diff options
Diffstat (limited to 'module/spl/spl-debug.c')
| -rw-r--r-- | module/spl/spl-debug.c | 1265 |
1 files changed, 0 insertions, 1265 deletions
diff --git a/module/spl/spl-debug.c b/module/spl/spl-debug.c deleted file mode 100644 index 6c4e043f0..000000000 --- a/module/spl/spl-debug.c +++ /dev/null @@ -1,1265 +0,0 @@ -/*****************************************************************************\ - * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. - * Copyright (C) 2007 The Regents of the University of California. - * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). - * Written by Brian Behlendorf <[email protected]>. - * UCRL-CODE-235197 - * - * This file is part of the SPL, Solaris Porting Layer. - * For details, see <http://zfsonlinux.org/>. - * - * The SPL is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * The SPL is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License along - * with the SPL. If not, see <http://www.gnu.org/licenses/>. - ***************************************************************************** - * Solaris Porting Layer (SPL) Debug Implementation. -\*****************************************************************************/ - -#include <linux/kmod.h> -#include <linux/mm.h> -#include <linux/vmalloc.h> -#include <linux/pagemap.h> -#include <linux/slab.h> -#include <linux/ctype.h> -#include <linux/kthread.h> -#include <linux/hardirq.h> -#include <linux/interrupt.h> -#include <linux/spinlock.h> -#include <linux/proc_compat.h> -#include <linux/file_compat.h> -#include <linux/swap.h> -#include <linux/ratelimit.h> -#include <sys/sysmacros.h> -#include <sys/thread.h> -#include <spl-debug.h> -#include <spl-trace.h> -#include <spl-ctl.h> - -#ifdef SS_DEBUG_SUBSYS -#undef SS_DEBUG_SUBSYS -#endif - -#define SS_DEBUG_SUBSYS SS_DEBUG - -/* Debug log support enabled */ -#ifdef DEBUG_LOG - -unsigned long spl_debug_subsys = ~0; -EXPORT_SYMBOL(spl_debug_subsys); -module_param(spl_debug_subsys, ulong, 0644); -MODULE_PARM_DESC(spl_debug_subsys, "Subsystem debugging level mask."); - -unsigned long spl_debug_mask = SD_CANTMASK; -EXPORT_SYMBOL(spl_debug_mask); -module_param(spl_debug_mask, ulong, 0644); -MODULE_PARM_DESC(spl_debug_mask, "Debugging level mask."); - -unsigned long spl_debug_printk = SD_CANTMASK; -EXPORT_SYMBOL(spl_debug_printk); -module_param(spl_debug_printk, ulong, 0644); -MODULE_PARM_DESC(spl_debug_printk, "Console printk level mask."); - -int spl_debug_mb = -1; -EXPORT_SYMBOL(spl_debug_mb); -module_param(spl_debug_mb, int, 0644); -MODULE_PARM_DESC(spl_debug_mb, "Total debug buffer size."); - -unsigned int spl_debug_binary = 1; -EXPORT_SYMBOL(spl_debug_binary); - -unsigned int spl_debug_catastrophe; -EXPORT_SYMBOL(spl_debug_catastrophe); - -unsigned int spl_debug_panic_on_bug = 0; -EXPORT_SYMBOL(spl_debug_panic_on_bug); -module_param(spl_debug_panic_on_bug, uint, 0644); -MODULE_PARM_DESC(spl_debug_panic_on_bug, "Panic on BUG"); - -static char spl_debug_file_name[PATH_MAX]; -char spl_debug_file_path[PATH_MAX] = "/tmp/spl-log"; - -unsigned int spl_console_ratelimit = 1; -EXPORT_SYMBOL(spl_console_ratelimit); - -long spl_console_max_delay; -EXPORT_SYMBOL(spl_console_max_delay); - -long spl_console_min_delay; -EXPORT_SYMBOL(spl_console_min_delay); - -unsigned int spl_console_backoff = SPL_DEFAULT_BACKOFF; -EXPORT_SYMBOL(spl_console_backoff); - -unsigned int spl_debug_stack; -EXPORT_SYMBOL(spl_debug_stack); - -static int spl_panic_in_progress; - -union