kernel/drivers/staging/lustre/lustre/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 "../../../include/linux/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 static DECLARE_RWSEM(cfs_tracefile_sem);
  53
  54 int cfs_tracefile_init_arch(void)
  55 {
  56         int    i;
  57         int    j;
  58         struct cfs_trace_cpu_data *tcd;
  59
  60         /* initialize trace_data */
  61         memset(cfs_trace_data, 0, sizeof(cfs_trace_data));
  62         for (i = 0; i < CFS_TCD_TYPE_MAX; i++) {
  63                 cfs_trace_data[i] =
  64                         kmalloc(sizeof(union cfs_trace_data_union) *
  65                                 num_possible_cpus(), GFP_KERNEL);
  66                 if (cfs_trace_data[i] == NULL)
  67                         goto out;
  68
  69         }
  70
  71         /* arch related info initialized */
  72         cfs_tcd_for_each(tcd, i, j) {
  73                 spin_lock_init(&tcd->tcd_lock);
  74                 tcd->tcd_pages_factor = pages_factor[i];
  75                 tcd->tcd_type = i;
  76                 tcd->tcd_cpu = j;
  77         }
  78
  79         for (i = 0; i < num_possible_cpus(); i++)
  80                 for (j = 0; j < 3; j++) {
  81                         cfs_trace_console_buffers[i][j] =
  82                                 kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE,
  83                                         GFP_KERNEL);
  84
  85                         if (cfs_trace_console_buffers[i][j] == NULL)
  86                                 goto out;
  87                 }
  88
  89         return 0;
  90
  91 out:
  92         cfs_tracefile_fini_arch();
  93         printk(KERN_ERR "lnet: Not enough memory\n");
  94         return -ENOMEM;
  95 }
  96
  97 void cfs_tracefile_fini_arch(void)
  98 {
  99         int    i;
 100         int    j;
 101
 102         for (i = 0; i < num_possible_cpus(); i++)
 103                 for (j = 0; j < 3; j++) {
 104                         kfree(cfs_trace_console_buffers[i][j]);
 105                         cfs_trace_console_buffers[i][j] = NULL;
 106                 }
 107
 108         for (i = 0; cfs_trace_data[i] != NULL; i++) {
 109                 kfree(cfs_trace_data[i]);
 110                 cfs_trace_data[i] = NULL;
 111         }
 112 }
 113
 114 void cfs_tracefile_read_lock(void)
 115 {
 116         down_read(&cfs_tracefile_sem);
 117 }
 118
 119 void cfs_tracefile_read_unlock(void)
 120 {
 121         up_read(&cfs_tracefile_sem);
 122 }
 123
 124 void cfs_tracefile_write_lock(void)
 125 {
 126         down_write(&cfs_tracefile_sem);
 127 }
 128
 129 void cfs_tracefile_write_unlock(void)
 130 {
 131         up_write(&cfs_tracefile_sem);
 132 }
 133
 134 cfs_trace_buf_type_t cfs_trace_buf_idx_get(void)
 135 {
 136         if (in_irq())
 137                 return CFS_TCD_TYPE_IRQ;
 138         else if (in_softirq())
 139                 return CFS_TCD_TYPE_SOFTIRQ;
 140         else
 141                 return CFS_TCD_TYPE_PROC;
 142 }
 143
 144 /*
 145  * The walking argument indicates the locking comes from all tcd types
 146  * iterator and we must lock it and dissable local irqs to avoid deadlocks
 147  * with other interrupt locks that might be happening. See LU-1311
 148  * for details.
