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_Host; 12 struct scsi_device; 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 struct scsi_device *device; 33 struct list_head list; /* scsi_cmnd participates in queue lists */ 34 struct list_head eh_entry; /* entry for the host eh_cmd_q */ 35 int eh_eflags; /* Used by error handlr */ 36 void (*done) (struct scsi_cmnd *); /* Mid-level done function */ 37 38 /* 39 * A SCSI Command is assigned a nonzero serial_number before passed 40 * to the driver's queue command function. The serial_number is 41 * cleared when scsi_done is entered indicating that the command 42 * has been completed. It currently doesn't have much use other 43 * than printk's. Some lldd's use this number for other purposes. 44 * It's almost certain that such usages are either incorrect or 45 * meaningless. Please kill all usages other than printk's. Also, 46 * as this number is always identical to ->pid, please convert 47 * printk's to use ->pid, so that we can kill this field. 48 */ 49 unsigned long serial_number; 50 /* 51 * This is set to jiffies as it was when the command was first 52 * allocated. It is used to time how long the command has 53 * been outstanding 54 */ 55 unsigned long jiffies_at_alloc; 56 57 int retries; 58 int allowed; 59 int timeout_per_command; 60 61 unsigned char cmd_len; 62 enum dma_data_direction sc_data_direction; 63 64 /* These elements define the operation we are about to perform */ 65 #define MAX_COMMAND_SIZE 16 66 unsigned char cmnd[MAX_COMMAND_SIZE]; 67 unsigned request_bufflen; /* Actual request size */ 68 69 struct timer_list eh_timeout; /* Used to time out the command. */ 70 void *request_buffer; /* Actual requested buffer */ 71 72 /* These elements define the operation we ultimately want to perform */ 73 unsigned short use_sg; /* Number of pieces of scatter-gather */ 74 unsigned short sglist_len; /* size of malloc'd scatter-gather list */ 75 76 /* offset in cmd we are at (for multi-transfer tgt cmds) */ 77 unsigned offset; 78 79 unsigned underflow; /* Return error if less than 80 this amount is transferred */ 81 82 unsigned transfersize; /* How much we are guaranteed to 83 transfer with each SCSI transfer 84 (ie, between disconnect / 85 reconnects. Probably == sector 86 size */ 87 88 int resid; /* Number of bytes requested to be 89 transferred less actual number 90 transferred (0 if not supported) */ 91 92 struct request *request; /* The command we are 93 working on */ 94 95 #define SCSI_SENSE_BUFFERSIZE 96 96 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; 97 /* obtained by REQUEST SENSE when 98 * CHECK CONDITION is received on original 99 * command (auto-sense) */ 100 101 /* Low-level done function - can be used by low-level driver to point 102 * to completion function. Not used by mid/upper level code. */ 103 void (*scsi_done) (struct scsi_cmnd *); 104 105 /* 106 * The following fields can be written to by the host specific code. 107 * Everything else should be left alone. 108 */ 109 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 110 111 unsigned char *host_scribble; /* The host adapter is allowed to 112 * call scsi_malloc and get some memory 113 * and hang it here. The host adapter 114 * is also expected to call scsi_free 115 * to release this memory. (The memory 116 * obtained by scsi_malloc is guaranteed 117 * to be at an address < 16Mb). */ 118 119 int result; /* Status code from lower level driver */ 120 121 unsigned char tag; /* SCSI-II queued command tag */ 122 unsigned long pid; /* Process ID, starts at 0. Unique per host. */ 123 }; 124 125 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); 126 extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); 127 extern void scsi_put_command(struct scsi_cmnd *); 128 extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, 129 struct device *); 130 extern void scsi_io_completion(struct scsi_cmnd *, unsigned int); 131 extern void scsi_finish_command(struct scsi_cmnd *cmd); 132 extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); 133 134 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 135 size_t *offset, size_t *len); 136 extern void scsi_kunmap_atomic_sg(void *virt); 137 138 extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t); 139 extern void scsi_free_sgtable(struct scatterlist *, int); 140 141 #endif /* _SCSI_SCSI_CMND_H */ 142