include/linux/libnvdimm.h

   1 /*
   2  * libnvdimm - Non-volatile-memory Devices Subsystem
   3  *
   4  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  */
  15 #ifndef __LIBNVDIMM_H__
  16 #define __LIBNVDIMM_H__
  17 #include <linux/kernel.h>
  18 #include <linux/sizes.h>
  19 #include <linux/types.h>
  20
  21 enum {
  22         /* when a dimm supports both PMEM and BLK access a label is required */
  23         NDD_ALIASING = 1 << 0,
  24         /* unarmed memory devices may not persist writes */
  25         NDD_UNARMED = 1 << 1,
  26
  27         /* need to set a limit somewhere, but yes, this is likely overkill */
  28         ND_IOCTL_MAX_BUFLEN = SZ_4M,
  29         ND_CMD_MAX_ELEM = 5,
  30         ND_CMD_MAX_ENVELOPE = 16,
  31         ND_MAX_MAPPINGS = 32,
  32
  33         /* region flag indicating to direct-map persistent memory by default */
  34         ND_REGION_PAGEMAP = 0,
  35
  36         /* mark newly adjusted resources as requiring a label update */
  37         DPA_RESOURCE_ADJUSTED = 1 << 0,
  38 };
  39
  40 extern struct attribute_group nvdimm_bus_attribute_group;
  41 extern struct attribute_group nvdimm_attribute_group;
  42 extern struct attribute_group nd_device_attribute_group;
  43 extern struct attribute_group nd_numa_attribute_group;
  44 extern struct attribute_group nd_region_attribute_group;
  45 extern struct attribute_group nd_mapping_attribute_group;
  46
  47 struct nvdimm;
  48 struct nvdimm_bus_descriptor;
  49 typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
  50                 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
  51                 unsigned int buf_len, int *cmd_rc);
  52
  53 struct nd_namespace_label;
  54 struct nvdimm_drvdata;
  55 struct nd_mapping {
  56         struct nvdimm *nvdimm;
  57         struct nd_namespace_label **labels;
  58         u64 start;
  59         u64 size;
  60         /*
  61          * @ndd is for private use at region enable / disable time for
  62          * get_ndd() + put_ndd(), all other nd_mapping to ndd
  63          * conversions use to_ndd() which respects enabled state of the
  64          * nvdimm.
  65          */
  66         struct nvdimm_drvdata *ndd;
  67 };
  68
  69 struct nvdimm_bus_descriptor {
  70         const struct attribute_group **attr_groups;
  71         unsigned long dsm_mask;
  72         char *provider_name;
  73         ndctl_fn ndctl;
  74         int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
  75         int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
  76                         struct nvdimm *nvdimm, unsigned int cmd);
  77 };
  78
  79 struct nd_cmd_desc {
  80         int in_num;
  81         int out_num;
  82         u32 in_sizes[ND_CMD_MAX_ELEM];
  83         int out_sizes[ND_CMD_MAX_ELEM];
  84 };
  85
  86 struct nd_interleave_set {
  87         u64 cookie;
  88 };
  89
  90 struct nd_region_desc {
  91         struct resource *res;
  92         struct nd_mapping *nd_mapping;
  93         u16 num_mappings;
  94         const struct attribute_group **attr_groups;
  95         struct nd_interleave_set *nd_set;
  96         void *provider_data;
  97         int num_lanes;
  98         int numa_node;
  99         unsigned long flags;
 100 };
 101
 102 struct nvdimm_bus;
 103 struct module;
 104 struct device;
 105 struct nd_blk_region;
 106 struct nd_blk_region_desc {
 107         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 108         void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 109         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 110                         void *iobuf, u64 len, int rw);
 111         struct nd_region_desc ndr_desc;
 112 };
 113
 114 static inline struct nd_blk_region_desc *to_blk_region_desc(
 115                 struct nd_region_desc *ndr_desc)
 116 {
 117         return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
 118
 119 }
 120
 121 int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length);
 122 struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
 123                 struct nvdimm_bus_descriptor *nfit_desc, struct module *module);
 124 #define nvdimm_bus_register(parent, desc) \
 125         __nvdimm_bus_register(parent, desc, THIS_MODULE)
 126 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
 127 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
 128 struct nvdimm *to_nvdimm(struct device *dev);
 129 struct nd_region *to_nd_region(struct device *dev);
 130 struct nd_blk_region *to_nd_blk_region(struct device *dev);
 131 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
 132 const char *nvdimm_name(struct nvdimm *nvdimm);
 133 void *nvdimm_provider_data(struct nvdimm *nvdimm);
 134 struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
 135                 const struct attribute_group **groups, unsigned long flags,
 136                 unsigned long *dsm_mask);
 137 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
 138 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
 139 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 140                 const struct nd_cmd_desc *desc, int idx, void *buf);
 141 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 142                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 143                 const u32 *out_field);
 144 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
 145 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
 146                 struct nd_region_desc *ndr_desc);
 147 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 148                 struct nd_region_desc *ndr_desc);
 149 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 150                 struct nd_region_desc *ndr_desc);
 151 void *nd_region_provider_data(struct nd_region *nd_region);
 152 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
 153 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
 154 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
 155 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
 156 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
 157 u64 nd_fletcher64(void *addr, size_t len, bool le);
 158 #endif /* __LIBNVDIMM_H__ */