This commit adds driver implementation for a generic PECI hwmon.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 6 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/peci-hwmon.c | 953 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 960 insertions(+)
create mode 100644 drivers/hwmon/peci-hwmon.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 9256dd0..3a62c60 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1234,6 +1234,12 @@ config SENSORS_NCT7904
This driver can also be built as a module. If so, the module
will be called nct7904.
+config SENSORS_PECI_HWMON
+ tristate "PECI hwmon support"
+ depends on ASPEED_PECI
+ help
+ If you say yes here you get support for the generic PECI hwmon driver.
+
config SENSORS_NSA320
tristate "ZyXEL NSA320 and compatible fan speed and temperature sensors"
depends on GPIOLIB && OF
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 98000fc..41d43a5 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -131,6 +131,7 @@ obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
obj-$(CONFIG_SENSORS_NSA320) += nsa320-hwmon.o
obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o
+obj-$(CONFIG_SENSORS_PECI_HWMON) += peci-hwmon.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
diff --git a/drivers/hwmon/peci-hwmon.c b/drivers/hwmon/peci-hwmon.c
new file mode 100644
index 0000000..2d2a288
--- /dev/null
+++ b/drivers/hwmon/peci-hwmon.c
@@ -0,0 +1,953 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Intel Corporation
+
+#include <linux/delay.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/syscalls.h>
+#include <misc/peci.h>
+
+#define DEVICE_NAME "peci-hwmon"
+#define HWMON_NAME "peci_hwmon"
+
+#define CPU_ID_MAX 8 /* Max CPU number configured by socket ID */
+#define DIMM_NUMS_MAX 16 /* Max DIMM numbers (channel ranks x 2) */
+#define CORE_NUMS_MAX 28 /* Max core numbers (max on SKX Platinum) */
+#define TEMP_TYPE_PECI 6 /* Sensor type 6: Intel PECI */
+#define CORE_INDEX_OFFSET 100 /* sysfs filename start offset for core temp */
+#define DIMM_INDEX_OFFSET 200 /* sysfs filename start offset for DIMM temp */
+#define TEMP_NAME_HEADER_LEN 4 /* sysfs temp type header length */
+#define OF_DIMM_NUMS_DEFAULT 16 /* default dimm-nums setting */
+
+#define CORE_TEMP_ATTRS 5
+#define DIMM_TEMP_ATTRS 2
+#define ATTR_NAME_LEN 24
+
+#define UPDATE_INTERVAL_MIN HZ
+
+enum sign_t {
+ POS,
+ NEG
+};
+
+struct cpuinfo_t {
+ bool valid;
+ u32 dib;
+ u8 cpuid;
+ u8 platform_id;
+ u32 microcode;
+ u8 logical_thread_nums;
+};
+
+struct temp_data_t {
+ bool valid;
+ s32 value;
+ unsigned long last_updated;
+};
+
+struct temp_group_t {
+ struct temp_data_t tjmax;
+ struct temp_data_t tcontrol;
+ struct temp_data_t tthrottle;
+ struct temp_data_t dts_margin;
+ struct temp_data_t die;
+ struct temp_data_t core[CORE_NUMS_MAX];
+ struct temp_data_t dimm[DIMM_NUMS_MAX];
+};
+
+struct core_temp_attr_group_t {
+ struct sensor_device_attribute sd_attrs[CORE_NUMS_MAX][CORE_TEMP_ATTRS];
+ char attr_name[CORE_NUMS_MAX][CORE_TEMP_ATTRS][ATTR_NAME_LEN];
+ struct attribute *attrs[CORE_NUMS_MAX][CORE_TEMP_ATTRS + 1];
+ struct attribute_group attr_group[CORE_NUMS_MAX];
+};
+
+struct dimm_temp_attr_group_t {
