Added cxl v2.1 format region label deletion routine. This function is
used to delete region label from LSA

Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
---
 drivers/nvdimm/label.c          | 77 ++++++++++++++++++++++++++++++---
 drivers/nvdimm/label.h          |  6 +++
 drivers/nvdimm/namespace_devs.c | 12 +++++
 drivers/nvdimm/nd.h             |  9 ++++
 include/linux/libnvdimm.h       |  1 +
 5 files changed, 100 insertions(+), 5 deletions(-)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 94f2d0ba7aca..be18278d6cea 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -1044,7 +1044,8 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
 	return max(num_labels, old_num_labels);
 }
 
-static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
+static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid,
+		enum label_type ltype)
 {
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 	struct nd_label_ent *label_ent, *e;
@@ -1068,8 +1069,23 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
 		if (!nd_label)
 			continue;
 		active++;
-		if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
-			continue;
+
+		switch (ltype) {
+		case NS_LABEL_TYPE:
+			if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
+				continue;
+
+			break;
+		case RG_LABEL_TYPE:
+			if (!rgl_uuid_equal(&nd_label->rg_label, uuid))
+				continue;
+
+			break;
+		default:
+			dev_err(ndd->dev, "Invalid label type\n");
+			return 0;
+		}
+
 		active--;
 		slot = to_slot(ndd, nd_label);
 		nd_label_free_slot(ndd, slot);
@@ -1079,7 +1095,7 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
 	}
 	list_splice_tail_init(&list, &nd_mapping->labels);
 
-	if (active == 0) {
+	if ((ltype == NS_LABEL_TYPE) && (active == 0)) {
 		nd_mapping_free_labels(nd_mapping);
 		dev_dbg(ndd->dev, "no more active labels\n");
 	}
@@ -1101,7 +1117,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
 		int count = 0;
 
 		if (size == 0) {
-			rc = del_labels(nd_mapping, nspm->uuid);
+			rc = del_labels(nd_mapping, nspm->uuid,
+					NS_LABEL_TYPE);
 			if (rc)
 				return rc;
 			continue;
@@ -1268,6 +1285,56 @@ int nd_pmem_region_label_update(struct nd_region *nd_region)
 	return 0;
 }
 
+int nd_pmem_region_label_delete(struct nd_region *nd_region)
+{
+	int i, rc;
+	struct nd_interleave_set *nd_set = nd_region->nd_set;
+	struct nd_label_ent *label_ent;
+	int ns_region_cnt = 0;
+
+	for (i = 0; i < nd_region->ndr_mappings; i++) {
+		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+		/* Find non cxl format supported ndr_mappings */
+		if (!ndd->cxl) {
+			dev_info(&nd_region->dev, "Region label unsupported\n");
+			return -EINVAL;
+		}
+
+		/* Find if any NS label using this region */
+		mutex_lock(&nd_mapping->lock);
+		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
+			if (!label_ent->label)
+				continue;
+
+			/*
+			 * Check if any available NS labels has same
+			 * region_uuid in LSA
+			 */
+			if (nsl_region_uuid_equal(&label_ent->label->ns_label,
+						  &nd_set->uuid))
+				ns_region_cnt++;
+		}
+		mutex_unlock(&nd_mapping->lock);
+	}
+
+	if (ns_region_cnt) {
+		dev_dbg(&nd_region->dev, "Region/Namespace label in use\n");
+		return -EBUSY;
+	}
+
+	for (i = 0; i < nd_region->ndr_mappings; i++) {
+		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+		rc = del_labels(nd_mapping, &nd_set->uuid, RG_LABEL_TYPE);
+		if (rc)
+			return rc;
+	}
+
+	return 0;
+}
+
 int __init nd_label_init(void)
 {
 	WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 0f428695017d..cc14068511cf 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -30,6 +30,11 @@ enum {
 	ND_NSINDEX_INIT = 0x1,
 };
 
