276 lines
6.1 KiB
C
276 lines
6.1 KiB
C
/*
|
|
* Copyright IBM Corp. 2005, 2011
|
|
*
|
|
* Author(s): Rolf Adelsberger,
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
* Michael Holzheu <holzheu@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/debug_locks.h>
|
|
#include <linux/suspend.h>
|
|
#include <asm/cio.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/reset.h>
|
|
#include <asm/ipl.h>
|
|
#include <asm/diag.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/os_info.h>
|
|
#include <asm/switch_to.h>
|
|
|
|
typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
|
|
|
|
extern const unsigned char relocate_kernel[];
|
|
extern const unsigned long long relocate_kernel_len;
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
|
|
/*
|
|
* Create ELF notes for one CPU
|
|
*/
|
|
static void add_elf_notes(int cpu)
|
|
{
|
|
struct save_area *sa = (void *) 4608 + store_prefix();
|
|
void *ptr;
|
|
|
|
memcpy((void *) (4608UL + sa->pref_reg), sa, sizeof(*sa));
|
|
ptr = (u64 *) per_cpu_ptr(crash_notes, cpu);
|
|
ptr = fill_cpu_elf_notes(ptr, sa, NULL);
|
|
memset(ptr, 0, sizeof(struct elf_note));
|
|
}
|
|
|
|
/*
|
|
* Initialize CPU ELF notes
|
|
*/
|
|
static void setup_regs(void)
|
|
{
|
|
unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE;
|
|
struct _lowcore *lc;
|
|
int cpu, this_cpu;
|
|
|
|
/* Get lowcore pointer from store status of this CPU (absolute zero) */
|
|
lc = (struct _lowcore *)(unsigned long)S390_lowcore.prefixreg_save_area;
|
|
this_cpu = smp_find_processor_id(stap());
|
|
add_elf_notes(this_cpu);
|
|
for_each_online_cpu(cpu) {
|
|
if (cpu == this_cpu)
|
|
continue;
|
|
if (smp_store_status(cpu))
|
|
continue;
|
|
add_elf_notes(cpu);
|
|
}
|
|
if (MACHINE_HAS_VX)
|
|
save_vx_regs_safe((void *) lc->vector_save_area_addr);
|
|
/* Copy dump CPU store status info to absolute zero */
|
|
memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
|
|
}
|
|
|
|
/*
|
|
* PM notifier callback for kdump
|
|
*/
|
|
static int machine_kdump_pm_cb(struct notifier_block *nb, unsigned long action,
|
|
void *ptr)
|
|
{
|
|
switch (action) {
|
|
case PM_SUSPEND_PREPARE:
|
|
case PM_HIBERNATION_PREPARE:
|
|
if (crashk_res.start)
|
|
crash_map_reserved_pages();
|
|
break;
|
|
case PM_POST_SUSPEND:
|
|
case PM_POST_HIBERNATION:
|
|
if (crashk_res.start)
|
|
crash_unmap_reserved_pages();
|
|
break;
|
|
default:
|
|
return NOTIFY_DONE;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static int __init machine_kdump_pm_init(void)
|
|
{
|
|
pm_notifier(machine_kdump_pm_cb, 0);
|
|
return 0;
|
|
}
|
|
arch_initcall(machine_kdump_pm_init);
|
|
|
|
/*
|
|
* Start kdump: We expect here that a store status has been done on our CPU
|
|
*/
|
|
static void __do_machine_kdump(void *image)
|
|
{
|
|
int (*start_kdump)(int) = (void *)((struct kimage *) image)->start;
|
|
|
|
__load_psw_mask(PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA);
|
|
start_kdump(1);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Check if kdump checksums are valid: We call purgatory with parameter "0"
|
|
*/
|
|
static int kdump_csum_valid(struct kimage *image)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
int (*start_kdump)(int) = (void *)image->start;
|
|
int rc;
|
|
|
|
__arch_local_irq_stnsm(0xfb); /* disable DAT */
|
|
rc = start_kdump(0);
|
|
__arch_local_irq_stosm(0x04); /* enable DAT */
|
|
return rc ? 0 : -EINVAL;
|
|
#else
|
|
return -EINVAL;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Map or unmap crashkernel memory
