NXP P50XX/e5500: SMP doesn't work anymore with the latest Git kernel

[Christian Zigotzky <chzigotzky@xenosoft.de>]

Little progress ...

I reverted the following two OF files of the commit 'Merge tag 
devicetree-for-4.20' and SMP works! The problematic code is somewhere in 
these two files.

a/include/linux/of.h
a/drivers/of/base.c

-- Christian


On 29 October 2018 at 6:00PM, Christian Zigotzky wrote:
> Hello,
>
> I figured out that the problem is in the OF source code of the commit: 
> Merge tag devicetree-for-4.20. [1]
>
> I reverted the following OF files and SMP works!
>
> drivers/of/base.c
> drivers/of/device.c
> drivers/of/of_mdio.c
> drivers/of/of_numa.c
> drivers/of/of_private.h
> drivers/of/overlay.c
> drivers/of/platform.c
> drivers/of/unittest-data/overlay_15.dts
> drivers/of/unittest-data/tests-overlay.dtsi
> drivers/of/unittest.c
> include/linux/of.h
>
> Cheers,
> Christian
>
> [1] 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b27186abb37b7bd19e0ca434f4f425c807dbd708
>
>
> On 29 October 2018 at 10:56AM, Christian Zigotzky wrote:
>> Hello,
>>
>> I have figured out that the commit 'devicetree-for-4.20' [1] is 
>> responsible for the SMP problem. I was able to revert this commit 
>> with 'git revert b27186abb37b7bd19e0ca434f4f425c807dbd708 -m 1' today.
>>
>> [master ec81438] Revert "Merge tag 'devicetree-for-4.20' of 
>> git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux"
>> 138 files changed, 931 insertions(+), 1538 deletions(-)
>> rename Documentation/devicetree/bindings/arm/{atmel-sysregs.txt => 
>> atmel-at91.txt} (67%)
>> delete mode 100644 
>> Documentation/devicetree/bindings/arm/freescale/fsl,layerscape-dcfg.txt
>> delete mode 100644 
>> Documentation/devicetree/bindings/arm/freescale/fsl,layerscape-scfg.txt
>> rename Documentation/devicetree/bindings/arm/{zte,sysctrl.txt => 
>> zte.txt} (62%)
>> delete mode 100644 Documentation/devicetree/bindings/misc/lwn-bk4.txt
>> create mode 100644 arch/c6x/boot/dts/linked_dtb.S
>> delete mode 100644 arch/nios2/boot/dts/Makefile
>> create mode 100644 arch/nios2/boot/linked_dtb.S
>> delete mode 100644 arch/powerpc/boot/dts/Makefile
>> delete mode 100644 arch/powerpc/boot/dts/fsl/Makefile
>> delete mode 100644 scripts/dtc/yamltree.c
>>
>> It solves the SMP problem! SMP works again on my P5020 board and on 
>> virtual e5500 QEMU machines.
>>
>> QEMU command: ./qemu-system-ppc64 -M ppce500 -cpu e5500 -m 2048 
>> -kernel /home/christian/Downloads/uImage-4.20-alpha5 -drive 
>> format=raw,file=/home/christian/Dokumente/ubuntu_MATE_16.04.3_LTS_PowerPC_QEMU/ubuntu_MATE_16.04_PowerPC.img,index=0,if=virtio 
>> -nic user,model=e1000 -append "rw root=/dev/vda3" -device virtio-vga 
>> -device virtio-mouse-pci -device virtio-keyboard-pci -soundhw es1370 
>> -smp 4
>>
>> Screenshot: 
>> https://plus.google.com/u/0/photos/photo/115515624056477014971/6617705776207990082
>>
>> Do we need a new dtb file or is it a bug?
>>
>> Thanks,
>> Christian
>>
>> [1] 
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b27186abb37b7bd19e0ca434f4f425c807dbd708
>>
>>
>> On 28 October 2018 at 5:35PM, Christian Zigotzky wrote:
>>> Hello,
>>>
>>> SMP doesn't work anymore with the latest Git kernel (28/10/18 
>>> 11:12AM GMT) on my P5020 board and on virtual e5500 QEMU machines.
>>>
>>> Board with P5020 dual core CPU:
>>>
>>> [    0.000000] -----------------------------------------------------
>>> [    0.000000] phys_mem_size     = 0x200000000
>>> [    0.000000] dcache_bsize      = 0x40
>>> [    0.000000] icache_bsize      = 0x40
>>> [    0.000000] cpu_features      = 0x00000003008003b4
>>> [    0.000000]   possible        = 0x00000003009003b4
>>> [    0.000000]   always          = 0x00000003008003b4
>>> [    0.000000] cpu_user_features = 0xcc008000 0x08000000
>>> [    0.000000] mmu_features      = 0x000a0010
>>> [    0.000000] firmware_features = 0x0000000000000000
>>> [    0.000000] -----------------------------------------------------
>>> [    0.000000] CoreNet Generic board
>>>
>>>     ...
>>>
>>> [    0.002161] smp: Bringing up secondary CPUs ...
>>> [    0.002339] No cpu-release-addr for cpu 1
>>> [    0.002347] smp: failed starting cpu 1 (rc -2)
>>> [    0.002401] smp: Brought up 1 node, 1 CPU
>>>
>>> Virtual e5500 quad core QEMU machine:
>>>
>>> [    0.026394] smp: Bringing up secondary CPUs ...
>>> [    0.027831] No cpu-release-addr for cpu 1
>>> [    0.027989] smp: failed starting cpu 1 (rc -2)
>>> [    0.030143] No cpu-release-addr for cpu 2
>>> [    0.030304] smp: failed starting cpu 2 (rc -2)
>>> [    0.032400] No cpu-release-addr for cpu 3
>>> [    0.032533] smp: failed starting cpu 3 (rc -2)
>>> [    0.033117] smp: Brought up 1 node, 1 CPU
>>>
>>> QEMU command: ./qemu-system-ppc64 -M ppce500 -cpu e5500 -m 2048 
>>> -kernel 
>>> /home/christian/Downloads/vmlinux-4.20-alpha4-AmigaOne_X1000_X5000/X5000_and_QEMU_e5500/uImage-4.20 
>>> -drive 
>>> format=raw,file=/home/christian/Downloads/MATE_PowerPC_Remix_2017_0.9.img,index=0,if=virtio 
>>> -nic user,model=e1000 -append "rw root=/dev/vda" -device virtio-vga 
>>> -device virtio-mouse-pci -device virtio-keyboard-pci -usb -soundhw 
>>> es1370 -smp 4
>>>
>>> .config:
>>>
>>> ...
>>> CONFIG_SMP=y
>>> CONFIG_NR_CPUS=4
>>> ...
>>>
>>> Please test the latest Git kernel on your NXP P50XX boards.
>>>
>>> Thanks,
>>> Christian
>>>
>>
>>
>
>