[linux-2.6-block.git] / arch / powerpc / platforms / pseries / papr_scm.c

// SPDX-License-Identifier: GPL-2.0

#define pr_fmt(fmt)	"papr-scm: " fmt

#include <linux/of.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/ndctl.h>
#include <linux/sched.h>
#include <linux/libnvdimm.h>
#include <linux/platform_device.h>

#include <asm/plpar_wrappers.h>

#define BIND_ANY_ADDR (~0ul)

#define PAPR_SCM_DIMM_CMD_MASK \
	((1ul << ND_CMD_GET_CONFIG_SIZE) | \
	 (1ul << ND_CMD_GET_CONFIG_DATA) | \
	 (1ul << ND_CMD_SET_CONFIG_DATA))

struct papr_scm_priv {
	struct platform_device *pdev;
	struct device_node *dn;
	uint32_t drc_index;
	uint64_t blocks;
	uint64_t block_size;
	int metadata_size;
	bool is_volatile;

	uint64_t bound_addr;

	struct nvdimm_bus_descriptor bus_desc;
	struct nvdimm_bus *bus;
	struct nvdimm *nvdimm;
	struct resource res;
	struct nd_region *region;
	struct nd_interleave_set nd_set;
};

static int drc_pmem_bind(struct papr_scm_priv *p)
{
	unsigned long ret[PLPAR_HCALL_BUFSIZE];
	uint64_t rc, token;
	uint64_t saved = 0;

	/*
	 * When the hypervisor cannot map all the requested memory in a single
	 * hcall it returns H_BUSY and we call again with the token until
	 * we get H_SUCCESS. Aborting the retry loop before getting H_SUCCESS
	 * leave the system in an undefined state, so we wait.
	 */
	token = 0;

	do {
		rc = plpar_hcall(H_SCM_BIND_MEM, ret, p->drc_index, 0,
				p->blocks, BIND_ANY_ADDR, token);
		token = ret[0];
		if (!saved)
			saved = ret[1];
		cond_resched();
	} while (rc == H_BUSY);

	if (rc) {
		dev_err(&p->pdev->dev, "bind err: %lld\n", rc);
		return -ENXIO;
	}

	p->bound_addr = saved;

	dev_dbg(&p->pdev->dev, "bound drc %x to %pR\n", p->drc_index, &p->res);

	return 0;
}

static int drc_pmem_unbind(struct papr_scm_priv *p)
{
	unsigned long ret[PLPAR_HCALL_BUFSIZE];
	uint64_t rc, token;

	token = 0;

	/* NB: unbind has the same retry requirements mentioned above */
	do {
		rc = plpar_hcall(H_SCM_UNBIND_MEM, ret, p->drc_index,
				p->bound_addr, p->blocks, token);
		token = ret[0];
		cond_resched();
	} while (rc == H_BUSY);

	if (rc)
		dev_err(&p->pdev->dev, "unbind error: %lld\n", rc);

	return !!rc;
}

static int papr_scm_meta_get(struct papr_scm_priv *p,
			struct nd_cmd_get_config_data_hdr *hdr)
{
	unsigned long data[PLPAR_HCALL_BUFSIZE];
	int64_t ret;

	if (hdr->in_offset >= p->metadata_size || hdr->in_length != 1)
		return -EINVAL;

	ret = plpar_hcall(H_SCM_READ_METADATA, data, p->drc_index,
			hdr->in_offset, 1);

	if (ret == H_PARAMETER) /* bad DRC index */
		return -ENODEV;
	if (ret)
		return -EINVAL; /* other invalid parameter */

	hdr->out_buf[0] = data[0] & 0xff;

	return 0;
}

static int papr_scm_meta_set(struct papr_scm_priv *p,
			struct nd_cmd_set_config_hdr *hdr)
{
	int64_t ret;

	if (hdr->in_offset >= p->metadata_size || hdr->in_length != 1)
		return -EINVAL;

	ret = plpar_hcall_norets(H_SCM_WRITE_METADATA,
			p->drc_index, hdr->in_offset, hdr->in_buf[0], 1);

	if (ret == H_PARAMETER) /* bad DRC index */
		return -ENODEV;
	if (ret)
		return -EINVAL; /* other invalid parameter */

	return 0;
}

int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
		unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)
{
	struct nd_cmd_get_config_size *get_size_hdr;
	struct papr_scm_priv *p;

