[v15,11/15] EDAC: Add memory repair control feature

diff --git a/Documentation/ABI/testing/sysfs-edac-memory-repair b/Documentation/ABI/testing/sysfs-edac-memory-repair
new file mode 100644
index 000000000000..393206b8d418
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-edac-memory-repair
@@ -0,0 +1,168 @@ 
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		The sysfs EDAC bus devices /<dev-name>/mem_repairX subdirectory
+		pertains to the memory media repair features control, such as
+		PPR (Post Package Repair), memory sparing etc, where<dev-name>
+		directory corresponds to a device registered with the EDAC
+		device driver for the memory repair features.
+		Memory sparing is a repair function that replaces a portion
+		of memory (spared memory) with a portion of functional memory.
+		Memory sparing has cacheline/row/bank/rank sparing
+		granularities.
+		The sysfs attributes nodes for a repair feature are only
+		present if the parent driver has implemented the corresponding
+		attr callback function and provided the necessary operations
+		to the EDAC device driver during registration.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/repair_type
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RO) Type of the repair instance. For eg. sPPR, hPPR, cacheline/
+		row/bank/rank memory sparing etc.
+		0 - Soft PPR(sPPR)
+		1 - Hard PPR(hPPR)
+		2 - Cacheline memory sparing
+		3 - Row memory sparing
+		4 - Bank memory sparing
+		5 - Rank memory sparing
+		All other values are reserved.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/persist_mode_avail
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RO) Persist repair modes supported in the device.
+		0 - Soft PPR(sPPR)/soft memory sparing (temporary repair).
+		1 - Hard PPR(hPPR)/hard memory sparing (permanent repair).
+		All other values are reserved.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/persist_mode
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Current persist repair mode.
+		0 - Soft PPR(sPPR)/soft memory sparing (temporary repair).
+		1 - Hard PPR(hPPR)/hard memory sparing (permanent repair).
+		All other values are reserved.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/dpa_support
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RO) True if supports DPA for a repair operation.
+		E.g. PPR, memory sparing.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/repair_safe_when_in_use
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RO) True if memory media is accessible and data is retained
+		during the memory repair operation.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/hpa
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) HPA (Host Physical Address) for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/dpa
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) DPA (Device Physical Address) for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/nibble_mask
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Nibble mask for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/bank_group
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Memory bank group for repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/bank
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Memory bank for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/rank
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Memory rank for repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/row
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Row for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/column
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Column for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/channel
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Channel for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/sub_channel
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(RW) Sub-channel for memory repair.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/query
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(WO) Query whether the repair operation is supported for the
+		memory attributes set. Return failure if resources are
+		not available to perform repair.
+		1 - issue query.
+		All other values are reserved.
+
+What:		/sys/bus/edac/devices/<dev-name>/mem_repairX/repair
+Date:		Jan 2025
+KernelVersion:	6.13
+Contact:	linux-edac@vger.kernel.org
+Description:
+		(WO) Start the memory repair operation for the memory attributes
+		set. Return failure if resources are not available to
+		perform repair.
+		1 - issue repair operation.
+		All other values are reserved.
+		In some states of system configuration (e.g. before address
+		decoders have been configured), memory devices (e.g. CXL)
+		may not have an active mapping in the main host address
+		physical address map. As such, the memory to repair must be
+		identified by a device specific physical addressing scheme
+		using a DPA. The DPA to use will be presented in related
+		error records.
