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SubjectRe: [PATCH 0/4] Sunxi: Add SMP support on A83T
Hello Corentin,

Le Fri, 15 Dec 2017 07:10:46 +0100,
Corentin Labbe <clabbe.montjoie@gmail.com> a écrit :
> On Tue, Dec 12, 2017 at 09:24:25AM +0100, Maxime Ripard wrote:
> > Hi,
> >
> > On Mon, Dec 11, 2017 at 08:35:34PM +0100, Corentin Labbe wrote:
> > > On Mon, Dec 11, 2017 at 08:49:57AM +0100, Mylène Josserand wrote:
> > > > This series adds SMP support for Allwinner Sun8i-a83t
> > > > with MCPM (Multi-Cluster Power Management).
> > > > Series information:
> > > > - Based on last linux-next (next-20171211)
> > > > - Had dependencies on Chen Yu's patch that add MCPM
> > > > support:
> > > > https://patchwork.kernel.org/patch/6402801/
> > > >
> > > > Patch 01: Convert the mcpm driver (initially for A80) to be able
> > > > to use it for A83T. This SoC has a bit flip that needs to be handled.
> > > > Patch 02: Add registers nodes (prcm, cpucfg and r_cpucfg) needed
> > > > for MCPM.
> > > > Patch 03: Add CCI-400 node for a83t.
> > > > Patch 04: Fix the use of virtual timers that hangs the kernel in
> > > > case of SMP support.
> > >
> > > As we discussed in private, Chen Yu's patch should be added in your series.
> >
> > Not really, she mentionned the dependency in the cover letter, and
> > it's a good way to do things too. Sure, you can do it your way, but
> > there's no preference.
> >
>
> If the goal of this series is to be applied, the dependency must be applied also.
> And since the dependency is 2 years old (and part of a serie which does not apply now), I think cherry picking the patch and send it for review is better.
>
> > > Furthermore, MCPM is not automaticaly selected via imply.
> >
> > Well, yes, is that an issue?
> >
>
> After reading the imply documentation, no.
>
> > > With all patchs I hit a bug:
> > > [ 0.898668] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238
> >
> > I guess this is with CONFIG_PROVE_LOCKING enabled?
> >
>
> No, the BUG() printed is enabled by default
>
> > > [ 0.911162] in_atomic(): 1, irqs_disabled(): 0, pid: 1, name: swapper/0
> > > [ 0.917776] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0-rc2-next-20171211+ #73
> >
> > What are the changes you've made?
> >
>
> Just adding wens's patch and this series.

I tried to reproduce your issue without success (even with
CONFIG_PROVE_LOCKING enabled, just in case).
Can you give me more details about your tests? which defconfig and
additional configurations?

