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Linux/tools/lib/api/fs/tracing_path.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #ifndef _GNU_SOURCE
  3 # define _GNU_SOURCE
  4 #endif
  5 
  6 #include <stdio.h>
  7 #include <stdlib.h>
  8 #include <string.h>
  9 #include <linux/string.h>
 10 #include <errno.h>
 11 #include <unistd.h>
 12 #include "fs.h"
 13 
 14 #include "tracing_path.h"
 15 
 16 static char tracing_mnt[PATH_MAX]  = "/sys/kernel/debug";
 17 static char tracing_path[PATH_MAX]        = "/sys/kernel/debug/tracing";
 18 static char tracing_events_path[PATH_MAX] = "/sys/kernel/debug/tracing/events";
 19 
 20 static void __tracing_path_set(const char *tracing, const char *mountpoint)
 21 {
 22         snprintf(tracing_mnt, sizeof(tracing_mnt), "%s", mountpoint);
 23         snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
 24                  mountpoint, tracing);
 25         snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
 26                  mountpoint, tracing, "events");
 27 }
 28 
 29 static const char *tracing_path_tracefs_mount(void)
 30 {
 31         const char *mnt;
 32 
 33         mnt = tracefs__mount();
 34         if (!mnt)
 35                 return NULL;
 36 
 37         __tracing_path_set("", mnt);
 38 
 39         return tracing_path;
 40 }
 41 
 42 static const char *tracing_path_debugfs_mount(void)
 43 {
 44         const char *mnt;
 45 
 46         mnt = debugfs__mount();
 47         if (!mnt)
 48                 return NULL;
 49 
 50         __tracing_path_set("tracing/", mnt);
 51 
 52         return tracing_path;
 53 }
 54 
 55 const char *tracing_path_mount(void)
 56 {
 57         const char *mnt;
 58 
 59         mnt = tracing_path_tracefs_mount();
 60         if (mnt)
 61                 return mnt;
 62 
 63         mnt = tracing_path_debugfs_mount();
 64 
 65         return mnt;
 66 }
 67 
 68 void tracing_path_set(const char *mntpt)
 69 {
 70         __tracing_path_set("tracing/", mntpt);
 71 }
 72 
 73 char *get_tracing_file(const char *name)
 74 {
 75         char *file;
 76 
 77         if (asprintf(&file, "%s/%s", tracing_path_mount(), name) < 0)
 78                 return NULL;
 79 
 80         return file;
 81 }
 82 
 83 void put_tracing_file(char *file)
 84 {
 85         free(file);
 86 }
 87 
 88 char *get_events_file(const char *name)
 89 {
 90         char *file;
 91 
 92         if (asprintf(&file, "%s/events/%s", tracing_path_mount(), name) < 0)
 93                 return NULL;
 94 
 95         return file;
 96 }
 97 
 98 void put_events_file(char *file)
 99 {
100         free(file);
101 }
102 
103 DIR *tracing_events__opendir(void)
104 {
105         DIR *dir = NULL;
106         char *path = get_tracing_file("events");
107 
108         if (path) {
109                 dir = opendir(path);
110                 put_events_file(path);
111         }
112 
113         return dir;
114 }
115 
116 int tracing_path__strerror_open_tp(int err, char *buf, size_t size,
117                                    const char *sys, const char *name)
118 {
119         char sbuf[128];
120         char filename[PATH_MAX];
121 
122         snprintf(filename, PATH_MAX, "%s/%s", sys, name ?: "*");
123 
124         switch (err) {
125         case ENOENT:
126                 /*
127                  * We will get here if we can't find the tracepoint, but one of
128                  * debugfs or tracefs is configured, which means you probably
129                  * want some tracepoint which wasn't compiled in your kernel.
130                  * - jirka
131                  */
132                 if (debugfs__configured() || tracefs__configured()) {
133                         /* sdt markers */
134                         if (!strncmp(filename, "sdt_", 4)) {
135                                 snprintf(buf, size,
136                                         "Error:\tFile %s/%s not found.\n"
137                                         "Hint:\tSDT event cannot be directly recorded on.\n"
138                                         "\tPlease first use 'perf probe %s:%s' before recording it.\n",
139                                         tracing_events_path, filename, sys, name);
140                         } else {
141                                 snprintf(buf, size,
142                                          "Error:\tFile %s/%s not found.\n"
143                                          "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
144                                          tracing_events_path, filename);
145                         }
146                         break;
147                 }
148                 snprintf(buf, size, "%s",
149                          "Error:\tUnable to find debugfs/tracefs\n"
150                          "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n"
151                          "Hint:\tIs the debugfs/tracefs filesystem mounted?\n"
152                          "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
153                 break;
154         case EACCES: {
155                 snprintf(buf, size,
156                          "Error:\tNo permissions to read %s/%s\n"
157                          "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
158                          tracing_events_path, filename, tracing_path_mount());
159         }
160                 break;
161         default:
162                 snprintf(buf, size, "%s", str_error_r(err, sbuf, sizeof(sbuf)));
163                 break;
164         }
165 
166         return 0;
167 }
168 

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