trace_data_union (*trace_data[TCD_TYPE_MAX])[NR_CPUS] __cacheline_aligned; -char *trace_console_buffers[NR_CPUS][3]; -struct rw_semaphore trace_sem; -atomic_t trace_tage_allocated = ATOMIC_INIT(0); - -static int spl_debug_dump_all_pages(dumplog_priv_t *dp, char *); -static void trace_fini(void); - - -/* Memory percentage breakdown by type */ -static unsigned int pages_factor[TCD_TYPE_MAX] = { - 80, /* 80% pages for TCD_TYPE_PROC */ - 10, /* 10% pages for TCD_TYPE_SOFTIRQ */ - 10 /* 10% pages for TCD_TYPE_IRQ */ -}; - -const char * -spl_debug_subsys2str(int subsys) -{ - switch (subsys) { - default: - return NULL; - case SS_UNDEFINED: - return "undefined"; - case SS_ATOMIC: - return "atomic"; - case SS_KOBJ: - return "kobj"; - case SS_VNODE: - return "vnode"; - case SS_TIME: - return "time"; - case SS_RWLOCK: - return "rwlock"; - case SS_THREAD: - return "thread"; - case SS_CONDVAR: - return "condvar"; - case SS_MUTEX: - return "mutex"; - case SS_RNG: - return "rng"; - case SS_TASKQ: - return "taskq"; - case SS_KMEM: - return "kmem"; - case SS_DEBUG: - return "debug"; - case SS_GENERIC: - return "generic"; - case SS_PROC: - return "proc"; - case SS_MODULE: - return "module"; - case SS_CRED: - return "cred"; - case SS_KSTAT: - return "kstat"; - case SS_XDR: - return "xdr"; - case SS_TSD: - return "tsd"; - case SS_ZLIB: - return "zlib"; - case SS_USER1: - return "user1"; - case SS_USER2: - return "user2"; - case SS_USER3: - return "user3"; - case SS_USER4: - return "user4"; - case SS_USER5: - return "user5"; - case SS_USER6: - return "user6"; - case SS_USER7: - return "user7"; - case SS_USER8: - return "user8"; - } -} - -const char * -spl_debug_dbg2str(int debug) -{ - switch (debug) { - default: - return NULL; - case SD_TRACE: - return "trace"; - case SD_INFO: - return "info"; - case SD_WARNING: - return "warning"; - case SD_ERROR: - return "error"; - case SD_EMERG: - return "emerg"; - case SD_CONSOLE: - return "console"; - case SD_IOCTL: - return "ioctl"; - case SD_DPRINTF: - return "dprintf"; - case SD_OTHER: - return "other"; - } -} - -int -spl_debug_mask2str(char *str, int size, unsigned long mask, int is_subsys) -{ - const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : - spl_debug_dbg2str; - const char *token; - int i, bit, len = 0; - - if (mask == 0) { /* "0" */ - if (size > 0) - str[0] = '0'; - len = 1; - } else { /* space-separated tokens */ - for (i = 0; i < 32; i++) { - bit = 1 << i; - - if ((mask & bit) == 0) - continue; - - token = fn(bit); - if (token == NULL) /* unused bit */ - continue; - - if (len > 0) { /* separator? */ - if (len < size) - str[len] = ' '; - len++; - } - - while (*token != 0) { - if (len < size) - str[len] = *token; - token++; - len++; - } - } - } - - /* terminate 'str' */ - if (len < size) - str[len] = 0; - else - str[size - 1] = 0; - - return len; -} - -static int -spl_debug_token2mask(int *mask, const char *str, int len, int is_subsys) -{ - const char *(*fn)(int bit) = is_subsys ? spl_debug_subsys2str : - spl_debug_dbg2str; - const char *token; - int i, j, bit; - - /* match against known tokens */ - for (i = 0; i < 32; i++) { - bit = 1 << i; - - token = fn(bit); - if (token == NULL) /* unused? */ - continue; - - /* strcasecmp */ - for (j = 0; ; j++) { - if (j == len) { /* end of token */ - if (token[j] == 0) { - *mask = bit; - return 0; - } - break; - } - - if (token[j] == 0) - break; - - if (str[j] == token[j]) - continue; - - if (str[j] < 