+enum label_type {
+	RG_LABEL_TYPE,
+	NS_LABEL_TYPE,
+};
+
 /**
  * struct nd_namespace_index - label set superblock
  * @sig: NAMESPACE_INDEX\0
@@ -235,4 +240,5 @@ struct nd_namespace_pmem;
 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
 		struct nd_namespace_pmem *nspm, resource_size_t size);
 int nd_pmem_region_label_update(struct nd_region *nd_region);
+int nd_pmem_region_label_delete(struct nd_region *nd_region);
 #endif /* __LABEL_H__ */
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 02ae8162566c..e5c2f78ca7dd 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -244,6 +244,18 @@ int nd_region_label_update(struct nd_region *nd_region)
 }
 EXPORT_SYMBOL_GPL(nd_region_label_update);
 
+int nd_region_label_delete(struct nd_region *nd_region)
+{
+	int rc;
+
+	nvdimm_bus_lock(&nd_region->dev);
+	rc = nd_pmem_region_label_delete(nd_region);
+	nvdimm_bus_unlock(&nd_region->dev);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(nd_region_label_delete);
+
 static int nd_namespace_label_update(struct nd_region *nd_region,
 		struct device *dev)
 {
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 15d94e3937f0..6585747154c2 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -322,6 +322,15 @@ static inline void nsl_set_region_uuid(struct nvdimm_drvdata *ndd,
 		export_uuid(ns_label->cxl.region_uuid, uuid);
 }
 
+static inline bool nsl_region_uuid_equal(struct nd_namespace_label *ns_label,
+				  const uuid_t *uuid)
+{
+	uuid_t tmp;
+
+	import_uuid(&tmp, ns_label->cxl.region_uuid);
+	return uuid_equal(&tmp, uuid);
+}
+
 static inline bool rgl_uuid_equal(struct cxl_region_label *rg_label,
 				  const uuid_t *uuid)
 {
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index b06bd45373f4..b2e16914ab52 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -310,6 +310,7 @@ int nvdimm_has_cache(struct nd_region *nd_region);
 int nvdimm_in_overwrite(struct nvdimm *nvdimm);
 bool is_nvdimm_sync(struct nd_region *nd_region);
 int nd_region_label_update(struct nd_region *nd_region);
+int nd_region_label_delete(struct nd_region *nd_region);
 
 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
 		unsigned int buf_len, int *cmd_rc)
-- 
2.34.1

On 7/30/25 5:11 AM, Neeraj Kumar wrote:
> Added cxl v2.1 format region label deletion routine. This function is
> used to delete region label from LSA
> 
> Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
> ---
>  drivers/nvdimm/label.c          | 77 ++++++++++++++++++++++++++++++---
>  drivers/nvdimm/label.h          |  6 +++
>  drivers/nvdimm/namespace_devs.c | 12 +++++
>  drivers/nvdimm/nd.h             |  9 ++++
>  include/linux/libnvdimm.h       |  1 +
>  5 files changed, 100 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 94f2d0ba7aca..be18278d6cea 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -1044,7 +1044,8 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
>  	return max(num_labels, old_num_labels);
>  }
>  
> -static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
> +static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid,
> +		enum label_type ltype)
>  {
>  	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>  	struct nd_label_ent *label_ent, *e;
> @@ -1068,8 +1069,23 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>  		if (!nd_label)
>  			continue;
>  		active++;
> -		if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
> -			continue;
> +
> +		switch (ltype) {
> +		case NS_LABEL_TYPE:
> +			if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
> +				continue;
> +
> +			break;
> +		case RG_LABEL_TYPE:
> +			if (!rgl_uuid_equal(&nd_label->rg_label, uuid))
> +				continue;
> +
> +			break;
> +		default:
> +			dev_err(ndd->dev, "Invalid label type\n");
> +			return 0;
> +		}
> +
>  		active--;
>  		slot = to_slot(ndd, nd_label);
>  		nd_label_free_slot(ndd, slot);
> @@ -1079,7 +1095,7 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>  	}
>  	list_splice_tail_init(&list, &nd_mapping->labels);
>  
> -	if (active == 0) {
> +	if ((ltype == NS_LABEL_TYPE) && (active == 0)) {
>  		nd_mapping_free_labels(nd_mapping);
>  		dev_dbg(ndd->dev, "no more active labels\n");
>  	}
> @@ -1101,7 +1117,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
>  		int count = 0;
>  
>  		if (size == 0) {
> -			rc = del_labels(nd_mapping, nspm->uuid);
> +			rc = del_labels(nd_mapping, nspm->uuid,
> +					NS_LABEL_TYPE);
>  			if (rc)
>  				return rc;
>  			continue;
> @@ -1268,6 +1285,56 @@ int nd_pmem_region_label_update(struct nd_region *nd_region)
>  	return 0;
>  }
>  
> +int nd_pmem_region_label_delete(struct nd_region *nd_region)
> +{
> +	int i, rc;
> +	struct nd_interleave_set *nd_set = nd_region->nd_set;
> +	struct nd_label_ent *label_ent;
> +	int ns_region_cnt = 0;

