/*****************************************************************************\ * 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 . * UCRL-CODE-235197 * * This file is part of the SPL, Solaris Porting Layer. * For details, see . * * 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 . ***************************************************************************** * Solaris Porting Layer (SPL) Debug Implementation. \*****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; } /* must be a list of debug tokens or numbers separated by * whitespace and optionally an operator ('+' or '-'). If an operator * appears first in , '*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 */