[PATCH v3 20/21] nfit-test: manufactured NFITs for interface development

[Dan Williams]

Manually create and register NFITs to describe 2 topologies.  Topology1
is an advanced plausible configuration for BLK/PMEM aliased NVDIMMs.
Topology2 is an example configuration for current platforms that only
ship with a persistent address range.

 Kernel provider "nfit_test.0" produces an NFIT with the following attributes:

                              (a)               (b)           DIMM   BLK-REGION
           +-------------------+--------+--------+--------+
 +------+  |       pm0.0       | blk2.0 | pm1.0  | blk2.1 |    0      region2
 | imc0 +--+- - - region0- - - +--------+        +--------+
 +--+---+  |       pm0.0       | blk3.0 | pm1.0  | blk3.1 |    1      region3
    |      +-------------------+--------v        v--------+
 +--+---+                               |                 |
 | cpu0 |                                     region1
 +--+---+                               |                 |
    |      +----------------------------^        ^--------+
 +--+---+  |           blk4.0           | pm1.0  | blk4.0 |    2      region4
 | imc1 +--+----------------------------|        +--------+
 +------+  |           blk5.0           | pm1.0  | blk5.0 |    3      region5
           +----------------------------+--------+--------+

 *) In this layout we have four dimms and two memory controllers in one
    socket.  Each unique interface ("block" or "pmem") to DPA space
    is identified by a region device with a dynamically assigned id.

 *) The first portion of dimm0 and dimm1 are interleaved as REGION0.
    A single "pmem" namespace is created in the REGION0-"spa"-range
    that spans dimm0 and dimm1 with a user-specified name of "pm0.0".
    Some of that interleaved "spa" range is reclaimed as "bdw"
    accessed space starting at offset (a) into each dimm.  In that
    reclaimed space we create two "bdw" "namespaces" from REGION2 and
    REGION3 where "blk2.0" and "blk3.0" are just human readable names
    that could be set to any user-desired name in the label.

 *) In the last portion of dimm0 and dimm1 we have an interleaved
    "spa" range, REGION1, that spans those two dimms as well as dimm2
    and dimm3.  Some of REGION1 allocated to a "pmem" namespace named
    "pm1.0" the rest is reclaimed in 4 "bdw" namespaces (for each
    dimm in the interleave set), "blk2.1", "blk3.1", "blk4.0", and
    "blk5.0".

 *) The portion of dimm2 and dimm3 that do not participate in the
    REGION1 interleaved "spa" range (i.e. the DPA address below
    offset (b) are also included in the "blk4.0" and "blk5.0"
    namespaces.  Note, that this example shows that "bdw" namespaces
    don't need to be contiguous in DPA-space.

 Kernel provider "nfit_test.1" produces an NFIT with the following attributes:

 region2
 +---------------------+
 |---------------------|
 ||       pm2.0       ||
 |---------------------|
 +---------------------+

 *) Describes a simple system-physical-address range with no backing
    dimm or interleave description.

Cc: <linux-acpi@xxxxxxxxxxxxxxx>
Cc: Lv Zheng <lv.zheng@xxxxxxxxx>
Cc: Robert Moore <robert.moore@xxxxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
 drivers/acpi/nfit.c               |    6 
 drivers/acpi/nfit.h               |   12 
 drivers/block/nd/Kconfig          |   22 +
 drivers/block/nd/Makefile         |    9 
 drivers/block/nd/test/Makefile    |    5 
 drivers/block/nd/test/iomap.c     |  151 +++++
 drivers/block/nd/test/nfit.c      | 1171 +++++++++++++++++++++++++++++++++++++
 drivers/block/nd/test/nfit_test.h |   28 +
 8 files changed, 1402 insertions(+), 2 deletions(-)
 create mode 100644 drivers/block/nd/test/Makefile
 create mode 100644 drivers/block/nd/test/iomap.c
 create mode 100644 drivers/block/nd/test/nfit.c
 create mode 100644 drivers/block/nd/test/nfit_test.h

diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index c4ce498da9eb..1efbd01d4860 100644
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -29,10 +29,11 @@ MODULE_PARM_DESC(force_enable_dimms, "Ignore _STA (ACPI DIMM device) status");
 
 static u8 nfit_uuid[NFIT_UUID_MAX][16];
 
-static const u8 *to_nfit_uuid(enum nfit_uuids id)
+const u8 *to_nfit_uuid(enum nfit_uuids id)
 {
 	return nfit_uuid[id];
 }
+EXPORT_SYMBOL(to_nfit_uuid);
 
 static struct acpi_nfit_desc *to_acpi_nfit_desc(struct nd_bus_descriptor *nd_desc)
 {
@@ -1330,7 +1331,7 @@ static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc)
 	return 0;
 }
 
-static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
+int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
 {
 	struct device *dev = acpi_desc->dev;
 	const void *end;
@@ -1369,6 +1370,7 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
 
 	return acpi_nfit_register_regions(acpi_desc);
 }
+EXPORT_SYMBOL_GPL(acpi_nfit_init);
 
 static int acpi_nfit_add(struct acpi_device *adev)
 {
diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index 1fc49cc51d4a..eedbd3d79e02 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -37,6 +37,15 @@ enum nfit_uuids {
 	NFIT_UUID_MAX,
 };
 
+#define NFIT_DIMM_HANDLE(node, socket, imc, chan, dimm) \
+       (((node & 0xfff) << 16) | ((socket & 0xf) << 12) \
+        | ((imc & 0xf) << 8) | ((chan & 0xf) << 4) | (dimm & 0xf))
+#define NFIT_DIMM_NODE(handle) ((handle) >> 16 & 0xfff)
+#define NFIT_DIMM_SOCKET(handle) ((handle) >> 12 & 0xf)
+#define NFIT_DIMM_CHAN(handle) ((handle) >> 8 & 0xf)
+#define NFIT_DIMM_IMC(handle) ((handle) >> 4 & 0xf)
+#define NFIT_DIMM_DIMM(handle) ((handle) & 0xf)
+
 struct nfit_spa {
 	struct acpi_nfit_system_address *spa;
 	struct list_head list;
@@ -145,4 +154,7 @@ static inline struct acpi_nfit_desc *to_acpi_desc(struct nd_bus_descriptor *nd_d
 {
 	return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
 }
+
+const u8 *to_nfit_uuid(enum nfit_uuids id);
+int acpi_nfit_init(struct acpi_nfit_desc *nfit, acpi_size sz);
 #endif /* __NFIT_H__ */
diff --git a/drivers/block/nd/Kconfig b/drivers/block/nd/Kconfig
index f97bf0db6519..5f2935aefd41 100644
--- a/drivers/block/nd/Kconfig
+++ b/drivers/block/nd/Kconfig
@@ -17,6 +17,28 @@ if ND_DEVICES
 config LIBND
 	tristate
 
