Re: [linux-sunxi] [PATCH v3 30/30] ARM: sun8i: a83t: full range OPP tables and CPUfreq

From: Philipp Rossak
Date: Thu Aug 30 2018 - 16:30:00 EST

On 30.08.2018 18:38, OndÅej Jirman wrote:
Hello,

On Thu, Aug 30, 2018 at 05:45:18PM +0200, Philipp Rossak wrote:
Since we have now thermal trotteling enabeled we can now add the full
range of the OPP table.

I'm not sure we can. I have a tablet with A83T SoC and it gets unstable
at these frequencies even with thermal throttling on mainline kernel. (Though
I have my own THS driver, but I doubt a different driver will change much.)

There might be some other issue left in the cpufreq code. I'll let others
test this on a better cooled boards though.

Did you/someone test this?

regards,
o.
I have a good cooled device, with big heatsinks and a fan blowing directly on it. But there is some big issue left!

cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
[ 85.076270] Unable to handle kernel paging request at virtual address 2e83c684
[ 85.083519] pgd = (ptrval)
[ 85.086220] [2e83c684] *pgd=00000000
[ 85.089813] Internal error: Oops: 5 [#3] SMP ARM
[ 85.094429] Modules linked in:
[ 85.097483] CPU: 4 PID: 127 Comm: sh Tainted: G D W 4.18.0-00031-g8f59917020b9-dirty #2
[ 85.106597] Hardware name: Allwinner A83t board
[ 85.111130] PC is at down_write+0x14/0x54
[ 85.115135] LR is at anon_vma_clone+0x9c/0x1e4
[ 85.119571] pc : [<c066a3d4>] lr : [<c01e71b8>] psr: 60000013
[ 85.125826] sp : ede45e70 ip : 000001a0 fp : eea3c690
[ 85.131041] r10: eea4193c r9 : 00400200 r8 : c0a942a4
[ 85.136255] r7 : 2e83c680 r6 : eea3aea0 r5 : eea3b220 r4 : 2e83c684
[ 85.142771] r3 : ffff0001 r2 : 2e83c680 r1 : ede45e58 r0 : 2e83c684
[ 85.149287] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 85.156410] Control: 10c5387d Table: 6df1806a DAC: 00000051
[ 85.162145] Process sh (pid: 127, stack limit = 0x(ptrval))
[ 85.167706] Stack: (0xede45e70 to 0xede46000)
[ 85.172057] 5e60: eea3b900 c01e71b8 eea41900 ffebd684
[ 85.180221] 5e80: c0a637b0 c07ea07c c0a10754 eea3aea0 eea41900 c0a04c48 edd71880 00000000
[ 85.188385] 5ea0: eea3aea0 eea41900 c0a69030 c01e7324 00000002 edd701c0 c0a04c48 edd71880
[ 85.196548] 5ec0: 00000000 c011c2f4 00000069 00000000 00000002 00000000 00000000 00000000
[ 85.204711] 5ee0: 00000000 edd701c0 edd82280 eea3af00 edd701f8 edd718b8 eea3af08 eea3af14
[ 85.212875] 5f00: eea3af10 ede44000 edd8255c 01200011 00000000 ede45f14 ede45f14 b61ea11a
[ 85.221039] 5f20: edd805c0 01200011 c0a04c48 beef38b0 00000000 00000000 00000000 00000078
[ 85.229202] 5f40: beef38dc c011ce0c 00000000 00000000 00000000 ede44000 000000ae c012d9e0
[ 85.237365] 5f60: eea43480 00000000 04000000 b61ea11a 00000000 b6fb5068 b6f8b670 beef38b0
[ 85.245529] 5f80: 00000078 c0101204 ede44000 00000078 beef38dc c011d1bc b6fb5068 00000000
[ 85.253692] 5fa0: 000000ae c0101000 b6fb5068 b6f8b670 01200011 00000000 00000000 00000000
[ 85.261856] 5fc0: b6fb5068 b6f8b670 beef38b0 00000078 b6f8ac4c b6fb5490 ffffffff beef38dc
[ 85.270020] 5fe0: 00000002 beef38b0 00000000 b6f5bfd0 60000010 01200011 00000000 00000000
[ 85.278191] [<c066a3d4>] (down_write) from [<c01e71b8>] (anon_vma_clone+0x9c/0x1e4)
[ 85.285836] [<c01e71b8>] (anon_vma_clone) from [<c01e7324>] (anon_vma_fork+0x24/0x160)
[ 85.293741] [<c01e7324>] (anon_vma_fork) from [<c011c2f4>] (copy_process.part.3+0xbc4/0x158c)
[ 85.302253] [<c011c2f4>] (copy_process.part.3) from [<c011ce0c>] (_do_fork+0xb0/0x394)
[ 85.310157] [<c011ce0c>] (_do_fork) from [<c011d1bc>] (sys_clone+0x20/0x28)
[ 85.317107] [<c011d1bc>] (sys_clone) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 85.324661] Exception stack(0xede45fa8 to 0xede45ff0)
[ 85.329704] 5fa0: b6fb5068 b6f8b670 01200011 00000000 00000000 00000000
[ 85.337868] 5fc0: b6fb5068 b6f8b670 beef38b0 00000078 b6f8ac4c b6fb5490 ffffffff beef38dc
[ 85.346021] 5fe0: 00000002 beef38b0 00000000 b6f5bfd0
[ 85.351068] Code: e1a04000 f590f000 e3a03001 e34f3fff (e1902f9f)
[ 85.357200] ---[ end trace aad10e0b4fcbf194 ]---


