4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_LNET
34 #define LUSTRE_TRACEFILE_PRIVATE
36 #include <linux/slab.h>
37 #include <linux/tty.h>
38 #include <linux/poll.h>
40 #include "tracefile.h"
42 /* percents to share the total debug memory for each type */
43 static unsigned int pages_factor[CFS_TCD_TYPE_MAX] = {
44 80, /* 80% pages for CFS_TCD_TYPE_PROC */
45 10, /* 10% pages for CFS_TCD_TYPE_SOFTIRQ */
46 10 /* 10% pages for CFS_TCD_TYPE_IRQ */
49 char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
51 int cfs_tracefile_init_arch(void)
55 struct cfs_trace_cpu_data *tcd;
57 /* initialize trace_data */
58 memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
59 for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
61 kmalloc_array(num_possible_cpus(),
62 sizeof(union cfs_trace_data_union),
64 if (!cfs_trace_data[i])
68 /* arch related info initialized */
69 cfs_tcd_for_each(tcd, i, j) {
70 spin_lock_init(&tcd->tcd_lock);
71 tcd->tcd_pages_factor = pages_factor[i];
76 for (i = 0; i < num_possible_cpus(); i++)
77 for (j = 0; j < 3; j++) {
78 cfs_trace_console_buffers[i][j] =
79 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
82 if (!cfs_trace_console_buffers[i][j])
89 cfs_tracefile_fini_arch();
90 pr_err("lnet: Not enough memory\n");
94 void cfs_tracefile_fini_arch(void)
99 for (i = 0; i < num_possible_cpus(); i++)
100 for (j = 0; j < 3; j++) {
101 kfree(cfs_trace_console_buffers[i][j]);
102 cfs_trace_console_buffers[i][j] = NULL;
105 for (i = 0; cfs_trace_data[i]; i++) {
106 kfree(cfs_trace_data[i]);
107 cfs_trace_data[i] = NULL;
111 enum cfs_trace_buf_type cfs_trace_buf_idx_get(void)
114 return CFS_TCD_TYPE_IRQ;
116 return CFS_TCD_TYPE_SOFTIRQ;
117 return CFS_TCD_TYPE_PROC;
121 * The walking argument indicates the locking comes from all tcd types
122 * iterator and we must lock it and dissable local irqs to avoid deadlocks
123 * with other interrupt locks that might be happening. See LU-1311
126 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
127 __acquires(&tcd->tcd_lock)
129 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
130 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
131 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
132 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
133 spin_lock_bh(&tcd->tcd_lock);
134 else if (unlikely(walking))
135 spin_lock_irq(&tcd->tcd_lock);
137 spin_lock(&tcd->tcd_lock);
141 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
142 __releases(&tcd->tcd_lock)
144 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
145 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
146 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
147 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
148 spin_unlock_bh(&tcd->tcd_lock);
149 else if (unlikely(walking))
150 spin_unlock_irq(&tcd->tcd_lock);
152 spin_unlock(&tcd->tcd_lock);
155 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
156 struct cfs_trace_page *tage)
159 * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
160 * from here: this will lead to infinite recursion.
162 return tcd->tcd_cpu == tage->cpu;
166 cfs_set_ptldebug_header(struct ptldebug_header *header,
167 struct libcfs_debug_msg_data *msgdata,
170 struct timespec64 ts;
172 ktime_get_real_ts64(&ts);
174 header->ph_subsys = msgdata->msg_subsys;
175 header->ph_mask = msgdata->msg_mask;
176 header->ph_cpu_id = smp_processor_id();
177 header->ph_type = cfs_trace_buf_idx_get();
178 /* y2038 safe since all user space treats this as unsigned, but
179 * will overflow in 2106
181 header->ph_sec = (u32)ts.tv_sec;
182 header->ph_usec = ts.tv_nsec / NSEC_PER_USEC;
183 header->ph_stack = stack;
184 header->ph_pid = current->pid;
185 header->ph_line_num = msgdata->msg_line;
186 header->ph_extern_pid = 0;
190 * tty_write_msg - write a message to a certain tty, not just the console.
191 * @tty: the destination tty_struct
192 * @msg: the message to write
194 * tty_write_message is not exported, so write a same function for it
197 static void tty_write_msg(struct tty_struct *tty, const char *msg)
199 mutex_lock(&tty->atomic_write_lock);
201 if (tty->ops->write && tty->count > 0)
202 tty->ops->write(tty, msg, strlen(msg));
204 mutex_unlock(&tty->atomic_write_lock);
205 wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
208 static void cfs_tty_write_message(const char *prefix, int mask, const char *msg)
210 struct tty_struct *tty;
212 tty = get_current_tty();
216 tty_write_msg(tty, prefix);
217 if ((mask & D_EMERG) || (mask & D_ERROR))
218 tty_write_msg(tty, "Error");
219 tty_write_msg(tty, ": ");
220 tty_write_msg(tty, msg);
224 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
225 const char *buf, int len, const char *file,
228 char *prefix = "Lustre";
230 if (hdr->ph_subsys == S_LND || hdr->ph_subsys == S_LNET)
233 if (mask & D_CONSOLE) {
235 pr_emerg("%sError: %.*s", prefix, len, buf);
236 else if (mask & D_ERROR)
237 pr_err("%sError: %.*s", prefix, len, buf);
238 else if (mask & D_WARNING)
239 pr_warn("%s: %.*s", prefix, len, buf);
240 else if (mask & libcfs_printk)
241 pr_info("%s: %.*s", prefix, len, buf);
244 pr_emerg("%sError: %d:%d:(%s:%d:%s()) %.*s", prefix,
245 hdr->ph_pid, hdr->ph_extern_pid, file,
246 hdr->ph_line_num, fn, len, buf);
247 else if (mask & D_ERROR)
248 pr_err("%sError: %d:%d:(%s:%d:%s()) %.*s", prefix,
249 hdr->ph_pid, hdr->ph_extern_pid, file,
250 hdr->ph_line_num, fn, len, buf);
251 else if (mask & D_WARNING)
252 pr_warn("%s: %d:%d:(%s:%d:%s()) %.*s", prefix,
253 hdr->ph_pid, hdr->ph_extern_pid, file,
254 hdr->ph_line_num, fn, len, buf);
255 else if (mask & (D_CONSOLE | libcfs_printk))
256 pr_info("%s: %.*s", prefix, len, buf);
260 cfs_tty_write_message(prefix, mask, buf);