From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/tools/lib/api/fs/Build | 4 + kernel/tools/lib/api/fs/debugfs.c | 118 ++++++++++++++++++++++ kernel/tools/lib/api/fs/debugfs.h | 23 +++++ kernel/tools/lib/api/fs/findfs.c | 63 ++++++++++++ kernel/tools/lib/api/fs/findfs.h | 23 +++++ kernel/tools/lib/api/fs/fs.c | 199 ++++++++++++++++++++++++++++++++++++++ kernel/tools/lib/api/fs/fs.h | 17 ++++ kernel/tools/lib/api/fs/tracefs.c | 78 +++++++++++++++ kernel/tools/lib/api/fs/tracefs.h | 21 ++++ 9 files changed, 546 insertions(+) create mode 100644 kernel/tools/lib/api/fs/Build create mode 100644 kernel/tools/lib/api/fs/debugfs.c create mode 100644 kernel/tools/lib/api/fs/debugfs.h create mode 100644 kernel/tools/lib/api/fs/findfs.c create mode 100644 kernel/tools/lib/api/fs/findfs.h create mode 100644 kernel/tools/lib/api/fs/fs.c create mode 100644 kernel/tools/lib/api/fs/fs.h create mode 100644 kernel/tools/lib/api/fs/tracefs.c create mode 100644 kernel/tools/lib/api/fs/tracefs.h (limited to 'kernel/tools/lib/api/fs') diff --git a/kernel/tools/lib/api/fs/Build b/kernel/tools/lib/api/fs/Build new file mode 100644 index 000000000..6de5a4f0b --- /dev/null +++ b/kernel/tools/lib/api/fs/Build @@ -0,0 +1,4 @@ +libapi-y += fs.o +libapi-y += debugfs.o +libapi-y += findfs.o +libapi-y += tracefs.o diff --git a/kernel/tools/lib/api/fs/debugfs.c b/kernel/tools/lib/api/fs/debugfs.c new file mode 100644 index 000000000..8305b3e9d --- /dev/null +++ b/kernel/tools/lib/api/fs/debugfs.c @@ -0,0 +1,118 @@ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "debugfs.h" + +#ifndef DEBUGFS_DEFAULT_PATH +#define DEBUGFS_DEFAULT_PATH "/sys/kernel/debug" +#endif + +char debugfs_mountpoint[PATH_MAX + 1] = DEBUGFS_DEFAULT_PATH; + +static const char * const debugfs_known_mountpoints[] = { + DEBUGFS_DEFAULT_PATH, + "/debug", + 0, +}; + +static bool debugfs_found; + +bool debugfs_configured(void) +{ + return debugfs_find_mountpoint() != NULL; +} + +/* find the path to the mounted debugfs */ +const char *debugfs_find_mountpoint(void) +{ + const char *ret; + + if (debugfs_found) + return (const char *)debugfs_mountpoint; + + ret = find_mountpoint("debugfs", (long) DEBUGFS_MAGIC, + debugfs_mountpoint, PATH_MAX + 1, + debugfs_known_mountpoints); + if (ret) + debugfs_found = true; + + return ret; +} + +/* mount the debugfs somewhere if it's not mounted */ +char *debugfs_mount(const char *mountpoint) +{ + /* see if it's already mounted */ + if (debugfs_find_mountpoint()) + goto out; + + /* if not mounted and no argument */ + if (mountpoint == NULL) { + /* see if environment variable set */ + mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT); + /* if no environment variable, use default */ + if (mountpoint == NULL) + mountpoint = DEBUGFS_DEFAULT_PATH; + } + + if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0) + return NULL; + + /* save the mountpoint */ + debugfs_found = true; + strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint)); +out: + return debugfs_mountpoint; +} + +int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename) +{ + char sbuf[128]; + + switch (err) { + case ENOENT: + if (debugfs_found) { + snprintf(buf, size, + "Error:\tFile %s/%s not found.\n" + "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n", + debugfs_mountpoint, filename); + break; + } + snprintf(buf, size, "%s", + "Error:\tUnable to find debugfs\n" + "Hint:\tWas your kernel compiled with debugfs support?