+config NFIT_TEST
+	tristate "NFIT TEST: Manufactured NFIT for interface testing"
+	default n
+	depends on EXPERT
+	depends on DMA_CMA
+	depends on LIBND=m
+	depends on ACPI_NFIT
+	depends on m
+	help
+	  For development purposes register a manufactured
+	  NFIT table to verify the resulting device model topology.
+	  Note, this module arranges for ioremap_cache() to be
+	  overridden locally to allow simulation of system-memory as an
+	  io-memory-resource.
+
+	  Note, this test expects to be able to find at least 256MB of
+	  contiguous DMA space (CONFIG_CMA_SIZE_MBYTES, cma=) or it
+	  will fail to load.  This much contiguos memory is needed to
+	  properly simulate a DAX capable memory region.
+
+	  Say N unless you are doing development of the 'libnd' subsystem.
+
 config BLK_DEV_PMEM
 	tristate "PMEM: Persistent memory block device support"
 	depends on LIBND
diff --git a/drivers/block/nd/Makefile b/drivers/block/nd/Makefile
index 29a797686429..e1e0f01ae960 100644
--- a/drivers/block/nd/Makefile
+++ b/drivers/block/nd/Makefile
@@ -1,4 +1,13 @@
+ifdef CONFIG_NFIT_TEST
+ldflags-y += --wrap=ioremap_cache
+ldflags-y += --wrap=ioremap_nocache
+ldflags-y += --wrap=iounmap
+ldflags-y += --wrap=__request_region
+ldflags-y += --wrap=__release_region
+endif
+
 obj-$(CONFIG_LIBND) += libnd.o
+obj-$(CONFIG_NFIT_TEST) += test/
 obj-$(CONFIG_BLK_DEV_PMEM) += nd_pmem.o
 obj-$(CONFIG_ND_BTT) += nd_btt.o
 obj-$(CONFIG_ND_BLK) += nd_blk.o
diff --git a/drivers/block/nd/test/Makefile b/drivers/block/nd/test/Makefile
new file mode 100644
index 000000000000..c7f319cbd082
--- /dev/null
+++ b/drivers/block/nd/test/Makefile
@@ -0,0 +1,5 @@
+obj-$(CONFIG_NFIT_TEST) += nfit_test.o
+obj-$(CONFIG_NFIT_TEST) += nfit_test_iomap.o
+
+nfit_test-y := nfit.o
+nfit_test_iomap-y := iomap.o
diff --git a/drivers/block/nd/test/iomap.c b/drivers/block/nd/test/iomap.c
new file mode 100644
index 000000000000..c85a6f6ba559
--- /dev/null
+++ b/drivers/block/nd/test/iomap.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#include <linux/rculist.h>
+#include <linux/export.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include "nfit_test.h"
+
+static LIST_HEAD(iomap_head);
+
+static struct iomap_ops {
+	nfit_test_lookup_fn nfit_test_lookup;
+	struct list_head list;
+} iomap_ops = {
+	.list = LIST_HEAD_INIT(iomap_ops.list),
+};
+
+void nfit_test_setup(nfit_test_lookup_fn lookup)
+{
+	iomap_ops.nfit_test_lookup = lookup;
+	list_add_rcu(&iomap_ops.list, &iomap_head);
+}
+EXPORT_SYMBOL(nfit_test_setup);
+
+void nfit_test_teardown(void)
+{
+	list_del_rcu(&iomap_ops.list);
+	synchronize_rcu();
+}
+EXPORT_SYMBOL(nfit_test_teardown);
+
+static struct nfit_test_resource *get_nfit_res(resource_size_t resource)
+{
+	struct iomap_ops *ops;
+
+	ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
+	if (ops)
+		return ops->nfit_test_lookup(resource);
+	return NULL;
+}
+
+void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
+		void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
+{
+	struct nfit_test_resource *nfit_res;
+
+	rcu_read_lock();
+	nfit_res = get_nfit_res(offset);
+	rcu_read_unlock();
+	if (nfit_res)
+		return (void __iomem *) nfit_res->buf + offset
+			- nfit_res->res->start;
+	return fallback_fn(offset, size);
+}
+
+void __iomem *__wrap_ioremap_cache(resource_size_t offset, unsigned long size)
+{
+	return __nfit_test_ioremap(offset, size, ioremap_cache);
+}
+EXPORT_SYMBOL(__wrap_ioremap_cache);
+
+void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
+{
+	return __nfit_test_ioremap(offset, size, ioremap_nocache);
+}
+EXPORT_SYMBOL(__wrap_ioremap_nocache);
+
+void __wrap_iounmap(volatile void __iomem *addr)
+{
+	struct nfit_test_resource *nfit_res;
+
+	rcu_read_lock();
+	nfit_res = get_nfit_res((unsigned long) addr);
+	rcu_read_unlock();
+	if (nfit_res)
+		return;
+	return iounmap(addr);
+}
+EXPORT_SYMBOL(__wrap_iounmap);
+
+struct resource *__wrap___request_region(struct resource *parent,
+		resource_size_t start, resource_size_t n, const char *name,
+		int flags)
+{
+	struct nfit_test_resource *nfit_res;
+
+	if (parent == &iomem_resource) {
+		rcu_read_lock();
+		nfit_res = get_nfit_res(start);
+		rcu_read_unlock();
+		if (nfit_res) {
+			struct resource *res = nfit_res->res + 1;
+
+			if (start + n > nfit_res->res->start
+					+ resource_size(nfit_res->res)) {
+				pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
+						__func__, start, n,
+						nfit_res->res);
+				return NULL;
+			}
+
+			res->start = start;
+			res->end = start + n - 1;
+			res->name = name;
+			res->flags = resource_type(parent);
+			res->flags |= IORESOURCE_BUSY | flags;
+			pr_debug("%s: %pr\n", __func__, res);
+			return res;
+		}
+	}
+	return __request_region(parent, start, n, name, flags);
+}
+EXPORT_SYMBOL(__wrap___request_region);
+
+void __wrap___release_region(struct resource *parent, resource_size_t start,
+				resource_size_t n)
+{
+	struct nfit_test_resource *nfit_res;
+
+	if (parent == &iomem_resource) {
+		rcu_read_lock();
+		nfit_res = get_nfit_res(start);
+		rcu_read_unlock();
+		if (nfit_res) {
+			struct resource *res = nfit_res->res + 1;
+
+			if (start != res->start || resource_size(res) != n)
+				pr_info("%s: start: %llx n: %llx mismatch: %pr\n",
+						__func__, start, n, res);
+			else
+				memset(res, 0, sizeof(*res));
+			return;
+		}
+	}
+	__release_region(parent, start, n);
+}
+EXPORT_SYMBOL(__wrap___release_region);
