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bd375feeaf
On Kingston KC3000 and Kingston FURY Renegade (both have the same PCI
IDs) accessing temp3_{min,max} fails with an invalid field error (note
that there is no problem setting the thresholds for temp1).
This contradicts the NVM Express Base Specification 2.0b, page 292:
The over temperature threshold and under temperature threshold
features shall be implemented for all implemented temperature sensors
(i.e., all Temperature Sensor fields that report a non-zero value).
Define NVME_QUIRK_NO_SECONDARY_TEMP_THRESH that disables the thresholds
for all but the composite temperature and set it for this device.
Signed-off-by: Hristo Venev <hristo@venev.name>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christoph Hellwig <hch@lst.de>
282 lines
6.3 KiB
C
282 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* NVM Express hardware monitoring support
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* Copyright (c) 2019, Guenter Roeck
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*/
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#include <linux/hwmon.h>
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#include <linux/units.h>
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#include <asm/unaligned.h>
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#include "nvme.h"
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struct nvme_hwmon_data {
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struct nvme_ctrl *ctrl;
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struct nvme_smart_log *log;
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struct mutex read_lock;
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};
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static int nvme_get_temp_thresh(struct nvme_ctrl *ctrl, int sensor, bool under,
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long *temp)
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{
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unsigned int threshold = sensor << NVME_TEMP_THRESH_SELECT_SHIFT;
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u32 status;
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int ret;
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if (under)
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threshold |= NVME_TEMP_THRESH_TYPE_UNDER;
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ret = nvme_get_features(ctrl, NVME_FEAT_TEMP_THRESH, threshold, NULL, 0,
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&status);
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if (ret > 0)
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return -EIO;
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if (ret < 0)
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return ret;
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*temp = kelvin_to_millicelsius(status & NVME_TEMP_THRESH_MASK);
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return 0;
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}
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static int nvme_set_temp_thresh(struct nvme_ctrl *ctrl, int sensor, bool under,
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long temp)
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{
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unsigned int threshold = sensor << NVME_TEMP_THRESH_SELECT_SHIFT;
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int ret;
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temp = millicelsius_to_kelvin(temp);
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threshold |= clamp_val(temp, 0, NVME_TEMP_THRESH_MASK);
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if (under)
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threshold |= NVME_TEMP_THRESH_TYPE_UNDER;
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ret = nvme_set_features(ctrl, NVME_FEAT_TEMP_THRESH, threshold, NULL, 0,
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NULL);
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if (ret > 0)
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return -EIO;
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return ret;
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}
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static int nvme_hwmon_get_smart_log(struct nvme_hwmon_data *data)
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{
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return nvme_get_log(data->ctrl, NVME_NSID_ALL, NVME_LOG_SMART, 0,
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NVME_CSI_NVM, data->log, sizeof(*data->log), 0);
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}
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static int nvme_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct nvme_hwmon_data *data = dev_get_drvdata(dev);
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struct nvme_smart_log *log = data->log;
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int temp;
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int err;
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/*
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* First handle attributes which don't require us to read
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* the smart log.
