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Commit 3df2f59f authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Guenter Roeck
Browse files

hwmon: (ibmpowernv) pretty print labels 



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: default avatarCédric Le Goater <clg@fr.ibm.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 2bcd3787

drivers/hwmon/ibmpowernv.c

+41 −0
Original line number Diff line number Diff line
@@ -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)