Re: [PATCH 0/4] Sunxi: Add SMP support on A83T

[Mylene JOSSERAND]

Hi,

Le Mon, 11 Dec 2017 20:35:34 +0100,
Corentin Labbe <clabbe.montjoie@xxxxxxxxx> a Ãcrit :
> On Mon, Dec 11, 2017 at 08:49:57AM +0100, MylÃne Josserand wrote:
> > Hello everyone,
> > 
> > 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.
> > 
> > If you have any remarks/questions, let me know.
> > Thank you in advance,
> > MylÃne
> >   
> 
> Hello
> 
> As we discussed in private, Chen Yu's patch should be added in your
> series.
> 
> Furthermore, MCPM is not automaticaly selected via imply.
> 
> With all patchs I hit a bug:
> [    0.898668] BUG: sleeping function called from invalid context at
> kernel/locking/mutex.c:238 [    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
> [    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

I have done further tests.

I booted a previous kernel that I know it was working fine (kernel
v4.13) then, I booted the kernel with this series and it worked just
fine.

Only after a power cycle, I am able to reproduce the error, otherwise,
it is working well. See the boot log of this two tests:
http://code.bulix.org/7kr0e0-239697?raw

So I really tested this series but I did not do any power-cycle between
my tests (only reboots). I will investigate on it.

Best regards,

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