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hwmon (occ): Add sensor types and versions

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Add structures to define all sensor types and versions. Add sysfs show
and store functions for each sensor type. Add a method to construct the
"set user power cap" command and send it to the OCC. Add rate limit to
polling the OCC (in case user-space reads our hwmon entries rapidly).

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Eddie James 2018-11-08 15:05:27 -06:00 committed by Guenter Roeck
parent aa195fe49b
commit c10e753d43
4 changed files with 629 additions and 0 deletions
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621
drivers/hwmon/occ/common.c
View File

@ -1,10 +1,116 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/device.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/mutex.h>
#include <asm/unaligned.h>
#include "common.h"
#define EXTN_FLAG_SENSOR_ID BIT(7)
#define OCC_UPDATE_FREQUENCY msecs_to_jiffies(1000)
#define OCC_TEMP_SENSOR_FAULT 0xFF
#define OCC_FRU_TYPE_VRM 3
/* OCC sensor type and version definitions */
struct temp_sensor_1 {
u16 sensor_id;
u16 value;
} __packed;
struct temp_sensor_2 {
u32 sensor_id;
u8 fru_type;
u8 value;
} __packed;
struct freq_sensor_1 {
u16 sensor_id;
u16 value;
} __packed;
struct freq_sensor_2 {
u32 sensor_id;
u16 value;
} __packed;
struct power_sensor_1 {
u16 sensor_id;
u32 update_tag;
u32 accumulator;
u16 value;
} __packed;
struct power_sensor_2 {
u32 sensor_id;
u8 function_id;
u8 apss_channel;
u16 reserved;
u32 update_tag;
u64 accumulator;
u16 value;
} __packed;
struct power_sensor_data {
u16 value;
u32 update_tag;
u64 accumulator;
} __packed;
struct power_sensor_data_and_time {
u16 update_time;
u16 value;
u32 update_tag;
u64 accumulator;
} __packed;
struct power_sensor_a0 {
u32 sensor_id;
struct power_sensor_data_and_time system;
u32 reserved;
struct power_sensor_data_and_time proc;
struct power_sensor_data vdd;
struct power_sensor_data vdn;
} __packed;
struct caps_sensor_2 {
u16 cap;
u16 system_power;
u16 n_cap;
u16 max;
u16 min;
u16 user;
u8 user_source;
} __packed;
struct caps_sensor_3 {
u16 cap;
u16 system_power;
u16 n_cap;
u16 max;
u16 hard_min;
u16 soft_min;
u16 user;
u8 user_source;
} __packed;
struct extended_sensor {
union {
u8 name[4];
u32 sensor_id;
};
u8 flags;
u8 reserved;
u8 data[6];
} __packed;
static int occ_poll(struct occ *occ)
{
u16 checksum = occ->poll_cmd_data + 1;
@ -20,9 +126,521 @@ static int occ_poll(struct occ *occ)
cmd[6] = checksum & 0xFF; /* checksum lsb */
cmd[7] = 0;
/* mutex should already be locked if necessary */
return occ->send_cmd(occ, cmd);
}
static int occ_set_user_power_cap(struct occ *occ, u16 user_power_cap)
{
int rc;
u8 cmd[8];
u16 checksum = 0x24;
__be16 user_power_cap_be = cpu_to_be16(user_power_cap);
cmd[0] = 0;
cmd[1] = 0x22;
cmd[2] = 0;
cmd[3] = 2;
memcpy(&cmd[4], &user_power_cap_be, 2);
checksum += cmd[4] + cmd[5];
cmd[6] = checksum >> 8;
cmd[7] = checksum & 0xFF;
rc = mutex_lock_interruptible(&occ->lock);
if (rc)
return rc;
rc = occ->send_cmd(occ, cmd);
mutex_unlock(&occ->lock);
return rc;
}
static int occ_update_response(struct occ *occ)
{
int rc = mutex_lock_interruptible(&occ->lock);
if (rc)
return rc;
/* limit the maximum rate of polling the OCC */
if (time_after(jiffies, occ->last_update + OCC_UPDATE_FREQUENCY)) {
rc = occ_poll(occ);
occ->last_update = jiffies;
}
mutex_unlock(&occ->lock);
return rc;
}
static ssize_t occ_show_temp_1(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u32 val = 0;
struct temp_sensor_1 *temp;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
temp = ((struct temp_sensor_1 *)sensors->temp.data) + sattr->index;
switch (sattr->nr) {
case 0:
val = get_unaligned_be16(&temp->sensor_id);
break;
case 1:
val = get_unaligned_be16(&temp->value) * 1000;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
}
static ssize_t occ_show_temp_2(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u32 val = 0;
struct temp_sensor_2 *temp;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
temp = ((struct temp_sensor_2 *)sensors->temp.data) + sattr->index;
switch (sattr->nr) {
case 0:
val = get_unaligned_be32(&temp->sensor_id);
break;
case 1:
val = temp->value;
if (val == OCC_TEMP_SENSOR_FAULT)
return -EREMOTEIO;
/*
* VRM doesn't return temperature, only alarm bit. This
* attribute maps to tempX_alarm instead of tempX_input for
* VRM
*/
if (temp->fru_type != OCC_FRU_TYPE_VRM) {
/* sensor not ready */
if (val == 0)
return -EAGAIN;
val *= 1000;
}
break;
case 2:
val = temp->fru_type;
break;
case 3:
val = temp->value == OCC_TEMP_SENSOR_FAULT;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
}
static ssize_t occ_show_freq_1(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u16 val = 0;
struct freq_sensor_1 *freq;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
freq = ((struct freq_sensor_1 *)sensors->freq.data) + sattr->index;
switch (sattr->nr) {
case 0:
val = get_unaligned_be16(&freq->sensor_id);
break;
case 1:
val = get_unaligned_be16(&freq->value);
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
}
static ssize_t occ_show_freq_2(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u32 val = 0;
struct freq_sensor_2 *freq;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
freq = ((struct freq_sensor_2 *)sensors->freq.data) + sattr->index;
switch (sattr->nr) {
case 0:
val = get_unaligned_be32(&freq->sensor_id);
break;
case 1:
val = get_unaligned_be16(&freq->value);
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
}
static ssize_t occ_show_power_1(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u64 val = 0;
struct power_sensor_1 *power;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
power = ((struct power_sensor_1 *)sensors->power.data) + sattr->index;
switch (sattr->nr) {
case 0:
val = get_unaligned_be16(&power->sensor_id);
break;
case 1:
val = get_unaligned_be32(&power->accumulator) /
get_unaligned_be32(&power->update_tag);
val *= 1000000ULL;
break;
case 2:
val = get_unaligned_be32(&power->update_tag) *
occ->powr_sample_time_us;
break;
case 3:
