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

[Scott Wood]

On Sun, 2018-10-28 at 17:35 +0100, 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,in
> dex=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.

I wasn't able to reproduce this with top-of-tree (commit 8053e5b93eca9b) with
either qemu (e5500 on ppce500) or a hardware t4240.

-Scott