reverse xmas tree pls

> +
> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
> +		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
> +
> +		/* Find non cxl format supported ndr_mappings */
> +		if (!ndd->cxl) {
> +			dev_info(&nd_region->dev, "Region label unsupported\n");
> +			return -EINVAL;
> +		}
> +
> +		/* Find if any NS label using this region */
> +		mutex_lock(&nd_mapping->lock);
> +		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
> +			if (!label_ent->label)
> +				continue;
> +
> +			/*
> +			 * Check if any available NS labels has same
> +			 * region_uuid in LSA
> +			 */
> +			if (nsl_region_uuid_equal(&label_ent->label->ns_label,
> +						  &nd_set->uuid))
> +				ns_region_cnt++;
> +		}
> +		mutex_unlock(&nd_mapping->lock);
> +	}
> +
> +	if (ns_region_cnt) {
> +		dev_dbg(&nd_region->dev, "Region/Namespace label in use\n");
> +		return -EBUSY;
> +	}
> +
> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
> +
> +		rc = del_labels(nd_mapping, &nd_set->uuid, RG_LABEL_TYPE);
> +		if (rc)
> +			return rc;
> +	}
> +
> +	return 0;
> +}
> +
>  int __init nd_label_init(void)
>  {
>  	WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
> diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
> index 0f428695017d..cc14068511cf 100644
> --- a/drivers/nvdimm/label.h
> +++ b/drivers/nvdimm/label.h
> @@ -30,6 +30,11 @@ enum {
>  	ND_NSINDEX_INIT = 0x1,
>  };
>  
> +enum label_type {
> +	RG_LABEL_TYPE,

REGION_LABEL_TYPE preferred

> +	NS_LABEL_TYPE,
> +};
> +
>  /**
>   * struct nd_namespace_index - label set superblock
>   * @sig: NAMESPACE_INDEX\0
> @@ -235,4 +240,5 @@ struct nd_namespace_pmem;
>  int nd_pmem_namespace_label_update(struct nd_region *nd_region,
>  		struct nd_namespace_pmem *nspm, resource_size_t size);
>  int nd_pmem_region_label_update(struct nd_region *nd_region);
> +int nd_pmem_region_label_delete(struct nd_region *nd_region);
>  #endif /* __LABEL_H__ */
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 02ae8162566c..e5c2f78ca7dd 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -244,6 +244,18 @@ int nd_region_label_update(struct nd_region *nd_region)
>  }
>  EXPORT_SYMBOL_GPL(nd_region_label_update);
>  
> +int nd_region_label_delete(struct nd_region *nd_region)
> +{
> +	int rc;
> +
> +	nvdimm_bus_lock(&nd_region->dev);
> +	rc = nd_pmem_region_label_delete(nd_region);
> +	nvdimm_bus_unlock(&nd_region->dev);
> +
> +	return rc;
> +}
> +EXPORT_SYMBOL_GPL(nd_region_label_delete);
> +
>  static int nd_namespace_label_update(struct nd_region *nd_region,
>  		struct device *dev)
>  {
> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> index 15d94e3937f0..6585747154c2 100644
> --- a/drivers/nvdimm/nd.h
> +++ b/drivers/nvdimm/nd.h
> @@ -322,6 +322,15 @@ static inline void nsl_set_region_uuid(struct nvdimm_drvdata *ndd,
>  		export_uuid(ns_label->cxl.region_uuid, uuid);
>  }
>  
> +static inline bool nsl_region_uuid_equal(struct nd_namespace_label *ns_label,
> +				  const uuid_t *uuid)
> +{
> +	uuid_t tmp;

