[PATCH linux dev-4.19 10/12] hwmon: Add PECI cputemp driver
Jae Hyun Yoo
jae.hyun.yoo at linux.intel.com
Wed Dec 19 11:02:34 AEDT 2018
This commit adds PECI cputemp hwmon driver.
Cc: Joel Stanley <joel at jms.id.au>
Cc: Andrew Jeffery <andrew at aj.id.au>
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
Reviewed-by: Haiyue Wang <haiyue.wang at linux.intel.com>
Reviewed-by: James Feist <james.feist at linux.intel.com>
Reviewed-by: Vernon Mauery <vernon.mauery at linux.intel.com>
Acked-by: Guenter Roeck <linux at roeck-us.net>
---
drivers/hwmon/Kconfig | 14 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/peci-cputemp.c | 394 +++++++++++++++++++++++++++++++++++++++++++
drivers/hwmon/peci-hwmon.h | 49 ++++++
4 files changed, 458 insertions(+)
create mode 100644 drivers/hwmon/peci-cputemp.c
create mode 100644 drivers/hwmon/peci-hwmon.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 532a0532d01b..2e34a1627022 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1308,6 +1308,20 @@ config SENSORS_PCF8591
These devices are hard to detect and rarely found on mainstream
hardware. If unsure, say N.
+config SENSORS_PECI_CPUTEMP
+ tristate "PECI CPU temperature monitoring support"
+ depends on PECI
+ select MFD_INTEL_PECI_CLIENT
+ help
+ If you say yes here you get support for the generic Intel PECI
+ cputemp driver which provides Digital Thermal Sensor (DTS) thermal
+ readings of the CPU package and CPU cores that are accessible using
+ the PECI Client Command Suite via the processor PECI client.
+ Check Documentation/hwmon/peci-cputemp for details.
+
+ This driver can also be built as a module. If so, the module
+ will be called peci-cputemp.
+
source drivers/hwmon/pmbus/Kconfig
config SENSORS_PWM_FAN
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index f5c7b442e69e..f37117fb9af3 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -141,6 +141,7 @@ obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
+obj-$(CONFIG_SENSORS_PECI_CPUTEMP) += peci-cputemp.o
obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o
diff --git a/drivers/hwmon/peci-cputemp.c b/drivers/hwmon/peci-cputemp.c
new file mode 100644
index 000000000000..11880c86a854
--- /dev/null
+++ b/drivers/hwmon/peci-cputemp.c
@@ -0,0 +1,394 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 Intel Corporation
+
+#include <linux/hwmon.h>
+#include <linux/jiffies.h>
+#include <linux/mfd/intel-peci-client.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include "peci-hwmon.h"
+
+#define DEFAULT_CHANNEL_NUMS 4
+#define CORETEMP_CHANNEL_NUMS CORE_NUMS_MAX
+#define CPUTEMP_CHANNEL_NUMS (DEFAULT_CHANNEL_NUMS + CORETEMP_CHANNEL_NUMS)
+
+/* The RESOLVED_CORES register in PCU of a client CPU */
+#define REG_RESOLVED_CORES_BUS 1
+#define REG_RESOLVED_CORES_DEVICE 30
+#define REG_RESOLVED_CORES_FUNCTION 3
+#define REG_RESOLVED_CORES_OFFSET 0xB4
+
+struct temp_group {
+ struct temp_data die;
+ struct temp_data tcontrol;
+ struct temp_data tthrottle;
+ struct temp_data tjmax;
+ struct temp_data core[CORETEMP_CHANNEL_NUMS];
+};
+
+struct peci_cputemp {
+ struct peci_client_manager *mgr;
+ struct device *dev;
+ char name[PECI_NAME_SIZE];
+ const struct cpu_gen_info *gen_info;
+ struct temp_group temp;