\n" + "Hint:\tIs the debugfs filesystem mounted?\n" + "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'"); + break; + case EACCES: + snprintf(buf, size, + "Error:\tNo permissions to read %s/%s\n" + "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n", + debugfs_mountpoint, filename, debugfs_mountpoint); + break; + default: + snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf))); + break; + } + + return 0; +} + +int debugfs__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name) +{ + char path[PATH_MAX]; + + snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*"); + + return debugfs__strerror_open(err, buf, size, path); +} diff --git a/kernel/tools/lib/api/fs/debugfs.h b/kernel/tools/lib/api/fs/debugfs.h new file mode 100644 index 000000000..455023698 --- /dev/null +++ b/kernel/tools/lib/api/fs/debugfs.h @@ -0,0 +1,23 @@ +#ifndef __API_DEBUGFS_H__ +#define __API_DEBUGFS_H__ + +#include "findfs.h" + +#ifndef DEBUGFS_MAGIC +#define DEBUGFS_MAGIC 0x64626720 +#endif + +#ifndef PERF_DEBUGFS_ENVIRONMENT +#define PERF_DEBUGFS_ENVIRONMENT "PERF_DEBUGFS_DIR" +#endif + +bool debugfs_configured(void); +const char *debugfs_find_mountpoint(void); +char *debugfs_mount(const char *mountpoint); + +extern char debugfs_mountpoint[]; + +int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename); +int debugfs__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name); + +#endif /* __API_DEBUGFS_H__ */ diff --git a/kernel/tools/lib/api/fs/findfs.c b/kernel/tools/lib/api/fs/findfs.c new file mode 100644 index 000000000..49946cb6d --- /dev/null +++ b/kernel/tools/lib/api/fs/findfs.c @@ -0,0 +1,63 @@ +#include +#include +#include +#include +#include +#include + +#include "findfs.h" + +/* verify that a mountpoint is actually the type we want */ + +int valid_mountpoint(const char *mount, long magic) +{ + struct statfs st_fs; + + if (statfs(mount, &st_fs) < 0) + return -ENOENT; + else if ((long)st_fs.f_type != magic) + return -ENOENT; + + return 0; +} + +/* find the path to a mounted file system */ +const char *find_mountpoint(const char *fstype, long magic, + char *mountpoint, int len, + const char * const *known_mountpoints) +{ + const char * const *ptr; + char format[128]; + char type[100]; + FILE *fp; + + if (known_mountpoints) { + ptr = known_mountpoints; + while (*ptr) { + if (valid_mountpoint(*ptr, magic) == 0) { + strncpy(mountpoint, *ptr, len - 1); + mountpoint[len-1] = 0; + return mountpoint; + } + ptr++; + } + } + + /* give up and parse /proc/mounts */ + fp = fopen("/proc/mounts", "r"); + if (fp == NULL) + return NULL; + + snprintf(format, 128, "%%*s %%%ds %%99s %%*s %%*d %%*d\n", len); + + while (fscanf(fp, format, mountpoint, type) == 2) { + if (strcmp(type, fstype) == 0) + break; + } + fclose(fp); + + if (strcmp(type, fstype) != 0) + return NULL; + + return mountpoint; +} diff --git a/kernel/tools/lib/api/fs/findfs.h b/kernel/tools/lib/api/fs/findfs.h new file mode 100644 index 000000000..b6f5d05ac --- /dev/null +++ b/kernel/tools/lib/api/fs/findfs.h @@ -0,0 +1,23 @@ +#ifndef __API_FINDFS_H__ +#define __API_FINDFS_H__ + +#include + +#define _STR(x) #x +#define STR(x) _STR(x) + +/* + * On most systems would have given us this, but not on some systems + * (e.g. GNU/Hurd). + */ +#ifndef PATH_MAX +#define PATH_MAX 4096 +#endif + +const char *find_mountpoint(const