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 struct se_dev_plug *(*plug_device)(struct se_device *se_dev); 38 void (*unplug_device)(struct se_dev_plug *se_plug); 39 40 ssize_t (*set_configfs_dev_params)(struct se_device *, 41 const char *, ssize_t); 42 ssize_t (*show_configfs_dev_params)(struct se_device *, char *); 43 44 sense_reason_t (*parse_cdb)(struct se_cmd *cmd); 45 void (*tmr_notify)(struct se_device *se_dev, enum tcm_tmreq_table, 46 struct list_head *aborted_cmds); 47 u32 (*get_device_type)(struct se_device *); 48 sector_t (*get_blocks)(struct se_device *); 49 sector_t (*get_alignment_offset_lbas)(struct se_device *); 50 /* lbppbe = logical blocks per physical block exponent. see SBC-3 */ 51 unsigned int (*get_lbppbe)(struct se_device *); 52 unsigned int (*get_io_min)(struct se_device *); 53 unsigned int (*get_io_opt)(struct se_device *); 54 unsigned char *(*get_sense_buffer)(struct se_cmd *); 55 bool (*get_write_cache)(struct se_device *); 56 int (*init_prot)(struct se_device *); 57 int (*format_prot)(struct se_device *); 58 void (*free_prot)(struct se_device *); 59 60 struct configfs_attribute **tb_dev_attrib_attrs; 61 struct configfs_attribute **tb_dev_action_attrs; 62 }; 63 64 struct sbc_ops { 65 sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *, 66 u32, enum dma_data_direction); 67 sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd); 68 sense_reason_t (*execute_write_same)(struct se_cmd *cmd); 69 sense_reason_t (*execute_unmap)(struct se_cmd *cmd, 70 sector_t lba, sector_t nolb); 71 }; 72 73 int transport_backend_register(const struct target_backend_ops *); 74 void target_backend_unregister(const struct target_backend_ops *); 75 76 void target_complete_cmd(struct se_cmd *, u8); 77 void target_set_cmd_data_length(struct se_cmd *, int); 78 void target_complete_cmd_with_sense(struct se_cmd *, u8, sense_reason_t); 79 void target_complete_cmd_with_length(struct se_cmd *, u8, int); 80 81 void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *); 82 83 sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size); 84 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd); 85 sense_reason_t spc_emulate_inquiry_std(struct se_cmd *, unsigned char *); 86 sense_reason_t spc_emulate_evpd_83(struct se_cmd *, unsigned char *); 87 88 sense_reason_t sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops); 89 u32 sbc_get_device_rev(struct se_device *dev); 90 u32 sbc_get_device_type(struct se_device *dev); 91 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd); 92 void sbc_dif_generate(struct se_cmd *); 93 sense_reason_t sbc_dif_verify(struct se_cmd *, sector_t, unsigned int, 94 unsigned int, struct scatterlist *, int); 95 void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool, 96 struct scatterlist *, int); 97 void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *); 98 int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *); 99 int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *); 100 int transport_set_vpd_ident(struct t10_vpd *, unsigned char *); 101 102 extern struct configfs_attribute *sbc_attrib_attrs[]; 103 extern struct configfs_attribute *passthrough_attrib_attrs[]; 104 extern struct configfs_attribute *passthrough_pr_attrib_attrs[]; 105 106 /* core helpers also used by command snooping in pscsi */ 107 void *transport_kmap_data_sg(struct se_cmd *); 108 void transport_kunmap_data_sg(struct se_cmd *); 109 /* core helpers also used by xcopy during internal command setup */ 110 sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *, 111 struct scatterlist *, u32, struct scatterlist *, u32); 112 113 bool target_lun_is_rdonly(struct se_cmd *); 114 sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd, 115 sense_reason_t (*exec_cmd)(struct se_cmd *cmd)); 116 117 bool target_sense_desc_format(struct se_device *dev); 118 sector_t target_to_linux_sector(struct se_device *dev, sector_t lb); 119 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib, 120 struct request_queue *q); 121 122 static inline bool target_dev_configured(struct se_device *se_dev) 123 { 124 return !!(se_dev->dev_flags & DF_CONFIGURED); 125 } 126 127 #endif /* TARGET_CORE_BACKEND_H */ 128