+
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/block/nd/test/nfit.c b/drivers/block/nd/test/nfit.c
new file mode 100644
index 000000000000..973e46c06abc
--- /dev/null
+++ b/drivers/block/nd/test/nfit.c
@@ -0,0 +1,1171 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/libnd.h>
+#include <linux/ndctl.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include "../../../acpi/nfit.h"
+#include "nfit_test.h"
+#include "../nd.h"
+
+/*
+ * Generate an NFIT table to describe the following topology:
+ *
+ * BUS0: Interleaved PMEM regions, and aliasing with BLK regions
+ *
+ *                     (a)                       (b)            DIMM   BLK-REGION
+ *           +----------+--------------+----------+---------+
+ * +------+  |  blk2.0  |     pm0.0    |  blk2.1  |  pm1.0  |    0      region2
+ * | imc0 +--+- - - - - region0 - - - -+----------+         +
+ * +--+---+  |  blk3.0  |     pm0.0    |  blk3.1  |  pm1.0  |    1      region3
+ *    |      +----------+--------------v----------v         v
+ * +--+---+                            |                    |
+ * | cpu0 |                                    region1
+ * +--+---+                            |                    |
+ *    |      +-------------------------^----------^         ^
+ * +--+---+  |                 blk4.0             |  pm1.0  |    2      region4
+ * | imc1 +--+-------------------------+----------+         +
+ * +------+  |                 blk5.0             |  pm1.0  |    3      region5
+ *           +-------------------------+----------+-+-------+
+ *
+ * *) In this layout we have four dimms and two memory controllers in one
+ *    socket.  Each unique interface (BLK or PMEM) to DPA space
+ *    is identified by a region device with a dynamically assigned id.
+ *
+ * *) The first portion of dimm0 and dimm1 are interleaved as REGION0.
+ *    A single PMEM namespace "pm0.0" is created using half of the
+ *    REGION0 SPA-range.  REGION0 spans dimm0 and dimm1.  PMEM namespace
+ *    allocate from from the bottom of a region.  The unallocated
+ *    portion of REGION0 aliases with REGION2 and REGION3.  That
+ *    unallacted capacity is reclaimed as BLK namespaces ("blk2.0" and
+ *    "blk3.0") starting at the base of each DIMM to offset (a) in those
+ *    DIMMs.  "pm0.0", "blk2.0" and "blk3.0" are free-form readable
+ *    names that can be assigned to a namespace.
+ *
+ * *) In the last portion of dimm0 and dimm1 we have an interleaved
+ *    SPA range, REGION1, that spans those two dimms as well as dimm2
+ *    and dimm3.  Some of REGION1 allocated to a PMEM namespace named
+ *    "pm1.0" the rest is reclaimed in 4 BLK namespaces (for each
+ *    dimm in the interleave set), "blk2.1", "blk3.1", "blk4.0", and
+ *    "blk5.0".
+ *
+ * *) The portion of dimm2 and dimm3 that do not participate in the
+ *    REGION1 interleaved SPA range (i.e. the DPA address below offset
+ *    (b) are also included in the "blk4.0" and "blk5.0" namespaces.
+ *    Note, that BLK namespaces need not be contiguous in DPA-space, and
+ *    can consume aliased capacity from multiple interleave sets.
+ *
+ * BUS1: Legacy NVDIMM (single contiguous range)
+ *
+ *  region2
+ * +---------------------+
+ * |---------------------|
+ * ||       pm2.0       ||
+ * |---------------------|
+ * +---------------------+
+ *
+ * *) A NFIT-table may describe a simple system-physical-address range
+ *    with no BLK aliasing.  This type of region may optionally
+ *    reference an NVDIMM.
+ */
+enum {
+	NUM_PM  = 2,
+	NUM_DCR = 4,
+	NUM_BDW = NUM_DCR,
+	NUM_SPA = NUM_PM + NUM_DCR + NUM_BDW,
+	NUM_MEM = NUM_DCR + NUM_BDW + 2 /* spa0 iset */ + 4 /* spa1 iset */,
+	DIMM_SIZE = SZ_32M,
+	LABEL_SIZE = SZ_128K,
+	SPA0_SIZE = DIMM_SIZE,
+	SPA1_SIZE = DIMM_SIZE*2,
+	SPA2_SIZE = DIMM_SIZE,
+	BDW_SIZE = 64 << 8,
+	DCR_SIZE = 12,
+	NUM_NFITS = 2, /* permit testing multiple NFITs per system */
+};
+
+struct nfit_test_dcr {
+	__le64 bdw_addr;
+	__le32 bdw_status;
+	__u8 aperature[BDW_SIZE];
+};
+
+static u32 handle[NUM_DCR] = {
+	[0] = NFIT_DIMM_HANDLE(0, 0, 0, 0, 0),
+	[1] = NFIT_DIMM_HANDLE(0, 0, 0, 0, 1),
+	[2] = NFIT_DIMM_HANDLE(0, 0, 1, 0, 0),
+	[3] = NFIT_DIMM_HANDLE(0, 0, 1, 0, 1),
+};
+
+struct nfit_test {
+	struct acpi_nfit_desc acpi_desc;
+	struct platform_device pdev;
+	struct list_head resources;
+	void *nfit_buf;
+	dma_addr_t nfit_dma;
+	size_t nfit_size;
+	int num_dcr;
+	int num_pm;
+	void **dimm;
+	dma_addr_t *dimm_dma;
+	void **label;
+	dma_addr_t *label_dma;
+	void **spa_set;
+	dma_addr_t *spa_set_dma;
+	struct nfit_test_dcr **dcr;
+	dma_addr_t *dcr_dma;
+	int (*alloc)(struct nfit_test *t);
+	void (*setup)(struct nfit_test *t);
+};
+
+static struct nfit_test *to_nfit_test(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	return container_of(pdev, struct nfit_test, pdev);
+}
+
+static int nfit_test_ctl(struct nd_bus_descriptor *nd_desc,
+		struct nd_dimm *nd_dimm, unsigned int cmd, void *buf,
+		unsigned int buf_len)
+{
+	struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
+	struct nfit_test *t = container_of(acpi_desc, typeof(*t), acpi_desc);
+	struct nfit_mem *nfit_mem = nd_dimm_provider_data(nd_dimm);
+	int i, rc;
+
+	if (!nfit_mem || !test_bit(cmd, &nfit_mem->dsm_mask))
+		return -ENXIO;
+
+	/* lookup label space for the given dimm */
+	for (i = 0; i < ARRAY_SIZE(handle); i++)
+		if (__to_nfit_memdev(nfit_mem)->device_handle == handle[i])
+			break;
