libnvdimm for 4.6

1/ Asynchronous address range scrub:
 Given the capacities of next generation persistent memory devices a
 scrub operation to find all poison may take 10s of seconds.  We want
 this scrub work to be done asynchronously with the rest of system
 initialization, so we move it out of line from the NFIT probing, i.e.
 acpi_nfit_add().
 
 2/ Clear poison:
 ACPI 6.1 introduces the ability to send "clear error" commands to the
 ACPI0012:00 device representing the root of an "nvdimm bus".  Similar to
 relocating a bad block on a disk, this support clears media errors in
 response to a write.
 
 3/ Persistent memory resource tracking:
 A persistent memory range may be designated as simply "reserved" by
 platform firmware in the efi/e820 memory map.  Later when the NFIT
 driver loads it discovers that the range is "Persistent Memory".  The
 NFIT bus driver inserts a resource to advertise that "persistent"
 attribute in the system resource tree for /proc/iomem and
 kernel-internal usages.
 
 4/ Miscellaneous cleanups and fixes:
 Workaround section misaligned pmem ranges when allocating a struct page
 memmap, fix handling of the read-only case in the ioctl path, and clean
 up block device major number allocation.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJW6E0QAAoJEB7SkWpmfYgCM9EP/Aibi3BAYlv6KeCgLFXxNIyR
 Y7rA0K5UiJwzQMWmo3xQ4EOvAHVCQ33cVEdXy0zJPLnzQ+GCvaMuD/pxOB+HoZWq
 qUYdVvNomh7VzZDkbONidjuk4kwNHq8HtOo1bdGlPiXjIWEh3uop/rIShPFsRp9i
 RVByTE/9TGoDQ9Q6Aakw1GlvT75tZ36ZqwkM2jyzu1a7fmqfkfAJjjDY6gzm3/fJ
 OVv1SDGwknoTPMZFoAh5iyrzHsShw1l1nZFhP4LiulSUEYv4B1I0YNvzbmY9EkgQ
 LHg/HChXpDCfQN/68k0W7OX6rYPSNjeiX0Y+kqc9owznA32lxsdSMUHcEnGz/3ZE
 2yy0XfGMHYsXaWI514dKp1LceTvWYsuQ+NtYnDzEwMch9YjAJpOkxaJTqoRjD0rI
 2yxPamLrF1RP7r0jUw2OiMBBpf/N6NvwbIUJ4ssR87ryA8axNcs8Teeu1lgDjajS
 Xp2AKP5ViWP+lGdAJBY/fa70nSL6oyrHQlzV/3zAPyrVyhAfOTc5mHamlvzYYSBJ
 EoHDG1A0diP/E4wdiVNrD2fcKie5Vmp4Ws59OCAM8PwOJRXyRGfVB7PP+Q1DSZlc
 Tsh0QFjfGQOhS02VEaQPm7A19BYFgpTMgU6YqPOPyqVYALIqzj21Ov7+2VI73FyG
 ORqEjCAxLVto+3gjN0oD
 =F67V
 -----END PGP SIGNATURE-----

Merge tag 'libnvdimm-for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Dan Williams:

 - Asynchronous address range scrub:

     Given the capacities of next generation persistent memory devices a
     scrub operation to find all poison may take 10s of seconds.  We
     want this scrub work to be done asynchronously with the rest of
     system initialization, so we move it out of line from the NFIT
     probing, i.e. acpi_nfit_add().

 - Clear poison:

     ACPI 6.1 introduces the ability to send "clear error" commands to
     the ACPI0012:00 device representing the root of an "nvdimm bus".
     Similar to relocating a bad block on a disk, this support clears
     media errors in response to a write.

 - Persistent memory resource tracking:

     A persistent memory range may be designated as simply "reserved" by
     platform firmware in the efi/e820 memory map.  Later when the NFIT
     driver loads it discovers that the range is "Persistent Memory".

     The NFIT bus driver inserts a resource to advertise that
     "persistent" attribute in the system resource tree for /proc/iomem
     and kernel-internal usages.

 - Miscellaneous cleanups and fixes:

     Workaround section misaligned pmem ranges when allocating a struct
     page memmap, fix handling of the read-only case in the ioctl path,
     and clean up block device major number allocation.

