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