[PATCH v2 0/4] irqchip: add EyeQ5 PCIe MSI controller

[Gregory CLEMENT <gregory.clement@bootlin.com>]

Hello,

This series adds support for the MSI controller present in the
Mobileye EyeQ5 PCIe ports.

Although the driver uses the standard MSI library, the EyeQ5 hardware
has several specific features. First, each PCIe port has its own MSI
controller, which snoops the MSI write TLPs that the port receives. A
port supports a maximum of 4 MSI vectors, and the memory-region
property gives the base address of the doorbell window. In addition,
the GCSR mode selects the role: in root complex mode the driver
registers a PCI MSI parent, while in endpoint mode it registers a
platform MSI parent. The last specific point is that the driver uses
the snooper domain as a chained controller on one GIC interrupt.

The series adds the binding document, the irqchip driver, the EyeQ5
DTS changes, and the MAINTAINERS entry. In particular, the DTS changes
add the two MSI controllers to the EyeQ5 SoC.

I tested the series on two EyeQ5 SoCs that have a PCIe link. One SoC
acted as the host and the other SoC acted as the endpoint. The
pci_endpoint_test kselftest passed the MSI-X and DOORBELL_TEST cases.
The MSI test uses one vector because the controller does not support
standard Multi-MSI. An additional test made sure that each MSI-X vector
uses its target CPU (using affinity).

Grégory

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
Changes in v2:
- Address review comments from Krzysztof Kozlowski, Thomas Gleixner and
  sashiko.
- dt-bindings: drop the num-vectors property (all ports have four
  vectors) and simplify the example.
- irqchip: use the fixed four-vector count, add lockdep assertions, and
  dispatch through generic_handle_demux_domain_irq() with a redirect-based
  irq_set_affinity() callback.
- irqchip: drop MSI_FLAG_MULTI_PCI_MSI (standard Multi-MSI cannot work
  with the address-based vector decoding) and MSI_FLAG_NO_AFFINITY; add
  MSI_FLAG_PCI_MSI_MASK_PARENT.
- irqchip: keep vectors masked during allocation, mask all vectors and
  clear pending status before installing the chained handler, and reject
  of_irq_get() returning 0.
- MIPS: dts: drop the num-vectors property from both MSI nodes.
- Reformat the driver for the 100-column limit.
- Link to v1: https://patch.msgid.link/20261028-eyeq5_msi-v1-0-c464752fb55f@bootlin.com

To: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
To: Benoît Monin <benoit.monin@bootlin.com>
To: Gregory CLEMENT <gregory.clement@bootlin.com>
To: Théo Lebrun <theo.lebrun@bootlin.com>
To: Thomas Gleixner <tglx@kernel.org>
To: Radu Rendec <radu@rendec.net>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org

---
Gregory CLEMENT (4):
      dt-bindings: interrupt-controller: add Mobileye EyeQ5 PCIe MSI controller
      irqchip: irq-eyeq5-msi: add EyeQ5 PCIe MSI controller driver
      MIPS: dts: eyeq5: add MSI controllers
      MAINTAINERS: add EyeQ5 MSI controller entry

 .../interrupt-controller/mobileye,eyeq5-msi.yaml   |  90 +++++
 MAINTAINERS                                        |   2 +
 arch/mips/Kconfig                                  |   1 +
 arch/mips/boot/dts/mobileye/eyeq5.dtsi             |  28 ++
 drivers/irqchip/Kconfig                            |   5 +
 drivers/irqchip/Makefile                           |   1 +
 drivers/irqchip/irq-eyeq5-msi.c                    | 439 +++++++++++++++++++++
 7 files changed, 566 insertions(+)
---
base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
change-id: 20261028-eyeq5_msi-86aa1d590684

Best regards,
--  
Grégory CLEMENT, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com