blob: 7529f4388bb46df6655e61364217c78e2199ea18 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
#ifndef _SCSI_SCSI_CMND_H
#define _SCSI_SCSI_CMND_H
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/timer.h>
struct request;
struct scatterlist;
struct scsi_device;
struct scsi_request;
/* embedded in scsi_cmnd */
struct scsi_pointer {
char *ptr; /* data pointer */
int this_residual; /* left in this buffer */
struct scatterlist *buffer; /* which buffer */
int buffers_residual; /* how many buffers left */
dma_addr_t dma_handle;
volatile int Status;
volatile int Message;
volatile int have_data_in;
volatile int sent_command;
volatile int phase;
};
struct scsi_cmnd {
int sc_magic;
struct scsi_device *device;
struct scsi_request *sc_request;
struct list_head list; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */
int eh_eflags; /* Used by error handlr */
void (*done) (struct scsi_cmnd *); /* Mid-level done function */
/*
* A SCSI Command is assigned a nonzero serial_number before passed
* to the driver's queue command function. The serial_number is
* cleared when scsi_done is entered indicating that the command
* has been completed. It currently doesn't have much use other
* than printk's. Some lldd's use this number for other purposes.
* It's almost certain that such usages are either incorrect or
* meaningless. Please kill all usages other than printk's. Also,
* as this number is always identical to ->pid, please convert
* printk's to use ->pid, so that we can kill this field.
*/
unsigned long serial_number;
/*
* This is set to jiffies as it was when the command was first
* allocated. It is used to time how long the command has
* been outstanding
*/
unsigned long jiffies_at_alloc;
int retries;
int allowed;
int timeout_per_command;
unsigned char cmd_len;
unsigned char old_cmd_len;
enum dma_data_direction sc_data_direction;
enum dma_data_direction sc_old_data_direction;
/* These elements define the operation we are about to perform */
#define MAX_COMMAND_SIZE 16
unsigned char cmnd[MAX_COMMAND_SIZE];
unsigned request_bufflen; /* Actual request size */
struct timer_list eh_timeout; /* Used to time out the command. */
void *request_buffer; /* Actual requested buffer */
/* These elements define the operation we ultimately want to perform */
unsigned char data_cmnd[MAX_COMMAND_SIZE];
unsigned short old_use_sg; /* We save use_sg here when requesting
* sense info */
unsigned short use_sg; /* Number of pieces of scatter-gather */
unsigned short sglist_len; /* size of malloc'd scatter-gather list */
unsigned bufflen; /* Size of data buffer */
void *buffer; /* Data buffer */
unsigned underflow; /* Return error if less than
this amount is transferred */
unsigned old_underflow; /* save underflow here when reusing the
* command for error handling */
unsigned transfersize; /* How much we are guaranteed to
transfer with each SCSI transfer
(ie, between disconnect /
reconnects. Probably == sector
size */
int resid; /* Number of bytes requested to be
transferred less actual number
transferred (0 if not supported) */
struct request *request; /* The command we are
working on */
#define SCSI_SENSE_BUFFERSIZE 96
unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; /* obtained by REQUEST SENSE
* when CHECK CONDITION is
* received on original command
* (auto-sense) */
/* Low-level done function - can be used by low-level driver to point
* to completion function. Not used by mid/upper level code. */
void (*scsi_done) (struct scsi_cmnd *);
/*
* The following fields can be written to by the host specific code.
* Everything else should be left alone.
*/
struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
unsigned char *host_scribble; /* The host adapter is allowed to
* call scsi_malloc and get some memory
* and hang it here. The host adapter
* is also expected to call scsi_free
* to release this memory. (The memory
* obtained by scsi_malloc is guaranteed
* to be at an address < 16Mb). */
int result; /* Status code from lower level driver */
unsigned char tag; /* SCSI-II queued command tag */
unsigned long pid; /* Process ID, starts at 0. Unique per host. */
};
/*
* These are the values that scsi_cmd->state can take.
*/
#define SCSI_STATE_TIMEOUT 0x1000
#define SCSI_STATE_FINISHED 0x1001
#define SCSI_STATE_FAILED 0x1002
#define SCSI_STATE_QUEUED 0x1003
#define SCSI_STATE_UNUSED 0x1006
#define SCSI_STATE_DISCONNECTING 0x1008
#define SCSI_STATE_INITIALIZING 0x1009
#define SCSI_STATE_BHQUEUE 0x100a
#define SCSI_STATE_MLQUEUE 0x100b
extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
extern void scsi_put_command(struct scsi_cmnd *);
extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
#endif /* _SCSI_SCSI_CMND_H */
|