+ struct sensor_device_attribute sd_attrs[DIMM_NUMS_MAX][DIMM_TEMP_ATTRS];
+ char attr_name[DIMM_NUMS_MAX][DIMM_TEMP_ATTRS][ATTR_NAME_LEN];
+ struct attribute *attrs[DIMM_NUMS_MAX][DIMM_TEMP_ATTRS + 1];
+ struct attribute_group attr_group[DIMM_NUMS_MAX];
+};
+
+struct peci_hwmon {
+ struct device *dev;
+ struct device *hwmon_dev;
+ char name[NAME_MAX];
+ const struct attribute_group **groups;
+ struct cpuinfo_t cpuinfo;
+ struct temp_group_t temp;
+ u32 cpu_id;
+ bool show_core;
+ u32 core_nums;
+ u32 dimm_nums;
+ atomic_t core_group_created;
+ struct core_temp_attr_group_t core;
+ struct dimm_temp_attr_group_t dimm;
+};
+
+enum label_t {
+ L_DIE,
+ L_DTS,
+ L_TCONTROL,
+ L_TTHROTTLE,
+ L_MAX
+};
+
+static const char *peci_label[L_MAX] = {
+ "Die temperature\n",
+ "DTS thermal margin to Tcontrol\n",
+ "Tcontrol temperature\n",
+ "Tthrottle temperature\n",
+};
+
+static DEFINE_MUTEX(peci_hwmon_lock);
+
+static int create_core_temp_group(struct peci_hwmon *priv, int core_no);
+
+
+static int xfer_peci_msg(int cmd, void *pmsg)
+{
+ int rc;
+
+ mutex_lock(&peci_hwmon_lock);
+ rc = peci_ioctl(NULL, cmd, (unsigned long)pmsg);
+ mutex_unlock(&peci_hwmon_lock);
+
+ return rc;
+}
+
+static int get_cpuinfo(struct peci_hwmon *priv)
+{
+ struct peci_get_dib_msg dib_msg;
+ struct peci_rd_pkg_cfg_msg cfg_msg;
+ int rc, i;
+
+ if (!priv->cpuinfo.valid) {
+ dib_msg.target = PECI_BASE_ADDR + priv->cpu_id;
+
+ rc = xfer_peci_msg(PECI_IOC_GET_DIB, (void *)&dib_msg);
+ if (rc < 0)
+ return rc;
+
+ priv->cpuinfo.dib = dib_msg.dib;
+
+ cfg_msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ cfg_msg.index = MBX_INDEX_CPU_ID;
+ cfg_msg.param = 0;
+ cfg_msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&cfg_msg);
+ if (rc < 0)
+ return rc;
+
+ priv->cpuinfo.cpuid = cfg_msg.pkg_config[0];
+
+ cfg_msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ cfg_msg.index = MBX_INDEX_CPU_ID;
+ cfg_msg.param = 1;
+ cfg_msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&cfg_msg);
+ if (rc < 0)
+ return rc;
+
+ priv->cpuinfo.platform_id = cfg_msg.pkg_config[0];
+
+ cfg_msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ cfg_msg.index = MBX_INDEX_CPU_ID;
+ cfg_msg.param = 3;
+ cfg_msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&cfg_msg);
+ if (rc < 0)
+ return rc;
+
+ priv->cpuinfo.logical_thread_nums = cfg_msg.pkg_config[0] + 1;
+
+ cfg_msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ cfg_msg.index = MBX_INDEX_CPU_ID;
+ cfg_msg.param = 4;
+ cfg_msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&cfg_msg);
+ if (rc < 0)
+ return rc;
+
+ priv->cpuinfo.microcode = (cfg_msg.pkg_config[3] << 24) |
+ (cfg_msg.pkg_config[2] << 16) |
+ (cfg_msg.pkg_config[1] << 8) |
+ cfg_msg.pkg_config[0];
+
+ priv->core_nums = priv->cpuinfo.logical_thread_nums / 2;
+
+ if (priv->show_core &&
+ atomic_inc_return(&priv->core_group_created) == 1) {
+ for (i = 0; i < priv->core_nums; i++) {
+ rc = create_core_temp_group(priv, i);
+ if (rc != 0) {
+ dev_err(priv->dev,
+ "Failed to create core temp group\n");
+ for (--i; i >= 0; i--) {
+ sysfs_remove_group(
+ &priv->hwmon_dev->kobj,
+ &priv->core.attr_group[i]);
+ }
+ atomic_set(&priv->core_group_created,
+ 0);
+ return rc;
+ }
+ }
+ }
+
