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linux/include/target/target_core_transport.h
Nicholas Bellinger a17f091d1a target: Add generic active I/O shutdown logic 
This patch adds the initial pieces of generic active I/O shutdown logic.
This is intended to be a 'opt-in' feature for fabric modules that
includes the following functions to provide a mechinism for fabric
modules to track se_cmd via se_session->sess_cmd_list:

*) target_get_sess_cmd() - Add se_cmd to sess->sess_cmd_list, called
   from fabric module incoming I/O path.
*) target_put_sess_cmd() - Check for completion or drop se_cmd from
   ->sess_cmd_list
*) target_splice_sess_cmd_list() - Splice active I/O list from
   ->sess_cmd_list to ->sess_wait_list, can called with HW fabric
   lock held.
*) target_wait_for_sess_cmds() - Walk ->sess_wait_list waiting on
   individual ->cmd_wait_comp.  Optional transport_wait_for_tasks()
   call.

target_splice_sess_cmd_list() is allowed to be called under HW fabric
lock, and performs the splice into se_sess->sess_wait_list and set
se_cmd->cmd_wait_set.  Then target_wait_for_sess_cmds() walks the list
waiting for individual target_put_sess_cmd() fabric callbacks to
complete.

It also adds TFO->check_release_cmd() to split the completion and memory
release calls, where a fabric module uses target_put_sess_cmd() to check
for I/O completion during session shutdown.  This is currently pushed out
into fabric modules as current fabric code may sleep here waiting for
TFO->check_stop_free() to complete in main response path, and because
target_wait_for_sess_cmds() calling TFO->release_cmd() to free fabric
descriptor memory directly.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
2011-11-04 07:50:26 +00:00

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#ifndef TARGET_CORE_TRANSPORT_H
#define TARGET_CORE_TRANSPORT_H
#define TARGET_CORE_VERSION TARGET_CORE_MOD_VERSION
/* Attempts before moving from SHORT to LONG */
#define PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD 3
#define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT 3 /* In milliseconds */
#define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG 10 /* In milliseconds */
#define PYX_TRANSPORT_STATUS_INTERVAL 5 /* In seconds */
#define PYX_TRANSPORT_SENT_TO_TRANSPORT 0
#define PYX_TRANSPORT_WRITE_PENDING 1
#define PYX_TRANSPORT_UNKNOWN_SAM_OPCODE -1
#define PYX_TRANSPORT_HBA_QUEUE_FULL -2
#define PYX_TRANSPORT_REQ_TOO_MANY_SECTORS -3
#define PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES -4
#define PYX_TRANSPORT_INVALID_CDB_FIELD -5
#define PYX_TRANSPORT_INVALID_PARAMETER_LIST -6
#define PYX_TRANSPORT_LU_COMM_FAILURE -7
#define PYX_TRANSPORT_UNKNOWN_MODE_PAGE -8
#define PYX_TRANSPORT_WRITE_PROTECTED -9
#define PYX_TRANSPORT_RESERVATION_CONFLICT -10
#define PYX_TRANSPORT_ILLEGAL_REQUEST -11
#define PYX_TRANSPORT_USE_SENSE_REASON -12
#ifndef SAM_STAT_RESERVATION_CONFLICT
#define SAM_STAT_RESERVATION_CONFLICT 0x18
#endif
#define TRANSPORT_PLUGIN_FREE 0
#define TRANSPORT_PLUGIN_REGISTERED 1
#define TRANSPORT_PLUGIN_PHBA_PDEV 1
#define TRANSPORT_PLUGIN_VHBA_PDEV 2
#define TRANSPORT_PLUGIN_VHBA_VDEV 3
/*
* struct se_subsystem_dev->su_dev_flags
*/
#define SDF_FIRMWARE_VPD_UNIT_SERIAL 0x00000001
#define SDF_EMULATED_VPD_UNIT_SERIAL 0x00000002
#define SDF_USING_UDEV_PATH 0x00000004
#define SDF_USING_ALIAS 0x00000008
/*
* struct se_device->dev_flags
*/
#define DF_READ_ONLY 0x00000001
#define DF_SPC2_RESERVATIONS 0x00000002
#define DF_SPC2_RESERVATIONS_WITH_ISID 0x00000004
/* struct se_dev_attrib sanity values */
/* Default max_unmap_lba_count */
#define DA_MAX_UNMAP_LBA_COUNT 0
/* Default max_unmap_block_desc_count */
#define DA_MAX_UNMAP_BLOCK_DESC_COUNT 0
/* Default unmap_granularity */
#define DA_UNMAP_GRANULARITY_DEFAULT 0
/* Default unmap_granularity_alignment */
#define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT 0
/* Emulation for Direct Page Out */
#define DA_EMULATE_DPO 0
/* Emulation for Forced Unit Access WRITEs */
#define DA_EMULATE_FUA_WRITE 1
/* Emulation for Forced Unit Access READs */
#define DA_EMULATE_FUA_READ 0
/* Emulation for WriteCache and SYNCHRONIZE_CACHE */
#define DA_EMULATE_WRITE_CACHE 0
