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s390/kernel: Remove OS info init function call and diag 308 for kdump 

Because of a design change for stand-alone kdump the function that
was done by the OS info init function is moved to the boot loader
code. This has two implications that are implemented by this patch:
a) The OS info init function is no longer called by the kernel
b) The diag 308 subcode 1 reset is no longer done by the kdump boot code.
   This is necessary because otherwise the operation that is done now
   by the boot loader would be reversed. For the normal kexec based
   kdump mechansim the reset is already done by the kdump trigger code
   (e.g. panic or PSW restart).

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2012-05-18 14:29:19 +02:00 committed by Martin Schwidefsky
parent 6101167727
commit d7b7cdea06
4 changed files with 2 additions and 23 deletions
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5
arch/s390/include/asm/os_info.h
View File

@ -13,7 +13,6 @@
#define OS_INFO_VMCOREINFO 0
#define OS_INFO_REIPL_BLOCK 1
#define OS_INFO_INIT_FN 2
struct os_info_entry {
u64 addr;
@ -28,8 +27,8 @@ struct os_info {
u16 version_minor;
u64 crashkernel_addr;
u64 crashkernel_size;
struct os_info_entry entry[3];
u8 reserved[4004];
struct os_info_entry entry[2];
u8 reserved[4024];
} __packed;
void os_info_init(void);

7
arch/s390/kernel/head_kdump.S
View File

@ -85,11 +85,6 @@ startup_kdump_relocated:
basr %r13,0
0:
mvc 0(8,%r0),.Lrestart_psw-0b(%r13) # Setup restart PSW
mvc 464(16,%r0),.Lpgm_psw-0b(%r13) # Setup pgm check PSW
lhi %r1,1 # Start new kernel
diag %r1,%r1,0x308 # with diag 308
.Lno_diag308: # No diag 308
sam31 # Switch to 31 bit addr mode
sr %r1,%r1 # Erase register r1
sr %r2,%r2 # Erase register r2
@ -98,8 +93,6 @@ startup_kdump_relocated:
.align 8
.Lrestart_psw:
.long 0x00080000,0x80000000 + startup
.Lpgm_psw:
.quad 0x0000000180000000,0x0000000000000000 + .Lno_diag308
#else
.align 2
.Lep_startup_kdump:

1
arch/s390/kernel/os_info.c
View File

@ -138,7 +138,6 @@ static void os_info_old_init(void)
goto fail_free;
os_info_old_alloc(OS_INFO_VMCOREINFO, 1);
os_info_old_alloc(OS_INFO_REIPL_BLOCK, 1);
os_info_old_alloc(OS_INFO_INIT_FN, PAGE_SIZE);
pr_info("crashkernel: addr=0x%lx size=%lu\n",
(unsigned long) os_info_old->crashkernel_addr,
(unsigned long) os_info_old->crashkernel_size);

12
arch/s390/kernel/smp.c
View File

@ -800,17 +800,6 @@ void __noreturn cpu_die(void)
#endif /* CONFIG_HOTPLUG_CPU */
static void smp_call_os_info_init_fn(void)
{
int (*init_fn)(void);
unsigned long size;
init_fn = os_info_old_entry(OS_INFO_INIT_FN, &size);
if (!init_fn)
return;
init_fn();
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
/* request the 0x1201 emergency signal external interrupt */
@ -819,7 +808,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
/* request the 0x1202 external call external interrupt */
if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0)
panic("Couldn't request external interrupt 0x1202");
smp_call_os_info_init_fn();
smp_detect_cpus();
}