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 #include <linux/timer.h> 8 9 struct request; 10 struct scatterlist; 11 struct scsi_device; 12 struct scsi_request; 13 14 15 /* embedded in scsi_cmnd */ 16 struct scsi_pointer { 17 char *ptr; /* data pointer */ 18 int this_residual; /* left in this buffer */ 19 struct scatterlist *buffer; /* which buffer */ 20 int buffers_residual; /* how many buffers left */ 21 22 dma_addr_t dma_handle; 23 24 volatile int Status; 25 volatile int Message; 26 volatile int have_data_in; 27 volatile int sent_command; 28 volatile int phase; 29 }; 30 31 struct scsi_cmnd { 32 int sc_magic; 33 34 struct scsi_device *device; 35 struct scsi_request *sc_request; 36 37 struct list_head list; /* scsi_cmnd participates in queue lists */ 38 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 */ 42 43 /* 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. 53 */ 54 unsigned long serial_number; 55 /* 56 * This is set to jiffies as it was when the command was first 57 * allocated. It is used to time how long the command has 58 * been outstanding 59 */ 60 unsigned long jiffies_at_alloc; 61 62 int retries; 63 int allowed; 64 int timeout_per_command; 65 66 unsigned char cmd_len; 67 unsigned char old_cmd_len; 68 enum dma_data_direction sc_data_direction; 69 enum dma_data_direction sc_old_data_direction; 70 71 /* These elements define the operation we are about to perform */ 72 #define MAX_COMMAND_SIZE 16 73 unsigned char cmnd[MAX_COMMAND_SIZE]; 74 unsigned request_bufflen; /* Actual request size */ 75 76 struct timer_list eh_timeout; /* Used to time out the command. */ 77 void *request_buffer; /* Actual requested buffer */ 78 79 /* These elements define the operation we ultimately want to perform */ 80 unsigned char data_cmnd[MAX_COMMAND_SIZE]; 81 unsigned short old_use_sg; /* We save use_sg here when requesting 82 * sense info */ 83 unsigned short use_sg; /* Number of pieces of scatter-gather */ 84 unsigned short sglist_len; /* size of malloc'd scatter-gather list */ 85 unsigned bufflen; /* Size of data buffer */ 86 void *buffer; /* Data buffer */ 87 88 unsigned underflow; /* Return error if less than 89 this amount is transferred */ 90 unsigned old_underflow; /* save underflow here when reusing the 91 * command for error handling */ 92 93 unsigned transfersize; /* How much we are guaranteed to 94 transfer with each SCSI transfer 95 (ie, between disconnect / 96 reconnects. Probably == sector 97 size */ 98 99 int resid; /* Number of bytes requested to be 100 transferred less actual number 101 transferred (0 if not supported) */ 102 103 struct request *request; /* The command we are 104 working on */ 105 106 #define SCSI_SENSE_BUFFERSIZE 96 107 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; /* obtained by REQUEST SENSE 108 * when CHECK CONDITION is 109 * received on original command 110 * (auto-sense) */ 111 112 /* Low-level done function - can be used by low-level driver to point 113 * to completion function. Not used by mid/upper level code. */ 114 void (*scsi_done) (struct scsi_cmnd *); 115 116 /* 117 * The following fields can be written to by the host specific code. 118 * Everything else should be left alone. 119 */ 120 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 121 122 unsigned char *host_scribble; /* The host adapter is allowed to 123 * call scsi_malloc and get some memory 124 * and hang it here. The host adapter 125 * is also expected to call scsi_free 126 * to release this memory. (The memory 127 * obtained by scsi_malloc is guaranteed 128 * to be at an address < 16Mb). */ 129 130 int result; /* Status code from lower level driver */ 131 132 unsigned char tag; /* SCSI-II queued command tag */ 133 unsigned long pid; /* Process ID, starts at 0. Unique per host. */ 134 }; 135 136 /* 137 * These are the values that scsi_cmd->state can take. 138 */ 139 #define SCSI_STATE_TIMEOUT 0x1000 140 #define SCSI_STATE_FINISHED 0x1001 141 #define SCSI_STATE_FAILED 0x1002 142 #define SCSI_STATE_QUEUED 0x1003 143 #define SCSI_STATE_UNUSED 0x1006 144 #define SCSI_STATE_DISCONNECTING 0x1008 145 #define SCSI_STATE_INITIALIZING 0x1009 146 #define SCSI_STATE_BHQUEUE 0x100a 147 #define SCSI_STATE_MLQUEUE 0x100b 148 149 150 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); 151 extern void scsi_put_command(struct scsi_cmnd *); 152 extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int); 153 extern void scsi_finish_command(struct scsi_cmnd *cmd); 154 extern void scsi_setup_blk_pc_cmnd(struct scsi_cmnd *cmd); 155 156 #endif /* _SCSI_SCSI_CMND_H */ 157