Release 4.14 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/badblocks.h>
#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/types.h>
#include <linux/nd.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,
	
NVDIMM_IO_ATOMIC = 1,
};


struct nd_poison {
	
u64 start;
	
u64 length;
	
struct list_head list;
};


struct nvdimm_drvdata {
	
struct device *dev;
	
int nslabel_size;
	
struct nd_cmd_get_config_size nsarea;
	
void *data;
	

int ns_current, ns_next;
	
struct resource dpa;
	
struct kref kref;
};


struct nd_region_data {
	
int ns_count;
	
int ns_active;
	
unsigned int hints_shift;
	
void __iomem *flush_wpq[0];
};



static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
		int dimm, int hint)
{
	unsigned int num = 1 << ndrd->hints_shift;
	unsigned int mask = num - 1;

	return ndrd->flush_wpq[dimm * num + (hint & mask)];
}

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static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
		int hint, void __iomem *flush)
{
	unsigned int num = 1 << ndrd->hints_shift;
	unsigned int mask = num - 1;

	ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
}

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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;
}

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

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

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unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);


#define namespace_label_has(ndd, field) \
	(offsetof(struct nd_namespace_label, field) \
                < sizeof_namespace_label(ndd))


#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_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_label_ent {
	
struct list_head list;
	
struct nd_namespace_label *label;
};


enum nd_mapping_lock_class {
	
ND_MAPPING_CLASS0,
	
ND_MAPPING_UUID_SCAN,
};


struct nd_mapping {
	
struct nvdimm *nvdimm;
	
u64 start;
	
u64 size;
	
int position;
	
struct list_head labels;
	
struct mutex lock;
	/*
         * @ndd is for private use at region enable / disable time for
         * get_ndd() + put_ndd(), all other nd_mapping to ndd
         * conversions use to_ndd() which respects enabled state of the
         * nvdimm.
         */
	
struct nvdimm_drvdata *ndd;
};


struct nd_region {
	
struct device dev;
	
struct ida ns_ida;
	
struct ida btt_ida;
	
struct ida pfn_ida;
	
struct ida dax_ida;
	
unsigned long flags;
	
struct device *ns_seed;
	
struct device *btt_seed;
	
struct device *pfn_seed;
	
struct device *dax_seed;
	
u16 ndr_mappings;
	
u64 ndr_size;
	
u64 ndr_start;
	



int id, num_lanes, ro, numa_node;
	
void *provider_data;
	
struct kernfs_node *bb_state;
	
struct badblocks bb;
	
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);
	
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];
}

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struct btt;

struct nd_btt {
	
struct device dev;
	
struct nd_namespace_common *ndns;
	
struct btt *btt;
	
unsigned long lbasize;
	
u64 size;
	
u8 *uuid;
	
int id;
	
int initial_offset;
	
u16 version_major;
	
u16 version_minor;
};


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 align;
	
unsigned long npfns;
	
enum nd_pfn_mode mode;
	
struct nd_pfn_sb *pfn_sb;
	
struct nd_namespace_common *ndns;
};


struct nd_dax {
	
struct nd_pfn nd_pfn;
};


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);
void nd_device_notify(struct device *dev, enum nvdimm_event event);
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
		size_t len);
ssize_t nd_size_select_show(unsigned long current_size,
		const unsigned long *supported, char *buf);
ssize_t nd_size_select_store(struct device *dev, const char *buf,
		unsigned long *current_size, const unsigned long *supported);
int __init nvdimm_init(void);
int __init nd_region_init(void);
int __init nd_label_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_check_config_data(struct device *dev);
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);
long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
		unsigned int len);
void nvdimm_set_aliasing(struct device *dev);
void nvdimm_set_locked(struct device *dev);
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 device *dev, struct nd_namespace_common *ndns);
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 device *dev,
		struct nd_namespace_common *ndns)
{
	return -ENODEV;
}

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

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

struct nd_pfn *to_nd_pfn(struct device *dev);
#if IS_ENABLED(CONFIG_NVDIMM_PFN)

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

#define PFN_DEFAULT_ALIGNMENT HPAGE_PMD_SIZE
#else

#define PFN_DEFAULT_ALIGNMENT PAGE_SIZE
#endif

int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
bool is_nd_pfn(struct device *dev);
struct device *nd_pfn_create(struct nd_region *nd_region);
struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
		struct nd_namespace_common *ndns);
int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
extern struct attribute_group nd_pfn_attribute_group;
#else


static inline int nd_pfn_probe(struct device *dev,
		struct nd_namespace_common *ndns)
{
	return -ENODEV;
}

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

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

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

struct nd_dax *to_nd_dax(struct device *dev);
#if IS_ENABLED(CONFIG_NVDIMM_DAX)
int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
bool is_nd_dax(struct device *dev);
struct device *nd_dax_create(struct nd_region *nd_region);
#else


static inline int nd_dax_probe(struct device *dev,
		struct nd_namespace_common *ndns)
{
	return -ENODEV;
}

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

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static inline struct device *nd_dax_create(struct nd_region *nd_region)
{
	return NULL;
}
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#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,
		struct nd_namespace_index *nsindex);
u64 nd_region_interleave_set_altcookie(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_btt *nd_btt);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
		char *name);
unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
void nvdimm_badblocks_populate(struct nd_region *nd_region,
		struct badblocks *bb, const struct resource *res);
#if IS_ENABLED(CONFIG_ND_CLAIM)
struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
		struct resource *res, struct vmem_altmap *altmap);
int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio);
void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
#else


static inline struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
		struct resource *res, struct vmem_altmap *altmap)
{
	return ERR_PTR(-ENXIO);
}
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static inline int devm_nsio_enable(struct device *dev,
		struct nd_namespace_io *nsio)
{
	return -ENXIO;
}
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static inline void devm_nsio_disable(struct device *dev,
		struct nd_namespace_io *nsio)
{
}
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#endif
int nd_blk_region_init(struct nd_region *nd_region);
int nd_region_activate(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_disk;

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

	*start = jiffies;
	generic_start_io_acct(disk->queue, bio_data_dir(bio),
			      bio_sectors(bio), &disk->part0);
	return true;
}
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static inline void nd_iostat_end(struct bio *bio, unsigned long start)
{
	struct gendisk *disk = bio->bi_disk;

	generic_end_io_acct(disk->queue, bio_data_dir(bio), &disk->part0,
				start);
}
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static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
		unsigned int len)
{
	if (bb->count) {
		sector_t first_bad;
		int num_bad;

		return !!badblocks_check(bb, sector, len / 512, &first_bad,
				&num_bad);
	}

	return false;
}
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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__ */
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Directory: drivers/nvdimm

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