Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fixes from Dan Williams:
 "Several fixes to the DSM (ACPI device specific method) marshaling
  implementation.

  I consider these urgent enough to send for 4.9 consideration since
  they fix the kernel's handling of ARS (Address Range Scrub) commands.
  Especially for platforms without machine-check-recovery capabilities,
  successful execution of ARS commands enables the platform to
  potentially break out of an infinite reboot problem if a media error
  is present in the boot path. There is also a one line fix for a
  device-dax read-only mapping regression.

  Commits 9a901f5495e2 ("acpi, nfit: fix extended status translations
  for ACPI DSMs") and 325896ffdf90 ("device-dax: fix private mapping
  restriction, permit read-only") are true regression fixes for changes
  introduced this cycle.

  Commit efda1b5d87cb ("acpi, nfit, libnvdimm: fix / harden ars_status
  output length handling") fixes the kernel's handling of zero-length
  results, this never would have worked in the past, but we only just
  recently discovered a BIOS implementation that emits this arguably
  spec non-compliant result.

  The remaining two commits are additional fall out from thinking
  through the implications of a zero / truncated length result of the
  ARS Status command.

  In order to mitigate the risk that these changes introduce yet more
  regressions they are backstopped by a new unit test in commit
  a7de92dac9f0 ("tools/testing/nvdimm: unit test acpi_nfit_ctl()") that
  mocks up inputs to acpi_nfit_ctl()"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  device-dax: fix private mapping restriction, permit read-only
  tools/testing/nvdimm: unit test acpi_nfit_ctl()
  acpi, nfit: fix bus vs dimm confusion in xlat_status
  acpi, nfit: validate ars_status output buffer size
  acpi, nfit, libnvdimm: fix / harden ars_status output length handling
  acpi, nfit: fix extended status translations for ACPI DSMs

9 files changed, 326 insertions, 28 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 71a7d07c28c9..312c4b4dc363 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -94,7 +94,7 @@ static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
 	return to_acpi_device(acpi_desc->dev);
 }
 
-static int xlat_status(void *buf, unsigned int cmd, u32 status)
+static int xlat_bus_status(void *buf, unsigned int cmd, u32 status)
 {
 	struct nd_cmd_clear_error *clear_err;
 	struct nd_cmd_ars_status *ars_status;
@@ -113,7 +113,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
 		if ((status >> 16 & flags) == 0)
 			return -ENOTTY;
-		break;
+		return 0;
 	case ND_CMD_ARS_START:
 		/* ARS is in progress */
 		if ((status & 0xffff) == NFIT_ARS_START_BUSY)
@@ -122,7 +122,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		/* Command failed */
 		if (status & 0xffff)
 			return -EIO;
-		break;
+		return 0;
 	case ND_CMD_ARS_STATUS:
 		ars_status = buf;
 		/* Command failed */
@@ -146,7 +146,8 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		 * then just continue with the returned results.
 		 */
 		if (status == NFIT_ARS_STATUS_INTR) {
-			if (ars_status->flags & NFIT_ARS_F_OVERFLOW)
+			if (ars_status->out_length >= 40 && (ars_status->flags
+						& NFIT_ARS_F_OVERFLOW))
 				return -ENOSPC;
 			return 0;
 		}
@@ -154,7 +155,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		/* Unknown status */
 		if (status >> 16)
 			return -EIO;
-		break;
+		return 0;
 	case ND_CMD_CLEAR_ERROR:
 		clear_err = buf;
 		if (status & 0xffff)
@@ -163,7 +164,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 			return -EIO;
 		if (clear_err->length > clear_err->cleared)
 			return clear_err->cleared;
-		break;
+		return 0;
 	default:
 		break;
 	}
@@ -174,9 +175,18 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 	return 0;
 }
 
