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1da177e4 LT |
1 | #ifndef _SCSI_SCSI_CMND_H |
2 | #define _SCSI_SCSI_CMND_H | |
3 | ||
4 | #include <linux/dma-mapping.h> | |
5 | #include <linux/list.h> | |
6 | #include <linux/types.h> | |
4e57b681 | 7 | #include <linux/timer.h> |
1da177e4 LT |
8 | |
9 | struct request; | |
10 | struct scatterlist; | |
11 | struct scsi_device; | |
1da177e4 LT |
12 | |
13 | ||
14 | /* embedded in scsi_cmnd */ | |
15 | struct scsi_pointer { | |
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 */ | |
20 | ||
21 | dma_addr_t dma_handle; | |
22 | ||
23 | volatile int Status; | |
24 | volatile int Message; | |
25 | volatile int have_data_in; | |
26 | volatile int sent_command; | |
27 | volatile int phase; | |
28 | }; | |
29 | ||
30 | struct scsi_cmnd { | |
1da177e4 | 31 | struct scsi_device *device; |
1da177e4 | 32 | struct list_head list; /* scsi_cmnd participates in queue lists */ |
1da177e4 | 33 | struct list_head eh_entry; /* entry for the host eh_cmd_q */ |
1da177e4 LT |
34 | int eh_eflags; /* Used by error handlr */ |
35 | void (*done) (struct scsi_cmnd *); /* Mid-level done function */ | |
36 | ||
37 | /* | |
c6295cdf TH |
38 | * A SCSI Command is assigned a nonzero serial_number before passed |
39 | * to the driver's queue command function. The serial_number is | |
40 | * cleared when scsi_done is entered indicating that the command | |
41 | * has been completed. It currently doesn't have much use other | |
42 | * than printk's. Some lldd's use this number for other purposes. | |
43 | * It's almost certain that such usages are either incorrect or | |
44 | * meaningless. Please kill all usages other than printk's. Also, | |
45 | * as this number is always identical to ->pid, please convert | |
46 | * printk's to use ->pid, so that we can kill this field. | |
1da177e4 LT |
47 | */ |
48 | unsigned long serial_number; | |
b21a4138 JB |
49 | /* |
50 | * This is set to jiffies as it was when the command was first | |
51 | * allocated. It is used to time how long the command has | |
52 | * been outstanding | |
53 | */ | |
54 | unsigned long jiffies_at_alloc; | |
1da177e4 LT |
55 | |
56 | int retries; | |
57 | int allowed; | |
58 | int timeout_per_command; | |
1da177e4 | 59 | |
1da177e4 | 60 | unsigned char cmd_len; |
1da177e4 | 61 | enum dma_data_direction sc_data_direction; |
1da177e4 LT |
62 | |
63 | /* These elements define the operation we are about to perform */ | |
64 | #define MAX_COMMAND_SIZE 16 | |
65 | unsigned char cmnd[MAX_COMMAND_SIZE]; | |
66 | unsigned request_bufflen; /* Actual request size */ | |
67 | ||
68 | struct timer_list eh_timeout; /* Used to time out the command. */ | |
69 | void *request_buffer; /* Actual requested buffer */ | |
70 | ||
71 | /* These elements define the operation we ultimately want to perform */ | |
1da177e4 LT |
72 | unsigned short use_sg; /* Number of pieces of scatter-gather */ |
73 | unsigned short sglist_len; /* size of malloc'd scatter-gather list */ | |
1da177e4 LT |
74 | |
75 | unsigned underflow; /* Return error if less than | |
76 | this amount is transferred */ | |
1da177e4 LT |
77 | |
78 | unsigned transfersize; /* How much we are guaranteed to | |
79 | transfer with each SCSI transfer | |
80 | (ie, between disconnect / | |
81 | reconnects. Probably == sector | |
82 | size */ | |
83 | ||
84 | int resid; /* Number of bytes requested to be | |
85 | transferred less actual number | |
86 | transferred (0 if not supported) */ | |
87 | ||
88 | struct request *request; /* The command we are | |
89 | working on */ | |
90 | ||
91 | #define SCSI_SENSE_BUFFERSIZE 96 | |
c67a848c MW |
92 | unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; |
93 | /* obtained by REQUEST SENSE when | |
94 | * CHECK CONDITION is received on original | |
95 | * command (auto-sense) */ | |
1da177e4 LT |
96 | |
97 | /* Low-level done function - can be used by low-level driver to point | |
98 | * to completion function. Not used by mid/upper level code. */ | |
99 | void (*scsi_done) (struct scsi_cmnd *); | |
100 | ||
101 | /* | |
102 | * The following fields can be written to by the host specific code. | |
103 | * Everything else should be left alone. | |
104 | */ | |
105 | struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ | |
106 | ||
107 | unsigned char *host_scribble; /* The host adapter is allowed to | |
c67a848c MW |
108 | * call scsi_malloc and get some memory |
109 | * and hang it here. The host adapter | |
110 | * is also expected to call scsi_free | |
111 | * to release this memory. (The memory | |
112 | * obtained by scsi_malloc is guaranteed | |
113 | * to be at an address < 16Mb). */ | |
1da177e4 LT |
114 | |
115 | int result; /* Status code from lower level driver */ | |
116 | ||
117 | unsigned char tag; /* SCSI-II queued command tag */ | |
118 | unsigned long pid; /* Process ID, starts at 0. Unique per host. */ | |
119 | }; | |
120 | ||
c53033f6 | 121 | extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); |
1da177e4 | 122 | extern void scsi_put_command(struct scsi_cmnd *); |
03aba2f7 | 123 | extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); |
1da177e4 | 124 | extern void scsi_finish_command(struct scsi_cmnd *cmd); |
89f48c4d | 125 | extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); |
1da177e4 | 126 | |
cdb8c2a6 GL |
127 | extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, |
128 | size_t *offset, size_t *len); | |
129 | extern void scsi_kunmap_atomic_sg(void *virt); | |
130 | ||
1da177e4 | 131 | #endif /* _SCSI_SCSI_CMND_H */ |