include/linux/nd.h

   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 __LINUX_ND_H__
  14 #define __LINUX_ND_H__
  15 #include <linux/fs.h>
  16 #include <linux/ndctl.h>
  17 #include <linux/device.h>
  18
  19 struct nd_device_driver {
  20         struct device_driver drv;
  21         unsigned long type;
  22         int (*probe)(struct device *dev);
  23         int (*remove)(struct device *dev);
  24 };
  25
  26 static inline struct nd_device_driver *to_nd_device_driver(
  27                 struct device_driver *drv)
  28 {
  29         return container_of(drv, struct nd_device_driver, drv);
  30 };
  31
  32 /**
  33  * struct nd_namespace_common - core infrastructure of a namespace
  34  * @force_raw: ignore other personalities for the namespace (e.g. btt)
  35  * @dev: device model node
  36  * @claim: when set a another personality has taken ownership of the namespace
  37  * @rw_bytes: access the raw namespace capacity with byte-aligned transfers
  38  */
  39 struct nd_namespace_common {
  40         int force_raw;
  41         struct device dev;
  42         struct device *claim;
  43         int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
  44                         void *buf, size_t size, int rw);
  45 };
  46
  47 static inline struct nd_namespace_common *to_ndns(struct device *dev)
  48 {
  49         return container_of(dev, struct nd_namespace_common, dev);
  50 }
  51
  52 /**
  53  * struct nd_namespace_io - infrastructure for loading an nd_pmem instance
  54  * @dev: namespace device created by the nd region driver
  55  * @res: struct resource conversion of a NFIT SPA table
  56  */
  57 struct nd_namespace_io {
  58         struct nd_namespace_common common;
  59         struct resource res;
  60 };
  61
  62 /**
  63  * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
  64  * @nsio: device and system physical address range to drive
  65  * @alt_name: namespace name supplied in the dimm label
  66  * @uuid: namespace name supplied in the dimm label
  67  */
  68 struct nd_namespace_pmem {
  69         struct nd_namespace_io nsio;
  70         char *alt_name;
  71         u8 *uuid;
  72 };
  73
  74 /**
  75  * struct nd_namespace_blk - namespace for dimm-bounded persistent memory
  76  * @alt_name: namespace name supplied in the dimm label
  77  * @uuid: namespace name supplied in the dimm label
  78  * @id: ida allocated id
  79  * @lbasize: blk namespaces have a native sector size when btt not present
  80  * @num_resources: number of dpa extents to claim
  81  * @res: discontiguous dpa extents for given dimm
  82  */
  83 struct nd_namespace_blk {
  84         struct nd_namespace_common common;
  85         char *alt_name;
  86         u8 *uuid;
  87         int id;
  88         unsigned long lbasize;
  89         int num_resources;
  90         struct resource **res;
  91 };
  92
  93 static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
  94 {
  95         return container_of(dev, struct nd_namespace_io, common.dev);
  96 }
  97
  98 static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
  99 {
 100         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
 101
 102         return container_of(nsio, struct nd_namespace_pmem, nsio);
 103 }
 104
 105 static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
 106 {
 107         return container_of(dev, struct nd_namespace_blk, common.dev);
 108 }
 109
 110 /**
 111  * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
 112  * @ndns: device to read
 113  * @offset: namespace-relative starting offset
 114  * @buf: buffer to fill
 115  * @size: transfer length
 116  *
 117  * @buf is up-to-date upon return from this routine.
 118  */
 119 static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
 120                 resource_size_t offset, void *buf, size_t size)
 121 {
 122         return ndns->rw_bytes(ndns, offset, buf, size, READ);
 123 }
 124
 125 /**
 126  * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
 127  * @ndns: device to read
 128  * @offset: namespace-relative starting offset
 129  * @buf: buffer to drain
 130  * @size: transfer length
 131  *
 132  * NVDIMM Namepaces disks do not implement sectors internally.  Depending on
 133  * the @ndns, the contents of @buf may be in cpu cache, platform buffers,
 134  * or on backing memory media upon return from this routine.  Flushing
 135  * to media is handled internal to the @ndns driver, if at all.
 136  */
 137 static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
 138                 resource_size_t offset, void *buf, size_t size)
 139 {
 140         return ndns->rw_bytes(ndns, offset, buf, size, WRITE);
 141 }
 142
 143 #define MODULE_ALIAS_ND_DEVICE(type) \
 144         MODULE_ALIAS("nd:t" __stringify(type) "*")
 145 #define ND_DEVICE_MODALIAS_FMT "nd:t%d"
 146
 147 int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
 148                 struct module *module, const char *mod_name);
 149 #define nd_driver_register(driver) \
 150         __nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 151 #endif /* __LINUX_ND_H__ */