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 request_queue;
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 
38 	ssize_t (*set_configfs_dev_params)(struct se_device *,
39 					   const char *, ssize_t);
40 	ssize_t (*show_configfs_dev_params)(struct se_device *, char *);
41 
42 	sense_reason_t (*parse_cdb)(struct se_cmd *cmd);
43 	void (*tmr_notify)(struct se_device *se_dev, enum tcm_tmreq_table,
44 			   struct list_head *aborted_cmds);
45 	u32 (*get_device_type)(struct se_device *);
46 	sector_t (*get_blocks)(struct se_device *);
47 	sector_t (*get_alignment_offset_lbas)(struct se_device *);
48 	/* lbppbe = logical blocks per physical block exponent. see SBC-3 */
49 	unsigned int (*get_lbppbe)(struct se_device *);
50 	unsigned int (*get_io_min)(struct se_device *);
51 	unsigned int (*get_io_opt)(struct se_device *);
52 	unsigned char *(*get_sense_buffer)(struct se_cmd *);
53 	bool (*get_write_cache)(struct se_device *);
54 	int (*init_prot)(struct se_device *);
55 	int (*format_prot)(struct se_device *);
56 	void (*free_prot)(struct se_device *);
57 
58 	struct configfs_attribute **tb_dev_attrib_attrs;
59 	struct configfs_attribute **tb_dev_action_attrs;
60 };
61 
62 struct sbc_ops {
63 	sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *,
64 				     u32, enum dma_data_direction);
65 	sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd);
66 	sense_reason_t (*execute_write_same)(struct se_cmd *cmd);
67 	sense_reason_t (*execute_unmap)(struct se_cmd *cmd,
68 				sector_t lba, sector_t nolb);
69 };
70 
71 int	transport_backend_register(const struct target_backend_ops *);
72 void	target_backend_unregister(const struct target_backend_ops *);
73 
74 void	target_complete_cmd(struct se_cmd *, u8);
75 void	target_set_cmd_data_length(struct se_cmd *, int);
76 void	target_complete_cmd_with_length(struct se_cmd *, u8, int);
77 
78 void	transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);
79 
80 sense_reason_t	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
81 sense_reason_t	spc_emulate_report_luns(struct se_cmd *cmd);
82 sense_reason_t	spc_emulate_inquiry_std(struct se_cmd *, unsigned char *);
83 sense_reason_t	spc_emulate_evpd_83(struct se_cmd *, unsigned char *);
84 
85 sense_reason_t	sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops);
86 u32	sbc_get_device_rev(struct se_device *dev);
87 u32	sbc_get_device_type(struct se_device *dev);
88 sector_t	sbc_get_write_same_sectors(struct se_cmd *cmd);
89 void	sbc_dif_generate(struct se_cmd *);
90 sense_reason_t	sbc_dif_verify(struct se_cmd *, sector_t, unsigned int,
91 				     unsigned int, struct scatterlist *, int);
92 void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool,
93 		       struct scatterlist *, int);
94 void	transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
95 int	transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
96 int	transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
97 int	transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
98 
99 extern struct configfs_attribute *sbc_attrib_attrs[];
100 extern struct configfs_attribute *passthrough_attrib_attrs[];
101 extern struct configfs_attribute *passthrough_pr_attrib_attrs[];
102 
103 /* core helpers also used by command snooping in pscsi */
104 void	*transport_kmap_data_sg(struct se_cmd *);
105 void	transport_kunmap_data_sg(struct se_cmd *);
106 /* core helpers also used by xcopy during internal command setup */
107 sense_reason_t	transport_generic_map_mem_to_cmd(struct se_cmd *,
108 		struct scatterlist *, u32, struct scatterlist *, u32);
109 
110 bool	target_lun_is_rdonly(struct se_cmd *);
111 sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
112 	sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
113 
114 bool target_sense_desc_format(struct se_device *dev);
115 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
116 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
117 				       struct request_queue *q);
118 
119 static inline bool target_dev_configured(struct se_device *se_dev)
120 {
121 	return !!(se_dev->dev_flags & DF_CONFIGURED);
122 }
123 
124 #endif /* TARGET_CORE_BACKEND_H */
125