s/tmp/uuid/

> +
> +	import_uuid(&tmp, ns_label->cxl.region_uuid);
> +	return uuid_equal(&tmp, uuid);
> +}
> +
>  static inline bool rgl_uuid_equal(struct cxl_region_label *rg_label,
>  				  const uuid_t *uuid)
>  {
> diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
> index b06bd45373f4..b2e16914ab52 100644
> --- a/include/linux/libnvdimm.h
> +++ b/include/linux/libnvdimm.h
> @@ -310,6 +310,7 @@ int nvdimm_has_cache(struct nd_region *nd_region);
>  int nvdimm_in_overwrite(struct nvdimm *nvdimm);
>  bool is_nvdimm_sync(struct nd_region *nd_region);
>  int nd_region_label_update(struct nd_region *nd_region);
> +int nd_region_label_delete(struct nd_region *nd_region);
>  
>  static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
>  		unsigned int buf_len, int *cmd_rc)

On 15/08/25 03:22PM, Dave Jiang wrote:
>
>
>On 7/30/25 5:11 AM, Neeraj Kumar wrote:
>> Added cxl v2.1 format region label deletion routine. This function is
>> used to delete region label from LSA
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
>> ---
>>  drivers/nvdimm/label.c          | 77 ++++++++++++++++++++++++++++++---
>>  drivers/nvdimm/label.h          |  6 +++
>>  drivers/nvdimm/namespace_devs.c | 12 +++++
>>  drivers/nvdimm/nd.h             |  9 ++++
>>  include/linux/libnvdimm.h       |  1 +
>>  5 files changed, 100 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
>> index 94f2d0ba7aca..be18278d6cea 100644
>> --- a/drivers/nvdimm/label.c
>> +++ b/drivers/nvdimm/label.c
>> @@ -1044,7 +1044,8 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
>>  	return max(num_labels, old_num_labels);
>>  }
>>
>> -static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>> +static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid,
>> +		enum label_type ltype)
>>  {
>>  	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>>  	struct nd_label_ent *label_ent, *e;
>> @@ -1068,8 +1069,23 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>>  		if (!nd_label)
>>  			continue;
>>  		active++;
>> -		if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
>> -			continue;
>> +
>> +		switch (ltype) {
>> +		case NS_LABEL_TYPE:
>> +			if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
>> +				continue;
>> +
>> +			break;
>> +		case RG_LABEL_TYPE:
>> +			if (!rgl_uuid_equal(&nd_label->rg_label, uuid))
>> +				continue;
>> +
>> +			break;
>> +		default:
>> +			dev_err(ndd->dev, "Invalid label type\n");
>> +			return 0;
>> +		}
>> +
>>  		active--;
>>  		slot = to_slot(ndd, nd_label);
>>  		nd_label_free_slot(ndd, slot);
>> @@ -1079,7 +1095,7 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>>  	}
>>  	list_splice_tail_init(&list, &nd_mapping->labels);
>>
>> -	if (active == 0) {
>> +	if ((ltype == NS_LABEL_TYPE) && (active == 0)) {
>>  		nd_mapping_free_labels(nd_mapping);
>>  		dev_dbg(ndd->dev, "no more active labels\n");
>>  	}
>> @@ -1101,7 +1117,8 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
>>  		int count = 0;
>>
>>  		if (size == 0) {
>> -			rc = del_labels(nd_mapping, nspm->uuid);
>> +			rc = del_labels(nd_mapping, nspm->uuid,
>> +					NS_LABEL_TYPE);
>>  			if (rc)
>>  				return rc;
>>  			continue;
>> @@ -1268,6 +1285,56 @@ int nd_pmem_region_label_update(struct nd_region *nd_region)
>>  	return 0;
>>  }
>>
>> +int nd_pmem_region_label_delete(struct nd_region *nd_region)
>> +{
>> +	int i, rc;
>> +	struct nd_interleave_set *nd_set = nd_region->nd_set;
>> +	struct nd_label_ent *label_ent;
>> +	int ns_region_cnt = 0;
>
>reverse xmas tree pls

Sure Dave, I will arrange them in reverse xmas tree format.