* tag 'libnvdimm-for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (26 commits)
  libnvdimm, pmem: clear poison on write
  libnvdimm, pmem: fix kmap_atomic() leak in error path
  nvdimm/btt: don't allocate unused major device number
  nvdimm/blk: don't allocate unused major device number
  pmem: don't allocate unused major device number
  ACPI: Change NFIT driver to insert new resource
  resource: Export insert_resource and remove_resource
  resource: Add remove_resource interface
  resource: Change __request_region to inherit from immediate parent
  libnvdimm, pmem: fix ia64 build, use PHYS_PFN
  nfit, libnvdimm: clear poison command support
  libnvdimm, pfn: 'resource'-address and 'size' attributes for pfn devices
  libnvdimm, pmem: adjust for section collisions with 'System RAM'
  libnvdimm, pmem: fix 'pfn' support for section-misaligned namespaces
  libnvdimm: Fix security issue with DSM IOCTL.
  libnvdimm: Clean-up access mode check.
  tools/testing/nvdimm: expand ars unit testing
  nfit: disable userspace initiated ars during scrub
  nfit: scrub and register regions in a workqueue
  nfit, libnvdimm: async region scrub workqueue
  ...

tools/testing/nvdimm/test/nfit.c

@@ -151,6 +151,11 @@ struct nfit_test {
 	int (*alloc)(struct nfit_test *t);
 	void (*setup)(struct nfit_test *t);
 	int setup_hotplug;
+	struct ars_state {
+		struct nd_cmd_ars_status *ars_status;
+		unsigned long deadline;
+		spinlock_t lock;
+	} ars_state;
 };
 
 static struct nfit_test *to_nfit_test(struct device *dev)
@@ -218,6 +223,7 @@ static int nfit_test_cmd_set_config_data(struct nd_cmd_set_config_hdr *nd_cmd,
 }
 
 #define NFIT_TEST_ARS_RECORDS 4
+#define NFIT_TEST_CLEAR_ERR_UNIT 256
 
 static int nfit_test_cmd_ars_cap(struct nd_cmd_ars_cap *nd_cmd,
 		unsigned int buf_len)
@@ -228,44 +234,113 @@ static int nfit_test_cmd_ars_cap(struct nd_cmd_ars_cap *nd_cmd,
 	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;
+	nd_cmd->clear_err_unit = NFIT_TEST_CLEAR_ERR_UNIT;
 
 	return 0;
 }
 
-static int nfit_test_cmd_ars_start(struct nd_cmd_ars_start *nd_cmd,
-		unsigned int buf_len)
+/*
+ * Initialize the ars_state to return an ars_result 1 second in the future with
+ * a 4K error range in the middle of the requested address range.
+ */
+static void post_ars_status(struct ars_state *ars_state, u64 addr, u64 len)
 {
-	if (buf_len < sizeof(*nd_cmd))
+	struct nd_cmd_ars_status *ars_status;
+	struct nd_ars_record *ars_record;
+
+	ars_state->deadline = jiffies + 1*HZ;
+	ars_status = ars_state->ars_status;
+	ars_status->status = 0;
+	ars_status->out_length = sizeof(struct nd_cmd_ars_status)
+		+ sizeof(struct nd_ars_record);
+	ars_status->address = addr;
+	ars_status->length = len;
+	ars_status->type = ND_ARS_PERSISTENT;
+	ars_status->num_records = 1;
+	ars_record = &ars_status->records[0];
+	ars_record->handle = 0;
+	ars_record->err_address = addr + len / 2;
+	ars_record->length = SZ_4K;
+}
+
+static int nfit_test_cmd_ars_start(struct ars_state *ars_state,
+		struct nd_cmd_ars_start *ars_start, unsigned int buf_len,
+		int *cmd_rc)
+{
+	if (buf_len < sizeof(*ars_start))
 		return -EINVAL;
 
-	nd_cmd->status = 0;
+	spin_lock(&ars_state->lock);
+	if (time_before(jiffies, ars_state->deadline)) {
+		ars_start->status = NFIT_ARS_START_BUSY;
+		*cmd_rc = -EBUSY;
+	} else {
+		ars_start->status = 0;
+		ars_start->scrub_time = 1;
+		post_ars_status(ars_state, ars_start->address,
+				ars_start->length);
+		*cmd_rc = 0;
+	}
+	spin_unlock(&ars_state->lock);
 
 	return 0;
 }
 
-static int nfit_test_cmd_ars_status(struct nd_cmd_ars_status *nd_cmd,
-		unsigned int buf_len)
+static int nfit_test_cmd_ars_status(struct ars_state *ars_state,
+		struct nd_cmd_ars_status *ars_status, unsigned int buf_len,
+		int *cmd_rc)
 {
-	if (buf_len < sizeof(*nd_cmd))
+	if (buf_len < ars_state->ars_status->out_length)
 		return -EINVAL;
 
