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| author | Peter Oberparleiter <oberpar@linux.ibm.com> | 2024-03-26 17:03:24 +0100 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2024-04-12 16:11:29 +0200 |
| commit | 0f987e6caa3c93f36e277624234880459848fa34 (patch) | |
| tree | 5744235695ca07609ed9848b9af1cf1e0c902472 /drivers/s390/cio/chp.c | |
| parent | 5e6bb10ee523d85d688aacaa13405d651ad16214 (diff) | |
| download | linux-stable-0f987e6caa3c93f36e277624234880459848fa34.tar.gz linux-stable-0f987e6caa3c93f36e277624234880459848fa34.tar.bz2 linux-stable-0f987e6caa3c93f36e277624234880459848fa34.zip | |
s390/cio: export CHPID operating speed
Add a per-CHPID sysfs attribute named "speed_bps" that provides the
operating speed of the associated channel path in bits per second,
or 0 if the operating speed is not available.
Example:
$ cat /sys/devices/css0/chp0.32/speed_bps
32G
Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'drivers/s390/cio/chp.c')
| -rw-r--r-- | drivers/s390/cio/chp.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c index fd7d34ed6ea9..a07bbecba61c 100644 --- a/drivers/s390/cio/chp.c +++ b/drivers/s390/cio/chp.c @@ -392,6 +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) @@ -423,6 +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 = { |