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*/
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switch (attr) {
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case hwmon_temp_max:
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return nvme_get_temp_thresh(data->ctrl, channel, false, val);
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case hwmon_temp_min:
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return nvme_get_temp_thresh(data->ctrl, channel, true, val);
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case hwmon_temp_crit:
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*val = kelvin_to_millicelsius(data->ctrl->cctemp);
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return 0;
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default:
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break;
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}
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mutex_lock(&data->read_lock);
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err = nvme_hwmon_get_smart_log(data);
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if (err)
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goto unlock;
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switch (attr) {
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case hwmon_temp_input:
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if (!channel)
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temp = get_unaligned_le16(log->temperature);
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else
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temp = le16_to_cpu(log->temp_sensor[channel - 1]);
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*val = kelvin_to_millicelsius(temp);
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break;
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case hwmon_temp_alarm:
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*val = !!(log->critical_warning & NVME_SMART_CRIT_TEMPERATURE);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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unlock:
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mutex_unlock(&data->read_lock);
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return err;
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}
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static int nvme_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct nvme_hwmon_data *data = dev_get_drvdata(dev);
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switch (attr) {
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case hwmon_temp_max:
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return nvme_set_temp_thresh(data->ctrl, channel, false, val);
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case hwmon_temp_min:
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return nvme_set_temp_thresh(data->ctrl, channel, true, val);
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default:
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break;
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}
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return -EOPNOTSUPP;
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}
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static const char * const nvme_hwmon_sensor_names[] = {
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"Composite",
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"Sensor 1",
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"Sensor 2",
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"Sensor 3",
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"Sensor 4",
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"Sensor 5",
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"Sensor 6",
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"Sensor 7",
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"Sensor 8",
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};
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static int nvme_hwmon_read_string(struct device *dev,
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enum hwmon_sensor_types type, u32 attr,
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int channel, const char **str)
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{
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*str = nvme_hwmon_sensor_names[channel];
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return 0;
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}
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static umode_t nvme_hwmon_is_visible(const void *_data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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const struct nvme_hwmon_data *data = _data;
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switch (attr) {
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case hwmon_temp_crit:
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if (!channel && data->ctrl->cctemp)
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return 0444;
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break;
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case hwmon_temp_max:
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case hwmon_temp_min:
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if ((!channel && data->ctrl->wctemp) ||
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(channel && data->log->temp_sensor[channel - 1] &&
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!(data->ctrl->quirks &
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NVME_QUIRK_NO_SECONDARY_TEMP_THRESH))) {
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if (data->ctrl->quirks &
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NVME_QUIRK_NO_TEMP_THRESH_CHANGE)
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return 0444;
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return 0644;
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}
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break;
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case hwmon_temp_alarm:
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if (!channel)
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return 0444;
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break;
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case hwmon_temp_input:
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case hwmon_temp_label:
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if (!channel || data->log->temp_sensor[channel - 1])
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return 0444;
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break;
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default:
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break;
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}
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return 0;
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}
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static const struct hwmon_channel_info *nvme_hwmon_info[] = {
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HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_CRIT | HWMON_T_LABEL | HWMON_T_ALARM,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
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HWMON_T_LABEL),
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NULL
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};
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static const struct hwmon_ops nvme_hwmon_ops = {
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.is_visible = nvme_hwmon_is_visible,
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.read = nvme_hwmon_read,
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.read_string = nvme_hwmon_read_string,
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.write = nvme_hwmon_write,
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};
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static const struct hwmon_chip_info nvme_hwmon_chip_info = {
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.ops = &nvme_hwmon_ops,
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.info = nvme_hwmon_info,
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};
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int nvme_hwmon_init(struct nvme_ctrl *ctrl)
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{
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struct device *dev = ctrl->device;
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struct nvme_hwmon_data *data;
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struct device *hwmon;
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int err;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->log = kzalloc(sizeof(*data->log), GFP_KERNEL);
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if (!data->log) {
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err = -ENOMEM;
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goto err_free_data;
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}
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data->ctrl = ctrl;
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mutex_init(&data->read_lock);
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err = nvme_hwmon_get_smart_log(data);
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if (err) {
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dev_warn(dev, "Failed to read smart log (error %d)\n", err);
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goto err_free_log;
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}
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hwmon = hwmon_device_register_with_info(dev, "nvme",
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data, &nvme_hwmon_chip_info,
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NULL);
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if (IS_ERR(hwmon)) {
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dev_warn(dev, "Failed to instantiate hwmon device\n");
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err = PTR_ERR(hwmon);
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goto err_free_log;
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}
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ctrl->hwmon_device = hwmon;
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return 0;
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err_free_log:
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kfree(data->log);
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err_free_data:
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kfree(data);
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return err;
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}
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void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
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{
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if (ctrl->hwmon_device) {
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struct nvme_hwmon_data *data =
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dev_get_drvdata(ctrl->hwmon_device);
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hwmon_device_unregister(ctrl->hwmon_device);
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ctrl->hwmon_device = NULL;
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kfree(data->log);
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kfree(data);
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}
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}
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