-	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;
-	nd_cmd->status = 0;
+	spin_lock(&ars_state->lock);
+	if (time_before(jiffies, ars_state->deadline)) {
+		memset(ars_status, 0, buf_len);
+		ars_status->status = NFIT_ARS_STATUS_BUSY;
+		ars_status->out_length = sizeof(*ars_status);
+		*cmd_rc = -EBUSY;
+	} else {
+		memcpy(ars_status, ars_state->ars_status,
+				ars_state->ars_status->out_length);
+		*cmd_rc = 0;
+	}
+	spin_unlock(&ars_state->lock);
+	return 0;
+}
 
+static int nfit_test_cmd_clear_error(struct nd_cmd_clear_error *clear_err,
+		unsigned int buf_len, int *cmd_rc)
+{
+	const u64 mask = NFIT_TEST_CLEAR_ERR_UNIT - 1;
+	if (buf_len < sizeof(*clear_err))
+		return -EINVAL;
+
+	if ((clear_err->address & mask) || (clear_err->length & mask))
+		return -EINVAL;
+
+	/*
+	 * Report 'all clear' success for all commands even though a new
+	 * scrub will find errors again.  This is enough to have the
+	 * error removed from the 'badblocks' tracking in the pmem
+	 * driver.
+	 */
+	clear_err->status = 0;
+	clear_err->cleared = clear_err->length;
+	*cmd_rc = 0;
 	return 0;
 }
 
 static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
 		struct nvdimm *nvdimm, unsigned int cmd, void *buf,
-		unsigned int buf_len)
+		unsigned int buf_len, int *cmd_rc)
 {
 	struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 	struct nfit_test *t = container_of(acpi_desc, typeof(*t), acpi_desc);
-	int i, rc = 0;
+	int i, rc = 0, __cmd_rc;
+
+	if (!cmd_rc)
+		cmd_rc = &__cmd_rc;
+	*cmd_rc = 0;
 
 	if (nvdimm) {
 		struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
@@ -297,6 +372,8 @@ static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
 			return -ENOTTY;
 		}
 	} else {
+		struct ars_state *ars_state = &t->ars_state;
+
 		if (!nd_desc || !test_bit(cmd, &nd_desc->dsm_mask))
 			return -ENOTTY;
 
@@ -305,10 +382,15 @@ static int nfit_test_ctl(struct nvdimm_bus_descriptor *nd_desc,
 			rc = nfit_test_cmd_ars_cap(buf, buf_len);
 			break;
 		case ND_CMD_ARS_START:
-			rc = nfit_test_cmd_ars_start(buf, buf_len);
+			rc = nfit_test_cmd_ars_start(ars_state, buf, buf_len,
+					cmd_rc);
 			break;
 		case ND_CMD_ARS_STATUS:
-			rc = nfit_test_cmd_ars_status(buf, buf_len);
+			rc = nfit_test_cmd_ars_status(ars_state, buf, buf_len,
+					cmd_rc);
+			break;
+		case ND_CMD_CLEAR_ERROR:
+			rc = nfit_test_cmd_clear_error(buf, buf_len, cmd_rc);
 			break;
 		default:
 			return -ENOTTY;
@@ -424,11 +506,25 @@ static struct nfit_test_resource *nfit_test_lookup(resource_size_t addr)
 	return NULL;
 }
 
+static int ars_state_init(struct device *dev, struct ars_state *ars_state)
+{
+	ars_state->ars_status = devm_kzalloc(dev,
+			sizeof(struct nd_cmd_ars_status)
+			+ sizeof(struct nd_ars_record) * NFIT_TEST_ARS_RECORDS,
+			GFP_KERNEL);
+	if (!ars_state->ars_status)
+		return -ENOMEM;
+	spin_lock_init(&ars_state->lock);
+	return 0;
+}
+
 static int nfit_test0_alloc(struct nfit_test *t)
 {
 	size_t nfit_size = sizeof(struct acpi_nfit_system_address) * NUM_SPA
 			+ sizeof(struct acpi_nfit_memory_map) * NUM_MEM
 			+ sizeof(struct acpi_nfit_control_region) * NUM_DCR
+			+ offsetof(struct acpi_nfit_control_region,
+					window_size) * NUM_DCR
 			+ sizeof(struct acpi_nfit_data_region) * NUM_BDW
 			+ sizeof(struct acpi_nfit_flush_address) * NUM_DCR;
 	int i;
@@ -471,14 +567,14 @@ static int nfit_test0_alloc(struct nfit_test *t)
 			return -ENOMEM;
 	}
 
