Kexec on arm64

[mark.rutland@arm.com (Mark Rutland)]

[...]

> 2) Rebooting
> #########################
> # kexec -e
> kexec version: 1kvm: exiting hardware virtualization
> 4.07.17.12.17-gbStarting new kernel
> 6cccb4
>  Ump_spin_tanblaeb_lcpeu_d ite:127: oi dh:a n7d,l holding count: 0e
>  kernel NULL pointer dereference at virtual address 00000291
> smp_spin_Itnaibtlei_cpaul_diie:12z7:i nigd :c 3g,r oholding couunpt :s 0u

Hmm. This looks like two threads/CPUs are outputting characters at the
same time, something like "smp_spin_table_die" and "Initial cpu" seem to
be interspersed.

Mark.

> bsys cpu
> smpL_isnpuixn _table_cpu_diev:e1r2s7i:o ni d: 6, hol3d.i1n6g. 0c-orucnt: 0
> 4+ (arun at arun-OptiPlex-9010) (gcc version 4.9.1 20140505 (prerelease)
> (crosstool-NG linaro-1.13.1-4.9-2014.05 - Linaro GCC 4.9-2014.05) )
> #25 SMP smp_sPpin_tablReE_EcMpPuT_ dTie:127: iude:  J5u, hlo ld2ing
> coun2:
> 37:03 IST 2014
> smp_Cspin_tPabUl:e _AcApruc_die:127: id: h46,4  hPorldiong count:c e0s
>  or [500f0000] revision 0
> smp_speifni_:t aGbeltet_cpu_die:i1n2g7 : ipd:a 2, holdinrga mceount:t e0
> rs from FDT:
> smep_fsip:i nC_atable_cpu_dien:'1t27: i df: 1i, holdinngd  cSoyusntt:e 0
> m Table in device tree!
> macchimne_kexaec:: 572C: smp_pMrAo:c efsasiorl_ied = 0
> d to reserve 16 MiB
> dachine_kexecO:n5 7n4o:
>  e 0 totalpages: 4194304
> a k e xec image inNfoor:m
>  l zone: 57344 pages used for memmap
>     type:        0
> z   sta r tN:o     r  m4a0000800l04
>  one: 4194304 pages, LIFO batch:31
>     head:   P E R   43Cea9bPf002
> U: Embedded 11 pages/cpu @ffffffc3fff7d000 s13120 r8192 d23744 u45056
>     nrp_cspeug-maelnltosc: 2
> : s13120 r8192 d23744 u45056 alloc=11*4096
>    p c p usegment-[a0l]l:o c0:0 0[0000400]00 800 000[ -0 ]0000004000
> 881c 0[000],  280c000h bytes,  [200]6 0 3pages
>  [0] 4 [0] 5 [0] 6 [0] 7
> eexBeuc_is_dtb:1i1l5:t  m1a gizc: 0 : 0 : noon
>  lists in Zone order, mobility grouping on.  Total pages: 4136960
> /  K e r segment[1]: n0e0l0 00c0o400m08a0000 m-a n0d00
> 00040l008ai30n00e,:  3r000ho obty=tes, 3/ dpeagesv
>  nfs rw nfsroot=10.162.103.228:/nfs_root/dora_june_6/apm-image-minimal-mustangbe
> ip=10.162.103.21:10.162.103.228:10.162.103.1:255.255.255.0:mustangk:eextehc_0is:_odtb:1f15f:
>  pmaangic:i 0c =: 0 : 1no
> console=ttyS0,115200 earlyprintk=uart8250-32bit,0x1c020000 debug
> maxcpus=8 swiotlb=65536 log_buf_len=1M
> 8aclhinoeg_kex_ec:582: cobnturfo_ll_ecode_page:        nf:f f1ff0fbc4edb67ee8
>  576
> 6achinee_akrelxyec: 58l4: reobogo tb_ucfo dfe_buffer_physr:e e :0
> 000010435eaffb00007
>  (92%)
> macPhine_IkDexec:58 6h:a srehb otot_acode_bufferb:l e   e n t
> rfifffffce3se:a f4f0b000
> 96 (order: 3, 32768 bytes)
> macDhine_kexeecn:t5r88: ryel occate_neaw_ckheer nelh:a s     fffffhf
> c0t0a0093b18
> ble entries: 2097152 (order: 12, 16777216 bytes)
> machineI_kneoxedc:5e90-: relocate_cnaecwh_ek ehransel_size: b8hh( 1t84)a bytes
> ble entries: 1048576 (order: 11, 8388608 bytes)
> machinMe_keemxoercy::5 913: kexec6_5d0t8b_6addr2:4 K
> 0/0100004600708a0000
> 77216K available (4360K kernel code, 299K rwdata, 1528K rodata, 6556K
> init, 202K bss, 268592K reserved)
> oacVhinei_kretxueacl: 595: kexec_kkeirmnaegle _mhead:     e m o r0y0
> 00l0043eaa9bf002y
>  ut:
>     vmalloc : 0xffffff8000000000 - 0xffffffbbffff0000   (245759 MB)
>     vmemmap : 0xffffffbce0000000 - 0xffffffbcee000000   (   224 MB)
> 0  machine_ kmeoxdecu:l597:e kexecs_ k:i m0age_xsftarft:    f  f
> f0f0b0f0f0c04000080004
>  00000 - 0xffffffc000000000   (    64 MB)
>     memory  : 0xffffffc000000000 - 0xffffffc400000000   ( 16384 MB)
>       .init : 0xffffffc000642000 -machine_ke x0excf:f5f99:f
> kexec_efntfrcy0_0d0ump:
> ca9340   (  6557 kB)
>       .text : 0xffffffc000080000 - 0xffffffc0006411c4   (  5893 kB)
> f     .data : 0xffffffc000caa000 - 0xffffffc000cf4f28     (I
> 43ea9bf002 =  343ea9b0f000 (f0fffffc 3ekaB9)b
>  000)
> d D 40S0LU00B8:0 0H0W1 = a4000080000l i(gfnf=f6f4ffc,00008000 0O)r
> ######################
> 
> This doesn't seems to be working. Random behaviors are observed. Some
> times it rebooted to u-boot
> prompt. Sometimes kernel soft resets itself in an endless loop
> (bootlog is repeating over and over again)
> 
> To debug what is happening I put a while(1) just before jumping into
> kexec reboot code.
> 
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index 31cba91..8843623 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -85,6 +85,7 @@ void soft_restart(unsigned long addr)
> 
>         smp_secondary_shutdown();
> 
> +       while(1);
>         /* Switch to the identity mapping */
>         phys_reset = (phys_reset_t)virt_to_phys(cpu_reset);
>         phys_reset(addr);
> 
> I break into target with BDI3000 now; and see the below output
> 
> TARGET#0>state
> Core#0: halted 0xffffffc000085240 External Debug Request
> Core#1: halted 0x0000004000080394 External Debug Request
> Core#2: halted 0x0000004000080394 External Debug Request
> Core#3: halted 0x0000004000080394 External Debug Request
> Core#4: halted 0xffffffc0000802f8 External Debug Request
> Core#5: halted 0x0000004000080394 External Debug Request
> Core#6: halted 0xffffffc0000802f8 External Debug Request
> Core#7: halted 0x0000004000080394 External Debug Request
> 
> I think some of the secondary CPUs are not behaving as expected;
> As of now I don't have any clues for this.
> 
> 
> --Arun
> 
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