perf tools: Mount debugfs automatically
Mount debugfs filesystem under '/sys/kernel/debug', if it's not mounted. Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> LKML-Reference: <4B387090.7080407@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>hifive-unleashed-5.1
parent
07b139c8c8
commit
29c52aa230
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@ -388,7 +388,7 @@ static int run_argv(int *argcp, const char ***argv)
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/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
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/* mini /proc/mounts parser: searching for "^blah /mount/point debugfs" */
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static void get_debugfs_mntpt(void)
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static void get_debugfs_mntpt(void)
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{
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{
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const char *path = debugfs_find_mountpoint();
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const char *path = debugfs_mount(NULL);
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if (path)
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if (path)
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strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
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strncpy(debugfs_mntpt, path, sizeof(debugfs_mntpt));
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@ -106,16 +106,14 @@ int debugfs_valid_entry(const char *path)
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return 0;
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return 0;
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}
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}
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/* mount the debugfs somewhere */
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/* mount the debugfs somewhere if it's not mounted */
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int debugfs_mount(const char *mountpoint)
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char *debugfs_mount(const char *mountpoint)
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{
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{
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char mountcmd[128];
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/* see if it's already mounted */
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/* see if it's already mounted */
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if (debugfs_find_mountpoint()) {
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if (debugfs_find_mountpoint()) {
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debugfs_premounted = 1;
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debugfs_premounted = 1;
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return 0;
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return debugfs_mountpoint;
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}
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}
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/* if not mounted and no argument */
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/* if not mounted and no argument */
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@ -127,13 +125,13 @@ int debugfs_mount(const char *mountpoint)
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mountpoint = "/sys/kernel/debug";
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mountpoint = "/sys/kernel/debug";
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}
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}
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if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)
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return NULL;
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/* save the mountpoint */
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/* save the mountpoint */
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strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
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strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
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/* mount it */
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return debugfs_mountpoint;
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snprintf(mountcmd, sizeof(mountcmd),
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"/bin/mount -t debugfs debugfs %s", mountpoint);
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return system(mountcmd);
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}
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}
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/* umount the debugfs */
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/* umount the debugfs */
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@ -15,7 +15,7 @@
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extern const char *debugfs_find_mountpoint(void);
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extern const char *debugfs_find_mountpoint(void);
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extern int debugfs_valid_mountpoint(const char *debugfs);
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extern int debugfs_valid_mountpoint(const char *debugfs);
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extern int debugfs_valid_entry(const char *path);
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extern int debugfs_valid_entry(const char *path);
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extern int debugfs_mount(const char *mountpoint);
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extern char *debugfs_mount(const char *mountpoint);
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extern int debugfs_umount(void);
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extern int debugfs_umount(void);
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extern int debugfs_write(const char *entry, const char *value);
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extern int debugfs_write(const char *entry, const char *value);
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extern int debugfs_read(const char *entry, char *buffer, size_t size);
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extern int debugfs_read(const char *entry, char *buffer, size_t size);
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