-	return 0;
+	return ars_state_init(&t->pdev.dev, &t->ars_state);
 }
 
 static int nfit_test1_alloc(struct nfit_test *t)
 {
 	size_t nfit_size = sizeof(struct acpi_nfit_system_address)
 		+ sizeof(struct acpi_nfit_memory_map)
-		+ sizeof(struct acpi_nfit_control_region);
+		+ offsetof(struct acpi_nfit_control_region, window_size);
 
 	t->nfit_buf = test_alloc(t, nfit_size, &t->nfit_dma);
 	if (!t->nfit_buf)
@@ -489,12 +585,11 @@ static int nfit_test1_alloc(struct nfit_test *t)
 	if (!t->spa_set[0])
 		return -ENOMEM;
 
-	return 0;
+	return ars_state_init(&t->pdev.dev, &t->ars_state);
 }
 
 static void nfit_test0_setup(struct nfit_test *t)
 {
-	struct nvdimm_bus_descriptor *nd_desc;
 	struct acpi_nfit_desc *acpi_desc;
 	struct acpi_nfit_memory_map *memdev;
 	void *nfit_buf = t->nfit_buf;
@@ -611,7 +706,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->physical_id = 0;
 	memdev->region_id = 0;
 	memdev->range_index = 0+1;
-	memdev->region_index = 0+1;
+	memdev->region_index = 4+1;
 	memdev->region_size = SPA0_SIZE/2;
 	memdev->region_offset = t->spa_set_dma[0];
 	memdev->address = 0;
@@ -626,7 +721,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->physical_id = 1;
 	memdev->region_id = 0;
 	memdev->range_index = 0+1;
-	memdev->region_index = 1+1;
+	memdev->region_index = 5+1;
 	memdev->region_size = SPA0_SIZE/2;
 	memdev->region_offset = t->spa_set_dma[0] + SPA0_SIZE/2;
 	memdev->address = 0;
@@ -641,7 +736,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->physical_id = 0;
 	memdev->region_id = 1;
 	memdev->range_index = 1+1;
-	memdev->region_index = 0+1;
+	memdev->region_index = 4+1;
 	memdev->region_size = SPA1_SIZE/4;
 	memdev->region_offset = t->spa_set_dma[1];
 	memdev->address = SPA0_SIZE/2;
@@ -656,7 +751,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->physical_id = 1;
 	memdev->region_id = 1;
 	memdev->range_index = 1+1;
-	memdev->region_index = 1+1;
+	memdev->region_index = 5+1;
 	memdev->region_size = SPA1_SIZE/4;
 	memdev->region_offset = t->spa_set_dma[1] + SPA1_SIZE/4;
 	memdev->address = SPA0_SIZE/2;
@@ -671,7 +766,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->physical_id = 2;
 	memdev->region_id = 0;
 	memdev->range_index = 1+1;
-	memdev->region_index = 2+1;
+	memdev->region_index = 6+1;
 	memdev->region_size = SPA1_SIZE/4;
 	memdev->region_offset = t->spa_set_dma[1] + 2*SPA1_SIZE/4;
 	memdev->address = SPA0_SIZE/2;
@@ -686,7 +781,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->physical_id = 3;
 	memdev->region_id = 0;
 	memdev->range_index = 1+1;
-	memdev->region_index = 3+1;
+	memdev->region_index = 7+1;
 	memdev->region_size = SPA1_SIZE/4;
 	memdev->region_offset = t->spa_set_dma[1] + 3*SPA1_SIZE/4;
 	memdev->address = SPA0_SIZE/2;
@@ -814,7 +909,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	memdev->interleave_ways = 1;
 
 	offset = offset + sizeof(struct acpi_nfit_memory_map) * 14;
-	/* dcr-descriptor0 */
+	/* dcr-descriptor0: blk */
 	dcr = nfit_buf + offset;
 	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
 	dcr->header.length = sizeof(struct acpi_nfit_control_region);
@@ -823,6 +918,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->device_id = 0;
 	dcr->revision_id = 1;
 	dcr->serial_number = ~handle[0];
+	dcr->code = NFIT_FIC_BLK;
 	dcr->windows = 1;
 	dcr->window_size = DCR_SIZE;
 	dcr->command_offset = 0;
@@ -830,7 +926,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->status_offset = 8;
 	dcr->status_size = 4;
 