+ u32 core_mask;
+ u32 temp_config[CPUTEMP_CHANNEL_NUMS + 1];
+ uint config_idx;
+ struct hwmon_channel_info temp_info;
+ const struct hwmon_channel_info *info[2];
+ struct hwmon_chip_info chip;
+};
+
+enum cputemp_channels {
+ channel_die,
+ channel_tcontrol,
+ channel_tthrottle,
+ channel_tjmax,
+ channel_core,
+};
+
+static const u32 config_table[DEFAULT_CHANNEL_NUMS + 1] = {
+ /* Die temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+ HWMON_T_CRIT_HYST,
+
+ /* Tcontrol temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_CRIT,
+
+ /* Tthrottle temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT,
+
+ /* Tjmax temperature */
+ HWMON_T_LABEL | HWMON_T_INPUT,
+
+ /* Core temperature - for all core channels */
+ HWMON_T_LABEL | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+ HWMON_T_CRIT_HYST,
+};
+
+static const char *cputemp_label[CPUTEMP_CHANNEL_NUMS] = {
+ "Die",
+ "Tcontrol",
+ "Tthrottle",
+ "Tjmax",
+ "Core 0", "Core 1", "Core 2", "Core 3",
+ "Core 4", "Core 5", "Core 6", "Core 7",
+ "Core 8", "Core 9", "Core 10", "Core 11",
+ "Core 12", "Core 13", "Core 14", "Core 15",
+ "Core 16", "Core 17", "Core 18", "Core 19",
+ "Core 20", "Core 21", "Core 22", "Core 23",
+ "Core 24", "Core 25", "Core 26", "Core 27",
+};
+
+static s32 ten_dot_six_to_millidegree(s32 val)
+{
+ return ((val ^ 0x8000) - 0x8000) * 1000 / 64;
+}
+
+static int get_temp_targets(struct peci_cputemp *priv)
+{
+ s32 tthrottle_offset;
+ s32 tcontrol_margin;
+ u8 pkg_cfg[4];
+ int rc;
+
+ /**
+ * Just use only the tcontrol marker to determine if target values need
+ * update.
+ */
+ if (!peci_temp_need_update(&priv->temp.tcontrol))
+ return 0;
+
+ rc = peci_client_read_package_config(priv->mgr,
+ MBX_INDEX_TEMP_TARGET, 0, pkg_cfg);
+ if (rc)
+ return rc;
+
+ priv->temp.tjmax.value = pkg_cfg[2] * 1000;
+
+ tcontrol_margin = pkg_cfg[1];
+ tcontrol_margin = ((tcontrol_margin ^ 0x80) - 0x80) * 1000;
+ priv->temp.tcontrol.value = priv->temp.tjmax.value - tcontrol_margin;
+
+ tthrottle_offset = (pkg_cfg[3] & 0x2f) * 1000;
+ priv->temp.tthrottle.value = priv->temp.tjmax.value - tthrottle_offset;
+
+ peci_temp_mark_updated(&priv->temp.tcontrol);
+
+ return 0;
+}
+
+static int get_die_temp(struct peci_cputemp *priv)
+{
+ struct peci_get_temp_msg msg;
+ int rc;
+
+ if (!peci_temp_need_update(&priv->temp.die))
+ return 0;
+
+ msg.addr = priv->mgr->client->addr;
+
+ rc = peci_command(priv->mgr->client->adapter, PECI_CMD_GET_TEMP,
+ &msg);
+ if (rc)
+ return rc;
+
+ /* Note that the tjmax should be available before calling it */
+ priv->temp.die.value = priv->temp.tjmax.value +
+ (msg.temp_raw * 1000 / 64);
+
+ peci_temp_mark_updated(&priv->temp.die);
+
+ return 0;
+}
+
+static int get_core_temp(struct peci_cputemp *priv, int core_index)
+{
+ s32 core_dts_margin;
+ u8 pkg_cfg[4];
+ int rc;
+
+ if (!peci_temp_need_update(&priv->temp.core[core_index]))
+ return 0;
+
+ rc = peci_client_read_package_config(priv->mgr,
+ MBX_INDEX_PER_CORE_DTS_TEMP,
+ core_index, pkg_cfg);
+ if (rc)
+ return rc;
+
+ core_dts_margin = le16_to_cpup((__le16 *)pkg_cfg);
+
+ /**
+ * Processors return a value of the core DTS reading in 10.6 format
+ * (10 bits signed decimal, 6 bits fractional).
