• Mahesh Salgaonkar's avatar
    powerpc/pseries: Dump the SLB contents on SLB MCE errors. · c6d15258
    Mahesh Salgaonkar authored
    If we get a machine check exceptions due to SLB errors then dump the
    current SLB contents which will be very much helpful in debugging the
    root cause of SLB errors. Introduce an exclusive buffer per cpu to hold
    faulty SLB entries. In real mode mce handler saves the old SLB contents
    into this buffer accessible through paca and print it out later in virtual
    mode.
    
    With this patch the console will log SLB contents like below on SLB MCE
    errors:
    
    [  507.297236] SLB contents of cpu 0x1
    [  507.297237] Last SLB entry inserted at slot 16
    [  507.297238] 00 c000000008000000 400ea1b217000500
    [  507.297239]   1T  ESID=   c00000  VSID=      ea1b217 LLP:100
    [  507.297240] 01 d000000008000000 400d43642f000510
    [  507.297242]   1T  ESID=   d00000  VSID=      d43642f LLP:110
    [  507.297243] 11 f000000008000000 400a86c85f000500
    [  507.297244]   1T  ESID=   f00000  VSID=      a86c85f LLP:100
    [  507.297245] 12 00007f0008000000 4008119624000d90
    [  507.297246]   1T  ESID=       7f  VSID=      8119624 LLP:110
    [  507.297247] 13 0000000018000000 00092885f5150d90
    [  507.297247]  256M ESID=        1  VSID=   92885f5150 LLP:110
    [  507.297248] 14 0000010008000000 4009e7cb50000d90
    [  507.297249]   1T  ESID=        1  VSID=      9e7cb50 LLP:110
    [  507.297250] 15 d000000008000000 400d43642f000510
    [  507.297251]   1T  ESID=   d00000  VSID=      d43642f LLP:110
    [  507.297252] 16 d000000008000000 400d43642f000510
    [  507.297253]   1T  ESID=   d00000  VSID=      d43642f LLP:110
    [  507.297253] ----------------------------------
    [  507.297254] SLB cache ptr value = 3
    [  507.297254] Valid SLB cache entries:
    [  507.297255] 00 EA[0-35]=    7f000
    [  507.297256] 01 EA[0-35]=        1
    [  507.297257] 02 EA[0-35]=     1000
    [  507.297257] Rest of SLB cache entries:
    [  507.297258] 03 EA[0-35]=    7f000
    [  507.297258] 04 EA[0-35]=        1
    [  507.297259] 05 EA[0-35]=     1000
    [  507.297260] 06 EA[0-35]=       12
    [  507.297260] 07 EA[0-35]=    7f000
    Suggested-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Suggested-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: default avatarMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
    Reviewed-by: default avatarNicholas Piggin <npiggin@gmail.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    c6d15258
paca.h 8.46 KB