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 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 is a bug for LLDDs to use this number 42 * for purposes other than printk (and even that is only useful 43 * for debugging). 44 */ 45 unsigned long serial_number; 46 47 /* 48 * This is set to jiffies as it was when the command was first 49 * allocated. It is used to time how long the command has 50 * been outstanding 51 */ 52 unsigned long jiffies_at_alloc; 53 54 int retries; 55 int allowed; 56 int timeout_per_command; 57 58 unsigned char cmd_len; 59 enum dma_data_direction sc_data_direction; 60 61 /* These elements define the operation we are about to perform */ 62 #define MAX_COMMAND_SIZE 16 63 unsigned char cmnd[MAX_COMMAND_SIZE]; 64 unsigned request_bufflen; /* Actual request size */ 65 66 struct timer_list eh_timeout; /* Used to time out the command. */ 67 void *request_buffer; /* Actual requested buffer */ 68 69 /* These elements define the operation we ultimately want to perform */ 70 unsigned short use_sg; /* Number of pieces of scatter-gather */ 71 unsigned short sglist_len; /* size of malloc'd scatter-gather list */ 72 73 unsigned underflow; /* Return error if less than 74 this amount is transferred */ 75 76 unsigned transfersize; /* How much we are guaranteed to 77 transfer with each SCSI transfer 78 (ie, between disconnect / 79 reconnects. Probably == sector 80 size */ 81 82 int resid; /* Number of bytes requested to be 83 transferred less actual number 84 transferred (0 if not supported) */ 85 86 struct request *request; /* The command we are 87 working on */ 88 89 #define SCSI_SENSE_BUFFERSIZE 96 90 unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; 91 /* obtained by REQUEST SENSE when 92 * CHECK CONDITION is received on original 93 * command (auto-sense) */ 94 95 /* Low-level done function - can be used by low-level driver to point 96 * to completion function. Not used by mid/upper level code. */ 97 void (*scsi_done) (struct scsi_cmnd *); 98 99 /* 100 * The following fields can be written to by the host specific code. 101 * Everything else should be left alone. 102 */ 103 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 104 105 unsigned char *host_scribble; /* The host adapter is allowed to 106 * call scsi_malloc and get some memory 107 * and hang it here. The host adapter 108 * is also expected to call scsi_free 109 * to release this memory. (The memory 110 * obtained by scsi_malloc is guaranteed 111 * to be at an address < 16Mb). */ 112 113 int result; /* Status code from lower level driver */ 114 115 unsigned char tag; /* SCSI-II queued command tag */ 116 }; 117 118 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); 119 extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); 120 extern void scsi_put_command(struct scsi_cmnd *); 121 extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, 122 struct device *); 123 extern void scsi_finish_command(struct scsi_cmnd *cmd); 124 extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd); 125 126 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 127 size_t *offset, size_t *len); 128 extern void scsi_kunmap_atomic_sg(void *virt); 129 130 extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t); 131 extern void scsi_free_sgtable(struct scatterlist *, int); 132 133 extern int scsi_dma_map(struct scsi_cmnd *cmd); 134 extern void scsi_dma_unmap(struct scsi_cmnd *cmd); 135 136 #define scsi_sg_count(cmd) ((cmd)->use_sg) 137 #define scsi_sglist(cmd) ((struct scatterlist *)(cmd)->request_buffer) 138 #define scsi_bufflen(cmd) ((cmd)->request_bufflen) 139 140 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) 141 { 142 cmd->resid = resid; 143 } 144 145 static inline int scsi_get_resid(struct scsi_cmnd *cmd) 146 { 147 return cmd->resid; 148 } 149 150 #define scsi_for_each_sg(cmd, sg, nseg, __i) \ 151 for (__i = 0, sg = scsi_sglist(cmd); __i < (nseg); __i++, (sg)++) 152 153 #endif /* _SCSI_SCSI_CMND_H */ 154