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 #ifndef get_cpu
  44 #define get_cpu() smp_processor_id()
  45 #define put_cpu() do { } while (0)
  46 #endif
  47
  48 /* three types of trace_data in linux */
  49 enum {
  50         TCD_TYPE_PROC = 0,
  51         TCD_TYPE_SOFTIRQ,
  52         TCD_TYPE_IRQ,
  53         TCD_TYPE_MAX
  54 };
  55
  56 /* percents to share the total debug memory for each type */
  57 static unsigned int pages_factor[TCD_TYPE_MAX] = {
  58         80,  /* 80% pages for TCD_TYPE_PROC */
  59         10,  /* 10% pages for TCD_TYPE_SOFTIRQ */
  60         10   /* 10% pages for TCD_TYPE_IRQ */
  61 };
  62
  63 char *trace_console_buffers[NR_CPUS][3];
  64
  65 struct rw_semaphore tracefile_sem;
  66
  67 int tracefile_init_arch()
  68 {
  69         int    i;
  70         int    j;
  71         struct trace_cpu_data *tcd;
  72
  73         init_rwsem(&tracefile_sem);
  74
  75         /* initialize trace_data */
  76         memset(trace_data, 0, sizeof(trace_data));
  77         for (i = 0; i < TCD_TYPE_MAX; i++) {
  78                 trace_data[i]=kmalloc(sizeof(union trace_data_union)*NR_CPUS,
  79                                                           GFP_KERNEL);
  80                 if (trace_data[i] == NULL)
  81                         goto out;
  82
  83         }
  84
  85         /* arch related info initialized */
  86         tcd_for_each(tcd, i, j) {
  87                 spin_lock_init(&tcd->tcd_lock);
  88                 tcd->tcd_pages_factor = pages_factor[i];
  89                 tcd->tcd_type = i;
  90                 tcd->tcd_cpu = j;
  91         }
  92
  93         for (i = 0; i < num_possible_cpus(); i++)
  94                 for (j = 0; j < 3; j++) {
  95                         trace_console_buffers[i][j] =
  96                                 kmalloc(TRACE_CONSOLE_BUFFER_SIZE,
  97                                         GFP_KERNEL);
  98
  99                         if (trace_console_buffers[i][j] == NULL)
 100                                 goto out;
 101                 }
 102
 103         return 0;
 104
 105 out:
 106         tracefile_fini_arch();
 107         printk(KERN_ERR "lnet: No enough memory\n");
 108         return -ENOMEM;
 109
 110 }
 111
 112 void tracefile_fini_arch()
 113 {
 114         int    i;
 115         int    j;
 116
 117         for (i = 0; i < num_possible_cpus(); i++)
 118                 for (j = 0; j < 3; j++)
 119                         if (trace_console_buffers[i][j] != NULL) {
 120                                 kfree(trace_console_buffers[i][j]);
 121                                 trace_console_buffers[i][j] = NULL;
 122                         }
 123
 124         for (i = 0; trace_data[i] != NULL; i++) {
 125                 kfree(trace_data[i]);
 126                 trace_data[i] = NULL;
 127         }
 128
 129         fini_rwsem(&tracefile_sem);
 130 }
 131
 132 void tracefile_read_lock()
 133 {
 134         down_read(&tracefile_sem);
 135 }
 136
 137 void tracefile_read_unlock()
 138 {
 139         up_read(&tracefile_sem);
 140 }
 141
 142 void tracefile_write_lock()
 143 {
 144         down_write(&tracefile_sem);
 145 }
 146
 147 void tracefile_write_unlock()
 148 {
 149         up_write(&tracefile_sem);
 150 }
 151
 152 char *
 153 trace_get_console_buffer(void)
 154 {
 155         int  cpu = get_cpu();
 156         int  idx;
 157
 158         if (in_irq()) {
 159                 idx = 0;
 160         } else if (in_softirq()) {
 161                 idx = 1;
 162         } else {
 163                 idx = 2;
 164         }
 165
 166         return trace_console_buffers[cpu][idx];
 167 }
 168
 169 void
 170 trace_put_console_buffer(char *buffer)
 171 {