-static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
-		struct nvdimm *nvdimm, unsigned int cmd, void *buf,
-		unsigned int buf_len, int *cmd_rc)
+static int xlat_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
+		u32 status)
+{
+	if (!nvdimm)
+		return xlat_bus_status(buf, cmd, status);
+	if (status)
+		return -EIO;
+	return 0;
+}
+
+int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
+		unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
 {
 	struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc);
 	union acpi_object in_obj, in_buf, *out_obj;
@@ -298,7 +308,8 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 
 	for (i = 0, offset = 0; i < desc->out_num; i++) {
 		u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
-				(u32 *) out_obj->buffer.pointer);
+				(u32 *) out_obj->buffer.pointer,
+				out_obj->buffer.length - offset);
 
 		if (offset + out_size > out_obj->buffer.length) {
 			dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
@@ -333,7 +344,8 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 			 */
 			rc = buf_len - offset - in_buf.buffer.length;
 			if (cmd_rc)
-				*cmd_rc = xlat_status(buf, cmd, fw_status);
+				*cmd_rc = xlat_status(nvdimm, buf, cmd,
+						fw_status);
 		} else {
 			dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
 					__func__, dimm_name, cmd_name, buf_len,
@@ -343,7 +355,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 	} else {
 		rc = 0;
 		if (cmd_rc)
-			*cmd_rc = xlat_status(buf, cmd, fw_status);
+			*cmd_rc = xlat_status(nvdimm, buf, cmd, fw_status);
 	}
 
  out:
@@ -351,6 +363,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(acpi_nfit_ctl);
 
 static const char *spa_type_name(u16 type)
 {
@@ -2001,19 +2014,32 @@ static int ars_get_status(struct acpi_nfit_desc *acpi_desc)
 	return cmd_rc;
 }
 
-static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus,
+static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc,
 		struct nd_cmd_ars_status *ars_status)
 {
+	struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
 	int rc;
 	u32 i;
 
+	/*
+	 * First record starts at 44 byte offset from the start of the
+	 * payload.
+	 */
+	if (ars_status->out_length < 44)
+		return 0;
 	for (i = 0; i < ars_status->num_records; i++) {
+		/* only process full records */
+		if (ars_status->out_length
+				< 44 + sizeof(struct nd_ars_record) * (i + 1))
+			break;
 		rc = nvdimm_bus_add_poison(nvdimm_bus,
 				ars_status->records[i].err_address,
 				ars_status->records[i].length);
 		if (rc)
 			return rc;
 	}
+	if (i < ars_status->num_records)
+		dev_warn(acpi_desc->dev, "detected truncated ars results\n");
 
 	return 0;
 }
@@ -2266,8 +2292,7 @@ static int acpi_nfit_query_poison(struct acpi_nfit_desc *acpi_desc,
 	if (rc < 0 && rc != -ENOSPC)
 		return rc;
 
-	if (ars_status_process_records(acpi_desc->nvdimm_bus,
-				acpi_desc->ars_status))
+	if (ars_status_process_records(acpi_desc, acpi_desc->ars_status))
 		return -ENOMEM;
 
 	return 0;
diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h
index 14296f5267c8..fc29c2e9832e 100644
--- a/drivers/acpi/nfit/nfit.h
+++ b/drivers/acpi/nfit/nfit.h
@@ -240,5 +240,7 @@ const u8 *to_nfit_uuid(enum nfit_uuids id);
 int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *nfit, acpi_size sz);
 void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event);
 void __acpi_nvdimm_notify(struct device *dev, u32 event);
+int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
+		unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc);
 void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev);
 #endif /* __NFIT_H__ */
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index 3d94ff20fdca..286447a83dab 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -271,7 +271,7 @@ static int check_vma(struct dax_dev *dax_dev, struct vm_area_struct *vma,
 		return -ENXIO;
 
 	/* prevent private mappings from being established */
-	if ((vma->vm_flags & VM_SHARED) != VM_SHARED) {
+	if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
 		dev_info(dev, "%s: %s: fail, attempted private mapping\n",
 				current->comm, func);
 		return -EINVAL;
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index a8b6949a8778..23d4a1728cdf 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -715,7 +715,7 @@ EXPORT_SYMBOL_GPL(nd_cmd_in_size);
 
