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/*
* libnvdimm - Non-volatile-memory Devices Subsystem
*
* 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 __LIBNVDIMM_H__
#define __LIBNVDIMM_H__
#include <linux/kernel.h>
#include <linux/sizes.h>
#include <linux/types.h>
#include <linux/uuid.h>
#include <linux/spinlock.h>
struct badrange_entry {
u64 start;
u64 length;
struct list_head list;
};
struct badrange {
struct list_head list;
spinlock_t lock;
};
enum {
/* when a dimm supports both PMEM and BLK access a label is required */
NDD_ALIASING = 0,
/* unarmed memory devices may not persist writes */
NDD_UNARMED = 1,
/* locked memory devices should not be accessed */
NDD_LOCKED = 2,
/* memory under security wipes should not be accessed */
NDD_SECURITY_OVERWRITE = 3,
/* tracking whether or not there is a pending device reference */
NDD_WORK_PENDING = 4,
/* need to set a limit somewhere, but yes, this is likely overkill */
ND_IOCTL_MAX_BUFLEN = SZ_4M,
ND_CMD_MAX_ELEM = 5,
ND_CMD_MAX_ENVELOPE = 256,
ND_MAX_MAPPINGS = 32,
/* region flag indicating to direct-map persistent memory by default */
ND_REGION_PAGEMAP = 0,
/*
* Platform ensures entire CPU store data path is flushed to pmem on
* system power loss.
*/
ND_REGION_PERSIST_CACHE = 1,
/*
* Platform provides mechanisms to automatically flush outstanding
* write data from memory controler to pmem on system power loss.
* (ADR)
*/
ND_REGION_PERSIST_MEMCTRL = 2,
/* mark newly adjusted resources as requiring a label update */
DPA_RESOURCE_ADJUSTED = 1 << 0,
};
extern struct attribute_group nvdimm_bus_attribute_group;
extern struct attribute_group nvdimm_attribute_group;
extern struct attribute_group nd_device_attribute_group;
extern struct attribute_group nd_numa_attribute_group;
extern struct attribute_group nd_region_attribute_group;
extern struct attribute_group nd_mapping_attribute_group;
struct nvdimm;
struct nvdimm_bus_descriptor;
typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len, int *cmd_rc);
struct nvdimm_bus_descriptor {
const struct attribute_group **attr_groups;
unsigned long bus_dsm_mask;
unsigned long cmd_mask;
struct module *module;
char *provider_name;
ndctl_fn ndctl;
int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *data);
};
struct nd_cmd_desc {
int in_num;
int out_num;
u32 in_sizes[ND_CMD_MAX_ELEM];
int out_sizes[ND_CMD_MAX_ELEM];
};
struct nd_interleave_set {
/* v1.1 definition of the interleave-set-cookie algorithm */
u64 cookie1;
/* v1.2 definition of the interleave-set-cookie algorithm */
u64 cookie2;
/* compatibility with initial buggy Linux implementation */
u64 altcookie;
guid_t type_guid;
};
struct nd_mapping_desc {
struct nvdimm *nvdimm;
u64 start;
u64 size;
int position;
};
struct nd_region_desc {
struct resource *res;
struct nd_mapping_desc *mapping;
u16 num_mappings;
const struct attribute_group **attr_groups;
struct nd_interleave_set *nd_set;
void *provider_data;
int num_lanes;
int numa_node;
unsigned long flags;
};
struct device;
void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
size_t size, unsigned long flags);
static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
resource_size_t offset, size_t size)
{
return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
}
struct nvdimm_bus;
struct module;
struct device;
struct nd_blk_region;
struct nd_blk_region_desc {
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);
struct nd_region_desc ndr_desc;
};
static inline struct nd_blk_region_desc *to_blk_region_desc(
struct nd_region_desc *ndr_desc)
{
return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
}
/*
* Note that separate bits for locked + unlocked are defined so that
* 'flags == 0' corresponds to an error / not-supported state.
*/
enum nvdimm_security_bits {
NVDIMM_SECURITY_DISABLED,
NVDIMM_SECURITY_UNLOCKED,
NVDIMM_SECURITY_LOCKED,
NVDIMM_SECURITY_FROZEN,
NVDIMM_SECURITY_OVERWRITE,
};
#define NVDIMM_PASSPHRASE_LEN 32
#define NVDIMM_KEY_DESC_LEN 22
struct nvdimm_key_data {
u8 data[NVDIMM_PASSPHRASE_LEN];
};
enum nvdimm_passphrase_type {
NVDIMM_USER,
NVDIMM_MASTER,
};
struct nvdimm_security_ops {
unsigned long (*get_flags)(struct nvdimm *nvdimm,
enum nvdimm_passphrase_type pass_type);
int (*freeze)(struct nvdimm *nvdimm);
int (*change_key)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *old_data,
const struct nvdimm_key_data *new_data,
enum nvdimm_passphrase_type pass_type);
int (*unlock)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data);
int (*disable)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data);
int (*erase)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data,
enum nvdimm_passphrase_type pass_type);
int (*overwrite)(struct nvdimm *nvdimm,
const struct nvdimm_key_data *key_data);
int (*query_overwrite)(struct nvdimm *nvdimm);
};
void badrange_init(struct badrange *badrange);
int badrange_add(struct badrange *badrange, u64 addr, u64 length);
void badrange_forget(struct badrange *badrange, phys_addr_t start,
unsigned int len);
int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr,
u64 length);
struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
struct nvdimm_bus_descriptor *nfit_desc);
void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm);
struct nvdimm *to_nvdimm(struct device *dev);
struct nd_region *to_nd_region(struct device *dev);
struct device *nd_region_dev(struct nd_region *nd_region);
struct nd_blk_region *to_nd_blk_region(struct device *dev);
struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
const char *nvdimm_name(struct nvdimm *nvdimm);
struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
void *nvdimm_provider_data(struct nvdimm *nvdimm);
struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
void *provider_data, const struct attribute_group **groups,
unsigned long flags, unsigned long cmd_mask, int num_flush,
struct resource *flush_wpq, const char *dimm_id,
const struct nvdimm_security_ops *sec_ops);
static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
void *provider_data, const struct attribute_group **groups,
unsigned long flags, unsigned long cmd_mask, int num_flush,
struct resource *flush_wpq)
{
return __nvdimm_create(nvdimm_bus, provider_data, groups, flags,
cmd_mask, num_flush, flush_wpq, NULL, NULL);
}
const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
const struct nd_cmd_desc *desc, int idx, void *buf);
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
const u32 *out_field, unsigned long remainder);
int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
void *nd_region_provider_data(struct nd_region *nd_region);
void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
u64 nd_fletcher64(void *addr, size_t len, bool le);
void nvdimm_flush(struct nd_region *nd_region);
int nvdimm_has_flush(struct nd_region *nd_region);
int nvdimm_has_cache(struct nd_region *nd_region);
int nvdimm_in_overwrite(struct nvdimm *nvdimm);
static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len, int *cmd_rc)
{
struct nvdimm_bus *nvdimm_bus = nvdimm_to_bus(nvdimm);
struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
return nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, cmd_rc);
}
#endif /* __LIBNVDIMM_H__ */
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