OR

cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
[ 73.873939] ------------[ cut here ]------------
[ 73.878584] WARNING: CPU: 5 PID: 132 at mm/rmap.c:235 unlink_anon_vmas+0x1f4/0x1fc
[ 73.886210] Modules linked in:
[ 73.889276] CPU: 5 PID: 132 Comm: sh Tainted: G D 4.18.0-00031-g8f59917020b9-dirty #2
[ 73.898391] Hardware name: Allwinner A83t board
[ 73.902934] [<c010f310>] (unwind_backtrace) from [<c010bd54>] (show_stack+0x10/0x14)
[ 73.910671] [<c010bd54>] (show_stack) from [<c0652f98>] (dump_stack+0x84/0x98)
[ 73.917887] [<c0652f98>] (dump_stack) from [<c011dd14>] (__warn+0xfc/0x114)
[ 73.924840] [<c011dd14>] (__warn) from [<c011de44>] (warn_slowpath_null+0x40/0x48)
[ 73.932398] [<c011de44>] (warn_slowpath_null) from [<c01e7114>] (unlink_anon_vmas+0x1f4/0x1fc)
[ 73.941006] [<c01e7114>] (unlink_anon_vmas) from [<c01da874>] (free_pgtables+0x78/0xcc)
[ 73.948999] [<c01da874>] (free_pgtables) from [<c01e1e88>] (exit_mmap+0xe4/0x188)
[ 73.956471] [<c01e1e88>] (exit_mmap) from [<c011b3a8>] (mmput+0x40/0xf0)
[ 73.963169] [<c011b3a8>] (mmput) from [<c0208f1c>] (flush_old_exec+0x550/0x6e0)
[ 73.970473] [<c0208f1c>] (flush_old_exec) from [<c0250e74>] (load_elf_binary+0x2f0/0x1324)
[ 73.978726] [<c0250e74>] (load_elf_binary) from [<c02086c4>] (search_binary_handler+0xa0/0x234)
[ 73.987412] [<c02086c4>] (search_binary_handler) from [<c02098b0>] (__do_execve_file+0x57c/0x6bc)
[ 73.996271] [<c02098b0>] (__do_execve_file) from [<c0209c54>] (sys_execve+0x34/0x3c)
[ 74.004003] [<c0209c54>] (sys_execve) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 74.011645] Exception stack(0xede71fa8 to 0xede71ff0)
[ 74.016690] 1fa0: 000c530c 000c52d0 000c530c 000c52d0 000c52dc 00000000
[ 74.024853] 1fc0: 000c530c 000c52d0 000a2a0c 0000000b 000c52dc 000c4b5c 000c4b5c 000c530c
[ 74.033016] 1fe0: b6f25ed4 beef38b8 00042038 b6f25ee0
[ 74.038086] ---[ end trace aad10e0b4fcbf192 ]---
[ 74.042726] Unable to handle kernel paging request at virtual address 2e83c684
[ 74.049958] pgd = (ptrval)
[ 74.052665] [2e83c684] *pgd=00000000
[ 74.056243] Internal error: Oops: 5 [#2] SMP ARM
[ 74.060851] Modules linked in:
[ 74.063904] CPU: 5 PID: 132 Comm: sh Tainted: G D W 4.18.0-00031-g8f59917020b9-dirty #2
[ 74.073019] Hardware name: Allwinner A83t board
[ 74.077548] PC is at down_write+0x14/0x54
[ 74.081553] LR is at unlink_anon_vmas+0xa8/0x1fc
[ 74.086160] pc : [<c066a3d4>] lr : [<c01e6fc8>] psr: 60000013
[ 74.092416] sp : ede71d88 ip : 00000000 fp : eea3b680
[ 74.097630] r10: eea3c690 r9 : c0a637b0 r8 : eea41e40
[ 74.102845] r7 : c0a942a4 r6 : 2e83c680 r5 : eea41e7c r4 : 2e83c684
[ 74.109360] r3 : ffff0001 r2 : ffff0001 r1 : 00000000 r0 : 2e83c684
[ 74.115878] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 74.123000] Control: 10c5387d Table: 6de6406a DAC: 00000051
[ 74.128735] Process sh (pid: 132, stack limit = 0x(ptrval))
[ 74.134296] Stack: (0xede71d88 to 0xede72000)
[ 74.138645] 1d80: eea41e74 c01e6fc8 c07ea07c eea3c690 eea41f00 eea41e40