val = get_unaligned_be16(&power->value) * 1000000ULL;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
}
static u64 occ_get_powr_avg(u64 *accum, u32 *samples)
{
return div64_u64(get_unaligned_be64(accum) * 1000000ULL,
get_unaligned_be32(samples));
}
static ssize_t occ_show_power_2(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u64 val = 0;
struct power_sensor_2 *power;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
power = ((struct power_sensor_2 *)sensors->power.data) + sattr->index;
switch (sattr->nr) {
case 0:
return snprintf(buf, PAGE_SIZE - 1, "%u_%u_%u\n",
get_unaligned_be32(&power->sensor_id),
power->function_id, power->apss_channel);
case 1:
val = occ_get_powr_avg(&power->accumulator,
&power->update_tag);
break;
case 2:
val = get_unaligned_be32(&power->update_tag) *
occ->powr_sample_time_us;
break;
case 3:
val = get_unaligned_be16(&power->value) * 1000000ULL;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
}
static ssize_t occ_show_power_a0(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u64 val = 0;
struct power_sensor_a0 *power;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
power = ((struct power_sensor_a0 *)sensors->power.data) + sattr->index;
switch (sattr->nr) {
case 0:
return snprintf(buf, PAGE_SIZE - 1, "%u_system\n",
get_unaligned_be32(&power->sensor_id));
case 1:
val = occ_get_powr_avg(&power->system.accumulator,
&power->system.update_tag);
break;
case 2:
val = get_unaligned_be32(&power->system.update_tag) *
occ->powr_sample_time_us;
break;
case 3:
val = get_unaligned_be16(&power->system.value) * 1000000ULL;
break;
case 4:
return snprintf(buf, PAGE_SIZE - 1, "%u_proc\n",
get_unaligned_be32(&power->sensor_id));
case 5:
val = occ_get_powr_avg(&power->proc.accumulator,
&power->proc.update_tag);
break;
case 6:
val = get_unaligned_be32(&power->proc.update_tag) *
occ->powr_sample_time_us;
break;
case 7:
val = get_unaligned_be16(&power->proc.value) * 1000000ULL;
break;
case 8:
return snprintf(buf, PAGE_SIZE - 1, "%u_vdd\n",
get_unaligned_be32(&power->sensor_id));
case 9:
val = occ_get_powr_avg(&power->vdd.accumulator,
&power->vdd.update_tag);
break;
case 10:
val = get_unaligned_be32(&power->vdd.update_tag) *
occ->powr_sample_time_us;
break;
case 11:
val = get_unaligned_be16(&power->vdd.value) * 1000000ULL;
break;
case 12:
return snprintf(buf, PAGE_SIZE - 1, "%u_vdn\n",
get_unaligned_be32(&power->sensor_id));
case 13:
val = occ_get_powr_avg(&power->vdn.accumulator,
&power->vdn.update_tag);
break;
case 14:
val = get_unaligned_be32(&power->vdn.update_tag) *
occ->powr_sample_time_us;
break;
case 15:
val = get_unaligned_be16(&power->vdn.value) * 1000000ULL;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
}
static ssize_t occ_show_caps_1_2(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u64 val = 0;
struct caps_sensor_2 *caps;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
caps = ((struct caps_sensor_2 *)sensors->caps.data) + sattr->index;
switch (sattr->nr) {
case 0:
return snprintf(buf, PAGE_SIZE - 1, "system\n");
case 1:
val = get_unaligned_be16(&caps->cap) * 1000000ULL;
break;
case 2:
val = get_unaligned_be16(&caps->system_power) * 1000000ULL;
break;
case 3:
val = get_unaligned_be16(&caps->n_cap) * 1000000ULL;
break;
case 4:
val = get_unaligned_be16(&caps->max) * 1000000ULL;
break;
case 5:
val = get_unaligned_be16(&caps->min) * 1000000ULL;
break;
case 6:
val = get_unaligned_be16(&caps->user) * 1000000ULL;
break;
case 7:
if (occ->sensors.caps.version == 1)
return -EINVAL;
val = caps->user_source;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
}
static ssize_t occ_show_caps_3(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
u64 val = 0;
struct caps_sensor_3 *caps;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
caps = ((struct caps_sensor_3 *)sensors->caps.data) + sattr->index;
switch (sattr->nr) {
case 0:
return snprintf(buf, PAGE_SIZE - 1, "system\n");
case 1:
val = get_unaligned_be16(&caps->cap) * 1000000ULL;
break;
case 2:
val = get_unaligned_be16(&caps->system_power) * 1000000ULL;
break;
case 3:
val = get_unaligned_be16(&caps->n_cap) * 1000000ULL;
break;
case 4:
val = get_unaligned_be16(&caps->max) * 1000000ULL;
break;
case 5:
val = get_unaligned_be16(&caps->hard_min) * 1000000ULL;
break;
case 6:
val = get_unaligned_be16(&caps->user) * 1000000ULL;
break;
case 7:
val = caps->user_source;
break;
default:
return -EINVAL;
}
return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
}
static ssize_t occ_store_caps_user(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int rc;
u16 user_power_cap;
unsigned long long value;
struct occ *occ = dev_get_drvdata(dev);
rc = kstrtoull(buf, 0, &value);
if (rc)
return rc;
user_power_cap = div64_u64(value, 1000000ULL); /* microwatt to watt */
rc = occ_set_user_power_cap(occ, user_power_cap);
if (rc)
return rc;
return count;
}
static ssize_t occ_show_extended(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
struct extended_sensor *extn;
struct occ *occ = dev_get_drvdata(dev);
struct occ_sensors *sensors = &occ->sensors;
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
rc = occ_update_response(occ);
if (rc)
return rc;
extn = ((struct extended_sensor *)sensors->extended.data) +
sattr->index;
switch (sattr->nr) {
case 0:
if (extn->flags & EXTN_FLAG_SENSOR_ID)
rc = snprintf(buf, PAGE_SIZE - 1, "%u",
get_unaligned_be32(&extn->sensor_id));
else
rc = snprintf(buf, PAGE_SIZE - 1, "%02x%02x%02x%02x\n",
extn->name[0], extn->name[1],
extn->name[2], extn->name[3]);
break;
case 1:
rc = snprintf(buf, PAGE_SIZE - 1, "%02x\n", extn->flags);
break;
case 2:
rc = snprintf(buf, PAGE_SIZE - 1, "%02x%02x%02x%02x%02x%02x\n",
extn->data[0], extn->data[1], extn->data[2],
extn->data[3], extn->data[4], extn->data[5]);
break;
default:
return -EINVAL;
}
return rc;
}
/* only need to do this once at startup, as OCC won't change sensors on us */
static void occ_parse_poll_response(struct occ *occ)
{
@ -85,6 +703,9 @@ int occ_setup(struct occ *occ, const char *name)
{
int rc;
mutex_init(&occ->lock);
/* no need to lock */
rc = occ_poll(occ);
if (rc == -ESHUTDOWN) {
dev_info(occ->bus_dev, "host is not ready\n");

