linux-kernel - [PATCH v2 0/9] irqchip: MSI parent cleanup and PCI host driver conversion

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Message-Id: <20250513172819.2216709-1-maz@kernel.org>
Date: Tue, 13 May 2025 18:28:10 +0100
From: Marc Zyngier <maz@...nel.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Toan Le <toan@...amperecomputing.com>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>
Subject: [PATCH v2 0/9] irqchip: MSI parent cleanup and PCI host driver conversion

This is v2 of a series I posted[1] a few months back before running
out of time, energy, and interest. I have now reduced it to the stuff
I actually care about, and got rid of all things non-arm64.

I've become annoyed by the couple of machines I have around that
haven't been converted to the per-device MSI infrastructure.  At the
same time, I've also moaned at the amount of boilerplate code required
to make use of this infrastructure.

This series therefore does a number of things:

- make irq-msi-lib.h globally available, so that PCI (and other
  subsystems) may make use of it

- add a new helper (msi_create_parent_irq_domain()) that encapsulates
  most of the magic required to create an MSI-parent domain

- convert the arm64 I have access to (and *only* that)

- convert the Apple, XGene and Tegra MSI drivers to the MSI-parent
  infrastructure, which is why I came here the first place.

* From v1 [1]:

  - use irq_domain_info as an the holder of most information required
    to instantiate the domain. I decided against using a specific
    structure, because they would mostly have the same fields.

  - added a patch to convert the Tegra driver, which required dealing
    with the MSI_FLAG_NO_AFFINITY flag

  - got rid of x86 and riscv patches (life is too short).

[1] https://lore.kernel.org/all/20241204124549.607054-1-maz@kernel.org

Marc Zyngier (9):
  irqchip: Make irq-msi-lib.h globally available
  genirq/msi: Add helper for creating MSI-parent irq domains
  irqchip/gic: Convert to msi_create_parent_irq_domain() helper
  irqchip/mvebu: Convert to msi_create_parent_irq_domain() helper
  irqchip: Drop MSI_CHIP_FLAG_SET_ACK from unsuspecting MSI drivers
  irqchip/msi-lib: Honour the MSI_FLAG_NO_AFFINITY flag
  PCI: apple: Convert to MSI parent infrastructure
  PCI: xgene: Convert to MSI parent infrastructure
  PCI: tegra: Convert to MSI parent infrastructure

 drivers/irqchip/irq-bcm2712-mip.c             |  2 +-
 drivers/irqchip/irq-gic-v2m.c                 | 16 ++---
 drivers/irqchip/irq-gic-v3-its-msi-parent.c   |  4 +-
 drivers/irqchip/irq-gic-v3-its.c              | 21 +++----
 drivers/irqchip/irq-gic-v3-mbi.c              | 15 ++---
 drivers/irqchip/irq-imx-mu-msi.c              |  2 +-
 drivers/irqchip/irq-loongarch-avec.c          |  2 +-
 drivers/irqchip/irq-loongson-pch-msi.c        |  2 +-
 drivers/irqchip/irq-msi-lib.c                 |  9 ++-
 drivers/irqchip/irq-mvebu-gicp.c              | 18 +++---
 drivers/irqchip/irq-mvebu-icu.c               |  2 +-
 drivers/irqchip/irq-mvebu-odmi.c              | 18 +++---
 drivers/irqchip/irq-mvebu-sei.c               | 18 +++---
 drivers/irqchip/irq-riscv-imsic-platform.c    |  2 +-
 drivers/irqchip/irq-sg2042-msi.c              |  2 +-
 drivers/pci/controller/Kconfig                |  3 +
 drivers/pci/controller/pci-tegra.c            | 60 ++++++------------
 drivers/pci/controller/pci-xgene-msi.c        | 46 +++++---------
 drivers/pci/controller/pcie-apple.c           | 62 +++++++------------
 .../linux}/irqchip/irq-msi-lib.h              |  6 +-
 include/linux/msi.h                           |  4 ++
 kernel/irq/msi.c                              | 26 ++++++++
 22 files changed, 160 insertions(+), 180 deletions(-)
 rename {drivers => include/linux}/irqchip/irq-msi-lib.h (84%)

-- 
2.39.2