Hi Guenter,
On 03/09/2017 05:40 PM, Guenter Roeck wrote:
> On Thu, Mar 09, 2017 at 05:19:15PM +0530, Shilpasri G Bhat wrote:
>> Add support to read power and temperature sensors from OCC inband
>> sensors which are copied to main memory by OCC.
>>
>
> Is this supposed to be an alternative to the submission from
> Eddie James ? If so, is there a reason to consider such an
> alternative ?
>
This is not an alternative submission. Eddie James' hwmon OCC driver is to
export the sensors in BMC which is a service processor for POWER{8,9} servers.
This patch adds a hwmon driver in the POWER9 server.
Thanks and Regards,
Shilpa
> Thanks,
> Guenter
>
>> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@xxxxxxxxxxxxxxxxxx>
>> CC: Rob Herring <robh+dt@xxxxxxxxxx>
>> CC: Mark Rutland <mark.rutland@xxxxxxx>
>> CC: Jean Delvare <jdelvare@xxxxxxxx>
>> CC: Guenter Roeck <linux@xxxxxxxxxxxx>
>> CC: Jonathan Corbet <corbet@xxxxxxx>
>> CC: devicetree@xxxxxxxxxxxxxxx
>> CC: linux-hwmon@xxxxxxxxxxxxxxx
>> CC: linux-doc@xxxxxxxxxxxxxxx
>> ---
>> .../devicetree/bindings/hwmon/ibmpowernv-occ.txt | 4 +
>> Documentation/hwmon/ibmpowernv-occ | 24 ++
>> drivers/hwmon/Kconfig | 11 +
>> drivers/hwmon/Makefile | 1 +
>> drivers/hwmon/ibmpowernv-occ.c | 302 +++++++++++++++++++++
>> 5 files changed, 342 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/hwmon/ibmpowernv-occ.txt
>> create mode 100644 Documentation/hwmon/ibmpowernv-occ
>> create mode 100644 drivers/hwmon/ibmpowernv-occ.c
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/ibmpowernv-occ.txt b/Documentation/devicetree/bindings/hwmon/ibmpowernv-occ.txt
>> new file mode 100644
>> index 0000000..d03f744
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hwmon/ibmpowernv-occ.txt
>> @@ -0,0 +1,4 @@
>> +IBM POWERNV OCC inband platform sensors
>> +
>> +Required device-tree property:
>> +- compatible: "ibm,p9-occ-inband-sensor"
>> diff --git a/Documentation/hwmon/ibmpowernv-occ b/Documentation/hwmon/ibmpowernv-occ
>> new file mode 100644
>> index 0000000..151028b
>> --- /dev/null
>> +++ b/Documentation/hwmon/ibmpowernv-occ
>> @@ -0,0 +1,24 @@
>> +Kernel driver ibmpowernv-occ
>> +=============================
>> +
>> +Supported systems:
>> + * P9 server based on POWERNV platform
>> +
>> +Description
>> +------------
>> +
>> +This driver exports the power and temperature sensors from OCC inband
>> +sensors on P9 POWERNV platforms.
>> +
>> +Sysfs attributes
>> +----------------
>> +
>> +powerX_input Latest power reading
>> +powerX_input_highest Minimum power
>> +powerX_input_lowest Maximum power
>> +powerX_label Sensor name
>> +
>> +tempX_input Latest temperature reading
>> +tempX_max Minimum temperature
>> +tempX_min Maximum temperature
>> +tempX_label Sensor name
>> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
>> index 0649d53f3..3b1dbb9 100644
>> --- a/drivers/hwmon/Kconfig
>> +++ b/drivers/hwmon/Kconfig
>> @@ -598,6 +598,17 @@ config SENSORS_IBMPOWERNV
>> This driver can also be built as a module. If so, the module
>> will be called ibmpowernv.
>>
>> +config SENSORS_IBMPOWERNV_OCC
>> + tristate "IBM POWERNV OCC Inband platform sensors"
>> + depends on PPC_POWERNV
>> + default y
>> + help
>> + If you say yes here you get support for the temperature/power
>> + OCC inband sensors on your PowerNV platform.
