This commit adds a generic PECI hwmon client driver implementation.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/peci-hwmon.c | 928
+++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 939 insertions(+)
create mode 100644 drivers/hwmon/peci-hwmon.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index ef23553ff5cb..f22e0c31f597 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1246,6 +1246,16 @@ 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 PECI
+ help
+ If you say yes here you get support for the generic PECI hwmon
+ driver.
+
+ This driver can also be built as a module. If so, the module
+ will be called peci-hwmon.
+
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 f814b4ace138..946f54b168e5 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -135,6 +135,7 @@ 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 000000000000..edd27744adcb
--- /dev/null
+++ b/drivers/hwmon/peci-hwmon.c
@@ -0,0 +1,928 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 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/of_device.h>
+#include <linux/peci.h>
+#include <linux/workqueue.h>
+
+#define DIMM_SLOT_NUMS_MAX 12 /* 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_TEMP_ATTRS 5
+#define DIMM_TEMP_ATTRS 2
+#define ATTR_NAME_LEN 24
+
+#define DEFAULT_ATTR_GRP_NUMS 5
+
+#define UPDATE_INTERVAL_MIN HZ
+#define DIMM_MASK_CHECK_DELAY msecs_to_jiffies(5000)
+
+enum sign {
+ POS,
+ NEG
+};
+
+struct temp_data {
+ bool valid;
+ s32 value;
+ unsigned long last_updated;
+};
+
+struct temp_group {
+ struct temp_data tjmax;
+ struct temp_data tcontrol;
+ struct temp_data tthrottle;
+ struct temp_data dts_margin;
+ struct temp_data die;
+ struct temp_data core[CORE_NUMS_MAX];
+ struct temp_data dimm[DIMM_SLOT_NUMS_MAX];
+};
+
+struct core_temp_group {
+ struct sensor_device_attribute sd_attrs[CORE_TEMP_ATTRS];
+ char attr_name[CORE_TEMP_ATTRS][ATTR_NAME_LEN];
+ struct attribute *attrs[CORE_TEMP_ATTRS + 1];
+ struct attribute_group attr_group;
+};
+
+struct dimm_temp_group {
+ struct sensor_device_attribute sd_attrs[DIMM_TEMP_ATTRS];
+ char attr_name[DIMM_TEMP_ATTRS][ATTR_NAME_LEN];
+ struct attribute *attrs[DIMM_TEMP_ATTRS + 1];
+ struct attribute_group attr_group;
+};
+
+struct peci_hwmon {
+ struct peci_client *client;
+ struct device *dev;
+ struct device *hwmon_dev;
+ struct workqueue_struct *work_queue;
+ struct delayed_work work_handler;
+ char name[PECI_NAME_SIZE];
+ struct temp_group temp;
+ u8 addr;
+ uint cpu_no;
+ u32 core_mask;
+ u32 dimm_mask;
+ const struct attribute_group *core_attr_groups[CORE_NUMS_MAX + 1];
+ const struct attribute_group *dimm_attr_groups[DIMM_SLOT_NUMS_MAX
+ 1];
+ uint global_idx;
+ uint core_idx;
+ uint dimm_idx;
+};
+
+enum label {
+ L_DIE,
+ L_DTS,
+ L_TCONTROL,
+ L_TTHROTTLE,
+ L_TJMAX,
+ L_MAX
+};
+
+static const char *peci_label[L_MAX] = {
+ "Die\n",
+ "DTS margin to Tcontrol\n",
+ "Tcontrol\n",
+ "Tthrottle\n",
+ "Tjmax\n",
+};
+
+static int send_peci_cmd(struct peci_hwmon *priv, enum peci_cmd cmd,
void *msg)
+{
+ return peci_command(priv->client->adapter, cmd, msg);
+}
+
+static int need_update(struct temp_data *temp)
+{
+ if (temp->valid &&
+ time_before(jiffies, temp->last_updated + UPDATE_INTERVAL_MIN))
+ return 0;
+
+ return 1;
+}
+
+static s32 ten_dot_six_to_millidegree(s32 x)
+{
+ return ((((x) ^ 0x8000) - 0x8000) * 1000 / 64);
+}
+
+static int get_tjmax(struct peci_hwmon *priv)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ int rc;