'A' || 'Z' < str[j]) - break; - - if (str[j] - 'A' + 'a' != token[j]) - break; - } - } - - return -EINVAL; /* no match */ -} - -int -spl_debug_str2mask(unsigned long *mask, const char *str, int is_subsys) -{ - char op = 0; - int m = 0, matched, n, t; - - /* Allow a number for backwards compatibility */ - for (n = strlen(str); n > 0; n--) - if (!isspace(str[n-1])) - break; - matched = n; - - if ((t = sscanf(str, "%i%n", &m, &matched)) >= 1 && matched == n) { - *mask = m; - return 0; - } - - /* <str> must be a list of debug tokens or numbers separated by - * whitespace and optionally an operator ('+' or '-'). If an operator - * appears first in <str>, '*mask' is used as the starting point - * (relative), otherwise 0 is used (absolute). An operator applies to - * all following tokens up to the next operator. */ - matched = 0; - while (*str != 0) { - while (isspace(*str)) /* skip whitespace */ - str++; - - if (*str == 0) - break; - - if (*str == '+' || *str == '-') { - op = *str++; - - /* op on first token == relative */ - if (!matched) - m = *mask; - - while (isspace(*str)) /* skip whitespace */ - str++; - - if (*str == 0) /* trailing op */ - return -EINVAL; - } - - /* find token length */ - for (n = 0; str[n] != 0 && !isspace(str[n]); n++); - - /* match token */ - if (spl_debug_token2mask(&t, str, n, is_subsys) != 0) - return -EINVAL; - - matched = 1; - if (op == '-') - m &= ~t; - else - m |= t; - - str += n; - } - - if (!matched) - return -EINVAL; - - *mask = m; - return 0; -} - -static void -spl_debug_dumplog_internal(dumplog_priv_t *dp) -{ - void *journal_info; - - journal_info = current->journal_info; - current->journal_info = NULL; - - snprintf(spl_debug_file_name, sizeof(spl_debug_file_path) - 1, - "%s.%ld.%ld", spl_debug_file_path, - get_seconds(), (long)dp->dp_pid); - printk("SPL: Dumping log to %s\n", spl_debug_file_name); - spl_debug_dump_all_pages(dp, spl_debug_file_name); - - current->journal_info = journal_info; -} - -static int -spl_debug_dumplog_thread(void *arg) -{ - dumplog_priv_t *dp = (dumplog_priv_t *)arg; - - spl_debug_dumplog_internal(dp); - atomic_set(&dp->dp_done, 1); - wake_up(&dp->dp_waitq); - complete_and_exit(NULL, 0); - - return 0; /* Unreachable */ -} - -/* When flag is set do not use a new thread for the debug dump */ -int -spl_debug_dumplog(int flags) -{ - struct task_struct *tsk; - dumplog_priv_t dp; - - init_waitqueue_head(&dp.dp_waitq); - dp.dp_pid = current->pid; - dp.dp_flags = flags; - atomic_set(&dp.dp_done, 0); - - if (dp.dp_flags & DL_NOTHREAD) { - spl_debug_dumplog_internal(&dp); - } else { - - tsk = spl_kthread_create(spl_debug_dumplog_thread,(void *)&dp,"spl_debug"); - if (tsk == NULL) - return -ENOMEM; - - wake_up_process(tsk); - wait_event(dp.dp_waitq, atomic_read(&dp.dp_done)); - } - - return 0; -} -EXPORT_SYMBOL(spl_debug_dumplog); - -static char * -trace_get_console_buffer(void) -{ - int cpu = get_cpu(); - int idx; - - if (in_irq()) { - idx = 0; - } else if (in_softirq()) { - idx = 1; - } else { - idx = 2; - } - - return trace_console_buffers[cpu][idx]; -} - -static void -trace_put_console_buffer(char *buffer) -{ - put_cpu(); -} - -static int -trace_lock_tcd(struct trace_cpu_data *tcd) -{ - __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); - - spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags); - - return 1; -} - -static void -trace_unlock_tcd(struct trace_cpu_data *tcd) -{ - __ASSERT(tcd->tcd_type < TCD_TYPE_MAX); - - spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags); -} - -static struct trace_cpu_data * -trace_get_tcd(void) -{ - int cpu; - struct trace_cpu_data *tcd; - - cpu = get_cpu(); - if (in_irq()) - tcd = &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd; - else if (in_softirq()) - tcd = &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd; - else - tcd = &(*trace_data[TCD_TYPE_PROC])[cpu].tcd; - - trace_lock_tcd(tcd); - - return tcd; -} - -static void -trace_put_tcd (struct trace_cpu_data *tcd) -{ - trace_unlock_tcd(tcd); - - put_cpu(); -} - -static void -trace_set_debug_header(struct spl_debug_header *header, int subsys, - int mask, const int line, unsigned long stack) -{ - struct timeval tv; - - do_gettimeofday(&tv); - - header->ph_subsys = subsys; - header->ph_mask = mask; - header->ph_cpu_id = smp_processor_id(); - header->ph_sec = (__u32)tv.tv_sec; - header->ph_usec = tv.tv_usec; - header->ph_stack = stack; - header->ph_pid = current->pid; - header->ph_line_num = line; - - return; -} - -static void -trace_print_to_console(struct spl_debug_header *hdr, int mask, const char *buf, - int len, const char *file, const char *fn) -{ - char *prefix = "SPL", *ptype = NULL; - - if ((mask & SD_EMERG) != 0) { - prefix = "SPLError"; - ptype = KERN_EMERG; - } else if ((mask & SD_ERROR) != 0) { - prefix = "SPLError"; - ptype = KERN_ERR; - } else if ((mask & SD_WARNING) != 0) { - prefix = "SPL"; - ptype = KERN_WARNING; - } else if ((mask & (SD_CONSOLE | spl_debug_printk)) != 0) { - prefix = "SPL"; - ptype = KERN_INFO; - } - - if ((mask & SD_CONSOLE) != 0) { - printk("%s%s: %.*s", ptype, prefix, len, buf); - } else { - printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, - hdr->ph_pid, hdr->ph_stack, file, - hdr->ph_line_num, fn, len, buf); - } - - return; -} - -static int -trace_max_debug_mb(void) -{ - return MAX(512, ((totalram_pages >> (20 - PAGE_SHIFT)) * 80) / 100); -} - -static struct trace_page * -tage_alloc(int gfp) -{ - struct page *page; - struct trace_page *tage; - - page = alloc_pages(gfp | __GFP_NOWARN, 0); - if (page == NULL) - return NULL; - - tage = kmalloc(sizeof(*tage), gfp); - if (tage == NULL) { - __free_pages(page, 0); - return NULL; - } - - tage->page = page; - atomic_inc(&trace_tage_allocated); - - return tage; -} - -static void -tage_free(struct trace_page *tage) -{ - __ASSERT(tage != NULL); - __ASSERT(tage->page != NULL); - - __free_pages(tage->page, 0); - kfree(tage); - atomic_dec(&trace_tage_allocated); -} - -static struct trace_page * -tage_from_list(struct list_head *list) -{ - return list_entry(list, struct trace_page, linkage); -} - -static void -tage_to_tail(struct trace_page *tage, struct list_head *queue) -{ - __ASSERT(tage != NULL); - __ASSERT(queue != NULL); - - list_move_tail(&tage->linkage, queue); -} - -/* try to return a page that has 'len' bytes left at the end */ -static struct trace_page * -trace_get_tage_try(struct trace_cpu_data *tcd, unsigned long len) -{ - struct trace_page *tage; - - if (tcd->tcd_cur_pages > 0) { - __ASSERT(!list_empty(&tcd->tcd_pages)); - tage = tage_from_list(tcd->tcd_pages.prev); - if (tage->used + len <= PAGE_SIZE) - return tage; - } - - if (tcd->tcd_cur_pages < tcd->tcd_max_pages) { - if (tcd->tcd_cur_stock_pages > 0) { - tage = tage_from_list(tcd->tcd_stock_pages.prev); - tcd->tcd_cur_stock_pages--; - list_del_init(&tage->linkage); - } else { - tage = tage_alloc(GFP_ATOMIC); - if (tage == NULL) { - printk(KERN_WARNING - "failure