+	if (i >= ARRAY_SIZE(handle))
+		return -ENXIO;
+
+	switch (cmd) {
+	case ND_CMD_GET_CONFIG_SIZE: {
+		struct nd_cmd_get_config_size *nd_cmd = buf;
+
+		if (buf_len < sizeof(*nd_cmd))
+			return -EINVAL;
+		nd_cmd->status = 0;
+		nd_cmd->config_size = LABEL_SIZE;
+		nd_cmd->max_xfer = SZ_4K;
+		rc = 0;
+		break;
+	}
+	case ND_CMD_GET_CONFIG_DATA: {
+		struct nd_cmd_get_config_data_hdr *nd_cmd = buf;
+		unsigned int len, offset = nd_cmd->in_offset;
+
+		if (buf_len < sizeof(*nd_cmd))
+			return -EINVAL;
+		if (offset >= LABEL_SIZE)
+			return -EINVAL;
+		if (nd_cmd->in_length + sizeof(*nd_cmd) > buf_len)
+			return -EINVAL;
+
+		nd_cmd->status = 0;
+		len = min(nd_cmd->in_length, LABEL_SIZE - offset);
+		memcpy(nd_cmd->out_buf, t->label[i] + offset, len);
+		rc = buf_len - sizeof(*nd_cmd) - len;
+		break;
+	}
+	case ND_CMD_SET_CONFIG_DATA: {
+		struct nd_cmd_set_config_hdr *nd_cmd = buf;
+		unsigned int len, offset = nd_cmd->in_offset;
+		u32 *status;
+
+		if (buf_len < sizeof(*nd_cmd))
+			return -EINVAL;
+		if (offset >= LABEL_SIZE)
+			return -EINVAL;
+		if (nd_cmd->in_length + sizeof(*nd_cmd) + 4 > buf_len)
+			return -EINVAL;
+
+		status = buf + nd_cmd->in_length + sizeof(*nd_cmd);
+		*status = 0;
+		len = min(nd_cmd->in_length, LABEL_SIZE - offset);
+		memcpy(t->label[i] + offset, nd_cmd->in_buf, len);
+		rc = buf_len - sizeof(*nd_cmd) - (len + 4);
+		break;
+	}
+	default:
+		return -ENOTTY;
+	}
+
+	return rc;
+}
+
+static DEFINE_SPINLOCK(nfit_test_lock);
+static struct nfit_test *instances[NUM_NFITS];
+
+static void release_nfit_res(void *data)
+{
+	struct nfit_test_resource *nfit_res = data;
+	struct resource *res = nfit_res->res;
+
+	spin_lock(&nfit_test_lock);
+	list_del(&nfit_res->list);
+	spin_unlock(&nfit_test_lock);
+
+	if (is_vmalloc_addr(nfit_res->buf))
+		vfree(nfit_res->buf);
+	else
+		dma_free_coherent(nfit_res->dev, resource_size(res),
+				nfit_res->buf, res->start);
+	kfree(res);
+	kfree(nfit_res);
+}
+
+static void *__test_alloc(struct nfit_test *t, size_t size, dma_addr_t *dma,
+		void *buf)
+{
+	struct device *dev = &t->pdev.dev;
+	struct resource *res = kzalloc(sizeof(*res) * 2, GFP_KERNEL);
+	struct nfit_test_resource *nfit_res = kzalloc(sizeof(*nfit_res),
+			GFP_KERNEL);
+	int rc;
+
+	if (!res || !buf || !nfit_res)
+		goto err;
+	rc = devm_add_action(dev, release_nfit_res, nfit_res);
+	if (rc)
+		goto err;
+	INIT_LIST_HEAD(&nfit_res->list);
+	memset(buf, 0, size);
+	nfit_res->dev = dev;
+	nfit_res->buf = buf;
+	nfit_res->res = res;
+	res->start = *dma;
+	res->end = *dma + size - 1;
+	res->name = "NFIT";
+	spin_lock(&nfit_test_lock);
+	list_add(&nfit_res->list, &t->resources);
+	spin_unlock(&nfit_test_lock);
+
+	return nfit_res->buf;
+ err:
+	if (buf && !is_vmalloc_addr(buf))
+		dma_free_coherent(dev, size, buf, *dma);
+	else if (buf)
+		vfree(buf);
+	kfree(res);
+	kfree(nfit_res);
+	return NULL;
+}
+
+static void *test_alloc(struct nfit_test *t, size_t size, dma_addr_t *dma)
+{
+	void *buf = vmalloc(size);
+
+	*dma = (unsigned long) buf;
+	return __test_alloc(t, size, dma, buf);
+}
+
+static void *test_alloc_coherent(struct nfit_test *t, size_t size, dma_addr_t *dma)
+{
+	struct device *dev = &t->pdev.dev;
+	void *buf = dma_alloc_coherent(dev, size, dma, GFP_KERNEL);
+
+	return __test_alloc(t, size, dma, buf);
+}
+
+static struct nfit_test_resource *nfit_test_lookup(resource_size_t addr)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(instances); i++) {
+		struct nfit_test_resource *n, *nfit_res = NULL;
+		struct nfit_test *t = instances[i];
+
+		if (!t)
+			continue;
+		spin_lock(&nfit_test_lock);
+		list_for_each_entry(n, &t->resources, list) {
+			if (addr >= n->res->start && (addr < n->res->start
+						+ resource_size(n->res))) {
+				nfit_res = n;
+				break;
+			} else if (addr >= (unsigned long) n->buf
+					&& (addr < (unsigned long) n->buf
+						+ resource_size(n->res))) {
+				nfit_res = n;
+				break;
+			}
+		}
+		spin_unlock(&nfit_test_lock);
+		if (nfit_res)
+			return nfit_res;
+	}
+
+	return NULL;
+}
+
+static int nfit_test0_alloc(struct nfit_test *t)
+{
+	size_t nfit_size = sizeof(struct acpi_table_nfit)
+			+ sizeof(struct acpi_nfit_system_address) * NUM_SPA
+			+ sizeof(struct acpi_nfit_memory_map) * NUM_MEM
+			+ sizeof(struct acpi_nfit_control_region) * NUM_DCR
+			+ sizeof(struct acpi_nfit_data_region) * NUM_BDW;
+	int i;
+
+	t->nfit_buf = test_alloc(t, nfit_size, &t->nfit_dma);
+	if (!t->nfit_buf)
+		return -ENOMEM;
+	t->nfit_size = nfit_size;
+
+	t->spa_set[0] = test_alloc_coherent(t, SPA0_SIZE, &t->spa_set_dma[0]);
+	if (!t->spa_set[0])
+		return -ENOMEM;
+
+	t->spa_set[1] = test_alloc_coherent(t, SPA1_SIZE, &t->spa_set_dma[1]);
+	if (!t->spa_set[1])
+		return -ENOMEM;
+
+	for (i = 0; i < NUM_DCR; i++) {
+		t->dimm[i] = test_alloc(t, DIMM_SIZE, &t->dimm_dma[i]);
+		if (!t->dimm[i])
+			return -ENOMEM;
+
+		t->label[i] = test_alloc(t, LABEL_SIZE, &t->label_dma[i]);
+		if (!t->label[i])
+			return -ENOMEM;
+		sprintf(t->label[i], "label%d", i);
+	}
+
+	for (i = 0; i < NUM_DCR; i++) {
+		t->dcr[i] = test_alloc(t, LABEL_SIZE, &t->dcr_dma[i]);
+		if (!t->dcr[i])
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static int nfit_test1_alloc(struct nfit_test *t)
+{
+	size_t nfit_size = sizeof(struct acpi_table_nfit)
+		+ sizeof(struct acpi_nfit_system_address) + sizeof(struct acpi_nfit_memory_map)
+		+ sizeof(struct acpi_nfit_control_region);
+
