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