-	/* dcr-descriptor1 */
+	/* dcr-descriptor1: blk */
 	dcr = nfit_buf + offset + sizeof(struct acpi_nfit_control_region);
 	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
 	dcr->header.length = sizeof(struct acpi_nfit_control_region);
@@ -839,6 +935,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->device_id = 0;
 	dcr->revision_id = 1;
 	dcr->serial_number = ~handle[1];
+	dcr->code = NFIT_FIC_BLK;
 	dcr->windows = 1;
 	dcr->window_size = DCR_SIZE;
 	dcr->command_offset = 0;
@@ -846,7 +943,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->status_offset = 8;
 	dcr->status_size = 4;
 
-	/* dcr-descriptor2 */
+	/* dcr-descriptor2: blk */
 	dcr = nfit_buf + offset + sizeof(struct acpi_nfit_control_region) * 2;
 	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
 	dcr->header.length = sizeof(struct acpi_nfit_control_region);
@@ -855,6 +952,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->device_id = 0;
 	dcr->revision_id = 1;
 	dcr->serial_number = ~handle[2];
+	dcr->code = NFIT_FIC_BLK;
 	dcr->windows = 1;
 	dcr->window_size = DCR_SIZE;
 	dcr->command_offset = 0;
@@ -862,7 +960,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->status_offset = 8;
 	dcr->status_size = 4;
 
-	/* dcr-descriptor3 */
+	/* dcr-descriptor3: blk */
 	dcr = nfit_buf + offset + sizeof(struct acpi_nfit_control_region) * 3;
 	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
 	dcr->header.length = sizeof(struct acpi_nfit_control_region);
@@ -871,6 +969,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->device_id = 0;
 	dcr->revision_id = 1;
 	dcr->serial_number = ~handle[3];
+	dcr->code = NFIT_FIC_BLK;
 	dcr->windows = 1;
 	dcr->window_size = DCR_SIZE;
 	dcr->command_offset = 0;
@@ -879,6 +978,63 @@ static void nfit_test0_setup(struct nfit_test *t)
 	dcr->status_size = 4;
 
 	offset = offset + sizeof(struct acpi_nfit_control_region) * 4;
+	/* dcr-descriptor0: pmem */
+	dcr = nfit_buf + offset;
+	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+	dcr->header.length = offsetof(struct acpi_nfit_control_region,
+			window_size);
+	dcr->region_index = 4+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[0];
+	dcr->code = NFIT_FIC_BYTEN;
+	dcr->windows = 0;
+
+	/* dcr-descriptor1: pmem */
+	dcr = nfit_buf + offset + offsetof(struct acpi_nfit_control_region,
+			window_size);
+	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+	dcr->header.length = offsetof(struct acpi_nfit_control_region,
+			window_size);
+	dcr->region_index = 5+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[1];
+	dcr->code = NFIT_FIC_BYTEN;
+	dcr->windows = 0;
+
+	/* dcr-descriptor2: pmem */
+	dcr = nfit_buf + offset + offsetof(struct acpi_nfit_control_region,
+			window_size) * 2;
+	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+	dcr->header.length = offsetof(struct acpi_nfit_control_region,
+			window_size);
+	dcr->region_index = 6+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[2];
+	dcr->code = NFIT_FIC_BYTEN;
+	dcr->windows = 0;
+
+	/* dcr-descriptor3: pmem */
+	dcr = nfit_buf + offset + offsetof(struct acpi_nfit_control_region,
+			window_size) * 3;
+	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+	dcr->header.length = offsetof(struct acpi_nfit_control_region,
+			window_size);
+	dcr->region_index = 7+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[3];
+	dcr->code = NFIT_FIC_BYTEN;
+	dcr->windows = 0;
+
+	offset = offset + offsetof(struct acpi_nfit_control_region,
+			window_size) * 4;
 	/* bdw0 (spa/dcr0, dimm0) */
 	bdw = nfit_buf + offset;
 	bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
@@ -958,15 +1114,16 @@ static void nfit_test0_setup(struct nfit_test *t)
 
