@@ -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,
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> --- Changes since v4: - fixed comparison between signed and unsigned integer in get_logical_cpu() Changes since v3: - removed error message in case of an unknown physical cpu number Changes since v2: - fix bogus logical cpu retrieval - use 'threads_per_core' to print out cpu range 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 | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)