Commit d7b7cdea authored by Michael Holzheu's avatar Michael Holzheu Committed by Martin Schwidefsky
Browse files

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: default avatarMichael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 61011677

arch/s390/include/asm/os_info.h

+2 −3
Original line number Diff line number Diff line
@@ -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);

arch/s390/kernel/head_kdump.S

+0 −7
Original line number Diff line number Diff line
@@ -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:

arch/s390/kernel/os_info.c

+0 −1
Original line number Diff line number Diff line
@@ -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);

arch/s390/kernel/smp.c

+0 −12
Original line number Diff line number Diff line
@@ -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();

}

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