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Date:   Mon, 08 Aug 2022 12:55:15 +0200
From:   Michael Walle <michael@walle.cc>
To:     Daniel Lezcano <daniel.lezcano@linaro.org>
Cc:     abailon@baylibre.com, anarsoul@gmail.com, baolin.wang7@gmail.com,
        bjorn.andersson@linaro.org, broonie@kernel.org,
        damien.lemoal@opensource.wdc.com, digetx@gmail.com,
        f.fainelli@gmail.com, glaroque@baylibre.com,
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        rafael@kernel.org, rui.zhang@intel.com, shawnguo@kernel.org,
        talel@amazon.com, thierry.reding@gmail.com, tiny.windzz@gmail.com,
        Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v5 00/33] New thermal OF code
In-Reply-To: <9b6aea8b-23fb-a882-4c47-5cd70cf266bf@linaro.org>
References: <20220804224349.1926752-1-daniel.lezcano@linexp.org>
 <20220808094216.928018-1-michael@walle.cc>
 <9b6aea8b-23fb-a882-4c47-5cd70cf266bf@linaro.org>
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Hi Daniel,

Am 2022-08-08 12:21, schrieb Daniel Lezcano:
> On 08/08/2022 11:42, Michael Walle wrote:
>>> The following changes are depending on:
>>> 
>>>   - 20220722200007.1839356-1-daniel.lezcano@linexp.org
>>> 
>>> which are present in the thermal/linux-next branch:
>>> 
>>> https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git/log/?h=thermal/linux-next
>>> 
>>> The series introduces a new thermal OF code. The patch description 
>>> gives
>>> a detailed explanation of the changes. Basically we write new OF 
>>> parsing
>>> functions, we migrate all the users of the old thermal OF API to the 
>>> new
>>> one and then we finish by removing the old OF code.
>>> 
>>> That is the second step to rework the thermal OF code. More patches 
>>> will
>>> come after that to remove the duplication of the trip definitions in 
>>> the
>>> different drivers which will result in more code duplication removed 
>>> and
>>> consolidation of the core thermal framework.
>>> 
>>> Thanks for those who tested the series on their platform and
>>> investigated the regression with the disabled by default thermal 
>>> zones.
>> I haven't looked closely yet, but this series is breaking two of my
>> boards.
>> 
>> There seems to be one mistake within the new thermal code:
>> 
>> [    2.030452] thermal_sys: Failed to find 'trips' node
>> [    2.033664] usb 1-1: new high-speed USB device number 2 using 
>> xhci-hcd
>> [    2.035434] thermal_sys: Failed to find trip points for tmu id=2
>> [    2.048010] qoriq_thermal 1f80000.tmu: Failed to register sensors
>> [    2.054128] qoriq_thermal: probe of 1f80000.tmu failed with error 
>> -22
>> [    2.060607] devm_thermal_of_zone_release:707 res=ffff002002377180
>> [    2.067044] Unable to handle kernel paging request at virtual 
>> address 01adadadadadad88
>> [    2.075003] Mem abort info:
>> [    2.077805]   ESR = 0x0000000096000004
>> [    2.081562]   EC = 0x25: DABT (current EL), IL = 32 bits
>> [    2.086893]   SET = 0, FnV = 0
>> [    2.089955]   EA = 0, S1PTW = 0
>> [    2.093100]   FSC = 0x04: level 0 translation fault
>> [    2.097993] Data abort info:
>> [    2.100876]   ISV = 0, ISS = 0x00000004
>> [    2.104724]   CM = 0, WnR = 0
>> [    2.107698] [01adadadadadad88] address between user and kernel 
>> address ranges
>> [    2.114863] Internal error: Oops: 96000004 [#1] SMP
>> [    2.119754] Modules linked in:
>> [    2.122815] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 
>> 5.19.0-next-20220808-00078-ga957a15f74fc-dirty #1694
>> [    2.132504] Hardware name: Kontron KBox A-230-LS (DT)
>> [    2.137568] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS 
>> BTYPE=--)
>> [    2.144554] pc : kfree+0x5c/0x3c0
>> [    2.147885] lr : thermal_of_zone_unregister+0x34/0x54
