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authorCédric Le Goater <clg@fr.ibm.com>2015-04-08 19:19:50 +0200
committerGuenter Roeck <linux@roeck-us.net>2015-04-08 10:34:20 -0700
commit3df2f59f0aae2f5380a9d8037c91dcab75c4478d (patch)
tree8e49b6332b95a8fa5847185ff39e855fc2b25382
parent2bcd3787b946b725a37763c0877da0996f5ec064 (diff)
downloadop-kernel-dev-3df2f59f0aae2f5380a9d8037c91dcab75c4478d.zip
op-kernel-dev-3df2f59f0aae2f5380a9d8037c91dcab75c4478d.tar.gz
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: Cédric Le Goater <clg@fr.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
-rw-r--r--drivers/hwmon/ibmpowernv.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
index 1180ce6..7108daf 100644
--- a/drivers/hwmon/ibmpowernv.c
+++ b/drivers/hwmon/ibmpowernv.c
@@ -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)
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