	/* Only dimm-specific calls are supported atm */
	if (!nvdimm)
		return -EINVAL;

	p = nvdimm_provider_data(nvdimm);

	switch (cmd) {
	case ND_CMD_GET_CONFIG_SIZE:
		get_size_hdr = buf;

		get_size_hdr->status = 0;
		get_size_hdr->max_xfer = 1;
		get_size_hdr->config_size = p->metadata_size;
		*cmd_rc = 0;
		break;

	case ND_CMD_GET_CONFIG_DATA:
		*cmd_rc = papr_scm_meta_get(p, buf);
		break;

	case ND_CMD_SET_CONFIG_DATA:
		*cmd_rc = papr_scm_meta_set(p, buf);
		break;

	default:
		return -EINVAL;
	}

	dev_dbg(&p->pdev->dev, "returned with cmd_rc = %d\n", *cmd_rc);

	return 0;
}

static const struct attribute_group *region_attr_groups[] = {
	&nd_region_attribute_group,
	&nd_device_attribute_group,
	&nd_mapping_attribute_group,
	&nd_numa_attribute_group,
	NULL,
};

static const struct attribute_group *bus_attr_groups[] = {
	&nvdimm_bus_attribute_group,
	NULL,
};

static const struct attribute_group *papr_scm_dimm_groups[] = {
	&nvdimm_attribute_group,
	&nd_device_attribute_group,
	NULL,
};

static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
{
	struct device *dev = &p->pdev->dev;
	struct nd_mapping_desc mapping;
	struct nd_region_desc ndr_desc;
	unsigned long dimm_flags;

	p->bus_desc.ndctl = papr_scm_ndctl;
	p->bus_desc.module = THIS_MODULE;
	p->bus_desc.of_node = p->pdev->dev.of_node;
	p->bus_desc.attr_groups = bus_attr_groups;
	p->bus_desc.provider_name = kstrdup(p->pdev->name, GFP_KERNEL);

	if (!p->bus_desc.provider_name)
		return -ENOMEM;

	p->bus = nvdimm_bus_register(NULL, &p->bus_desc);
	if (!p->bus) {
		dev_err(dev, "Error creating nvdimm bus %pOF\n", p->dn);
		return -ENXIO;
	}

	dimm_flags = 0;
	set_bit(NDD_ALIASING, &dimm_flags);

	p->nvdimm = nvdimm_create(p->bus, p, papr_scm_dimm_groups,
				dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
	if (!p->nvdimm) {
		dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn);
		goto err;
	}

	if (nvdimm_bus_check_dimm_count(p->bus, 1))
		goto err;

	/* now add the region */

	memset(&mapping, 0, sizeof(mapping));
	mapping.nvdimm = p->nvdimm;
	mapping.start = 0;
	mapping.size = p->blocks * p->block_size; // XXX: potential overflow?

	memset(&ndr_desc, 0, sizeof(ndr_desc));
	ndr_desc.attr_groups = region_attr_groups;
	ndr_desc.numa_node = dev_to_node(&p->pdev->dev);
	ndr_desc.target_node = ndr_desc.numa_node;
	ndr_desc.res = &p->res;
	ndr_desc.of_node = p->dn;
	ndr_desc.provider_data = p;
	ndr_desc.mapping = &mapping;
	ndr_desc.num_mappings = 1;
	ndr_desc.nd_set = &p->nd_set;
	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);

	if (p->is_volatile)
		p->region = nvdimm_volatile_region_create(p->bus, &ndr_desc);
	else
		p->region = nvdimm_pmem_region_create(p->bus, &ndr_desc);
	if (!p->region) {
		dev_err(dev, "Error registering region %pR from %pOF\n",
				ndr_desc.res, p->dn);
		goto err;
	}

	return 0;

err:	nvdimm_bus_unregister(p->bus);
	kfree(p->bus_desc.provider_name);
	return -ENXIO;
}

static int papr_scm_probe(struct platform_device *pdev)
{
	struct device_node *dn = pdev->dev.of_node;
	u32 drc_index, metadata_size;
	u64 blocks, block_size;
	struct papr_scm_priv *p;
	const char *uuid_str;
	u64 uuid[2];
	int rc;

