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/*
* 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 __LINUX_ND_H__
#define __LINUX_ND_H__
#include <linux/fs.h>
#include <linux/ndctl.h>
#include <linux/device.h>
struct nd_device_driver {
struct device_driver drv;
unsigned long type;
int (*probe)(struct device *dev);
int (*remove)(struct device *dev);
};
static inline struct nd_device_driver *to_nd_device_driver(
struct device_driver *drv)
{
return container_of(drv, struct nd_device_driver, drv);
};
/**
* struct nd_namespace_common - core infrastructure of a namespace
* @force_raw: ignore other personalities for the namespace (e.g. btt)
* @dev: device model node
* @claim: when set a another personality has taken ownership of the namespace
* @rw_bytes: access the raw namespace capacity with byte-aligned transfers
*/
struct nd_namespace_common {
int force_raw;
struct device dev;
struct device *claim;
int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
void *buf, size_t size, int rw);
};
static inline struct nd_namespace_common *to_ndns(struct device *dev)
{
return container_of(dev, struct nd_namespace_common, dev);
}
/**
* struct nd_namespace_io - infrastructure for loading an nd_pmem instance
* @dev: namespace device created by the nd region driver
* @res: struct resource conversion of a NFIT SPA table
*/
struct nd_namespace_io {
struct nd_namespace_common common;
struct resource res;
};
/**
* struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
* @nsio: device and system physical address range to drive
* @alt_name: namespace name supplied in the dimm label
* @uuid: namespace name supplied in the dimm label
*/
struct nd_namespace_pmem {
struct nd_namespace_io nsio;
char *alt_name;
u8 *uuid;
};
/**
* struct nd_namespace_blk - namespace for dimm-bounded persistent memory
* @alt_name: namespace name supplied in the dimm label
* @uuid: namespace name supplied in the dimm label
* @id: ida allocated id
* @lbasize: blk namespaces have a native sector size when btt not present
* @num_resources: number of dpa extents to claim
* @res: discontiguous dpa extents for given dimm
*/
struct nd_namespace_blk {
struct nd_namespace_common common;
char *alt_name;
u8 *uuid;
int id;
unsigned long lbasize;
int num_resources;
struct resource **res;
};
static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
{
return container_of(dev, struct nd_namespace_io, common.dev);
}
static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
return container_of(nsio, struct nd_namespace_pmem, nsio);
}
static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
{
return container_of(dev, struct nd_namespace_blk, common.dev);
}
/**
* nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
* @ndns: device to read
* @offset: namespace-relative starting offset
* @buf: buffer to fill
* @size: transfer length
*
* @buf is up-to-date upon return from this routine.
*/
static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size)
{
return ndns->rw_bytes(ndns, offset, buf, size, READ);
}
/**
* nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
* @ndns: device to read
* @offset: namespace-relative starting offset
* @buf: buffer to drain
* @size: transfer length
*
* NVDIMM Namepaces disks do not implement sectors internally. Depending on
* the @ndns, the contents of @buf may be in cpu cache, platform buffers,
* or on backing memory media upon return from this routine. Flushing
* to media is handled internal to the @ndns driver, if at all.
*/
static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size)
{
return ndns->rw_bytes(ndns, offset, buf, size, WRITE);
}
#define MODULE_ALIAS_ND_DEVICE(type) \
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
struct module *module, const char *mod_name);
#define nd_driver_register(driver) \
__nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
#endif /* __LINUX_ND_H__ */
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