>> +
>> + This driver can also be built as a module. If so, the module
>> + will be called ibmpowernv-occ.
>> +
>> config SENSORS_IIO_HWMON
>> tristate "Hwmon driver that uses channels specified via iio maps"
>> depends on IIO
>> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
>> index 5509edf..0da2207 100644
>> --- a/drivers/hwmon/Makefile
>> +++ b/drivers/hwmon/Makefile
>> @@ -75,6 +75,7 @@ obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
>> obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
>> obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
>> obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o
>> +obj-$(CONFIG_SENSORS_IBMPOWERNV_OCC)+= ibmpowernv-occ.o
>> obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o
>> obj-$(CONFIG_SENSORS_INA209) += ina209.o
>> obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o
>> diff --git a/drivers/hwmon/ibmpowernv-occ.c b/drivers/hwmon/ibmpowernv-occ.c
>> new file mode 100644
>> index 0000000..97b1bbe
>> --- /dev/null
>> +++ b/drivers/hwmon/ibmpowernv-occ.c
>> @@ -0,0 +1,302 @@
>> +/*
>> + * IBM PowerNV platform OCC inband sensors for temperature/power
>> + * Copyright (C) 2017 IBM
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program.
>> + */
>> +
>> +#define DRVNAME "ibmpowernv_occ"
>> +#define pr_fmt(fmt) DRVNAME ": " fmt
>> +
>> +#include <linux/module.h>
>> +#include <linux/hwmon.h>
>> +#include <linux/slab.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include <asm/opal.h>
>> +
>> +#define MAX_HWMON_ATTR_LEN 32
>> +#define MAX_HWMON_LABEL_LEN (MAX_OCC_SENSOR_NAME_LEN * 2)
>> +#define HWMON_ATTRS_PER_SENSOR 16
>> +#define TO_MILLI_UNITS(x) ((x) * 1000)
>> +#define TO_MICRO_UNITS(x) ((x) * 1000000)
>> +
>> +enum sensors {
>> + TEMP,
>> + POWER,
>> + MAX_SENSOR_TYPE,
>> +};
>> +
>> +static struct sensor_type {
>> + const char *name;
>> + int hwmon_id;
>> +} sensor_types[] = {
>> + { "temp"},
>> + { "power"},
>> +};
>> +
>> +static struct sensor_data {
>> + u32 occ_id;
>> + u64 offset; /* Offset to ping/pong reading buffer */
>> + enum sensors type;
>> + char label[MAX_HWMON_LABEL_LEN];
>> + char name[MAX_HWMON_ATTR_LEN];
>> + struct device_attribute attr;
>> +} *sdata;
>> +
>> +static struct attribute_group sensor_attrs_group;
>> +__ATTRIBUTE_GROUPS(sensor_attrs);
>> +
>> +#define show(file_name) \
>> +static ssize_t ibmpowernv_occ_show_##file_name \
>> +(struct device *dev, struct device_attribute *dattr, char *buf) \
>> +{ \
>> + struct sensor_data *sdata = container_of(dattr, \
>> + struct sensor_data, \
>> + attr); \
>> + u64 val; \
>> + int ret; \
>> + ret = opal_occ_sensor_get_##file_name(sdata->occ_id, \
>> + sdata->offset, \
>> + &val); \
>> + if (ret) \
>> + return ret; \
>> + if (sdata->type == TEMP) \
>> + val = TO_MILLI_UNITS(val); \
>> + else if (sdata->type == POWER) \
>> + val = TO_MICRO_UNITS(val); \
>> + return sprintf(buf, "%llu\n", val); \
>> +}
>> +
>> +show(sample);
>> +show(max);
>> +show(min);
>> +show(js_min);
>> +show(js_max);
>> +show(csm_min);
>> +show(csm_max);
>> +show(prof_min);
