Hi Stef,

Thanks for sharing your time to test it.

That is expected result in v2. Previously in v1, it used delayed creation on core temperature group so it was okay if hwmon driver is registered when client CPU is powered down, but in v2, the driver should check resolved cores at probing time to prevent the delayed creation on core temperature group and indexing gap which breaks hwmon subsystem's common rule, so I added peci_detect() into peci_new_device() in PECI core driver to check online status of the client CPU when registering a new device.

You may need to use dynamic dtoverlay for loading/unloading a PECI hwmon driver according to the current client CPU power state. It means a PECI hwmon driver can be registered only when the client CPU is powered on. This design will be kept in v3 as well.

Thanks,
Jae

On 3/13/2018 2:32 AM, Stef van Os wrote:
Hi Jae,

I tried version 1 and 2 of your PECI patch on our (AST2500 / Xeon E5 v4) system. The V1 patchset works as expected (reading back temperature 0 until PECI is up), but the hwmon driver probe fails with version 2. It communicates with the Xeon and assumes during kernel boot of the Aspeed that PECI to the Xeon's is already up and running, but our system enables the main Xeon supplies from AST2500 userspace.

If I load the hwmon driver as a module to load later on, the driver does not call probe like e.g. a I2C driver on the I2C bus does. Am I using V2 wrongly?

BR,
Stef

On 02/21/2018 05:16 PM, Jae Hyun Yoo wrote:
This commit adds a generic PECI hwmon client driver implementation.

Signed-off-by: Jae Hyun Yoo <jae.hyun....@linux.intel.com>
---
  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....@linux.intel.com>");
+MODULE_DESCRIPTION("PECI hwmon driver");
+MODULE_LICENSE("GPL v2");


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