linux-kernel - [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices

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Date:   Mon, 20 Sep 2021 12:11:30 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        <lokeshvutla@...com>
Subject: [PATCH 0/3] PCI/gic-v3-its: Add support for same ITS device ID for multiple PCIe devices

AM64 has an issue in that it doesn't trigger interrupt if the address
in the *pre_its_window* is not aligned to 8-bytes (this is due to an
invalid bridge configuration in HW).

This means there will not be interrupts for devices with PCIe
requestor ID 0x1, 0x3, 0x5..., as the address in the pre-ITS window
would be 4 (1 << 2), 12 (3 << 2), 20 (5 << 2) respectively which are
not aligned to 8-bytes.

The DT binding has specified "msi-map-mask" using which multiple PCIe
devices could be made to use the same ITS device ID.

Add support in irq-gic-v3-its-pci-msi.c for such cases where multiple
PCIe devices are using the same ITS device ID.

Kishon Vijay Abraham I (3):
  PCI: Add support in pci_walk_bus() to invoke callback matching RID
  PCI: Export find_pci_root_bus()
  irqchip/gic-v3-its: Include "msi-map-mask" for calculating nvecs

 drivers/irqchip/irq-gic-v3-its-pci-msi.c | 21 ++++++++++++++++++++-
 drivers/pci/bus.c                        | 13 +++++++++----
 drivers/pci/host-bridge.c                |  3 ++-
 include/linux/pci.h                      |  8 ++++++--
 4 files changed, 37 insertions(+), 8 deletions(-)

-- 
2.17.1