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index b24c2c112d9c..d037bce88487 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -10,7 +10,7 @@  obj-$(CONFIG_EDAC)			:= edac_core.o
 
 edac_core-y	:= edac_mc.o edac_device.o edac_mc_sysfs.o
 edac_core-y	+= edac_module.o edac_device_sysfs.o wq.o
-edac_core-y	+= scrub.o ecs.o
+edac_core-y	+= scrub.o ecs.o mem_repair.o
 
 edac_core-$(CONFIG_EDAC_DEBUG)		+= debugfs.o
 
diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index bbf5b52a1ce1..9575b04a7454 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -576,6 +576,7 @@  static void edac_dev_release(struct device *dev)
 {
 	struct edac_dev_feat_ctx *ctx = container_of(dev, struct edac_dev_feat_ctx, dev);
 
+	kfree(ctx->mem_repair);
 	kfree(ctx->scrub);
 	kfree(ctx->dev.groups);
 	kfree(ctx);
@@ -610,6 +611,7 @@  int edac_dev_register(struct device *parent, char *name,
 		      const struct edac_dev_feature *ras_features)
 {
 	const struct attribute_group **ras_attr_groups;
+	int mem_repair_cnt = 0, mem_repair_inst = 0;
 	int scrub_cnt = 0, scrub_inst = 0;
 	struct edac_dev_data *dev_data;
 	struct edac_dev_feat_ctx *ctx;
@@ -626,6 +628,10 @@  int edac_dev_register(struct device *parent, char *name,
 			attr_gcnt++;
 			scrub_cnt++;
 			break;
+		case RAS_FEAT_MEM_REPAIR:
+			attr_gcnt++;
+			mem_repair_cnt++;
+			break;
 		case RAS_FEAT_ECS:
 			attr_gcnt += ras_features[feat].ecs_info.num_media_frus;
 			break;
@@ -652,6 +658,14 @@  int edac_dev_register(struct device *parent, char *name,
 		}
 	}
 
+	if (mem_repair_cnt) {
+		ctx->mem_repair = kcalloc(mem_repair_cnt, sizeof(*ctx->mem_repair), GFP_KERNEL);
+		if (!ctx->mem_repair) {
+			ret = -ENOMEM;
+			goto groups_free;
+		}
+	}
+
 	attr_gcnt = 0;
 	for (feat = 0; feat < num_features; feat++, ras_features++) {
 		switch (ras_features->ft_type) {
@@ -686,6 +700,23 @@  int edac_dev_register(struct device *parent, char *name,
 
 			attr_gcnt += ras_features->ecs_info.num_media_frus;
 			break;
+		case RAS_FEAT_MEM_REPAIR:
+			if (!ras_features->mem_repair_ops ||
+			    mem_repair_inst != ras_features->instance)
+				goto data_mem_free;
+
+			dev_data = &ctx->mem_repair[mem_repair_inst];
+			dev_data->instance = mem_repair_inst;
+			dev_data->mem_repair_ops = ras_features->mem_repair_ops;
+			dev_data->private = ras_features->ctx;
+			ret = edac_mem_repair_get_desc(parent, &ras_attr_groups[attr_gcnt],
+						       ras_features->instance);
+			if (ret)
+				goto data_mem_free;
+
+			mem_repair_inst++;
+			attr_gcnt++;
+			break;
 		default:
 			ret = -EINVAL;
 			goto data_mem_free;
@@ -712,6 +743,7 @@  int edac_dev_register(struct device *parent, char *name,
 	return devm_add_action_or_reset(parent, edac_dev_unreg, &ctx->dev);
 
 data_mem_free:
+	kfree(ctx->mem_repair);
 	kfree(ctx->scrub);
 groups_free:
 	kfree(ras_attr_groups);
diff --git a/drivers/edac/mem_repair.c b/drivers/edac/mem_repair.c
new file mode 100755
index 000000000000..93246ad0c9eb
--- /dev/null
+++ b/drivers/edac/mem_repair.c
@@ -0,0 +1,367 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * The generic EDAC memory repair driver is designed to control the memory
+ * devices with memory repair features, such as Post Package Repair (PPR),
+ * memory sparing etc. The common sysfs memory repair interface abstracts
+ * the control of various arbitrary memory repair functionalities into a
+ * unified set of functions.
+ *
+ * Copyright (c) 2024 HiSilicon Limited.
