drivers/staging/lustre/lnet/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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LNET
  34 #define LUSTRE_TRACEFILE_PRIVATE
  35
  36 #include <linux/libcfs/libcfs.h>
  37 #include "../tracefile.h"
  38
  39 /* percents to share the total debug memory for each type */
  40 static unsigned int pages_factor[CFS_TCD_TYPE_MAX] = {
  41         80,  /* 80% pages for CFS_TCD_TYPE_PROC */
  42         10,  /* 10% pages for CFS_TCD_TYPE_SOFTIRQ */
  43         10   /* 10% pages for CFS_TCD_TYPE_IRQ */
  44 };
  45
  46 char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX];
  47
  48 static DECLARE_RWSEM(cfs_tracefile_sem);
  49
  50 int cfs_tracefile_init_arch(void)
  51 {
  52         int i;
  53         int j;
  54         struct cfs_trace_cpu_data *tcd;
  55
  56         /* initialize trace_data */
  57         memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
  58         for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
  59                 cfs_trace_data[i] =
  60                         kmalloc_array(num_possible_cpus(),
  61                                       sizeof(union cfs_trace_data_union),
  62                                       GFP_KERNEL);
  63                 if (!cfs_trace_data[i])
  64                         goto out;
  65         }
  66
  67         /* arch related info initialized */
  68         cfs_tcd_for_each(tcd, i, j) {
  69                 spin_lock_init(&tcd->tcd_lock);
  70                 tcd->tcd_pages_factor = pages_factor[i];
  71                 tcd->tcd_type = i;
  72                 tcd->tcd_cpu = j;
  73         }
  74
  75         for (i = 0; i < num_possible_cpus(); i++)
  76                 for (j = 0; j < 3; j++) {
  77                         cfs_trace_console_buffers[i][j] =
  78                                 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
  79                                         GFP_KERNEL);
  80
  81                         if (!cfs_trace_console_buffers[i][j])
  82                                 goto out;
  83                 }
  84
  85         return 0;
  86
  87 out:
  88         cfs_tracefile_fini_arch();
  89         pr_err("lnet: Not enough memory\n");
  90         return -ENOMEM;
  91 }
  92
  93 void cfs_tracefile_fini_arch(void)
  94 {
  95         int i;
  96         int j;
  97
  98         for (i = 0; i < num_possible_cpus(); i++)
  99                 for (j = 0; j < 3; j++) {
 100                         kfree(cfs_trace_console_buffers[i][j]);
 101                         cfs_trace_console_buffers[i][j] = NULL;
 102                 }
 103
 104         for (i = 0; cfs_trace_data[i]; i++) {
 105                 kfree(cfs_trace_data[i]);
 106                 cfs_trace_data[i] = NULL;
 107         }
 108 }
 109
 110 void cfs_tracefile_read_lock(void)
 111 {
 112         down_read(&cfs_tracefile_sem);
 113 }
 114
 115 void cfs_tracefile_read_unlock(void)
 116 {
 117         up_read(&cfs_tracefile_sem);
 118 }
 119
 120 void cfs_tracefile_write_lock(void)
 121 {
 122         down_write(&cfs_tracefile_sem);
 123 }
 124
 125 void cfs_tracefile_write_unlock(void)
 126 {
 127         up_write(&cfs_tracefile_sem);
 128 }
 129
 130 enum cfs_trace_buf_type cfs_trace_buf_idx_get(void)
 131 {
 132         if (in_irq())
 133                 return CFS_TCD_TYPE_IRQ;
 134         if (in_softirq())
 135                 return CFS_TCD_TYPE_SOFTIRQ;
 136         return CFS_TCD_TYPE_PROC;
 137 }
 138
 139 /*
 140  * The walking argument indicates the locking comes from all tcd types
 141  * iterator and we must lock it and dissable local irqs to avoid deadlocks
 142  * with other interrupt locks that might be happening. See LU-1311
 143  * for details.
