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 #include <linux/badblocks.h>
  19
  20 enum nvdimm_event {
  21         NVDIMM_REVALIDATE_POISON,
  22 };
  23
  24 struct nd_device_driver {
  25         struct device_driver drv;
  26         unsigned long type;
  27         int (*probe)(struct device *dev);
  28         int (*remove)(struct device *dev);
  29         void (*shutdown)(struct device *dev);
  30         void (*notify)(struct device *dev, enum nvdimm_event event);
  31 };
  32
  33 static inline struct nd_device_driver *to_nd_device_driver(
  34                 struct device_driver *drv)
  35 {
  36         return container_of(drv, struct nd_device_driver, drv);
  37 };
  38
  39 /**
  40  * struct nd_namespace_common - core infrastructure of a namespace
  41  * @force_raw: ignore other personalities for the namespace (e.g. btt)
  42  * @dev: device model node
  43  * @claim: when set a another personality has taken ownership of the namespace
  44  * @rw_bytes: access the raw namespace capacity with byte-aligned transfers
  45  */
  46 struct nd_namespace_common {
  47         int force_raw;
  48         struct device dev;
  49         struct device *claim;
  50         int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
  51                         void *buf, size_t size, int rw);
  52 };
  53
  54 static inline struct nd_namespace_common *to_ndns(struct device *dev)
  55 {
  56         return container_of(dev, struct nd_namespace_common, dev);
  57 }
  58
  59 /**
  60  * struct nd_namespace_io - device representation of a persistent memory range
  61  * @dev: namespace device created by the nd region driver
  62  * @res: struct resource conversion of a NFIT SPA table
  63  * @size: cached resource_size(@res) for fast path size checks
  64  * @addr: virtual address to access the namespace range
  65  * @bb: badblocks list for the namespace range
  66  */
  67 struct nd_namespace_io {
  68         struct nd_namespace_common common;
  69         struct resource res;
  70         resource_size_t size;
  71         void *addr;
  72         struct badblocks bb;
  73 };
  74
  75 /**
  76  * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
  77  * @nsio: device and system physical address range to drive
  78  * @alt_name: namespace name supplied in the dimm label
  79  * @uuid: namespace name supplied in the dimm label
  80  */
  81 struct nd_namespace_pmem {
  82         struct nd_namespace_io nsio;
  83         char *alt_name;
  84         u8 *uuid;
  85 };
  86
  87 /**
  88  * struct nd_namespace_blk - namespace for dimm-bounded persistent memory
  89  * @alt_name: namespace name supplied in the dimm label
  90  * @uuid: namespace name supplied in the dimm label
  91  * @id: ida allocated id
  92  * @lbasize: blk namespaces have a native sector size when btt not present
  93  * @size: sum of all the resource ranges allocated to this namespace
  94  * @num_resources: number of dpa extents to claim
  95  * @res: discontiguous dpa extents for given dimm
  96  */
  97 struct nd_namespace_blk {
  98         struct nd_namespace_common common;
  99         char *alt_name;
 100         u8 *uuid;
 101         int id;
 102         unsigned long lbasize;
 103         resource_size_t size;
 104         int num_resources;
 105         struct resource **res;
 106 };
 107
 108 static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
 109 {
 110         return container_of(dev, struct nd_namespace_io, common.dev);
 111 }
 112
 113 static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
 114 {
 115         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
 116
 117         return container_of(nsio, struct nd_namespace_pmem, nsio);
 118 }
 119
 120 static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
 121 {
 122         return container_of(dev, struct nd_namespace_blk, common.dev);
 123 }
 124
 125 /**
 126  * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
 127  * @ndns: device to read
 128  * @offset: namespace-relative starting offset
 129  * @buf: buffer to fill
 130  * @size: transfer length
 131  *
 132  * @buf is up-to-date upon return from this routine.
 133  */
 134 static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
 135                 resource_size_t offset, void *buf, size_t size)
 136 {
 137         return ndns->rw_bytes(ndns, offset, buf, size, READ);
 138 }
 139
 140 /**
 141  * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
 142  * @ndns: device to read
 143  * @offset: namespace-relative starting offset
 144  * @buf: buffer to drain
 145  * @size: transfer length
 146  *
 147  * NVDIMM Namepaces disks do not implement sectors internally.  Depending on
 148  * the @ndns, the contents of @buf may be in cpu cache, platform buffers,
 149  * or on backing memory media upon return from this routine.  Flushing
 150  * to media is handled internal to the @ndns driver, if at all.
 151  */
 152 static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
 153                 resource_size_t offset, void *buf, size_t size)
 154 {
 155         return ndns->rw_bytes(ndns, offset, buf, size, WRITE);
 156 }
 157
 158 #define MODULE_ALIAS_ND_DEVICE(type) \
 159         MODULE_ALIAS("nd:t" __stringify(type) "*")
 160 #define ND_DEVICE_MODALIAS_FMT "nd:t%d"
 161
 162 struct nd_region;
 163 void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event);
 164 int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
 165                 struct module *module, const char *mod_name);
 166 #define nd_driver_register(driver) \
 167         __nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
 168 #endif /* __LINUX_ND_H__ */