diff options
Diffstat (limited to 'drivers/s390/cio/chp.c')
-rw-r--r-- | drivers/s390/cio/chp.c | 141 |
1 files changed, 81 insertions, 60 deletions
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c index 675d7ed82356..a07bbecba61c 100644 --- a/drivers/s390/cio/chp.c +++ b/drivers/s390/cio/chp.c @@ -127,10 +127,9 @@ static int s390_vary_chpid(struct chp_id chpid, int on) /* * Channel measurement related functions */ -static ssize_t chp_measurement_chars_read(struct file *filp, - struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t measurement_chars_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) { struct channel_path *chp; struct device *device; @@ -143,87 +142,79 @@ static ssize_t chp_measurement_chars_read(struct file *filp, return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, sizeof(chp->cmg_chars)); } +static BIN_ATTR_ADMIN_RO(measurement_chars, sizeof(struct cmg_chars)); -static const struct bin_attribute chp_measurement_chars_attr = { - .attr = { - .name = "measurement_chars", - .mode = S_IRUSR, - }, - .size = sizeof(struct cmg_chars), - .read = chp_measurement_chars_read, -}; - -static void chp_measurement_copy_block(struct cmg_entry *buf, - struct channel_subsystem *css, - struct chp_id chpid) -{ - void *area; - struct cmg_entry *entry, reference_buf; - int idx; - - if (chpid.id < 128) { - area = css->cub_addr1; - idx = chpid.id; - } else { - area = css->cub_addr2; - idx = chpid.id - 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 file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) +static ssize_t chp_measurement_copy_block(void *buf, loff_t off, size_t count, + struct kobject *kobj, bool extended) { struct channel_path *chp; struct channel_subsystem *css; struct device *device; unsigned int size; + void *area, *entry; + int id, idx; device = kobj_to_dev(kobj); chp = to_channelpath(device); css = to_css(chp->dev.parent); + id = chp->chpid.id; - size = sizeof(struct cmg_entry); + if (extended) { + /* Check if extended measurement data is available. */ + if (!chp->extended) + return 0; + + size = sizeof(struct cmg_ext_entry); + area = css->ecub[id / CSS_ECUES_PER_PAGE]; + idx = id % CSS_ECUES_PER_PAGE; + } else { + size = sizeof(struct cmg_entry); + area = css->cub[id / CSS_CUES_PER_PAGE]; + idx = id % CSS_CUES_PER_PAGE; + } + entry = area + (idx * size); /* Only allow single reads. */ if (off || count < size) return 0; - chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); - count = size; - return count; + + memcpy(buf, entry, size); + + return size; } -static const struct bin_attribute chp_measurement_attr = { - .attr = { - .name = "measurement", - .mode = S_IRUSR, - }, - .size = sizeof(struct cmg_entry), - .read = chp_measurement_read, +static ssize_t measurement_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + return chp_measurement_copy_block(buf, off, count, kobj, false); +} +static BIN_ATTR_ADMIN_RO(measurement, sizeof(struct cmg_entry)); + +static ssize_t ext_measurement_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + return chp_measurement_copy_block(buf, off, count, kobj, true); +} +static BIN_ATTR_ADMIN_RO(ext_measurement, sizeof(struct cmg_ext_entry)); + +static struct bin_attribute *measurement_attrs[] = { + &bin_attr_measurement_chars, + &bin_attr_measurement, + &bin_attr_ext_measurement, + NULL, }; +BIN_ATTRIBUTE_GROUPS(measurement); void chp_remove_cmg_attr(struct channel_path *chp) { - device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); - device_remove_bin_file(&chp->dev, &chp_measurement_attr); + device_remove_groups(&chp->dev, measurement_groups); } int chp_add_cmg_attr(struct channel_path *chp) { - int ret; - - ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); - if (ret) - return ret; - ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); - if (ret) - device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); - return ret; + return device_add_groups(&chp->dev, measurement_groups); } /* @@ -401,6 +392,35 @@ static ssize_t chp_esc_show(struct device *dev, } static DEVICE_ATTR(esc, 0444, chp_esc_show, NULL); +static char apply_max_suffix(unsigned long *value, unsigned long base) +{ + static char suffixes[] = { 0, 'K', 'M', 'G', 'T' }; + int i; + + for (i = 0; i < ARRAY_SIZE(suffixes) - 1; i++) { + if (*value < base || *value % base != 0) + break; + *value /= base; + } + + return suffixes[i]; +} + +static ssize_t speed_bps_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + unsigned long speed = chp->speed; + char suffix; + + suffix = apply_max_suffix(&speed, 1000); + + return suffix ? sysfs_emit(buf, "%lu%c\n", speed, suffix) : + sysfs_emit(buf, "%lu\n", speed); +} + +static DEVICE_ATTR_RO(speed_bps); + static ssize_t util_string_read(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t off, size_t count) @@ -432,6 +452,7 @@ static struct attribute *chp_attrs[] = { &dev_attr_chid.attr, &dev_attr_chid_external.attr, &dev_attr_esc.attr, + &dev_attr_speed_bps.attr, NULL, }; static struct attribute_group chp_attr_group = { |