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 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 struct scsi_device *device; 32 struct list_head list; /* scsi_cmnd participates in queue lists */ 33 struct list_head eh_entry; /* entry for the host eh_cmd_q */ 34 int eh_eflags; /* Used by error handlr */ 35 void (*done) (struct scsi_cmnd *); /* Mid-level done function */ 36 37 /* 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. 47 */ 48 unsigned long serial_number; 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; 55 56 int retries; 57 int allowed; 58 int timeout_per_command; 59 60 unsigned char cmd_len; 61 unsigned char old_cmd_len; 62 enum dma_data_direction sc_data_direction; 63 enum dma_data_direction sc_old_data_direction; 64 65 /* These elements define the operation we are about to perform */ 66 #define MAX_COMMAND_SIZE 16 67 unsigned char cmnd[MAX_COMMAND_SIZE]; 68 unsigned request_bufflen; /* Actual request size */ 69 70 struct timer_list eh_timeout; /* Used to time out the command. */ 71 void *request_buffer; /* Actual requested buffer */ 72 73 /* These elements define the operation we ultimately want to perform */ 74 unsigned char data_cmnd[MAX_COMMAND_SIZE]; 75 unsigned short old_use_sg; /* We save use_sg here when requesting 76 * sense info */ 77 unsigned short use_sg; /* Number of pieces of scatter-gather */ 78 unsigned short sglist_len; /* size of malloc'd scatter-gather list */ 79 unsigned bufflen; /* Size of data buffer */ 80 void *buffer; /* Data buffer */ 81 82 unsigned underflow; /* Return error if less than 83 this amount is transferred */ 84 unsigned old_underflow; /* save underflow here when reusing the 85 * command for error handling */ 86 87 unsigned transfersize; /* How much we are guaranteed to 88 transfer with each SCSI transfer 89 (ie, between disconnect / 90 reconnects. Probably == sector 91 size */ 92 93 int resid; /* Number of bytes requested to be 94 transferred less actual number 95 transferred (0 if not supported) */ 96 97 struct request *request; /* The command we are 98 working on */ 99 100 #define SCSI_SENSE_BUFFERSIZE 96 101 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; 102 /* obtained by REQUEST SENSE when 103 * CHECK CONDITION is received on original 104 * command (auto-sense) */ 105 106 /* Low-level done function - can be used by low-level driver to point 107 * to completion function. Not used by mid/upper level code. */ 108 void (*scsi_done) (struct scsi_cmnd *); 109 110 /* 111 * The following fields can be written to by the host specific code. 112 * Everything else should be left alone. 113 */ 114 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 115 116 unsigned char *host_scribble; /* The host adapter is allowed to 117 * call scsi_malloc and get some memory 118 * and hang it here. The host adapter 119 * is also expected to call scsi_free 120 * to release this memory. (The memory 121 * obtained by scsi_malloc is guaranteed 122 * to be at an address < 16Mb). */ 123 124 int result; /* Status code from lower level driver */ 125 126 unsigned char tag; /* SCSI-II queued command tag */ 127 unsigned long pid; /* Process ID, starts at 0. Unique per host. */ 128 }; 129 130 /* 131 * These are the values that scsi_cmd->state can take. 132 */ 133 #define SCSI_STATE_TIMEOUT 0x1000 134 #define SCSI_STATE_FINISHED 0x1001 135 #define SCSI_STATE_FAILED 0x1002 136 #define SCSI_STATE_QUEUED 0x1003 137 #define SCSI_STATE_UNUSED 0x1006 138 #define SCSI_STATE_DISCONNECTING 0x1008 139 #define SCSI_STATE_INITIALIZING 0x1009 140 #define SCSI_STATE_BHQUEUE 0x100a 141 #define SCSI_STATE_MLQUEUE 0x100b 142 143 144 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); 145 extern void scsi_put_command(struct scsi_cmnd *); 146 extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); 147 extern void scsi_finish_command(struct scsi_cmnd *cmd); 148 extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); 149 150 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 151 size_t *offset, size_t *len); 152 extern void scsi_kunmap_atomic_sg(void *virt); 153 154 #endif /* _SCSI_SCSI_CMND_H */ 155