+	t->nfit_buf = test_alloc(t, nfit_size, &t->nfit_dma);
+	if (!t->nfit_buf)
+		return -ENOMEM;
+	t->nfit_size = nfit_size;
+
+	t->spa_set[0] = test_alloc_coherent(t, SPA2_SIZE, &t->spa_set_dma[0]);
+	if (!t->spa_set[0])
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void nfit_test_init_header(struct acpi_table_nfit *nfit, size_t size)
+{
+	memcpy(nfit->header.signature, ACPI_SIG_NFIT, 4);
+	nfit->header.length = size;
+	nfit->header.revision = 1;
+	memcpy(nfit->header.oem_id, "LIBND", 6);
+	memcpy(nfit->header.oem_table_id, "TEST", 5);
+	nfit->header.oem_revision = 1;
+	memcpy(nfit->header.asl_compiler_id, "TST", 4);
+	nfit->header.asl_compiler_revision = 1;
+}
+
+static void nfit_test0_setup(struct nfit_test *t)
+{
+	struct nd_bus_descriptor *nd_desc;
+	struct acpi_nfit_desc *acpi_desc;
+	struct acpi_nfit_memory_map *memdev;
+	void *nfit_buf = t->nfit_buf;
+	size_t size = t->nfit_size;
+	struct acpi_nfit_system_address *spa;
+	struct acpi_nfit_control_region *dcr;
+	struct acpi_nfit_data_region *bdw;
+	unsigned int offset;
+
+	nfit_test_init_header(nfit_buf, size);
+
+	/*
+	 * spa0 (interleave first half of dimm0 and dimm1, note storage
+	 * does not actually alias the related block-data-window
+	 * regions)
+	 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit);
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16);
+	spa->range_index = 0+1;
+	spa->address = t->spa_set_dma[0];
+	spa->length = SPA0_SIZE;
+
+	/*
+	 * spa1 (interleave last half of the 4 DIMMS, note storage
+	 * does not actually alias the related block-data-window
+	 * regions)
+	 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa);
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16);
+	spa->range_index = 1+1;
+	spa->address = t->spa_set_dma[1];
+	spa->length = SPA1_SIZE;
+
+	/* spa2 (dcr0) dimm0 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 2;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+	spa->range_index = 2+1;
+	spa->address = t->dcr_dma[0];
+	spa->length = DCR_SIZE;
+
+	/* spa3 (dcr1) dimm1 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 3;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+	spa->range_index = 3+1;
+	spa->address = t->dcr_dma[1];
+	spa->length = DCR_SIZE;
+
+	/* spa4 (dcr2) dimm2 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 4;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+	spa->range_index = 4+1;
+	spa->address = t->dcr_dma[2];
+	spa->length = DCR_SIZE;
+
+	/* spa5 (dcr3) dimm3 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 5;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_DCR), 16);
+	spa->range_index = 5+1;
+	spa->address = t->dcr_dma[3];
+	spa->length = DCR_SIZE;
+
+	/* spa6 (bdw for dcr0) dimm0 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 6;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+	spa->range_index = 6+1;
+	spa->address = t->dimm_dma[0];
+	spa->length = DIMM_SIZE;
+
+	/* spa7 (bdw for dcr1) dimm1 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 7;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+	spa->range_index = 7+1;
+	spa->address = t->dimm_dma[1];
+	spa->length = DIMM_SIZE;
+
+	/* spa8 (bdw for dcr2) dimm2 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 8;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+	spa->range_index = 8+1;
+	spa->address = t->dimm_dma[2];
+	spa->length = DIMM_SIZE;
+
+	/* spa9 (bdw for dcr3) dimm3 */
+	spa = nfit_buf + sizeof(struct acpi_table_nfit) + sizeof(*spa) * 9;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_BDW), 16);
+	spa->range_index = 9+1;
+	spa->address = t->dimm_dma[3];
+	spa->length = DIMM_SIZE;
+
+	offset = sizeof(struct acpi_table_nfit) + sizeof(*spa) * 10;
+	/* mem-region0 (spa0, dimm0) */
+	memdev = nfit_buf + offset;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[0];
+	memdev->physical_id = 0;
+	memdev->region_id = 0;
+	memdev->range_index = 0+1;
+	memdev->region_index = 0+1;
+	memdev->region_size = SPA0_SIZE/2;
+	memdev->region_offset = t->spa_set_dma[0];
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 2;
+
+	/* mem-region1 (spa0, dimm1) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map);
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[1];
+	memdev->physical_id = 1;
+	memdev->region_id = 0;
+	memdev->range_index = 0+1;
+	memdev->region_index = 1+1;
+	memdev->region_size = SPA0_SIZE/2;
+	memdev->region_offset = t->spa_set_dma[0] + SPA0_SIZE/2;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 2;
+
+	/* mem-region2 (spa1, dimm0) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 2;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[0];
+	memdev->physical_id = 0;
+	memdev->region_id = 1;
+	memdev->range_index = 1+1;
+	memdev->region_index = 0+1;
+	memdev->region_size = SPA1_SIZE/4;
+	memdev->region_offset = t->spa_set_dma[1];
+	memdev->address = SPA0_SIZE/2;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 4;
+
+	/* mem-region3 (spa1, dimm1) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 3;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[1];
+	memdev->physical_id = 1;
+	memdev->region_id = 1;
+	memdev->range_index = 1+1;
+	memdev->region_index = 1+1;
+	memdev->region_size = SPA1_SIZE/4;
+	memdev->region_offset = t->spa_set_dma[1] + SPA1_SIZE/4;
+	memdev->address = SPA0_SIZE/2;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 4;
+
+	/* mem-region4 (spa1, dimm2) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 4;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[2];