+ priv->cpuinfo.valid = true;
+ }
+
+ return 0;
+}
+
+static int get_tjmax(struct peci_hwmon *priv)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ int rc;
+
+ rc = get_cpuinfo(priv);
+ if (rc < 0)
+ return rc;
+
+ if (!priv->temp.tjmax.valid) {
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ msg.index = MBX_INDEX_TEMP_TARGET;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ priv->temp.tjmax.value = (s32)msg.pkg_config[2] * 1000;
+ priv->temp.tjmax.valid = true;
+ }
+
+ return 0;
+}
+
+static int get_tcontrol(struct peci_hwmon *priv)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ s32 tcontrol_margin;
+ int rc;
+
+ if (priv->temp.tcontrol.valid &&
+ time_before(jiffies, priv->temp.tcontrol.last_updated +
+ UPDATE_INTERVAL_MIN))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ msg.index = MBX_INDEX_TEMP_TARGET;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ tcontrol_margin = msg.pkg_config[1];
+ tcontrol_margin = ((tcontrol_margin ^ 0x80) - 0x80) * 1000;
+
+ priv->temp.tcontrol.value = priv->temp.tjmax.value - tcontrol_margin;
+
+ if (!priv->temp.tcontrol.valid) {
+ priv->temp.tcontrol.last_updated = INITIAL_JIFFIES;
+ priv->temp.tcontrol.valid = true;
+ } else {
+ priv->temp.tcontrol.last_updated = jiffies;
+ }
+
+ return 0;
+}
+
+static int get_tthrottle(struct peci_hwmon *priv)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ s32 tthrottle_offset;
+ int rc;
+
+ if (priv->temp.tthrottle.valid &&
+ time_before(jiffies, priv->temp.tthrottle.last_updated +
+ UPDATE_INTERVAL_MIN))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ msg.index = MBX_INDEX_TEMP_TARGET;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ tthrottle_offset = (msg.pkg_config[3] & 0x2f) * 1000;
+ priv->temp.tthrottle.value = priv->temp.tjmax.value - tthrottle_offset;
+
+ if (!priv->temp.tthrottle.valid) {
+ priv->temp.tthrottle.last_updated = INITIAL_JIFFIES;
+ priv->temp.tthrottle.valid = true;
+ } else {
+ priv->temp.tthrottle.last_updated = jiffies;
+ }
+
+ return 0;
+}
+
+static int get_die_temp(struct peci_hwmon *priv)
+{
+ struct peci_get_temp_msg msg;
+ int rc;
+
+ if (priv->temp.die.valid &&
+ time_before(jiffies, priv->temp.die.last_updated +
+ UPDATE_INTERVAL_MIN))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+
+ rc = xfer_peci_msg(PECI_IOC_GET_TEMP, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ priv->temp.die.value = priv->temp.tjmax.value +
+ ((s32)msg.temp_raw * 1000 / 64);
+
+ if (!priv->temp.die.valid) {
+ priv->temp.die.last_updated = INITIAL_JIFFIES;
+ priv->temp.die.valid = true;
+ } else {
+ priv->temp.die.last_updated = jiffies;
+ }
+
+ return 0;
+}
+
+static int get_dts_margin(struct peci_hwmon *priv)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ s32 dts_margin;
+ int rc;
+
+ if (priv->temp.dts_margin.valid &&
+ time_before(jiffies, priv->temp.dts_margin.last_updated +
+ UPDATE_INTERVAL_MIN))
+ return 0;
+
+ rc = get_cpuinfo(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ msg.index = MBX_INDEX_DTS_MARGIN;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ dts_margin = (msg.pkg_config[1] << 8) | msg.pkg_config[0];
+
+ /*
+ * Processors return a value of 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 (dts_margin >= 0x8000 && dts_margin <= 0x81ff)
