[mirror_ubuntu-zesty-kernel.git] / drivers / nvdimm / nd.h

/*
 * 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 __ND_H__
#define __ND_H__
#include <linux/libnvdimm.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/types.h>
#include "label.h"

enum {
	/*
	 * Limits the maximum number of block apertures a dimm can
	 * support and is an input to the geometry/on-disk-format of a
	 * BTT instance
	 */
	ND_MAX_LANES = 256,
	SECTOR_SHIFT = 9,
	INT_LBASIZE_ALIGNMENT = 64,
#if IS_ENABLED(CONFIG_NVDIMM_PFN)
	ND_PFN_ALIGN = PAGES_PER_SECTION * PAGE_SIZE,
	ND_PFN_MASK = ND_PFN_ALIGN - 1,
#else
	ND_PFN_ALIGN = 0,
	ND_PFN_MASK = 0,
#endif
};

struct nvdimm_drvdata {
	struct device *dev;
	int nsindex_size;
	struct nd_cmd_get_config_size nsarea;
	void *data;
	int ns_current, ns_next;
	struct resource dpa;
	struct kref kref;
};

struct nd_region_namespaces {
	int count;
	int active;
};

static inline struct nd_namespace_index *to_namespace_index(
		struct nvdimm_drvdata *ndd, int i)
{
	if (i < 0)
		return NULL;

	return ndd->data + sizeof_namespace_index(ndd) * i;
}

static inline struct nd_namespace_index *to_current_namespace_index(
		struct nvdimm_drvdata *ndd)
{
	return to_namespace_index(ndd, ndd->ns_current);
}

static inline struct nd_namespace_index *to_next_namespace_index(
		struct nvdimm_drvdata *ndd)
{
	return to_namespace_index(ndd, ndd->ns_next);
}

#define nd_dbg_dpa(r, d, res, fmt, arg...) \
	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
		(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
		(unsigned long long) (res ? resource_size(res) : 0), \
		(unsigned long long) (res ? res->start : 0), ##arg)

#define for_each_label(l, label, labels) \
	for (l = 0; (label = labels ? labels[l] : NULL); l++)

#define for_each_dpa_resource(ndd, res) \
	for (res = (ndd)->dpa.child; res; res = res->sibling)

#define for_each_dpa_resource_safe(ndd, res, next) \
	for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
			res; res = next, next = next ? next->sibling : NULL)

struct nd_percpu_lane {
	int count;
	spinlock_t lock;
};

struct nd_region {
	struct device dev;
	struct ida ns_ida;
	struct ida btt_ida;
	struct ida pfn_ida;
	unsigned long flags;
	struct device *ns_seed;
	struct device *btt_seed;
	struct device *pfn_seed;
	u16 ndr_mappings;
	u64 ndr_size;
	u64 ndr_start;
	int id, num_lanes, ro, numa_node;
	void *provider_data;
	struct nd_interleave_set *nd_set;
	struct nd_percpu_lane __percpu *lane;
	struct nd_mapping mapping[0];
};

struct nd_blk_region {
	int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
	void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
	int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
			void *iobuf, u64 len, int rw);
	void *blk_provider_data;
	struct nd_region nd_region;
};

/*
 * Lookup next in the repeating sequence of 01, 10, and 11.
 */
static inline unsigned nd_inc_seq(unsigned seq)
{
	static const unsigned next[] = { 0, 2, 3, 1 };

	return next[seq & 3];
}

struct btt;
struct nd_btt {
	struct device dev;
	struct nd_namespace_common *ndns;
	struct btt *btt;
	unsigned long lbasize;
	u8 *uuid;
	int id;
};

enum nd_pfn_mode {
	PFN_MODE_NONE,
	PFN_MODE_RAM,
	PFN_MODE_PMEM,
};

struct nd_pfn {
	int id;
	u8 *uuid;
	struct device dev;
	unsigned long npfns;
	enum nd_pfn_mode mode;
	struct nd_pfn_sb *pfn_sb;
	struct nd_namespace_common *ndns;
};

enum nd_async_mode {
	ND_SYNC,
	ND_ASYNC,
};

int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
void wait_nvdimm_bus_probe_idle(struct device *dev);
void nd_device_register(struct device *dev);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
		size_t len);
ssize_t nd_sector_size_show(unsigned long current_lbasize,
		const unsigned long *supported, char *buf);
ssize_t nd_sector_size_store(struct device *dev, const char *buf,
		unsigned long *current_lbasize, const unsigned long *supported);
int __init nvdimm_init(void);
int __init nd_region_init(void);
void nvdimm_exit(void);
void nd_region_exit(void);
struct nvdimm;
struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
		void *buf, size_t len);
struct nd_btt *to_nd_btt(struct device *dev);

