[S390] Reset infrastructure for re-IPL.
In case of re-IPL and diag308 doesn't work we have to reset all devices
manually and wait synchronously that each reset finished.
This patch adds the necessary infrastucture and the first exploiter of it.
Subsystems that need to add a function that needs to be called at re-IPL
may register/unregister this function via
struct reset_call {
struct reset_call *next;
void (*fn)(void);
};
void register_reset_call(struct reset_call *reset);
void unregister_reset_call(struct reset_call *reset);
When the registered function get called the context is:
- all cpus beside the current one are stopped
- all machine checks and interrupts are disabled
- prefixing is disabled
- a default machine check handler is available for use
The registered functions may not take any locks are sleep.
For the common I/O layer part of this patch:
Introduce a reset_call css_reset that does the following:
- clear all subchannels
- perform a rchp on all channel paths and wait for the resulting
machine checks
This replaces the calls to clear_all_subchannels() and
cio_reset_channel_paths() for kexec and ccw reipl. reipl_ccw_dev() now
uses reipl_find_schid() to determine the subchannel id for a given
device id.
Also remove cio_reset_channel_paths() and friends since they are not
needed anymore.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/reipl.S b/arch/s390/kernel/reipl.S
index 0340477..f9434d4 100644
--- a/arch/s390/kernel/reipl.S
+++ b/arch/s390/kernel/reipl.S
@@ -11,19 +11,10 @@
.globl do_reipl_asm
do_reipl_asm: basr %r13,0
.Lpg0: lpsw .Lnewpsw-.Lpg0(%r13)
-
- # switch off lowcore protection
-
-.Lpg1: stctl %c0,%c0,.Lctlsave1-.Lpg0(%r13)
- stctl %c0,%c0,.Lctlsave2-.Lpg0(%r13)
- ni .Lctlsave1-.Lpg0(%r13),0xef
- lctl %c0,%c0,.Lctlsave1-.Lpg0(%r13)
-
- # do store status of all registers
+.Lpg1: # do store status of all registers
stm %r0,%r15,__LC_GPREGS_SAVE_AREA
stctl %c0,%c15,__LC_CREGS_SAVE_AREA
- mvc __LC_CREGS_SAVE_AREA(4),.Lctlsave2-.Lpg0(%r13)
stam %a0,%a15,__LC_AREGS_SAVE_AREA
stpx __LC_PREFIX_SAVE_AREA
stckc .Lclkcmp-.Lpg0(%r13)
@@ -56,8 +47,7 @@
.L002: tm .Liplirb+8-.Lpg0(%r13),0xf3
jz .L003
bas %r14,.Ldisab-.Lpg0(%r13)
-.L003: spx .Lnull-.Lpg0(%r13)
- st %r1,__LC_SUBCHANNEL_ID
+.L003: st %r1,__LC_SUBCHANNEL_ID
lpsw 0
sigp 0,0,0(6)
.Ldisab: st %r14,.Ldispsw+4-.Lpg0(%r13)
@@ -65,9 +55,6 @@
.align 8
.Lclkcmp: .quad 0x0000000000000000
.Lall: .long 0xff000000
-.Lnull: .long 0x00000000
-.Lctlsave1: .long 0x00000000
-.Lctlsave2: .long 0x00000000
.align 8
.Lnewpsw: .long 0x00080000,0x80000000+.Lpg1
.Lpcnew: .long 0x00080000,0x80000000+.Lecs