+	memdev->physical_id = 2;
+	memdev->region_id = 0;
+	memdev->range_index = 1+1;
+	memdev->region_index = 2+1;
+	memdev->region_size = SPA1_SIZE/4;
+	memdev->region_offset = t->spa_set_dma[1] + 2*SPA1_SIZE/4;
+	memdev->address = SPA0_SIZE/2;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 4;
+
+	/* mem-region5 (spa1, dimm3) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 5;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[3];
+	memdev->physical_id = 3;
+	memdev->region_id = 0;
+	memdev->range_index = 1+1;
+	memdev->region_index = 3+1;
+	memdev->region_size = SPA1_SIZE/4;
+	memdev->region_offset = t->spa_set_dma[1] + 3*SPA1_SIZE/4;
+	memdev->address = SPA0_SIZE/2;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 4;
+
+	/* mem-region6 (spa/dcr0, dimm0) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 6;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[0];
+	memdev->physical_id = 0;
+	memdev->region_id = 0;
+	memdev->range_index = 2+1;
+	memdev->region_index = 0+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region7 (spa/dcr1, dimm1) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 7;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[1];
+	memdev->physical_id = 1;
+	memdev->region_id = 0;
+	memdev->range_index = 3+1;
+	memdev->region_index = 1+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region8 (spa/dcr2, dimm2) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 8;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[2];
+	memdev->physical_id = 2;
+	memdev->region_id = 0;
+	memdev->range_index = 4+1;
+	memdev->region_index = 2+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region9 (spa/dcr3, dimm3) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 9;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[3];
+	memdev->physical_id = 3;
+	memdev->region_id = 0;
+	memdev->range_index = 5+1;
+	memdev->region_index = 3+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region10 (spa/bdw0, dimm0) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 10;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[0];
+	memdev->physical_id = 0;
+	memdev->region_id = 0;
+	memdev->range_index = 6+1;
+	memdev->region_index = 0+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region11 (spa/bdw1, dimm1) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 11;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[1];
+	memdev->physical_id = 1;
+	memdev->region_id = 0;
+	memdev->range_index = 7+1;
+	memdev->region_index = 1+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region12 (spa/bdw2, dimm2) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 12;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[2];
+	memdev->physical_id = 2;
+	memdev->region_id = 0;
+	memdev->range_index = 8+1;
+	memdev->region_index = 2+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	/* mem-region13 (spa/dcr3, dimm3) */
+	memdev = nfit_buf + offset + sizeof(struct acpi_nfit_memory_map) * 13;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = handle[3];
+	memdev->physical_id = 3;
+	memdev->region_id = 0;
+	memdev->range_index = 9+1;
+	memdev->region_index = 3+1;
+	memdev->region_size = 0;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	offset = offset + sizeof(struct acpi_nfit_memory_map) * 14;
+	/* dcr-descriptor0 */
+	dcr = nfit_buf + offset;
+	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+	dcr->header.length = sizeof(struct acpi_nfit_control_region);
+	dcr->region_index = 0+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[0];
+	dcr->windows = 1;
+	dcr->window_size = DCR_SIZE;
+	dcr->command_offset = 0;
+	dcr->command_size = 8;
+	dcr->status_offset = 8;
+	dcr->status_size = 4;
+
+	/* dcr-descriptor1 */
+	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);
+	dcr->region_index = 1+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[1];
+	dcr->windows = 1;
+	dcr->window_size = DCR_SIZE;
+	dcr->command_offset = 0;
+	dcr->command_size = 8;
+	dcr->status_offset = 8;
+	dcr->status_size = 4;
+
+	/* dcr-descriptor2 */
+	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);
+	dcr->region_index = 2+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[2];
+	dcr->windows = 1;
+	dcr->window_size = DCR_SIZE;
+	dcr->command_offset = 0;
+	dcr->command_size = 8;
+	dcr->status_offset = 8;
+	dcr->status_size = 4;
+
+	/* dcr-descriptor3 */
+	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);
+	dcr->region_index = 3+1;
+	dcr->vendor_id = 0xabcd;
+	dcr->device_id = 0;
+	dcr->revision_id = 1;
+	dcr->serial_number = ~handle[3];
+	dcr->windows = 1;
+	dcr->window_size = DCR_SIZE;
+	dcr->command_offset = 0;
+	dcr->command_size = 8;
+	dcr->status_offset = 8;
+	dcr->status_size = 4;
+
+	offset = offset + sizeof(struct acpi_nfit_control_region) * 4;
+	/* bdw0 (spa/dcr0, dimm0) */
+	bdw = nfit_buf + offset;
+	bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+	bdw->header.length = sizeof(struct acpi_nfit_data_region);
+	bdw->region_index = 0+1;
+	bdw->windows = 1;
+	bdw->offset = 0;
+	bdw->size = BDW_SIZE;
+	bdw->capacity = DIMM_SIZE;
+	bdw->start_address = 0;
+
+	/* bdw1 (spa/dcr1, dimm1) */
+	bdw = nfit_buf + offset + sizeof(struct acpi_nfit_data_region);
+	bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+	bdw->header.length = sizeof(struct acpi_nfit_data_region);
+	bdw->region_index = 1+1;