>
>> +
>> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
>> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
>> +		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>> +
>> +		/* Find non cxl format supported ndr_mappings */
>> +		if (!ndd->cxl) {
>> +			dev_info(&nd_region->dev, "Region label unsupported\n");
>> +			return -EINVAL;
>> +		}
>> +
>> +		/* Find if any NS label using this region */
>> +		mutex_lock(&nd_mapping->lock);
>> +		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
>> +			if (!label_ent->label)
>> +				continue;
>> +
>> +			/*
>> +			 * Check if any available NS labels has same
>> +			 * region_uuid in LSA
>> +			 */
>> +			if (nsl_region_uuid_equal(&label_ent->label->ns_label,
>> +						  &nd_set->uuid))
>> +				ns_region_cnt++;
>> +		}
>> +		mutex_unlock(&nd_mapping->lock);
>> +	}
>> +
>> +	if (ns_region_cnt) {
>> +		dev_dbg(&nd_region->dev, "Region/Namespace label in use\n");
>> +		return -EBUSY;
>> +	}
>> +
>> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
>> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
>> +
>> +		rc = del_labels(nd_mapping, &nd_set->uuid, RG_LABEL_TYPE);
>> +		if (rc)
>> +			return rc;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>  int __init nd_label_init(void)
>>  {
>>  	WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
>> diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
>> index 0f428695017d..cc14068511cf 100644
>> --- a/drivers/nvdimm/label.h
>> +++ b/drivers/nvdimm/label.h
>> @@ -30,6 +30,11 @@ enum {
>>  	ND_NSINDEX_INIT = 0x1,
>>  };
>>
>> +enum label_type {
>> +	RG_LABEL_TYPE,
>
>REGION_LABEL_TYPE preferred

Sure, I will rename it as REGION_LABEL_TYPE

>
>> +	NS_LABEL_TYPE,
>> +};
>> +
>>  /**
>>   * struct nd_namespace_index - label set superblock
>>   * @sig: NAMESPACE_INDEX\0
>> @@ -235,4 +240,5 @@ struct nd_namespace_pmem;
>>  int nd_pmem_namespace_label_update(struct nd_region *nd_region,
>>  		struct nd_namespace_pmem *nspm, resource_size_t size);
>>  int nd_pmem_region_label_update(struct nd_region *nd_region);
>> +int nd_pmem_region_label_delete(struct nd_region *nd_region);
>>  #endif /* __LABEL_H__ */
>> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
>> index 02ae8162566c..e5c2f78ca7dd 100644
>> --- a/drivers/nvdimm/namespace_devs.c
>> +++ b/drivers/nvdimm/namespace_devs.c
>> @@ -244,6 +244,18 @@ int nd_region_label_update(struct nd_region *nd_region)
>>  }
>>  EXPORT_SYMBOL_GPL(nd_region_label_update);
>>
>> +int nd_region_label_delete(struct nd_region *nd_region)
>> +{
>> +	int rc;
>> +
>> +	nvdimm_bus_lock(&nd_region->dev);
>> +	rc = nd_pmem_region_label_delete(nd_region);
>> +	nvdimm_bus_unlock(&nd_region->dev);
>> +
>> +	return rc;
>> +}
>> +EXPORT_SYMBOL_GPL(nd_region_label_delete);
>> +
>>  static int nd_namespace_label_update(struct nd_region *nd_region,
>>  		struct device *dev)
>>  {
>> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
>> index 15d94e3937f0..6585747154c2 100644
>> --- a/drivers/nvdimm/nd.h
>> +++ b/drivers/nvdimm/nd.h
>> @@ -322,6 +322,15 @@ static inline void nsl_set_region_uuid(struct nvdimm_drvdata *ndd,
>>  		export_uuid(ns_label->cxl.region_uuid, uuid);
>>  }
>>
>> +static inline bool nsl_region_uuid_equal(struct nd_namespace_label *ns_label,
>> +				  const uuid_t *uuid)
>> +{
>> +	uuid_t tmp;
>
>s/tmp/uuid/

