diff options
| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2015-05-26 19:05:23 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-06-25 09:39:26 +0200 |
| commit | 1592a8e456436024b6c662f423ce672e672169bb (patch) | |
| tree | 2afa9f14819db46b7e11e918e5f69124dc31f71c /arch/s390/kernel/base.S | |
| parent | s390: new default configuration (diff) | |
| download | linux-1592a8e456436024b6c662f423ce672e672169bb.tar.xz linux-1592a8e456436024b6c662f423ce672e672169bb.zip | |
s390/kdump: fix nosmt kernel parameter
It turned out that SIGP set-multi-threading can only be done once.
Therefore switching to a different MT level after switching to
sclp.mtid_prev in the dump case fails.
As a symptom specifying the "nosmt" parameter currently fails for
the kdump kernel and the kernel starts with multi-threading enabled.
So fix this and issue diag 308 subcode 1 call after collecting the
CPU states for the dump. Also enhance the diag308_reset() function to
be usable also with enabled lowcore protection and prefix register != 0.
After the reset it is possible to switch the MT level again. We have
to do the reset very early in order not to kill the already initialized
console. Therefore instead of kmalloc() the corresponding memblock
functions have to be used. To avoid copying the sclp cpu code into
sclp_early, we now use the simple sigp loop method for CPU detection.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/base.S')
| -rw-r--r-- | arch/s390/kernel/base.S | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S index daed3fde42ec..326f717df587 100644 --- a/arch/s390/kernel/base.S +++ b/arch/s390/kernel/base.S @@ -78,15 +78,20 @@ s390_base_pgm_handler_fn: # # Calls diag 308 subcode 1 and continues execution # -# The following conditions must be ensured before calling this function: -# * Prefix register = 0 -# * Lowcore protection is disabled -# ENTRY(diag308_reset) larl %r4,.Lctlregs # Save control registers stctg %c0,%c15,0(%r4) + lg %r2,0(%r4) # Disable lowcore protection + nilh %r2,0xefff + larl %r4,.Lctlreg0 + stg %r2,0(%r4) + lctlg %c0,%c0,0(%r4) larl %r4,.Lfpctl # Floating point control register stfpc 0(%r4) + larl %r4,.Lprefix # Save prefix register + stpx 0(%r4) + larl %r4,.Lprefix_zero # Set prefix register to 0 + spx 0(%r4) larl %r4,.Lcontinue_psw # Save PSW flags epsw %r2,%r3 stm %r2,%r3,0(%r4) @@ -106,6 +111,8 @@ ENTRY(diag308_reset) lctlg %c0,%c15,0(%r4) larl %r4,.Lfpctl # Restore floating point ctl register lfpc 0(%r4) + larl %r4,.Lprefix # Restore prefix register + spx 0(%r4) larl %r4,.Lcontinue_psw # Restore PSW flags lpswe 0(%r4) .Lcontinue: @@ -122,10 +129,16 @@ ENTRY(diag308_reset) .section .bss .align 8 +.Lctlreg0: + .quad 0 .Lctlregs: .rept 16 .quad 0 .endr .Lfpctl: .long 0 +.Lprefix: + .long 0 +.Lprefix_zero: + .long 0 .previous |