diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/libcfs/tracefile.c')
| -rw-r--r-- | drivers/staging/lustre/lnet/libcfs/tracefile.c | 1191 |
1 files changed, 0 insertions, 1191 deletions
diff --git a/drivers/staging/lustre/lnet/libcfs/tracefile.c b/drivers/staging/lustre/lnet/libcfs/tracefile.c deleted file mode 100644 index 4affca750bc5..000000000000 --- a/drivers/staging/lustre/lnet/libcfs/tracefile.c +++ /dev/null @@ -1,1191 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * GPL HEADER START - * - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 only, - * as published by the Free Software Foundation. - * - * This program 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 version 2 for more details (a copy is included - * in the LICENSE file that accompanied this code). - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; If not, see - * http://www.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2012, Intel Corporation. - */ -/* - * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. - * - * libcfs/libcfs/tracefile.c - * - * Author: Zach Brown <zab@clusterfs.com> - * Author: Phil Schwan <phil@clusterfs.com> - */ - -#define DEBUG_SUBSYSTEM S_LNET -#define LUSTRE_TRACEFILE_PRIVATE -#define pr_fmt(fmt) "Lustre: " fmt -#include "tracefile.h" - -#include <linux/libcfs/libcfs.h> - -/* XXX move things up to the top, comment */ -union cfs_trace_data_union (*cfs_trace_data[TCD_MAX_TYPES])[NR_CPUS] __cacheline_aligned; - -char cfs_tracefile[TRACEFILE_NAME_SIZE]; -long long cfs_tracefile_size = CFS_TRACEFILE_SIZE; -static struct tracefiled_ctl trace_tctl; -static DEFINE_MUTEX(cfs_trace_thread_mutex); -static int thread_running; - -static atomic_t cfs_tage_allocated = ATOMIC_INIT(0); - -struct page_collection { - struct list_head pc_pages; - /* - * if this flag is set, collect_pages() will spill both - * ->tcd_daemon_pages and ->tcd_pages to the ->pc_pages. Otherwise, - * only ->tcd_pages are spilled. - */ - int pc_want_daemon_pages; -}; - -struct tracefiled_ctl { - struct completion tctl_start; - struct completion tctl_stop; - wait_queue_head_t tctl_waitq; - pid_t tctl_pid; - atomic_t tctl_shutdown; -}; - -/* - * small data-structure for each page owned by tracefiled. - */ -struct cfs_trace_page { - /* - * page itself - */ - struct page *page; - /* - * linkage into one of the lists in trace_data_union or - * page_collection - */ - struct list_head linkage; - /* - * number of bytes used within this page - */ - unsigned int used; - /* - * cpu that owns this page - */ - unsigned short cpu; - /* - * type(context) of this page - */ - unsigned short type; -}; - -static void put_pages_on_tcd_daemon_list(struct page_collection *pc, - struct cfs_trace_cpu_data *tcd); - -static inline struct cfs_trace_page * -cfs_tage_from_list(struct list_head *list) -{ - return list_entry(list, struct cfs_trace_page, linkage); -} - -static struct cfs_trace_page *cfs_tage_alloc(gfp_t gfp) -{ - struct page *page; - struct cfs_trace_page *tage; - - /* My caller is trying to free memory */ - if (!in_interrupt() && memory_pressure_get()) - return NULL; - - /* - * Don't spam console with allocation failures: they will be reported - * by upper layer anyway. - */ - gfp |= __GFP_NOWARN; - page = alloc_page(gfp); - if (!page) - return NULL; - - tage = kmalloc(sizeof(*tage), gfp); - if (!tage) { - __free_page(page); - return NULL; - } - - tage->page = page; - atomic_inc(&cfs_tage_allocated); - return tage; -} - -static void cfs_tage_free(struct cfs_trace_page *tage) -{ - __free_page(tage->page); - kfree(tage); - atomic_dec(&cfs_tage_allocated); -} - -static void cfs_tage_to_tail(struct cfs_trace_page *tage, - struct list_head *queue) -{ - list_move_tail(&tage->linkage, queue); -} - -int cfs_trace_refill_stock(struct cfs_trace_cpu_data *tcd, gfp_t gfp, - struct list_head *stock) -{ - int i; - - /* - * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT) - * from here: this will lead to infinite recursion. - */ - - for (i = 0; i + tcd->tcd_cur_stock_pages < TCD_STOCK_PAGES ; ++i) { - struct cfs_trace_page *tage; - - tage = cfs_tage_alloc(gfp); - if (!tage) - break; - list_add_tail(&tage->linkage, stock); - } - return i; -} - -/* return a page that has 'len' bytes left at the end */ -static struct cfs_trace_page * -cfs_trace_get_tage_try(struct cfs_trace_cpu_data *tcd, unsigned long len) -{ - struct cfs_trace_page *tage; - - if (tcd->tcd_cur_pages > 0) { - __LASSERT(!list_empty(&tcd->tcd_pages)); - tage = cfs_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 = cfs_tage_from_list(tcd->tcd_stock_pages.prev); - --tcd->tcd_cur_stock_pages; - list_del_init(&tage->linkage); - } else { - tage = cfs_tage_alloc(GFP_ATOMIC); - if (unlikely(!tage)) { - if (!memory_pressure_get() || in_interrupt()) - pr_warn_ratelimited("cannot 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++; - - if (tcd->tcd_cur_pages > 8 && thread_running) { - struct tracefiled_ctl *tctl = &trace_tctl; - /* - * wake up tracefiled to process some pages. - */ - wake_up(&tctl->tctl_waitq); - } - return tage; - } - return NULL; -} - -static void cfs_tcd_shrink(struct cfs_trace_cpu_data *tcd) -{ - int pgcount = tcd->tcd_cur_pages / 10; - struct page_collection pc; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - - /* - * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT) - * from here: this will lead to infinite recursion. - */ - - pr_warn_ratelimited("debug daemon buffer overflowed; discarding 10%% of pages (%d of %ld)\n", - pgcount + 1, tcd->tcd_cur_pages); - - INIT_LIST_HEAD(&pc.pc_pages); - - list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, linkage) { - if (!pgcount--) - break; - - list_move_tail(&tage->linkage, &pc.pc_pages); - tcd->tcd_cur_pages--; - } - put_pages_on_tcd_daemon_list(&pc, tcd); -} - -/* return a page that has 'len' bytes left at the end */ -static struct cfs_trace_page *cfs_trace_get_tage(struct cfs_trace_cpu_data *tcd, - unsigned long len) -{ - struct cfs_trace_page *tage; - - /* - * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT) - * from here: this will lead to infinite recursion. - */ - - if (len > PAGE_SIZE) { - pr_err("cowardly refusing to write %lu bytes in a page\n", len); - return NULL; - } - - tage = cfs_trace_get_tage_try(tcd, len); - if (tage) - return tage; - if (thread_running) - cfs_tcd_shrink(tcd); - if (tcd->tcd_cur_pages > 0) { - tage = cfs_tage_from_list(tcd->tcd_pages.next); - tage->used = 0; - cfs_tage_to_tail(tage, &tcd->tcd_pages); - } - return tage; -} - -int libcfs_debug_msg(struct libcfs_debug_msg_data *msgdata, - const char *format, ...) -{ - va_list args; - int rc; - - va_start(args, format); - rc = libcfs_debug_vmsg2(msgdata, format, args, NULL); - va_end(args); - - return rc; -} -EXPORT_SYMBOL(libcfs_debug_msg); - -int libcfs_debug_vmsg2(struct libcfs_debug_msg_data *msgdata, - const char *format1, va_list args, - const char *format2, ...) -{ - struct cfs_trace_cpu_data *tcd = NULL; - struct ptldebug_header header = { 0 }; - struct cfs_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 depth; - int i; - int remain; - int mask = msgdata->msg_mask; - const char *file = kbasename(msgdata->msg_file); - struct cfs_debug_limit_state *cdls = msgdata->msg_cdls; - - tcd = cfs_trace_get_tcd(); - - /* cfs_trace_get_tcd() grabs a lock, which disables preemption and - * pins us to a particular CPU. This avoids an smp_processor_id() - * warning on Linux when debugging is enabled. - */ - cfs_set_ptldebug_header(&header, msgdata, CDEBUG_STACK()); - - if (!tcd) /* arch may not log in IRQ context */ - goto console; - - if (!tcd->tcd_cur_pages) - header.ph_flags |= PH_FLAG_FIRST_RECORD; - - if (tcd->tcd_shutting_down) { - cfs_trace_put_tcd(tcd); - tcd = NULL; - goto console; - } - - depth = __current_nesting_level(); - known_size = strlen(file) + 1 + depth; - if (msgdata->msg_fn) - known_size += strlen(msgdata->msg_fn) + 1; - - if (libcfs_debug_binary) - known_size += sizeof(header); - - /* - * '2' used because vsnprintf return real size required for output - * _without_ terminating NULL. - * if needed is to small for this format. - */ - for (i = 0; i < 2; i++) { - tage = cfs_trace_get_tage(tcd, needed + known_size + 1); - if (!tage) { - if (needed + known_size > PAGE_SIZE) - mask |= D_ERROR; - - cfs_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) { - pr_emerg("negative max_nob: %d\n", max_nob); - mask |= D_ERROR; - cfs_trace_put_tcd(tcd); - tcd = NULL; - goto console; - } - - needed = 0; - if (format1) { - va_copy(ap, args); - needed = vsnprintf(string_buf, max_nob, format1, ap); - va_end(ap); - } - - if (format2) { - remain = max_nob - needed; - if (remain < 0) - remain = 0; - - va_start(ap, format2); - needed += vsnprintf(string_buf + needed, remain, - format2, ap); - va_end(ap); - } - - if (needed < max_nob) /* well. printing ok.. */ - break; - } - - if (*(string_buf + needed - 1) != '\n') - pr_info("format at %s:%d:%s doesn't end in newline\n", file, - msgdata->msg_line, msgdata->msg_fn); - - header.ph_len = known_size + needed; - debug_buf = (char *)page_address(tage->page) + tage->used; - - if (libcfs_debug_binary) { - memcpy(debug_buf, &header, sizeof(header)); - tage->used += sizeof(header); - debug_buf += sizeof(header); - } - - /* indent message according to the nesting level */ - while (depth-- > 0) { - *(debug_buf++) = '.'; - ++tage->used; - } - - strcpy(debug_buf, file); - tage->used += strlen(file) + 1; - debug_buf += strlen(file) + 1; - - if (msgdata->msg_fn) { - strcpy(debug_buf, msgdata->msg_fn); - tage->used += strlen(msgdata->msg_fn) + 1; - debug_buf += strlen(msgdata->msg_fn) + 1; - } - - __LASSERT(debug_buf == string_buf); - - tage->used += needed; - __LASSERT(tage->used <= PAGE_SIZE); - -console: - if (!