6
drivers/hwmon/occ/common.h
View File

@ -3,6 +3,8 @@
#ifndef OCC_COMMON_H
#define OCC_COMMON_H
#include <linux/mutex.h>
struct device;
#define OCC_RESP_DATA_BYTES 4089
@ -80,8 +82,12 @@ struct occ {
struct occ_response resp;
struct occ_sensors sensors;
int powr_sample_time_us; /* average power sample time */
u8 poll_cmd_data; /* to perform OCC poll command */
int (*send_cmd)(struct occ *occ, u8 *cmd);
unsigned long last_update;
struct mutex lock; /* lock OCC access */
};
int occ_setup(struct occ *occ, const char *name);

1
drivers/hwmon/occ/p8_i2c.c
View File

@ -216,6 +216,7 @@ static int p8_i2c_occ_probe(struct i2c_client *client,
occ->bus_dev = &client->dev;
dev_set_drvdata(&client->dev, occ);
occ->powr_sample_time_us = 250;
occ->poll_cmd_data = 0x10; /* P8 OCC poll data */
occ->send_cmd = p8_i2c_occ_send_cmd;

1
drivers/hwmon/occ/p9_sbe.c
View File

@ -69,6 +69,7 @@ static int p9_sbe_occ_probe(struct platform_device *pdev)
occ->bus_dev = &pdev->dev;
platform_set_drvdata(pdev, occ);
occ->powr_sample_time_us = 500;
occ->poll_cmd_data = 0x20; /* P9 OCC poll data */
occ->send_cmd = p9_sbe_occ_send_cmd;