void debug_set_level(debug_info_t* id, int new_level);
+void debug_set_critical(void);
void debug_stop_all(void);
static inline debug_entry_t*
extern int diag308(unsigned long subcode, void *addr);
extern void diag308_reset(void);
extern void store_status(void);
+extern void lgr_info_log(void);
#endif /* _ASM_S390_IPL_H */
#ifndef __ASM_SYSTEM_H
#define __ASM_SYSTEM_H
+#include <linux/preempt.h>
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/string.h>
#include <asm/types.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
return (*ptr & (0x80 >> (nr & 7))) != 0;
}
+/**
+ * stfle - Store facility list extended
+ * @stfle_fac_list: array where facility list can be stored
+ * @size: size of passed in array in double words
+ */
+static inline void stfle(u64 *stfle_fac_list, int size)
+{
+ unsigned long nr;
+
+ preempt_disable();
+ S390_lowcore.stfl_fac_list = 0;
+ asm volatile(
+ " .insn s,0xb2b10000,0(0)\n" /* stfl */
+ "0:\n"
+ EX_TABLE(0b, 0b)
+ : "=m" (S390_lowcore.stfl_fac_list));
+ nr = 4; /* bytes stored by stfl */
+ memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
+ if (S390_lowcore.stfl_fac_list & 0x01000000) {
+ /* More facility bits available with stfle */
+ register unsigned long reg0 asm("0") = size - 1;
+
+ asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
+ : "+d" (reg0)
+ : "a" (stfle_fac_list)
+ : "memory", "cc");
+ nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
+ }
+ memset((char *) stfle_fac_list + nr, 0, size * 8 - nr);
+ preempt_enable();
+}
+
static inline unsigned short stap(void)
{
unsigned short cpu_address;
obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \
processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o \
debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o \
- sysinfo.o jump_label.o
+ sysinfo.o jump_label.o lgr.o
obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
* arch/s390/kernel/debug.c
* S/390 debug facility
*
- * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
+ * Copyright IBM Corp. 1999, 2012
+ *
* Author(s): Michael Holzheu (holzheu@de.ibm.com),
* Holger Smolinski (Holger.Smolinski@de.ibm.com)
*
static DEFINE_MUTEX(debug_mutex);
static int initialized;
+static int debug_critical;
static const struct file_operations debug_file_ops = {
.owner = THIS_MODULE,
}
+void debug_set_critical(void)
+{
+ debug_critical = 1;
+}
+
/*
* debug_event_common:
* - write debug entry with given size
if (!debug_active || !id->areas)
return NULL;
- spin_lock_irqsave(&id->lock, flags);
+ if (debug_critical) {
+ if (!spin_trylock_irqsave(&id->lock, flags))
+ return NULL;
+ } else
+ spin_lock_irqsave(&id->lock, flags);
active = get_active_entry(id);
memset(DEBUG_DATA(active), 0, id->buf_size);
memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
if (!debug_active || !id->areas)
return NULL;
- spin_lock_irqsave(&id->lock, flags);
+ if (debug_critical) {
+ if (!spin_trylock_irqsave(&id->lock, flags))
+ return NULL;
+ } else
+ spin_lock_irqsave(&id->lock, flags);
active = get_active_entry(id);
memset(DEBUG_DATA(active), 0, id->buf_size);
memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
return NULL;
numargs=debug_count_numargs(string);
- spin_lock_irqsave(&id->lock, flags);
+ if (debug_critical) {
+ if (!spin_trylock_irqsave(&id->lock, flags))
+ return NULL;
+ } else
+ spin_lock_irqsave(&id->lock, flags);
active = get_active_entry(id);
curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
va_start(ap,string);
numargs=debug_count_numargs(string);
- spin_lock_irqsave(&id->lock, flags);
+ if (debug_critical) {
+ if (!spin_trylock_irqsave(&id->lock, flags))
+ return NULL;
+ } else
+ spin_lock_irqsave(&id->lock, flags);
active = get_active_entry(id);
curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
va_start(ap,string);
rc += sprintf(out_buf + rc, "| ");
for (i = 0; i < id->buf_size; i++) {
unsigned char c = in_buf[i];
- if (!isprint(c))
- rc += sprintf(out_buf + rc, ".");
- else
+ if (isascii(c) && isprint(c))
rc += sprintf(out_buf + rc, "%c", c);
+ else
+ rc += sprintf(out_buf + rc, ".");
}