 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 		const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
-		const u32 *out_field)
+		const u32 *out_field, unsigned long remainder)
 {
 	if (idx >= desc->out_num)
 		return UINT_MAX;
@@ -727,9 +727,24 @@ 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 == 2)
-		return out_field[1] - 8;
-	else if (cmd == ND_CMD_CALL) {
+	else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
+		/*
+		 * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
+		 * "Size of Output Buffer in bytes, including this
+		 * field."
+		 */
+		if (out_field[1] < 4)
+			return 0;
+		/*
+		 * ACPI 6.1 is ambiguous if 'status' is included in the
+		 * output size. If we encounter an output size that
+		 * overshoots the remainder by 4 bytes, assume it was
+		 * including 'status'.
+		 */
+		if (out_field[1] - 8 == remainder)
+			return remainder;
+		return out_field[1] - 4;
+	} else if (cmd == ND_CMD_CALL) {
 		struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
 
 		return pkg->nd_size_out;
@@ -876,7 +891,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
 	/* process an output envelope */
 	for (i = 0; i < desc->out_num; i++) {
 		u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
-				(u32 *) in_env, (u32 *) out_env);
+				(u32 *) in_env, (u32 *) out_env, 0);
 		u32 copy;
 
 		if (out_size == UINT_MAX) {
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index f4947fda11e7..8458c5351e56 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -143,7 +143,7 @@ u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 		const struct nd_cmd_desc *desc, int idx, void *buf);
 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 		const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
-		const u32 *out_field);
+		const u32 *out_field, unsigned long remainder);
 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
 		struct nd_region_desc *ndr_desc);
diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild
index 582db95127ed..405212be044a 100644
--- a/tools/testing/nvdimm/Kbuild
+++ b/tools/testing/nvdimm/Kbuild
@@ -14,6 +14,7 @@ ldflags-y += --wrap=devm_memremap_pages
 ldflags-y += --wrap=insert_resource
 ldflags-y += --wrap=remove_resource
 ldflags-y += --wrap=acpi_evaluate_object
+ldflags-y += --wrap=acpi_evaluate_dsm
 
 DRIVERS := ../../../drivers
 NVDIMM_SRC := $(DRIVERS)/nvdimm
diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index 3ccef732fce9..64cae1a5deff 100644
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -26,14 +26,17 @@ static LIST_HEAD(iomap_head);
 
 static struct iomap_ops {
 	nfit_test_lookup_fn nfit_test_lookup;
+	nfit_test_evaluate_dsm_fn evaluate_dsm;
 	struct list_head list;
 } iomap_ops = {
 	.list = LIST_HEAD_INIT(iomap_ops.list),
 };
 
-void nfit_test_setup(nfit_test_lookup_fn lookup)
+void nfit_test_setup(nfit_test_lookup_fn lookup,
+		nfit_test_evaluate_dsm_fn evaluate)
 {
 	iomap_ops.nfit_test_lookup = lookup;
+	iomap_ops.evaluate_dsm = evaluate;
 	list_add_rcu(&iomap_ops.list, &iomap_head);
 }
 EXPORT_SYMBOL(nfit_test_setup);
@@ -367,4 +370,22 @@ acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
 }
 EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
 
+union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
+		u64 rev, u64 func, union acpi_object *argv4)
+{
+	union acpi_object *obj = ERR_PTR(-ENXIO);
+	struct iomap_ops *ops;
+
+	rcu_read_lock();
+	ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
+	if (ops)
+		obj = ops->evaluate_dsm(handle, uuid, rev, func, argv4);
+	rcu_read_unlock();
+
+	if (IS_ERR(obj))
+		return acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
+	return obj;
+}
+EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
+
 MODULE_LICENSE("GPL v2");
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index c9a6458cb63e..71620fa95953 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -23,6 +23,7 @@
 #include <linux/sizes.h>
 #include <linux/list.h>
 #include <linux/slab.h>
+#include <nd-core.h>
 #include <nfit.h>
 #include <nd.h>
 #include "nfit_test.h"
@@ -1506,6 +1507,225 @@ static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, resource_size_t dpa,
 	return 0;
 }
 
