1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef TARGET_CORE_BACKEND_H
3 #define TARGET_CORE_BACKEND_H
4
5 #include <linux/types.h>
6 #include <asm/unaligned.h>
7 #include <target/target_core_base.h>
8
9 #define TRANSPORT_FLAG_PASSTHROUGH 0x1
10 /*
11 * ALUA commands, state checks and setup operations are handled by the
12 * backend module.
13 */
14 #define TRANSPORT_FLAG_PASSTHROUGH_ALUA 0x2
15 #define TRANSPORT_FLAG_PASSTHROUGH_PGR 0x4
16
17 struct block_device;
18 struct scatterlist;
19
20 struct target_backend_ops {
21 char name[16];
22 char inquiry_prod[16];
23 char inquiry_rev[4];
24 struct module *owner;
25
26 u8 transport_flags_default;
27 u8 transport_flags_changeable;
28
29 int (*attach_hba)(struct se_hba *, u32);
30 void (*detach_hba)(struct se_hba *);
31 int (*pmode_enable_hba)(struct se_hba *, unsigned long);
32
33 struct se_device *(*alloc_device)(struct se_hba *, const char *);
34 int (*configure_device)(struct se_device *);
35 void (*destroy_device)(struct se_device *);
36 void (*free_device)(struct se_device *device);
37 struct se_dev_plug *(*plug_device)(struct se_device *se_dev);
38 void (*unplug_device)(struct se_dev_plug *se_plug);
39
40 bool (*configure_unmap)(struct se_device *se_dev);
41 ssize_t (*set_configfs_dev_params)(struct se_device *,
42 const char *, ssize_t);
43 ssize_t (*show_configfs_dev_params)(struct se_device *, char *);
44
45 sense_reason_t (*parse_cdb)(struct se_cmd *cmd);
46 void (*tmr_notify)(struct se_device *se_dev, enum tcm_tmreq_table,
47 struct list_head *aborted_cmds);
48 u32 (*get_device_type)(struct se_device *);
49 sector_t (*get_blocks)(struct se_device *);
50 sector_t (*get_alignment_offset_lbas)(struct se_device *);
51 /* lbppbe = logical blocks per physical block exponent. see SBC-3 */
52 unsigned int (*get_lbppbe)(struct se_device *);
53 unsigned int (*get_io_min)(struct se_device *);
54 unsigned int (*get_io_opt)(struct se_device *);
55 unsigned char *(*get_sense_buffer)(struct se_cmd *);
56 bool (*get_write_cache)(struct se_device *);
57 int (*init_prot)(struct se_device *);
58 int (*format_prot)(struct se_device *);
59 void (*free_prot)(struct se_device *);
60
61 struct configfs_attribute **tb_dev_attrib_attrs;
62 struct configfs_attribute **tb_dev_action_attrs;
63 };
64
65 struct sbc_ops {
66 sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *,
67 u32, enum dma_data_direction);
68 sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd);
69 sense_reason_t (*execute_write_same)(struct se_cmd *cmd);
70 sense_reason_t (*execute_unmap)(struct se_cmd *cmd,
71 sector_t lba, sector_t nolb);
72 };
73
74 int transport_backend_register(const struct target_backend_ops *);
75 void target_backend_unregister(const struct target_backend_ops *);
76
77 void target_complete_cmd(struct se_cmd *, u8);
78 void target_set_cmd_data_length(struct se_cmd *, int);
79 void target_complete_cmd_with_sense(struct se_cmd *, u8, sense_reason_t);
80 void target_complete_cmd_with_length(struct se_cmd *, u8, int);
81
82 void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);
83
84 sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
85 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd);
86 sense_reason_t spc_emulate_inquiry_std(struct se_cmd *, unsigned char *);
87 sense_reason_t spc_emulate_evpd_83(struct se_cmd *, unsigned char *);
88
89 sense_reason_t sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops);
90 u32 sbc_get_device_rev(struct se_device *dev);
91 u32 sbc_get_device_type(struct se_device *dev);
92 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd);
93 void sbc_dif_generate(struct se_cmd *);
94 sense_reason_t sbc_dif_verify(struct se_cmd *, sector_t, unsigned int,
95 unsigned int, struct scatterlist *, int);
96 void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool,
97 struct scatterlist *, int);
98 void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
99 int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
100 int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
101 int transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
102
103 extern struct configfs_attribute *sbc_attrib_attrs[];
104 extern struct configfs_attribute *passthrough_attrib_attrs[];
105 extern struct configfs_attribute *passthrough_pr_attrib_attrs[];
106
107 /* core helpers also used by command snooping in pscsi */
108 void *transport_kmap_data_sg(struct se_cmd *);
109 void transport_kunmap_data_sg(struct se_cmd *);
110 /* core helpers also used by xcopy during internal command setup */
111 sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *,
112 struct scatterlist *, u32, struct scatterlist *, u32);
113
114 bool target_lun_is_rdonly(struct se_cmd *);
115 sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
116 sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
117
118 bool target_sense_desc_format(struct se_device *dev);
119 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
120 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
121 struct block_device *bdev);
122
target_dev_configured(struct se_device * se_dev)123 static inline bool target_dev_configured(struct se_device *se_dev)
124 {
125 return !!(se_dev->dev_flags & DF_CONFIGURED);
126 }
127
128 #endif /* TARGET_CORE_BACKEND_H */
129