dumpstate: report per-partition MMC performance

(Cherry pick from commit 540e3de99f)

Change-Id: If5cabe186d8377056effa1c0672a90e277cd7221

cmds/dumpstate/dumpstate.c

@@ -99,6 +99,67 @@ static void dump_dev_files(const char *title, const char *driverpath, const char
     closedir(d);
 }
 
+static bool skip_not_stat(const char *path) {
+    static const char stat[] = "/stat";
+    size_t len = strlen(path);
+    if (path[len - 1] == '/') { /* Directory? */
+        return false;
+    }
+    return strcmp(path + len - sizeof(stat) + 1, stat); /* .../stat? */
+}
+
+static const char mmcblk0[] = "/sys/block/mmcblk0/";
+
+static int dump_stat_from_fd(const char *title __unused, const char *path, int fd) {
+    unsigned long fields[11], read_perf, write_perf;
+    bool z;
+    char *cp, *buffer = NULL;
+    size_t i = 0;
+    FILE *fp = fdopen(fd, "rb");
+    getline(&buffer, &i, fp);
+    fclose(fp);
+    if (!buffer) {
+        return -errno;
+    }
+    i = strlen(buffer);
+    while ((i > 0) && (buffer[i - 1] == '\n')) {
+        buffer[--i] = '\0';
+    }
+    if (!*buffer) {
+        free(buffer);
+        return 0;
+    }
+    z = true;
+    for (cp = buffer, i = 0; i < (sizeof(fields) / sizeof(fields[0])); ++i) {
+        fields[i] = strtol(cp, &cp, 0);
+        if (fields[i] != 0) {
+            z = false;
+        }
+    }
+    if (z) { /* never accessed */
+        free(buffer);
+        return 0;
+    }
+
+    if (!strncmp(path, mmcblk0, sizeof(mmcblk0) - 1)) {
+        path += sizeof(mmcblk0) - 1;
+    }
+
+    printf("%s: %s\n", path, buffer);
+    free(buffer);
+
+    read_perf = 0;
+    if (fields[3]) {
+        read_perf = 512 * fields[2] / fields[3];
+    }
+    write_perf = 0;
+    if (fields[7]) {
+        write_perf = 512 * fields[6] / fields[7];
+    }
+    printf("%s: read: %luKB/s write: %luKB/s\n", path, read_perf, write_perf);
+    return 0;
+}
+
 /* dumps the current system state to stdout */
 static void dumpstate() {
     time_t now = time(NULL);
@@ -133,7 +194,7 @@ static void dumpstate() {
 
     dump_dev_files("TRUSTY VERSION", "/sys/bus/platform/drivers/trusty", "trusty_version");
     run_command("UPTIME", 10, "uptime", NULL);
-    dump_file("MMC PERF", "/sys/block/mmcblk0/stat");
+    dump_files("UPTIME MMC PERF", mmcblk0, skip_not_stat, dump_stat_from_fd);
     dump_file("MEMORY INFO", "/proc/meminfo");
     run_command("CPU INFO", 10, "top", "-n", "1", "-d", "1", "-m", "30", "-t", NULL);
     run_command("PROCRANK", 20, "procrank", NULL);

cmds/dumpstate/dumpstate.h

@@ -35,6 +35,16 @@ int dump_file(const char *title, const char *path);
  */
 int dump_file_from_fd(const char *title, const char *path, int fd);
 
+/* calls skip to gate calling dump_from_fd recursively
+ * in the specified directory. dump_from_fd defaults to
+ * dump_file_from_fd above when set to NULL. skip defaults
+ * to false when set to NULL. dump_from_fd will always be
+ * called with title NULL.
+ */
+int dump_files(const char *title, const char *dir,
+        bool (*skip)(const char *path),
+        int (*dump_from_fd)(const char *title, const char *path, int fd));
+
 /* forks a command and waits for it to finish -- terminate args with NULL */
 int run_command(const char *title, int timeout_seconds, const char *command, ...);
 

cmds/dumpstate/utils.c

@@ -310,6 +310,75 @@ int dump_file(const char *title, const char *path) {
     return _dump_file_from_fd(title, path, fd);
 }
 
+/* calls skip to gate calling dump_from_fd recursively
+ * in the specified directory. dump_from_fd defaults to
+ * dump_file_from_fd above when set to NULL. skip defaults
+ * to false when set to NULL. dump_from_fd will always be
+ * called with title NULL.
+ */
+int dump_files(const char *title, const char *dir,
+        bool (*skip)(const char *path),
+        int (*dump_from_fd)(const char *title, const char *path, int fd)) {
+    DIR *dirp;
+    struct dirent *d;
+    char *newpath = NULL;
+    char *slash = "/";
+    int fd, retval = 0;
+
+    if (title) {
+        printf("------ %s (%s) ------\n", title, dir);
+    }
+
+    if (dir[strlen(dir) - 1] == '/') {
+        ++slash;
+    }
+    dirp = opendir(dir);
+    if (dirp == NULL) {
+        retval = -errno;
+        fprintf(stderr, "%s: %s\n", dir, strerror(errno));
+        return retval;
+    }
+
+    if (!dump_from_fd) {
+        dump_from_fd = dump_file_from_fd;
+    }
+    for (; ((d = readdir(dirp))); free(newpath), newpath = NULL) {
+        if ((d->d_name[0] == '.')
+         && (((d->d_name[1] == '.') && (d->d_name[2] == '\0'))
+          || (d->d_name[1] == '\0'))) {
+            continue;
+        }
+        asprintf(&newpath, "%s%s%s%s", dir, slash, d->d_name,
+                 (d->d_type == DT_DIR) ? "/" : "");
+        if (!newpath) {
+            retval = -errno;
+            continue;
+        }
+        if (skip && (*skip)(newpath)) {
+            continue;
+        }
+        if (d->d_type == DT_DIR) {
+            int ret = dump_files(NULL, newpath, skip, dump_from_fd);
+            if (ret < 0) {
+                retval = ret;
+            }
+            continue;
+        }
+        fd = TEMP_FAILURE_RETRY(open(newpath, O_RDONLY | O_NONBLOCK | O_CLOEXEC));
+        if (fd < 0) {
+            retval = fd;
+            printf("*** %s: %s\n", newpath, strerror(errno));
+            continue;
+        }
+        (*dump_from_fd)(NULL, newpath, fd);
+    }
+    closedir(dirp);
+    if (title) {
+        printf("\n");
+    }
+    return retval;
+}
+
 /* fd must have been opened with the flag O_NONBLOCK. With this flag set,
  * it's possible to avoid issues where opening the file itself can get
  * stuck.