 	if (t->setup_hotplug) {
 		offset = offset + sizeof(struct acpi_nfit_flush_address) * 4;
-		/* dcr-descriptor4 */
+		/* dcr-descriptor4: blk */
 		dcr = nfit_buf + offset;
 		dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
 		dcr->header.length = sizeof(struct acpi_nfit_control_region);
-		dcr->region_index = 4+1;
+		dcr->region_index = 8+1;
 		dcr->vendor_id = 0xabcd;
 		dcr->device_id = 0;
 		dcr->revision_id = 1;
 		dcr->serial_number = ~handle[4];
+		dcr->code = NFIT_FIC_BLK;
 		dcr->windows = 1;
 		dcr->window_size = DCR_SIZE;
 		dcr->command_offset = 0;
@@ -975,11 +1132,26 @@ static void nfit_test0_setup(struct nfit_test *t)
 		dcr->status_size = 4;
 
 		offset = offset + sizeof(struct acpi_nfit_control_region);
+		/* dcr-descriptor4: pmem */
+		dcr = nfit_buf + offset;
+		dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+		dcr->header.length = offsetof(struct acpi_nfit_control_region,
+				window_size);
+		dcr->region_index = 9+1;
+		dcr->vendor_id = 0xabcd;
+		dcr->device_id = 0;
+		dcr->revision_id = 1;
+		dcr->serial_number = ~handle[4];
+		dcr->code = NFIT_FIC_BYTEN;
+		dcr->windows = 0;
+
+		offset = offset + offsetof(struct acpi_nfit_control_region,
+				window_size);
 		/* bdw4 (spa/dcr4, dimm4) */
 		bdw = nfit_buf + offset;
 		bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
 		bdw->header.length = sizeof(struct acpi_nfit_data_region);
-		bdw->region_index = 4+1;
+		bdw->region_index = 8+1;
 		bdw->windows = 1;
 		bdw->offset = 0;
 		bdw->size = BDW_SIZE;
@@ -1027,7 +1199,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 		memdev->physical_id = 4;
 		memdev->region_id = 0;
 		memdev->range_index = 10+1;
-		memdev->region_index = 4+1;
+		memdev->region_index = 8+1;
 		memdev->region_size = 0;
 		memdev->region_offset = 0;
 		memdev->address = 0;
@@ -1043,14 +1215,14 @@ static void nfit_test0_setup(struct nfit_test *t)
 		memdev->physical_id = 4;
 		memdev->region_id = 0;
 		memdev->range_index = 11+1;
-		memdev->region_index = 4+1;
+		memdev->region_index = 9+1;
 		memdev->region_size = SPA0_SIZE;
 		memdev->region_offset = t->spa_set_dma[2];
 		memdev->address = 0;
 		memdev->interleave_index = 0;
 		memdev->interleave_ways = 1;
 
-		/* mem-region16 (spa/dcr4, dimm4) */
+		/* mem-region16 (spa/bdw4, dimm4) */
 		memdev = nfit_buf + offset +
 				sizeof(struct acpi_nfit_memory_map) * 2;
 		memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
@@ -1059,7 +1231,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 		memdev->physical_id = 4;
 		memdev->region_id = 0;
 		memdev->range_index = 12+1;
-		memdev->region_index = 4+1;
+		memdev->region_index = 8+1;
 		memdev->region_size = 0;
 		memdev->region_offset = 0;
 		memdev->address = 0;
@@ -1076,6 +1248,8 @@ static void nfit_test0_setup(struct nfit_test *t)
 		flush->hint_address[0] = t->flush_dma[4];
 	}
 
