linux-kernel - [PATCH v3 0/2] PCI: Init RCB from pci_configure_device and fix program_hpx

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Message-ID: <20260122130957.68757-1-haakon.bugge@oracle.com>
Date: Thu, 22 Jan 2026 14:09:52 +0100
From: Håkon Bugge <haakon.bugge@...cle.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: Alex Williamson <alex@...zbot.org>,
        Johannes Thumshirn <morbidrsa@...il.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: [PATCH v3 0/2] PCI: Init RCB from pci_configure_device and fix program_hpx_type2

This series add the initialization of the Link Control register's RCB
to pci_configure_rcb() called from pci_configure_device() and also
cleans up the incorrect program_hpx_type2():

1. It should only be called when we own the PCIe native hotplug and
   not the AER ownership
2. It should only manipulate the AER-bits

In addition, the second commit adds a warning if the _HPX type2
record attempts to modify the Link Control register.

The programming of the device's RCB is constrained to the device types
where it is applicable and also skips VFs. If the Root Port's RCB
cannot be determined, we also skip the programming of the device's
RCB.

Then, we program the device's RCB according to the Root Port's setting.

Håkon Bugge (2):
  PCI: Initialize RCB from pci_configure_device
  PCI/ACPI: Confine program_hpx_type2 to the AER bits

 drivers/pci/pci-acpi.c | 61 +++++++++++++++++++-----------------------
 drivers/pci/pci.h      |  3 +++
 drivers/pci/pcie/aer.c |  3 ---
 drivers/pci/probe.c    | 53 ++++++++++++++++++++++++++++++++++++
 4 files changed, 83 insertions(+), 37 deletions(-)

--
2.43.5