	/* check we have all the required DT properties */
	if (of_property_read_u32(dn, "ibm,my-drc-index", &drc_index)) {
		dev_err(&pdev->dev, "%pOF: missing drc-index!\n", dn);
		return -ENODEV;
	}

	if (of_property_read_u64(dn, "ibm,block-size", &block_size)) {
		dev_err(&pdev->dev, "%pOF: missing block-size!\n", dn);
		return -ENODEV;
	}

	if (of_property_read_u64(dn, "ibm,number-of-blocks", &blocks)) {
		dev_err(&pdev->dev, "%pOF: missing number-of-blocks!\n", dn);
		return -ENODEV;
	}

	if (of_property_read_string(dn, "ibm,unit-guid", &uuid_str)) {
		dev_err(&pdev->dev, "%pOF: missing unit-guid!\n", dn);
		return -ENODEV;
	}


	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return -ENOMEM;

	/* optional DT properties */
	of_property_read_u32(dn, "ibm,metadata-size", &metadata_size);

	p->dn = dn;
	p->drc_index = drc_index;
	p->block_size = block_size;
	p->blocks = blocks;
	p->is_volatile = !of_property_read_bool(dn, "ibm,cache-flush-required");

	/* We just need to ensure that set cookies are unique across */
	uuid_parse(uuid_str, (uuid_t *) uuid);
	p->nd_set.cookie1 = uuid[0];
	p->nd_set.cookie2 = uuid[1];

	/* might be zero */
	p->metadata_size = metadata_size;
	p->pdev = pdev;

	/* request the hypervisor to bind this region to somewhere in memory */
	rc = drc_pmem_bind(p);
	if (rc)
		goto err;

	/* setup the resource for the newly bound range */
	p->res.start = p->bound_addr;
	p->res.end   = p->bound_addr + p->blocks * p->block_size - 1;
	p->res.name  = pdev->name;
	p->res.flags = IORESOURCE_MEM;

	rc = papr_scm_nvdimm_init(p);
	if (rc)
		goto err2;

	platform_set_drvdata(pdev, p);

	return 0;

err2:	drc_pmem_unbind(p);
err:	kfree(p);
	return rc;
}

static int papr_scm_remove(struct platform_device *pdev)
{
	struct papr_scm_priv *p = platform_get_drvdata(pdev);

	nvdimm_bus_unregister(p->bus);
	drc_pmem_unbind(p);
	kfree(p);

	return 0;
}

static const struct of_device_id papr_scm_match[] = {
	{ .compatible = "ibm,pmemory" },
	{ },
};

static struct platform_driver papr_scm_driver = {
	.probe = papr_scm_probe,
	.remove = papr_scm_remove,
	.driver = {
		.name = "papr_scm",
		.owner = THIS_MODULE,
		.of_match_table = papr_scm_match,
	},
};