+ */
+
+#include <linux/edac.h>
+
+enum edac_mem_repair_attributes {
+	MEM_REPAIR_TYPE,
+	MEM_REPAIR_PERSIST_MODE_AVAIL,
+	MEM_REPAIR_PERSIST_MODE,
+	MEM_REPAIR_DPA_SUPPORT,
+	MEM_REPAIR_SAFE_IN_USE,
+	MEM_REPAIR_HPA,
+	MEM_REPAIR_DPA,
+	MEM_REPAIR_NIBBLE_MASK,
+	MEM_REPAIR_BANK_GROUP,
+	MEM_REPAIR_BANK,
+	MEM_REPAIR_RANK,
+	MEM_REPAIR_ROW,
+	MEM_REPAIR_COLUMN,
+	MEM_REPAIR_CHANNEL,
+	MEM_REPAIR_SUB_CHANNEL,
+	MEM_REPAIR_QUERY,
+	MEM_DO_REPAIR,
+	MEM_REPAIR_MAX_ATTRS
+};
+
+struct edac_mem_repair_dev_attr {
+	struct device_attribute dev_attr;
+	u8 instance;
+};
+
+struct edac_mem_repair_context {
+	char name[EDAC_FEAT_NAME_LEN];
+	struct edac_mem_repair_dev_attr mem_repair_dev_attr[MEM_REPAIR_MAX_ATTRS];
+	struct attribute *mem_repair_attrs[MEM_REPAIR_MAX_ATTRS + 1];
+	struct attribute_group group;
+};
+
+#define TO_MEM_REPAIR_DEV_ATTR(_dev_attr)      \
+		container_of(_dev_attr, struct edac_mem_repair_dev_attr, dev_attr)
+
+#define EDAC_MEM_REPAIR_ATTR_SHOW(attrib, cb, type, format)			\
+static ssize_t attrib##_show(struct device *ras_feat_dev,			\
+			     struct device_attribute *attr, char *buf)		\
+{										\
+	u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance;			\
+	struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev);		\
+	const struct edac_mem_repair_ops *ops =					\
+				ctx->mem_repair[inst].mem_repair_ops;		\
+	type data;								\
+	int ret;								\
+										\
+	ret = ops->cb(ras_feat_dev->parent, ctx->mem_repair[inst].private,	\
+		      &data);							\
+	if (ret)								\
+		return ret;							\
+										\
+	return sysfs_emit(buf, format, data);					\
+}
+
+EDAC_MEM_REPAIR_ATTR_SHOW(repair_type, get_repair_type, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(persist_mode, get_persist_mode, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(dpa_support, get_dpa_support, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(repair_safe_when_in_use, get_repair_safe_when_in_use, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(hpa, get_hpa, u64, "0x%llx\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(dpa, get_dpa, u64, "0x%llx\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(nibble_mask, get_nibble_mask, u64, "0x%llx\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(bank_group, get_bank_group, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(bank, get_bank, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(rank, get_rank, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(row, get_row, u64, "0x%llx\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(column, get_column, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(channel, get_channel, u32, "%u\n")
+EDAC_MEM_REPAIR_ATTR_SHOW(sub_channel, get_sub_channel, u32, "%u\n")
+
+#define EDAC_MEM_REPAIR_ATTR_STORE(attrib, cb, type, conv_func)			\
+static ssize_t attrib##_store(struct device *ras_feat_dev,			\
+			      struct device_attribute *attr,			\
+			      const char *buf, size_t len)			\
+{										\
+	u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance;			\
+	struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev);		\
+	const struct edac_mem_repair_ops *ops =					\
+				ctx->mem_repair[inst].mem_repair_ops;		\
+	type data;								\
+	int ret;								\
+										\
+	ret = conv_func(buf, 0, &data);						\
+	if (ret < 0)								\
+		return ret;							\
+										\
+	ret = ops->cb(ras_feat_dev->parent, ctx->mem_repair[inst].private,	\
+		      data);							\
+	if (ret)								\
+		return ret;							\
+										\
