]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
s390/startup: add pgm check info printing
authorVasily Gorbik <gor@linux.ibm.com>
Thu, 8 Aug 2019 18:09:08 +0000 (20:09 +0200)
committerHeiko Carstens <heiko.carstens@de.ibm.com>
Fri, 13 Sep 2019 10:17:37 +0000 (12:17 +0200)
commit724dc336b79ff965bd5773257642685cf33ed9af
tree07e170c62e17f6158f1fa8be0e489b6802c8ecfa
parent9e323d45ba94262620a073a3f9945ca927c07c71
s390/startup: add pgm check info printing

Try to print out startup pgm check info including exact linux kernel
version, pgm interruption code and ilc, psw and general registers. Like
the following:

Linux version 5.3.0-rc7-07282-ge7b4d41d61bd-dirty (gor@tuxmaker) #3 SMP PREEMPT Thu Sep 5 16:07:34 CEST 2019
Kernel fault: interruption code 0005 ilc:2
PSW : 0000000180000000 0000000000012e52
      R:0 T:0 IO:0 EX:0 Key:0 M:0 W:0 P:0 AS:0 CC:0 PM:0 RI:0 EA:3
GPRS: 0000000000000000 00ffffffffffffff 0000000000000000 0000000000019a58
      000000000000bf68 0000000000000000 0000000000000000 0000000000000000
      0000000000000000 0000000000000000 000000000001a041 0000000000000000
      0000000004c9c000 0000000000010070 0000000000012e42 000000000000beb0

This info makes it apparent that kernel startup failed and might help
to understand what went wrong without actual standalone dump.

Printing code runs on its own stack of 1 page (at unused 0x5000), which
should be sufficient for sclp_early_printk usage (typical stack usage
observed has been around 512 bytes).

The code has pgm check recursion prevention, despite pgm check info
printing failure (follow on pgm check) or success it restores original
faulty psw and gprs and does disabled wait.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
arch/s390/boot/Makefile
arch/s390/boot/boot.h
arch/s390/boot/head.S
arch/s390/boot/pgm_check_info.c [new file with mode: 0644]