>> +show(prof_max);
>> +
>> +static struct sensor_view_groups {
>> + const char *name;
>> + ssize_t (*show_sample)(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf);
>> + ssize_t (*show_min)(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf);
>> + ssize_t (*show_max)(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf);
>> +} sensor_views[] = {
>> + {
>> + .name = "",
>> + .show_sample = ibmpowernv_occ_show_sample,
>> + .show_min = ibmpowernv_occ_show_min,
>> + .show_max = ibmpowernv_occ_show_max
>> + },
>> + {
>> + .name = "_JS",
>> + .show_sample = ibmpowernv_occ_show_sample,
>> + .show_min = ibmpowernv_occ_show_js_min,
>> + .show_max = ibmpowernv_occ_show_js_max
>> + },
>> + { .name = "_CSM",
>> + .show_sample = ibmpowernv_occ_show_sample,
>> + .show_min = ibmpowernv_occ_show_csm_min,
>> + .show_max = ibmpowernv_occ_show_csm_max
>> + },
>> + { .name = "_Prof",
>> + .show_sample = ibmpowernv_occ_show_sample,
>> + .show_min = ibmpowernv_occ_show_prof_min,
>> + .show_max = ibmpowernv_occ_show_prof_max
>> + },
>> +};
>> +
>> +static ssize_t ibmpowernv_occ_show_label(struct device *dev,
>> + struct device_attribute *dattr,
>> + char *buf)
>> +{
>> + struct sensor_data *sdata = container_of(dattr, struct sensor_data,
>> + attr);
>> +
>> + return sprintf(buf, "%s\n", sdata->label);
>> +}
>> +
>> +static int ibmpowernv_occ_get_sensor_type(enum occ_sensor_type type)
>> +{
>> + switch (type) {
>> + case OCC_SENSOR_TYPE_POWER:
>> + return POWER;
>> + case OCC_SENSOR_TYPE_TEMPERATURE:
>> + return TEMP;
>> + default:
>> + return MAX_SENSOR_TYPE;
>> + }
>> +
>> + return MAX_SENSOR_TYPE;
>> +}
>> +
>> +static void ibmpowernv_occ_add_sdata(struct occ_hwmon_sensor sensor,
>> + struct sensor_data *sdata, char *name,
>> + int hwmon_id, enum sensors type,
>> + ssize_t (*show)(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf))
>> +{
>> + sdata->type = type;
>> + sdata->occ_id = sensor.occ_id;
>> + sdata->offset = sensor.offset;
>> + snprintf(sdata->name, MAX_HWMON_ATTR_LEN, "%s%d_%s",
>> + sensor_types[type].name, hwmon_id, name);
>> + sysfs_attr_init(&sdata->attr.attr);
>> + sdata->attr.attr.name = sdata->name;
>> + sdata->attr.attr.mode = 0444;
>> + sdata->attr.show = show;
>> +}
>> +
>> +static void ibmpowernv_occ_add_sensor_attrs(struct occ_hwmon_sensor sensor,
>> + int index)
>> +{
>> + struct attribute **attrs = sensor_attrs_group.attrs;
>> + char attr_str[MAX_HWMON_ATTR_LEN];
>> + enum sensors type = ibmpowernv_occ_get_sensor_type(sensor.type);
>> + int i;
>> +
>> + index *= HWMON_ATTRS_PER_SENSOR;
>> + for (i = 0; i < ARRAY_SIZE(sensor_views); i++) {
>> + int hid = ++sensor_types[type].hwmon_id;
>> +
>> + /* input */
>> + ibmpowernv_occ_add_sdata(sensor, &sdata[index], "input", hid,
>> + type, sensor_views[i].show_sample);
>> + attrs[index] = &sdata[index].attr.attr;
>> + index++;
>> +
>> + /* min */
>> + if (type == POWER)
>> + snprintf(attr_str, MAX_HWMON_ATTR_LEN, "%s",
>> + "input_lowest");
>> + else
>> + snprintf(attr_str, MAX_HWMON_ATTR_LEN, "%s", "min");
>> +
