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>

4 files changed, 2 insertions, 23 deletions

diff --git a/arch/s390/include/asm/os_info.h b/arch/s390/include/asm/os_info.h
index d07518af09e..295f2c4f1c9 100644
--- a/arch/s390/include/asm/os_info.h
+++ b/arch/s390/include/asm/os_info.h
@@ -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);
diff --git a/arch/s390/kernel/head_kdump.S b/arch/s390/kernel/head_kdump.S
index e1ac3893e97..796c976b5fd 100644
--- a/arch/s390/kernel/head_kdump.S
+++ b/arch/s390/kernel/head_kdump.S
@@ -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:
diff --git a/arch/s390/kernel/os_info.c b/arch/s390/kernel/os_info.c
index e8d6c214d49..f2fe18f3f01 100644
--- a/arch/s390/kernel/os_info.c
+++ b/arch/s390/kernel/os_info.c
@@ -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);
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 647ba942589..9948bd09ee5 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -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();
 }