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