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 #include <linux/uuid.h>
  21
  22 enum {
  23         /* when a dimm supports both PMEM and BLK access a label is required */
  24         NDD_ALIASING = 0,
  25         /* unarmed memory devices may not persist writes */
  26         NDD_UNARMED = 1,
  27         /* locked memory devices should not be accessed */
  28         NDD_LOCKED = 2,
  29
  30         /* need to set a limit somewhere, but yes, this is likely overkill */
  31         ND_IOCTL_MAX_BUFLEN = SZ_4M,
  32         ND_CMD_MAX_ELEM = 5,
  33         ND_CMD_MAX_ENVELOPE = 256,
  34         ND_MAX_MAPPINGS = 32,
  35
  36         /* region flag indicating to direct-map persistent memory by default */
  37         ND_REGION_PAGEMAP = 0,
  38
  39         /* mark newly adjusted resources as requiring a label update */
  40         DPA_RESOURCE_ADJUSTED = 1 << 0,
  41 };
  42
  43 extern struct attribute_group nvdimm_bus_attribute_group;
  44 extern struct attribute_group nvdimm_attribute_group;
  45 extern struct attribute_group nd_device_attribute_group;
  46 extern struct attribute_group nd_numa_attribute_group;
  47 extern struct attribute_group nd_region_attribute_group;
  48 extern struct attribute_group nd_mapping_attribute_group;
  49
  50 struct nvdimm;
  51 struct nvdimm_bus_descriptor;
  52 typedef int (*ndctl_fn)(struct nvdimm_bus_descriptor *nd_desc,
  53                 struct nvdimm *nvdimm, unsigned int cmd, void *buf,
  54                 unsigned int buf_len, int *cmd_rc);
  55
  56 struct nvdimm_bus_descriptor {
  57         const struct attribute_group **attr_groups;
  58         unsigned long bus_dsm_mask;
  59         unsigned long cmd_mask;
  60         struct module *module;
  61         char *provider_name;
  62         ndctl_fn ndctl;
  63         int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc);
  64         int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc,
  65                         struct nvdimm *nvdimm, unsigned int cmd);
  66 };
  67
  68 struct nd_cmd_desc {
  69         int in_num;
  70         int out_num;
  71         u32 in_sizes[ND_CMD_MAX_ELEM];
  72         int out_sizes[ND_CMD_MAX_ELEM];
  73 };
  74
  75 struct nd_interleave_set {
  76         /* v1.1 definition of the interleave-set-cookie algorithm */
  77         u64 cookie1;
  78         /* v1.2 definition of the interleave-set-cookie algorithm */
  79         u64 cookie2;
  80         /* compatibility with initial buggy Linux implementation */
  81         u64 altcookie;
  82
  83         guid_t type_guid;
  84 };
  85
  86 struct nd_mapping_desc {
  87         struct nvdimm *nvdimm;
  88         u64 start;
  89         u64 size;
  90         int position;
  91 };
  92
  93 struct nd_region_desc {
  94         struct resource *res;
  95         struct nd_mapping_desc *mapping;
  96         u16 num_mappings;
  97         const struct attribute_group **attr_groups;
  98         struct nd_interleave_set *nd_set;
  99         void *provider_data;
 100         int num_lanes;
 101         int numa_node;
 102         unsigned long flags;
 103 };
 104
 105 struct device;
 106 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
 107                 size_t size, unsigned long flags);
 108 static inline void __iomem *devm_nvdimm_ioremap(struct device *dev,
 109                 resource_size_t offset, size_t size)
 110 {
 111         return (void __iomem *) devm_nvdimm_memremap(dev, offset, size, 0);
 112 }
 113
 114 struct nvdimm_bus;
 115 struct module;
 116 struct device;
 117 struct nd_blk_region;
 118 struct nd_blk_region_desc {
 119         int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 120         int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 121                         void *iobuf, u64 len, int rw);
 122         struct nd_region_desc ndr_desc;
 123 };
 124
 125 static inline struct nd_blk_region_desc *to_blk_region_desc(
 126                 struct nd_region_desc *ndr_desc)
 127 {
 128         return container_of(ndr_desc, struct nd_blk_region_desc, ndr_desc);
 129
 130 }
 131
 132 int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length);
 133 void nvdimm_forget_poison(struct nvdimm_bus *nvdimm_bus,
 134                 phys_addr_t start, unsigned int len);
 135 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
 136                 struct nvdimm_bus_descriptor *nfit_desc);
 137 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus);
 138 struct nvdimm_bus *to_nvdimm_bus(struct device *dev);
 139 struct nvdimm *to_nvdimm(struct device *dev);
 140 struct nd_region *to_nd_region(struct device *dev);
 141 struct nd_blk_region *to_nd_blk_region(struct device *dev);
 142 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus);
 143 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus);
 144 const char *nvdimm_name(struct nvdimm *nvdimm);
 145 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm);
 146 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm);
 147 void *nvdimm_provider_data(struct nvdimm *nvdimm);
 148 struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
 149                 const struct attribute_group **groups, unsigned long flags,
 150                 unsigned long cmd_mask, int num_flush,
 151                 struct resource *flush_wpq);
 152 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
 153 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);
 154 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 155                 const struct nd_cmd_desc *desc, int idx, void *buf);
 156 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 157                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 158                 const u32 *out_field, unsigned long remainder);
 159 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
 160 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
 161                 struct nd_region_desc *ndr_desc);
 162 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 163                 struct nd_region_desc *ndr_desc);
 164 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 165                 struct nd_region_desc *ndr_desc);
 166 void *nd_region_provider_data(struct nd_region *nd_region);
 167 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
 168 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
 169 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr);
 170 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr);
 171 unsigned int nd_region_acquire_lane(struct nd_region *nd_region);
 172 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane);
 173 u64 nd_fletcher64(void *addr, size_t len, bool le);
 174 void nvdimm_flush(struct nd_region *nd_region);
 175 int nvdimm_has_flush(struct nd_region *nd_region);
 176 int nvdimm_has_cache(struct nd_region *nd_region);
 177
 178 #ifdef CONFIG_ARCH_HAS_PMEM_API
 179 #define ARCH_MEMREMAP_PMEM MEMREMAP_WB
 180 void arch_wb_cache_pmem(void *addr, size_t size);
 181 void arch_invalidate_pmem(void *addr, size_t size);
 182 #else
 183 #define ARCH_MEMREMAP_PMEM MEMREMAP_WT
 184 static inline void arch_wb_cache_pmem(void *addr, size_t size)
 185 {
 186 }
 187 static inline void arch_invalidate_pmem(void *addr, size_t size)
 188 {
 189 }
 190 #endif
 191
 192 #endif /* __LIBNVDIMM_H__ */