>> [    2.152954] sp : ffff80000a22bab0
>> [    2.156274] x29: ffff80000a22bab0 x28: 0000000000000000 x27: 
>> ffff800009960464
>> [    2.163438] x26: ffff800009a16960 x25: 0000000000000006 x24: 
>> ffff800009f09a40
>> [    2.170601] x23: ffff800009ab9008 x22: ffff800008d0d684 x21: 
>> 01adadadadadad80
>> [    2.177763] x20: 6b6b6b6b6b6b6b6b x19: ffff002002335000 x18: 
>> 00000000fffffffb
>> [    2.184925] x17: ffff800008d0d67c x16: ffff800008d072b4 x15: 
>> ffff800008d0c6c4
>> [    2.192087] x14: ffff800008d0c34c x13: ffff8000088d5034 x12: 
>> ffff8000088d46d4
>> [    2.199248] x11: ffff8000088d4624 x10: 0000000000000000 x9 : 
>> ffff800008d0d684
>> [    2.206410] x8 : ffff002000b1a158 x7 : bbbbbbbbbbbbbbbb x6 : 
>> ffff80000a0f53b8
>> [    2.213572] x5 : ffff80000a22b940 x4 : 0000000000000000 x3 : 
>> 0000000000000000
>> [    2.220733] x2 : fffffc0000000000 x1 : ffff002000838040 x0 : 
>> 01adb1adadadad80
>> [    2.227895] Call trace:
>> [    2.230342]  kfree+0x5c/0x3c0
>> [    2.233318]  thermal_of_zone_unregister+0x34/0x54
>> [    2.238036]  devm_thermal_of_zone_release+0x44/0x54
>> [    2.242931]  release_nodes+0x64/0xd0
>> [    2.246516]  devres_release_all+0xbc/0x350
>> [    2.250623]  device_unbind_cleanup+0x20/0x70
>> [    2.254905]  really_probe+0x1a0/0x2e4
>> [    2.258577]  __driver_probe_device+0x80/0xec
>> [    2.262859]  driver_probe_device+0x44/0x130
>> [    2.267055]  __driver_attach+0x104/0x1b4
>> [    2.270989]  bus_for_each_dev+0x7c/0xe0
>> [    2.274834]  driver_attach+0x30/0x40
>> [    2.278418]  bus_add_driver+0x160/0x210
>> [    2.281900] hub 1-1:1.0: USB hub found
>> [    2.282264]  driver_register+0x84/0x140
>> [    2.286109] hub 1-1:1.0: 7 ports detected
>> [    2.289859]  __platform_driver_register+0x34/0x40
>> [    2.289867]  qoriq_tmu_init+0x28/0x34
>> [    2.302258]  do_one_initcall+0x50/0x250
>> [    2.306104]  kernel_init_freeable+0x278/0x31c
>> [    2.310474]  kernel_init+0x30/0x140
>> [    2.313972]  ret_from_fork+0x10/0x20
>> [    2.317559] Code: b25657e2 d34cfc00 d37ae400 8b020015 (f94006a1)
>> [    2.323672] ---[ end trace 0000000000000000 ]---
>> [    2.328317] Kernel panic - not syncing: Attempted to kill init! 
>> exitcode=0x0000000b
>> [    2.335999] SMP: stopping secondary CPUs
>> [    2.339932] Kernel Offset: disabled
>> [    2.343425] CPU features: 0x2000,0800f021,00001086
>> [    2.348229] Memory Limit: none
>> [    2.351289] ---[ end Kernel panic - not syncing: Attempted to kill 
>> init! exitcode=0x0000000b ]---
>> 
>> This was seen a sl28 board
>> (arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-kbox-a-230-ls.dts).
>> The same board in the KernelCI also have some more information:
>> https://lavalab.kontron.com/scheduler/job/151900#L1162
>> 
>> But I guess even if that is fixed, the driver will not probe due to 
>> the
>> missing trip points? Are they now mandatory? Does it mean we'd need to
>> update our device trees? But that will then mean older devices trees
>> don't work anymore.
> 
> Thanks for reporting, I'll investigate the issues you are reporting.
> 
> There is no need to update any device tree file. The code does not
> change the bindings, it is a rewrite of the implementation supposed to
> be without impact on the existing bindings, thus the existing device
> tree descriptions.
> 
> Why are you saying there are missing trip points ? The dts shows trip
> points for 'core-cluster' and 'ddr-controller' ?

You are right. I've just looked at the error message:

[    2.030452] thermal_sys: Failed to find 'trips' node
[    2.033664] usb 1-1: new high-speed USB device number 2 using 
xhci-hcd
[    2.035434] thermal_sys: Failed to find trip points for tmu id=2

So maybe the code just don't find em.

-michael