module_platform_driver(papr_scm_driver);
MODULE_DEVICE_TABLE(of, papr_scm_match);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("IBM Corporation");
Commit	Line	Data
b5beae5e OH	1	// SPDX-License-Identifier: GPL-2.0
	2
	3	#define pr_fmt(fmt) "papr-scm: " fmt
	4
	5	#include <linux/of.h>
	6	#include <linux/kernel.h>
	7	#include <linux/module.h>
	8	#include <linux/ioport.h>
	9	#include <linux/slab.h>
	10	#include <linux/ndctl.h>
	11	#include <linux/sched.h>
	12	#include <linux/libnvdimm.h>
	13	#include <linux/platform_device.h>
	14
	15	#include <asm/plpar_wrappers.h>
	16
	17	#define BIND_ANY_ADDR (~0ul)
	18
	19	#define PAPR_SCM_DIMM_CMD_MASK \
	20	((1ul << ND_CMD_GET_CONFIG_SIZE) \| \
	21	(1ul << ND_CMD_GET_CONFIG_DATA) \| \
	22	(1ul << ND_CMD_SET_CONFIG_DATA))
	23
	24	struct papr_scm_priv {
	25	struct platform_device *pdev;
	26	struct device_node *dn;
	27	uint32_t drc_index;
	28	uint64_t blocks;
	29	uint64_t block_size;
	30	int metadata_size;
2a0ffbd4	31	bool is_volatile;
b5beae5e OH	32
	33	uint64_t bound_addr;
	34
	35	struct nvdimm_bus_descriptor bus_desc;
	36	struct nvdimm_bus *bus;
	37	struct nvdimm *nvdimm;
	38	struct resource res;
	39	struct nd_region *region;
	40	struct nd_interleave_set nd_set;
	41	};
	42
	43	static int drc_pmem_bind(struct papr_scm_priv *p)
	44	{
	45	unsigned long ret[PLPAR_HCALL_BUFSIZE];
	46	uint64_t rc, token;
5a3840a4	47	uint64_t saved = 0;
b5beae5e OH	48
	49	/*
	50	* When the hypervisor cannot map all the requested memory in a single
	51	* hcall it returns H_BUSY and we call again with the token until
	52	* we get H_SUCCESS. Aborting the retry loop before getting H_SUCCESS
	53	* leave the system in an undefined state, so we wait.
	54	*/
	55	token = 0;
	56
	57	do {
	58	rc = plpar_hcall(H_SCM_BIND_MEM, ret, p->drc_index, 0,
	59	p->blocks, BIND_ANY_ADDR, token);
409dd7dc	60	token = ret[0];
5a3840a4 OH	61	if (!saved)
5a3840a4 OH	62	saved = ret[1];
b5beae5e OH	63	cond_resched();
	64	} while (rc == H_BUSY);
	65
	66	if (rc) {
	67	dev_err(&p->pdev->dev, "bind err: %lld\n", rc);
	68	return -ENXIO;
	69	}
	70
5a3840a4	71	p->bound_addr = saved;
b5beae5e OH	72
	73	dev_dbg(&p->pdev->dev, "bound drc %x to %pR\n", p->drc_index, &p->res);
	74
	75	return 0;
	76	}
	77
	78	static int drc_pmem_unbind(struct papr_scm_priv *p)
	79	{
	80	unsigned long ret[PLPAR_HCALL_BUFSIZE];
	81	uint64_t rc, token;
	82
	83	token = 0;
	84
	85	/* NB: unbind has the same retry requirements mentioned above */
	86	do {
	87	rc = plpar_hcall(H_SCM_UNBIND_MEM, ret, p->drc_index,
	88	p->bound_addr, p->blocks, token);
409dd7dc	89	token = ret[0];
b5beae5e OH	90	cond_resched();
	91	} while (rc == H_BUSY);
	92
	93	if (rc)
	94	dev_err(&p->pdev->dev, "unbind error: %lld\n", rc);
	95
	96	return !!rc;
	97	}
	98
	99	static int papr_scm_meta_get(struct papr_scm_priv *p,
	100	struct nd_cmd_get_config_data_hdr *hdr)
	101	{
	102	unsigned long data[PLPAR_HCALL_BUFSIZE];
	103	int64_t ret;
	104
	105	if (hdr->in_offset >= p->metadata_size \|\| hdr->in_length != 1)
	106	return -EINVAL;
	107
	108	ret = plpar_hcall(H_SCM_READ_METADATA, data, p->drc_index,
	109	hdr->in_offset, 1);
	110
	111	if (ret == H_PARAMETER) /* bad DRC index */
	112	return -ENODEV;
	113	if (ret)
	114	return -EINVAL; /* other invalid parameter */
	115
	116	hdr->out_buf[0] = data[0] & 0xff;
	117
	118	return 0;
	119	}
	120
	121	static int papr_scm_meta_set(struct papr_scm_priv *p,
	122	struct nd_cmd_set_config_hdr *hdr)
	123	{
	124	int64_t ret;
	125
	126	if (hdr->in_offset >= p->metadata_size \|\| hdr->in_length != 1)
	127	return -EINVAL;
	128