/* Emulation for UNIT ATTENTION Interlock Control */
#define DA_EMULATE_UA_INTLLCK_CTRL 0
/* Emulation for TASK_ABORTED status (TAS) by default */
#define DA_EMULATE_TAS 1
/* Emulation for Thin Provisioning UNMAP using block/blk-lib.c:blkdev_issue_discard() */
#define DA_EMULATE_TPU 0
/*
* Emulation for Thin Provisioning WRITE_SAME w/ UNMAP=1 bit using
* block/blk-lib.c:blkdev_issue_discard()
*/
#define DA_EMULATE_TPWS 0
/* No Emulation for PSCSI by default */
#define DA_EMULATE_RESERVATIONS 0
/* No Emulation for PSCSI by default */
#define DA_EMULATE_ALUA 0
/* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
#define DA_ENFORCE_PR_ISIDS 1
#define DA_STATUS_MAX_SECTORS_MIN 16
#define DA_STATUS_MAX_SECTORS_MAX 8192
/* By default don't report non-rotating (solid state) medium */
#define DA_IS_NONROT 0
/* Queue Algorithm Modifier default for restricted reordering in control mode page */
#define DA_EMULATE_REST_REORD 0
#define SE_MODE_PAGE_BUF 512
#define MOD_MAX_SECTORS(ms, bs) (ms % (PAGE_SIZE / bs))
struct se_subsystem_api;
extern int init_se_kmem_caches(void);
extern void release_se_kmem_caches(void);
extern u32 scsi_get_new_index(scsi_index_t);
extern void transport_init_queue_obj(struct se_queue_obj *);
extern void transport_subsystem_check_init(void);
extern int transport_subsystem_register(struct se_subsystem_api *);
extern void transport_subsystem_release(struct se_subsystem_api *);
extern void transport_load_plugins(void);
extern struct se_session *transport_init_session(void);
extern void __transport_register_session(struct se_portal_group *,
struct se_node_acl *,
struct se_session *, void *);
extern void transport_register_session(struct se_portal_group *,
struct se_node_acl *,
struct se_session *, void *);
extern void transport_free_session(struct se_session *);
extern void transport_deregister_session_configfs(struct se_session *);
extern void transport_deregister_session(struct se_session *);
extern void transport_cmd_finish_abort(struct se_cmd *, int);
extern void transport_complete_sync_cache(struct se_cmd *, int);
extern void transport_complete_task(struct se_task *, int);
extern void transport_add_task_to_execute_queue(struct se_task *,
struct se_task *,
struct se_device *);
extern void transport_remove_task_from_execute_queue(struct se_task *,
struct se_device *);
extern void __transport_remove_task_from_execute_queue(struct se_task *,
struct se_device *);
unsigned char *transport_dump_cmd_direction(struct se_cmd *);
extern void transport_dump_dev_state(struct se_device *, char *, int *);
extern void transport_dump_dev_info(struct se_device *, struct se_lun *,
unsigned long long, char *, int *);
extern void transport_dump_vpd_proto_id(struct t10_vpd *,
unsigned char *, int);
extern void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
extern int transport_dump_vpd_assoc(struct t10_vpd *,
unsigned char *, int);
extern int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
extern int transport_dump_vpd_ident_type(struct t10_vpd *,
unsigned char *, int);
extern int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
extern int transport_dump_vpd_ident(struct t10_vpd *,
unsigned char *, int);
extern int transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
extern struct se_device *transport_add_device_to_core_hba(struct se_hba *,
struct se_subsystem_api *,
struct se_subsystem_dev *, u32,
void *, struct se_dev_limits *,
const char *, const char *);
extern void transport_init_se_cmd(struct se_cmd *,
struct target_core_fabric_ops *,
struct se_session *, u32, int, int,
unsigned char *);
void *transport_kmap_first_data_page(struct se_cmd *cmd);
void transport_kunmap_first_data_page(struct se_cmd *cmd);
extern int transport_generic_allocate_tasks(struct se_cmd *, unsigned char *);
extern int transport_handle_cdb_direct(struct se_cmd *);
extern int transport_generic_handle_cdb_map(struct se_cmd *);
extern int transport_generic_handle_data(struct se_cmd *);
extern void transport_new_cmd_failure(struct se_cmd *);
extern int transport_generic_handle_tmr(struct se_cmd *);
extern bool target_stop_task(struct se_task *task, unsigned long *flags);
extern int transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *, u32,