 149  */
 150 int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
 151         __acquires(&tcd->tc_lock)
 152 {
 153         __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
 154         if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
 155                 spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags);
 156         else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
 157                 spin_lock_bh(&tcd->tcd_lock);
 158         else if (unlikely(walking))
 159                 spin_lock_irq(&tcd->tcd_lock);
 160         else
 161                 spin_lock(&tcd->tcd_lock);
 162         return 1;
 163 }
 164
 165 void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking)
 166         __releases(&tcd->tcd_lock)
 167 {
 168         __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX);
 169         if (tcd->tcd_type == CFS_TCD_TYPE_IRQ)
 170                 spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags);
 171         else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ)
 172                 spin_unlock_bh(&tcd->tcd_lock);
 173         else if (unlikely(walking))
 174                 spin_unlock_irq(&tcd->tcd_lock);
 175         else
 176                 spin_unlock(&tcd->tcd_lock);
 177 }
 178
 179 int cfs_tcd_owns_tage(struct cfs_trace_cpu_data *tcd,
 180                       struct cfs_trace_page *tage)
 181 {
 182         /*
 183          * XXX nikita: do NOT call portals_debug_msg() (CDEBUG/ENTRY/EXIT)
 184          * from here: this will lead to infinite recursion.
 185          */
 186         return tcd->tcd_cpu == tage->cpu;
 187 }
 188
 189 void
 190 cfs_set_ptldebug_header(struct ptldebug_header *header,
 191                         struct libcfs_debug_msg_data *msgdata,
 192                         unsigned long stack)
 193 {
 194         struct timespec64 ts;
 195
 196         ktime_get_real_ts64(&ts);
 197
 198         header->ph_subsys = msgdata->msg_subsys;
 199         header->ph_mask = msgdata->msg_mask;
 200         header->ph_cpu_id = smp_processor_id();
 201         header->ph_type = cfs_trace_buf_idx_get();
 202         /* y2038 safe since all user space treats this as unsigned, but
 203          * will overflow in 2106 */
 204         header->ph_sec = (u32)ts.tv_sec;
 205         header->ph_usec = ts.tv_nsec / NSEC_PER_USEC;
 206         header->ph_stack = stack;
 207         header->ph_pid = current->pid;
 208         header->ph_line_num = msgdata->msg_line;
 209         header->ph_extern_pid = 0;
 210         return;
 211 }
 212
 213 static char *
 214 dbghdr_to_err_string(struct ptldebug_header *hdr)
 215 {
 216         switch (hdr->ph_subsys) {
 217         case S_LND:
 218         case S_LNET:
 219                 return "LNetError";
 220         default:
 221                 return "LustreError";
 222         }
 223 }
 224
 225 static char *
 226 dbghdr_to_info_string(struct ptldebug_header *hdr)
 227 {
 228         switch (hdr->ph_subsys) {
 229         case S_LND:
 230         case S_LNET:
 231                 return "LNet";
 232         default:
 233                 return "Lustre";
 234         }
 235 }
 236
 237 void cfs_print_to_console(struct ptldebug_header *hdr, int mask,
 238                           const char *buf, int len, const char *file,
 239                           const char *fn)
 240 {
 241         char *prefix = "Lustre", *ptype = NULL;
 242
 243         if ((mask & D_EMERG) != 0) {
 244                 prefix = dbghdr_to_err_string(hdr);
 245                 ptype = KERN_EMERG;
 246         } else if ((mask & D_ERROR) != 0) {
 247                 prefix = dbghdr_to_err_string(hdr);
 248                 ptype = KERN_ERR;
 249         } else if ((mask & D_WARNING) != 0) {
 250                 prefix = dbghdr_to_info_string(hdr);
 251                 ptype = KERN_WARNING;
 252         } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) {
 253                 prefix = dbghdr_to_info_string(hdr);
 254                 ptype = KERN_INFO;
 255         }
 256
 257         if ((mask & D_CONSOLE) != 0) {
 258                 printk("%s%s: %.*s", ptype, prefix, len, buf);
 259         } else {
 260                 printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix,
 261                        hdr->ph_pid, hdr->ph_extern_pid, file, hdr->ph_line_num,
 262                        fn, len, buf);
 263         }
 264         return;
 265 }
 266
 267 int cfs_trace_max_debug_mb(void)
 268 {
 269         int  total_mb = (totalram_pages >> (20 - PAGE_SHIFT));
 270
 271         return max(512, (total_mb * 80)/100);
 272 }