libcfs/libcfs/linux/linux-tracefile.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   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.
   9  *
  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).
  15  *
  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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  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[CFS_TCD_TYPE_MAX] = {
  45         80,  /* 80% pages for CFS_TCD_TYPE_PROC */
  46         10,  /* 10% pages for CFS_TCD_TYPE_SOFTIRQ */
  47         10   /* 10% pages for CFS_TCD_TYPE_IRQ */
  48 };
  49
  50 char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
  51
  52 struct rw_semaphore cfs_tracefile_sem;
  53
  54 int cfs_tracefile_init_arch()
  55 {
  56         int    i;
  57         int    j;
  58         struct cfs_trace_cpu_data *tcd;
  59
  60         init_rwsem(&cfs_tracefile_sem);
  61
  62         /* initialize trace_data */
  63         memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
  64         for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
  65                 cfs_trace_data[i] =
  66                         kmalloc(sizeof(union cfs_trace_data_union) *
  67                                 num_possible_cpus(), GFP_KERNEL);
  68                 if (cfs_trace_data[i] == NULL)
  69                         goto out;
  70
  71         }
  72
  73         /* arch related info initialized */
  74         cfs_tcd_for_each(tcd, i, j) {
  75                 spin_lock_init(&tcd->tcd_lock);
  76                 tcd->tcd_pages_factor = pages_factor[i];
  77                 tcd->tcd_type = i;
  78                 tcd->tcd_cpu = j;
  79         }
  80
  81         for (i = 0; i < num_possible_cpus(); i++)
  82                 for (j = 0; j < 3; j++) {
  83                         cfs_trace_console_buffers[i][j] =
  84                                 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
  85                                         GFP_KERNEL);
  86
  87                         if (cfs_trace_console_buffers[i][j] == NULL)
  88                                 goto out;
  89                 }
  90
  91         return 0;
  92
  93 out:
  94         cfs_tracefile_fini_arch();
  95         printk(KERN_ERR "lnet: Not enough memory\n");
  96         return -ENOMEM;
  97 }
  98
  99 void cfs_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 (cfs_trace_console_buffers[i][j] != NULL) {
 107                                 kfree(cfs_trace_console_buffers[i][j]);
 108                                 cfs_trace_console_buffers[i][j] = NULL;
 109                         }
 110
 111         for (i = 0; cfs_trace_data[i] != NULL; i++) {
 112                 kfree(cfs_trace_data[i]);
 113                 cfs_trace_data[i] = NULL;
 114         }
 115
 116         fini_rwsem(&cfs_tracefile_sem);
 117 }
 118
 119 void cfs_tracefile_read_lock()
 120 {
 121         down_read(&cfs_tracefile_sem);
 122 }
 123
 124 void cfs_tracefile_read_unlock()
 125 {
 126         up_read(&cfs_tracefile_sem);
 127 }
 128
 129 void cfs_tracefile_write_lock()
 130 {
 131         down_write(&cfs_tracefile_sem);
 132 }
 133
 134 void cfs_tracefile_write_unlock()
 135 {
 136         up_write(&cfs_tracefile_sem);
 137 }
 138
 139 cfs_trace_buf_type_t cfs_trace_buf_idx_get()
 140 {
 141         if (in_irq())
 142                 return CFS_TCD_TYPE_IRQ;
 143         else if (in_softirq())
 144                 return CFS_TCD_TYPE_SOFTIRQ;
 145         else
 146                 return CFS_TCD_TYPE_PROC;
 147 }
 148
 149 /*
 150  * The walking argument indicates the locking comes from all tcd types
 151  * iterator and we must lock it and dissable local irqs to avoid deadlocks
 152  * with other interrupt locks that might be happening. See LU-1311
 153  * for details.
 154  */
 155 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
 156 __acquires(&tcd->tcd_lock)
 157 {
 158         __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
 159         if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
 160                 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
 161         else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
 162                 spin_lock_bh(&tcd->tcd_lock);
 163         else if (unlikely(walking))
 164                 spin_lock_irq(&tcd->tcd_lock);
 165         else
 166                 spin_lock(&tcd->tcd_lock);
 167         return 1;
 168 }
 169
 170 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
 171 __releases(&tcd->tcd_lock)
 172 {
 173         __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
 174         if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
 175                 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
 176         else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
 177                 spin_unlock_bh(&tcd->tcd_lock);
 178         else if (unlikely(walking))
 179                 spin_unlock_irq(&tcd->tcd_lock);
 180         else
 181                 spin_unlock(&tcd->tcd_lock);
 182 }
 183
 184 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
 185                       struct cfs_trace_page *tage)
 186 {
 187         /*
 188          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
 189          * from here: this will lead to infinite recursion.
 190          */
 191         return tcd->tcd_cpu == tage->cpu;
 192 }
 193
 194 void
 195 cfs_set_ptldebug_header(struct ptldebug_header *header,
 196                         struct libcfs_debug_msg_data *msgdata,
 197                         unsigned long stack)
 198 {
 199         struct timeval tv;
 200
 201         do_gettimeofday(&tv);
 202
 203         header->ph_subsys = msgdata->msg_subsys;
 204         header->ph_mask = msgdata->msg_mask;
 205         header->ph_cpu_id = smp_processor_id();
 206         header->ph_type = cfs_trace_buf_idx_get();
 207         header->ph_sec = (__u32)tv.tv_sec;
 208         header->ph_usec = tv.tv_usec;
 209         header->ph_stack = stack;
 210         header->ph_pid = current->pid;
 211         header->ph_line_num = msgdata->msg_line;
 212         header->ph_extern_pid = 0;
 213         return;
 214 }
 215
 216 static char *
 217 dbghdr_to_err_string(struct ptldebug_header *hdr)
 218 {
 219         switch (hdr->ph_subsys) {
 220
 221                 case S_LND:
 222                 case S_LNET:
 223                         return "LNetError";
 224                 default:
 225                         return "LustreError";
 226         }
 227 }
 228
 229 static char *
 230 dbghdr_to_info_string(struct ptldebug_header *hdr)
 231 {
 232         switch (hdr->ph_subsys) {
 233
 234                 case S_LND:
 235                 case S_LNET:
 236                         return "LNet";
 237                 default:
 238                         return "Lustre";
 239         }
 240 }
 241
 242 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
 243                           const char *buf, int len, const char *file,
 244                           const char *fn)
 245 {
 246         char *prefix = "Lustre", *ptype = NULL;
 247
 248         if ((mask & D_EMERG) != 0) {
 249                 prefix = dbghdr_to_err_string(hdr);
 250                 ptype = KERN_EMERG;
 251         } else if ((mask & D_ERROR) != 0) {
 252                 prefix = dbghdr_to_err_string(hdr);
 253                 ptype = KERN_ERR;
 254         } else if ((mask & D_WARNING) != 0) {
 255                 prefix = dbghdr_to_info_string(hdr);
 256                 ptype = KERN_WARNING;
 257         } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
 258                 prefix = dbghdr_to_info_string(hdr);
 259                 ptype = KERN_INFO;
 260         }
 261
 262         if ((mask & D_CONSOLE) != 0) {
 263                 printk("%s%s: %.*s", ptype, prefix, len, buf);
 264         } else {
 265                 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix,
 266                        hdr->ph_pid, hdr->ph_extern_pid, file, hdr->ph_line_num,
 267                        fn, len, buf);
 268         }
 269         return;
 270 }
 271
 272 int cfs_trace_max_debug_mb(void)
 273 {
 274         int  total_mb = (totalram_pages >> (20 - PAGE_SHIFT));
 275
 276         return MAX(512, (total_mb * 80)/100);
 277 }