+static unsigned long nfit_ctl_handle;
+
+union acpi_object *result;
+
+static union acpi_object *nfit_test_evaluate_dsm(acpi_handle handle,
+		const u8 *uuid, u64 rev, u64 func, union acpi_object *argv4)
+{
+	if (handle != &nfit_ctl_handle)
+		return ERR_PTR(-ENXIO);
+
+	return result;
+}
+
+static int setup_result(void *buf, size_t size)
+{
+	result = kmalloc(sizeof(union acpi_object) + size, GFP_KERNEL);
+	if (!result)
+		return -ENOMEM;
+	result->package.type = ACPI_TYPE_BUFFER,
+	result->buffer.pointer = (void *) (result + 1);
+	result->buffer.length = size;
+	memcpy(result->buffer.pointer, buf, size);
+	memset(buf, 0, size);
+	return 0;
+}
+
+static int nfit_ctl_test(struct device *dev)
+{
+	int rc, cmd_rc;
+	struct nvdimm *nvdimm;
+	struct acpi_device *adev;
+	struct nfit_mem *nfit_mem;
+	struct nd_ars_record *record;
+	struct acpi_nfit_desc *acpi_desc;
+	const u64 test_val = 0x0123456789abcdefULL;
+	unsigned long mask, cmd_size, offset;
+	union {
+		struct nd_cmd_get_config_size cfg_size;
+		struct nd_cmd_ars_status ars_stat;
+		struct nd_cmd_ars_cap ars_cap;
+		char buf[sizeof(struct nd_cmd_ars_status)
+			+ sizeof(struct nd_ars_record)];
+	} cmds;
+
+	adev = devm_kzalloc(dev, sizeof(*adev), GFP_KERNEL);
+	if (!adev)
+		return -ENOMEM;
+	*adev = (struct acpi_device) {
+		.handle = &nfit_ctl_handle,
+		.dev = {
+			.init_name = "test-adev",
+		},
+	};
+
+	acpi_desc = devm_kzalloc(dev, sizeof(*acpi_desc), GFP_KERNEL);
+	if (!acpi_desc)
+		return -ENOMEM;
+	*acpi_desc = (struct acpi_nfit_desc) {
+		.nd_desc = {
+			.cmd_mask = 1UL << ND_CMD_ARS_CAP
+				| 1UL << ND_CMD_ARS_START
+				| 1UL << ND_CMD_ARS_STATUS
+				| 1UL << ND_CMD_CLEAR_ERROR,
+			.module = THIS_MODULE,
+			.provider_name = "ACPI.NFIT",
+			.ndctl = acpi_nfit_ctl,
+		},
+		.dev = &adev->dev,
+	};
+
+	nfit_mem = devm_kzalloc(dev, sizeof(*nfit_mem), GFP_KERNEL);
+	if (!nfit_mem)
+		return -ENOMEM;
+
+	mask = 1UL << ND_CMD_SMART | 1UL << ND_CMD_SMART_THRESHOLD
+		| 1UL << ND_CMD_DIMM_FLAGS | 1UL << ND_CMD_GET_CONFIG_SIZE
+		| 1UL << ND_CMD_GET_CONFIG_DATA | 1UL << ND_CMD_SET_CONFIG_DATA
+		| 1UL << ND_CMD_VENDOR;
+	*nfit_mem = (struct nfit_mem) {
+		.adev = adev,
+		.family = NVDIMM_FAMILY_INTEL,
+		.dsm_mask = mask,
+	};
+
+	nvdimm = devm_kzalloc(dev, sizeof(*nvdimm), GFP_KERNEL);
+	if (!nvdimm)
+		return -ENOMEM;
+	*nvdimm = (struct nvdimm) {
+		.provider_data = nfit_mem,
+		.cmd_mask = mask,
+		.dev = {
+			.init_name = "test-dimm",
+		},
+	};
+
+
+	/* basic checkout of a typical 'get config size' command */
+	cmd_size = sizeof(cmds.cfg_size);
+	cmds.cfg_size = (struct nd_cmd_get_config_size) {
+		.status = 0,
+		.config_size = SZ_128K,
+		.max_xfer = SZ_4K,
+	};
+	rc = setup_result(cmds.buf, cmd_size);
+	if (rc)
+		return rc;
+	rc = acpi_nfit_ctl(&acpi_desc->nd_desc, nvdimm, ND_CMD_GET_CONFIG_SIZE,
+			cmds.buf, cmd_size, &cmd_rc);
+
+	if (rc < 0 || cmd_rc || cmds.cfg_size.status != 0
+			|| cmds.cfg_size.config_size != SZ_128K
+			|| cmds.cfg_size.max_xfer != SZ_4K) {
+		dev_dbg(dev, "%s: failed at: %d rc: %d cmd_rc: %d\n",
+				__func__, __LINE__, rc, cmd_rc);
+		return -EIO;