>> + ibmpowernv_occ_add_sdata(sensor, &sdata[index], attr_str, hid,
>> + type, sensor_views[i].show_min);
>> + attrs[index] = &sdata[index].attr.attr;
>> + index++;
>> +
>> + /* max */
>> + if (type == POWER)
>> + snprintf(attr_str, MAX_HWMON_ATTR_LEN, "%s",
>> + "input_highest");
>> + else
>> + snprintf(attr_str, MAX_HWMON_ATTR_LEN, "%s", "max");
>> +
>> + ibmpowernv_occ_add_sdata(sensor, &sdata[index], attr_str, hid,
>> + type, sensor_views[i].show_max);
>> + attrs[index] = &sdata[index].attr.attr;
>> + index++;
>> +
>> + /* label */
>> + snprintf(sdata[index].label, MAX_HWMON_LABEL_LEN, "%s%s",
>> + sensor.name, sensor_views[i].name);
>> + ibmpowernv_occ_add_sdata(sensor, &sdata[index], "label", hid,
>> + type, ibmpowernv_occ_show_label);
>> + attrs[index] = &sdata[index].attr.attr;
>> + index++;
>> + }
>> +}
>> +
>> +static int ibmpowernv_occ_add_device_attrs(struct platform_device *pdev)
>> +{
>> + struct attribute **attrs;
>> + struct occ_hwmon_sensor *slist = NULL;
>> + int nr_sensors = 0, i;
>> + int ret = -ENOMEM;
>> +
>> + slist = opal_occ_sensor_get_hwmon_list(&nr_sensors);
>> + if (!nr_sensors)
>> + return -ENODEV;
>> +
>> + if (!slist)
>> + return ret;
>> +
>> + sdata = devm_kzalloc(&pdev->dev, nr_sensors * sizeof(*sdata) *
>> + HWMON_ATTRS_PER_SENSOR, GFP_KERNEL);
>> + if (!sdata)
>> + goto out;
>> +
>> + attrs = devm_kzalloc(&pdev->dev, nr_sensors * sizeof(*attrs) *
>> + HWMON_ATTRS_PER_SENSOR, GFP_KERNEL);
>> + if (!attrs)
>> + goto out;
>> +
>> + sensor_attrs_group.attrs = attrs;
>> + for (i = 0; i < nr_sensors; i++)
>> + ibmpowernv_occ_add_sensor_attrs(slist[i], i);
>> +
>> + ret = 0;
>> +out:
>> + kfree(slist);
>> + return ret;
>> +}
>> +
>> +static int ibmpowernv_occ_probe(struct platform_device *pdev)
>> +{
>> + struct device *hwmon_dev;
>> + int err;
>> +
>> + err = ibmpowernv_occ_add_device_attrs(pdev);
>> + if (err)
>> + goto out;
>> +
>> + hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
>> + NULL,
>> + sensor_attrs_groups);
>> +
>> + err = PTR_ERR_OR_ZERO(hwmon_dev);
>> +out:
>> + if (err)
>> + pr_warn("Failed to initialize Hwmon OCC inband sensors\n");
>> +
>> + return err;
>> +}
>> +
>> +static const struct platform_device_id occ_sensor_ids[] = {
>> + { .name = "occ-inband-sensor" },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(platform, occ_sensor_ids);
>> +
>> +static const struct of_device_id occ_sensor_of_ids[] = {
>> + { .compatible = "ibm,p9-occ-inband-sensor" },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, occ_sensor_of_ids);
>> +
>> +static struct platform_driver ibmpowernv_occ_driver = {
>> + .probe = ibmpowernv_occ_probe,
>> + .id_table = occ_sensor_ids,
>> + .driver = {
>> + .name = DRVNAME,
>> + .of_match_table = occ_sensor_of_ids,
>> + },
>> +};
>> +
>> +module_platform_driver(ibmpowernv_occ_driver);
>> +
>> +MODULE_AUTHOR("Shilpasri G Bhat <shilpa.bhat@xxxxxxxxxxxxxxxxxx>");
>> +MODULE_DESCRIPTION("IBM POWERNV platform OCC inband sensors");
>> +MODULE_LICENSE("GPL");
>> --
>> 1.8.3.1
>>
>
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