to allocate a tage (%ld)\n", - tcd->tcd_cur_pages); - return NULL; - } - } - - tage->used = 0; - tage->cpu = smp_processor_id(); - tage->type = tcd->tcd_type; - list_add_tail(&tage->linkage, &tcd->tcd_pages); - tcd->tcd_cur_pages++; - - return tage; - } - - return NULL; -} - -/* return a page that has 'len' bytes left at the end */ -static struct trace_page * -trace_get_tage(struct trace_cpu_data *tcd, unsigned long len) -{ - struct trace_page *tage; - - __ASSERT(len <= PAGE_SIZE); - - tage = trace_get_tage_try(tcd, len); - if (tage) - return tage; - - if (tcd->tcd_cur_pages > 0) { - tage = tage_from_list(tcd->tcd_pages.next); - tage->used = 0; - tage_to_tail(tage, &tcd->tcd_pages); - } - - return tage; -} - -int -spl_debug_msg(void *arg, int subsys, int mask, const char *file, - const char *fn, const int line, const char *format, ...) -{ - spl_debug_limit_state_t *cdls = arg; - struct trace_cpu_data *tcd = NULL; - struct spl_debug_header header = { 0, }; - struct trace_page *tage; - /* string_buf is used only if tcd != NULL, and is always set then */ - char *string_buf = NULL; - char *debug_buf; - int known_size; - int needed = 85; /* average message length */ - int max_nob; - va_list ap; - int i; - - if (subsys == 0) - subsys = SS_DEBUG_SUBSYS; - - if (mask == 0) - mask = SD_EMERG; - - if (strchr(file, '/')) - file = strrchr(file, '/') + 1; - - tcd = trace_get_tcd(); - trace_set_debug_header(&header, subsys, mask, line, 0); - if (tcd == NULL) - goto console; - - if (tcd->tcd_shutting_down) { - trace_put_tcd(tcd); - tcd = NULL; - goto console; - } - - known_size = strlen(file) + 1; - if (fn) - known_size += strlen(fn) + 1; - - if (spl_debug_binary) - known_size += sizeof(header); - - /* '2' used because vsnprintf returns real size required for output - * _without_ terminating NULL. */ - for (i = 0; i < 2; i++) { - tage = trace_get_tage(tcd, needed + known_size + 1); - if (tage == NULL) { - if (needed + known_size > PAGE_SIZE) - mask |= SD_ERROR; - - trace_put_tcd(tcd); - tcd = NULL; - goto console; - } - - string_buf = (char *)page_address(tage->page) + - tage->used + known_size; - - max_nob = PAGE_SIZE - tage->used - known_size; - if (max_nob <= 0) { - printk(KERN_EMERG "negative max_nob: %i\n", max_nob); - mask |= SD_ERROR; - trace_put_tcd(tcd); - tcd = NULL; - goto console; - } - - needed = 0; - if (format) { - va_start(ap, format); - needed += vsnprintf(string_buf, max_nob, format, ap); - va_end(ap); - } - - if (needed < max_nob) - break; - } - - header.ph_len = known_size + needed; - debug_buf = (char *)page_address(tage->page) + tage->used; - - if (spl_debug_binary) { - memcpy(debug_buf, &header, sizeof(header)); - tage->used += sizeof(header); - debug_buf += sizeof(header); - } - - strcpy(debug_buf, file); - tage->used += strlen(file) + 1; - debug_buf += strlen(file) + 1; - - if (fn) { - strcpy(debug_buf, fn); - tage->used += strlen(fn) + 1; - debug_buf += strlen(fn) + 1; - } - - __ASSERT(debug_buf == string_buf); - - tage->used += needed; - __ASSERT (tage->used <= PAGE_SIZE); - -console: - if ((mask & spl_debug_printk) == 0) { - /* no console output requested */ - if (tcd != NULL) - trace_put_tcd(tcd); - return 1; - } - - if (cdls != NULL) { - if (spl_console_ratelimit && cdls->cdls_next != 0 && - !time_before(cdls->cdls_next, jiffies)) { - /* skipping a console message */ - cdls->cdls_count++; - if (tcd != NULL) - trace_put_tcd(tcd); - return 1; - } - - if (time_before(cdls->cdls_next + spl_console_max_delay + - (10 * HZ), jiffies)) { - /* last timeout was a long time ago */ - cdls->cdls_delay /= spl_console_backoff * 4; - } else { - cdls->cdls_delay *= spl_console_backoff; - - if (cdls->cdls_delay < spl_console_min_delay) - cdls->cdls_delay = spl_console_min_delay; - else if (cdls->cdls_delay > spl_console_max_delay) - cdls->cdls_delay = spl_console_max_delay; - } - - /* ensure cdls_next is never zero after it's been seen */ - cdls->cdls_next = (jiffies + cdls->cdls_delay) | 1; - } - - if (tcd != NULL) { - trace_print_to_console(&header, mask, string_buf, needed, file, fn); - trace_put_tcd(tcd); - } else { - string_buf = trace_get_console_buffer(); - - needed = 0; - if (format != NULL) { - va_start(ap, format); - needed += vsnprintf(string_buf, - TRACE_CONSOLE_BUFFER_SIZE, format, ap); - va_end(ap); - } - trace_print_to_console(&header, mask, - string_buf, needed, file, fn); - - trace_put_console_buffer(string_buf); - } - - if (cdls != NULL && cdls->cdls_count != 0) { - string_buf = trace_get_console_buffer(); - - needed = snprintf(string_buf, TRACE_CONSOLE_BUFFER_SIZE, - "Skipped %d previous similar message%s\n", - cdls->cdls_count, (cdls->cdls_count > 1) ? "s" : ""); - - trace_print_to_console(&header, mask, - string_buf, needed, file, fn); - - trace_put_console_buffer(string_buf); - cdls->cdls_count = 0; - } - - return 0; -} -EXPORT_SYMBOL(spl_debug_msg); - -/* Do the collect_pages job on a single CPU: assumes that all other - * CPUs have been stopped during a panic. If this isn't true for - * some arch, this will have to be implemented separately in each arch. - */ -static void -collect_pages_from_single_cpu(struct page_collection *pc) -{ - struct trace_cpu_data *tcd; - int i, j; - - tcd_for_each(tcd, i, j) { - list_splice_init(&tcd->tcd_pages, &pc->pc_pages); - tcd->tcd_cur_pages = 0; - } -} - -static void -collect_pages_on_all_cpus(struct page_collection *pc) -{ - struct trace_cpu_data *tcd; - int i, cpu; - - spin_lock(&pc->pc_lock); - for_each_possible_cpu(cpu) { - tcd_for_each_type_lock(tcd, i, cpu) { - list_splice_init(&tcd->tcd_pages, &pc->pc_pages); - tcd->tcd_cur_pages = 0; - } - } - spin_unlock(&pc->pc_lock); -} - -static void -collect_pages(dumplog_priv_t *dp, struct page_collection *pc) -{ - INIT_LIST_HEAD(&pc->pc_pages); - - if (spl_panic_in_progress || dp->dp_flags & DL_SINGLE_CPU) - collect_pages_from_single_cpu(pc); - else - collect_pages_on_all_cpus(pc); -} - -static void -put_pages_back_on_all_cpus(struct page_collection *pc) -{ - struct trace_cpu_data *tcd; - struct list_head *cur_head; - struct trace_page *tage; - struct trace_page *tmp; - int i, cpu; - - spin_lock(&pc->pc_lock); - - for_each_possible_cpu(cpu) { - tcd_for_each_type_lock(tcd, i, cpu) { - cur_head = tcd->tcd_pages.next; - - list_for_each_entry_safe(tage, tmp, &pc->pc_pages, - linkage) { - if (tage->cpu != cpu || tage->type != i) - continue; - - tage_to_tail(tage, cur_head); - tcd->tcd_cur_pages++; - } - } - } - - spin_unlock(&pc->pc_lock); -} - -static void -put_pages_back(struct page_collection *pc) -{ - if (!spl_panic_in_progress) - put_pages_back_on_all_cpus(pc); -} - -static int -spl_debug_dump_all_pages(dumplog_priv_t *dp, char *filename) -{ - struct page_collection pc; - struct file *filp; - struct trace_page *tage; - struct trace_page *tmp; - mm_segment_t oldfs; - int rc = 0; - - down_write(&trace_sem); - - filp = spl_filp_open(filename, O_CREAT|O_EXCL|O_WRONLY|O_LARGEFILE, - 