+	return len;								\
+}
+
+EDAC_MEM_REPAIR_ATTR_STORE(persist_mode, set_persist_mode, unsigned long, kstrtoul)
+EDAC_MEM_REPAIR_ATTR_STORE(hpa, set_hpa, u64, kstrtou64)
+EDAC_MEM_REPAIR_ATTR_STORE(dpa, set_dpa, u64, kstrtou64)
+EDAC_MEM_REPAIR_ATTR_STORE(nibble_mask, set_nibble_mask, u64, kstrtou64)
+EDAC_MEM_REPAIR_ATTR_STORE(bank_group, set_bank_group, unsigned long, kstrtoul)
+EDAC_MEM_REPAIR_ATTR_STORE(bank, set_bank, unsigned long, kstrtoul)
+EDAC_MEM_REPAIR_ATTR_STORE(rank, set_rank, unsigned long, kstrtoul)
+EDAC_MEM_REPAIR_ATTR_STORE(row, set_row, u64, kstrtou64)
+EDAC_MEM_REPAIR_ATTR_STORE(column, set_column, unsigned long, kstrtoul)
+EDAC_MEM_REPAIR_ATTR_STORE(channel, set_channel, unsigned long, kstrtoul)
+EDAC_MEM_REPAIR_ATTR_STORE(sub_channel, set_sub_channel, unsigned long, kstrtoul)
+
+#define EDAC_MEM_REPAIR_DO_OP(attrib, cb)						\
+static ssize_t attrib##_store(struct device *ras_feat_dev,				\
+			      struct device_attribute *attr,				\
+			      const char *buf, size_t len)				\
+{											\
+	u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance;				\
+	struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev);			\
+	const struct edac_mem_repair_ops *ops = ctx->mem_repair[inst].mem_repair_ops;	\
+	int ret;									\
+											\
+	ret = ops->cb(ras_feat_dev->parent, ctx->mem_repair[inst].private);		\
+	if (ret)									\
+		return ret;								\
+											\
+	return len;									\
+}
+
+EDAC_MEM_REPAIR_DO_OP(query, do_query)
+EDAC_MEM_REPAIR_DO_OP(repair, do_repair)
+
+static ssize_t persist_mode_avail_show(struct device *ras_feat_dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev);
+	u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance;
+	const struct edac_mem_repair_ops *ops = ctx->mem_repair[inst].mem_repair_ops;
+
+	return ops->get_persist_mode_avail(ras_feat_dev->parent,
+					   ctx->mem_repair[inst].private, buf);
+}
+
+static umode_t mem_repair_attr_visible(struct kobject *kobj, struct attribute *a, int attr_id)
+{
+	struct device *ras_feat_dev = kobj_to_dev(kobj);
+	struct device_attribute *dev_attr = container_of(a, struct device_attribute, attr);
+	struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev);
+	u8 inst = TO_MEM_REPAIR_DEV_ATTR(dev_attr)->instance;
+	const struct edac_mem_repair_ops *ops = ctx->mem_repair[inst].mem_repair_ops;
+
+	switch (attr_id) {
+	case MEM_REPAIR_TYPE:
+		if (ops->get_repair_type)
+			return a->mode;
+		break;
+	case MEM_REPAIR_PERSIST_MODE_AVAIL:
+		if (ops->get_persist_mode_avail)
+			return a->mode;
+		break;
+	case MEM_REPAIR_PERSIST_MODE:
+		if (ops->get_persist_mode) {
+			if (ops->set_persist_mode)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_DPA_SUPPORT:
+		if (ops->get_dpa_support)
+			return a->mode;
+		break;
+	case MEM_REPAIR_SAFE_IN_USE:
+		if (ops->get_repair_safe_when_in_use)
+			return a->mode;
+		break;
+	case MEM_REPAIR_HPA:
+		if (ops->get_hpa) {
+			if (ops->set_hpa)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_DPA:
+		if (ops->get_dpa) {
+			if (ops->set_dpa)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_NIBBLE_MASK:
+		if (ops->get_nibble_mask) {
+			if (ops->set_nibble_mask)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_BANK_GROUP:
+		if (ops->get_bank_group) {
+			if (ops->set_bank_group)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_BANK:
+		if (ops->get_bank) {
+			if (ops->set_bank)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_RANK:
+		if (ops->get_rank) {
