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 #include <linux/scatterlist.h> 9 10 struct request; 11 struct scatterlist; 12 struct Scsi_Host; 13 struct scsi_device; 14 15 16 /* embedded in scsi_cmnd */ 17 struct scsi_pointer { 18 char *ptr; /* data pointer */ 19 int this_residual; /* left in this buffer */ 20 struct scatterlist *buffer; /* which buffer */ 21 int buffers_residual; /* how many buffers left */ 22 23 dma_addr_t dma_handle; 24 25 volatile int Status; 26 volatile int Message; 27 volatile int have_data_in; 28 volatile int sent_command; 29 volatile int phase; 30 }; 31 32 struct scsi_cmnd { 33 struct scsi_device *device; 34 struct list_head list; /* scsi_cmnd participates in queue lists */ 35 struct list_head eh_entry; /* entry for the host eh_cmd_q */ 36 int eh_eflags; /* Used by error handlr */ 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 is a bug for LLDDs to use this number 43 * for purposes other than printk (and even that is only useful 44 * for debugging). 45 */ 46 unsigned long serial_number; 47 48 /* 49 * This is set to jiffies as it was when the command was first 50 * allocated. It is used to time how long the command has 51 * been outstanding 52 */ 53 unsigned long jiffies_at_alloc; 54 55 int retries; 56 int allowed; 57 int timeout_per_command; 58 59 unsigned char cmd_len; 60 enum dma_data_direction sc_data_direction; 61 62 /* These elements define the operation we are about to perform */ 63 #define MAX_COMMAND_SIZE 16 64 unsigned char cmnd[MAX_COMMAND_SIZE]; 65 unsigned request_bufflen; /* Actual request size */ 66 67 struct timer_list eh_timeout; /* Used to time out the command. */ 68 void *request_buffer; /* Actual requested buffer */ 69 70 /* These elements define the operation we ultimately want to perform */ 71 unsigned short use_sg; /* Number of pieces of scatter-gather */ 72 unsigned short __use_sg; 73 74 unsigned underflow; /* Return error if less than 75 this amount is transferred */ 76 77 unsigned transfersize; /* How much we are guaranteed to 78 transfer with each SCSI transfer 79 (ie, between disconnect / 80 reconnects. Probably == sector 81 size */ 82 83 int resid; /* Number of bytes requested to be 84 transferred less actual number 85 transferred (0 if not supported) */ 86 87 struct request *request; /* The command we are 88 working on */ 89 90 #define SCSI_SENSE_BUFFERSIZE 96 91 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; 92 /* obtained by REQUEST SENSE when 93 * CHECK CONDITION is received on original 94 * command (auto-sense) */ 95 96 /* Low-level done function - can be used by low-level driver to point 97 * to completion function. Not used by mid/upper level code. */ 98 void (*scsi_done) (struct scsi_cmnd *); 99 100 /* 101 * The following fields can be written to by the host specific code. 102 * Everything else should be left alone. 103 */ 104 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 105 106 unsigned char *host_scribble; /* The host adapter is allowed to 107 * call scsi_malloc and get some memory 108 * and hang it here. The host adapter 109 * is also expected to call scsi_free 110 * to release this memory. (The memory 111 * obtained by scsi_malloc is guaranteed 112 * to be at an address < 16Mb). */ 113 114 int result; /* Status code from lower level driver */ 115 116 unsigned char tag; /* SCSI-II queued command tag */ 117 }; 118 119 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); 120 extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); 121 extern void scsi_put_command(struct scsi_cmnd *); 122 extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, 123 struct device *); 124 extern void scsi_finish_command(struct scsi_cmnd *cmd); 125 extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); 126 127 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 128 size_t *offset, size_t *len); 129 extern void scsi_kunmap_atomic_sg(void *virt); 130 131 extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t); 132 extern void scsi_free_sgtable(struct scsi_cmnd *); 133 134 extern int scsi_dma_map(struct scsi_cmnd *cmd); 135 extern void scsi_dma_unmap(struct scsi_cmnd *cmd); 136 137 #define scsi_sg_count(cmd) ((cmd)->use_sg) 138 #define scsi_sglist(cmd) ((struct scatterlist *)(cmd)->request_buffer) 139 #define scsi_bufflen(cmd) ((cmd)->request_bufflen) 140 141 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) 142 { 143 cmd->resid = resid; 144 } 145 146 static inline int scsi_get_resid(struct scsi_cmnd *cmd) 147 { 148 return cmd->resid; 149 } 150 151 #define scsi_for_each_sg(cmd, sg, nseg, __i) \ 152 for_each_sg(scsi_sglist(cmd), sg, nseg, __i) 153 154 #endif /* _SCSI_SCSI_CMND_H */ 155