diff mbox series

[v4,1/2] scsi: ufs: Probe for temperature notification support

Message ID 20210913133303.10154-2-avri.altman@wdc.com (mailing list archive)
State Superseded
Headers show
Series Add temperature notification support | expand

Commit Message

Avri Altman Sept. 13, 2021, 1:33 p.m. UTC
Probe the dExtendedUFSFeaturesSupport register for the device's
temperature notification support, and if supported, add a hw monitor
device.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
 drivers/scsi/ufs/Kconfig     |   9 ++
 drivers/scsi/ufs/Makefile    |   1 +
 drivers/scsi/ufs/ufs-hwmon.c | 194 +++++++++++++++++++++++++++++++++++
 drivers/scsi/ufs/ufs.h       |   7 ++
 drivers/scsi/ufs/ufshcd.c    |  26 +++++
 drivers/scsi/ufs/ufshcd.h    |  18 ++++
 6 files changed, 255 insertions(+)
 create mode 100644 drivers/scsi/ufs/ufs-hwmon.c

Comments

Guenter Roeck Sept. 13, 2021, 2:44 p.m. UTC | #1
On 9/13/21 6:33 AM, Avri Altman wrote:
> Probe the dExtendedUFSFeaturesSupport register for the device's
> temperature notification support, and if supported, add a hw monitor
> device.
> 
> Signed-off-by: Avri Altman <avri.altman@wdc.com>
> ---
>   drivers/scsi/ufs/Kconfig     |   9 ++
>   drivers/scsi/ufs/Makefile    |   1 +
>   drivers/scsi/ufs/ufs-hwmon.c | 194 +++++++++++++++++++++++++++++++++++
>   drivers/scsi/ufs/ufs.h       |   7 ++
>   drivers/scsi/ufs/ufshcd.c    |  26 +++++
>   drivers/scsi/ufs/ufshcd.h    |  18 ++++
>   6 files changed, 255 insertions(+)
>   create mode 100644 drivers/scsi/ufs/ufs-hwmon.c
> 
> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
> index 432df76e6318..565e8aa6319d 100644
> --- a/drivers/scsi/ufs/Kconfig
> +++ b/drivers/scsi/ufs/Kconfig
> @@ -199,3 +199,12 @@ config SCSI_UFS_FAULT_INJECTION
>   	help
>   	  Enable fault injection support in the UFS driver. This makes it easier
>   	  to test the UFS error handler and abort handler.
> +
> +config SCSI_UFS_HWMON
> +	bool "UFS  Temperature Notification"
> +	depends on SCSI_UFSHCD && HWMON
> +	help
> +	  This provides support for UFS hardware monitoring. If enabled,
> +	  a hardware monitoring device will be created for the UFS device.
> +
> +	  If unsure, say N.
> diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
> index c407da9b5171..966048875b50 100644
> --- a/drivers/scsi/ufs/Makefile
> +++ b/drivers/scsi/ufs/Makefile
> @@ -10,6 +10,7 @@ ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o
>   ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO)	+= ufshcd-crypto.o
>   ufshcd-core-$(CONFIG_SCSI_UFS_HPB)	+= ufshpb.o
>   ufshcd-core-$(CONFIG_SCSI_UFS_FAULT_INJECTION) += ufs-fault-injection.o
> +ufshcd-core-$(CONFIG_SCSI_UFS_HWMON) += ufs-hwmon.o
>   
>   obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.o
>   obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
> diff --git a/drivers/scsi/ufs/ufs-hwmon.c b/drivers/scsi/ufs/ufs-hwmon.c
> new file mode 100644
> index 000000000000..390748a9d547
> --- /dev/null
> +++ b/drivers/scsi/ufs/ufs-hwmon.c
> @@ -0,0 +1,194 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * UFS hardware monitoring support
> + * Copyright (c) 2021, Western Digital Corporation
> + */
> +
> +#include <linux/hwmon.h>
> +#include <linux/units.h>
> +
> +#include "ufshcd.h"
> +
> +struct ufs_hwmon_data {
> +	struct ufs_hba *hba;
> +	u8 mask;
> +};
> +
> +static bool ufs_read_temp_enable(struct ufs_hba *hba, u8 mask)
> +{
> +	u32 ee_mask;
> +
> +	if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
> +			      &ee_mask))
> +		return false;

That should probably return the error code from ufshcd_query_attr(). I don't see a good reason
to ignore it.

