libcfs/libcfs/linux/linux-tracefile.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   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.
  11  *
  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).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  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
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LNET
  38 #define LUSTRE_TRACEFILE_PRIVATE
  39
  40 #include <libcfs/libcfs.h>
  41 #include "tracefile.h"
  42
  43 /* percents to share the total debug memory for each type */
  44 static unsigned int pages_factor[TCD_TYPE_MAX] = {
  45         80,  /* 80% pages for TCD_TYPE_PROC */
  46         10,  /* 10% pages for TCD_TYPE_SOFTIRQ */
  47         10   /* 10% pages for TCD_TYPE_IRQ */
  48 };
  49
  50 char *trace_console_buffers[NR_CPUS][TCD_TYPE_MAX];
  51
  52 struct rw_semaphore tracefile_sem;
  53
  54 int tracefile_init_arch()
  55 {
  56         int    i;
  57         int    j;
  58         struct trace_cpu_data *tcd;
  59
  60         init_rwsem(&tracefile_sem);
  61
  62         /* initialize trace_data */
  63         memset(trace_data, 0, sizeof(trace_data));
  64         for (i = 0; i < TCD_TYPE_MAX; i++) {
  65                 trace_data[i]=kmalloc(sizeof(union trace_data_union)*NR_CPUS,
  66                                                           GFP_KERNEL);
  67                 if (trace_data[i] == NULL)
  68                         goto out;
  69
  70         }
  71
  72         /* arch related info initialized */
  73         tcd_for_each(tcd, i, j) {
  74                 spin_lock_init(&tcd->tcd_lock);
  75                 tcd->tcd_pages_factor = pages_factor[i];
  76                 tcd->tcd_type = i;
  77                 tcd->tcd_cpu = j;
  78         }
  79
  80         for (i = 0; i < num_possible_cpus(); i++)
  81                 for (j = 0; j < 3; j++) {
  82                         trace_console_buffers[i][j] =
  83                                 kmalloc(TRACE_CONSOLE_BUFFER_SIZE,
  84                                         GFP_KERNEL);
  85
  86                         if (trace_console_buffers[i][j] == NULL)
  87                                 goto out;
  88                 }
  89
  90         return 0;
  91
  92 out:
  93         tracefile_fini_arch();
  94         printk(KERN_ERR "lnet: No enough memory\n");
  95         return -ENOMEM;
  96
  97 }
  98
  99 void tracefile_fini_arch()
 100 {
 101         int    i;
 102         int    j;
 103
 104         for (i = 0; i < num_possible_cpus(); i++)
 105                 for (j = 0; j < 3; j++)
 106                         if (trace_console_buffers[i][j] != NULL) {
 107                                 kfree(trace_console_buffers[i][j]);
 108                                 trace_console_buffers[i][j] = NULL;
 109                         }
 110
 111         for (i = 0; trace_data[i] != NULL; i++) {
 112                 kfree(trace_data[i]);
 113                 trace_data[i] = NULL;
 114         }
 115
 116         fini_rwsem(&tracefile_sem);
 117 }
 118
 119 void tracefile_read_lock()
 120 {
 121         down_read(&tracefile_sem);
 122 }
 123
 124 void tracefile_read_unlock()
 125 {
 126         up_read(&tracefile_sem);
 127 }
 128
 129 void tracefile_write_lock()
 130 {
 131         down_write(&tracefile_sem);
 132 }
 133
 134 void tracefile_write_unlock()
 135 {
 136         up_write(&tracefile_sem);
 137 }
 138
 139 trace_buf_type_t
 140 trace_buf_idx_get()
 141 {
 142         if (in_irq())
 143                 return TCD_TYPE_IRQ;
 144         else if (in_softirq())
 145                 return TCD_TYPE_SOFTIRQ;
 146         else
 147                 return TCD_TYPE_PROC;
 148 }
 149
 150 int trace_lock_tcd(struct trace_cpu_data *tcd)
 151 {
 152         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
 153         if (tcd->tcd_type == TCD_TYPE_IRQ)
 154                 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
 155         else if (tcd->tcd_type == TCD_TYPE_SOFTIRQ)
 156                 spin_lock_bh(&tcd->tcd_lock);
 157         else
 158                 spin_lock(&tcd->tcd_lock);
 159         return 1;
 160 }
 161
 162 void trace_unlock_tcd(struct trace_cpu_data *tcd)
 163 {
 164         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
 165         if (tcd->tcd_type == TCD_TYPE_IRQ)
 166                 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
 167         else if (tcd->tcd_type == TCD_TYPE_SOFTIRQ)
 168                 spin_unlock_bh(&tcd->tcd_lock);
 169         else
 170                 spin_unlock(&tcd->tcd_lock);
 171 }
 172
 173 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage)
 174 {
 175         /*
 176          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
 177          * from here: this will lead to infinite recursion.
 178          */
 179         return tcd->tcd_cpu == tage->cpu;
 180 }
 181
 182 void
 183 set_ptldebug_header(struct ptldebug_header *header, int subsys, int mask,
 184                     const int line, unsigned long stack)
 185 {
 186         struct timeval tv;
 187
 188         do_gettimeofday(&tv);
 189
 190         header->ph_subsys = subsys;
 191         header->ph_mask = mask;
 192         header->ph_cpu_id = smp_processor_id();
 193         header->ph_sec = (__u32)tv.tv_sec;
 194         header->ph_usec = tv.tv_usec;
 195         header->ph_stack = stack;
 196         header->ph_pid = current->pid;
 197         header->ph_line_num = line;
 198 #if defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,20))
 199         header->ph_extern_pid = current->thread.extern_pid;
 200 #elif defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 201         header->ph_extern_pid = current->thread.mode.tt.extern_pid;
 202 #else
 203         header->ph_extern_pid = 0;
 204 #endif
 205         return;
 206 }
 207
 208 void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
 209                              int len, const char *file, const char *fn)
 210 {
 211         char *prefix = "Lustre", *ptype = NULL;
 212
 213         if ((mask & D_EMERG) != 0) {
 214                 prefix = "LustreError";
 215                 ptype = KERN_EMERG;
 216         } else if ((mask & D_ERROR) != 0) {
 217                 prefix = "LustreError";
 218                 ptype = KERN_ERR;
 219         } else if ((mask & D_WARNING) != 0) {
 220                 prefix = "Lustre";
 221                 ptype = KERN_WARNING;
 222         } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
 223                 prefix = "Lustre";
 224                 ptype = KERN_INFO;
 225         }
 226
 227         if ((mask & D_CONSOLE) != 0) {
 228                 printk("%s%s: %.*s", ptype, prefix, len, buf);
 229         } else {
 230                 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, hdr->ph_pid,
 231                        hdr->ph_extern_pid, file, hdr->ph_line_num, fn, len, buf);
 232         }
 233         return;
 234 }
 235
 236 int trace_max_debug_mb(void)
 237 {
 238         int  total_mb = (num_physpages >> (20 - CFS_PAGE_SHIFT));
 239
 240         return MAX(512, (total_mb * 80)/100);
 241 }