0600, &rc); - if (filp == NULL) { - if (rc != -EEXIST) - printk(KERN_ERR "SPL: Can't open %s for dump: %d\n", - filename, rc); - goto out; - } - - spin_lock_init(&pc.pc_lock); - collect_pages(dp, &pc); - if (list_empty(&pc.pc_pages)) { - rc = 0; - goto close; - } - - oldfs = get_fs(); - set_fs(get_ds()); - - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { - rc = spl_filp_write(filp, page_address(tage->page), - tage->used, spl_filp_poff(filp)); - if (rc != (int)tage->used) { - printk(KERN_WARNING "SPL: Wanted to write %u " - "but wrote %d\n", tage->used, rc); - put_pages_back(&pc); - __ASSERT(list_empty(&pc.pc_pages)); - break; - } - list_del(&tage->linkage); - tage_free(tage); - } - - set_fs(oldfs); - - rc = spl_filp_fsync(filp, 1); - if (rc) - printk(KERN_ERR "SPL: Unable to sync: %d\n", rc); - close: - spl_filp_close(filp); - out: - up_write(&trace_sem); - - return rc; -} - -static void -spl_debug_flush_pages(void) -{ - dumplog_priv_t dp; - struct page_collection pc; - struct trace_page *tage; - struct trace_page *tmp; - - spin_lock_init(&pc.pc_lock); - init_waitqueue_head(&dp.dp_waitq); - dp.dp_pid = current->pid; - dp.dp_flags = 0; - atomic_set(&dp.dp_done, 0); - - collect_pages(&dp, &pc); - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { - list_del(&tage->linkage); - tage_free(tage); - } -} - -unsigned long -spl_debug_set_mask(unsigned long mask) { - spl_debug_mask = mask; - return 0; -} -EXPORT_SYMBOL(spl_debug_set_mask); - -unsigned long -spl_debug_get_mask(void) { - return spl_debug_mask; -} -EXPORT_SYMBOL(spl_debug_get_mask); - -unsigned long -spl_debug_set_subsys(unsigned long subsys) { - spl_debug_subsys = subsys; - return 0; -} -EXPORT_SYMBOL(spl_debug_set_subsys); - -unsigned long -spl_debug_get_subsys(void) { - return spl_debug_subsys; -} -EXPORT_SYMBOL(spl_debug_get_subsys); - -int -spl_debug_set_mb(int mb) -{ - int i, j, pages; - int limit = trace_max_debug_mb(); - struct trace_cpu_data *tcd; - - if (mb < num_possible_cpus()) { - printk(KERN_ERR "SPL: Refusing to set debug buffer size to " - "%dMB - lower limit is %d\n", mb, num_possible_cpus()); - return -EINVAL; - } - - if (mb > limit) { - printk(KERN_ERR "SPL: Refusing to set debug buffer size to " - "%dMB - upper limit is %d\n", mb, limit); - return -EINVAL; - } - - mb /= num_possible_cpus(); - pages = mb << (20 - PAGE_SHIFT); - - down_write(&trace_sem); - - tcd_for_each(tcd, i, j) - tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100; - - up_write(&trace_sem); - - return 0; -} -EXPORT_SYMBOL(spl_debug_set_mb); - -int -spl_debug_get_mb(void) -{ - int i, j; - struct trace_cpu_data *tcd; - int total_pages = 0; - - down_read(&trace_sem); - - tcd_for_each(tcd, i, j) - total_pages += tcd->tcd_max_pages; - - up_read(&trace_sem); - - return (total_pages >> (20 - PAGE_SHIFT)) + 1; -} -EXPORT_SYMBOL(spl_debug_get_mb); - -/* - * Limit the number of stack traces dumped to not more than 5 every - * 60 seconds to prevent denial-of-service attacks from debug code. - */ -DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5); - -void -spl_debug_dumpstack(struct task_struct *tsk) -{ - if (__ratelimit(&dumpstack_ratelimit_state)) { - if (tsk == NULL) - tsk = current; - - printk("SPL: Showing stack for process %d\n", tsk->pid); - dump_stack(); - } -} -EXPORT_SYMBOL(spl_debug_dumpstack); - -void spl_debug_bug(char *file, const char *func, const int line, int flags) -{ - spl_debug_catastrophe = 1; - spl_debug_msg(NULL, 0, SD_EMERG, file, func, line, "SPL PANIC\n"); - - if (in_interrupt()) - panic("SPL PANIC in interrupt.