> +
> +	return (mask & ee_mask & MASK_EE_TOO_HIGH_TEMP) || (mask & ee_mask & MASK_EE_TOO_LOW_TEMP);
> +}
> +
> +static int ufs_get_temp(struct ufs_hba *hba, enum attr_idn idn, long *val)
> +{
> +	u32 value;
> +
> +	if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, idn, 0, 0, &value))
> +		return -EINVAL;

ufshcd_query_attr() already returns a valid Linux error code. It should be returned
and not be overwritten. Besides, -EINVAL is wrong in most cases. It is only an acceptable
error code if parameters passed to ufshcd_query_attr() are wrong, which is surely not
the case here.

> +
> +	if (value == 0)
> +		return -EINVAL;

As mentioned in my other response, this is expected if the sensor is disabled, and thus
should return -ENODATA.

> +
> +	*val = ((long)value - 80) * MILLIDEGREE_PER_DEGREE;
> +	return 0;
> +}
> +
> +static int ufs_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
> +			  long *val)
> +{
> +	struct ufs_hwmon_data *data = dev_get_drvdata(dev);
> +	struct ufs_hba *hba = data->hba;
> +	int err = 0;
> +
> +	if (type != hwmon_temp)
> +		return 0;
> +
> +	down(&hba->host_sem);
> +
> +	if (!ufshcd_is_user_access_allowed(hba)) {
> +		up(&hba->host_sem);
> +		return -EBUSY;
> +	}
> +
> +	ufshcd_rpm_get_sync(hba);
> +
> +	switch (attr) {
> +	case hwmon_temp_enable:
> +		*val = ufs_read_temp_enable(hba, data->mask);
> +
> +		break;
> +	case hwmon_temp_crit:
> +		err = ufs_get_temp(hba, QUERY_ATTR_IDN_HIGH_TEMP_BOUND, val);
> +
> +		break;
> +	case hwmon_temp_lcrit:
> +		err = ufs_get_temp(hba, QUERY_ATTR_IDN_LOW_TEMP_BOUND, val);
> +
> +		break;
> +	case hwmon_temp_input:
> +		err = ufs_get_temp(hba, QUERY_ATTR_IDN_CASE_ROUGH_TEMP, val);
> +
> +		break;
> +	default:
> +		err = -EOPNOTSUPP;
> +
> +		break;
> +	}
> +
> +	ufshcd_rpm_put_sync(hba);
> +
> +	up(&hba->host_sem);
> +
> +	return err;
> +}
> +
> +static int ufs_hwmon_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
> +			   long val)
> +{
> +	struct ufs_hwmon_data *data = dev_get_drvdata(dev);
> +	struct ufs_hba *hba = data->hba;
> +	int err = 0;
> +
> +	if (attr != hwmon_temp_enable)
> +		return -EINVAL;
> +
> +	if (val != 0 && val != 1)
> +		return -EINVAL;
> +
> +	down(&hba->host_sem);
> +
> +	if (!ufshcd_is_user_access_allowed(hba)) {
> +		up(&hba->host_sem);
> +		return -EBUSY;
> +	}
> +
> +	ufshcd_rpm_get_sync(hba);
> +
> +	if (val == 1)
> +		err = ufshcd_update_ee_usr_mask(hba, MASK_EE_URGENT_TEMP, 0);
> +	else
> +		err = ufshcd_update_ee_usr_mask(hba, 0, MASK_EE_URGENT_TEMP);
> +
> +	ufshcd_rpm_put_sync(hba);
> +
> +	up(&hba->host_sem);
> +
> +	return err;
> +}
> +
> +static umode_t ufs_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
> +				    int channel)
> +{
> +	if (type != hwmon_temp)
> +		return 0;
> +
> +	switch (attr) {
> +	case hwmon_temp_enable:
> +		return 0644;
> +	case hwmon_temp_crit:
> +	case hwmon_temp_lcrit:
> +	case hwmon_temp_input:
> +		return 0444;
> +	default:
> +		break;
> +	}
> +	return 0;
> +}
> +
