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@xxxxxxxxxx>
---
Changes since v1:
- check cpu validity before printing out the attribute label.
if invalid, use a "phy" prefix to distinguish a linux cpu
number from a physical cpu number.
drivers/hwmon/ibmpowernv.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
Index: linux.git/drivers/hwmon/ibmpowernv.c
===================================================================
--- linux.git.orig/drivers/hwmon/ibmpowernv.c
+++ linux.git/drivers/hwmon/ibmpowernv.c
@@ -113,9 +113,43 @@ static ssize_t show_label(struct device
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 i = -1;
+
+ for_each_possible_cpu(i)
+ if (paca[i].hw_cpu_id == id)
+ break;
+
+ if (i != -1)
+ /*
+ * 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", i, i+7);
+ 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,
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