+
+ if (!priv->temp.tjmax.valid) {
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_TEMP_TARGET;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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 (!need_update(&priv->temp.tcontrol))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_TEMP_TARGET;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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 (!need_update(&priv->temp.tthrottle))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_TEMP_TARGET;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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 (!need_update(&priv->temp.die))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.addr = priv->addr;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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 (!need_update(&priv->temp.dts_margin))
+ return 0;
+
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_DTS_MARGIN;
+ msg.param = 0;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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 = ten_dot_six_to_millidegree(dts_margin);
+
+ 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 (!need_update(&priv->temp.core[core_index]))
+ return 0;
+
+ rc = get_tjmax(priv);
+ if (rc < 0)
+ return rc;
+
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_PER_CORE_DTS_TEMP;
+ msg.param = core_index;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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 = ten_dot_six_to_millidegree(core_dts_margin);
+
+ 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 = dimm_index / 2;
+ int dimm_order = dimm_index % 2;
+ int rc;
+
+ if (!need_update(&priv->temp.dimm[dimm_index]))
+ return 0;
+
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_DDR_DIMM_TEMP;
+ msg.param = channel;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_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_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_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\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, "DIMM %d (%c%d)\n",
+ sensor_attr->index, 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 struct attribute_group die_temp_attr_group = {
+ .attrs = die_temp_attrs,
+};
+
+/* DTS margin temperature */
+static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL, L_DTS);
+static SENSOR_DEVICE_ATTR(temp2_input, 0444, show_dts_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 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 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 struct attribute_group tthrottle_temp_attr_group = {
+ .attrs = tthrottle_temp_attrs,
+};
+
+/* Tjmax temperature */
+static SENSOR_DEVICE_ATTR(temp5_label, 0444, show_label, NULL, L_TJMAX);
+static SENSOR_DEVICE_ATTR(temp5_input, 0444, show_tjmax, NULL, 0);
+
+static struct attribute *tjmax_temp_attrs[] = {
+ &sensor_dev_attr_temp5_label.dev_attr.attr,
+ &sensor_dev_attr_temp5_input.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group tjmax_temp_attr_group = {
+ .attrs = tjmax_temp_attrs,
+};
+
+static const struct attribute_group *
+default_attr_groups[DEFAULT_ATTR_GRP_NUMS + 1] = {
+ &die_temp_attr_group,
+ &dts_margin_temp_attr_group,
+ &tcontrol_temp_attr_group,
+ &tthrottle_temp_attr_group,
+ &tjmax_temp_attr_group,
+ NULL
+};
+
+/* Core temperature */