Sure, I will fix it in next patch-set


Regards,
Neeraj

On Wed, 30 Jul 2025 17:41:55 +0530
Neeraj Kumar <s.neeraj@samsung.com> wrote:

> Added cxl v2.1 format region label deletion routine. This function is
> used to delete region label from LSA
> 
> Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
> ---
>  drivers/nvdimm/label.c          | 77 ++++++++++++++++++++++++++++++---
>  drivers/nvdimm/label.h          |  6 +++
>  drivers/nvdimm/namespace_devs.c | 12 +++++
>  drivers/nvdimm/nd.h             |  9 ++++
>  include/linux/libnvdimm.h       |  1 +
>  5 files changed, 100 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 94f2d0ba7aca..be18278d6cea 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -1044,7 +1044,8 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
>  	return max(num_labels, old_num_labels);
>  }
>  
> -static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
> +static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid,
> +		enum label_type ltype)
>  {
>  	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>  	struct nd_label_ent *label_ent, *e;
> @@ -1068,8 +1069,23 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>  		if (!nd_label)
>  			continue;
>  		active++;
> -		if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
> -			continue;
> +
> +		switch (ltype) {
> +		case NS_LABEL_TYPE:
> +			if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
> +				continue;
> +
> +			break;
> +		case RG_LABEL_TYPE:
> +			if (!rgl_uuid_equal(&nd_label->rg_label, uuid))
> +				continue;
> +
> +			break;
> +		default:
> +			dev_err(ndd->dev, "Invalid label type\n");
> +			return 0;

Given you pass in an enum and both elements are covered by other cases
shouldn't need a default here.

> +		}
> +
>  		active--;
>  		slot = to_slot(ndd, nd_label);
>  		nd_label_free_slot(ndd, slot);



> @@ -1268,6 +1285,56 @@ int nd_pmem_region_label_update(struct nd_region *nd_region)
>  	return 0;
>  }
>  
> +int nd_pmem_region_label_delete(struct nd_region *nd_region)
> +{
> +	int i, rc;
> +	struct nd_interleave_set *nd_set = nd_region->nd_set;
> +	struct nd_label_ent *label_ent;
> +	int ns_region_cnt = 0;
> +
> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
> +		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
> +
> +		/* Find non cxl format supported ndr_mappings */
> +		if (!ndd->cxl) {
> +			dev_info(&nd_region->dev, "Region label unsupported\n");

I'd go with "Unsupported region label".  The other way around kind of implies
a deficiency in the code, whereas point here is that new stuff may be added to
the spec that we don't yet understand.

> +			return -EINVAL;
> +		}
> +
> +		/* Find if any NS label using this region */
> +		mutex_lock(&nd_mapping->lock);

I'd go for guard here probably as the scope will mean it gets unlocked
at end of this loop step.


		guard(mutex)(&nd_mapping->lock);
> +		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
> +			if (!label_ent->label)
> +				continue;
> +
> +			/*
> +			 * Check if any available NS labels has same
> +			 * region_uuid in LSA
> +			 */
> +			if (nsl_region_uuid_equal(&label_ent->label->ns_label,
> +						  &nd_set->uuid))
> +				ns_region_cnt++;
> +		}
> +		mutex_unlock(&nd_mapping->lock);
> +	}
> +
> +	if (ns_region_cnt) {
> +		dev_dbg(&nd_region->dev, "Region/Namespace label in use\n");
> +		return -EBUSY;
> +	}
> +
> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
> +
> +		rc = del_labels(nd_mapping, &nd_set->uuid, RG_LABEL_TYPE);
> +		if (rc)
> +			return rc;
> +	}
> +
> +	return 0;
> +}
> +
>  int __init nd_label_init(void)
>  {
>  	WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
>
> @@ -235,4 +240,5 @@ struct nd_namespace_pmem;
>  int nd_pmem_namespace_label_update(struct nd_region *nd_region,
>  		struct nd_namespace_pmem *nspm, resource_size_t size);
>  int nd_pmem_region_label_update(struct nd_region *nd_region);
> +int nd_pmem_region_label_delete(struct nd_region *nd_region);
>  #endif /* __LABEL_H__ */