+ return -1;
+
+ dts_margin = ((dts_margin ^ 0x8000) - 0x8000) * 1000 / 64;
+
+ priv->temp.dts_margin.value = dts_margin;
+
+ if (!priv->temp.dts_margin.valid) {
+ priv->temp.dts_margin.last_updated = INITIAL_JIFFIES;
+ priv->temp.dts_margin.valid = true;
+ } else {
+ priv->temp.dts_margin.last_updated = jiffies;
+ }
+
+ return 0;
+}
+
+static int get_core_temp(struct peci_hwmon *priv, int core_index)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ s32 core_dts_margin;
+ int rc;
+
+ if (priv->temp.core[core_index].valid &&
+ time_before(jiffies, priv->temp.core[core_index].last_updated +
+ UPDATE_INTERVAL_MIN))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ msg.index = MBX_INDEX_PER_CORE_DTS_TEMP;
+ msg.param = core_index;
+ msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ core_dts_margin = (msg.pkg_config[1] << 8) | msg.pkg_config[0];
+
+ /*
+ * 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 -1;
+
+ core_dts_margin = ((core_dts_margin ^ 0x8000) - 0x8000) * 1000 / 64;
+
+ priv->temp.core[core_index].value = priv->temp.tjmax.value +
+ core_dts_margin;
+
+ if (!priv->temp.core[core_index].valid) {
+ priv->temp.core[core_index].last_updated = INITIAL_JIFFIES;
+ priv->temp.core[core_index].valid = true;
+ } else {
+ priv->temp.core[core_index].last_updated = jiffies;
+ }
+
+ return 0;
+}
+
+static int get_dimm_temp(struct peci_hwmon *priv, int dimm_index)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ int channel_rank = dimm_index / 2;
+ int dimm_order = dimm_index % 2;
+ int rc;
+
+ if (priv->temp.core[dimm_index].valid &&
+ time_before(jiffies, priv->temp.core[dimm_index].last_updated +
+ UPDATE_INTERVAL_MIN))
+ return 0;
+
+ rc = get_cpuinfo(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.target = PECI_BASE_ADDR + priv->cpu_id;
+ msg.index = MBX_INDEX_DDR_DIMM_TEMP;
+ msg.param = channel_rank;
+ msg.rx_len = 4;
+
+ rc = xfer_peci_msg(PECI_IOC_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ priv->temp.dimm[dimm_index].value = msg.pkg_config[dimm_order] * 1000;
+
+ if (!priv->temp.dimm[dimm_index].valid) {
+ priv->temp.dimm[dimm_index].last_updated = INITIAL_JIFFIES;
+ priv->temp.dimm[dimm_index].valid = true;
+ } else {
+ priv->temp.dimm[dimm_index].last_updated = jiffies;
+ }
+
+ return 0;
+}
+
+static ssize_t show_info(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ int rc;
+
+ rc = get_cpuinfo(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "dib : 0x%08x\n"
+ "cpuid : 0x%x\n"
+ "platform id : %d\n"
+ "stepping : %d\n"
+ "microcode : 0x%08x\n"
+ "logical thread nums : %d\n",
+ priv->cpuinfo.dib,
+ priv->cpuinfo.cpuid,
+ priv->cpuinfo.platform_id,
+ priv->cpuinfo.cpuid & 0xf,
+ priv->cpuinfo.microcode,
+ priv->cpuinfo.logical_thread_nums);
+}
+
+static ssize_t show_tcontrol(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ int rc;
+
+ rc = get_tcontrol(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.tcontrol.value);
+}
+
+static ssize_t show_tcontrol_margin(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ int rc;
+
+ rc = get_tcontrol(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", sensor_attr->index == POS ?
