linux-kernel - Re: [PATCH 00/23] PCI: Resource code fixes (supercedes earlier series) & cleanups

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Message-ID: <20260126173907.GA275525@bhelgaas>
Date: Mon, 26 Jan 2026 11:39:07 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/23] PCI: Resource code fixes (supercedes earlier
 series) & cleanups

On Fri, Dec 19, 2025 at 07:40:13PM +0200, Ilpo Järvinen wrote:
> Hi all,
> 
> Here's the resource code fixes and cleanups series. The 6 patches (the
> first 5 + 1 cleanup) have been submitted earlier (not yet applied, I've
> closed the patchwork entries for them) but due to a number conflicts
> that could easily ensue if these are applied independently, I had to
> put all these into the same series.
> 
> The series consists of:
> 
> 1. The first 5 are the most important changes as they relate to
>    regressions. These may case shrinkage of bridge windows that
>    previous had surplus space beyond the HP reservation size (due to
>    sizes inherited from FW). In some HP scenarios the smaller bridge
>    window could cause a regression, but this seems a case the pci=hpmm*
>    parameters are meant to address.
> 
> 2. Followed by cleanups (no functional change intended, excluding the
>    extra debug logging added).
> 
> 3. Introduction of pbus_mem_size_optional() to avoid the need to handle
>    optional resource in a deeply nested loop (rebar awareness changes
>    will have to add some code there). Doing all optional calculations
>    in one place feels more logical and consistent anyway. There's a
>    minor functional change in this change related to bridge windows
>    with only optional resources (I don't expect issues because of it).
> 
> 4. Separating CardBus bridge setup code to own file + compile it only
>    when CONFIG_CARDBUS is set (I'd have wanted to send this separately
>    but it seems impractical given that I need to rename the
>    pci_dev_resource handling functions when exposing them to another
>    file).
> 
> Any comments are welcome.
> 
> 
> Ilpo Järvinen (23):
>   PCI: Fix bridge window alignment with optional resources
>   PCI: Rewrite bridge window head alignment function
>   PCI: Stop over-estimating bridge window size
>   resource: Increase MAX_IORES_LEVEL to 8
>   PCI: Remove old_size limit from bridge window sizing
>   PCI: Push realloc check into pbus_size_mem()
>   PCI: Pass bridge window resource to pbus_size_mem()
>   PCI: Use res_to_dev_res() in reassign_resources_sorted()
>   PCI: Fetch dev_res to local var in __assign_resources_sorted()
>   PCI: Add pci_resource_is_bridge_win()
>   PCI: Log reset and restore of resources
>   PCI: Check invalid align earlier in pbus_size_mem()
>   PCI: Add pbus_mem_size_optional() to handle optional sizes
>   resource: Mark res given to resource_assigned() as const
>   PCI: Use resource_assigned() in setup-bus.c algorithm
>   PCI: Properly prefix struct pci_dev_resource handling functions
>   PCI: Separate cardbus setup & build it only with CONFIG_CARDBUS
>   PCI: Handle CardBus specific params in setup-cardbus.c
>   PCI: Use scnprintf() instead of sprintf()
>   PCI: Add Bus Number + Secondary Latency Timer as dword fields
>   PCI: Convert to use Bus Number field defines
>   PCI: Add pbus_validate_busn() for Bus Number validation
>   PCI: Move scanbus bridge scanning to setup-cardbus.c
> 
>  drivers/pci/Makefile          |   1 +
>  drivers/pci/pci-sysfs.c       |   2 +-
>  drivers/pci/pci.c             |  14 +-
>  drivers/pci/pci.h             |  49 ++-
>  drivers/pci/probe.c           | 128 +++----
>  drivers/pci/setup-bus.c       | 644 ++++++++++++----------------------
>  drivers/pci/setup-cardbus.c   | 306 ++++++++++++++++
>  drivers/pci/setup-res.c       |   2 +-
>  drivers/pcmcia/yenta_socket.c |   2 +-
>  include/linux/ioport.h        |   2 +-
>  include/linux/pci.h           |   6 +-
>  include/uapi/linux/pci_regs.h |   5 +
>  kernel/resource.c             |   2 +-
>  13 files changed, 648 insertions(+), 515 deletions(-)
>  create mode 100644 drivers/pci/setup-cardbus.c

Sorry I missed this earlier.  I put these on pci/resource, hoping we
can still make it for v6.20 since we have an extra week in the cycle
(two weeks left until v6.19 final).