struct scatterlist *, u32);
extern int transport_clear_lun_from_sessions(struct se_lun *);
extern bool transport_wait_for_tasks(struct se_cmd *);
extern int transport_check_aborted_status(struct se_cmd *, int);
extern int transport_send_check_condition_and_sense(struct se_cmd *, u8, int);
extern void transport_send_task_abort(struct se_cmd *);
extern void transport_release_cmd(struct se_cmd *);
extern void transport_generic_free_cmd(struct se_cmd *, int);
extern void target_get_sess_cmd(struct se_session *, struct se_cmd *);
extern int target_put_sess_cmd(struct se_session *, struct se_cmd *);
extern void target_splice_sess_cmd_list(struct se_session *);
extern void target_wait_for_sess_cmds(struct se_session *, int);
extern void transport_generic_wait_for_cmds(struct se_cmd *, int);
extern void transport_do_task_sg_chain(struct se_cmd *);
extern void transport_generic_process_write(struct se_cmd *);
extern int transport_generic_new_cmd(struct se_cmd *);
extern int transport_generic_do_tmr(struct se_cmd *);
/* From target_core_alua.c */
extern int core_alua_check_nonop_delay(struct se_cmd *);
/* From target_core_cdb.c */
extern int transport_emulate_control_cdb(struct se_task *);
extern void target_get_task_cdb(struct se_task *task, unsigned char *cdb);
/*
* Each se_transport_task_t can have N number of possible struct se_task's
* for the storage transport(s) to possibly execute.
* Used primarily for splitting up CDBs that exceed the physical storage
* HBA's maximum sector count per task.
*/
struct se_mem {
struct page *se_page;
u32 se_len;
u32 se_off;
struct list_head se_list;
} ____cacheline_aligned;
/*
* Each type of disk transport supported MUST have a template defined
* within its .h file.
*/
struct se_subsystem_api {
/*
* The Name. :-)
*/
char name[16];
/*
* Transport Type.
*/
u8 transport_type;
unsigned int fua_write_emulated : 1;
unsigned int write_cache_emulated : 1;
/*
* struct module for struct se_hba references
*/
struct module *owner;
/*
* Used for global se_subsystem_api list_head
*/
struct list_head sub_api_list;
/*
* attach_hba():
*/
int (*attach_hba)(struct se_hba *, u32);
/*
* detach_hba():
*/
void (*detach_hba)(struct se_hba *);
/*
* pmode_hba(): Used for TCM/pSCSI subsystem plugin HBA ->
* Linux/SCSI struct Scsi_Host passthrough
*/
int (*pmode_enable_hba)(struct se_hba *, unsigned long);
/*
* allocate_virtdevice():
*/
void *(*allocate_virtdevice)(struct se_hba *, const char *);
/*
* create_virtdevice(): Only for Virtual HBAs
*/
struct se_device *(*create_virtdevice)(struct se_hba *,
struct se_subsystem_dev *, void *);
/*
* free_device():
*/
void (*free_device)(void *);
/*
* transport_complete():
*
* Use transport_generic_complete() for majority of DAS transport
* drivers. Provided out of convenience.
*/
int (*transport_complete)(struct se_task *task);
struct se_task *(*alloc_task)(unsigned char *cdb);
/*
* do_task():
*/
int (*do_task)(struct se_task *);
/*
* Used by virtual subsystem plugins IBLOCK and FILEIO to emulate
* UNMAP and WRITE_SAME_* w/ UNMAP=1 <-> Linux/Block Discard
*/
int (*do_discard)(struct se_device *, sector_t, u32);
/*
* Used by virtual subsystem plugins IBLOCK and FILEIO to emulate
* SYNCHRONIZE_CACHE_* <-> Linux/Block blkdev_issue_flush()
*/
void (*do_sync_cache)(struct se_task *);
/*
* free_task():
*/
void (*free_task)(struct se_task *);
/*
* check_configfs_dev_params():
*/
ssize_t (*check_configfs_dev_params)(struct se_hba *, struct se_subsystem_dev *);
/*
* set_configfs_dev_params():
*/
ssize_t (*set_configfs_dev_params)(struct se_hba *, struct se_subsystem_dev *,
const char *, ssize_t);
/*
* show_configfs_dev_params():
*/
ssize_t (*show_configfs_dev_params)(struct se_hba *, struct se_subsystem_dev *,
char *);
/*
* get_device_rev():
*/
u32 (*get_device_rev)(struct se_device *);
/*
* get_device_type():
*/
u32 (*get_device_type)(struct se_device *);
/*
* Get the sector_t from a subsystem backstore..
*/
sector_t (*get_blocks)(struct se_device *);
/*
* get_sense_buffer():
*/
unsigned char *(*get_sense_buffer)(struct se_task *);
} ____cacheline_aligned;
#endif /* TARGET_CORE_TRANSPORT_H */
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