linux-kernel - [PATCH v2 0/7] PCI: Solve two bridge window sizing issues

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Date: Thu, 28 Dec 2023 18:57:00 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Igor Mammedov <imammedo@...hat.com>,
	Lukas Wunner <lukas@...ner.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...el.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 0/7] PCI: Solve two bridge window sizing issues

Hi all,

Here's a series that contains two fixes to PCI bridge window sizing
algorithm. Together, they should enable remove & rescan cycle to work
for a PCI bus that has PCI devices with optional resources and/or
disparity in BAR sizes.

For the second fix, I chose to expose find_empty_resource_slot() from
kernel/resource.c because it should increase accuracy of the cannot-fit
decision (currently that function is called find_resource()). In order
to do that sensibly, a few improvements seemed in order to make its
interface and name of the function sane before exposing it. Thus, the
few extra patches on resource side.

Unfortunately I don't have a reason to suspect these would help with
the issues related to the currently ongoing resource regression
thread [1].

[1] https://lore.kernel.org/linux-pci/ZXpaNCLiDM+Kv38H@marvin.atrad.com.au/

v2:
- Add "typedef" to kerneldoc to get correct formatting
- Use RESOURCE_SIZE_MAX instead of literal
- Remove unnecessary checks for io{port/mem}_resource
- Apply a few style tweaks from Andy

Ilpo Järvinen (7):
  PCI: Fix resource double counting on remove & rescan
  resource: Rename find_resource() to find_empty_resource_slot()
  resource: Document find_empty_resource_slot() and resource_constraint
  resource: Use typedef for alignf callback
  resource: Handle simple alignment inside __find_empty_resource_slot()
  resource: Export find_empty_resource_slot()
  PCI: Relax bridge window tail sizing rules

 drivers/pci/bus.c       | 10 ++----
 drivers/pci/setup-bus.c | 80 +++++++++++++++++++++++++++++++++++++----
 include/linux/ioport.h  | 44 ++++++++++++++++++++---
 include/linux/pci.h     |  5 +--
 kernel/resource.c       | 68 ++++++++++++++++-------------------
 5 files changed, 148 insertions(+), 59 deletions(-)

-- 
2.30.2