char *fstype, long magic, + char *mountpoint, int len, + const char * const *known_mountpoints); + +int valid_mountpoint(const char *mount, long magic); + +#endif /* __API_FINDFS_H__ */ diff --git a/kernel/tools/lib/api/fs/fs.c b/kernel/tools/lib/api/fs/fs.c new file mode 100644 index 000000000..128ef6332 --- /dev/null +++ b/kernel/tools/lib/api/fs/fs.c @@ -0,0 +1,199 @@ +/* TODO merge/factor in debugfs.c here */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "debugfs.h" +#include "fs.h" + +static const char * const sysfs__fs_known_mountpoints[] = { + "/sys", + 0, +}; + +static const char * const procfs__known_mountpoints[] = { + "/proc", + 0, +}; + +struct fs { + const char *name; + const char * const *mounts; + char path[PATH_MAX + 1]; + bool found; + long magic; +}; + +enum { + FS__SYSFS = 0, + FS__PROCFS = 1, +}; + +static struct fs fs__entries[] = { + [FS__SYSFS] = { + .name = "sysfs", + .mounts = sysfs__fs_known_mountpoints, + .magic = SYSFS_MAGIC, + }, + [FS__PROCFS] = { + .name = "proc", + .mounts = procfs__known_mountpoints, + .magic = PROC_SUPER_MAGIC, + }, +}; + +static bool fs__read_mounts(struct fs *fs) +{ + bool found = false; + char type[100]; + FILE *fp; + + fp = fopen("/proc/mounts", "r"); + if (fp == NULL) + return NULL; + + while (!found && + fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n", + fs->path, type) == 2) { + + if (strcmp(type, fs->name) == 0) + found = true; + } + + fclose(fp); + return fs->found = found; +} + +static int fs__valid_mount(const char *fs, long magic) +{ + struct statfs st_fs; + + if (statfs(fs, &st_fs) < 0) + return -ENOENT; + else if ((long)st_fs.f_type != magic) + return -ENOENT; + + return 0; +} + +static bool fs__check_mounts(struct fs *fs) +{ + const char * const *ptr; + + ptr = fs->mounts; + while (*ptr) { + if (fs__valid_mount(*ptr, fs->magic) == 0) { + fs->found = true; + strcpy(fs->path, *ptr); + return true; + } + ptr++; + } + + return false; +} + +static void mem_toupper(char *f, size_t len) +{ + while (len) { + *f = toupper(*f); + f++; + len--; + } +} + +/* + * Check for "NAME_PATH" environment variable to override fs location (for + * testing). This matches the recommendation in Documentation/sysfs-rules.txt + * for SYSFS_PATH. + */ +static bool fs__env_override(struct fs *fs) +{ + char *override_path; + size_t name_len = strlen(fs->name); + /* name + "_PATH" + '\0' */ + char upper_name[name_len + 5 + 1]; + memcpy(upper_name, fs->name, name_len); + mem_toupper(upper_name, name_len); + strcpy(&upper_name[name_len], "_PATH"); + + override_path = getenv(upper_name); + if (!override_path) + return false; + + fs->found = true; + strncpy(fs->path, override_path, sizeof(fs->path)); + return true; +} + +static const char *fs__get_mountpoint(struct fs *fs) +{ + if (fs__env_override(fs)) + return fs->path; + + if (fs__check_mounts(fs)) + return fs->path; + + if (fs__read_mounts(fs)) + return fs->path; + + return NULL; +} + +static const char *fs__mountpoint(int idx) +{ + struct fs *fs = &fs__entries[idx]; + + if (fs->found) + return (const char *)fs->path; + + return fs__get_mountpoint(fs); +} + +#define FS__MOUNTPOINT(name, idx) \ +const char *name##__mountpoint(void) \ +{ \ + return fs__mountpoint(idx); \ +} + +FS__MOUNTPOINT(sysfs, FS__SYSFS); +FS__MOUNTPOINT(procfs, FS__PROCFS); + +int filename__read_int(const char *filename, int *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 = atoi(line); + err = 0; + } + + close(fd); + return err; +} + +int sysctl__read_int(const char *sysctl, int *value) +{ + char path[PATH_MAX]; + const char *procfs = procfs__mountpoint(); + + if (!procfs) + return -1; + + snprintf(path, sizeof(path), "%s/sys/%s", procfs, sysctl); + + return filename__read_int(path, value); +} diff --git a/kernel/tools/lib/api/fs/fs.h b/kernel/tools/lib/api/fs/fs.h new file mode 100644 index 000000000..6caa2bbc6 --- /dev/null +++ b/kernel/tools/lib/api/fs/fs.h @@ -0,0 +1,17 @@ +#ifndef __API_FS__ +#define __API_FS__ + +#ifndef SYSFS_MAGIC +#define SYSFS_MAGIC 0x62656572 +#endif + +#ifndef PROC_SUPER_MAGIC +#define PROC_SUPER_MAGIC 0x9fa0 +#endif + +const char *sysfs__mountpoint(void); +const char *procfs__mountpoint(void); + +int filename__read_int(const char *filename, int *value); +int sysctl__read_int(const char *sysctl, int *value); +#endif /* __API_FS__ */ diff --git a/kernel/tools/lib/api/fs/tracefs.c b/kernel/tools/lib/api/fs/tracefs.c new file mode 100644 index 000000000..e4aa9688b --- /dev/null +++ b/kernel/tools/lib/api/fs/tracefs.c @@ -0,0 +1,78 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "tracefs.h" + +#ifndef TRACEFS_DEFAULT_PATH +#define TRACEFS_DEFAULT_PATH "/sys/kernel/tracing" +#endif + +char tracefs_mountpoint[PATH_MAX + 1] = TRACEFS_DEFAULT_PATH; + +static const char * const tracefs_known_mountpoints[] = { + TRACEFS_DEFAULT_PATH, + "/sys/kernel/debug/tracing", + "/tracing", + "/trace", + 0, +}; + +static bool tracefs_found; + +bool tracefs_configured(void) +{ + return tracefs_find_mountpoint() != NULL; +} + +/* find the path to the mounted tracefs */ +const char *tracefs_find_mountpoint(void) +{ + const char *ret; + + if (tracefs_found) + return (const char *)tracefs_mountpoint; + + ret = find_mountpoint("tracefs", (long) TRACEFS_MAGIC, + tracefs_mountpoint, PATH_MAX + 1, + tracefs_known_mountpoints); + + if (ret) + tracefs_found = true; + + return ret; +} + +/* mount the tracefs somewhere if it's not mounted */ +char *tracefs_mount(const char *mountpoint) +{ + /* see if it's already mounted */ + if (tracefs_find_mountpoint()) + goto out; + + /* if not mounted and no argument */ + if (mountpoint == NULL) { + /* see if environment variable set */ + mountpoint = getenv(PERF_TRACEFS_ENVIRONMENT); + /* if no environment variable, use default */ + if (mountpoint == NULL) + mountpoint = TRACEFS_DEFAULT_PATH; + } + + if (mount(NULL, mountpoint, "tracefs", 0, NULL) < 0) + return NULL; + + /* save the mountpoint */ + tracefs_found = true; + strncpy(tracefs_mountpoint, mountpoint, sizeof(tracefs_mountpoint)); +out: + return tracefs_mountpoint; +} diff --git a/kernel/tools/lib/api/fs/tracefs.h b/kernel/tools/lib/api/fs/tracefs.h new file mode 100644 index 000000000..da780ac49 --- /dev/null +++ b/kernel/tools/lib/api/fs/tracefs.h @@ -0,0 +1,21 @@ +#ifndef __API_TRACEFS_H__ +#define __API_TRACEFS_H__ + +#include "findfs.h" + +#ifndef TRACEFS_MAGIC +#define TRACEFS_MAGIC 0x74726163 +#endif + +#ifndef PERF_TRACEFS_ENVIRONMENT +#define PERF_TRACEFS_ENVIRONMENT "PERF_TRACEFS_DIR" +#endif + +bool tracefs_configured(void); +const char *tracefs_find_mountpoint(void); +int tracefs_valid_mountpoint(const char *debugfs); +char *tracefs_mount(const char *mountpoint); + +extern char tracefs_mountpoint[]; + +#endif /* __API_DEBUGFS_H__ */ -- cgit 1.2.3-korg