> +static const struct hwmon_channel_info *ufs_hwmon_info[] = {
> +	HWMON_CHANNEL_INFO(temp, HWMON_T_ENABLE | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LCRIT),
> +	NULL
> +};
> +
> +static const struct hwmon_ops ufs_hwmon_ops = {
> +	.is_visible	= ufs_hwmon_is_visible,
> +	.read		= ufs_hwmon_read,
> +	.write		= ufs_hwmon_write,
> +};
> +
> +static const struct hwmon_chip_info ufs_hwmon_hba_info = {
> +	.ops	= &ufs_hwmon_ops,
> +	.info	= ufs_hwmon_info,
> +};
> +
> +void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask)
> +{
> +	struct device *dev = hba->dev;
> +	struct ufs_hwmon_data *data;
> +	struct device *hwmon;
> +
> +	data = kzalloc(sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return;
> +
> +	data->hba = hba;
> +	data->mask = mask;
> +
> +	hwmon = hwmon_device_register_with_info(dev, "ufs", data, &ufs_hwmon_hba_info, NULL);
> +	if (IS_ERR(hwmon)) {
> +		dev_warn(dev, "Failed to instantiate hwmon device\n");
> +		kfree(data);
> +		return;
> +	}
> +
> +	hba->hwmon_device = hwmon;
> +}
> +
> +void ufs_hwmon_remove(struct ufs_hba *hba)
> +{
> +	struct ufs_hwmon_data *data;
> +
> +	if (!hba->hwmon_device)
> +		return;
> +
> +	data = dev_get_drvdata(hba->hwmon_device);
> +	hwmon_device_unregister(hba->hwmon_device);
> +	hba->hwmon_device = NULL;
> +	kfree(data);
> +}
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index 8c6b38b1b142..0bfdca3e648e 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -152,6 +152,9 @@ enum attr_idn {
>   	QUERY_ATTR_IDN_PSA_STATE		= 0x15,
>   	QUERY_ATTR_IDN_PSA_DATA_SIZE		= 0x16,
>   	QUERY_ATTR_IDN_REF_CLK_GATING_WAIT_TIME	= 0x17,
> +	QUERY_ATTR_IDN_CASE_ROUGH_TEMP          = 0x18,
> +	QUERY_ATTR_IDN_HIGH_TEMP_BOUND          = 0x19,
> +	QUERY_ATTR_IDN_LOW_TEMP_BOUND           = 0x1A,
>   	QUERY_ATTR_IDN_WB_FLUSH_STATUS	        = 0x1C,
>   	QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE       = 0x1D,
>   	QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST    = 0x1E,
> @@ -338,6 +341,9 @@ enum {
>   
>   /* Possible values for dExtendedUFSFeaturesSupport */
>   enum {
> +	UFS_DEV_LOW_TEMP_NOTIF		= BIT(4),
> +	UFS_DEV_HIGH_TEMP_NOTIF		= BIT(5),
> +	UFS_DEV_EXT_TEMP_NOTIF		= BIT(6),
>   	UFS_DEV_HPB_SUPPORT		= BIT(7),
>   	UFS_DEV_WRITE_BOOSTER_SUP	= BIT(8),
>   };
> @@ -370,6 +376,7 @@ enum {
>   	MASK_EE_WRITEBOOSTER_EVENT	= BIT(5),
>   	MASK_EE_PERFORMANCE_THROTTLING	= BIT(6),
>   };
> +#define MASK_EE_URGENT_TEMP (MASK_EE_TOO_HIGH_TEMP | MASK_EE_TOO_LOW_TEMP)
>   
>   /* Background operation status */
>   enum bkops_status {
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 67889d74761c..cb20720c5deb 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7469,6 +7469,29 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
>   	hba->caps &= ~UFSHCD_CAP_WB_EN;
>   }
>   
> +static void ufshcd_temp_notif_probe(struct ufs_hba *hba, u8 *desc_buf)
> +{
> +	struct ufs_dev_info *dev_info = &hba->dev_info;
> +	u32 ext_ufs_feature;
> +	u8 mask = 0;