+			if (ops->set_rank)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_ROW:
+		if (ops->get_row) {
+			if (ops->set_row)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_COLUMN:
+		if (ops->get_column) {
+			if (ops->set_column)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_CHANNEL:
+		if (ops->get_channel) {
+			if (ops->set_channel)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_SUB_CHANNEL:
+		if (ops->get_sub_channel) {
+			if (ops->set_sub_channel)
+				return a->mode;
+			else
+				return 0444;
+		}
+		break;
+	case MEM_REPAIR_QUERY:
+		if (ops->do_query)
+			return a->mode;
+		break;
+	case MEM_DO_REPAIR:
+		if (ops->do_repair)
+			return a->mode;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+#define EDAC_MEM_REPAIR_ATTR_RO(_name, _instance)       \
+	((struct edac_mem_repair_dev_attr) { .dev_attr = __ATTR_RO(_name), \
+					     .instance = _instance })
+
+#define EDAC_MEM_REPAIR_ATTR_WO(_name, _instance)       \
+	((struct edac_mem_repair_dev_attr) { .dev_attr = __ATTR_WO(_name), \
+					     .instance = _instance })
+
+#define EDAC_MEM_REPAIR_ATTR_RW(_name, _instance)       \
+	((struct edac_mem_repair_dev_attr) { .dev_attr = __ATTR_RW(_name), \
+					     .instance = _instance })
+
+static int mem_repair_create_desc(struct device *dev,
+				  const struct attribute_group **attr_groups,
+				  u8 instance)
+{
+	struct edac_mem_repair_context *ctx;
+	struct attribute_group *group;
+	int i;
+	struct edac_mem_repair_dev_attr dev_attr[] = {
+		[MEM_REPAIR_TYPE] = EDAC_MEM_REPAIR_ATTR_RO(repair_type,
+							    instance),
+		[MEM_REPAIR_PERSIST_MODE_AVAIL] =
+				EDAC_MEM_REPAIR_ATTR_RO(persist_mode_avail,
+							instance),
+		[MEM_REPAIR_PERSIST_MODE] =
+				EDAC_MEM_REPAIR_ATTR_RW(persist_mode, instance),
+		[MEM_REPAIR_DPA_SUPPORT] =
+				EDAC_MEM_REPAIR_ATTR_RO(dpa_support, instance),
+		[MEM_REPAIR_SAFE_IN_USE] =
+				EDAC_MEM_REPAIR_ATTR_RO(repair_safe_when_in_use,
+							instance),
+		[MEM_REPAIR_HPA] = EDAC_MEM_REPAIR_ATTR_RW(hpa, instance),
+		[MEM_REPAIR_DPA] = EDAC_MEM_REPAIR_ATTR_RW(dpa, instance),
+		[MEM_REPAIR_NIBBLE_MASK] =
+				EDAC_MEM_REPAIR_ATTR_RW(nibble_mask, instance),
+		[MEM_REPAIR_BANK_GROUP] =
+				EDAC_MEM_REPAIR_ATTR_RW(bank_group, instance),
+		[MEM_REPAIR_BANK] = EDAC_MEM_REPAIR_ATTR_RW(bank, instance),
+		[MEM_REPAIR_RANK] = EDAC_MEM_REPAIR_ATTR_RW(rank, instance),
+		[MEM_REPAIR_ROW] = EDAC_MEM_REPAIR_ATTR_RW(row, instance),
+		[MEM_REPAIR_COLUMN] = EDAC_MEM_REPAIR_ATTR_RW(column, instance),
+		[MEM_REPAIR_CHANNEL] = EDAC_MEM_REPAIR_ATTR_RW(channel, instance),
+		[MEM_REPAIR_SUB_CHANNEL] =
+				EDAC_MEM_REPAIR_ATTR_RW(sub_channel, instance),
+		[MEM_REPAIR_QUERY] = EDAC_MEM_REPAIR_ATTR_WO(query, instance),
+		[MEM_DO_REPAIR] = EDAC_MEM_REPAIR_ATTR_WO(repair, instance)
+	};
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	for (i = 0; i < MEM_REPAIR_MAX_ATTRS; i++) {
+		memcpy(&ctx->mem_repair_dev_attr[i].dev_attr,
+		       &dev_attr[i], sizeof(dev_attr[i]));
+		ctx->mem_repair_attrs[i] =
+				&ctx->mem_repair_dev_attr[i].dev_attr.attr;
+	}
+
+	sprintf(ctx->name, "%s%d", "mem_repair", instance);
+	group = &ctx->group;
+	group->name = ctx->name;
+	group->attrs = ctx->mem_repair_attrs;
+	group->is_visible  = mem_repair_attr_visible;
+	attr_groups[0] = group;
+
+	return 0;
+}
+
+/**
+ * edac_mem_repair_get_desc - get EDAC memory repair descriptors
+ * @dev: client device with memory repair feature
+ * @attr_groups: pointer to attribute group container
+ * @instance: device's memory repair instance number.
