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 static DECLARE_RWSEM(cfs_tracefile_sem);
53 int cfs_tracefile_init_arch(void)
57 struct cfs_trace_cpu_data *tcd;
59 /* initialize trace_data */
60 memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
61 for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
63 kmalloc_array(num_possible_cpus(),
64 sizeof(union cfs_trace_data_union),
66 if (!cfs_trace_data[i])
70 /* arch related info initialized */
71 cfs_tcd_for_each(tcd, i, j) {
72 spin_lock_init(&tcd->tcd_lock);
73 tcd->tcd_pages_factor = pages_factor[i];
78 for (i = 0; i < num_possible_cpus(); i++)
79 for (j = 0; j < 3; j++) {
80 cfs_trace_console_buffers[i][j] =
81 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
84 if (!cfs_trace_console_buffers[i][j])
91 cfs_tracefile_fini_arch();
92 pr_err("lnet: Not enough memory\n");
96 void cfs_tracefile_fini_arch(void)
101 for (i = 0; i < num_possible_cpus(); i++)
102 for (j = 0; j < 3; j++) {
103 kfree(cfs_trace_console_buffers[i][j]);
104 cfs_trace_console_buffers[i][j] = NULL;
107 for (i = 0; cfs_trace_data[i]; i++) {
108 kfree(cfs_trace_data[i]);
109 cfs_trace_data[i] = NULL;
113 void cfs_tracefile_read_lock(void)
115 down_read(&cfs_tracefile_sem);
118 void cfs_tracefile_read_unlock(void)
120 up_read(&cfs_tracefile_sem);
123 void cfs_tracefile_write_lock(void)
125 down_write(&cfs_tracefile_sem);
128 void cfs_tracefile_write_unlock(void)
130 up_write(&cfs_tracefile_sem);
133 enum cfs_trace_buf_type cfs_trace_buf_idx_get(void)
136 return CFS_TCD_TYPE_IRQ;
138 return CFS_TCD_TYPE_SOFTIRQ;
139 return CFS_TCD_TYPE_PROC;
143 * The walking argument indicates the locking comes from all tcd types
144 * iterator and we must lock it and dissable local irqs to avoid deadlocks
145 * with other interrupt locks that might be happening. See LU-1311
148 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
149 __acquires(&tcd->tcd_lock)
151 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
152 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
153 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
154 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
155 spin_lock_bh(&tcd->tcd_lock);
156 else if (unlikely(walking))
157 spin_lock_irq(&tcd->tcd_lock);
159 spin_lock(&tcd->tcd_lock);
163 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
164 __releases(&tcd->tcd_lock)
166 __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
167 if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
168 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
169 else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
170 spin_unlock_bh(&tcd->tcd_lock);
171 else if (unlikely(walking))
172 spin_unlock_irq(&tcd->tcd_lock);
174 spin_unlock(&tcd->tcd_lock);
177 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
178 struct cfs_trace_page *tage)
181 * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
182 * from here: this will lead to infinite recursion.
184 return tcd->tcd_cpu == tage->cpu;
188 cfs_set_ptldebug_header(struct ptldebug_header *header,
189 struct libcfs_debug_msg_data *msgdata,
192 struct timespec64 ts;
194 ktime_get_real_ts64(&ts);
196 header->ph_subsys = msgdata->msg_subsys;
197 header->ph_mask = msgdata->msg_mask;
198 header->ph_cpu_id = smp_processor_id();
199 header->ph_type = cfs_trace_buf_idx_get();
200 /* y2038 safe since all user space treats this as unsigned, but
201 * will overflow in 2106
203 header->ph_sec = (u32)ts.tv_sec;
204 header->ph_usec = ts.tv_nsec / NSEC_PER_USEC;
205 header->ph_stack = stack;
206 header->ph_pid = current->pid;
207 header->ph_line_num = msgdata->msg_line;
208 header->ph_extern_pid = 0;
212 * tty_write_msg - write a message to a certain tty, not just the console.
213 * @tty: the destination tty_struct
214 * @msg: the message to write
216 * tty_write_message is not exported, so write a same function for it
219 static void tty_write_msg(struct tty_struct *tty, const char *msg)
221 mutex_lock(&tty->atomic_write_lock);
223 if (tty->ops->write && tty->count > 0)
224 tty->ops->write(tty, msg, strlen(msg));
226 mutex_unlock(&tty->atomic_write_lock);
227 wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
230 static void cfs_tty_write_message(const char *prefix, int mask, const char *msg)
232 struct tty_struct *tty;
234 tty = get_current_tty();
238 tty_write_msg(tty, prefix);
239 if ((mask & D_EMERG) || (mask & D_ERROR))
240 tty_write_msg(tty, "Error");
241 tty_write_msg(tty, ": ");
242 tty_write_msg(tty, msg);
246 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
247 const char *buf, int len, const char *file,
250 char *prefix = "Lustre";
252 if (hdr->ph_subsys == S_LND || hdr->ph_subsys == S_LNET)
255 if (mask & D_CONSOLE) {
257 pr_emerg("%sError: %.*s", prefix, len, buf);
258 else if (mask & D_ERROR)
259 pr_err("%sError: %.*s", prefix, len, buf);
260 else if (mask & D_WARNING)
261 pr_warn("%s: %.*s", prefix, len, buf);
262 else if (mask & libcfs_printk)
263 pr_info("%s: %.*s", prefix, len, buf);
266 pr_emerg("%sError: %d:%d:(%s:%d:%s()) %.*s", prefix,
267 hdr->ph_pid, hdr->ph_extern_pid, file,
268 hdr->ph_line_num, fn, len, buf);
269 else if (mask & D_ERROR)
270 pr_err("%sError: %d:%d:(%s:%d:%s()) %.*s", prefix,
271 hdr->ph_pid, hdr->ph_extern_pid, file,
272 hdr->ph_line_num, fn, len, buf);
273 else if (mask & D_WARNING)
274 pr_warn("%s: %d:%d:(%s:%d:%s()) %.*s", prefix,
275 hdr->ph_pid, hdr->ph_extern_pid, file,
276 hdr->ph_line_num, fn, len, buf);
277 else if (mask & (D_CONSOLE | libcfs_printk))
278 pr_info("%s: %.*s", prefix, len, buf);
282 cfs_tty_write_message(prefix, mask, buf);
285 int cfs_trace_max_debug_mb(void)
287 int total_mb = (cfs_totalram_pages() >> (20 - PAGE_SHIFT));
289 return max(512, (total_mb * 80) / 100);