+	post_ars_status(&t->ars_state, t->spa_set_dma[0], SPA0_SIZE);
+
 	acpi_desc = &t->acpi_desc;
 	set_bit(ND_CMD_GET_CONFIG_SIZE, &acpi_desc->dimm_dsm_force_en);
 	set_bit(ND_CMD_GET_CONFIG_DATA, &acpi_desc->dimm_dsm_force_en);
@@ -1083,8 +1257,7 @@ static void nfit_test0_setup(struct nfit_test *t)
 	set_bit(ND_CMD_ARS_CAP, &acpi_desc->bus_dsm_force_en);
 	set_bit(ND_CMD_ARS_START, &acpi_desc->bus_dsm_force_en);
 	set_bit(ND_CMD_ARS_STATUS, &acpi_desc->bus_dsm_force_en);
-	nd_desc = &acpi_desc->nd_desc;
-	nd_desc->ndctl = nfit_test_ctl;
+	set_bit(ND_CMD_CLEAR_ERROR, &acpi_desc->bus_dsm_force_en);
 }
 
 static void nfit_test1_setup(struct nfit_test *t)
@@ -1094,7 +1267,6 @@ static void nfit_test1_setup(struct nfit_test *t)
 	struct acpi_nfit_memory_map *memdev;
 	struct acpi_nfit_control_region *dcr;
 	struct acpi_nfit_system_address *spa;
-	struct nvdimm_bus_descriptor *nd_desc;
 	struct acpi_nfit_desc *acpi_desc;
 
 	offset = 0;
@@ -1130,26 +1302,23 @@ static void nfit_test1_setup(struct nfit_test *t)
 	/* dcr-descriptor0 */
 	dcr = nfit_buf + offset;
 	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
-	dcr->header.length = sizeof(struct acpi_nfit_control_region);
+	dcr->header.length = offsetof(struct acpi_nfit_control_region,
+			window_size);
 	dcr->region_index = 0+1;
 	dcr->vendor_id = 0xabcd;
 	dcr->device_id = 0;
 	dcr->revision_id = 1;
 	dcr->serial_number = ~0;
-	dcr->code = 0x201;
+	dcr->code = NFIT_FIC_BYTE;
 	dcr->windows = 0;
-	dcr->window_size = 0;
-	dcr->command_offset = 0;
-	dcr->command_size = 0;
-	dcr->status_offset = 0;
-	dcr->status_size = 0;
+
+	post_ars_status(&t->ars_state, t->spa_set_dma[0], SPA2_SIZE);
 
 	acpi_desc = &t->acpi_desc;
 	set_bit(ND_CMD_ARS_CAP, &acpi_desc->bus_dsm_force_en);
 	set_bit(ND_CMD_ARS_START, &acpi_desc->bus_dsm_force_en);
 	set_bit(ND_CMD_ARS_STATUS, &acpi_desc->bus_dsm_force_en);
-	nd_desc = &acpi_desc->nd_desc;
-	nd_desc->ndctl = nfit_test_ctl;
+	set_bit(ND_CMD_CLEAR_ERROR, &acpi_desc->bus_dsm_force_en);
 }
 
 static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, resource_size_t dpa,
@@ -1232,26 +1401,16 @@ static int nfit_test_probe(struct platform_device *pdev)
 
 	nfit_test->setup(nfit_test);
 	acpi_desc = &nfit_test->acpi_desc;
-	acpi_desc->dev = &pdev->dev;
+	acpi_nfit_desc_init(acpi_desc, &pdev->dev);
 	acpi_desc->nfit = nfit_test->nfit_buf;
 	acpi_desc->blk_do_io = nfit_test_blk_do_io;
 	nd_desc = &acpi_desc->nd_desc;
-	nd_desc->attr_groups = acpi_nfit_attribute_groups;
+	nd_desc->provider_name = NULL;
+	nd_desc->ndctl = nfit_test_ctl;
 	acpi_desc->nvdimm_bus = nvdimm_bus_register(&pdev->dev, nd_desc);
 	if (!acpi_desc->nvdimm_bus)
 		return -ENXIO;
 
-	INIT_LIST_HEAD(&acpi_desc->spa_maps);
-	INIT_LIST_HEAD(&acpi_desc->spas);
-	INIT_LIST_HEAD(&acpi_desc->dcrs);
-	INIT_LIST_HEAD(&acpi_desc->bdws);
-	INIT_LIST_HEAD(&acpi_desc->idts);
-	INIT_LIST_HEAD(&acpi_desc->flushes);
-	INIT_LIST_HEAD(&acpi_desc->memdevs);
-	INIT_LIST_HEAD(&acpi_desc->dimms);
-	mutex_init(&acpi_desc->spa_map_mutex);
-	mutex_init(&acpi_desc->init_mutex);
-
 	rc = acpi_nfit_init(acpi_desc, nfit_test->nfit_size);
 	if (rc) {
 		nvdimm_bus_unregister(acpi_desc->nvdimm_bus);