diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index ad6d8c6b777e..fb53db187854 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -469,37 +469,16 @@ static void nfit_mem_find_spa_bdw(struct acpi_nfit_desc *acpi_desc,
 	nfit_mem->bdw = NULL;
 }
 
-static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
+static void nfit_mem_init_bdw(struct acpi_nfit_desc *acpi_desc,
 		struct nfit_mem *nfit_mem, struct acpi_nfit_system_address *spa)
 {
 	u16 dcr = __to_nfit_memdev(nfit_mem)->region_index;
 	struct nfit_memdev *nfit_memdev;
 	struct nfit_flush *nfit_flush;
-	struct nfit_dcr *nfit_dcr;
 	struct nfit_bdw *nfit_bdw;
 	struct nfit_idt *nfit_idt;
 	u16 idt_idx, range_index;
 
-	list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
-		if (nfit_dcr->dcr->region_index != dcr)
-			continue;
-		nfit_mem->dcr = nfit_dcr->dcr;
-		break;
-	}
-
-	if (!nfit_mem->dcr) {
-		dev_dbg(acpi_desc->dev, "SPA %d missing:%s%s\n",
-				spa->range_index, __to_nfit_memdev(nfit_mem)
-				? "" : " MEMDEV", nfit_mem->dcr ? "" : " DCR");
-		return -ENODEV;
-	}
-
-	/*
-	 * We've found enough to create an nvdimm, optionally
-	 * find an associated BDW
-	 */
-	list_add(&nfit_mem->list, &acpi_desc->dimms);
-
 	list_for_each_entry(nfit_bdw, &acpi_desc->bdws, list) {
 		if (nfit_bdw->bdw->region_index != dcr)
 			continue;
@@ -508,12 +487,12 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
 	}
 
 	if (!nfit_mem->bdw)
-		return 0;
+		return;
 
 	nfit_mem_find_spa_bdw(acpi_desc, nfit_mem);
 
 	if (!nfit_mem->spa_bdw)
-		return 0;
+		return;
 
 	range_index = nfit_mem->spa_bdw->range_index;
 	list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
@@ -538,8 +517,6 @@ static int nfit_mem_add(struct acpi_nfit_desc *acpi_desc,
 		}
 		break;
 	}
-
-	return 0;
 }
 
 static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
@@ -548,7 +525,6 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
 	struct nfit_mem *nfit_mem, *found;
 	struct nfit_memdev *nfit_memdev;
 	int type = nfit_spa_type(spa);
-	u16 dcr;
 
 	switch (type) {
 	case NFIT_SPA_DCR:
@@ -559,14 +535,18 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
 	}
 
 	list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
-		int rc;
+		struct nfit_dcr *nfit_dcr;
+		u32 device_handle;
+		u16 dcr;
 
 		if (nfit_memdev->memdev->range_index != spa->range_index)
 			continue;
 		found = NULL;
 		dcr = nfit_memdev->memdev->region_index;
+		device_handle = nfit_memdev->memdev->device_handle;
 		list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)
-			if (__to_nfit_memdev(nfit_mem)->region_index == dcr) {
+			if (__to_nfit_memdev(nfit_mem)->device_handle
+					== device_handle) {
 				found = nfit_mem;
 				break;
 			}
@@ -579,6 +559,31 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
 			if (!nfit_mem)
 				return -ENOMEM;
 			INIT_LIST_HEAD(&nfit_mem->list);
+			list_add(&nfit_mem->list, &acpi_desc->dimms);
+		}
+
+		list_for_each_entry(nfit_dcr, &acpi_desc->dcrs, list) {
+			if (nfit_dcr->dcr->region_index != dcr)
+				continue;
+			/*
+			 * Record the control region for the dimm.  For
+			 * the ACPI 6.1 case, where there are separate
+			 * control regions for the pmem vs blk
+			 * interfaces, be sure to record the extended
+			 * blk details.
+			 */
+			if (!nfit_mem->dcr)
+				nfit_mem->dcr = nfit_dcr->dcr;
+			else if (nfit_mem->dcr->windows == 0
+					&& nfit_dcr->dcr->windows)
+				nfit_mem->dcr = nfit_dcr->dcr;
+			break;
+		}
+
+		if (dcr && !nfit_mem->dcr) {
+			dev_err(acpi_desc->dev, "SPA %d missing DCR %d\n",
+					spa->range_index, dcr);
+			return -ENODEV;
 		}
 
