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hwmon: (ibmpowernv) pretty print labels

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The new OPAL device tree adds a few properties which can be used to add
extra information on the sensor label.

In the case of a cpu core sensor, the firmware exposes the physical
identifier of the core in the "ibm,pir" property. The driver
translates this identifier in a linux cpu number and prints out a
range corresponding to the hardware threads of the core (as they
share the same sensor).

The numbering gives a hint on the localization of the core in the
system (which socket, which chip).

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Cédric Le Goater 2015-04-08 19:19:50 +02:00 committed by Guenter Roeck
parent 2bcd3787b9
commit 3df2f59f0a
1 changed files with 41 additions and 0 deletions
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41
drivers/hwmon/ibmpowernv.c
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@ -30,6 +30,7 @@
#include <linux/platform_device.h>
#include <asm/opal.h>
#include <linux/err.h>
#include <asm/cputhreads.h>
#define MAX_ATTR_LEN 32
#define MAX_LABEL_LEN 64
@ -112,13 +113,53 @@ static ssize_t show_label(struct device *dev, struct device_attribute *devattr,
return sprintf(buf, "%s\n", sdata->label);
}
static int __init get_logical_cpu(int hwcpu)
{
int cpu;
for_each_possible_cpu(cpu)
if (get_hard_smp_processor_id(cpu) == hwcpu)
return cpu;
return -ENOENT;
}
static void __init make_sensor_label(struct device_node *np,
struct sensor_data *sdata,
const char *label)
{
u32 id;
size_t n;
n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);
/*
* Core temp pretty print
*/
if (!of_property_read_u32(np, "ibm,pir", &id)) {
int cpuid = get_logical_cpu(id);
if (cpuid >= 0)
/*
* The digital thermal sensors are associated
* with a core. Let's print out the range of
* cpu ids corresponding to the hardware
* threads of the core.
*/
n += snprintf(sdata->label + n,
sizeof(sdata->label) - n, " %d-%d",
cpuid, cpuid + threads_per_core - 1);
else
n += snprintf(sdata->label + n,
sizeof(sdata->label) - n, " phy%d", id);
}
/*
* Membuffer pretty print
*/
if (!of_property_read_u32(np, "ibm,chip-id", &id))
n += snprintf(sdata->label + n, sizeof(sdata->label) - n,
" %d", id & 0xffff);
}
static int get_sensor_index_attr(const char *name, u32 *index, char *attr)