linux-kernel - Re: [PATCH 1/2] PCI: Setup bridge resources earlier

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Message-ID: <df266709-a9b3-4fd8-af3a-c22eb3c9523a@roeck-us.net>
Date: Mon, 13 Oct 2025 11:07:33 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kw@...ux.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-kernel@...r.kernel.org,
	Lucas De Marchi <lucas.demarchi@...el.com>
Subject: Re: [PATCH 1/2] PCI: Setup bridge resources earlier

Hi,

On Wed, Sep 24, 2025 at 04:42:27PM +0300, Ilpo Järvinen wrote:
> Bridge windows are read twice from PCI Config Space, the first read is
> made from pci_read_bridge_windows() which does not setup the device's
> resources. It causes problems down the road as child resources of the
> bridge cannot check whether they reside within the bridge window or
> not.
> 
> Setup the bridge windows already in pci_read_bridge_windows().
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---

This patch causes some boot test failures for me. Specifically, booting
alpha images from PCI through a PCI bridge fails. Reverting it fixes
the problem.

Bisect log attached for reference.

Guenter

---
# bad: [3a8660878839faadb4f1a6dd72c3179c1df56787] Linux 6.18-rc1
# good: [e5f0a698b34ed76002dc5cff3804a61c80233a7a] Linux 6.17
git bisect start 'HEAD' 'v6.17'
# good: [58809f614e0e3f4e12b489bddf680bfeb31c0a20] Merge tag 'drm-next-2025-10-01' of https://gitlab.freedesktop.org/drm/kernel
git bisect good 58809f614e0e3f4e12b489bddf680bfeb31c0a20
# good: [bed0653fe2aacb0ca8196075cffc9e7062e74927] Merge tag 'iommu-updates-v6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux
git bisect good bed0653fe2aacb0ca8196075cffc9e7062e74927
# good: [6a74422b9710e987c7d6b85a1ade7330b1e61626] Merge tag 'mips_6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
git bisect good 6a74422b9710e987c7d6b85a1ade7330b1e61626
# bad: [522ba450b56fff29f868b1552bdc2965f55de7ed] Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
git bisect bad 522ba450b56fff29f868b1552bdc2965f55de7ed
# bad: [256e3417065b2721f77bcd37331796b59483ef3b] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
git bisect bad 256e3417065b2721f77bcd37331796b59483ef3b
# bad: [2f2c7254931f41b5736e3ba12aaa9ac1bbeeeb92] Merge tag 'pci-v6.18-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
git bisect bad 2f2c7254931f41b5736e3ba12aaa9ac1bbeeeb92
# bad: [531abff0fa53bc3a2f7f69b2693386eb6bda96e5] Merge branch 'pci/controller/qcom'
git bisect bad 531abff0fa53bc3a2f7f69b2693386eb6bda96e5
# bad: [fead6a0b15bf3b33dba877efec6b4e7b4cc4abc3] Merge branch 'pci/resource'
git bisect bad fead6a0b15bf3b33dba877efec6b4e7b4cc4abc3
# good: [0bb65e32495e6235a069b60e787140da99e9c122] Merge branch 'pci/p2pdma'
git bisect good 0bb65e32495e6235a069b60e787140da99e9c122
# good: [ebe091ad81e1d3e5cbb1592ebc18175b5ca3d2bd] PCI: Use pbus_select_window_for_type() during IO window sizing
git bisect good ebe091ad81e1d3e5cbb1592ebc18175b5ca3d2bd
# good: [15c5867b0ae6a47914b45daf3b64e2d2aceb4ee5] PCI: Don't print stale information about resource
git bisect good 15c5867b0ae6a47914b45daf3b64e2d2aceb4ee5
# good: [dc32e9346b26ba33e84ec3034a1e53a9733700f9] PCI/pwrctrl: Fix device leak at device stop
git bisect good dc32e9346b26ba33e84ec3034a1e53a9733700f9
# good: [4c5cd8d64172de3730056366dc61392a3f2f003a] Merge branch 'pci/pm'
git bisect good 4c5cd8d64172de3730056366dc61392a3f2f003a
# bad: [a43ac325c7cbbfe72bdf9178059b3ee9f5a2c7dd] PCI: Set up bridge resources earlier
git bisect bad a43ac325c7cbbfe72bdf9178059b3ee9f5a2c7dd
# first bad commit: [a43ac325c7cbbfe72bdf9178059b3ee9f5a2c7dd] PCI: Set up bridge resources earlier