+	}
+
+
+	/* test ars_status with zero output */
+	cmd_size = offsetof(struct nd_cmd_ars_status, address);
+	cmds.ars_stat = (struct nd_cmd_ars_status) {
+		.out_length = 0,
+	};
+	rc = setup_result(cmds.buf, cmd_size);
+	if (rc)
+		return rc;
+	rc = acpi_nfit_ctl(&acpi_desc->nd_desc, NULL, ND_CMD_ARS_STATUS,
+			cmds.buf, cmd_size, &cmd_rc);
+
+	if (rc < 0 || cmd_rc) {
+		dev_dbg(dev, "%s: failed at: %d rc: %d cmd_rc: %d\n",
+				__func__, __LINE__, rc, cmd_rc);
+		return -EIO;
+	}
+
+
+	/* test ars_cap with benign extended status */
+	cmd_size = sizeof(cmds.ars_cap);
+	cmds.ars_cap = (struct nd_cmd_ars_cap) {
+		.status = ND_ARS_PERSISTENT << 16,
+	};
+	offset = offsetof(struct nd_cmd_ars_cap, status);
+	rc = setup_result(cmds.buf + offset, cmd_size - offset);
+	if (rc)
+		return rc;
+	rc = acpi_nfit_ctl(&acpi_desc->nd_desc, NULL, ND_CMD_ARS_CAP,
+			cmds.buf, cmd_size, &cmd_rc);
+
+	if (rc < 0 || cmd_rc) {
+		dev_dbg(dev, "%s: failed at: %d rc: %d cmd_rc: %d\n",
+				__func__, __LINE__, rc, cmd_rc);
+		return -EIO;
+	}
+
+
+	/* test ars_status with 'status' trimmed from 'out_length' */
+	cmd_size = sizeof(cmds.ars_stat) + sizeof(struct nd_ars_record);
+	cmds.ars_stat = (struct nd_cmd_ars_status) {
+		.out_length = cmd_size - 4,
+	};
+	record = &cmds.ars_stat.records[0];
+	*record = (struct nd_ars_record) {
+		.length = test_val,
+	};
+	rc = setup_result(cmds.buf, cmd_size);
+	if (rc)
+		return rc;
+	rc = acpi_nfit_ctl(&acpi_desc->nd_desc, NULL, ND_CMD_ARS_STATUS,
+			cmds.buf, cmd_size, &cmd_rc);
+
+	if (rc < 0 || cmd_rc || record->length != test_val) {
+		dev_dbg(dev, "%s: failed at: %d rc: %d cmd_rc: %d\n",
+				__func__, __LINE__, rc, cmd_rc);
+		return -EIO;
+	}
+
+
+	/* test ars_status with 'Output (Size)' including 'status' */
+	cmd_size = sizeof(cmds.ars_stat) + sizeof(struct nd_ars_record);
+	cmds.ars_stat = (struct nd_cmd_ars_status) {
+		.out_length = cmd_size,
+	};
+	record = &cmds.ars_stat.records[0];
+	*record = (struct nd_ars_record) {
+		.length = test_val,
+	};
+	rc = setup_result(cmds.buf, cmd_size);
+	if (rc)
+		return rc;
+	rc = acpi_nfit_ctl(&acpi_desc->nd_desc, NULL, ND_CMD_ARS_STATUS,
+			cmds.buf, cmd_size, &cmd_rc);
+
+	if (rc < 0 || cmd_rc || record->length != test_val) {
+		dev_dbg(dev, "%s: failed at: %d rc: %d cmd_rc: %d\n",
+				__func__, __LINE__, rc, cmd_rc);
+		return -EIO;
+	}
+
+
+	/* test extended status for get_config_size results in failure */
+	cmd_size = sizeof(cmds.cfg_size);
+	cmds.cfg_size = (struct nd_cmd_get_config_size) {
+		.status = 1 << 16,
+	};
+	rc = setup_result(cmds.buf, cmd_size);
+	if (rc)
+		return rc;
+	rc = acpi_nfit_ctl(&acpi_desc->nd_desc, nvdimm, ND_CMD_GET_CONFIG_SIZE,
+			cmds.buf, cmd_size, &cmd_rc);
+
+	if (rc < 0 || cmd_rc >= 0) {
+		dev_dbg(dev, "%s: failed at: %d rc: %d cmd_rc: %d\n",
+				__func__, __LINE__, rc, cmd_rc);
+		return -EIO;
+	}
+
+	return 0;
+}
+
 static int nfit_test_probe(struct platform_device *pdev)
 {
 	struct nvdimm_bus_descriptor *nd_desc;
@@ -1516,6 +1736,12 @@ static int nfit_test_probe(struct platform_device *pdev)
 	union acpi_object *obj;
 	int rc;
 
