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-rw-r--r--tools/lib/api/fs/fs.c165
1 files changed, 153 insertions, 12 deletions
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 128ef6332a6b..459599d1b6c4 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -1,7 +1,6 @@
-/* TODO merge/factor in debugfs.c here */
-
#include <ctype.h>
#include <errno.h>
+#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
@@ -11,10 +10,29 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
+#include <sys/mount.h>
-#include "debugfs.h"
#include "fs.h"
+#define _STR(x) #x
+#define STR(x) _STR(x)
+
+#ifndef SYSFS_MAGIC
+#define SYSFS_MAGIC 0x62656572
+#endif
+
+#ifndef PROC_SUPER_MAGIC
+#define PROC_SUPER_MAGIC 0x9fa0
+#endif
+
+#ifndef DEBUGFS_MAGIC
+#define DEBUGFS_MAGIC 0x64626720
+#endif
+
+#ifndef TRACEFS_MAGIC
+#define TRACEFS_MAGIC 0x74726163
+#endif
+
static const char * const sysfs__fs_known_mountpoints[] = {
"/sys",
0,
@@ -25,19 +43,48 @@ static const char * const procfs__known_mountpoints[] = {
0,
};
+#ifndef DEBUGFS_DEFAULT_PATH
+#define DEBUGFS_DEFAULT_PATH "/sys/kernel/debug"
+#endif
+
+static const char * const debugfs__known_mountpoints[] = {
+ DEBUGFS_DEFAULT_PATH,
+ "/debug",
+ 0,
+};
+
+
+#ifndef TRACEFS_DEFAULT_PATH
+#define TRACEFS_DEFAULT_PATH "/sys/kernel/tracing"
+#endif
+
+static const char * const tracefs__known_mountpoints[] = {
+ TRACEFS_DEFAULT_PATH,
+ "/sys/kernel/debug/tracing",
+ "/tracing",
+ "/trace",
+ 0,
+};
+
struct fs {
const char *name;
const char * const *mounts;
- char path[PATH_MAX + 1];
+ char path[PATH_MAX];
bool found;
long magic;
};
enum {
- FS__SYSFS = 0,
- FS__PROCFS = 1,
+ FS__SYSFS = 0,
+ FS__PROCFS = 1,
+ FS__DEBUGFS = 2,
+ FS__TRACEFS = 3,
};
+#ifndef TRACEFS_MAGIC
+#define TRACEFS_MAGIC 0x74726163
+#endif
+
static struct fs fs__entries[] = {
[FS__SYSFS] = {
.name = "sysfs",
@@ -49,6 +96,16 @@ static struct fs fs__entries[] = {
.mounts = procfs__known_mountpoints,
.magic = PROC_SUPER_MAGIC,
},
+ [FS__DEBUGFS] = {
+ .name = "debugfs",
+ .mounts = debugfs__known_mountpoints,
+ .magic = DEBUGFS_MAGIC,
+ },
+ [FS__TRACEFS] = {
+ .name = "tracefs",
+ .mounts = tracefs__known_mountpoints,
+ .magic = TRACEFS_MAGIC,
+ },
};
static bool fs__read_mounts(struct fs *fs)
@@ -159,14 +216,54 @@ static const char *fs__mountpoint(int idx)
return fs__get_mountpoint(fs);
}
-#define FS__MOUNTPOINT(name, idx) \
-const char *name##__mountpoint(void) \
-{ \
- return fs__mountpoint(idx); \
+static const char *mount_overload(struct fs *fs)
+{
+ size_t name_len = strlen(fs->name);
+ /* "PERF_" + name + "_ENVIRONMENT" + '\0' */
+ char upper_name[5 + name_len + 12 + 1];
+
+ snprintf(upper_name, name_len, "PERF_%s_ENVIRONMENT", fs->name);
+ mem_toupper(upper_name, name_len);
+
+ return getenv(upper_name) ?: *fs->mounts;
+}
+
+static const char *fs__mount(int idx)
+{
+ struct fs *fs = &fs__entries[idx];
+ const char *mountpoint;
+
+ if (fs__mountpoint(idx))
+ return (const char *)fs->path;
+
+ mountpoint = mount_overload(fs);
+
+ if (mount(NULL, mountpoint, fs->name, 0, NULL) < 0)
+ return NULL;
+
+ return fs__check_mounts(fs) ? fs->path : NULL;
+}
+
+#define FS(name, idx) \
+const char *name##__mountpoint(void) \
+{ \
+ return fs__mountpoint(idx); \
+} \
+ \
+const char *name##__mount(void) \
+{ \
+ return fs__mount(idx); \
+} \
+ \
+bool name##__configured(void) \
+{ \
+ return name##__mountpoint() != NULL; \
}
-FS__MOUNTPOINT(sysfs, FS__SYSFS);
-FS__MOUNTPOINT(procfs, FS__PROCFS);
+FS(sysfs, FS__SYSFS);
+FS(procfs, FS__PROCFS);
+FS(debugfs, FS__DEBUGFS);
+FS(tracefs, FS__TRACEFS);
int filename__read_int(const char *filename, int *value)
{
@@ -185,6 +282,50 @@ int filename__read_int(const char *filename, int *value)
return err;
}
+int filename__read_ull(const char *filename, unsigned long long *value)
+{
+ char line[64];
+ int fd = open(filename, O_RDONLY), err = -1;
+
+ if (fd < 0)
+ return -1;
+
+ if (read(fd, line, sizeof(line)) > 0) {
+ *value = strtoull(line, NULL, 10);
+ if (*value != ULLONG_MAX)
+ err = 0;
+ }
+
+ close(fd);
+ return err;
+}
+
+int sysfs__read_ull(const char *entry, unsigned long long *value)
+{
+ char path[PATH_MAX];
+ const char *sysfs = sysfs__mountpoint();
+
+ if (!sysfs)
+ return -1;
+
+ snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
+
+ return filename__read_ull(path, value);
+}
+
+int sysfs__read_int(const char *entry, int *value)
+{
+ char path[PATH_MAX];
+ const char *sysfs = sysfs__mountpoint();
+
+ if (!sysfs)
+ return -1;
+
+ snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
+
+ return filename__read_int(path, value);
+}
+
int sysctl__read_int(const char *sysctl, int *value)
{
char path[PATH_MAX];