	129	ret = plpar_hcall_norets(H_SCM_WRITE_METADATA,
	130	p->drc_index, hdr->in_offset, hdr->in_buf[0], 1);
	131
	132	if (ret == H_PARAMETER) /* bad DRC index */
	133	return -ENODEV;
	134	if (ret)
	135	return -EINVAL; /* other invalid parameter */
	136
	137	return 0;
	138	}
	139
	140	int papr_scm_ndctl(struct nvdimm_bus_descriptor nd_desc, struct nvdimm nvdimm,
	141	unsigned int cmd, void buf, unsigned int buf_len, int cmd_rc)
	142	{
	143	struct nd_cmd_get_config_size *get_size_hdr;
	144	struct papr_scm_priv *p;
	145
	146	/* Only dimm-specific calls are supported atm */
	147	if (!nvdimm)
	148	return -EINVAL;
	149
	150	p = nvdimm_provider_data(nvdimm);
	151
	152	switch (cmd) {
	153	case ND_CMD_GET_CONFIG_SIZE:
154	get_size_hdr = buf;
155
156	get_size_hdr->status = 0;
157	get_size_hdr->max_xfer = 1;
158	get_size_hdr->config_size = p->metadata_size;
159	*cmd_rc = 0;
160	break;
161
162	case ND_CMD_GET_CONFIG_DATA:
163	*cmd_rc = papr_scm_meta_get(p, buf);
164	break;
165
166	case ND_CMD_SET_CONFIG_DATA:
167	*cmd_rc = papr_scm_meta_set(p, buf);
168	break;
169
170	default:
171	return -EINVAL;
172	}
173
174	dev_dbg(&p->pdev->dev, "returned with cmd_rc = %d\n", *cmd_rc);
175
176	return 0;
177	}
178
179	static const struct attribute_group *region_attr_groups[] = {
180	&nd_region_attribute_group,
181	&nd_device_attribute_group,
182	&nd_mapping_attribute_group,
183	&nd_numa_attribute_group,
184	NULL,
185	};
186
187	static const struct attribute_group *bus_attr_groups[] = {
188	&nvdimm_bus_attribute_group,
189	NULL,
190	};
191
192	static const struct attribute_group *papr_scm_dimm_groups[] = {
193	&nvdimm_attribute_group,
194	&nd_device_attribute_group,
195	NULL,
196	};
197
198	static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
199	{
200	struct device *dev = &p->pdev->dev;
201	struct nd_mapping_desc mapping;
202	struct nd_region_desc ndr_desc;
203	unsigned long dimm_flags;
204
205	p->bus_desc.ndctl = papr_scm_ndctl;
206	p->bus_desc.module = THIS_MODULE;
207	p->bus_desc.of_node = p->pdev->dev.of_node;
208	p->bus_desc.attr_groups = bus_attr_groups;
209	p->bus_desc.provider_name = kstrdup(p->pdev->name, GFP_KERNEL);
210
211	if (!p->bus_desc.provider_name)
212	return -ENOMEM;
213
214	p->bus = nvdimm_bus_register(NULL, &p->bus_desc);
215	if (!p->bus) {
216	dev_err(dev, "Error creating nvdimm bus %pOF\n", p->dn);
217	return -ENXIO;
218	}
219
220	dimm_flags = 0;
221	set_bit(NDD_ALIASING, &dimm_flags);
222
223	p->nvdimm = nvdimm_create(p->bus, p, papr_scm_dimm_groups,
224	dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
225	if (!p->nvdimm) {
226	dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn);
227	goto err;
228	}
229
b0d65a8c OH	230	if (nvdimm_bus_check_dimm_count(p->bus, 1))
	231	goto err;
	232
b5beae5e OH	233	/* now add the region */
	234
	235	memset(&mapping, 0, sizeof(mapping));
	236	mapping.nvdimm = p->nvdimm;
	237	mapping.start = 0;
	238	mapping.size = p->blocks * p->block_size; // XXX: potential overflow?
	239
	240	memset(&ndr_desc, 0, sizeof(ndr_desc));
	241	ndr_desc.attr_groups = region_attr_groups;
	242	ndr_desc.numa_node = dev_to_node(&p->pdev->dev);
8fc5c735	243	ndr_desc.target_node = ndr_desc.numa_node;
b5beae5e OH	244	ndr_desc.res = &p->res;
	245	ndr_desc.of_node = p->dn;
	246	ndr_desc.provider_data = p;
	247	ndr_desc.mapping = &mapping;
	248	ndr_desc.num_mappings = 1;
	249	ndr_desc.nd_set = &p->nd_set;
	250	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
	251
2a0ffbd4 AK	252	if (p->is_volatile)
	253	p->region = nvdimm_volatile_region_create(p->bus, &ndr_desc);