(mask & libcfs_printk)) { - /* no console output requested */ - if (tcd) - cfs_trace_put_tcd(tcd); - return 1; - } - - if (cdls) { - if (libcfs_console_ratelimit && - cdls->cdls_next && /* not first time ever */ - !cfs_time_after(cfs_time_current(), cdls->cdls_next)) { - /* skipping a console message */ - cdls->cdls_count++; - if (tcd) - cfs_trace_put_tcd(tcd); - return 1; - } - - if (cfs_time_after(cfs_time_current(), - cdls->cdls_next + libcfs_console_max_delay + - 10 * HZ)) { - /* last timeout was a long time ago */ - cdls->cdls_delay /= libcfs_console_backoff * 4; - } else { - cdls->cdls_delay *= libcfs_console_backoff; - } - - if (cdls->cdls_delay < libcfs_console_min_delay) - cdls->cdls_delay = libcfs_console_min_delay; - else if (cdls->cdls_delay > libcfs_console_max_delay) - cdls->cdls_delay = libcfs_console_max_delay; - - /* ensure cdls_next is never zero after it's been seen */ - cdls->cdls_next = (cfs_time_current() + cdls->cdls_delay) | 1; - } - - if (tcd) { - cfs_print_to_console(&header, mask, string_buf, needed, file, - msgdata->msg_fn); - cfs_trace_put_tcd(tcd); - } else { - string_buf = cfs_trace_get_console_buffer(); - - needed = 0; - if (format1) { - va_copy(ap, args); - needed = vsnprintf(string_buf, - CFS_TRACE_CONSOLE_BUFFER_SIZE, - format1, ap); - va_end(ap); - } - if (format2) { - remain = CFS_TRACE_CONSOLE_BUFFER_SIZE - needed; - if (remain > 0) { - va_start(ap, format2); - needed += vsnprintf(string_buf + needed, remain, - format2, ap); - va_end(ap); - } - } - cfs_print_to_console(&header, mask, - string_buf, needed, file, msgdata->msg_fn); - - put_cpu(); - } - - if (cdls && cdls->cdls_count) { - string_buf = cfs_trace_get_console_buffer(); - - needed = snprintf(string_buf, CFS_TRACE_CONSOLE_BUFFER_SIZE, - "Skipped %d previous similar message%s\n", - cdls->cdls_count, - (cdls->cdls_count > 1) ? "s" : ""); - - cfs_print_to_console(&header, mask, - string_buf, needed, file, msgdata->msg_fn); - - put_cpu(); - cdls->cdls_count = 0; - } - - return 0; -} -EXPORT_SYMBOL(libcfs_debug_vmsg2); - -void -cfs_trace_assertion_failed(const char *str, - struct libcfs_debug_msg_data *msgdata) -{ - struct ptldebug_header hdr; - - libcfs_panic_in_progress = 1; - libcfs_catastrophe = 1; - mb(); - - cfs_set_ptldebug_header(&hdr, msgdata, CDEBUG_STACK()); - - cfs_print_to_console(&hdr, D_EMERG, str, strlen(str), - msgdata->msg_file, msgdata->msg_fn); - - panic("Lustre debug assertion failure\n"); - - /* not reached */ -} - -static void -panic_collect_pages(struct page_collection *pc) -{ - /* 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. - */ - struct cfs_trace_cpu_data *tcd; - int i; - int j; - - INIT_LIST_HEAD(&pc->pc_pages); - - cfs_tcd_for_each(tcd, i, j) { - list_splice_init(&tcd->tcd_pages, &pc->pc_pages); - tcd->tcd_cur_pages = 0; - - if (pc->pc_want_daemon_pages) { - list_splice_init(&tcd->tcd_daemon_pages, &pc->pc_pages); - tcd->tcd_cur_daemon_pages = 0; - } - } -} - -static void collect_pages_on_all_cpus(struct page_collection *pc) -{ - struct cfs_trace_cpu_data *tcd; - int i, cpu; - - for_each_possible_cpu(cpu) { - cfs_tcd_for_each_type_lock(tcd, i, cpu) { - list_splice_init(&tcd->tcd_pages, &pc->pc_pages); - tcd->tcd_cur_pages = 0; - if (pc->pc_want_daemon_pages) { - list_splice_init(&tcd->tcd_daemon_pages, - &pc->pc_pages); - tcd->tcd_cur_daemon_pages = 0; - } - } - } -} - -static void collect_pages(struct page_collection *pc) -{ - INIT_LIST_HEAD(&pc->pc_pages); - - if (libcfs_panic_in_progress) - panic_collect_pages(pc); - else - collect_pages_on_all_cpus(pc); -} - -static