> +
> +	if (!(hba->caps & UFSHCD_CAP_TEMP_NOTIF) || dev_info->wspecversion < 0x300)
> +		return;
> +
> +	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
> +
> +	if (ext_ufs_feature & UFS_DEV_LOW_TEMP_NOTIF)
> +		mask |= MASK_EE_TOO_LOW_TEMP;
> +
> +	if (ext_ufs_feature & UFS_DEV_HIGH_TEMP_NOTIF)
> +		mask |= MASK_EE_TOO_HIGH_TEMP;
> +
> +	if (mask) {
> +		ufshcd_enable_ee(hba, mask);
> +		ufs_hwmon_probe(hba, mask);
> +	}
> +}
> +
>   void ufshcd_fixup_dev_quirks(struct ufs_hba *hba, struct ufs_dev_fix *fixups)
>   {
>   	struct ufs_dev_fix *f;
> @@ -7564,6 +7587,8 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
>   
>   	ufshcd_wb_probe(hba, desc_buf);
>   
> +	ufshcd_temp_notif_probe(hba, desc_buf);
> +
>   	/*
>   	 * ufshcd_read_string_desc returns size of the string
>   	 * reset the error value
> @@ -9408,6 +9433,7 @@ void ufshcd_remove(struct ufs_hba *hba)
>   {
>   	if (hba->sdev_ufs_device)
>   		ufshcd_rpm_get_sync(hba);
> +	ufs_hwmon_remove(hba);
>   	ufs_bsg_remove(hba);
>   	ufshpb_remove(hba);
>   	ufs_sysfs_remove_nodes(hba->dev);
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 4723f27a55d1..798a408d71e5 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -653,6 +653,12 @@ enum ufshcd_caps {
>   	 * in order to exit DeepSleep state.
>   	 */
>   	UFSHCD_CAP_DEEPSLEEP				= 1 << 10,
> +
> +	/*
> +	 * This capability allows the host controller driver to use temperature
> +	 * notification if it is supported by the UFS device.
> +	 */
> +	UFSHCD_CAP_TEMP_NOTIF				= 1 << 11,
>   };
>   
>   struct ufs_hba_variant_params {
> @@ -789,6 +795,10 @@ struct ufs_hba {
>   	struct scsi_device *sdev_ufs_device;
>   	struct scsi_device *sdev_rpmb;
>   
> +#ifdef CONFIG_SCSI_UFS_HWMON
> +	struct device *hwmon_device;
> +#endif
> +
>   	enum ufs_dev_pwr_mode curr_dev_pwr_mode;
>   	enum uic_link_state uic_link_state;
>   	/* Desired UFS power management level during runtime PM */
> @@ -1050,6 +1060,14 @@ static inline u8 ufshcd_wb_get_query_index(struct ufs_hba *hba)
>   	return 0;
>   }
>   
> +#ifdef CONFIG_SCSI_UFS_HWMON
> +void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask);
> +void ufs_hwmon_remove(struct ufs_hba *hba);
> +#else
> +static inline void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask) {}
> +static inline void ufs_hwmon_remove(struct ufs_hba *hba) {}
> +#endif
> +
>   #ifdef CONFIG_PM
>   extern int ufshcd_runtime_suspend(struct device *dev);
>   extern int ufshcd_runtime_resume(struct device *dev);
>
Avri Altman Sept. 13, 2021, 3:29 p.m. UTC | #2
> > +
> > +static bool ufs_read_temp_enable(struct ufs_hba *hba, u8 mask) {
> > +     u32 ee_mask;
> > +
> > +     if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
> QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
> > +                           &ee_mask))
> > +             return false;
> 
> That should probably return the error code from ufshcd_query_attr(). I don't
> see a good reason to ignore it.
Done.

