linux-kernel - [PATCH v7-incomplete 0/3] PCI: Add support for preserving boot configuration

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Message-Id: <20240421190914.374399-1-helgaas@kernel.org>
Date: Sun, 21 Apr 2024 14:09:11 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Vidya Sagar <vidyas@...dia.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Will Deacon <will@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Krishna Thota <kthota@...dia.com>,
	Manikanta Maddireddy <mmaddireddy@...dia.com>,
	Vidya Sagar <sagar.tv@...il.com>,
	linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v7-incomplete 0/3] PCI: Add support for preserving boot configuration

From: Bjorn Helgaas <bhelgaas@...gle.com>

This is Vidya's work; I started splitting it into separate patches.

This is based on v6
(https://lore.kernel.org/r/20240418174043.3750240-1-vidyas@nvidia.com) but
is missing a few pieces, so it's not complete yet.  I just wanted to show
the idea of what I had in mind.

The missing pieces are:

  - Set PCI_REASSIGN_ALL_BUS if !PCI_PROBE_ONLY

  - Use bridge->preserve_config instead of PCI_PROBE_ONLY

  - Change to use pci_assign_unassigned_root_bus_resources() instead of 
    pci_bus_size_bridge() and pci_bus_assign_resources()

Bjorn Helgaas (3):
  PCI: Move PRESERVE_BOOT_CONFIG _DSM evaluation to
    pci_register_host_bridge()
  PCI: of: Add of_pci_preserve_config() for per-host bridge support
  PCI: Unify ACPI and DT 'preserve config' support

 drivers/acpi/pci_root.c | 12 ---------
 drivers/pci/of.c        | 60 ++++++++++++++++++++++++++++++++---------
 drivers/pci/pci-acpi.c  | 22 +++++++++++++++
 drivers/pci/pci.h       | 12 +++++++++
 drivers/pci/probe.c     | 14 ++++++++++
 5 files changed, 95 insertions(+), 25 deletions(-)

-- 
2.34.1