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SubjectRe: [PATCH v4 1/2] modpost: file2alias: make mdio alias configure match mdio uevent
On Sat, Dec 04, 2021 at 05:13:27PM +0800, Yinbo Zhu wrote:
> The do_mdio_entry was responsible for generating a phy alias configure
> that according to the phy driver's mdio_device_id, before apply this
> patch, which alias configure is like "alias mdio:000000010100000100001
> 1011101????", it doesn't match the phy_id of mdio_uevent, because of
> the phy_id was a hexadecimal digit and the mido uevent is consisit of
> phy_id with the char 'p', the uevent string is different from alias.
> Add this patch that mdio alias configure will can match mdio uevent.
>
> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>


NAK.


> ---
> Change in v4:
> Add following explain information.
>
> Hi Russell King ,
>
>
> I had given you feedback lots of times, but it may be mail list server issue, you don't accept my mail,
>
> and I don't get your mail, then I add that what i want explain in v1 patch for your v1 patch comment,
>
> you can check. then for v3 patch that is for rework commit inforation accorting , just , I notice you
>
> have a comment in v2, but i dont' accept your mail. and I give you explain as follows:
>
>
> > No. I think we've been over the reasons already. It _will_ break
> > existing module loading.
>
> > If I look at the PHY IDs on my Clearfog board:
>
> > /sys/bus/mdio_bus/devices/f1072004.mdio-mii:00/phy_id:0x01410dd1
> > /sys/bus/mdio_bus/devices/mv88e6xxx-0:00/phy_id:0x01410eb1
> > /sys/bus/mdio_bus/devices/mv88e6xxx-0:01/phy_id:0x01410eb1
> > /sys/bus/mdio_bus/devices/mv88e6xxx-0:02/phy_id:0x01410eb1
> > /sys/bus/mdio_bus/devices/mv88e6xxx-0:03/phy_id:0x01410eb1
> > /sys/bus/mdio_bus/devices/mv88e6xxx-0:04/phy_id:0x01410eb1
> > /sys/bus/mdio_bus/devices/mv88e6xxx-0:0f/phy_id:0x01410ea1
>
> > and then look at the PHY IDs that the kernel uses in the drivers, and
> > thus will be used in the module's alias tables.
>
> > #define MARVELL_PHY_ID_88E1510 0x01410dd0
> > #define MARVELL_PHY_ID_88E1540 0x01410eb0
> > #define MARVELL_PHY_ID_88E1545 0x01410ea0
>
> > These numbers are different. This is not just one board. The last nibble
> > of the PHY ID is generally the PHY revision, but that is not universal.
> > See Atheros PHYs, where we match the entire ID except bit 4.
>
> > You can not "simplify" the "ugly" matching like this. It's the way it is
> > for good reason. Using the whole ID will _not_ cause a match, and your
> > change will cause a regression.
>
> On my platform, I can find following, stmmac-xx that is is mac name, it represent this platform has two mac
> controller, it isn't phy, but it's sub dir has phy id it is phy silicon id, and devices name is set by mdio bus,
> then, you said that "where we match the entire ID except bit 4." I think marvell it is special, and you can have
> look other phy,e.g. motorcomm phy, that phy mask is 0x00000fff or 0x0000ffff or ther, for different phy silicon,
> that phy maskit is not same, and that phy mask it isn't device property, you dont't get it from register, and mdio
> bus for phy register a device then mdiobus_scan will get phy id that phy id it is include all value, and don't has
> mask operation. then phy uevent must use phy_id that from phy register and that uevent doesn't include phy mask, if
> uevent add phy mask, then you need define a phy mask. if you have mature consideration, you will find that definition
> phy mask it isn't appropriate, if you define it in mac driver, because mac can select different phy, if you define it
> in dts, then phy driver is "of" type, mdio_uevent will doesn't be called. if you ask phy_id & phy_mask as a phy uevent,
> I think it is no make sense, e.g. 88e1512 and 88e1510 that has different "phy revision" so that phy silicon has difference,
> and uevent should be unique. If you have no other opinion on the above view, Back to this patch, that phy id of uevent
> need match phy alias configure, so alis configure must use phy id all value.
>
> In addition, Even if you hadn't consided what I said above, you need to know one thing, uevent match alias that must be full
> matching. not Partial matching. I said it a long time ago. why you think Binary digit and "?" can match dev uevent,
> according my code analysis and test analysis that any platform and any mdio phy device is all fail that be matched if that
> phy driver module and phy dev was use uevent-alias mechanism
>
> [root@localhost ~]# cat /sys/bus/mdio/devices/stmmac-19\:00/phy_id
> 0x01410dd1
> [root@localhost ~]#
> [root@localhost ~]# cat /sys/bus/mdio/devices/stmmac-18\:00/phy_id
> 0x01410dd1
> [root@localhost ~]#
>
> Thanks,
> BRs,
> Yinbo Zhu.
>
>
> include/linux/mod_devicetable.h | 2 ++
> scripts/mod/file2alias.c | 17 +----------------
> 2 files changed, 3 insertions(+), 16 deletions(-)
>
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index ae2e75d..7bd23bf 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -595,6 +595,8 @@ struct platform_device_id {
> kernel_ulong_t driver_data;
> };
>
> +#define MDIO_ANY_ID (~0)
> +
> #define MDIO_NAME_SIZE 32
> #define MDIO_MODULE_PREFIX "mdio:"
>
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 49aba86..63f3149 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -1027,24 +1027,9 @@ static int do_platform_entry(const char *filename,
> static int do_mdio_entry(const char *filename,
> void *symval, char *alias)
> {
> - int i;
> DEF_FIELD(symval, mdio_device_id, phy_id);
> - DEF_FIELD(symval, mdio_device_id, phy_id_mask);
> -
> alias += sprintf(alias, MDIO_MODULE_PREFIX);
> -
> - for (i = 0; i < 32; i++) {
> - if (!((phy_id_mask >> (31-i)) & 1))
> - *(alias++) = '?';
> - else if ((phy_id >> (31-i)) & 1)
> - *(alias++) = '1';
> - else
> - *(alias++) = '0';
> - }
> -
> - /* Terminate the string */
> - *alias = 0;
> -
> + ADD(alias, "p", phy_id != MDIO_ANY_ID, phy_id);
> return 1;
> }
>
> --
> 1.8.3.1
>
>

--
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