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167 lines
3.6 KiB
167 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#ifndef _GNU_SOURCE |
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# define _GNU_SOURCE |
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#endif |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <linux/string.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include "fs.h" |
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#include "tracing_path.h" |
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static char tracing_mnt[PATH_MAX] = "/sys/kernel/debug"; |
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static char tracing_path[PATH_MAX] = "/sys/kernel/debug/tracing"; |
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static char tracing_events_path[PATH_MAX] = "/sys/kernel/debug/tracing/events"; |
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static void __tracing_path_set(const char *tracing, const char *mountpoint) |
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{ |
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snprintf(tracing_mnt, sizeof(tracing_mnt), "%s", mountpoint); |
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snprintf(tracing_path, sizeof(tracing_path), "%s/%s", |
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mountpoint, tracing); |
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snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s", |
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mountpoint, tracing, "events"); |
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} |
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static const char *tracing_path_tracefs_mount(void) |
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{ |
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const char *mnt; |
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mnt = tracefs__mount(); |
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if (!mnt) |
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return NULL; |
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__tracing_path_set("", mnt); |
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return tracing_path; |
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} |
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static const char *tracing_path_debugfs_mount(void) |
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{ |
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const char *mnt; |
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mnt = debugfs__mount(); |
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if (!mnt) |
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return NULL; |
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__tracing_path_set("tracing/", mnt); |
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return tracing_path; |
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} |
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const char *tracing_path_mount(void) |
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{ |
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const char *mnt; |
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mnt = tracing_path_tracefs_mount(); |
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if (mnt) |
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return mnt; |
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mnt = tracing_path_debugfs_mount(); |
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return mnt; |
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} |
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void tracing_path_set(const char *mntpt) |
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{ |
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__tracing_path_set("tracing/", mntpt); |
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} |
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char *get_tracing_file(const char *name) |
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{ |
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char *file; |
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if (asprintf(&file, "%s/%s", tracing_path_mount(), name) < 0) |
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return NULL; |
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return file; |
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} |
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void put_tracing_file(char *file) |
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{ |
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free(file); |
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} |
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char *get_events_file(const char *name) |
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{ |
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char *file; |
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if (asprintf(&file, "%s/events/%s", tracing_path_mount(), name) < 0) |
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return NULL; |
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return file; |
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} |
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void put_events_file(char *file) |
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{ |
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free(file); |
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} |
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DIR *tracing_events__opendir(void) |
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{ |
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DIR *dir = NULL; |
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char *path = get_tracing_file("events"); |
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if (path) { |
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dir = opendir(path); |
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put_events_file(path); |
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} |
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return dir; |
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} |
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int tracing_path__strerror_open_tp(int err, char *buf, size_t size, |
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const char *sys, const char *name) |
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{ |
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char sbuf[128]; |
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char filename[PATH_MAX]; |
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snprintf(filename, PATH_MAX, "%s/%s", sys, name ?: "*"); |
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switch (err) { |
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case ENOENT: |
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/* |
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* We will get here if we can't find the tracepoint, but one of |
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* debugfs or tracefs is configured, which means you probably |
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* want some tracepoint which wasn't compiled in your kernel. |
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* - jirka |
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*/ |
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if (debugfs__configured() || tracefs__configured()) { |
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/* sdt markers */ |
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if (!strncmp(filename, "sdt_", 4)) { |
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snprintf(buf, size, |
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"Error:\tFile %s/%s not found.\n" |
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"Hint:\tSDT event cannot be directly recorded on.\n" |
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"\tPlease first use 'perf probe %s:%s' before recording it.\n", |
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tracing_events_path, filename, sys, name); |
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} else { |
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snprintf(buf, size, |
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"Error:\tFile %s/%s not found.\n" |
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"Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n", |
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tracing_events_path, filename); |
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} |
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break; |
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} |
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snprintf(buf, size, "%s", |
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"Error:\tUnable to find debugfs/tracefs\n" |
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"Hint:\tWas your kernel compiled with debugfs/tracefs support?\n" |
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"Hint:\tIs the debugfs/tracefs filesystem mounted?\n" |
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"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'"); |
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break; |
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case EACCES: { |
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snprintf(buf, size, |
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"Error:\tNo permissions to read %s/%s\n" |
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"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n", |
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tracing_events_path, filename, tracing_path_mount()); |
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} |
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break; |
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default: |
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snprintf(buf, size, "%s", str_error_r(err, sbuf, sizeof(sbuf))); |
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break; |
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} |
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return 0; |
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}
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