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mpc85xx: Drop pci aliases to avoid domain changes

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As of upstream Linux commit 0fe1e96fef0a ("powerpc/pci: Prefer PCI
domain assignment via DT 'linux,pci-domain' and alias"), the PCIe
domain address is no longer numbered by the lowest 16 bits of the PCI
register address after a fallthrough. Instead of the fallthrough, the
enumeration process accepts the alias ID (as determined by
`of_alias_scan()`). This causes e.g.:

9000:00:00.0 PCI bridge: Freescale Semiconductor Inc P1020E (rev 11)
9000:01:00.0 Network controller: Qualcomm Atheros AR958x 802.11abgn ...

to become

0000:00:00.0 PCI bridge: Freescale Semiconductor Inc P1020E (rev 11)
0000:01:00.0 Network controller: Qualcomm Atheros AR958x 802.11abgn ...

... which then causes the sysfs path of the netdev to change,
invalidating the `wifi_device.path`s enumerated in
`/etc/config/wireless`.

One other solution might be to migrate the uci configuration, as was
done for mvebu in commit 0bd5aa89fc ("mvebu: Migrate uci config to
new PCIe path"). However, there are concerns that the sysfs path will
change once again once some upstream patches[^2][^3] are merged and
backported (and `CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT` is enabled).

Instead, remove the aliases and allow the fallthrough to continue for
now. We will provide a migration in a later release.

This was first reported as a Github issue[^1].

[^1]: https://github.com/openwrt/openwrt/issues/10530
[^2]: https://lore.kernel.org/linuxppc-dev/20220706104308.5390-1-pali@kernel.org/t/#u
[^3]: https://lore.kernel.org/linuxppc-dev/20220706101043.4867-1-pali@kernel.org/

Fixes: #10530
Tested-by: Martin Kennedy <hurricos@gmail.com>
[Tested on the Aerohive HiveAP 330 and Extreme Networks WS-AP3825i]
Signed-off-by: Martin Kennedy <hurricos@gmail.com>
This commit is contained in:
Martin Kennedy 2022-08-29 20:47:24 -04:00 committed by Hauke Mehrtens
parent e9f12931e6
commit 7f4b4c29f3
6 changed files with 80 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
target/linux/mpc85xx/files/arch/powerpc/boot/dts/hiveap-330.dts
View File

@ -300,3 +300,16 @@
};
};
/include/ "fsl/p1020si-post.dtsi"
/*
* For the OpenWrt 22.03 release, since Linux 5.10.138 now uses
* aliases to determine PCI domain numbers, drop aliases so as not to
* change the sysfs path of our wireless netdevs.
*/
/ {
aliases {
/delete-property/ pci0;
/delete-property/ pci1;
};
};

14
target/linux/mpc85xx/files/arch/powerpc/boot/dts/panda.dts
View File

@ -265,3 +265,17 @@
};
};
/include/ "fsl/p1020si-post.dtsi"
/*
* For the OpenWrt 22.03 release, since Linux 5.10.138 now uses
* aliases to determine PCI domain numbers, drop aliases so as not to
* change the sysfs path of our wireless netdevs.
*/
/ {
aliases {
/delete-property/ pci0;
/delete-property/ pci1;
};
};

14
target/linux/mpc85xx/files/arch/powerpc/boot/dts/red-15w-rev1.dts
View File

@ -214,3 +214,17 @@
};
/include/ "fsl/p1010si-post.dtsi"
/*
* For the OpenWrt 22.03 release, since Linux 5.10.138 now uses
* aliases to determine PCI domain numbers, drop aliases so as not to
* change the sysfs path of our wireless netdevs.
*/
/ {
aliases {
/delete-property/ pci0;
/delete-property/ pci1;
};
};

13
target/linux/mpc85xx/files/arch/powerpc/boot/dts/tl-wdr4900-v1.dts
View File

@ -302,3 +302,16 @@
/delete-node/ crypto@30000; /* Pulled in by p1010si-post */
};
};
/*
* For the OpenWrt 22.03 release, since Linux 5.10.138 now uses
* aliases to determine PCI domain numbers, drop aliases so as not to
* change the sysfs path of our wireless netdevs.
*/
/ {
aliases {
/delete-property/ pci0;
/delete-property/ pci1;
};
};

13
target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3710i.dts
View File

@ -173,3 +173,16 @@
};
/include/ "fsl/p1020si-post.dtsi"
/*
* For the OpenWrt 22.03 release, since Linux 5.10.138 now uses
* aliases to determine PCI domain numbers, drop aliases so as not to
* change the sysfs path of our wireless netdevs.
*/
/ {
aliases {
/delete-property/ pci0;
/delete-property/ pci1;
};
};

13
target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts
View File

@ -253,3 +253,16 @@
};
/include/ "fsl/p1020si-post.dtsi"
/*
* For the OpenWrt 22.03 release, since Linux 5.10.138 now uses
* aliases to determine PCI domain numbers, drop aliases so as not to
* change the sysfs path of our wireless netdevs.
*/
/ {
aliases {
/delete-property/ pci0;
/delete-property/ pci1;
};
};