+ priv->temp.tjmax.value -
+ priv->temp.tcontrol.value :
+ priv->temp.tcontrol.value -
+ priv->temp.tjmax.value);
+}
+
+static ssize_t show_tthrottle(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ int rc;
+
+ rc = get_tthrottle(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.tthrottle.value);
+}
+
+static ssize_t show_tjmax(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ int rc;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.tjmax.value);
+}
+
+static ssize_t show_die_temp(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ int rc;
+
+ rc = get_die_temp(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.die.value);
+}
+
+static ssize_t show_dts_therm_margin(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ int rc;
+
+ rc = get_dts_margin(priv);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.dts_margin.value);
+}
+
+static ssize_t show_core_temp(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ int core_index = sensor_attr->index;
+ int rc;
+
+ rc = get_core_temp(priv, core_index);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.core[core_index].value);
+}
+
+static ssize_t show_dimm_temp(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(dev);
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+ int dimm_index = sensor_attr->index;
+ int rc;
+
+ rc = get_dimm_temp(priv, dimm_index);
+ if (rc < 0)
+ return rc;
+
+ return sprintf(buf, "%d\n", priv->temp.dimm[dimm_index].value);
+}
+
+static ssize_t show_value(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+
+ return sprintf(buf, "%d\n", sensor_attr->index);
+}
+
+static ssize_t show_label(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+
+ return sprintf(buf, peci_label[sensor_attr->index]);
+}
+
+static ssize_t show_core_label(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+
+ return sprintf(buf, "Core #%d temperature\n", sensor_attr->index);
+}
+
+static ssize_t show_dimm_label(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+
+ char channel = 'A' + (sensor_attr->index / 2);
+ int index = sensor_attr->index % 2;
+
+ return sprintf(buf, "Channel Rank %c DDR DIMM #%d temperature\n",
+ channel, index);
+}
+
+/* Die temperature */
+static SENSOR_DEVICE_ATTR(temp1_label, 0444, show_label, NULL, L_DIE);
+static SENSOR_DEVICE_ATTR(temp1_input, 0444, show_die_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, 0444, show_tcontrol, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit, 0444, show_tjmax, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_crit_hyst, 0444, show_tcontrol_margin, NULL,
+ POS);
+
+static struct attribute *die_temp_attrs[] = {
+ &sensor_dev_attr_temp1_label.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group die_temp_attr_group = {
+ .attrs = die_temp_attrs,
+};
+
+/* DTS thermal margin temperature */
+static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL, L_DTS);
+static SENSOR_DEVICE_ATTR(temp2_input, 0444, show_dts_therm_margin, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_min, 0444, show_value, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_lcrit, 0444, show_tcontrol_margin, NULL, NEG);
+
+static struct attribute *dts_margin_temp_attrs[] = {
+ &sensor_dev_attr_temp2_label.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_lcrit.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group dts_margin_temp_attr_group = {