 		if (type == NFIT_SPA_DCR) {
@@ -595,6 +600,7 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
 				nfit_mem->idt_dcr = nfit_idt->idt;
 				break;
 			}
+			nfit_mem_init_bdw(acpi_desc, nfit_mem, spa);
 		} else {
 			/*
 			 * A single dimm may belong to multiple SPA-PM
@@ -603,13 +609,6 @@ static int nfit_mem_dcr_init(struct acpi_nfit_desc *acpi_desc,
 			 */
 			nfit_mem->memdev_pmem = nfit_memdev->memdev;
 		}
-
-		if (found)
-			continue;
-
-		rc = nfit_mem_add(acpi_desc, nfit_mem, spa);
-		if (rc)
-			return rc;
 	}
 
 	return 0;
@@ -1504,9 +1503,7 @@ static int ars_do_start(struct nvdimm_bus_descriptor *nd_desc,
 		case 1:
 			/* ARS unsupported, but we should never get here */
 			return 0;
-		case 2:
-			return -EINVAL;
-		case 3:
+		case 6:
 			/* ARS is in progress */
 			msleep(1000);
 			break;
@@ -1517,13 +1514,13 @@ static int ars_do_start(struct nvdimm_bus_descriptor *nd_desc,
 }
 
 static int ars_get_status(struct nvdimm_bus_descriptor *nd_desc,
-		struct nd_cmd_ars_status *cmd)
+		struct nd_cmd_ars_status *cmd, u32 size)
 {
 	int rc;
 
 	while (1) {
 		rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_STATUS, cmd,
-			sizeof(*cmd));
+			size);
 		if (rc || cmd->status & 0xffff)
 			return -ENXIO;
 
@@ -1538,6 +1535,8 @@ static int ars_get_status(struct nvdimm_bus_descriptor *nd_desc,
 		case 2:
 			/* No ARS performed for the current boot */
 			return 0;
+		case 3:
+			/* TODO: error list overflow support */
 		default:
 			return -ENXIO;
 		}
@@ -1581,6 +1580,7 @@ static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc,
 	struct nd_cmd_ars_start *ars_start = NULL;
 	struct nd_cmd_ars_cap *ars_cap = NULL;
 	u64 start, len, cur, remaining;
+	u32 ars_status_size;
 	int rc;
 
 	ars_cap = kzalloc(sizeof(*ars_cap), GFP_KERNEL);
@@ -1610,14 +1610,14 @@ static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc,
 	 * Check if a full-range ARS has been run. If so, use those results
 	 * without having to start a new ARS.
 	 */
-	ars_status = kzalloc(ars_cap->max_ars_out + sizeof(*ars_status),
-			GFP_KERNEL);
+	ars_status_size = ars_cap->max_ars_out;
+	ars_status = kzalloc(ars_status_size, GFP_KERNEL);
 	if (!ars_status) {
 		rc = -ENOMEM;
 		goto out;
 	}
 
-	rc = ars_get_status(nd_desc, ars_status);
+	rc = ars_get_status(nd_desc, ars_status, ars_status_size);
 	if (rc)
 		goto out;
 
@@ -1647,7 +1647,7 @@ static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc,
 		if (rc)
 			goto out;
 
-		rc = ars_get_status(nd_desc, ars_status);
+		rc = ars_get_status(nd_desc, ars_status, ars_status_size);
 		if (rc)
 			goto out;
 
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 7e2c43f701bc..5d28e9405f32 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -382,18 +382,18 @@ static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
 	[ND_CMD_ARS_CAP] = {
 		.in_num = 2,
 		.in_sizes = { 8, 8, },
+		.out_num = 4,
+		.out_sizes = { 4, 4, 4, 4, },
+	},
+	[ND_CMD_ARS_START] = {
+		.in_num = 5,
+		.in_sizes = { 8, 8, 2, 1, 5, },
 		.out_num = 2,
 		.out_sizes = { 4, 4, },
 	},
-	[ND_CMD_ARS_START] = {
-		.in_num = 4,
-		.in_sizes = { 8, 8, 2, 6, },
-		.out_num = 1,
-		.out_sizes = { 4, },
-	},
 	[ND_CMD_ARS_STATUS] = {
-		.out_num = 2,
-		.out_sizes = { 4, UINT_MAX, },
+		.out_num = 3,
+		.out_sizes = { 4, 4, UINT_MAX, },
 	},
 };
 
