+/*
+ * Channel measurement related functions
+ */
+static ssize_t
+chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off,
+ size_t count)
+{
+ struct channel_path *chp;
+ unsigned int size;
+
+ chp = to_channelpath(container_of(kobj, struct device, kobj));
+ if (!chp->cmg_chars)
+ return 0;
+
+ size = sizeof(struct cmg_chars);
+
+ if (off > size)
+ return 0;
+ if (off + count > size)
+ count = size - off;
+ memcpy(buf, chp->cmg_chars + off, count);
+ return count;
+}
+
+static struct bin_attribute chp_measurement_chars_attr = {
+ .attr = {
+ .name = "measurement_chars",
+ .mode = S_IRUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(struct cmg_chars),
+ .read = chp_measurement_chars_read,
+};
+
+static void
+chp_measurement_copy_block(struct cmg_entry *buf,
+ struct channel_subsystem *css, int chpid)
+{
+ void *area;
+ struct cmg_entry *entry, reference_buf;
+ int idx;
+
+ if (chpid < 128) {
+ area = css->cub_addr1;
+ idx = chpid;
+ } else {
+ area = css->cub_addr2;
+ idx = chpid - 128;
+ }
+ entry = area + (idx * sizeof(struct cmg_entry));
+ do {
+ memcpy(buf, entry, sizeof(*entry));
+ memcpy(&reference_buf, entry, sizeof(*entry));
+ } while (reference_buf.values[0] != buf->values[0]);
+}
+
+static ssize_t
+chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ struct channel_path *chp;
+ struct channel_subsystem *css;
+ unsigned int size;
+
+ chp = to_channelpath(container_of(kobj, struct device, kobj));
+ css = to_css(chp->dev.parent);
+
+ size = sizeof(struct cmg_entry);
+
+ /* Only allow single reads. */
+ if (off || count < size)
+ return 0;
+ chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id);
+ count = size;
+ return count;
+}
+
+static struct bin_attribute chp_measurement_attr = {
+ .attr = {
+ .name = "measurement",
+ .mode = S_IRUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = sizeof(struct cmg_entry),
+ .read = chp_measurement_read,
+};
+
+static void
+chsc_remove_chp_cmg_attr(struct channel_path *chp)
+{
+ sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_chars_attr);
+ sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_attr);
+}
+
+static int
+chsc_add_chp_cmg_attr(struct channel_path *chp)
+{
+ int ret;
+
+ ret = sysfs_create_bin_file(&chp->dev.kobj,
+ &chp_measurement_chars_attr);
+ if (ret)
+ return ret;
+ ret = sysfs_create_bin_file(&chp->dev.kobj, &chp_measurement_attr);
+ if (ret)
+ sysfs_remove_bin_file(&chp->dev.kobj,
+ &chp_measurement_chars_attr);
+ return ret;
+}
+
+static void
+chsc_remove_cmg_attr(struct channel_subsystem *css)
+{
+ int i;
+
+ for (i = 0; i <= __MAX_CHPID; i++) {
+ if (!css->chps[i])