void put_pages_back_on_all_cpus(struct page_collection *pc) -{ - struct cfs_trace_cpu_data *tcd; - struct list_head *cur_head; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - int i, cpu; - - for_each_possible_cpu(cpu) { - cfs_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) { - __LASSERT_TAGE_INVARIANT(tage); - - if (tage->cpu != cpu || tage->type != i) - continue; - - cfs_tage_to_tail(tage, cur_head); - tcd->tcd_cur_pages++; - } - } - } -} - -static void put_pages_back(struct page_collection *pc) -{ - if (!libcfs_panic_in_progress) - put_pages_back_on_all_cpus(pc); -} - -/* Add pages to a per-cpu debug daemon ringbuffer. This buffer makes sure that - * we have a good amount of data at all times for dumping during an LBUG, even - * if we have been steadily writing (and otherwise discarding) pages via the - * debug daemon. - */ -static void put_pages_on_tcd_daemon_list(struct page_collection *pc, - struct cfs_trace_cpu_data *tcd) -{ - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - - list_for_each_entry_safe(tage, tmp, &pc->pc_pages, linkage) { - __LASSERT_TAGE_INVARIANT(tage); - - if (tage->cpu != tcd->tcd_cpu || tage->type != tcd->tcd_type) - continue; - - cfs_tage_to_tail(tage, &tcd->tcd_daemon_pages); - tcd->tcd_cur_daemon_pages++; - - if (tcd->tcd_cur_daemon_pages > tcd->tcd_max_pages) { - struct cfs_trace_page *victim; - - __LASSERT(!list_empty(&tcd->tcd_daemon_pages)); - victim = cfs_tage_from_list(tcd->tcd_daemon_pages.next); - - __LASSERT_TAGE_INVARIANT(victim); - - list_del(&victim->linkage); - cfs_tage_free(victim); - tcd->tcd_cur_daemon_pages--; - } - } -} - -static void put_pages_on_daemon_list(struct page_collection *pc) -{ - struct cfs_trace_cpu_data *tcd; - int i, cpu; - - for_each_possible_cpu(cpu) { - cfs_tcd_for_each_type_lock(tcd, i, cpu) - put_pages_on_tcd_daemon_list(pc, tcd); - } -} - -void cfs_trace_debug_print(void) -{ - struct page_collection pc; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - - pc.pc_want_daemon_pages = 1; - collect_pages(&pc); - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { - char *p, *file, *fn; - struct page *page; - - __LASSERT_TAGE_INVARIANT(tage); - - page = tage->page; - p = page_address(page); - while (p < ((char *)page_address(page) + tage->used)) { - struct ptldebug_header *hdr; - int len; - - hdr = (void *)p; - p += sizeof(*hdr); - file = p; - p += strlen(file) + 1; - fn = p; - p += strlen(fn) + 1; - len = hdr->ph_len - (int)(p - (char *)hdr); - - cfs_print_to_console(hdr, D_EMERG, p, len, file, fn); - - p += len; - } - - list_del(&tage->linkage); - cfs_tage_free(tage); - } -} - -int cfs_tracefile_dump_all_pages(char *filename) -{ - struct page_collection pc; - struct file *filp; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - char *buf; - mm_segment_t __oldfs; - int rc; - - cfs_tracefile_write_lock(); - - filp = filp_open(filename, O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, - 0600); - if (IS_ERR(filp)) { - rc = PTR_ERR(filp); - filp = NULL; - pr_err("LustreError: can't open %s for dump: rc %d\n", - filename, rc); - goto out; - } - - pc.pc_want_daemon_pages = 1; - collect_pages(&pc); - if (list_empty(&pc.pc_pages)) { - rc = 0; - goto close; - } - __oldfs = get_fs(); - set_fs(get_ds()); - - /* ok, for now, just write the pages. in the future we'll