+	bdw->windows = 1;
+	bdw->offset = 0;
+	bdw->size = BDW_SIZE;
+	bdw->capacity = DIMM_SIZE;
+	bdw->start_address = 0;
+
+	/* bdw2 (spa/dcr2, dimm2) */
+	bdw = nfit_buf + offset + sizeof(struct acpi_nfit_data_region) * 2;
+	bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+	bdw->header.length = sizeof(struct acpi_nfit_data_region);
+	bdw->region_index = 2+1;
+	bdw->windows = 1;
+	bdw->offset = 0;
+	bdw->size = BDW_SIZE;
+	bdw->capacity = DIMM_SIZE;
+	bdw->start_address = 0;
+
+	/* bdw3 (spa/dcr3, dimm3) */
+	bdw = nfit_buf + offset + sizeof(struct acpi_nfit_data_region) * 3;
+	bdw->header.type = ACPI_NFIT_TYPE_DATA_REGION;
+	bdw->header.length = sizeof(struct acpi_nfit_data_region);
+	bdw->region_index = 3+1;
+	bdw->windows = 1;
+	bdw->offset = 0;
+	bdw->size = BDW_SIZE;
+	bdw->capacity = DIMM_SIZE;
+	bdw->start_address = 0;
+
+	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);
+	set_bit(ND_CMD_SET_CONFIG_DATA, &acpi_desc->dimm_dsm_force_en);
+	nd_desc = &acpi_desc->nd_desc;
+	nd_desc->ndctl = nfit_test_ctl;
+}
+
+static void nfit_test1_setup(struct nfit_test *t)
+{
+	size_t size = t->nfit_size, offset;
+	void *nfit_buf = t->nfit_buf;
+	struct acpi_nfit_memory_map *memdev;
+	struct acpi_nfit_control_region *dcr;
+	struct acpi_nfit_system_address *spa;
+
+	nfit_test_init_header(nfit_buf, size);
+
+	offset = sizeof(struct acpi_table_nfit);
+	/* spa0 (flat range with no bdw aliasing) */
+	spa = nfit_buf + offset;
+	spa->header.type = ACPI_NFIT_TYPE_SYSTEM_ADDRESS;
+	spa->header.length = sizeof(*spa);
+	memcpy(spa->range_guid, to_nfit_uuid(NFIT_SPA_PM), 16);
+	spa->range_index = 0+1;
+	spa->address = t->spa_set_dma[0];
+	spa->length = SPA2_SIZE;
+
+	offset += sizeof(*spa);
+	/* mem-region0 (spa0, dimm0) */
+	memdev = nfit_buf + offset;
+	memdev->header.type = ACPI_NFIT_TYPE_MEMORY_MAP;
+	memdev->header.length = sizeof(*memdev);
+	memdev->device_handle = 0;
+	memdev->physical_id = 0;
+	memdev->region_id = 0;
+	memdev->range_index = 0+1;
+	memdev->region_index = 0+1;
+	memdev->region_size = SPA2_SIZE;
+	memdev->region_offset = 0;
+	memdev->address = 0;
+	memdev->interleave_index = 0;
+	memdev->interleave_ways = 1;
+
+	offset += sizeof(*memdev);
+	/* dcr-descriptor0 */
+	dcr = nfit_buf + offset;
+	dcr->header.type = ACPI_NFIT_TYPE_CONTROL_REGION;
+	dcr->header.length = sizeof(struct acpi_nfit_control_region);
+	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->windows = 0;
+	dcr->window_size = 0;
+	dcr->command_offset = 0;
+	dcr->command_size = 0;
+	dcr->status_offset = 0;
+	dcr->status_size = 0;
+}
+
+static int nfit_test_blk_region_enable(struct nd_bus *nd_bus, struct device *dev)
+{
+	struct nd_blk_region *ndbr = to_nd_blk_region(dev);
+	struct acpi_nfit_system_address *spa_bdw;
+	struct nfit_blk_mmio *mmio;
+	struct nfit_blk *nfit_blk;
+	struct nfit_mem *nfit_mem;
+	struct nd_dimm *nd_dimm;
+
+	nd_dimm = nd_blk_region_to_dimm(ndbr);
+	nfit_mem = nd_dimm_provider_data(nd_dimm);
+	if (!nfit_mem || !nfit_mem->dcr || !nfit_mem->bdw) {
+		dev_dbg(dev, "%s: missing%s%s%s\n", __func__,
+				nfit_mem ? "" : " nfit_mem",
+				nfit_mem->dcr ? "" : " dcr",
+				nfit_mem->bdw ? "" : " bdw");
+		return -ENXIO;
+	}
+
+	nfit_blk = devm_kzalloc(dev, sizeof(*nfit_blk), GFP_KERNEL);
+	if (!nfit_blk)
+		return -ENOMEM;
+	nd_blk_region_set_provider_data(ndbr, nfit_blk);
+	nfit_blk->nd_region = to_nd_region(dev);
+
+	/* block aperture memory is all we use in nfit_test */
+	nfit_blk->bdw_offset = nfit_mem->bdw->offset;
+	mmio = &nfit_blk->mmio[BDW];
+	spa_bdw = nfit_mem->spa_bdw;
+	mmio->base = __wrap_ioremap_nocache(spa_bdw->address, spa_bdw->length);
+	if (!mmio->base) {
+		release_mem_region(spa_bdw->address, spa_bdw->length);
+		dev_dbg(dev, "%s: %s failed to map bdw\n", __func__,
+				nd_dimm_name(nd_dimm));
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void nfit_test_blk_region_disable(struct nd_bus *nd_bus, struct device *dev)
+{
+	struct nd_blk_region *ndbr = to_nd_blk_region(dev);
+	struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
+	struct acpi_nfit_system_address *spa_bdw;
+	struct nfit_blk_mmio *mmio;
+	struct nfit_mem *nfit_mem;
+	struct nd_dimm *nd_dimm;
+
+	if (!nfit_blk)
+		return; /* never enabled */
+
+	nd_dimm = nd_blk_region_to_dimm(ndbr);
+	nfit_mem = nd_dimm_provider_data(nd_dimm);
+	spa_bdw = nfit_mem->spa_bdw;
+	mmio = &nfit_blk->mmio[BDW];
+	__wrap_iounmap(mmio->base);
+	nd_blk_region_set_provider_data(ndbr, NULL);
+}
+
+static int nfit_test_blk_do_io(struct nd_blk_region *ndbr, void *iobuf,
+                u64 len, int rw, resource_size_t dpa)
+{
+	struct nfit_blk *nfit_blk = ndbr->blk_provider_data;
+	struct nfit_blk_mmio *mmio = &nfit_blk->mmio[BDW];
+	struct nd_region *nd_region = &ndbr->nd_region;
+        struct nfit_test_resource *nfit_res;
+	unsigned int bw;
+
+        nfit_res = nfit_test_lookup((unsigned long) mmio->base);
+        if (!nfit_res) {
+		dev_WARN_ONCE(&nd_region->dev, 1, "no test resource\n");
+		return -EIO;
+	}
+	dev_vdbg(&nd_region->dev, "%s: base: %p offset: %pa\n",
+			__func__, mmio->base, &dpa);
+	bw = nd_region_acquire_lane(nd_region);
+	if (rw)
+		memcpy(nfit_res->buf + dpa, iobuf, len);
+	else
+		memcpy(iobuf, nfit_res->buf + dpa, len);
+	nd_region_release_lane(nd_region, bw);
+
+        return 0;
+}
+
+extern const struct attribute_group *acpi_nfit_attribute_groups[];
+
+static int nfit_test_probe(struct platform_device *pdev)
+{