+ .attrs = dts_margin_temp_attrs,
+};
+
+/* Tcontrol temperature */
+static SENSOR_DEVICE_ATTR(temp3_label, 0444, show_label, NULL, L_TCONTROL);
+static SENSOR_DEVICE_ATTR(temp3_input, 0444, show_tcontrol, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp3_crit, 0444, show_tjmax, NULL, 0);
+
+static struct attribute *tcontrol_temp_attrs[] = {
+ &sensor_dev_attr_temp3_label.dev_attr.attr,
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_crit.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group tcontrol_temp_attr_group = {
+ .attrs = tcontrol_temp_attrs,
+};
+
+/* Tthrottle temperature */
+static SENSOR_DEVICE_ATTR(temp4_label, 0444, show_label, NULL, L_TTHROTTLE);
+static SENSOR_DEVICE_ATTR(temp4_input, 0444, show_tthrottle, NULL, 0);
+
+static struct attribute *tthrottle_temp_attrs[] = {
+ &sensor_dev_attr_temp4_label.dev_attr.attr,
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group tthrottle_temp_attr_group = {
+ .attrs = tthrottle_temp_attrs,
+};
+
+/* CPU info */
+static SENSOR_DEVICE_ATTR(info, 0444, show_info, NULL, 0);
+
+static struct attribute *info_attrs[] = {
+ &sensor_dev_attr_info.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group info_attr_group = {
+ .attrs = info_attrs,
+};
+
+const struct attribute_group *peci_hwmon_attr_groups[] = {
+ &info_attr_group,
+ &die_temp_attr_group,
+ &dts_margin_temp_attr_group,
+ &tcontrol_temp_attr_group,
+ &tthrottle_temp_attr_group,
+ NULL
+};
+
+static ssize_t (*const core_show_fn[CORE_TEMP_ATTRS]) (struct device *dev,
+ struct device_attribute *devattr, char *buf) = {
+ show_core_label,
+ show_core_temp,
+ show_tcontrol,
+ show_tjmax,
+ show_tcontrol_margin,
+};
+
+static const char *const core_suffix[CORE_TEMP_ATTRS] = {
+ "label",
+ "input",
+ "max",
+ "crit",
+ "crit_hyst",
+};
+
+static int create_core_temp_group(struct peci_hwmon *priv, int core_no)
+{
+ int i;
+
+ for (i = 0; i < CORE_TEMP_ATTRS; i++) {
+ snprintf(priv->core.attr_name[core_no][i],
+ ATTR_NAME_LEN, "temp%d_%s",
+ CORE_INDEX_OFFSET + core_no, core_suffix[i]);
+ sysfs_attr_init(
+ &priv->core.sd_attrs[core_no][i].dev_attr.attr);
+ priv->core.sd_attrs[core_no][i].dev_attr.attr.name =
+ priv->core.attr_name[core_no][i];
+ priv->core.sd_attrs[core_no][i].dev_attr.attr.mode = 0444;
+ priv->core.sd_attrs[core_no][i].dev_attr.show = core_show_fn[i];
+ if (i == 0 || i == 1) /* label or temp */
+ priv->core.sd_attrs[core_no][i].index = core_no;
+ priv->core.attrs[core_no][i] =
+ &priv->core.sd_attrs[core_no][i].dev_attr.attr;
+ }
+
+ priv->core.attr_group[core_no].attrs = priv->core.attrs[core_no];
+
+ return sysfs_create_group(&priv->hwmon_dev->kobj,
+ &priv->core.attr_group[core_no]);
+}
+
+static ssize_t (*const dimm_show_fn[DIMM_TEMP_ATTRS]) (struct device *dev,
+ struct device_attribute *devattr, char *buf) = {
+ show_dimm_label,
+ show_dimm_temp,
+};
+
+static const char *const dimm_suffix[DIMM_TEMP_ATTRS] = {
+ "label",
+ "input",
+};
+
+static int create_dimm_temp_group(struct peci_hwmon *priv, int dimm_no)
+{
+ int i;
+
+ for (i = 0; i < DIMM_TEMP_ATTRS; i++) {
+ snprintf(priv->dimm.attr_name[dimm_no][i],
+ ATTR_NAME_LEN, "temp%d_%s",
+ DIMM_INDEX_OFFSET + dimm_no, dimm_suffix[i]);
