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linux/include/target/target_core_transport.h
Nicholas Bellinger f436677262 [SCSI] target: Fix bug with task_sg chained transport_free_dev_tasks release 
This patch addresses a bug in the target core release path for HW
operation where transport_free_dev_tasks() was incorrectly being called
from transport_lun_remove_cmd() while releasing a se_cmd reference and
calling struct target_core_fabric_ops->queue_data_in().

This would result in a OOPs with HW target mode when the release of
se_task->task_sg[] would happen before pci_unmap_sg() can be called in
HW target mode fabric module code.  This patch addresses the issue by
moving transport_free_dev_tasks() from transport_lun_remove_cmd() into
transport_generic_free_cmd(), and adding TRANSPORT_FREE_CMD_INTR and
transport_generic_free_cmd_intr() to allow se_cmd descriptor release
to happen fromfrom within transport_processing_thread() process context
when release of se_cmd is not possible from HW interrupt context.

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <jbottomley@parallels.com>
2011-05-24 13:00:10 -04:00

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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_TASK_TIMEOUT -10
#define PYX_TRANSPORT_RESERVATION_CONFLICT -11
#define PYX_TRANSPORT_ILLEGAL_REQUEST -12
#define PYX_TRANSPORT_USE_SENSE_REASON -13
#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
/* For SE OBJ Plugins, in seconds */
#define TRANSPORT_TIMEOUT_TUR 10
#define TRANSPORT_TIMEOUT_TYPE_DISK 60
#define TRANSPORT_TIMEOUT_TYPE_ROM 120
#define TRANSPORT_TIMEOUT_TYPE_TAPE 600
#define TRANSPORT_TIMEOUT_TYPE_OTHER 300
/* For se_task->task_state_flags */
#define TSF_EXCEPTION_CLEARED 0x01
/*
* 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 */
/* 10 Minutes */
#define DA_TASK_TIMEOUT_MAX 600
/* 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
#define SE_MODE_PAGE_BUF 512
#define MOD_MAX_SECTORS(ms, bs) (ms % (PAGE_SIZE / bs))
struct se_mem;
struct se_subsystem_api;
extern struct kmem_cache *se_mem_cache;
extern int init_se_global(void);
extern void release_se_global(void);
extern void init_scsi_index_table(void);
extern u32 scsi_get_new_index(scsi_index_t);
extern void transport_init_queue_obj(struct se_queue_obj *);
extern int 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_cmd_finish_abort_tmr(struct se_cmd *);
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 *);
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_device_setup_cmd(struct se_cmd *);
extern void transport_init_se_cmd(struct se_cmd *,
struct target_core_fabric_ops *,
struct se_session *, u32, int, int,
unsigned char *);
extern void transport_free_se_cmd(struct se_cmd *);
extern int transport_generic_allocate_tasks(struct se_cmd *, unsigned char *);
extern int transport_generic_handle_cdb(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 void transport_generic_free_cmd_intr(struct se_cmd *);
extern void __transport_stop_task_timer(struct se_task *, unsigned long *);
extern unsigned char transport_asciihex_to_binaryhex(unsigned char val[2]);
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 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_to_pool(struct se_cmd *);
extern void transport_generic_free_cmd(struct se_cmd *, int, int, int);
extern void transport_generic_wait_for_cmds(struct se_cmd *, int);
extern u32 transport_calc_sg_num(struct se_task *, struct se_mem *, u32);
extern int transport_map_mem_to_sg(struct se_task *, struct list_head *,
void *, struct se_mem *,
struct se_mem **, u32 *, u32 *);
extern void transport_do_task_sg_chain(struct se_cmd *);
extern void transport_generic_process_write(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 *);
/*
* 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;
/*
* struct module for struct se_hba references
*/
struct module *owner;
/*
* Used for global se_subsystem_api list_head
*/
struct list_head sub_api_list;
/*
* For SCF_SCSI_NON_DATA_CDB
*/
int (*cdb_none)(struct se_task *);
/*
* For SCF_SCSI_CONTROL_NONSG_IO_CDB
*/
int (*map_task_non_SG)(struct se_task *);
/*
* For SCF_SCSI_DATA_SG_IO_CDB and SCF_SCSI_CONTROL_SG_IO_CDB
*/
int (*map_task_SG)(struct se_task *);
/*
* 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 *);
/*
* dpo_emulated():
*/
int (*dpo_emulated)(struct se_device *);
/*
* fua_write_emulated():
*/
int (*fua_write_emulated)(struct se_device *);
/*
* fua_read_emulated():
*/
int (*fua_read_emulated)(struct se_device *);
/*
* write_cache_emulated():
*/
int (*write_cache_emulated)(struct se_device *);
/*
* 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)(struct se_cmd *);
/*
* 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_cdb():
*/
unsigned char *(*get_cdb)(struct se_task *);
/*
* 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 *);
/*
* do_se_mem_map():
*/
int (*do_se_mem_map)(struct se_task *, struct list_head *, void *,
struct se_mem *, struct se_mem **, u32 *, u32 *);
/*
* get_sense_buffer():
*/
unsigned char *(*get_sense_buffer)(struct se_task *);
} ____cacheline_aligned;
#define TRANSPORT(dev) ((dev)->transport)
#define HBA_TRANSPORT(hba) ((hba)->transport)
extern struct se_global *se_global;
#endif /* TARGET_CORE_TRANSPORT_H */
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