rc += sprintf(out_buf + rc, "\n");
return rc;
#include <asm/sysinfo.h>
#include <asm/cpcmd.h>
#include <asm/sclp.h>
+#include <asm/system.h>
#include "entry.h"
/*
static noinline __init void setup_facility_list(void)
{
- unsigned long nr;
-
- S390_lowcore.stfl_fac_list = 0;
- asm volatile(
- " .insn s,0xb2b10000,0(0)\n" /* stfl */
- "0:\n"
- EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list));
- memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
- nr = 4; /* # bytes stored by stfl */
- if (test_facility(7)) {
- /* More facility bits available with stfle */
- register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1;
- asm volatile(".insn s,0xb2b00000,%0" /* stfle */
- : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0)
- : : "cc");
- nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
- }
- memset((char *) S390_lowcore.stfle_fac_list + nr, 0,
- MAX_FACILITY_BIT/8 - nr);
+ stfle(S390_lowcore.stfle_fac_list,
+ ARRAY_SIZE(S390_lowcore.stfle_fac_list));
}
static noinline __init void setup_hpage(void)
#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/crash_dump.h>
+#include <linux/debug_locks.h>
#include <asm/ipl.h>
#include <asm/smp.h>
#include <asm/setup.h>
#include <asm/reset.h>
#include <asm/sclp.h>
#include <asm/checksum.h>
+#include <asm/debug.h>
#include "entry.h"
#define IPL_PARM_BLOCK_VERSION 0
static void do_panic(void)
{
+ lgr_info_log();
on_panic_trigger.action->fn(&on_panic_trigger);
stop_run(&on_panic_trigger);
}
void do_restart(void)
{
+ tracing_off();
+ debug_locks_off();
+ lgr_info_log();
smp_call_online_cpu(__do_restart, NULL);
}
--- /dev/null
+/*
+ * Linux Guest Relocation (LGR) detection
+ *
+ * Copyright IBM Corp. 2012
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <asm/sysinfo.h>
+#include <asm/ebcdic.h>
+#include <asm/system.h>
+#include <asm/debug.h>
+#include <asm/ipl.h>
+
+#define LGR_TIMER_INTERVAL_SECS (30 * 60)
+#define VM_LEVEL_MAX 2 /* Maximum is 8, but we only record two levels */
+
+/*
+ * LGR info: Contains stfle and stsi data
+ */
+struct lgr_info {
+ /* Bit field with facility information: 4 DWORDs are stored */
+ u64 stfle_fac_list[4];
+ /* Level of system (1 = CEC, 2 = LPAR, 3 = z/VM */
+ u32 level;
+ /* Level 1: CEC info (stsi 1.1.1) */
+ char manufacturer[16];
+ char type[4];
+ char sequence[16];
+ char plant[4];
+ char model[16];
+ /* Level 2: LPAR info (stsi 2.2.2) */
+ u16 lpar_number;
+ char name[8];
+ /* Level 3: VM info (stsi 3.2.2) */
+ u8 vm_count;
+ struct {
+ char name[8];
+ char cpi[16];
+ } vm[VM_LEVEL_MAX];
+} __packed __aligned(8);
+
+/*
+ * LGR globals
+ */
+static void *lgr_page;
+static struct lgr_info lgr_info_last;
+static struct lgr_info lgr_info_cur;
+static struct debug_info *lgr_dbf;
+
+/*
+ * Return number of valid stsi levels
+ */
+static inline int stsi_0(void)
+{
+ int rc = stsi(NULL, 0, 0, 0);
+
+ return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
+}
+
+/*
+ * Copy buffer and then convert it to ASCII
+ */
+static void cpascii(char *dst, char *src, int size)
+{
+ memcpy(dst, src, size);
+ EBCASC(dst, size);
+}
+
+/*
+ * Fill LGR info with 1.1.1 stsi data
+ */
+static void lgr_stsi_1_1_1(struct lgr_info *lgr_info)
+{
+ struct sysinfo_1_1_1 *si = lgr_page;
+
+ if (stsi(si, 1, 1, 1) == -ENOSYS)
+ return;
+ cpascii(lgr_info->manufacturer, si->manufacturer,
+ sizeof(si->manufacturer));
+ cpascii(lgr_info->type, si->type, sizeof(si->type));
+ cpascii(lgr_info->model, si->model, sizeof(si->model));
+ cpascii(lgr_info->sequence, si->sequence, sizeof(si->sequence));
+ cpascii(lgr_info->plant, si->plant, sizeof(si->plant));
+}
+
+/*
+ * Fill LGR info with 2.2.2 stsi data
+ */
+static void lgr_stsi_2_2_2(struct lgr_info *lgr_info)
+{
+ struct sysinfo_2_2_2 *si = lgr_page;
+
+ if (stsi(si, 2, 2, 2) == -ENOSYS)
+ return;
+ cpascii(lgr_info->name, si->name, sizeof(si->name));
+ memcpy(&lgr_info->lpar_number, &si->lpar_number,
+ sizeof(lgr_info->lpar_number));
+}
+
+/*
+ * Fill LGR info with 3.2.2 stsi data
+ */
+static void lgr_stsi_3_2_2(struct lgr_info *lgr_info)
+{
+ struct sysinfo_3_2_2 *si = lgr_page;
