1 #ifndef _SCSI_SCSI_CMND_H
2 #define _SCSI_SCSI_CMND_H
4 #include <linux/dma-mapping.h>
5 #include <linux/list.h>
6 #include <linux/types.h>
14 /* embedded in scsi_cmnd */
16 char *ptr
; /* data pointer */
17 int this_residual
; /* left in this buffer */
18 struct scatterlist
*buffer
; /* which buffer */
19 int buffers_residual
; /* how many buffers left */
21 dma_addr_t dma_handle
;
25 volatile int have_data_in
;
26 volatile int sent_command
;
33 struct scsi_device
*device
;
35 struct scsi_request
*sc_request
;
37 struct list_head list
; /* scsi_cmnd participates in queue lists */
39 struct list_head eh_entry
; /* entry for the host eh_cmd_q */
40 int eh_eflags
; /* Used by error handlr */
41 void (*done
) (struct scsi_cmnd
*); /* Mid-level done function */
44 * A SCSI Command is assigned a nonzero serial_number before passed
45 * to the driver's queue command function. The serial_number is
46 * cleared when scsi_done is entered indicating that the command
47 * has been completed. It currently doesn't have much use other
48 * than printk's. Some lldd's use this number for other purposes.
49 * It's almost certain that such usages are either incorrect or
50 * meaningless. Please kill all usages other than printk's. Also,
51 * as this number is always identical to ->pid, please convert
52 * printk's to use ->pid, so that we can kill this field.
54 unsigned long serial_number
;
58 int timeout_per_command
;
62 unsigned char cmd_len
;
63 unsigned char old_cmd_len
;
64 enum dma_data_direction sc_data_direction
;
65 enum dma_data_direction sc_old_data_direction
;
67 /* These elements define the operation we are about to perform */
68 #define MAX_COMMAND_SIZE 16
69 unsigned char cmnd
[MAX_COMMAND_SIZE
];
70 unsigned request_bufflen
; /* Actual request size */
72 struct timer_list eh_timeout
; /* Used to time out the command. */
73 void *request_buffer
; /* Actual requested buffer */
75 /* These elements define the operation we ultimately want to perform */
76 unsigned char data_cmnd
[MAX_COMMAND_SIZE
];
77 unsigned short old_use_sg
; /* We save use_sg here when requesting
79 unsigned short use_sg
; /* Number of pieces of scatter-gather */
80 unsigned short sglist_len
; /* size of malloc'd scatter-gather list */
81 unsigned bufflen
; /* Size of data buffer */
82 void *buffer
; /* Data buffer */
84 unsigned underflow
; /* Return error if less than
85 this amount is transferred */
86 unsigned old_underflow
; /* save underflow here when reusing the
87 * command for error handling */
89 unsigned transfersize
; /* How much we are guaranteed to
90 transfer with each SCSI transfer
91 (ie, between disconnect /
92 reconnects. Probably == sector
95 int resid
; /* Number of bytes requested to be
96 transferred less actual number
97 transferred (0 if not supported) */
99 struct request
*request
; /* The command we are
102 #define SCSI_SENSE_BUFFERSIZE 96
103 unsigned char sense_buffer
[SCSI_SENSE_BUFFERSIZE
]; /* obtained by REQUEST SENSE
104 * when CHECK CONDITION is
105 * received on original command
108 /* Low-level done function - can be used by low-level driver to point
109 * to completion function. Not used by mid/upper level code. */
110 void (*scsi_done
) (struct scsi_cmnd
*);
113 * The following fields can be written to by the host specific code.
114 * Everything else should be left alone.
116 struct scsi_pointer SCp
; /* Scratchpad used by some host adapters */
118 unsigned char *host_scribble
; /* The host adapter is allowed to
119 * call scsi_malloc and get some memory
120 * and hang it here. The host adapter
121 * is also expected to call scsi_free
122 * to release this memory. (The memory
123 * obtained by scsi_malloc is guaranteed
124 * to be at an address < 16Mb). */
126 int result
; /* Status code from lower level driver */
128 unsigned char tag
; /* SCSI-II queued command tag */
129 unsigned long pid
; /* Process ID, starts at 0. Unique per host. */
133 * These are the values that scsi_cmd->state can take.
135 #define SCSI_STATE_TIMEOUT 0x1000
136 #define SCSI_STATE_FINISHED 0x1001
137 #define SCSI_STATE_FAILED 0x1002
138 #define SCSI_STATE_QUEUED 0x1003
139 #define SCSI_STATE_UNUSED 0x1006
140 #define SCSI_STATE_DISCONNECTING 0x1008
141 #define SCSI_STATE_INITIALIZING 0x1009
142 #define SCSI_STATE_BHQUEUE 0x100a
143 #define SCSI_STATE_MLQUEUE 0x100b
146 extern struct scsi_cmnd
*scsi_get_command(struct scsi_device
*, int);
147 extern void scsi_put_command(struct scsi_cmnd
*);
148 extern void scsi_io_completion(struct scsi_cmnd
*, unsigned int, unsigned int);
149 extern void scsi_finish_command(struct scsi_cmnd
*cmd
);
151 #endif /* _SCSI_SCSI_CMND_H */