From 0f987e6caa3c93f36e277624234880459848fa34 Mon Sep 17 00:00:00 2001 From: Peter Oberparleiter Date: Tue, 26 Mar 2024 17:03:24 +0100 Subject: 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 Acked-by: Heiko Carstens Signed-off-by: Peter Oberparleiter Signed-off-by: Alexander Gordeev --- drivers/s390/cio/chp.c | 30 ++++++++++++++++++++++++++++++ drivers/s390/cio/chp.h | 1 + drivers/s390/cio/chsc.c | 20 ++++++++++++++++++-- 3 files changed, 49 insertions(+), 2 deletions(-) (limited to 'drivers/s390') 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 = { diff --git a/drivers/s390/cio/chp.h b/drivers/s390/cio/chp.h index 1241033ccd62..a15324a43aa3 100644 --- a/drivers/s390/cio/chp.h +++ b/drivers/s390/cio/chp.h @@ -52,6 +52,7 @@ struct channel_path { int cmg; int shared; int extended; + unsigned long speed; struct cmg_chars cmg_chars; }; diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index bfc663889fbd..dcc1e1c34ca2 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -1066,6 +1066,18 @@ chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, } } +static unsigned long scmc_get_speed(u32 s, u32 p) +{ + unsigned long speed = s; + + if (!p) + p = 8; + while (p--) + speed *= 10; + + return speed; +} + int chsc_get_channel_measurement_chars(struct channel_path *chp) { unsigned long flags; @@ -1086,16 +1098,19 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp) u32 : 21; u32 chpid : 8; u32 cmcv : 5; - u32 : 11; + u32 : 7; + u32 cmgp : 4; u32 cmgq : 8; u32 cmg : 8; - u32 zeroes3; + u32 : 16; + u32 cmgs : 16; u32 data[NR_MEASUREMENT_CHARS]; } *scmc_area; chp->shared = -1; chp->cmg = -1; chp->extended = 0; + chp->speed = 0; if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm) return -EINVAL; @@ -1126,6 +1141,7 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp) chp->cmg = scmc_area->cmg; chp->shared = scmc_area->shared; chp->extended = scmc_area->extended; + chp->speed = scmc_get_speed(scmc_area->cmgs, scmc_area->cmgp); chsc_initialize_cmg_chars(chp, scmc_area->cmcv, (struct cmg_chars *) &scmc_area->data); out: -- cgit v1.2.3