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