> 
> > +
> > +     return (mask & ee_mask & MASK_EE_TOO_HIGH_TEMP) || (mask &
> > +ee_mask & MASK_EE_TOO_LOW_TEMP); }
> > +
> > +static int ufs_get_temp(struct ufs_hba *hba, enum attr_idn idn, long
> > +*val) {
> > +     u32 value;
> > +
> > +     if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, idn, 0,
> 0, &value))
> > +             return -EINVAL;
> 
> ufshcd_query_attr() already returns a valid Linux error code. It should be
> returned and not be overwritten. Besides, -EINVAL is wrong in most cases. It
> is only an acceptable error code if parameters passed to ufshcd_query_attr()
> are wrong, which is surely not the case here.
Done.

> 
> > +
> > +     if (value == 0)
> > +             return -EINVAL;
> 
> As mentioned in my other response, this is expected if the sensor is
> disabled, and thus should return -ENODATA.
Done.

Thanks,
Avri
diff mbox series

Patch

diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index 432df76e6318..565e8aa6319d 100644
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -199,3 +199,12 @@  config SCSI_UFS_FAULT_INJECTION
 	help
 	  Enable fault injection support in the UFS driver. This makes it easier
 	  to test the UFS error handler and abort handler.
+
+config SCSI_UFS_HWMON
+	bool "UFS  Temperature Notification"
+	depends on SCSI_UFSHCD && HWMON
+	help
+	  This provides support for UFS hardware monitoring. If enabled,
+	  a hardware monitoring device will be created for the UFS device.
+
+	  If unsure, say N.
diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
index c407da9b5171..966048875b50 100644
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -10,6 +10,7 @@  ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o
 ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO)	+= ufshcd-crypto.o
 ufshcd-core-$(CONFIG_SCSI_UFS_HPB)	+= ufshpb.o
 ufshcd-core-$(CONFIG_SCSI_UFS_FAULT_INJECTION) += ufs-fault-injection.o
+ufshcd-core-$(CONFIG_SCSI_UFS_HWMON) += ufs-hwmon.o
 
 obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.o
 obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
diff --git a/drivers/scsi/ufs/ufs-hwmon.c b/drivers/scsi/ufs/ufs-hwmon.c
new file mode 100644
index 000000000000..390748a9d547
--- /dev/null
+++ b/drivers/scsi/ufs/ufs-hwmon.c
@@ -0,0 +1,194 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * UFS hardware monitoring support
+ * Copyright (c) 2021, Western Digital Corporation
+ */
+
+#include <linux/hwmon.h>
+#include <linux/units.h>
+
+#include "ufshcd.h"
+
+struct ufs_hwmon_data {
+	struct ufs_hba *hba;
+	u8 mask;
+};
+
+static bool ufs_read_temp_enable(struct ufs_hba *hba, u8 mask)
+{
+	u32 ee_mask;
+
+	if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, QUERY_ATTR_IDN_EE_CONTROL, 0, 0,
+			      &ee_mask))
+		return false;
+
+	return (mask & ee_mask & MASK_EE_TOO_HIGH_TEMP) || (mask & ee_mask & MASK_EE_TOO_LOW_TEMP);
+}
+
+static int ufs_get_temp(struct ufs_hba *hba, enum attr_idn idn, long *val)
+{
+	u32 value;
+
+	if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, idn, 0, 0, &value))
+		return -EINVAL;
+
+	if (value == 0)
+		return -EINVAL;
+
+	*val = ((long)value - 80) * MILLIDEGREE_PER_DEGREE;
+	return 0;
+}
+
+static int ufs_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+			  long *val)
+{
+	struct ufs_hwmon_data *data = dev_get_drvdata(dev);
+	struct ufs_hba *hba = data->hba;
+	int err = 0;
+
+	if (type != hwmon_temp)
+		return 0;
+
+	down(&hba->host_sem);
+
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		up(&hba->host_sem);
+		return -EBUSY;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+
+	switch (attr) {
+	case hwmon_temp_enable:
+		*val = ufs_read_temp_enable(hba, data->mask);
+
+		break;
+	case hwmon_temp_crit:
+		err = ufs_get_temp(hba, QUERY_ATTR_IDN_HIGH_TEMP_BOUND, val);
+
+		break;
+	case hwmon_temp_lcrit:
+		err = ufs_get_temp(hba, QUERY_ATTR_IDN_LOW_TEMP_BOUND, val);
+
+		break;
+	case hwmon_temp_input:
+		err = ufs_get_temp(hba, QUERY_ATTR_IDN_CASE_ROUGH_TEMP, val);
+
+		break;
+	default:
+		err = -EOPNOTSUPP;
+
+		break;
+	}
+
+	ufshcd_rpm_put_sync(hba);
+
+	up(&hba->host_sem);
+
+	return err;
+}
+
+static int ufs_hwmon_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+			   long val)
+{
+	struct ufs_hwmon_data *data = dev_get_drvdata(dev);
+	struct ufs_hba *hba = data->hba;
+	int err = 0;
+
+	if (attr != hwmon_temp_enable)
+		return -EINVAL;
+
+	if (val != 0 && val != 1)
+		return -EINVAL;
+
+	down(&hba->host_sem);
+
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		up(&hba->host_sem);
+		return -EBUSY;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+
+	if (val == 1)
+		err = ufshcd_update_ee_usr_mask(hba, MASK_EE_URGENT_TEMP, 0);
+	else
+		err = ufshcd_update_ee_usr_mask(hba, 0, MASK_EE_URGENT_TEMP);
+
+	ufshcd_rpm_put_sync(hba);
+
+	up(&hba->host_sem);
+
+	return err;
+}
+
+static umode_t ufs_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
+				    int channel)
+{
+	if (type != hwmon_temp)
+		return 0;
+
+	switch (attr) {
+	case hwmon_temp_enable:
+		return 0644;
+	case hwmon_temp_crit:
+	case hwmon_temp_lcrit:
+	case hwmon_temp_input:
+		return 0444;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct hwmon_channel_info *ufs_hwmon_info[] = {
+	HWMON_CHANNEL_INFO(temp, HWMON_T_ENABLE | HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LCRIT),
+	NULL
+};
+
+static const struct hwmon_ops ufs_hwmon_ops = {
+	.is_visible	= ufs_hwmon_is_visible,
+	.read		= ufs_hwmon_read,
+	.write		= ufs_hwmon_write,
+};
+
+static const struct hwmon_chip_info ufs_hwmon_hba_info = {
+	.ops	= &ufs_hwmon_ops,
+	.info	= ufs_hwmon_info,
+};
+
+void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask)
+{
+	struct device *dev = hba->dev;
+	struct ufs_hwmon_data *data;
+	struct device *hwmon;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return;
+
+	data->hba = hba;
+	data->mask = mask;
+
+	hwmon = hwmon_device_register_with_info(dev, "ufs", data, &ufs_hwmon_hba_info, NULL);
+	if (IS_ERR(hwmon)) {
+		dev_warn(dev, "Failed to instantiate hwmon device\n");
+		kfree(data);
+		return;
+	}
+
+	hba->hwmon_device = hwmon;
+}
+
+void ufs_hwmon_remove(struct ufs_hba *hba)
+{
+	struct ufs_hwmon_data *data;
+
+	if (!hba->hwmon_device)
+		return;
+
+	data = dev_get_drvdata(hba->hwmon_device);
+	hwmon_device_unregister(hba->hwmon_device);
+	hba->hwmon_device = NULL;
+	kfree(data);
+}
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 8c6b38b1b142..0bfdca3e648e 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -152,6 +152,9 @@  enum attr_idn {
 	QUERY_ATTR_IDN_PSA_STATE		= 0x15,
 	QUERY_ATTR_IDN_PSA_DATA_SIZE		= 0x16,
 	QUERY_ATTR_IDN_REF_CLK_GATING_WAIT_TIME	= 0x17,
+	QUERY_ATTR_IDN_CASE_ROUGH_TEMP          = 0x18,
+	QUERY_ATTR_IDN_HIGH_TEMP_BOUND          = 0x19,
+	QUERY_ATTR_IDN_LOW_TEMP_BOUND           = 0x1A,
 	QUERY_ATTR_IDN_WB_FLUSH_STATUS	        = 0x1C,
 	QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE       = 0x1D,
 	QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST    = 0x1E,
@@ -338,6 +341,9 @@  enum {
 
