1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see [sun.com URL with a
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_LNET
38 #define LUSTRE_TRACEFILE_PRIVATE
39 #include <libcfs/libcfs.h>
40 #include "tracefile.h"
43 * We can't support smp tracefile currently.
44 * Everything is put on one cpu.
47 #define M_TCD_MAX_PAGES (128 * 1280)
49 static long max_permit_mb = (64 * 1024);
51 spinlock_t trace_cpu_serializer;
54 * thread currently executing tracefile code or NULL if none does. Used to
55 * detect recursive calls to libcfs_debug_msg().
57 static thread_t trace_owner = NULL;
59 extern int get_preemption_level(void);
60 extern atomic_t tage_allocated;
62 struct rw_semaphore tracefile_sem;
64 int tracefile_init_arch() {
65 init_rwsem(&tracefile_sem);
66 #error "Todo: initialise per-cpu console buffers"
70 void tracefile_fini_arch() {
73 void tracefile_read_lock() {
74 down_read(&tracefile_sem);
77 void tracefile_read_unlock() {
78 up_read(&tracefile_sem);
81 void tracefile_write_lock() {
82 down_write(&tracefile_sem);
85 void tracefile_write_unlock() {
86 up_write(&tracefile_sem);
89 char *trace_get_console_buffer(void)
91 #error "todo: return a per-cpu/interrupt console buffer and disable pre-emption"
94 void trace_put_console_buffer(char *buffer)
96 #error "todo: re-enable pre-emption"
99 struct trace_cpu_data *trace_get_tcd(void)
101 struct trace_cpu_data *tcd;
103 struct list_head pages;
106 * XXX nikita: do NOT call libcfs_debug_msg() (CDEBUG/ENTRY/EXIT)
107 * from here: this will lead to infinite recursion.
111 * debugging check for recursive call to libcfs_debug_msg()
113 if (trace_owner == current_thread()) {
115 * Cannot assert here.
117 printk(KERN_EMERG "recursive call to %s", __FUNCTION__);
119 * "The death of God left the angels in a strange position."
121 cfs_enter_debugger();
123 tcd = &trace_data[0].tcd;
124 CFS_INIT_LIST_HEAD(&pages);
125 if (get_preemption_level() == 0)
126 nr_pages = trace_refill_stock(tcd, CFS_ALLOC_STD, &pages);
129 spin_lock(&trace_cpu_serializer);
130 trace_owner = current_thread();
131 tcd->tcd_cur_stock_pages += nr_pages;
132 list_splice(&pages, &tcd->tcd_stock_pages);
136 extern void raw_page_death_row_clean(void);
138 void __trace_put_tcd(struct trace_cpu_data *tcd)
141 * XXX nikita: do NOT call libcfs_debug_msg() (CDEBUG/ENTRY/EXIT)
142 * from here: this will lead to infinite recursion.
144 LASSERT(trace_owner == current_thread());
146 spin_unlock(&trace_cpu_serializer);
147 if (get_preemption_level() == 0)
148 /* purge all pending pages */
149 raw_page_death_row_clean();
152 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage)
155 * XXX nikita: do NOT call libcfs_debug_msg() (CDEBUG/ENTRY/EXIT)
156 * from here: this will lead to infinite recursion.
158 /* XNU has global tcd, and all pages are owned by it */
163 set_ptldebug_header(struct ptldebug_header *header, int subsys, int mask,
164 const int line, unsigned long stack)
169 * XXX nikita: do NOT call libcfs_debug_msg() (CDEBUG/ENTRY/EXIT)
170 * from here: this will lead to infinite recursion.
172 do_gettimeofday(&tv);
173 header->ph_subsys = subsys;
174 header->ph_mask = mask;
175 header->ph_cpu_id = smp_processor_id();
176 header->ph_sec = (__u32)tv.tv_sec;
177 header->ph_usec = tv.tv_usec;
178 header->ph_stack = stack;
179 header->ph_pid = cfs_curproc_pid();
180 header->ph_line_num = line;
181 header->ph_extern_pid = (__u32)current_thread();
184 void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
185 int len, const char *file, const char *fn)
187 char *prefix = "Lustre", *ptype = KERN_INFO;
190 * XXX nikita: do NOT call libcfs_debug_msg() (CDEBUG/ENTRY/EXIT)
191 * from here: this will lead to infinite recursion.
193 if ((mask & D_EMERG) != 0) {
194 prefix = "LustreError";
196 } else if ((mask & D_ERROR) != 0) {
197 prefix = "LustreError";
199 } else if ((mask & D_WARNING) != 0) {
201 ptype = KERN_WARNING;
202 } else if ((mask & libcfs_printk) != 0 || (mask & D_CONSOLE)) {
207 if ((mask & D_CONSOLE) != 0) {
208 printk("%s%s: %.*s", ptype, prefix, len, buf);
210 printk("%s%s: %d:%d:(%s:%d:%s()) %*s",
211 ptype, prefix, hdr->ph_pid, hdr->ph_extern_pid,
212 file, hdr->ph_line_num, fn, len, buf);
216 int trace_max_debug_mb(void)
218 return max_permit_mb;
222 trace_call_on_all_cpus(void (*fn)(void *arg), void *arg)