+ int i;
+
+ if (stsi(si, 3, 2, 2) == -ENOSYS)
+ return;
+ for (i = 0; i < min_t(u8, si->count, VM_LEVEL_MAX); i++) {
+ cpascii(lgr_info->vm[i].name, si->vm[i].name,
+ sizeof(si->vm[i].name));
+ cpascii(lgr_info->vm[i].cpi, si->vm[i].cpi,
+ sizeof(si->vm[i].cpi));
+ }
+ lgr_info->vm_count = si->count;
+}
+
+/*
+ * Fill LGR info with current data
+ */
+static void lgr_info_get(struct lgr_info *lgr_info)
+{
+ memset(lgr_info, 0, sizeof(*lgr_info));
+ stfle(lgr_info->stfle_fac_list, ARRAY_SIZE(lgr_info->stfle_fac_list));
+ lgr_info->level = stsi_0();
+ if (lgr_info->level == -ENOSYS)
+ return;
+ if (lgr_info->level >= 1)
+ lgr_stsi_1_1_1(lgr_info);
+ if (lgr_info->level >= 2)
+ lgr_stsi_2_2_2(lgr_info);
+ if (lgr_info->level >= 3)
+ lgr_stsi_3_2_2(lgr_info);
+}
+
+/*
+ * Check if LGR info has changed and if yes log new LGR info to s390dbf
+ */
+void lgr_info_log(void)
+{
+ static DEFINE_SPINLOCK(lgr_info_lock);
+ unsigned long flags;
+
+ if (!spin_trylock_irqsave(&lgr_info_lock, flags))
+ return;
+ lgr_info_get(&lgr_info_cur);
+ if (memcmp(&lgr_info_last, &lgr_info_cur, sizeof(lgr_info_cur)) != 0) {
+ debug_event(lgr_dbf, 1, &lgr_info_cur, sizeof(lgr_info_cur));
+ lgr_info_last = lgr_info_cur;
+ }
+ spin_unlock_irqrestore(&lgr_info_lock, flags);
+}
+EXPORT_SYMBOL_GPL(lgr_info_log);
+
+static void lgr_timer_set(void);
+
+/*
+ * LGR timer callback
+ */
+static void lgr_timer_fn(unsigned long ignored)
+{
+ lgr_info_log();
+ lgr_timer_set();
+}
+
+static struct timer_list lgr_timer =
+ TIMER_DEFERRED_INITIALIZER(lgr_timer_fn, 0, 0);
+
+/*
+ * Setup next LGR timer
+ */
+static void lgr_timer_set(void)
+{
+ mod_timer(&lgr_timer, jiffies + LGR_TIMER_INTERVAL_SECS * HZ);
+}
+
+/*
+ * Initialize LGR: Add s390dbf, write initial lgr_info and setup timer
+ */
+static int __init lgr_init(void)
+{
+ lgr_page = (void *) __get_free_pages(GFP_KERNEL, 0);
+ if (!lgr_page)
+ return -ENOMEM;
+ lgr_dbf = debug_register("lgr", 1, 1, sizeof(struct lgr_info));
+ if (!lgr_dbf) {
+ free_page((unsigned long) lgr_page);
+ return -ENOMEM;
+ }
+ debug_register_view(lgr_dbf, &debug_hex_ascii_view);
+ lgr_info_get(&lgr_info_last);
+ debug_event(lgr_dbf, 1, &lgr_info_last, sizeof(lgr_info_last));
+ lgr_timer_set();
+ return 0;
+}
+module_init(lgr_init);
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/ftrace.h>
+#include <linux/debug_locks.h>
#include <asm/cio.h>
#include <asm/setup.h>
#include <asm/pgtable.h>
struct kimage *image = data;
pfault_fini();
- if (image->type == KEXEC_TYPE_CRASH)
+ tracing_off();
+ debug_locks_off();
+ if (image->type == KEXEC_TYPE_CRASH) {
+ lgr_info_log();
s390_reset_system(__do_machine_kdump, data);
- else
+ } else {
s390_reset_system(__do_machine_kexec, data);
+ }
disabled_wait((unsigned long) __builtin_return_address(0));
}
#include <asm/lowcore.h>
#include <asm/sclp.h>
#include <asm/vdso.h>
+#include <asm/debug.h>
#include "entry.h"
enum {
__load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
trace_hardirqs_off();
+ debug_set_critical();
cpumask_copy(&cpumask, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &cpumask);
lghi %r2,0
brasl %r14,arch_set_page_states
+ /* Log potential guest relocation */
+ brasl %r14,lgr_info_log
+
/* Reinitialize the channel subsystem */
brasl %r14,channel_subsystem_reinit
#include <asm/cpcmd.h>
#include <asm/lowcore.h>
#include <asm/debug.h>
+#include <asm/ipl.h>
#include "entry.h"
void (*pgm_check_table[128])(struct pt_regs *regs);
static int die_counter;
oops_enter();
+ lgr_info_log();
debug_stop_all();
console_verbose();
spin_lock_irq(&die_lock);
#include <linux/atomic.h>
#include <asm/debug.h>
#include <asm/qdio.h>
+#include <asm/ipl.h>
#include "cio.h"
#include "css.h"
q->nr, q->first_to_kick, count, irq_ptr->int_parm);
no_handler:
qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
+ /*
+ * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
+ * Therefore we call the LGR detection function here.
+ */
+ lgr_info_log();
}
static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
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