@@ -442,8 +442,8 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 		return in_field[1];
 	else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
 		return out_field[1];
-	else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 1)
-		return ND_CMD_ARS_STATUS_MAX;
+	else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2)
+		return out_field[1] - 8;
 
 	return UINT_MAX;
 }
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 7edf31671dab..8d0b54670184 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -41,7 +41,7 @@ struct pmem_device {
 	phys_addr_t		phys_addr;
 	/* when non-zero this device is hosting a 'pfn' instance */
 	phys_addr_t		data_offset;
-	unsigned long		pfn_flags;
+	u64			pfn_flags;
 	void __pmem		*virt_addr;
 	size_t			size;
 	struct badblocks	bb;
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index bed40dff0e86..141ffdd59960 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -26,9 +26,8 @@ enum {
 
 	/* need to set a limit somewhere, but yes, this is likely overkill */
 	ND_IOCTL_MAX_BUFLEN = SZ_4M,
-	ND_CMD_MAX_ELEM = 4,
+	ND_CMD_MAX_ELEM = 5,
 	ND_CMD_MAX_ENVELOPE = 16,
-	ND_CMD_ARS_STATUS_MAX = SZ_4K,
 	ND_MAX_MAPPINGS = 32,
 
 	/* region flag indicating to direct-map persistent memory by default */
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 5b4a4be06e2b..cc68b92124d4 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -66,14 +66,18 @@ struct nd_cmd_ars_cap {
 	__u64 length;
 	__u32 status;
 	__u32 max_ars_out;
+	__u32 clear_err_unit;
+	__u32 reserved;
 } __packed;
 
 struct nd_cmd_ars_start {
 	__u64 address;
 	__u64 length;
 	__u16 type;
-	__u8 reserved[6];
+	__u8 flags;
+	__u8 reserved[5];
 	__u32 status;
+	__u32 scrub_time;
 } __packed;
 
 struct nd_cmd_ars_status {
@@ -81,11 +85,14 @@ struct nd_cmd_ars_status {
 	__u32 out_length;
 	__u64 address;
 	__u64 length;
+	__u64 restart_address;
+	__u64 restart_length;
 	__u16 type;
+	__u16 flags;
 	__u32 num_records;
 	struct nd_ars_record {
 		__u32 handle;
-		__u32 flags;
+		__u32 reserved;
 		__u64 err_address;
 		__u64 length;
 	} __packed records[0];
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 7a1b5c3ef14e..b981a7b023f0 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -136,8 +136,10 @@ void *devm_memremap(struct device *dev, resource_size_t offset,
 	if (addr) {
 		*ptr = addr;
 		devres_add(dev, ptr);
-	} else
+	} else {
 		devres_free(ptr);
+		return ERR_PTR(-ENXIO);
+	}
 
 	return addr;
 }
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index 90bd2ea41032..b3281dcd4a5d 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -217,13 +217,16 @@ static int nfit_test_cmd_set_config_data(struct nd_cmd_set_config_hdr *nd_cmd,
 	return rc;
 }
 
+#define NFIT_TEST_ARS_RECORDS 4
+
 static int nfit_test_cmd_ars_cap(struct nd_cmd_ars_cap *nd_cmd,
 		unsigned int buf_len)
 {
 	if (buf_len < sizeof(*nd_cmd))
 		return -EINVAL;
 
-	nd_cmd->max_ars_out = 256;
+	nd_cmd->max_ars_out = sizeof(struct nd_cmd_ars_status)
+		+ NFIT_TEST_ARS_RECORDS * sizeof(struct nd_ars_record);
 	nd_cmd->status = (ND_ARS_PERSISTENT | ND_ARS_VOLATILE) << 16;
 
 	return 0;
@@ -246,7 +249,8 @@ static int nfit_test_cmd_ars_status(struct nd_cmd_ars_status *nd_cmd,
 	if (buf_len < sizeof(*nd_cmd))
 		return -EINVAL;
 
-	nd_cmd->out_length = 256;
+	nd_cmd->out_length = sizeof(struct nd_cmd_ars_status);
+	/* TODO: emit error records */
 	nd_cmd->num_records = 0;
 	nd_cmd->address = 0;
 	nd_cmd->length = -1ULL;