struct nd_gen_sb {
	char reserved[SZ_4K - 8];
	__le64 checksum;
};

u64 nd_sb_checksum(struct nd_gen_sb *sb);
#if IS_ENABLED(CONFIG_BTT)
int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata);
bool is_nd_btt(struct device *dev);
struct device *nd_btt_create(struct nd_region *nd_region);
#else
static inline int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
{
	return -ENODEV;
}

static inline bool is_nd_btt(struct device *dev)
{
	return false;
}

static inline struct device *nd_btt_create(struct nd_region *nd_region)
{
	return NULL;
}
#endif

struct nd_pfn *to_nd_pfn(struct device *dev);
#if IS_ENABLED(CONFIG_NVDIMM_PFN)
int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata);
bool is_nd_pfn(struct device *dev);
struct device *nd_pfn_create(struct nd_region *nd_region);
int nd_pfn_validate(struct nd_pfn *nd_pfn);
#else
static inline int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
{
	return -ENODEV;
}

static inline bool is_nd_pfn(struct device *dev)
{
	return false;
}

static inline struct device *nd_pfn_create(struct nd_region *nd_region)
{
	return NULL;
}

static inline int nd_pfn_validate(struct nd_pfn *nd_pfn)
{
	return -ENODEV;
}
#endif

struct nd_region *to_nd_region(struct device *dev);
int nd_region_to_nstype(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
void nvdimm_bus_lock(struct device *dev);
void nvdimm_bus_unlock(struct device *dev);
bool is_nvdimm_bus_locked(struct device *dev);
int nvdimm_revalidate_disk(struct gendisk *disk);
void nvdimm_drvdata_release(struct kref *kref);
void put_ndd(struct nvdimm_drvdata *ndd);
int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
		struct nd_label_id *label_id, resource_size_t start,
		resource_size_t n);
resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
		char *name);
int nd_blk_region_init(struct nd_region *nd_region);
void __nd_iostat_start(struct bio *bio, unsigned long *start);
static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
{
	struct gendisk *disk = bio->bi_bdev->bd_disk;

	if (!blk_queue_io_stat(disk->queue))
		return false;

