linux-kernel - Re: [PATCH v2 03/24] MIPS: PCI: Use pci_enable

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Message-ID: <20251013210236.GA864224@bhelgaas>
Date: Mon, 13 Oct 2025 16:02:36 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	regressions@...ts.linux.dev
Subject: Re: [PATCH v2 03/24] MIPS: PCI: Use pci_enable_resources()

[+cc regressions]

On Mon, Oct 13, 2025 at 12:54:25PM -0700, Guenter Roeck wrote:
> On Fri, Aug 29, 2025 at 04:10:52PM +0300, Ilpo Järvinen wrote:
> > pci-legacy.c under MIPS has a copy of pci_enable_resources() named as
> > pcibios_enable_resources(). Having own copy of same functionality could
> > lead to inconsistencies in behavior, especially now as
> > pci_enable_resources() and the bridge window resource flags behavior are
> > going to be altered by upcoming changes.
> > 
> > The check for !r->start && r->end is already covered by the more generic
> > checks done in pci_enable_resources().
> > 
> > Call pci_enable_resources() from MIPS's pcibios_enable_device() and remove
> > pcibios_enable_resources().
> > 
> > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> 
> This patch causes boot failures when trying to boot mips images from
> ide drive in qemu. As far as I can see the interface no longer instantiates.
> 
> Reverting this patch 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
> # bad: [ebe091ad81e1d3e5cbb1592ebc18175b5ca3d2bd] PCI: Use pbus_select_window_for_type() during IO window sizing
> git bisect bad ebe091ad81e1d3e5cbb1592ebc18175b5ca3d2bd
> # bad: [2ee33aa14d3f2e92ba8ae80443f2cd9b575f08cb] PCI: Always claim bridge window before its setup
> git bisect bad 2ee33aa14d3f2e92ba8ae80443f2cd9b575f08cb
> # good: [2657a0c982239fecc41d0df5a69091ca4297647c] m68k/PCI: Use pci_enable_resources() in pcibios_enable_device()
> git bisect good 2657a0c982239fecc41d0df5a69091ca4297647c
> # bad: [ae81aad5c2e17fd1fafd930e75b81aedc837f705] MIPS: PCI: Use pci_enable_resources()
> git bisect bad ae81aad5c2e17fd1fafd930e75b81aedc837f705
> # good: [754babaaf33349d9ef27bb1ac6f5d9d5a503a2a6] sparc/PCI: Remove pcibios_enable_device() as they do nothing extra
> git bisect good 754babaaf33349d9ef27bb1ac6f5d9d5a503a2a6
> # first bad commit: [ae81aad5c2e17fd1fafd930e75b81aedc837f705] MIPS: PCI: Use pci_enable_resources()

#regzbot introduced: ae81aad5c2e1 ("MIPS: PCI: Use pci_enable_resources()")