+ sysfs_attr_init(&priv->dimm.sd_attrs[dimm_no][i].dev_attr.attr);
+ priv->dimm.sd_attrs[dimm_no][i].dev_attr.attr.name =
+ priv->dimm.attr_name[dimm_no][i];
+ priv->dimm.sd_attrs[dimm_no][i].dev_attr.attr.mode = 0444;
+ priv->dimm.sd_attrs[dimm_no][i].dev_attr.show = dimm_show_fn[i];
+ priv->dimm.sd_attrs[dimm_no][i].index = dimm_no;
+ priv->dimm.attrs[dimm_no][i] =
+ &priv->dimm.sd_attrs[dimm_no][i].dev_attr.attr;
+ }
+
+ priv->dimm.attr_group[dimm_no].attrs = priv->dimm.attrs[dimm_no];
+
+ return sysfs_create_group(&priv->hwmon_dev->kobj,
+ &priv->dimm.attr_group[dimm_no]);
+}
+
+static int peci_hwmon_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct peci_hwmon *priv;
+ struct device *hwmon;
+ int rc, i;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->dev = dev;
+
+ rc = of_property_read_u32(np, "cpu-id", &priv->cpu_id);
+ if (rc || priv->cpu_id >= CPU_ID_MAX) {
+ dev_err(dev, "Invalid cpu-id configuration\n");
+ return rc;
+ }
+
+ rc = of_property_read_u32(np, "dimm-nums", &priv->dimm_nums);
+ if (rc || priv->dimm_nums > DIMM_NUMS_MAX) {
+ dev_warn(dev, "Invalid dimm-nums : %u. Use default : %u\n",
+ priv->dimm_nums, OF_DIMM_NUMS_DEFAULT);
+ priv->dimm_nums = OF_DIMM_NUMS_DEFAULT;
+ }
+
+ priv->show_core = of_property_read_bool(np, "show-core");
+
+ priv->groups = peci_hwmon_attr_groups;
+
+ snprintf(priv->name, NAME_MAX, HWMON_NAME ".cpu%d", priv->cpu_id);
+
+ hwmon = devm_hwmon_device_register_with_groups(dev,
+ priv->name,
+ priv, priv->groups);
+
+ rc = PTR_ERR_OR_ZERO(hwmon);
+ if (rc != 0) {
+ dev_err(dev, "Failed to register peci hwmon\n");
+ return rc;
+ }
+
+ priv->hwmon_dev = hwmon;
+
+ for (i = 0; i < priv->dimm_nums; i++) {
+ rc = create_dimm_temp_group(priv, i);
+ if (rc != 0) {
+ dev_err(dev, "Failed to create dimm temp group\n");
+ for (--i; i >= 0; i--) {
+ sysfs_remove_group(&priv->hwmon_dev->kobj,
+ &priv->dimm.attr_group[i]);
+ }
+ return rc;
+ }
+ }
+
+ /*
+ * Try to create core temp group now. It will be created if CPU is
+ * curretnly online or it will be created after the first reading of
+ * cpuinfo from the online CPU otherwise.
+ */
+ if (priv->show_core)
+ (void) get_cpuinfo(priv);
+
+ dev_info(dev, "peci hwmon for CPU#%d registered\n", priv->cpu_id);
+
+ return rc;
+}
+
+static int peci_hwmon_remove(struct platform_device *pdev)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(&pdev->dev);
+ int i;
+
+ if (atomic_read(&priv->core_group_created))
+ for (i = 0; i < priv->core_nums; i++) {
+ sysfs_remove_group(&priv->hwmon_dev->kobj,
+ &priv->core.attr_group[i]);
+ }
+
+ for (i = 0; i < priv->dimm_nums; i++) {
+ sysfs_remove_group(&priv->hwmon_dev->kobj,
+ &priv->dimm.attr_group[i]);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id peci_of_table[] = {
+ { .compatible = "peci-hwmon", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, peci_of_table);
+
+static struct platform_driver peci_hwmon_driver = {
+ .probe = peci_hwmon_probe,
+ .remove = peci_hwmon_remove,
+ .driver = {
+ .name = DEVICE_NAME,
+ .of_match_table = peci_of_table,
+ },
+};
+
+module_platform_driver(peci_hwmon_driver);
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PECI hwmon driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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