>
> > > [ 0.925418] Hardware name: Allwinner sun8i Family
> > > [ 0.930118] Backtrace:
> > > [ 0.932596] [<c010cc50>] (dump_backtrace) from [<c010cf0c>] (show_stack+0x18/0x1c)
> > > [ 0.940158] r7:c0b261e4 r6:60000013 r5:00000000 r4:c0b51958
> > > [ 0.945820] [<c010cef4>] (show_stack) from [<c06baccc>] (dump_stack+0x8c/0xa0)
> > > [ 0.953045] [<c06bac40>] (dump_stack) from [<c0149d40>] (___might_sleep+0x150/0x170)
> > > [ 0.960779] r7:c0b261e4 r6:00000000 r5:000000ee r4:ee844000
> > > [ 0.966437] [<c0149bf0>] (___might_sleep) from [<c0149dc8>] (__might_sleep+0x68/0xa0)
> > > [ 0.974253] r4:c0861690
> > > [ 0.976796] [<c0149d60>] (__might_sleep) from [<c06d2918>] (mutex_lock+0x24/0x68)
> > > [ 0.984269] r6:c0892f6c r5:ffffffff r4:c0b1bb24
> > > [ 0.988891] [<c06d28f4>] (mutex_lock) from [<c01ccb6c>] (perf_pmu_register+0x24/0x3e4)
> > > [ 0.996795] r5:ffffffff r4:ee98b014
> > > [ 1.000375] [<c01ccb48>] (perf_pmu_register) from [<c03efabc>] (cci_pmu_probe+0x340/0x484)
> > > [ 1.008631] r10:c0892f6c r9:c0bfd5f0 r8:eea19010 r7:c0b261e4 r6:c0b26240 r5:eea19000
> > > [ 1.016447] r4:ee98b010
> > > [ 1.018989] [<c03ef77c>] (cci_pmu_probe) from [<c045e21c>] (platform_drv_probe+0x58/0xb8)
> > > [ 1.027158] r10:00000000 r9:c0b2610c r8:00000000 r7:fffffdfb r6:c0b2610c r5:ffffffed
> > > [ 1.034974] r4:eea19010
> > > [ 1.037511] [<c045e1c4>] (platform_drv_probe) from [<c045c984>] (driver_probe_device+0x254/0x330)
> > > [ 1.046371] r7:00000000 r6:c0bff498 r5:c0bff494 r4:eea19010
> > > [ 1.052026] [<c045c730>] (driver_probe_device) from [<c045cbc4>] (__device_attach_driver+0xa0/0xd4)
> > > [ 1.061062] r10:00000000 r9:c0bff470 r8:00000000 r7:00000001 r6:eea19010 r5:ee845ac0
> > > [ 1.068879] r4:c0b2610c r3:00000000
> > > [ 1.072454] [<c045cb24>] (__device_attach_driver) from [<c045ad68>] (bus_for_each_drv+0x68/0x9c)
> > > [ 1.081228] r7:00000001 r6:c045cb24 r5:ee845ac0 r4:00000000
> > > [ 1.086883] [<c045ad00>] (bus_for_each_drv) from [<c045c60c>] (__device_attach+0xb8/0x11c)
> > > [ 1.095135] r6:c0b3e848 r5:eea19044 r4:eea19010
> > > [ 1.099750] [<c045c554>] (__device_attach) from [<c045cc44>] (device_initial_probe+0x14/0x18)
> > > [ 1.108263] r7:c0b0a4c8 r6:c0b3e848 r5:eea19010 r4:eea19018
> > > [ 1.113919] [<c045cc30>] (device_initial_probe) from [<c045bb58>] (bus_probe_device+0x8c/0x94)
> > > [ 1.122523] [<c045bacc>] (bus_probe_device) from [<c0459db8>] (device_add+0x40c/0x5a0)
> > > [ 1.130429] r7:c0b0a4c8 r6:eea19010 r5:eea18a10 r4:eea19018
> > > [ 1.136089] [<c04599ac>] (device_add) from [<c0582a58>] (of_device_add+0x3c/0x44)
> > > [ 1.143564] r10:00000000 r9:00000000 r8:00000000 r7:eedf21a4 r6:eea18a10 r5:00000000
> > > [ 1.151380] r4:eea19000
> > > [ 1.153915] [<c0582a1c>] (of_device_add) from [<c0582f80>] (of_platform_device_create_pdata+0x7c/0xac)
> > > [ 1.163210] [<c0582f04>] (of_platform_device_create_pdata) from [<c0583100>] (of_platform_bus_create+0xf4/0x1f0)
> > > [ 1.173372] r9:00000000 r8:00000000 r7:00000001 r6:00000000 r5:eedf2154 r4:00000000
> > > [ 1.181107] [<c058300c>] (of_platform_bus_create) from [<c0583374>] (of_platform_populate+0x74/0xd4)
> > > [ 1.190229] r10:00000001 r9:eea18a10 r8:00000000 r7:00000000 r6:00000000 r5:eedf1d04
> > > [ 1.198045] r4:eedf2154
> > > [ 1.200580] [<c0583300>] (of_platform_populate) from [<c03ef2a8>] (cci_platform_probe+0x3c/0x54)
> > > [ 1.209356] r10:00000000 r9:c0b26168 r8:00000000 r7:fffffdfb r6:c0b26168 r5:ffffffed
> > > [ 1.217172] r4:eea18a00
> > > [ 1.219708] [<c03ef26c>] (cci_platform_probe) from [<c045e21c>] (platform_drv_probe+0x58/0xb8)
> > > [ 1.228306] r5:ffffffed r4:eea18a10
> > > [ 1.231881] [<c045e1c4>] (platform_drv_probe) from [<c045c984>] (driver_probe_device+0x254/0x330)