	__nd_iostat_start(bio, start);
	return true;
}
void nd_iostat_end(struct bio *bio, unsigned long start);
resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
const u8 *nd_dev_to_uuid(struct device *dev);
bool pmem_should_map_pages(struct device *dev);
#endif /* __ND_H__ */
Commit	Line	Data
4d88a97a DW	1	/*
	2	* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*/
	13	#ifndef __ND_H__
	14	#define __ND_H__
1f7df6f8	15	#include <linux/libnvdimm.h>
f0dc089c	16	#include <linux/blkdev.h>
4d88a97a DW	17	#include <linux/device.h>
	18	#include <linux/mutex.h>
	19	#include <linux/ndctl.h>
bf9bccc1	20	#include <linux/types.h>
4a826c83	21	#include "label.h"
4d88a97a	22
8c2f7e86	23	enum {
5212e11f VV	24	/*
	25	* Limits the maximum number of block apertures a dimm can
	26	* support and is an input to the geometry/on-disk-format of a
	27	* BTT instance
	28	*/
	29	ND_MAX_LANES = 256,
8c2f7e86	30	SECTOR_SHIFT = 9,
fcae6957	31	INT_LBASIZE_ALIGNMENT = 64,
e1455744 DW	32	#if IS_ENABLED(CONFIG_NVDIMM_PFN)
	33	ND_PFN_ALIGN = PAGES_PER_SECTION * PAGE_SIZE,
	34	ND_PFN_MASK = ND_PFN_ALIGN - 1,
	35	#else
	36	ND_PFN_ALIGN = 0,
	37	ND_PFN_MASK = 0,
	38	#endif
8c2f7e86 DW	39	};
8c2f7e86 DW	40
4d88a97a DW	41	struct nvdimm_drvdata {
4d88a97a DW	42	struct device *dev;
4a826c83	43	int nsindex_size;
4d88a97a DW	44	struct nd_cmd_get_config_size nsarea;
4d88a97a DW	45	void *data;
4a826c83 DW	46	int ns_current, ns_next;
4a826c83 DW	47	struct resource dpa;
bf9bccc1	48	struct kref kref;
4d88a97a DW	49	};
4d88a97a DW	50
3d88002e DW	51	struct nd_region_namespaces {
	52	int count;
	53	int active;
	54	};
	55
4a826c83 DW	56	static inline struct nd_namespace_index *to_namespace_index(
	57	struct nvdimm_drvdata *ndd, int i)
	58	{
	59	if (i < 0)
	60	return NULL;
	61
	62	return ndd->data + sizeof_namespace_index(ndd) * i;
	63	}
	64
	65	static inline struct nd_namespace_index *to_current_namespace_index(
	66	struct nvdimm_drvdata *ndd)
	67	{
	68	return to_namespace_index(ndd, ndd->ns_current);
	69	}
	70
	71	static inline struct nd_namespace_index *to_next_namespace_index(
	72	struct nvdimm_drvdata *ndd)
	73	{
	74	return to_namespace_index(ndd, ndd->ns_next);
	75	}
	76
	77	#define nd_dbg_dpa(r, d, res, fmt, arg...) \
	78	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
	79	(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
	80	(unsigned long long) (res ? resource_size(res) : 0), \
	81	(unsigned long long) (res ? res->start : 0), ##arg)
	82
bf9bccc1 DW	83	#define for_each_label(l, label, labels) \
	84	for (l = 0; (label = labels ? labels[l] : NULL); l++)
	85
	86	#define for_each_dpa_resource(ndd, res) \
	87	for (res = (ndd)->dpa.child; res; res = res->sibling)
	88
4a826c83 DW	89	#define for_each_dpa_resource_safe(ndd, res, next) \
	90	for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
	91	res; res = next, next = next ? next->sibling : NULL)
	92
5212e11f VV	93	struct nd_percpu_lane {
	94	int count;
	95	spinlock_t lock;
	96	};
	97
1f7df6f8 DW	98	struct nd_region {
1f7df6f8 DW	99	struct device dev;
1b40e09a	100	struct ida ns_ida;
8c2f7e86	101	struct ida btt_ida;
e1455744	102	struct ida pfn_ida;
004f1afb	103	unsigned long flags;
bf9bccc1	104	struct device *ns_seed;
8c2f7e86	105	struct device *btt_seed;
e1455744	106	struct device *pfn_seed;
1f7df6f8 DW	107	u16 ndr_mappings;
	108	u64 ndr_size;
	109	u64 ndr_start;
41d7a6d6	110	int id, num_lanes, ro, numa_node;
1f7df6f8	111	void *provider_data;
eaf96153	112	struct nd_interleave_set *nd_set;
5212e11f	113	struct nd_percpu_lane __percpu *lane;
1f7df6f8 DW	114	struct nd_mapping mapping[0];
	115	};
	116
047fc8a1 RZ	117	struct nd_blk_region {
	118	int (enable)(struct nvdimm_bus nvdimm_bus, struct device *dev);
	119	void (disable)(struct nvdimm_bus nvdimm_bus, struct device *dev);
	120	int (do_io)(struct nd_blk_region ndbr, resource_size_t dpa,
	121	void *iobuf, u64 len, int rw);
	122	void *blk_provider_data;
	123	struct nd_region nd_region;
	124	};
	125
4a826c83 DW	126	/*
	127	* Lookup next in the repeating sequence of 01, 10, and 11.
	128	*/
	129	static inline unsigned nd_inc_seq(unsigned seq)
	130	{
	131	static const unsigned next[] = { 0, 2, 3, 1 };
	132
	133	return next[seq & 3];
	134	}
f524bf27	135
5212e11f	136	struct btt;
8c2f7e86 DW	137	struct nd_btt {
	138	struct device dev;
	139	struct nd_namespace_common *ndns;
5212e11f	140	struct btt *btt;
8c2f7e86 DW	141	unsigned long lbasize;
	142	u8 *uuid;
	143	int id;
	144	};
	145
e1455744 DW	146	enum nd_pfn_mode {
	147	PFN_MODE_NONE,
	148	PFN_MODE_RAM,
	149	PFN_MODE_PMEM,
	150	};
	151
	152	struct nd_pfn {
	153	int id;
	154	u8 *uuid;
	155	struct device dev;
	156	unsigned long npfns;
	157	enum nd_pfn_mode mode;
	158	struct nd_pfn_sb *pfn_sb;
	159	struct nd_namespace_common *ndns;
	160	};
	161
4d88a97a DW	162	enum nd_async_mode {
	163	ND_SYNC,
	164	ND_ASYNC,
	165	};
