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 * This is set to jiffies as it was when the command was first 56 * allocated. It is used to time how long the command has 57 * been outstanding 58 */ 59 unsigned long jiffies_at_alloc; 60 61 int retries; 62 int allowed; 63 int timeout_per_command; 64 65 unsigned char cmd_len; 66 unsigned char old_cmd_len; 67 enum dma_data_direction sc_data_direction; 68 enum dma_data_direction sc_old_data_direction; 69 70 /* These elements define the operation we are about to perform */ 71 #define MAX_COMMAND_SIZE 16 72 unsigned char cmnd[MAX_COMMAND_SIZE]; 73 unsigned request_bufflen; /* Actual request size */ 74 75 struct timer_list eh_timeout; /* Used to time out the command. */ 76 void *request_buffer; /* Actual requested buffer */ 77 78 /* These elements define the operation we ultimately want to perform */ 79 unsigned char data_cmnd[MAX_COMMAND_SIZE]; 80 unsigned short old_use_sg; /* We save use_sg here when requesting 81 * sense info */ 82 unsigned short use_sg; /* Number of pieces of scatter-gather */ 83 unsigned short sglist_len; /* size of malloc'd scatter-gather list */ 84 unsigned bufflen; /* Size of data buffer */ 85 void *buffer; /* Data buffer */ 86 87 unsigned underflow; /* Return error if less than 88 this amount is transferred */ 89 unsigned old_underflow; /* save underflow here when reusing the 90 * command for error handling */ 91 92 unsigned transfersize; /* How much we are guaranteed to 93 transfer with each SCSI transfer 94 (ie, between disconnect / 95 reconnects. Probably == sector 96 size */ 97 98 int resid; /* Number of bytes requested to be 99 transferred less actual number 100 transferred (0 if not supported) */ 101 102 struct request *request; /* The command we are 103 working on */ 104 105 #define SCSI_SENSE_BUFFERSIZE 96 106 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; /* obtained by REQUEST SENSE 107 * when CHECK CONDITION is 108 * received on original command 109 * (auto-sense) */ 110 111 /* Low-level done function - can be used by low-level driver to point 112 * to completion function. Not used by mid/upper level code. */ 113 void (*scsi_done) (struct scsi_cmnd *); 114 115 /* 116 * The following fields can be written to by the host specific code. 117 * Everything else should be left alone. 118 */ 119 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 120 121 unsigned char *host_scribble; /* The host adapter is allowed to 122 * call scsi_malloc and get some memory 123 * and hang it here. The host adapter 124 * is also expected to call scsi_free 125 * to release this memory. (The memory 126 * obtained by scsi_malloc is guaranteed 127 * to be at an address < 16Mb). */ 128 129 int result; /* Status code from lower level driver */ 130 131 unsigned char tag; /* SCSI-II queued command tag */ 132 unsigned long pid; /* Process ID, starts at 0. Unique per host. */ 133 }; 134 135 /* 136 * These are the values that scsi_cmd->state can take. 137 */ 138 #define SCSI_STATE_TIMEOUT 0x1000 139 #define SCSI_STATE_FINISHED 0x1001 140 #define SCSI_STATE_FAILED 0x1002 141 #define SCSI_STATE_QUEUED 0x1003 142 #define SCSI_STATE_UNUSED 0x1006 143 #define SCSI_STATE_DISCONNECTING 0x1008 144 #define SCSI_STATE_INITIALIZING 0x1009 145 #define SCSI_STATE_BHQUEUE 0x100a 146 #define SCSI_STATE_MLQUEUE 0x100b 147 148 149 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, int); 150 extern void scsi_put_command(struct scsi_cmnd *); 151 extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int); 152 extern void scsi_finish_command(struct scsi_cmnd *cmd); 153 154 #endif /* _SCSI_SCSI_CMND_H */ 155