX) QID XX timeout, completion polled", which is caused by the
broken handler of the sg2042-msi driver.

As PLIC driver can only setting affinity when enabling, the sg2042-msi
does not properly handled affinity setting previously and enable irq in
an unexpected executing path.

Add irq_startup/irq_shutdown support to the PCI template domain,
then set irq_chip_[startup/shutdown]_parent for irq_startup/
irq_shutdown of the sg2042-msi driver. So the irq can be started
properly.

Change from v1:
1. patch 1: Fix comment format problem, and structure the changelog.
2. patch 2: Improve the comment title and body, add describtion about
            the fact the PLIC is used as parent chip.
3. patch 2: Remove __always_inline for cond_[shutdown/startup]_parent().
4. patch 3: Update the align of the "XXX_MSI_FLAGS_XXX" macro.
5. patch 4: Claim the fact that the added flag is used by the negotiation
            of MSI controller driver and PCIe device driver, and can be
	    only used when both of them support this flag.

Inochi Amaoto (4):
  genirq: Add irq_chip_(startup/shutdown)_parent()
  PCI/MSI: Add startup/shutdown for per device domains
  irqchip/sg2042-msi: Fix broken affinity setting
  irqchip/sg2042-msi: Set MSI_FLAG_MULTI_PCI_MSI flags for SG2044

 drivers/irqchip/irq-sg2042-msi.c | 19 +++++++++---
 drivers/pci/msi/irqdomain.c      | 52 ++++++++++++++++++++++++++++++++
 include/linux/irq.h              |  2 ++
 include/linux/msi.h              |  2 ++
 kernel/irq/chip.c                | 37 +++++++++++++++++++++++
 5 files changed, 107 insertions(+), 5 deletions(-)

--
2.50.1