+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 check_resolved_cores(struct peci_hwmon *priv)
+{
+ struct peci_rd_pci_cfg_local_msg msg;
+ int rc;
+
+ if (!(priv->client->adapter->cmd_mask &
BIT(PECI_CMD_RD_PCI_CFG_LOCAL)))
+ return -EINVAL;
+
+ /* Get the RESOLVED_CORES register value */
+ msg.addr = priv->addr;
+ msg.bus = 1;
+ msg.device = 30;
+ msg.function = 3;
+ msg.reg = 0xB4;
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_RD_PCI_CFG_LOCAL, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ priv->core_mask = msg.pci_config[3] << 24 |
+ msg.pci_config[2] << 16 |
+ msg.pci_config[1] << 8 |
+ msg.pci_config[0];
+
+ 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_group(struct peci_hwmon *priv, int core_no)
+{
+ struct core_temp_group *data;
+ int i;
+
+ data = devm_kzalloc(priv->dev, sizeof(struct core_temp_group),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ for (i = 0; i < CORE_TEMP_ATTRS; i++) {
+ snprintf(data->attr_name[i], ATTR_NAME_LEN,
+ "temp%d_%s", priv->global_idx, core_suffix[i]);
+ sysfs_attr_init(&data->sd_attrs[i].dev_attr.attr);
+ data->sd_attrs[i].dev_attr.attr.name = data->attr_name[i];
+ data->sd_attrs[i].dev_attr.attr.mode = 0444;
+ data->sd_attrs[i].dev_attr.show = core_show_fn[i];
+ if (i == 0 || i == 1) /* label or temp */
+ data->sd_attrs[i].index = core_no;
+ data->attrs[i] = &data->sd_attrs[i].dev_attr.attr;
+ }
+
+ data->attr_group.attrs = data->attrs;
+ priv->core_attr_groups[priv->core_idx++] = &data->attr_group;
+ priv->global_idx++;
+
+ return 0;
+}
+
+static int create_core_temp_groups(struct peci_hwmon *priv)
+{
+ int rc, i;
+
+ rc = check_resolved_cores(priv);
+ if (!rc) {
+ for (i = 0; i < CORE_NUMS_MAX; i++) {
+ if (priv->core_mask & BIT(i)) {
+ rc = create_core_temp_group(priv, i);
+ if (rc)
+ return rc;
+ }
+ }
+
+ rc = sysfs_create_groups(&priv->hwmon_dev->kobj,
+ priv->core_attr_groups);
+ }
+
+ return rc;
+}
+
+/* DIMM temperature */
+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 check_populated_dimms(struct peci_hwmon *priv)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ int i, rc, pass = 0;
+
+do_scan:
+ for (i = 0; i < (DIMM_SLOT_NUMS_MAX / 2); i++) {
+ msg.addr = priv->addr;
+ msg.index = MBX_INDEX_DDR_DIMM_TEMP;
+ msg.param = i; /* channel */
+ msg.rx_len = 4;
+
+ rc = send_peci_cmd(priv, PECI_CMD_RD_PKG_CFG, (void *)&msg);
+ if (rc < 0)
+ return rc;
+
+ if (msg.pkg_config[0]) /* DIMM #0 on the channel */
+ priv->dimm_mask |= BIT(i);
+
+ if (msg.pkg_config[1]) /* DIMM #1 on the channel */
+ priv->dimm_mask |= BIT(i + 1);
+ }
+
+ /* Do 2-pass scanning */
+ if (priv->dimm_mask && pass == 0) {
+ pass++;
+ goto do_scan;
+ }
+
+ if (!priv->dimm_mask)
+ return -EAGAIN;
+
+ dev_dbg(priv->dev, "Scanned populated DIMMs: 0x%x\n",
priv->dimm_mask);
+ return 0;
+}
+
+static int create_dimm_temp_group(struct peci_hwmon *priv, int dimm_no)
+{
+ struct dimm_temp_group *data;
+ int i;
+
+ data = devm_kzalloc(priv->dev, sizeof(struct dimm_temp_group),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ for (i = 0; i < DIMM_TEMP_ATTRS; i++) {
+ snprintf(data->attr_name[i], ATTR_NAME_LEN,
+ "temp%d_%s", priv->global_idx, dimm_suffix[i]);
+ sysfs_attr_init(&data->sd_attrs[i].dev_attr.attr);
+ data->sd_attrs[i].dev_attr.attr.name = data->attr_name[i];
+ data->sd_attrs[i].dev_attr.attr.mode = 0444;
+ data->sd_attrs[i].dev_attr.show = dimm_show_fn[i];
+ data->sd_attrs[i].index = dimm_no;