+	if (strcmp(dev_name(&pdev->dev), "nfit_test.0") == 0) {
+		rc = nfit_ctl_test(&pdev->dev);
+		if (rc)
+			return rc;
+	}
+
 	nfit_test = to_nfit_test(&pdev->dev);
 
 	/* common alloc */
@@ -1639,11 +1865,13 @@ static __init int nfit_test_init(void)
 {
 	int rc, i;
 
-	nfit_test_dimm = class_create(THIS_MODULE, "nfit_test_dimm");
-	if (IS_ERR(nfit_test_dimm))
-		return PTR_ERR(nfit_test_dimm);
+	nfit_test_setup(nfit_test_lookup, nfit_test_evaluate_dsm);
 
-	nfit_test_setup(nfit_test_lookup);
+	nfit_test_dimm = class_create(THIS_MODULE, "nfit_test_dimm");
+	if (IS_ERR(nfit_test_dimm)) {
+		rc = PTR_ERR(nfit_test_dimm);
+		goto err_register;
+	}
 
 	for (i = 0; i < NUM_NFITS; i++) {
 		struct nfit_test *nfit_test;
diff --git a/tools/testing/nvdimm/test/nfit_test.h b/tools/testing/nvdimm/test/nfit_test.h
index c281dd2e5e2d..f54c0032c6ff 100644
--- a/tools/testing/nvdimm/test/nfit_test.h
+++ b/tools/testing/nvdimm/test/nfit_test.h
@@ -31,11 +31,17 @@ struct nfit_test_resource {
 	void *buf;
 };
 
+union acpi_object;
+typedef void *acpi_handle;
+
 typedef struct nfit_test_resource *(*nfit_test_lookup_fn)(resource_size_t);
+typedef union acpi_object *(*nfit_test_evaluate_dsm_fn)(acpi_handle handle,
+		const u8 *uuid, u64 rev, u64 func, union acpi_object *argv4);
 void __iomem *__wrap_ioremap_nocache(resource_size_t offset,
 		unsigned long size);
 void __wrap_iounmap(volatile void __iomem *addr);
-void nfit_test_setup(nfit_test_lookup_fn lookup);
+void nfit_test_setup(nfit_test_lookup_fn lookup,
+		nfit_test_evaluate_dsm_fn evaluate);
 void nfit_test_teardown(void);
 struct nfit_test_resource *get_nfit_res(resource_size_t resource);
 #endif