+ *
+ * Return:
+ *  * %0	- Success.
+ *  * %-EINVAL	- Invalid parameters passed.
+ *  * %-ENOMEM	- Dynamic memory allocation failed.
+ */
+int edac_mem_repair_get_desc(struct device *dev,
+			     const struct attribute_group **attr_groups, u8 instance)
+{
+	if (!dev || !attr_groups)
+		return -EINVAL;
+
+	return mem_repair_create_desc(dev, attr_groups, instance);
+}
diff --git a/include/linux/edac.h b/include/linux/edac.h
index 04385b1a9283..b52730d63088 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -670,6 +670,7 @@  static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci,
 enum edac_dev_feat {
 	RAS_FEAT_SCRUB,
 	RAS_FEAT_ECS,
+	RAS_FEAT_MEM_REPAIR,
 	RAS_FEAT_MAX
 };
 
@@ -731,11 +732,95 @@  int edac_ecs_get_desc(struct device *ecs_dev,
 		      const struct attribute_group **attr_groups,
 		      u16 num_media_frus);
 
+enum edac_mem_repair_type {
+	EDAC_TYPE_SPPR,
+	EDAC_TYPE_HPPR,
+	EDAC_TYPE_CACHELINE_MEM_SPARING,
+	EDAC_TYPE_ROW_MEM_SPARING,
+	EDAC_TYPE_BANK_MEM_SPARING,
+	EDAC_TYPE_RANK_MEM_SPARING,
+};
+
+enum edac_mem_repair_persist_mode {
+	EDAC_MEM_REPAIR_SOFT, /* soft memory repair */
+	EDAC_MEM_REPAIR_HARD, /* hard memory repair */
+};
+
+/**
+ * struct edac_mem_repair_ops - memory repair device operations
+ * (all elements optional)
+ * @get_repair_type: get the memory repair type, listed in enum edac_mem_repair_type.
+ * @get_persist_mode_avail: get the persist modes supported in the device.
+ * @get_persist_mode: get the persist mode of the memory repair instance.
+ * @set_persist_mode: set the persist mode for the memory repair instance.
+ * @get_dpa_support: get dpa support flag.
+ * @get_repair_safe_when_in_use: get whether memory media is accessible and
+ *			       data is retained during repair operation.
+ * @get_hpa: get HPA for memory repair.
+ * @set_hpa: set HPA for memory repair.
+ * @get_dpa: get DPA for memory repair.
+ * @set_dpa: set DPA for memory repair.
+ * @get_nibble_mask: get nibble mask for memory repair.
+ * @set_nibble_mask: set nibble mask for memory repair.
+ * @get_bank_group: get bank group for memory repair.
+ * @set_bank_group: set bank group for memory repair.
+ * @get_bank: get bank for memory repair.
+ * @set_bank: set bank for memory repair.
+ * @get_rank: get rank for memory repair.
+ * @set_rank: set rank for memory repair.
+ * @get_row: get row for memory repair.