+ * Error codes:
+ * 0x8000: General sensor error
+ * 0x8001: Reserved
+ * 0x8002: Underflow on reading value
+ * 0x8003-0x81ff: Reserved
+ */
+ if (core_dts_margin >= 0x8000 && core_dts_margin <= 0x81ff)
+ return -EIO;
+
+ core_dts_margin = ten_dot_six_to_millidegree(core_dts_margin);
+
+ /* Note that the tjmax should be available before calling it */
+ priv->temp.core[core_index].value = priv->temp.tjmax.value +
+ core_dts_margin;
+
+ peci_temp_mark_updated(&priv->temp.core[core_index]);
+
+ return 0;
+}
+
+static int cputemp_read_string(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ if (attr != hwmon_temp_label)
+ return -EOPNOTSUPP;
+
+ *str = cputemp_label[channel];
+ return 0;
+}
+
+static int cputemp_read(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct peci_cputemp *priv = dev_get_drvdata(dev);
+ int rc, core_index;
+
+ if (channel >= CPUTEMP_CHANNEL_NUMS ||
+ !(priv->temp_config[channel] & BIT(attr)))
+ return -EOPNOTSUPP;
+
+ rc = get_temp_targets(priv);
+ if (rc)
+ return rc;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ switch (channel) {
+ case channel_die:
+ rc = get_die_temp(priv);
+ if (rc)
+ break;
+
+ *val = priv->temp.die.value;
+ break;
+ case channel_tcontrol:
+ *val = priv->temp.tcontrol.value;
+ break;
+ case channel_tthrottle:
+ *val = priv->temp.tthrottle.value;
+ break;
+ case channel_tjmax:
+ *val = priv->temp.tjmax.value;
+ break;
+ default:
+ core_index = channel - DEFAULT_CHANNEL_NUMS;
+ rc = get_core_temp(priv, core_index);
+ if (rc)
+ break;
+
+ *val = priv->temp.core[core_index].value;
+ break;
+ }
+ break;
+ case hwmon_temp_max:
+ *val = priv->temp.tcontrol.value;
+ break;
+ case hwmon_temp_crit:
+ *val = priv->temp.tjmax.value;
+ break;
+ case hwmon_temp_crit_hyst:
+ *val = priv->temp.tjmax.value - priv->temp.tcontrol.value;
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ break;
+ }
+
+ return rc;
+}
+
+static umode_t cputemp_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ const struct peci_cputemp *priv = data;
+
+ if (priv->temp_config[channel] & BIT(attr))
+ if (channel < DEFAULT_CHANNEL_NUMS ||
+ (channel >= DEFAULT_CHANNEL_NUMS &&
+ (priv->core_mask & BIT(channel - DEFAULT_CHANNEL_NUMS))))
+ return 0444;
+
+ return 0;
+}
+
+static const struct hwmon_ops cputemp_ops = {
+ .is_visible = cputemp_is_visible,
+ .read_string = cputemp_read_string,
+ .read = cputemp_read,
+};
+
+static int check_resolved_cores(struct peci_cputemp *priv)
+{
+ struct peci_rd_pci_cfg_local_msg msg;
+ int rc;
+
+ /* Get the RESOLVED_CORES register value */
+ msg.addr = priv->mgr->client->addr;
+ msg.bus = REG_RESOLVED_CORES_BUS;
+ msg.device = REG_RESOLVED_CORES_DEVICE;
+ msg.function = REG_RESOLVED_CORES_FUNCTION;
+ msg.reg = REG_RESOLVED_CORES_OFFSET;
+ msg.rx_len = 4;
+
+ rc = peci_command(priv->mgr->client->adapter,
+ PECI_CMD_RD_PCI_CFG_LOCAL, &msg);
+ if (rc)
+ return rc;
+
+ priv->core_mask = le32_to_cpup((__le32 *)msg.pci_config);
+ if (!priv->core_mask)
+ return -EAGAIN;
+
+ dev_dbg(priv->dev, "Scanned resolved cores: 0x%x\n", priv->core_mask);
+ return 0;
+}
+
+static int create_core_temp_info(struct peci_cputemp *priv)
+{
+ int rc, i;
+
+ rc = check_resolved_cores(priv);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < priv->gen_info->core_max; i++)
+ if (priv->core_mask & BIT(i))
+ while (i + DEFAULT_CHANNEL_NUMS >= priv->config_idx)
+ priv->temp_config[priv->config_idx++] =
+ config_table[channel_core];
+
+ return 0;