> > > [ 1.240742] r7:00000000 r6:c0bff498 r5:c0bff494 r4:eea18a10
> > > [ 1.246397] [<c045c730>] (driver_probe_device) from [<c045cbc4>] (__device_attach_driver+0xa0/0xd4)
> > > [ 1.255433] r10:00000000 r9:c0bff470 r8:00000000 r7:00000001 r6:eea18a10 r5:ee845ce8
> > > [ 1.263250] r4:c0b26168 r3:00000000
> > > [ 1.266825] [<c045cb24>] (__device_attach_driver) from [<c045ad68>] (bus_for_each_drv+0x68/0x9c)
> > > [ 1.275598] r7:00000001 r6:c045cb24 r5:ee845ce8 r4:00000000
> > > [ 1.281253] [<c045ad00>] (bus_for_each_drv) from [<c045c60c>] (__device_attach+0xb8/0x11c)
> > > [ 1.289506] r6:c0b3e848 r5:eea18a44 r4:eea18a10
> > > [ 1.294120] [<c045c554>] (__device_attach) from [<c045cc44>] (device_initial_probe+0x14/0x18)
> > > [ 1.302633] r7:c0b0a4c8 r6:c0b3e848 r5:eea18a10 r4:eea18a18
> > > [ 1.308288] [<c045cc30>] (device_initial_probe) from [<c045bb58>] (bus_probe_device+0x8c/0x94)
> > > [ 1.316890] [<c045bacc>] (bus_probe_device) from [<c0459db8>] (device_add+0x40c/0x5a0)
> > > [ 1.324796] r7:c0b0a4c8 r6:eea18a10 r5:ee993810 r4:eea18a18
> > > [ 1.330450] [<c04599ac>] (device_add) from [<c0582a58>] (of_device_add+0x3c/0x44)
> > > [ 1.337926] r10:00000000 r9:c07759d8 r8:00000000 r7:eedf1d54 r6:ee993810 r5:00000000
> > > [ 1.345743] r4:eea18a00
> > > [ 1.348277] [<c0582a1c>] (of_device_add) from [<c0582f80>] (of_platform_device_create_pdata+0x7c/0xac)
> > > [ 1.357572] [<c0582f04>] (of_platform_device_create_pdata) from [<c0583100>] (of_platform_bus_create+0xf4/0x1f0)
> > > [ 1.367734] r9:c07759d8 r8:00000000 r7:00000001 r6:00000000 r5:eedf1d04 r4:00000000
> > > [ 1.375469] [<c058300c>] (of_platform_bus_create) from [<c058315c>] (of_platform_bus_create+0x150/0x1f0)
> > > [ 1.384938] r10:ee993810 r9:c07759d8 r8:00000000 r7:00000001 r6:00000000 r5:eedefe1c
> > > [ 1.392754] r4:eedf1d04
> > > [ 1.395289] [<c058300c>] (of_platform_bus_create) from [<c0583374>] (of_platform_populate+0x74/0xd4)
> > > [ 1.404411] r10:00000001 r9:00000000 r8:00000000 r7:c07759d8 r6:00000000 r5:eedee844
> > > [ 1.412228] r4:eedefe1c
> > > [ 1.414769] [<c0583300>] (of_platform_populate) from [<c0a25ee8>] (of_platform_default_populate_init+0x80/0x94)
> > > [ 1.424844] r10:c0a37848 r9:00000000 r8:c0b59680 r7:c0a37834 r6:ffffe000 r5:c0775ce8
> > > [ 1.432661] r4:00000000
> > > [ 1.435200] [<c0a25e68>] (of_platform_default_populate_init) from [<c0102794>] (do_one_initcall+0x5c/0x194)
> > > [ 1.444925] r5:c0a25e68 r4:c0b0a4c8
> > > [ 1.448506] [<c0102738>] (do_one_initcall) from [<c0a00f88>] (kernel_init_freeable+0x1d4/0x268)
> > > [ 1.457195] r9:00000004 r8:c0b59680 r7:c0a37834 r6:c0b59680 r5:c0a47308 r4:c090cfb8
> > > [ 1.464932] [<c0a00db4>] (kernel_init_freeable) from [<c06cf3b0>] (kernel_init+0x10/0x118)
> > > [ 1.473187] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c06cf3a0
> > > [ 1.481004] r4:00000000
> > > [ 1.483540] [<c06cf3a0>] (kernel_init) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
> > > [ 1.491098] Exception stack(0xee845fb0 to 0xee845ff8)
> > > [ 1.496146] 5fa0: 00000000 00000000 00000000 00000000
> > > [ 1.504313] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> > > [ 1.512480] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> > > [ 1.519084] r5:c06cf3a0 r4:00000000
> > > [ 1.522737] ARM CCI_400_r1 PMU driver probed
> > >
> > > And only CPU 0 show up.
> >
> > This looks more like a bug in the CCI code, and not in this serie
> > itself. Can you share your whole boot logs?
> >
>
> This week end I will retry and send it.

By any chance, did you try it again? Can you reproduce it on your side?

Thank you in advance,

Best regards,

--
Mylène Josserand, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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