+ * @set_row: set row for memory repair.
+ * @get_column: get column for memory repair.
+ * @set_column: set column for memory repair.
+ * @get_channel: get channel for memory repair.
+ * @set_channel: set channel for memory repair.
+ * @get_sub_channel: get sub channel for memory repair.
+ * @set_sub_channel: set sub channel for memory repair.
+ * @do_query: Query memory repair operation for the HPA/DPA/other attrs set
+ *	      is supported or not.
+ * @do_repair: start memory repair operation for the HPA/DPA/other attrs set.
+ */
+struct edac_mem_repair_ops {
+	int (*get_repair_type)(struct device *dev, void *drv_data, u32 *val);
+	int (*get_persist_mode_avail)(struct device *dev, void *drv_data, char *buf);
+	int (*get_persist_mode)(struct device *dev, void *drv_data, u32 *mode);
+	int (*set_persist_mode)(struct device *dev, void *drv_data, u32 mode);
+	int (*get_dpa_support)(struct device *dev, void *drv_data, u32 *val);
+	int (*get_repair_safe_when_in_use)(struct device *dev, void *drv_data, u32 *val);
+	int (*get_hpa)(struct device *dev, void *drv_data, u64 *hpa);
+	int (*set_hpa)(struct device *dev, void *drv_data, u64 hpa);
+	int (*get_dpa)(struct device *dev, void *drv_data, u64 *dpa);
+	int (*set_dpa)(struct device *dev, void *drv_data, u64 dpa);
+	int (*get_nibble_mask)(struct device *dev, void *drv_data, u64 *val);
+	int (*set_nibble_mask)(struct device *dev, void *drv_data, u64 val);
+	int (*get_bank_group)(struct device *dev, void *drv_data, u32 *val);
+	int (*set_bank_group)(struct device *dev, void *drv_data, u32 val);
+	int (*get_bank)(struct device *dev, void *drv_data, u32 *val);
+	int (*set_bank)(struct device *dev, void *drv_data, u32 val);
+	int (*get_rank)(struct device *dev, void *drv_data, u32 *val);
+	int (*set_rank)(struct device *dev, void *drv_data, u32 val);
+	int (*get_row)(struct device *dev, void *drv_data, u64 *val);
+	int (*set_row)(struct device *dev, void *drv_data, u64 val);
+	int (*get_column)(struct device *dev, void *drv_data, u32 *val);
+	int (*set_column)(struct device *dev, void *drv_data, u32 val);
+	int (*get_channel)(struct device *dev, void *drv_data, u32 *val);
+	int (*set_channel)(struct device *dev, void *drv_data, u32 val);
+	int (*get_sub_channel)(struct device *dev, void *drv_data, u32 *val);
+	int (*set_sub_channel)(struct device *dev, void *drv_data, u32 val);
+	int (*do_query)(struct device *dev, void *drv_data);
+	int (*do_repair)(struct device *dev, void *drv_data);
+};
+
+int edac_mem_repair_get_desc(struct device *dev,
+			     const struct attribute_group **attr_groups,
+			     u8 instance);
+
 /* EDAC device feature information structure */
 struct edac_dev_data {
 	union {
 		const struct edac_scrub_ops *scrub_ops;
 		const struct edac_ecs_ops *ecs_ops;
+		const struct edac_mem_repair_ops *mem_repair_ops;
 	};
 	u8 instance;
 	void *private;
@@ -746,6 +831,7 @@  struct edac_dev_feat_ctx {
 	void *private;
 	struct edac_dev_data *scrub;
 	struct edac_dev_data ecs;
+	struct edac_dev_data *mem_repair;
 };
 
 struct edac_dev_feature {
@@ -754,6 +840,7 @@  struct edac_dev_feature {
 	union {
 		const struct edac_scrub_ops *scrub_ops;
 		const struct edac_ecs_ops *ecs_ops;
+		const struct edac_mem_repair_ops *mem_repair_ops;
 	};
 	void *ctx;
 	struct edac_ecs_ex_info ecs_info;