|
|
*/
|
|
static void crash_map_pages(int enable)
|
|
{
|
|
unsigned long size = resource_size(&crashk_res);
|
|
|
|
BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN ||
|
|
size % KEXEC_CRASH_MEM_ALIGN);
|
|
if (enable)
|
|
vmem_add_mapping(crashk_res.start, size);
|
|
else {
|
|
vmem_remove_mapping(crashk_res.start, size);
|
|
if (size)
|
|
os_info_crashkernel_add(crashk_res.start, size);
|
|
else
|
|
os_info_crashkernel_add(0, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Map crashkernel memory
|
|
*/
|
|
void crash_map_reserved_pages(void)
|
|
{
|
|
crash_map_pages(1);
|
|
}
|
|
|
|
/*
|
|
* Unmap crashkernel memory
|
|
*/
|
|
void crash_unmap_reserved_pages(void)
|
|
{
|
|
crash_map_pages(0);
|
|
}
|
|
|
|
/*
|
|
* Give back memory to hypervisor before new kdump is loaded
|
|
*/
|
|
static int machine_kexec_prepare_kdump(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (MACHINE_IS_VM)
|
|
diag10_range(PFN_DOWN(crashk_res.start),
|
|
PFN_DOWN(crashk_res.end - crashk_res.start + 1));
|
|
return 0;
|
|
#else
|
|
return -EINVAL;
|
|
#endif
|
|
}
|
|
|
|
int machine_kexec_prepare(struct kimage *image)
|
|
{
|
|
void *reboot_code_buffer;
|
|
|
|
/* Can't replace kernel image since it is read-only. */
|
|
if (ipl_flags & IPL_NSS_VALID)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (image->type == KEXEC_TYPE_CRASH)
|
|
return machine_kexec_prepare_kdump();
|
|
|
|
/* We don't support anything but the default image type for now. */
|
|
if (image->type != KEXEC_TYPE_DEFAULT)
|
|
return -EINVAL;
|
|
|
|
/* Get the destination where the assembler code should be copied to.*/
|
|
reboot_code_buffer = (void *) page_to_phys(image->control_code_page);
|
|
|
|
/* Then copy it */
|
|
memcpy(reboot_code_buffer, relocate_kernel, relocate_kernel_len);
|
|
return 0;
|
|
}
|
|
|
|
void machine_kexec_cleanup(struct kimage *image)
|
|
{
|
|
}
|
|
|
|
void arch_crash_save_vmcoreinfo(void)
|
|
{
|
|
VMCOREINFO_SYMBOL(lowcore_ptr);
|
|
VMCOREINFO_SYMBOL(high_memory);
|
|
VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS);
|
|
}
|
|
|
|
void machine_shutdown(void)
|
|
{
|
|
}
|
|
|
|
void machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Do normal kexec
|
|
*/
|
|
static void __do_machine_kexec(void *data)
|
|
{
|
|
relocate_kernel_t data_mover;
|
|
struct kimage *image = data;
|
|
|
|
data_mover = (relocate_kernel_t) page_to_phys(image->control_code_page);
|
|
|
|
/* Call the moving routine */
|
|
(*data_mover)(&image->head, image->start);
|
|
}
|
|
|
|
/*
|
|
* Reset system and call either kdump or normal kexec
|
|
*/
|
|
static void __machine_kexec(void *data)
|
|
{
|
|
__arch_local_irq_stosm(0x04); /* enable DAT */
|
|
pfault_fini();
|
|
tracing_off();
|
|
debug_locks_off();
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (((struct kimage *) data)->type == KEXEC_TYPE_CRASH) {
|
|
|
|
lgr_info_log();
|
|
s390_reset_system(setup_regs, __do_machine_kdump, data);
|
|
} else
|
|
#endif
|
|
s390_reset_system(NULL, __do_machine_kexec, data);
|
|
disabled_wait((unsigned long) __builtin_return_address(0));
|
|
}
|
|
|
|
/*
|
|
* Do either kdump or normal kexec. In case of kdump we first ask
|
|
* purgatory, if kdump checksums are valid.
|
|
*/
|
|
void machine_kexec(struct kimage *image)
|
|
{
|
|
if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image))
|
|
return;
|
|
tracer_disable();
|
|
smp_send_stop();
|
|
smp_call_ipl_cpu(__machine_kexec, image);
|
|
}
|