diff options
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/debug.c | 40 | ||||
| -rw-r--r-- | arch/s390/kernel/early.c | 22 | ||||
| -rw-r--r-- | arch/s390/kernel/ipl.c | 6 | ||||
| -rw-r--r-- | arch/s390/kernel/lgr.c | 200 | ||||
| -rw-r--r-- | arch/s390/kernel/machine_kexec.c | 9 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/swsusp_asm64.S | 3 | ||||
| -rw-r--r-- | arch/s390/kernel/traps.c | 2 |
9 files changed, 255 insertions, 31 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index d0a48268eb27..b21595090499 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -23,7 +23,7 @@ CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w 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) diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 6848828b962e..19e5e9eba546 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -2,8 +2,8 @@ * 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) * @@ -167,6 +167,7 @@ static debug_info_t *debug_area_last = NULL; static DEFINE_MUTEX(debug_mutex); static int initialized; +static int debug_critical; static const struct file_operations debug_file_ops = { .owner = THIS_MODULE, @@ -932,6 +933,11 @@ debug_stop_all(void) } +void debug_set_critical(void) +{ + debug_critical = 1; +} + /* * debug_event_common: * - write debug entry with given size @@ -945,7 +951,11 @@ debug_event_common(debug_info_t * id, int level, const void *buf, int len) 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)); @@ -968,7 +978,11 @@ debug_entry_t 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)); @@ -1013,7 +1027,11 @@ debug_sprintf_event(debug_info_t* id, int level,char *string,...) 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); @@ -1047,7 +1065,11 @@ debug_sprintf_exception(debug_info_t* id, int level,char *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); @@ -1428,10 +1450,10 @@ debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, 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; diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 52098d6dfaa7..578eb4e6d157 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -29,6 +29,7 @@ #include <asm/sysinfo.h> #include <asm/cpcmd.h> #include <asm/sclp.h> +#include <asm/system.h> #include "entry.h" /* @@ -262,25 +263,8 @@ static noinline __init void setup_lowcore_early(void) 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) diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 9e2f6f7c0e5a..153e21ce2336 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -17,6 +17,7 @@ #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> @@ -26,6 +27,7 @@ #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 @@ -1692,6 +1694,7 @@ static struct kobj_attribute on_panic_attr = static void do_panic(void) { + lgr_info_log(); on_panic_trigger.action->fn(&on_panic_trigger); stop_run(&on_panic_trigger); } @@ -1729,6 +1732,9 @@ static void __do_restart(void *ignore) void do_restart(void) { + tracing_off(); + debug_locks_off(); + lgr_info_log(); smp_call_online_cpu(__do_restart, NULL); } diff --git a/arch/s390/kernel/lgr.c b/arch/s390/kernel/lgr.c new file mode 100644 index 000000000000..8431b92ca3ae --- /dev/null +++ b/arch/s390/kernel/lgr.c @@ -0,0 +1,200 @@ +/* + * 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); diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index bf6fbc03ebaf..0f8cdf1268d0 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -14,6 +14,7 @@ #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> @@ -209,10 +210,14 @@ static void __machine_kexec(void *data) 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)); } diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 734e644972ab..d15b6c937088 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -40,6 +40,7 @@ #include <asm/lowcore.h> #include <asm/sclp.h> #include <asm/vdso.h> +#include <asm/debug.h> #include "entry.h" enum { @@ -406,6 +407,7 @@ void smp_send_stop(void) __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); diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S index ad3c79eceed7..dd70ef046058 100644 --- a/arch/s390/kernel/swsusp_asm64.S +++ b/arch/s390/kernel/swsusp_asm64.S @@ -257,6 +257,9 @@ restore_registers: 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 diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 5ce3750b181f..8894ac435d8d 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -41,6 +41,7 @@ #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); @@ -239,6 +240,7 @@ void die(struct pt_regs *regs, const char *str) static int die_counter; oops_enter(); + lgr_info_log(); debug_stop_all(); console_verbose(); spin_lock_irq(&die_lock); |