	166
41cd8b70	167	int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
bf9bccc1	168	void wait_nvdimm_bus_probe_idle(struct device *dev);
4d88a97a DW	169	void nd_device_register(struct device *dev);
4d88a97a DW	170	void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
bf9bccc1 DW	171	int nd_uuid_store(struct device dev, u8 uuid_out, const char buf,
bf9bccc1 DW	172	size_t len);
1b40e09a DW	173	ssize_t nd_sector_size_show(unsigned long current_lbasize,
	174	const unsigned long supported, char buf);
	175	ssize_t nd_sector_size_store(struct device dev, const char buf,
	176	unsigned long current_lbasize, const unsigned long supported);
4d88a97a	177	int __init nvdimm_init(void);
3d88002e	178	int __init nd_region_init(void);
4d88a97a	179	void nvdimm_exit(void);
3d88002e	180	void nd_region_exit(void);
bf9bccc1 DW	181	struct nvdimm;
bf9bccc1 DW	182	struct nvdimm_drvdata to_ndd(struct nd_mapping nd_mapping);
4d88a97a DW	183	int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
4d88a97a DW	184	int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
f524bf27 DW	185	int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
f524bf27 DW	186	void *buf, size_t len);
8c2f7e86	187	struct nd_btt to_nd_btt(struct device dev);
e1455744 DW	188
	189	struct nd_gen_sb {
	190	char reserved[SZ_4K - 8];
	191	__le64 checksum;
	192	};
	193
	194	u64 nd_sb_checksum(struct nd_gen_sb *sb);
8c2f7e86 DW	195	#if IS_ENABLED(CONFIG_BTT)
	196	int nd_btt_probe(struct nd_namespace_common ndns, void drvdata);
	197	bool is_nd_btt(struct device *dev);
	198	struct device nd_btt_create(struct nd_region nd_region);
	199	#else
f6ef5a2a	200	static inline int nd_btt_probe(struct nd_namespace_common ndns, void drvdata)
8c2f7e86 DW	201	{
	202	return -ENODEV;
	203	}
	204
	205	static inline bool is_nd_btt(struct device *dev)
	206	{
	207	return false;
	208	}
	209
	210	static inline struct device nd_btt_create(struct nd_region nd_region)
	211	{
	212	return NULL;
	213	}
e1455744	214	#endif
8c2f7e86	215
e1455744 DW	216	struct nd_pfn to_nd_pfn(struct device dev);
	217	#if IS_ENABLED(CONFIG_NVDIMM_PFN)
	218	int nd_pfn_probe(struct nd_namespace_common ndns, void drvdata);
	219	bool is_nd_pfn(struct device *dev);
	220	struct device nd_pfn_create(struct nd_region nd_region);
32ab0a3f	221	int nd_pfn_validate(struct nd_pfn *nd_pfn);
e1455744 DW	222	#else
	223	static inline int nd_pfn_probe(struct nd_namespace_common ndns, void drvdata)
	224	{
	225	return -ENODEV;
	226	}
	227
	228	static inline bool is_nd_pfn(struct device *dev)
	229	{
	230	return false;
	231	}
	232
	233	static inline struct device nd_pfn_create(struct nd_region nd_region)
	234	{
	235	return NULL;
	236	}
32ab0a3f DW	237
	238	static inline int nd_pfn_validate(struct nd_pfn *nd_pfn)
	239	{
	240	return -ENODEV;
	241	}
8c2f7e86	242	#endif
e1455744	243
3d88002e DW	244	struct nd_region to_nd_region(struct device dev);
	245	int nd_region_to_nstype(struct nd_region *nd_region);
	246	int nd_region_register_namespaces(struct nd_region nd_region, int err);
bf9bccc1	247	u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
3d88002e DW	248	void nvdimm_bus_lock(struct device *dev);
	249	void nvdimm_bus_unlock(struct device *dev);
	250	bool is_nvdimm_bus_locked(struct device *dev);
58138820	251	int nvdimm_revalidate_disk(struct gendisk *disk);
bf9bccc1 DW	252	void nvdimm_drvdata_release(struct kref *kref);
bf9bccc1 DW	253	void put_ndd(struct nvdimm_drvdata *ndd);
4a826c83 DW	254	int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
	255	void nvdimm_free_dpa(struct nvdimm_drvdata ndd, struct resource res);
	256	struct resource nvdimm_allocate_dpa(struct nvdimm_drvdata ndd,
	257	struct nd_label_id *label_id, resource_size_t start,
	258	resource_size_t n);
8c2f7e86 DW	259	resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
8c2f7e86 DW	260	struct nd_namespace_common nvdimm_namespace_common_probe(struct device dev);
5212e11f VV	261	int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
	262	int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
	263	const char nvdimm_namespace_disk_name(struct nd_namespace_common ndns,
	264	char *name);
047fc8a1	265	int nd_blk_region_init(struct nd_region *nd_region);
f0dc089c DW	266	void __nd_iostat_start(struct bio bio, unsigned long start);
	267	static inline bool nd_iostat_start(struct bio bio, unsigned long start)
	268	{
	269	struct gendisk *disk = bio->bi_bdev->bd_disk;
	270
	271	if (!blk_queue_io_stat(disk->queue))
	272	return false;
	273
	274	__nd_iostat_start(bio, start);
	275	return true;
	276	}
	277	void nd_iostat_end(struct bio *bio, unsigned long start);
047fc8a1	278	resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
6ec68954	279	const u8 nd_dev_to_uuid(struct device dev);
004f1afb	280	bool pmem_should_map_pages(struct device *dev);
4d88a97a	281	#endif /* __ND_H__ */