+ data->attrs[i] = &data->sd_attrs[i].dev_attr.attr;
+ }
+
+ data->attr_group.attrs = data->attrs;
+ priv->dimm_attr_groups[priv->dimm_idx++] = &data->attr_group;
+ priv->global_idx++;
+
+ return 0;
+}
+
+static int create_dimm_temp_groups(struct peci_hwmon *priv)
+{
+ int rc, i;
+
+ rc = check_populated_dimms(priv);
+ if (!rc) {
+ for (i = 0; i < DIMM_SLOT_NUMS_MAX; i++) {
+ if (priv->dimm_mask & BIT(i)) {
+ rc = create_dimm_temp_group(priv, i);
+ if (rc)
+ return rc;
+ }
+ }
+
+ rc = sysfs_create_groups(&priv->hwmon_dev->kobj,
+ priv->dimm_attr_groups);
+ if (!rc)
+ dev_dbg(priv->dev, "Done DIMM temp group creation\n");
+ } else if (rc == -EAGAIN) {
+ queue_delayed_work(priv->work_queue, &priv->work_handler,
+ DIMM_MASK_CHECK_DELAY);
+ dev_dbg(priv->dev, "Diferred DIMM temp group creation\n");
+ }
+
+ return rc;
+}
+
+static void create_dimm_temp_groups_delayed(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct peci_hwmon *priv = container_of(dwork, struct peci_hwmon,
+ work_handler);
+ int rc;
+
+ rc = create_dimm_temp_groups(priv);
+ if (rc && rc != -EAGAIN)
+ dev_dbg(priv->dev, "Skipped to creat DIMM temp groups\n");
+}
+
+static int peci_hwmon_probe(struct peci_client *client)
+{
+ struct device *dev = &client->dev;
+ struct peci_hwmon *priv;
+ int rc;
+
+ if ((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))) {
+ dev_err(dev, "Client doesn't support temperature monitoring\n");
+ return -EINVAL;
+ }
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->client = client;
+ priv->dev = dev;
+ priv->addr = client->addr;
+ priv->cpu_no = priv->addr - PECI_BASE_ADDR;
+
+ snprintf(priv->name, PECI_NAME_SIZE, "peci_hwmon.cpu%d",
priv->cpu_no);
+
+ priv->work_queue = create_singlethread_workqueue(priv->name);
+ if (!priv->work_queue)
+ return -ENOMEM;
+
+ priv->hwmon_dev = hwmon_device_register_with_groups(priv->dev,
+ priv->name,
+ priv,
+ default_attr_groups);
+
+ rc = PTR_ERR_OR_ZERO(priv->hwmon_dev);
+ if (rc) {
+ dev_err(dev, "Failed to register peci hwmon\n");
+ return rc;
+ }
+
+ priv->global_idx = DEFAULT_ATTR_GRP_NUMS + 1;
+
+ rc = create_core_temp_groups(priv);
+ if (rc) {
+ dev_err(dev, "Failed to create core groups\n");
+ return rc;
+ }
+
+ INIT_DELAYED_WORK(&priv->work_handler,
create_dimm_temp_groups_delayed);
+
+ rc = create_dimm_temp_groups(priv);
+ if (rc && rc != -EAGAIN)
+ dev_dbg(dev, "Skipped to creat DIMM temp groups\n");
+
+ dev_dbg(dev, "peci hwmon for CPU at 0x%x registered\n", priv->addr);
+
+ return 0;
+}
+
+static int peci_hwmon_remove(struct peci_client *client)
+{
+ struct peci_hwmon *priv = dev_get_drvdata(&client->dev);
+
+ cancel_delayed_work(&priv->work_handler);
+ destroy_workqueue(priv->work_queue);
+ sysfs_remove_groups(&priv->hwmon_dev->kobj, priv->core_attr_groups);
+ sysfs_remove_groups(&priv->hwmon_dev->kobj, priv->dimm_attr_groups);
+ hwmon_device_unregister(priv->hwmon_dev);
+
+ return 0;
+}
+
+static const struct of_device_id peci_of_table[] = {
+ { .compatible = "intel,peci-hwmon", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, peci_of_table);
+
+static struct peci_driver peci_hwmon_driver = {
+ .probe = peci_hwmon_probe,
+ .remove = peci_hwmon_remove,
+ .driver = {
+ .name = "peci-hwmon",
+ .of_match_table = of_match_ptr(peci_of_table),
+ },
+};
+module_peci_driver(peci_hwmon_driver);
+
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("PECI hwmon driver");
+MODULE_LICENSE("GPL v2");