\n"); - - if (in_atomic() || irqs_disabled()) - flags |= DL_NOTHREAD; - - /* Ensure all debug pages and dumped by current cpu */ - if (spl_debug_panic_on_bug) - spl_panic_in_progress = 1; - - spl_debug_dumpstack(NULL); - - if (spl_debug_panic_on_bug) { - spl_debug_dumplog(flags); - panic("SPL PANIC"); - } - - set_task_state(current, TASK_UNINTERRUPTIBLE); - while (1) - schedule(); -} -EXPORT_SYMBOL(spl_debug_bug); - -int -spl_debug_clear_buffer(void) -{ - spl_debug_flush_pages(); - return 0; -} -EXPORT_SYMBOL(spl_debug_clear_buffer); - -int -spl_debug_mark_buffer(char *text) -{ - SDEBUG(SD_WARNING, "*************************************\n"); - SDEBUG(SD_WARNING, "DEBUG MARKER: %s\n", text); - SDEBUG(SD_WARNING, "*************************************\n"); - - return 0; -} -EXPORT_SYMBOL(spl_debug_mark_buffer); - -static int -trace_init(int max_pages) -{ - struct trace_cpu_data *tcd; - int i, j; - - init_rwsem(&trace_sem); - - /* initialize trace_data */ - memset(trace_data, 0, sizeof(trace_data)); - for (i = 0; i < TCD_TYPE_MAX; i++) { - trace_data[i] = kmalloc(sizeof(union trace_data_union) * - NR_CPUS, GFP_KERNEL); - if (trace_data[i] == NULL) - goto out; - } - - tcd_for_each(tcd, i, j) { - spin_lock_init(&tcd->tcd_lock); - tcd->tcd_pages_factor = pages_factor[i]; - tcd->tcd_type = i; - tcd->tcd_cpu = j; - INIT_LIST_HEAD(&tcd->tcd_pages); - INIT_LIST_HEAD(&tcd->tcd_stock_pages); - tcd->tcd_cur_pages = 0; - tcd->tcd_cur_stock_pages = 0; - tcd->tcd_max_pages = (max_pages * pages_factor[i]) / 100; - tcd->tcd_shutting_down = 0; - } - - for (i = 0; i < num_possible_cpus(); i++) { - for (j = 0; j < 3; j++) { - trace_console_buffers[i][j] = - kmalloc(TRACE_CONSOLE_BUFFER_SIZE, - GFP_KERNEL); - - if (trace_console_buffers[i][j] == NULL) - goto out; - } - } - - return 0; -out: - trace_fini(); - printk(KERN_ERR "SPL: Insufficient memory for debug logs\n"); - return -ENOMEM; -} - -int -spl_debug_init(void) -{ - int rc, max = spl_debug_mb; - - spl_console_max_delay = SPL_DEFAULT_MAX_DELAY; - spl_console_min_delay = SPL_DEFAULT_MIN_DELAY; - - /* If spl_debug_mb is set to an invalid value or uninitialized - * then just make the total buffers smp_num_cpus TCD_MAX_PAGES */ - if (max > (totalram_pages >> (20 - 2 - PAGE_SHIFT)) / 5 || - max >= 512 || max < 0) { - max = TCD_MAX_PAGES; - } else { - max = (max / num_online_cpus()) << (20 - PAGE_SHIFT); - } - - rc = trace_init(max); - if (rc) - return rc; - - return rc; -} - -static void -trace_cleanup_on_all_cpus(void) -{ - struct trace_cpu_data *tcd; - struct trace_page *tage; - struct trace_page *tmp; - int i, cpu; - - for_each_possible_cpu(cpu) { - tcd_for_each_type_lock(tcd, i, cpu) { - tcd->tcd_shutting_down = 1; - - list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, - linkage) { - list_del(&tage->linkage); - tage_free(tage); - } - tcd->tcd_cur_pages = 0; - } - } -} - -static void -trace_fini(void) -{ - int i, j; - - trace_cleanup_on_all_cpus(); - - for (i = 0; i < num_possible_cpus(); i++) { - for (j = 0; j < 3; j++) { - if (trace_console_buffers[i][j] != NULL) { - kfree(trace_console_buffers[i][j]); - trace_console_buffers[i][j] = NULL; - } - } - } - - for (i = 0; i < TCD_TYPE_MAX && trace_data[i] != NULL; i++) { - kfree(trace_data[i]); - trace_data[i] = NULL; - } -} - -void -spl_debug_fini(void) -{ - trace_fini(); -} - -#endif /* DEBUG_LOG */ |