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[S390] zfcpdump support.

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s390 machines provide hardware support for creating Linux dumps on SCSI
disks. For creating a dump a special purpose dump Linux is used. The first
32 MB of memory are saved by the hardware before the dump Linux is
booted. Via an SCLP interface, the saved memory can be accessed from
Linux. This patch exports memory and registers of the crashed Linux to
userspace via a debugfs file. For more information refer to
Documentation/s390/zfcpdump.txt, which is included in this patch.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Michael Holzheu
2007-04-27 16:01:49 +02:00
committed by Martin Schwidefsky
parent 7039d3a11c
commit 411ed32257
17 changed files with 1411 additions and 86 deletions
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72
arch/s390/kernel/head64.S
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@@ -39,7 +39,69 @@ startup_continue:
basr %r13,0 # get base
.LPG1: sll %r13,1 # remove high order bit
srl %r13,1
lhi %r1,1 # mode 1 = esame
#ifdef CONFIG_ZFCPDUMP
# check if we have been ipled using zfcp dump:
tm 0xb9,0x01 # test if subchannel is enabled
jno .nodump # subchannel disabled
l %r1,0xb8
la %r5,.Lipl_schib-.LPG1(%r13)
stsch 0(%r5) # get schib of subchannel
jne .nodump # schib not available
tm 5(%r5),0x01 # devno valid?
jno .nodump
tm 4(%r5),0x80 # qdio capable device?
jno .nodump
l %r2,20(%r0) # address of ipl parameter block
lhi %r3,0
ic %r3,0x148(%r2) # get opt field
chi %r3,0x20 # load with dump?
jne .nodump
# store all prefix registers in case of load with dump:
la %r7,0 # base register for 0 page
la %r8,0 # first cpu
l %r11,.Lpref_arr_ptr-.LPG1(%r13) # address of prefix array
ahi %r11,4 # skip boot cpu
lr %r12,%r11
ahi %r12,(CONFIG_NR_CPUS*4) # end of prefix array
stap .Lcurrent_cpu+2-.LPG1(%r13) # store current cpu addr
1:
cl %r8,.Lcurrent_cpu-.LPG1(%r13) # is ipl cpu ?
je 4f # if yes get next cpu
2:
lr %r9,%r7
sigp %r9,%r8,0x9 # stop & store status of cpu
brc 8,3f # accepted
brc 4,4f # status stored: next cpu
brc 2,2b # busy: try again
brc 1,4f # not op: next cpu
3:
mvc 0(4,%r11),264(%r7) # copy prefix register to prefix array
ahi %r11,4 # next element in prefix array
clr %r11,%r12
je 5f # no more space in prefix array
4:
ahi %r8,1 # next cpu (r8 += 1)
cl %r8,.Llast_cpu-.LPG1(%r13) # is last possible cpu ?
jl 1b # jump if not last cpu
5:
lhi %r1,2 # mode 2 = esame (dump)
j 6f
.align 4
.Lipl_schib:
.rept 13
.long 0
.endr
.nodump:
lhi %r1,1 # mode 1 = esame (normal ipl)
6:
#else
lhi %r1,1 # mode 1 = esame (normal ipl)
#endif /* CONFIG_ZFCPDUMP */
mvi __LC_AR_MODE_ID,1 # set esame flag
slr %r0,%r0 # set cpuid to zero
sigp %r1,%r0,0x12 # switch to esame mode
@@ -149,6 +211,14 @@ startup_continue:
.L4malign:.quad 0xffffffffffc00000
.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
.Lnop: .long 0x07000700
#ifdef CONFIG_ZFCPDUMP
.Lcurrent_cpu:
.long 0x0
.Llast_cpu:
.long 0x0000ffff
.Lpref_arr_ptr:
.long zfcpdump_prefix_array
#endif /* CONFIG_ZFCPDUMP */
.Lparmaddr:
.quad PARMAREA
.align 64