1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4  */
5 #ifndef __LINUX_ND_H__
6 #define __LINUX_ND_H__
7 #include <linux/fs.h>
8 #include <linux/ndctl.h>
9 #include <linux/device.h>
10 #include <linux/badblocks.h>
11 
12 enum nvdimm_event {
13 	NVDIMM_REVALIDATE_POISON,
14 };
15 
16 enum nvdimm_claim_class {
17 	NVDIMM_CCLASS_NONE,
18 	NVDIMM_CCLASS_BTT,
19 	NVDIMM_CCLASS_BTT2,
20 	NVDIMM_CCLASS_PFN,
21 	NVDIMM_CCLASS_DAX,
22 	NVDIMM_CCLASS_UNKNOWN,
23 };
24 
25 struct nd_device_driver {
26 	struct device_driver drv;
27 	unsigned long type;
28 	int (*probe)(struct device *dev);
29 	int (*remove)(struct device *dev);
30 	void (*shutdown)(struct device *dev);
31 	void (*notify)(struct device *dev, enum nvdimm_event event);
32 };
33 
to_nd_device_driver(struct device_driver * drv)34 static inline struct nd_device_driver *to_nd_device_driver(
35 		struct device_driver *drv)
36 {
37 	return container_of(drv, struct nd_device_driver, drv);
38 };
39 
40 /**
41  * struct nd_namespace_common - core infrastructure of a namespace
42  * @force_raw: ignore other personalities for the namespace (e.g. btt)
43  * @dev: device model node
44  * @claim: when set a another personality has taken ownership of the namespace
45  * @claim_class: restrict claim type to a given class
46  * @rw_bytes: access the raw namespace capacity with byte-aligned transfers
47  */
48 struct nd_namespace_common {
49 	int force_raw;
50 	struct device dev;
51 	struct device *claim;
52 	enum nvdimm_claim_class claim_class;
53 	int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
54 			void *buf, size_t size, int rw, unsigned long flags);
55 };
56 
to_ndns(struct device * dev)57 static inline struct nd_namespace_common *to_ndns(struct device *dev)
58 {
59 	return container_of(dev, struct nd_namespace_common, dev);
60 }
61 
62 /**
63  * struct nd_namespace_io - device representation of a persistent memory range
64  * @dev: namespace device created by the nd region driver
65  * @res: struct resource conversion of a NFIT SPA table
66  * @size: cached resource_size(@res) for fast path size checks
67  * @addr: virtual address to access the namespace range
68  * @bb: badblocks list for the namespace range
69  */
70 struct nd_namespace_io {
71 	struct nd_namespace_common common;
72 	struct resource res;
73 	resource_size_t size;
74 	void *addr;
75 	struct badblocks bb;
76 };
77 
78 /**
79  * struct nd_namespace_pmem - namespace device for dimm-backed interleaved memory
80  * @nsio: device and system physical address range to drive
81  * @lbasize: logical sector size for the namespace in block-device-mode
82  * @alt_name: namespace name supplied in the dimm label
83  * @uuid: namespace name supplied in the dimm label
84  * @id: ida allocated id
85  */
86 struct nd_namespace_pmem {
87 	struct nd_namespace_io nsio;
88 	unsigned long lbasize;
89 	char *alt_name;
90 	u8 *uuid;
91 	int id;
92 };
93 
94 /**
95  * struct nd_namespace_blk - namespace for dimm-bounded persistent memory
96  * @alt_name: namespace name supplied in the dimm label
97  * @uuid: namespace name supplied in the dimm label
98  * @id: ida allocated id
99  * @lbasize: blk namespaces have a native sector size when btt not present
100  * @size: sum of all the resource ranges allocated to this namespace
101  * @num_resources: number of dpa extents to claim
102  * @res: discontiguous dpa extents for given dimm
103  */
104 struct nd_namespace_blk {
105 	struct nd_namespace_common common;
106 	char *alt_name;
107 	u8 *uuid;
108 	int id;
109 	unsigned long lbasize;
110 	resource_size_t size;
111 	int num_resources;
112 	struct resource **res;
113 };
114 
to_nd_namespace_io(const struct device * dev)115 static inline struct nd_namespace_io *to_nd_namespace_io(const struct device *dev)
116 {
117 	return container_of(dev, struct nd_namespace_io, common.dev);
118 }
119 
to_nd_namespace_pmem(const struct device * dev)120 static inline struct nd_namespace_pmem *to_nd_namespace_pmem(const struct device *dev)
121 {
122 	struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
123 
124 	return container_of(nsio, struct nd_namespace_pmem, nsio);
125 }
126 
to_nd_namespace_blk(const struct device * dev)127 static inline struct nd_namespace_blk *to_nd_namespace_blk(const struct device *dev)
128 {
129 	return container_of(dev, struct nd_namespace_blk, common.dev);
130 }
131 
132 /**
133  * nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
134  * @ndns: device to read
135  * @offset: namespace-relative starting offset
136  * @buf: buffer to fill
137  * @size: transfer length
138  *
139  * @buf is up-to-date upon return from this routine.
140  */
nvdimm_read_bytes(struct nd_namespace_common * ndns,resource_size_t offset,void * buf,size_t size,unsigned long flags)141 static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
142 		resource_size_t offset, void *buf, size_t size,
143 		unsigned long flags)
144 {
145 	return ndns->rw_bytes(ndns, offset, buf, size, READ, flags);
146 }
147 
148 /**
149  * nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
150  * @ndns: device to write
151  * @offset: namespace-relative starting offset
152  * @buf: buffer to drain
153  * @size: transfer length
154  *
155  * NVDIMM Namepaces disks do not implement sectors internally.  Depending on
156  * the @ndns, the contents of @buf may be in cpu cache, platform buffers,
157  * or on backing memory media upon return from this routine.  Flushing
158  * to media is handled internal to the @ndns driver, if at all.
159  */
nvdimm_write_bytes(struct nd_namespace_common * ndns,resource_size_t offset,void * buf,size_t size,unsigned long flags)160 static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
161 		resource_size_t offset, void *buf, size_t size,
162 		unsigned long flags)
163 {
164 	return ndns->rw_bytes(ndns, offset, buf, size, WRITE, flags);
165 }
166 
167 #define MODULE_ALIAS_ND_DEVICE(type) \
168 	MODULE_ALIAS("nd:t" __stringify(type) "*")
169 #define ND_DEVICE_MODALIAS_FMT "nd:t%d"
170 
171 struct nd_region;
172 void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event);
173 int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
174 		struct module *module, const char *mod_name);
nd_driver_unregister(struct nd_device_driver * drv)175 static inline void nd_driver_unregister(struct nd_device_driver *drv)
176 {
177 	driver_unregister(&drv->drv);
178 }
179 #define nd_driver_register(driver) \
180 	__nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
181 #define module_nd_driver(driver) \
182 	module_driver(driver, nd_driver_register, nd_driver_unregister)
183 #endif /* __LINUX_ND_H__ */
184