 /* Possible values for dExtendedUFSFeaturesSupport */
 enum {
+	UFS_DEV_LOW_TEMP_NOTIF		= BIT(4),
+	UFS_DEV_HIGH_TEMP_NOTIF		= BIT(5),
+	UFS_DEV_EXT_TEMP_NOTIF		= BIT(6),
 	UFS_DEV_HPB_SUPPORT		= BIT(7),
 	UFS_DEV_WRITE_BOOSTER_SUP	= BIT(8),
 };
@@ -370,6 +376,7 @@  enum {
 	MASK_EE_WRITEBOOSTER_EVENT	= BIT(5),
 	MASK_EE_PERFORMANCE_THROTTLING	= BIT(6),
 };
+#define MASK_EE_URGENT_TEMP (MASK_EE_TOO_HIGH_TEMP | MASK_EE_TOO_LOW_TEMP)
 
 /* Background operation status */
 enum bkops_status {
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 67889d74761c..cb20720c5deb 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7469,6 +7469,29 @@  static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
 	hba->caps &= ~UFSHCD_CAP_WB_EN;
 }
 
+static void ufshcd_temp_notif_probe(struct ufs_hba *hba, u8 *desc_buf)
+{
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+	u32 ext_ufs_feature;
+	u8 mask = 0;
+
+	if (!(hba->caps & UFSHCD_CAP_TEMP_NOTIF) || dev_info->wspecversion < 0x300)
+		return;
+
+	ext_ufs_feature = get_unaligned_be32(desc_buf + DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+
+	if (ext_ufs_feature & UFS_DEV_LOW_TEMP_NOTIF)
+		mask |= MASK_EE_TOO_LOW_TEMP;
+
+	if (ext_ufs_feature & UFS_DEV_HIGH_TEMP_NOTIF)
+		mask |= MASK_EE_TOO_HIGH_TEMP;
+
+	if (mask) {
+		ufshcd_enable_ee(hba, mask);
+		ufs_hwmon_probe(hba, mask);
+	}
+}
+
 void ufshcd_fixup_dev_quirks(struct ufs_hba *hba, struct ufs_dev_fix *fixups)
 {
 	struct ufs_dev_fix *f;
@@ -7564,6 +7587,8 @@  static int ufs_get_device_desc(struct ufs_hba *hba)
 
 	ufshcd_wb_probe(hba, desc_buf);
 
+	ufshcd_temp_notif_probe(hba, desc_buf);
+
 	/*
 	 * ufshcd_read_string_desc returns size of the string
 	 * reset the error value
@@ -9408,6 +9433,7 @@  void ufshcd_remove(struct ufs_hba *hba)
 {
 	if (hba->sdev_ufs_device)
 		ufshcd_rpm_get_sync(hba);
+	ufs_hwmon_remove(hba);
 	ufs_bsg_remove(hba);
 	ufshpb_remove(hba);
 	ufs_sysfs_remove_nodes(hba->dev);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 4723f27a55d1..798a408d71e5 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -653,6 +653,12 @@  enum ufshcd_caps {
 	 * in order to exit DeepSleep state.
 	 */
 	UFSHCD_CAP_DEEPSLEEP				= 1 << 10,
+
+	/*
+	 * This capability allows the host controller driver to use temperature
+	 * notification if it is supported by the UFS device.
+	 */
+	UFSHCD_CAP_TEMP_NOTIF				= 1 << 11,
 };
 
 struct ufs_hba_variant_params {
@@ -789,6 +795,10 @@  struct ufs_hba {
 	struct scsi_device *sdev_ufs_device;
 	struct scsi_device *sdev_rpmb;
 
+#ifdef CONFIG_SCSI_UFS_HWMON
+	struct device *hwmon_device;
+#endif
+
 	enum ufs_dev_pwr_mode curr_dev_pwr_mode;
 	enum uic_link_state uic_link_state;
 	/* Desired UFS power management level during runtime PM */
@@ -1050,6 +1060,14 @@  static inline u8 ufshcd_wb_get_query_index(struct ufs_hba *hba)
 	return 0;
 }
 
+#ifdef CONFIG_SCSI_UFS_HWMON
+void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask);
+void ufs_hwmon_remove(struct ufs_hba *hba);
+#else
+static inline void ufs_hwmon_probe(struct ufs_hba *hba, u8 mask) {}
+static inline void ufs_hwmon_remove(struct ufs_hba *hba) {}
+#endif
+
 #ifdef CONFIG_PM
 extern int ufshcd_runtime_suspend(struct device *dev);
 extern int ufshcd_runtime_resume(struct device *dev);