+}
+
+static int peci_cputemp_probe(struct platform_device *pdev)
+{
+ struct peci_client_manager *mgr = dev_get_drvdata(pdev->dev.parent);
+ struct device *dev = &pdev->dev;
+ struct peci_cputemp *priv;
+ struct device *hwmon_dev;
+ int rc;
+
+ if ((mgr->client->adapter->cmd_mask &
+ (BIT(PECI_CMD_GET_TEMP) | BIT(PECI_CMD_RD_PKG_CFG))) !=
+ (BIT(PECI_CMD_GET_TEMP) | BIT(PECI_CMD_RD_PKG_CFG)))
+ return -ENODEV;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->mgr = mgr;
+ priv->dev = dev;
+ priv->gen_info = mgr->gen_info;
+
+ snprintf(priv->name, PECI_NAME_SIZE, "peci_cputemp.cpu%d",
+ mgr->client->addr - PECI_BASE_ADDR);
+
+ priv->temp_config[priv->config_idx++] = config_table[channel_die];
+ priv->temp_config[priv->config_idx++] = config_table[channel_tcontrol];
+ priv->temp_config[priv->config_idx++] = config_table[channel_tthrottle];
+ priv->temp_config[priv->config_idx++] = config_table[channel_tjmax];
+
+ rc = create_core_temp_info(priv);
+ if (rc)
+ dev_dbg(dev, "Skipped creating core temp info\n");
+
+ priv->chip.ops = &cputemp_ops;
+ priv->chip.info = priv->info;
+
+ priv->info[0] = &priv->temp_info;
+
+ priv->temp_info.type = hwmon_temp;
+ priv->temp_info.config = priv->temp_config;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(priv->dev,
+ priv->name,
+ priv,
+ &priv->chip,
+ NULL);
+
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);
+
+ dev_dbg(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), priv->name);
+
+ return 0;
+}
+
+static const struct platform_device_id peci_cputemp_ids[] = {
+ { .name = "peci-cputemp", .driver_data = 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, peci_cputemp_ids);
+
+static struct platform_driver peci_cputemp_driver = {
+ .probe = peci_cputemp_probe,
+ .id_table = peci_cputemp_ids,
+ .driver = { .name = "peci-cputemp", },
+};
+module_platform_driver(peci_cputemp_driver);
+
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>");
+MODULE_DESCRIPTION("PECI cputemp driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hwmon/peci-hwmon.h b/drivers/hwmon/peci-hwmon.h
new file mode 100644
index 000000000000..6ca1855a86bb
--- /dev/null
+++ b/drivers/hwmon/peci-hwmon.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2018 Intel Corporation */
+
+#ifndef __PECI_HWMON_H
+#define __PECI_HWMON_H
+
+#include <linux/peci.h>
+
+#define TEMP_TYPE_PECI 6 /* Sensor type 6: Intel PECI */
+#define UPDATE_INTERVAL HZ
+
+/**
+ * struct temp_data - PECI temperature information
+ * @valid: flag to indicate the temperature value is valid
+ * @value: temperature value in millidegree Celsius
+ * @last_updated: time of the last update in jiffies
+ */
+struct temp_data {
+ uint valid;
+ s32 value;
+ ulong last_updated;
+};
+
+/**
+ * peci_temp_need_update - check whether temperature update is needed or not
+ * @temp: pointer to temperature data struct
+ *
+ * Return: true if update is needed, false if not.
+ */
+static inline bool peci_temp_need_update(struct temp_data *temp)
+{
+ if (temp->valid &&
+ time_before(jiffies, temp->last_updated + UPDATE_INTERVAL))
+ return false;
+
+ return true;
+}
+
+/**
+ * peci_temp_mark_updated - mark the temperature is updated
+ * @temp: pointer to temperature data struct
+ */
+static inline void peci_temp_mark_updated(struct temp_data *temp)
+{
+ temp->valid = 1;
+ temp->last_updated = jiffies;
+}
+
+#endif /* __PECI_HWMON_H */
--
2.7.4
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