[ 74.146809] 1da0: eea41d20 b6f17000 ede71df4 00002000 00000000 edd9c300 ede71e90 c01da874
[ 74.154973] 1dc0: b6f17000 c01dbf94 00000000 eea41360 00000000 c0a04c48 edd716c0 edd826b0
[ 74.163136] 1de0: edd90540 c01e1e88 eeabc6c8 00000001 00000000 edd716c0 00000001 00000000
[ 74.171299] 1e00: 00000000 ffffffff c0a68f40 00000000 000000ac 00000400 eeacf000 eeb9f038
[ 74.179463] 1e20: 00000100 b61ea11a 00000000 edd716c0 00000000 edda8540 edd716c0 b61ea11a
[ 74.187627] 1e40: edd716c0 00000000 edda8540 c011b3a8 edd716c0 edd82280 edda8540 c0208f1c
[ 74.195790] 1e60: 000000a0 c024f610 000000d4 c0a04c48 eeab4100 00000000 edd9c300 eeab4134
[ 74.203954] 1e80: eeabc6c0 edd9c400 ede71e90 c0250e74 effcec80 effcec80 00000001 eeabc6c0
[ 74.212118] 1ea0: eeaab180 eeabb000 00000000 c01d9704 effcec80 80000013 beffff22 00000000
[ 74.220281] 1ec0: ede70000 effcec80 edd9c300 c01d9344 00000000 00000004 beffff22 00000000
[ 74.228445] 1ee0: 00000034 00000000 00000011 ede71f20 00000000 00000000 00000051 b61ea11a
[ 74.236609] 1f00: befff000 c0a1130c edd9c300 c0a9558c fffffff8 c0a10e3c c0a9558c c07ebbb4
[ 74.244772] 1f20: 00000001 c02086c4 c0a0bbd4 c0a04c48 edda2000 ffffe000 00000084 edd9c300
[ 74.252936] 1f40: 00000001 00000000 00000000 c02098b0 c0a04f34 edda8540 eeab8de0 edda8578
[ 74.261100] 1f60: 00000000 b61ea11a 000c530c 000c52d0 000c52dc 000a2a0c 0000000b c0101204
[ 74.269263] 1f80: ede70000 0000000b 000c530c c0209c54 00000000 00000000 20000010 000c530c
[ 74.277428] 1fa0: 000c52d0 c0101000 000c530c 000c52d0 000c530c 000c52d0 000c52dc 00000000
[ 74.285592] 1fc0: 000c530c 000c52d0 000a2a0c 0000000b 000c52dc 000c4b5c 000c4b5c 000c530c
[ 74.293755] 1fe0: b6f25ed4 beef38b8 00042038 b6f25ee0 a0000010 000c530c 00000000 00000000
[ 74.301924] [<c066a3d4>] (down_write) from [<c01e6fc8>] (unlink_anon_vmas+0xa8/0x1fc)
[ 74.309743] [<c01e6fc8>] (unlink_anon_vmas) from [<c01da874>] (free_pgtables+0x78/0xcc)
[ 74.317733] [<c01da874>] (free_pgtables) from [<c01e1e88>] (exit_mmap+0xe4/0x188)
[ 74.325204] [<c01e1e88>] (exit_mmap) from [<c011b3a8>] (mmput+0x40/0xf0)
[ 74.331898] [<c011b3a8>] (mmput) from [<c0208f1c>] (flush_old_exec+0x550/0x6e0)
[ 74.339195] [<c0208f1c>] (flush_old_exec) from [<c0250e74>] (load_elf_binary+0x2f0/0x1324)
[ 74.347447] [<c0250e74>] (load_elf_binary) from [<c02086c4>] (search_binary_handler+0xa0/0x234)
[ 74.356134] [<c02086c4>] (search_binary_handler) from [<c02098b0>] (__do_execve_file+0x57c/0x6bc)
[ 74.364993] [<c02098b0>] (__do_execve_file) from [<c0209c54>] (sys_execve+0x34/0x3c)
[ 74.372724] [<c0209c54>] (sys_execve) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 74.380365] Exception stack(0xede71fa8 to 0xede71ff0)
[ 74.385407] 1fa0: 000c530c 000c52d0 000c530c 000c52d0 000c52dc 00000000
[ 74.393571] 1fc0: 000c530c 000c52d0 000a2a0c 0000000b 000c52dc 000c4b5c 000c4b5c 000c530c
[ 74.401733] 1fe0: b6f25ed4 beef38b8 00042038 b6f25ee0
[ 74.406778] Code: e1a04000 f590f000 e3a03001 e34f3fff (e1902f9f)
[ 74.412895] ---[ end trace aad10e0b4fcbf193 ]---

I think I will drop this patch until this issue is fixed.

Philipp