	254	else
	255	p->region = nvdimm_pmem_region_create(p->bus, &ndr_desc);
b5beae5e OH	256	if (!p->region) {
	257	dev_err(dev, "Error registering region %pR from %pOF\n",
	258	ndr_desc.res, p->dn);
	259	goto err;
	260	}
	261
	262	return 0;
	263
	264	err: nvdimm_bus_unregister(p->bus);
	265	kfree(p->bus_desc.provider_name);
	266	return -ENXIO;
	267	}
	268
	269	static int papr_scm_probe(struct platform_device *pdev)
	270	{
b5beae5e	271	struct device_node *dn = pdev->dev.of_node;
683ec0e0 OH	272	u32 drc_index, metadata_size;
683ec0e0 OH	273	u64 blocks, block_size;
b5beae5e	274	struct papr_scm_priv *p;
43001c52 OH	275	const char *uuid_str;
43001c52 OH	276	u64 uuid[2];
b5beae5e OH	277	int rc;
	278
	279	/* check we have all the required DT properties */
	280	if (of_property_read_u32(dn, "ibm,my-drc-index", &drc_index)) {
	281	dev_err(&pdev->dev, "%pOF: missing drc-index!\n", dn);
	282	return -ENODEV;
	283	}
	284
683ec0e0 OH	285	if (of_property_read_u64(dn, "ibm,block-size", &block_size)) {
	286	dev_err(&pdev->dev, "%pOF: missing block-size!\n", dn);
	287	return -ENODEV;
	288	}
	289
	290	if (of_property_read_u64(dn, "ibm,number-of-blocks", &blocks)) {
	291	dev_err(&pdev->dev, "%pOF: missing number-of-blocks!\n", dn);
b5beae5e OH	292	return -ENODEV;
	293	}
	294
43001c52 OH	295	if (of_property_read_string(dn, "ibm,unit-guid", &uuid_str)) {
	296	dev_err(&pdev->dev, "%pOF: missing unit-guid!\n", dn);
	297	return -ENODEV;
	298	}
	299
2a0ffbd4	300
b5beae5e OH	301	p = kzalloc(sizeof(*p), GFP_KERNEL);
	302	if (!p)
	303	return -ENOMEM;
	304
	305	/* optional DT properties */
	306	of_property_read_u32(dn, "ibm,metadata-size", &metadata_size);
	307
	308	p->dn = dn;
	309	p->drc_index = drc_index;
683ec0e0 OH	310	p->block_size = block_size;
683ec0e0 OH	311	p->blocks = blocks;
2a0ffbd4	312	p->is_volatile = !of_property_read_bool(dn, "ibm,cache-flush-required");
b5beae5e	313
43001c52 OH	314	/* We just need to ensure that set cookies are unique across */
	315	uuid_parse(uuid_str, (uuid_t *) uuid);
	316	p->nd_set.cookie1 = uuid[0];
	317	p->nd_set.cookie2 = uuid[1];
	318
b5beae5e OH	319	/* might be zero */
	320	p->metadata_size = metadata_size;
	321	p->pdev = pdev;
	322
	323	/* request the hypervisor to bind this region to somewhere in memory */
	324	rc = drc_pmem_bind(p);
	325	if (rc)
	326	goto err;
	327
	328	/* setup the resource for the newly bound range */
	329	p->res.start = p->bound_addr;
59613526	330	p->res.end = p->bound_addr + p->blocks * p->block_size - 1;
b5beae5e OH	331	p->res.name = pdev->name;
	332	p->res.flags = IORESOURCE_MEM;
	333
	334	rc = papr_scm_nvdimm_init(p);
	335	if (rc)
	336	goto err2;
	337
	338	platform_set_drvdata(pdev, p);
	339
	340	return 0;
	341
	342	err2: drc_pmem_unbind(p);
	343	err: kfree(p);
	344	return rc;
	345	}
	346
	347	static int papr_scm_remove(struct platform_device *pdev)
	348	{
	349	struct papr_scm_priv *p = platform_get_drvdata(pdev);
	350
	351	nvdimm_bus_unregister(p->bus);
	352	drc_pmem_unbind(p);
	353	kfree(p);
	354
	355	return 0;
	356	}
	357
	358	static const struct of_device_id papr_scm_match[] = {
	359	{ .compatible = "ibm,pmemory" },
	360	{ },
	361	};
	362
	363	static struct platform_driver papr_scm_driver = {
	364	.probe = papr_scm_probe,
	365	.remove = papr_scm_remove,
	366	.driver = {
	367	.name = "papr_scm",
	368	.owner = THIS_MODULE,
	369	.of_match_table = papr_scm_match,
	370	},
	371	};
	372
	373	module_platform_driver(papr_scm_driver);
	374	MODULE_DEVICE_TABLE(of, papr_scm_match);
	375	MODULE_LICENSE("GPL");
	376	MODULE_AUTHOR("IBM Corporation");