+	struct nd_bus_descriptor *nd_desc;
+	struct acpi_nfit_desc *acpi_desc;
+	struct device *dev = &pdev->dev;
+	struct nfit_test *nfit_test;
+	int rc;
+
+	nfit_test = to_nfit_test(&pdev->dev);
+
+	/* common alloc */
+	if (nfit_test->num_dcr) {
+		int num = nfit_test->num_dcr;
+
+		nfit_test->dimm = devm_kcalloc(dev, num, sizeof(void *), GFP_KERNEL);
+		nfit_test->dimm_dma = devm_kcalloc(dev, num, sizeof(dma_addr_t), GFP_KERNEL);
+		nfit_test->label = devm_kcalloc(dev, num, sizeof(void *), GFP_KERNEL);
+		nfit_test->label_dma = devm_kcalloc(dev, num, sizeof(dma_addr_t), GFP_KERNEL);
+		nfit_test->dcr = devm_kcalloc(dev, num, sizeof(struct nfit_test_dcr *), GFP_KERNEL);
+		nfit_test->dcr_dma = devm_kcalloc(dev, num, sizeof(dma_addr_t), GFP_KERNEL);
+		if (nfit_test->dimm && nfit_test->dimm_dma && nfit_test->label
+				&& nfit_test->label_dma && nfit_test->dcr
+				&& nfit_test->dcr_dma)
+			/* pass */;
+		else
+			return -ENOMEM;
+	}
+
+	if (nfit_test->num_pm) {
+		int num = nfit_test->num_pm;
+
+		nfit_test->spa_set = devm_kcalloc(dev, num, sizeof(void *), GFP_KERNEL);
+		nfit_test->spa_set_dma = devm_kcalloc(dev, num,
+				sizeof(dma_addr_t), GFP_KERNEL);
+		if (nfit_test->spa_set && nfit_test->spa_set_dma)
+			/* pass */;
+		else
+			return -ENOMEM;
+	}
+
+	/* per-nfit specific alloc */
+	if (nfit_test->alloc(nfit_test))
+		return -ENOMEM;
+
+	nfit_test->setup(nfit_test);
+	acpi_desc = &nfit_test->acpi_desc;
+	acpi_desc->dev = &pdev->dev;
+	acpi_desc->nfit = nfit_test->nfit_buf;
+	acpi_desc->blk_enable = nfit_test_blk_region_enable;
+	acpi_desc->blk_disable = nfit_test_blk_region_disable;
+	acpi_desc->blk_do_io = nfit_test_blk_do_io;
+	nd_desc = &acpi_desc->nd_desc;
+	nd_desc->attr_groups = acpi_nfit_attribute_groups;
+	acpi_desc->nd_bus = nd_bus_register(&pdev->dev, nd_desc);
+	if (!acpi_desc->nd_bus)
+		return -ENXIO;
+
+	rc = acpi_nfit_init(acpi_desc, nfit_test->nfit_size);
+	if (rc) {
+		nd_bus_unregister(acpi_desc->nd_bus);
+		return rc;
+	}
+
+	return 0;
+}
+
+static int nfit_test_remove(struct platform_device *pdev)
+{
+	struct nfit_test *nfit_test = to_nfit_test(&pdev->dev);
+	struct acpi_nfit_desc *acpi_desc = &nfit_test->acpi_desc;
+
+	nd_bus_unregister(acpi_desc->nd_bus);
+
+	return 0;
+}
+
+static void nfit_test_release(struct device *dev)
+{
+	struct nfit_test *nfit_test = to_nfit_test(dev);
+
+	kfree(nfit_test);
+}
+
+static const struct platform_device_id nfit_test_id[] = {
+	{ KBUILD_MODNAME },
+	{ },
+};
+
+static struct platform_driver nfit_test_driver = {
+	.probe = nfit_test_probe,
+	.remove = nfit_test_remove,
+	.driver = {
+		.name = KBUILD_MODNAME,
+	},
+	.id_table = nfit_test_id,
+};
+
+#ifdef CONFIG_CMA_SIZE_MBYTES
+#define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
+#else
+#define CMA_SIZE_MBYTES 0
+#endif
+
+static __init int nfit_test_init(void)
+{
+	int rc, i;
+
+	nfit_test_setup(nfit_test_lookup);
+
+	for (i = 0; i < NUM_NFITS; i++) {
+		struct nfit_test *nfit_test;
+		struct platform_device *pdev;
+		static int once;
+
+		nfit_test = kzalloc(sizeof(*nfit_test), GFP_KERNEL);
+		if (!nfit_test) {
+			rc = -ENOMEM;
+			goto err_register;
+		}
+		INIT_LIST_HEAD(&nfit_test->resources);
+		switch (i) {
+		case 0:
+			nfit_test->num_pm = NUM_PM;
+			nfit_test->num_dcr = NUM_DCR;
+			nfit_test->alloc = nfit_test0_alloc;
+			nfit_test->setup = nfit_test0_setup;
+			break;
+		case 1:
+			nfit_test->num_pm = 1;
+			nfit_test->alloc = nfit_test1_alloc;
+			nfit_test->setup = nfit_test1_setup;
+			break;
+		default:
+			rc = -EINVAL;
+			goto err_register;
+		}
+		pdev = &nfit_test->pdev;
+		pdev->name = KBUILD_MODNAME;
+		pdev->id = i;
+		pdev->dev.release = nfit_test_release;
+		rc = platform_device_register(pdev);
+		if (rc) {
+			put_device(&pdev->dev);
+			goto err_register;
+		}
+
+		rc = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+		if (rc)
+			goto err_register;
+
+		instances[i] = nfit_test;
+
+		if (!once++) {
+			dma_addr_t dma;
+			void *buf;
+
+			buf = dma_alloc_coherent(&pdev->dev, SZ_128M, &dma,
+					GFP_KERNEL);
+			if (!buf) {
+				rc = -ENOMEM;
+				dev_warn(&pdev->dev, "need 128M of free cma\n");
+				goto err_register;
+			}
+			dma_free_coherent(&pdev->dev, SZ_128M, buf, dma);
+		}
+	}
+
+	rc = platform_driver_register(&nfit_test_driver);
+	if (rc)
+		goto err_register;
+	return 0;
+
+ err_register:
+	for (i = 0; i < NUM_NFITS; i++)
+		if (instances[i])
+			platform_device_unregister(&instances[i]->pdev);
+	nfit_test_teardown();
+	return rc;
+}
+
+static __exit void nfit_test_exit(void)
+{
+	int i;
+
+	platform_driver_unregister(&nfit_test_driver);
+	for (i = 0; i < NUM_NFITS; i++)
+		platform_device_unregister(&instances[i]->pdev);
+	nfit_test_teardown();
+}
+
+module_init(nfit_test_init);
+module_exit(nfit_test_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/drivers/block/nd/test/nfit_test.h b/drivers/block/nd/test/nfit_test.h
new file mode 100644
index 000000000000..4a1215ec45c0
--- /dev/null
+++ b/drivers/block/nd/test/nfit_test.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#ifndef __NFIT_TEST_H__
+#define __NFIT_TEST_H__
+
+struct nfit_test_resource {
+	struct list_head list;
+	struct resource *res;
+	struct device *dev;
+	void *buf;
+};
+
+typedef struct nfit_test_resource *(*nfit_test_lookup_fn)(resource_size_t);
+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_teardown(void);
+#endif

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