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

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Message-ID: <9085ab12-1559-4462-9b18-f03dcb9a4088@roeck-us.net>
Date: Mon, 13 Oct 2025 12:54:25 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: Re: [PATCH v2 03/24] MIPS: PCI: Use pci_enable_resources()

Hi,

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()