 144  */
 145 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
 146         __acquires(&tcd->tc_lock)
 147 {
 148         __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
 149         if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
 150                 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
 151         else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
 152                 spin_lock_bh(&tcd->tcd_lock);
 153         else if (unlikely(walking))
 154                 spin_lock_irq(&tcd->tcd_lock);
 155         else
 156                 spin_lock(&tcd->tcd_lock);
 157         return 1;
 158 }
 159
 160 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
 161         __releases(&tcd->tcd_lock)
 162 {
 163         __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
 164         if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
 165                 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
 166         else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
 167                 spin_unlock_bh(&tcd->tcd_lock);
 168         else if (unlikely(walking))
 169                 spin_unlock_irq(&tcd->tcd_lock);
 170         else
 171                 spin_unlock(&tcd->tcd_lock);
 172 }
 173
 174 void
 175 cfs_set_ptldebug_header(struct ptldebug_header *header,
 176                         struct libcfs_debug_msg_data *msgdata,
 177                         unsigned long stack)
 178 {
 179         struct timespec64 ts;
 180
 181         ktime_get_real_ts64(&ts);
 182
 183         header->ph_subsys = msgdata->msg_subsys;
 184         header->ph_mask = msgdata->msg_mask;
 185         header->ph_cpu_id = smp_processor_id();
 186         header->ph_type = cfs_trace_buf_idx_get();
 187         /* y2038 safe since all user space treats this as unsigned, but
 188          * will overflow in 2106
 189          */
 190         header->ph_sec = (u32)ts.tv_sec;
 191         header->ph_usec = ts.tv_nsec / NSEC_PER_USEC;
 192         header->ph_stack = stack;
 193         header->ph_pid = current->pid;
 194         header->ph_line_num = msgdata->msg_line;
 195         header->ph_extern_pid = 0;
 196 }
 197
 198 static char *
 199 dbghdr_to_err_string(struct ptldebug_header *hdr)
 200 {
 201         switch (hdr->ph_subsys) {
 202         case S_LND:
 203         case S_LNET:
 204                 return "LNetError";
 205         default:
 206                 return "LustreError";
 207         }
 208 }
 209
 210 static char *
 211 dbghdr_to_info_string(struct ptldebug_header *hdr)
 212 {
 213         switch (hdr->ph_subsys) {
 214         case S_LND:
 215         case S_LNET:
 216                 return "LNet";
 217         default:
 218                 return "Lustre";
 219         }
 220 }
 221
 222 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
 223                           const char *buf, int len, const char *file,
 224                           const char *fn)
 225 {
 226         char *prefix = "Lustre", *ptype = NULL;
 227
 228         if (mask & D_EMERG) {
 229                 prefix = dbghdr_to_err_string(hdr);
 230                 ptype = KERN_EMERG;
 231         } else if (mask & D_ERROR) {
 232                 prefix = dbghdr_to_err_string(hdr);
 233                 ptype = KERN_ERR;
 234         } else if (mask & D_WARNING) {
 235                 prefix = dbghdr_to_info_string(hdr);
 236                 ptype = KERN_WARNING;
 237         } else if (mask & (D_CONSOLE | libcfs_printk)) {
 238                 prefix = dbghdr_to_info_string(hdr);
 239                 ptype = KERN_INFO;
 240         }
 241
 242         if (mask & D_CONSOLE) {
 243                 pr_info("%s%s: %.*s", ptype, prefix, len, buf);
 244         } else {
 245                 pr_info("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix,
 246                         hdr->ph_pid, hdr->ph_extern_pid, file,
 247                         hdr->ph_line_num, fn, len, buf);
 248         }
 249 }
 250
 251 int cfs_trace_max_debug_mb(void)
 252 {
 253         int  total_mb = (totalram_pages >> (20 - PAGE_SHIFT));
 254
 255         return max(512, (total_mb * 80) / 100);
 256 }