be building - * iobufs with the pages and calling generic_direct_IO - */ - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { - __LASSERT_TAGE_INVARIANT(tage); - - buf = kmap(tage->page); - rc = kernel_write(filp, buf, tage->used, &filp->f_pos); - kunmap(tage->page); - - if (rc != (int)tage->used) { - pr_warn("wanted to write %u but wrote %d\n", tage->used, - rc); - put_pages_back(&pc); - __LASSERT(list_empty(&pc.pc_pages)); - break; - } - list_del(&tage->linkage); - cfs_tage_free(tage); - } - set_fs(__oldfs); - rc = vfs_fsync(filp, 1); - if (rc) - pr_err("sync returns %d\n", rc); -close: - filp_close(filp, NULL); -out: - cfs_tracefile_write_unlock(); - return rc; -} - -void cfs_trace_flush_pages(void) -{ - struct page_collection pc; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - - pc.pc_want_daemon_pages = 1; - collect_pages(&pc); - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { - __LASSERT_TAGE_INVARIANT(tage); - - list_del(&tage->linkage); - cfs_tage_free(tage); - } -} - -int cfs_trace_copyin_string(char *knl_buffer, int knl_buffer_nob, - const char __user *usr_buffer, int usr_buffer_nob) -{ - int nob; - - if (usr_buffer_nob > knl_buffer_nob) - return -EOVERFLOW; - - if (copy_from_user((void *)knl_buffer, - usr_buffer, usr_buffer_nob)) - return -EFAULT; - - nob = strnlen(knl_buffer, usr_buffer_nob); - while (--nob >= 0) /* strip trailing whitespace */ - if (!isspace(knl_buffer[nob])) - break; - - if (nob < 0) /* empty string */ - return -EINVAL; - - if (nob == knl_buffer_nob) /* no space to terminate */ - return -EOVERFLOW; - - knl_buffer[nob + 1] = 0; /* terminate */ - return 0; -} -EXPORT_SYMBOL(cfs_trace_copyin_string); - -int cfs_trace_copyout_string(char __user *usr_buffer, int usr_buffer_nob, - const char *knl_buffer, char *append) -{ - /* - * NB if 'append' != NULL, it's a single character to append to the - * copied out string - usually "\n" or "" (i.e. a terminating zero byte) - */ - int nob = strlen(knl_buffer); - - if (nob > usr_buffer_nob) - nob = usr_buffer_nob; - - if (copy_to_user(usr_buffer, knl_buffer, nob)) - return -EFAULT; - - if (append && nob < usr_buffer_nob) { - if (copy_to_user(usr_buffer + nob, append, 1)) - return -EFAULT; - - nob++; - } - - return nob; -} -EXPORT_SYMBOL(cfs_trace_copyout_string); - -int cfs_trace_allocate_string_buffer(char **str, int nob) -{ - if (nob > 2 * PAGE_SIZE) /* string must be "sensible" */ - return -EINVAL; - - *str = kmalloc(nob, GFP_KERNEL | __GFP_ZERO); - if (!*str) - return -ENOMEM; - - return 0; -} - -int cfs_trace_dump_debug_buffer_usrstr(void __user *usr_str, int usr_str_nob) -{ - char *str; - int rc; - - rc = cfs_trace_allocate_string_buffer(&str, usr_str_nob + 1); - if (rc) - return rc; - - rc = cfs_trace_copyin_string(str, usr_str_nob + 1, - usr_str, usr_str_nob); - if (rc) - goto out; - - if (str[0] != '/') { - rc = -EINVAL; - goto out; - } - rc = cfs_tracefile_dump_all_pages(str); -out: - kfree(str); - return rc; -} - -int cfs_trace_daemon_command(char *str) -{ - int rc = 0; - - cfs_tracefile_write_lock(); - - if (!strcmp(str, "stop")) { - cfs_tracefile_write_unlock(); - cfs_trace_stop_thread(); - cfs_tracefile_write_lock(); - memset(cfs_tracefile, 0, sizeof(cfs_tracefile)); - - } else if (!strncmp(str, "size=", 5)) { - unsigned long tmp; - - rc = kstrtoul(str + 5, 10, &tmp); - if (!rc) { - if (tmp < 10 || tmp > 20480) - cfs_tracefile_size = CFS_TRACEFILE_SIZE; - else - cfs_tracefile_size = tmp << 20; - } - } else if (strlen(str) >= sizeof(cfs_tracefile)) { - rc = -ENAMETOOLONG; - } else if (str[0] != '/') { - rc = -EINVAL; - } else { - strcpy(cfs_tracefile, str); - - pr_info("debug daemon will attempt to start writing to %s (%lukB max)\n", - cfs_tracefile, - (long)(cfs_tracefile_size >> 10)); - - cfs_trace_start_thread(); - } - - cfs_tracefile_write_unlock(); - return rc; -} - -int cfs_trace_daemon_command_usrstr(void __user *usr_str, int usr_str_nob) -{ - char *str; - int rc; - - rc = cfs_trace_allocate_string_buffer(&str, usr_str_nob + 1); - if (rc) - return rc; - - rc = cfs_trace_copyin_string(str, usr_str_nob + 1, - usr_str, usr_str_nob); - if (!rc) - rc = cfs_trace_daemon_command(str); - - kfree(str); - return rc; -} - -int cfs_trace_set_debug_mb(int mb) -{ - int i; - int j; - int pages; - int limit = cfs_trace_max_debug_mb(); - struct cfs_trace_cpu_data *tcd; - - if (mb < num_possible_cpus()) { - pr_warn("%d MB is too small for debug buffer size, setting it to %d MB.\n", - mb, num_possible_cpus()); - mb = num_possible_cpus(); - } - - if (mb > limit) { - pr_warn("%d MB is too large for debug buffer size, setting it to %d MB.\n", - mb, limit); - mb = limit; - } - - mb /= num_possible_cpus(); - pages = mb << (20 - PAGE_SHIFT); - - cfs_tracefile_write_lock(); - - cfs_tcd_for_each(tcd, i, j) - tcd->tcd_max_pages = (pages * tcd->tcd_pages_factor) / 100; - - cfs_tracefile_write_unlock(); - - return 0; -} - -int cfs_trace_get_debug_mb(void) -{ - int i; - int j; - struct cfs_trace_cpu_data *tcd; - int total_pages = 0; - - cfs_tracefile_read_lock(); - - cfs_tcd_for_each(tcd, i, j) - total_pages += tcd->tcd_max_pages; - - cfs_tracefile_read_unlock(); - - return (total_pages >> (20 - PAGE_SHIFT)) + 1; -} - -static int tracefiled(void *arg) -{ - struct page_collection pc; - struct tracefiled_ctl *tctl = arg; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - struct file *filp; - char *buf; - int last_loop = 0; - int rc; - - /* we're started late enough that we pick up init's fs context */ - /* this is so broken in uml? what on earth is going on? */ - - complete(&tctl->tctl_start); - - while (1) { - wait_queue_entry_t __wait; - - pc.pc_want_daemon_pages = 0; - collect_pages(&pc); - if (list_empty(&pc.pc_pages)) - goto end_loop; - - filp = NULL; - cfs_tracefile_read_lock(); - if (cfs_tracefile[0]) { - filp = filp_open(cfs_tracefile, - O_CREAT | O_RDWR | O_LARGEFILE, - 0600); - if (IS_ERR(filp)) { - rc = PTR_ERR(filp); - filp = NULL; - pr_warn("couldn't open %s: %d\n", cfs_tracefile, - rc); - } - } - cfs_tracefile_read_unlock(); - if (!filp) { - put_pages_on_daemon_list(&pc); - __LASSERT(list_empty(&pc.pc_pages)); - goto end_loop; - } - - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) { - static loff_t f_pos; - - __LASSERT_TAGE_INVARIANT(tage); - - if (f_pos >= (off_t)cfs_tracefile_size) - f_pos = 0; - else if (f_pos > i_size_read(file_inode(filp))) - f_pos = i_size_read(file_inode(filp)); - - buf = kmap(tage->page); - rc = kernel_write(filp, buf, tage->used, &f_pos); - kunmap(tage->page); - - if (rc != (int)tage->used) { - pr_warn("wanted to write %u but wrote %d\n", - tage->used, rc); - put_pages_back(&pc); - __LASSERT(list_empty(&pc.pc_pages)); - break; - } - } - - filp_close(filp, NULL); - put_pages_on_daemon_list(&pc); - if (!list_empty(&pc.pc_pages)) { - int i; - - pr_alert("trace pages aren't empty\n"); - pr_err("total cpus(%d): ", num_possible_cpus()); - for (i = 0; i < num_possible_cpus(); i++) - if (cpu_online(i)) - pr_cont("%d(on) ", i); - else - pr_cont("%d(off) ", i); - pr_cont("\n"); - - i = 0; - list_for_each_entry_safe(tage, tmp, &pc.pc_pages, - linkage) - pr_err("page %d belongs to cpu %d\n", - ++i, tage->cpu); - pr_err("There are %d pages unwritten\n", i); - } - __LASSERT(list_empty(&pc.pc_pages)); -end_loop: - if (atomic_read(&tctl->tctl_shutdown)) { - if (!last_loop) { - last_loop = 1; - continue; - } else { - break; - } - } - init_waitqueue_entry(&__wait, current); - add_wait_queue(&tctl->tctl_waitq, &__wait); - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(HZ); - remove_wait_queue(&tctl->tctl_waitq, &__wait); - } - complete(&tctl->tctl_stop); - return 0; -} - -int cfs_trace_start_thread(void) -{ - struct tracefiled_ctl *tctl = &trace_tctl; - struct task_struct *task; - int rc = 0; - - mutex_lock(&cfs_trace_thread_mutex); - if (thread_running) - goto out; - - init_completion(&tctl->tctl_start); - init_completion(&tctl->tctl_stop); - init_waitqueue_head(&tctl->tctl_waitq); - atomic_set(&tctl->tctl_shutdown, 0); - - task = kthread_run(tracefiled, tctl, "ktracefiled"); - if (IS_ERR(task)) { - rc = PTR_ERR(task); - goto out; - } - - wait_for_completion(&tctl->tctl_start); - thread_running = 1; -out: - mutex_unlock(&cfs_trace_thread_mutex); - return rc; -} - -void cfs_trace_stop_thread(void) -{ - struct tracefiled_ctl *tctl = &trace_tctl; - - mutex_lock(&cfs_trace_thread_mutex); - if (thread_running) { - pr_info("shutting down debug daemon thread...\n"); - atomic_set(&tctl->tctl_shutdown, 1); - wait_for_completion(&tctl->tctl_stop); - thread_running = 0; - } - mutex_unlock(&cfs_trace_thread_mutex); -} - -int cfs_tracefile_init(int max_pages) -{ - struct cfs_trace_cpu_data *tcd; - int i; - int j; - int rc; - int factor; - - rc = cfs_tracefile_init_arch(); - if (rc) - return rc; - - cfs_tcd_for_each(tcd, i, j) { - /* tcd_pages_factor is initialized int tracefile_init_arch. */ - factor = tcd->tcd_pages_factor; - INIT_LIST_HEAD(&tcd->tcd_pages); - INIT_LIST_HEAD(&tcd->tcd_stock_pages); - INIT_LIST_HEAD(&tcd->tcd_daemon_pages); - tcd->tcd_cur_pages = 0; - tcd->tcd_cur_stock_pages = 0; - tcd->tcd_cur_daemon_pages = 0; - tcd->tcd_max_pages = (max_pages * factor) / 100; - LASSERT(tcd->tcd_max_pages > 0); - tcd->tcd_shutting_down = 0; - } - - return 0; -} - -static void trace_cleanup_on_all_cpus(void) -{ - struct cfs_trace_cpu_data *tcd; - struct cfs_trace_page *tage; - struct cfs_trace_page *tmp; - int i, cpu; - - for_each_possible_cpu(cpu) { - cfs_tcd_for_each_type_lock(tcd, i, cpu) { - tcd->tcd_shutting_down = 1; - - list_for_each_entry_safe(tage, tmp, &tcd->tcd_pages, - linkage) { - __LASSERT_TAGE_INVARIANT(tage); - - list_del(&tage->linkage); - cfs_tage_free(tage); - } - - tcd->tcd_cur_pages = 0; - } - } -} - -static void cfs_trace_cleanup(void) -{ - struct page_collection pc; - - INIT_LIST_HEAD(&pc.pc_pages); - - trace_cleanup_on_all_cpus(); - - cfs_tracefile_fini_arch(); -} - -void cfs_tracefile_exit(void) -{ - cfs_trace_stop_thread(); - cfs_trace_cleanup(); -} |