 172         put_cpu();
 173 }
 174
 175 struct trace_cpu_data *
 176 trace_get_tcd(void)
 177 {
 178         struct trace_cpu_data *tcd;
 179         int cpu;
 180
 181         cpu = get_cpu();
 182         if (in_irq())
 183                 tcd = &(*trace_data[TCD_TYPE_IRQ])[cpu].tcd;
 184         else if (in_softirq())
 185                 tcd = &(*trace_data[TCD_TYPE_SOFTIRQ])[cpu].tcd;
 186         else
 187                 tcd = &(*trace_data[TCD_TYPE_PROC])[cpu].tcd;
 188
 189         trace_lock_tcd(tcd);
 190
 191         return tcd;
 192 }
 193
 194 void
 195 trace_put_tcd (struct trace_cpu_data *tcd)
 196 {
 197         trace_unlock_tcd(tcd);
 198
 199         put_cpu();
 200 }
 201
 202 int trace_lock_tcd(struct trace_cpu_data *tcd)
 203 {
 204         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
 205
 206         spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
 207
 208         return 1;
 209 }
 210
 211 void trace_unlock_tcd(struct trace_cpu_data *tcd)
 212 {
 213         __LASSERT(tcd->tcd_type < TCD_TYPE_MAX);
 214
 215         spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
 216 }
 217
 218 int tcd_owns_tage(struct trace_cpu_data *tcd, struct trace_page *tage)
 219 {
 220         /*
 221          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
 222          * from here: this will lead to infinite recursion.
 223          */
 224         return tcd->tcd_cpu == tage->cpu;
 225 }
 226
 227 void
 228 set_ptldebug_header(struct ptldebug_header *header, int subsys, int mask,
 229                     const int line, unsigned long stack)
 230 {
 231         struct timeval tv;
 232
 233         do_gettimeofday(&tv);
 234
 235         header->ph_subsys = subsys;
 236         header->ph_mask = mask;
 237         header->ph_cpu_id = smp_processor_id();
 238         header->ph_sec = (__u32)tv.tv_sec;
 239         header->ph_usec = tv.tv_usec;
 240         header->ph_stack = stack;
 241         header->ph_pid = current->pid;
 242         header->ph_line_num = line;
 243 #if defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,20))
 244         header->ph_extern_pid = current->thread.extern_pid;
 245 #elif defined(__arch_um__) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 246         header->ph_extern_pid = current->thread.mode.tt.extern_pid;
 247 #else
 248         header->ph_extern_pid = 0;
 249 #endif
 250         return;
 251 }
 252
 253 void print_to_console(struct ptldebug_header *hdr, int mask, const char *buf,
 254                              int len, const char *file, const char *fn)
 255 {
 256         char *prefix = "Lustre", *ptype = NULL;
 257
 258         if ((mask & D_EMERG) != 0) {
 259                 prefix = "LustreError";
 260                 ptype = KERN_EMERG;
 261         } else if ((mask & D_ERROR) != 0) {
 262                 prefix = "LustreError";
 263                 ptype = KERN_ERR;
 264         } else if ((mask & D_WARNING) != 0) {
 265                 prefix = "Lustre";
 266                 ptype = KERN_WARNING;
 267         } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
 268                 prefix = "Lustre";
 269                 ptype = KERN_INFO;
 270         }
 271
 272         if ((mask & D_CONSOLE) != 0) {
 273                 printk("%s%s: %.*s", ptype, prefix, len, buf);
 274         } else {
 275                 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, hdr->ph_pid,
 276                        hdr->ph_extern_pid, file, hdr->ph_line_num, fn, len, buf);
 277         }
 278         return;
 279 }
 280
 281 int trace_max_debug_mb(void)
 282 {
 283         int  total_mb = (num_physpages >> (20 - CFS_PAGE_SHIFT));
 284
 285         return MAX(512, (total_mb * 80)/100);
 286 }