On 13/08/25 03:53PM, Jonathan Cameron wrote:
>On Wed, 30 Jul 2025 17:41:55 +0530
>Neeraj Kumar <s.neeraj@samsung.com> wrote:
>
>> Added cxl v2.1 format region label deletion routine. This function is
>> used to delete region label from LSA
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
>> ---
>>  drivers/nvdimm/label.c          | 77 ++++++++++++++++++++++++++++++---
>>  drivers/nvdimm/label.h          |  6 +++
>>  drivers/nvdimm/namespace_devs.c | 12 +++++
>>  drivers/nvdimm/nd.h             |  9 ++++
>>  include/linux/libnvdimm.h       |  1 +
>>  5 files changed, 100 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
>> index 94f2d0ba7aca..be18278d6cea 100644
>> --- a/drivers/nvdimm/label.c
>> +++ b/drivers/nvdimm/label.c
>> @@ -1044,7 +1044,8 @@ static int init_labels(struct nd_mapping *nd_mapping, int num_labels)
>>  	return max(num_labels, old_num_labels);
>>  }
>>
>> -static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>> +static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid,
>> +		enum label_type ltype)
>>  {
>>  	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>>  	struct nd_label_ent *label_ent, *e;
>> @@ -1068,8 +1069,23 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>>  		if (!nd_label)
>>  			continue;
>>  		active++;
>> -		if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
>> -			continue;
>> +
>> +		switch (ltype) {
>> +		case NS_LABEL_TYPE:
>> +			if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
>> +				continue;
>> +
>> +			break;
>> +		case RG_LABEL_TYPE:
>> +			if (!rgl_uuid_equal(&nd_label->rg_label, uuid))
>> +				continue;
>> +
>> +			break;
>> +		default:
>> +			dev_err(ndd->dev, "Invalid label type\n");
>> +			return 0;
>
>Given you pass in an enum and both elements are covered by other cases
>shouldn't need a default here.

Thanks Jonathan, I will remove the default case in next patch-set

>
>> +		}
>> +
>>  		active--;
>>  		slot = to_slot(ndd, nd_label);
>>  		nd_label_free_slot(ndd, slot);
>
>
>
>> @@ -1268,6 +1285,56 @@ int nd_pmem_region_label_update(struct nd_region *nd_region)
>>  	return 0;
>>  }
>>
>> +int nd_pmem_region_label_delete(struct nd_region *nd_region)
>> +{
>> +	int i, rc;
>> +	struct nd_interleave_set *nd_set = nd_region->nd_set;
>> +	struct nd_label_ent *label_ent;
>> +	int ns_region_cnt = 0;
>> +
>> +	for (i = 0; i < nd_region->ndr_mappings; i++) {
>> +		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
>> +		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
>> +
>> +		/* Find non cxl format supported ndr_mappings */
>> +		if (!ndd->cxl) {
>> +			dev_info(&nd_region->dev, "Region label unsupported\n");
>
>I'd go with "Unsupported region label".  The other way around kind of implies
>a deficiency in the code, whereas point here is that new stuff may be added to
>the spec that we don't yet understand.

Sure, I will fix it in next patch-set

>
>> +			return -EINVAL;
>> +		}
>> +
>> +		/* Find if any NS label using this region */
>> +		mutex_lock(&nd_mapping->lock);
>
>I'd go for guard here probably as the scope will mean it gets unlocked
>at end of this loop step.
>
>
>		guard(mutex)(&nd_mapping->lock);

Sure Jonathan, I will fix it in next patch-set

Regards,
Neeraj