FreeBSD/Linux Kernel Cross Reference
sys/cam/cam.h

     /*-
      * Data structures and definitions for the CAM system.
      *
      * Copyright (c) 1997 Justin T. Gibbs.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions, and the following disclaimer,
     *    without modification, immediately at the beginning of the file.
     * 2. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
     * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/8.0/sys/cam/cam.h 195534 2009-07-10 08:18:08Z scottl $
     */
    
    #ifndef _CAM_CAM_H
    #define _CAM_CAM_H 1
    
    #ifdef _KERNEL
    #include <opt_cam.h>
    #endif
    
    #include <sys/cdefs.h>
    
    typedef u_int path_id_t;
    typedef u_int target_id_t;
    typedef u_int lun_id_t;
    
    #define CAM_XPT_PATH_ID ((path_id_t)~0)
    #define CAM_BUS_WILDCARD ((path_id_t)~0)
    #define CAM_TARGET_WILDCARD ((target_id_t)~0)
    #define CAM_LUN_WILDCARD ((lun_id_t)~0)
    
    /*
     * Maximum length for a CAM CDB.  
     */
    #define CAM_MAX_CDBLEN 16
    
    /*
     * Definition of a CAM peripheral driver entry.  Peripheral drivers instantiate
     * one of these for each device they wish to communicate with and pass it into
     * the xpt layer when they wish to schedule work on that device via the
     * xpt_schedule API.
     */
    struct cam_periph;
    
    /*
     * Priority information for a CAM structure.  The generation number is
     * incremented everytime a new entry is entered into the queue giving round
     * robin per priority level scheduling.
     */
    typedef struct {
            u_int32_t priority;
    #define CAM_PRIORITY_NONE       (u_int32_t)-1
            u_int32_t generation;
            int       index;
    #define CAM_UNQUEUED_INDEX      -1
    #define CAM_ACTIVE_INDEX        -2      
    #define CAM_DONEQ_INDEX         -3      
    } cam_pinfo;
    
    /*
     * Macro to compare two generation numbers.  It is used like this:  
     *
     *      if (GENERATIONCMP(a, >=, b))
     *              ...;
     *
     * GERERATIONCMP uses modular arithmetic to guard against wraps
     * wraps in the generation number.
     */
    #define GENERATIONCMP(x, op, y) ((int32_t)((x) - (y)) op 0)
    
    /* CAM flags XXX Move to cam_periph.h ??? */
    typedef enum {
            CAM_FLAG_NONE           = 0x00,
            CAM_EXPECT_INQ_CHANGE   = 0x01,
            CAM_RETRY_SELTO         = 0x02 /* Retry Selection Timeouts */
    } cam_flags;
    
    /* CAM  Status field values */
    typedef enum {
            CAM_REQ_INPROG,         /* CCB request is in progress */
            CAM_REQ_CMP,            /* CCB request completed without error */
            CAM_REQ_ABORTED,        /* CCB request aborted by the host */
           CAM_UA_ABORT,           /* Unable to abort CCB request */
           CAM_REQ_CMP_ERR,        /* CCB request completed with an error */
           CAM_BUSY,               /* CAM subsystem is busy */
           CAM_REQ_INVALID,        /* CCB request was invalid */
           CAM_PATH_INVALID,       /* Supplied Path ID is invalid */
           CAM_DEV_NOT_THERE,      /* SCSI Device Not Installed/there */
           CAM_UA_TERMIO,          /* Unable to terminate I/O CCB request */
           CAM_SEL_TIMEOUT,        /* Target Selection Timeout */
           CAM_CMD_TIMEOUT,        /* Command timeout */
           CAM_SCSI_STATUS_ERROR,  /* SCSI error, look at error code in CCB */
           CAM_MSG_REJECT_REC,     /* Message Reject Received */
           CAM_SCSI_BUS_RESET,     /* SCSI Bus Reset Sent/Received */
           CAM_UNCOR_PARITY,       /* Uncorrectable parity error occurred */
           CAM_AUTOSENSE_FAIL = 0x10,/* Autosense: request sense cmd fail */
           CAM_NO_HBA,             /* No HBA Detected error */
           CAM_DATA_RUN_ERR,       /* Data Overrun error */
           CAM_UNEXP_BUSFREE,      /* Unexpected Bus Free */
           CAM_SEQUENCE_FAIL,      /* Target Bus Phase Sequence Failure */
           CAM_CCB_LEN_ERR,        /* CCB length supplied is inadequate */
           CAM_PROVIDE_FAIL,       /* Unable to provide requested capability */
           CAM_BDR_SENT,           /* A SCSI BDR msg was sent to target */
           CAM_REQ_TERMIO,         /* CCB request terminated by the host */
           CAM_UNREC_HBA_ERROR,    /* Unrecoverable Host Bus Adapter Error */
           CAM_REQ_TOO_BIG,        /* The request was too large for this host */
           CAM_REQUEUE_REQ,        /*
                                    * This request should be requeued to preserve
                                    * transaction ordering.  This typically occurs
                                    * when the SIM recognizes an error that should
                                    * freeze the queue and must place additional
                                    * requests for the target at the sim level
                                    * back into the XPT queue.
                                    */
           CAM_ATA_STATUS_ERROR,   /* ATA error, look at error code in CCB */
           CAM_SCSI_IT_NEXUS_LOST, /* Initiator/Target Nexus lost. */
           CAM_IDE = 0x33,         /* Initiator Detected Error */
           CAM_RESRC_UNAVAIL,      /* Resource Unavailable */
           CAM_UNACKED_EVENT,      /* Unacknowledged Event by Host */
           CAM_MESSAGE_RECV,       /* Message Received in Host Target Mode */
           CAM_INVALID_CDB,        /* Invalid CDB received in Host Target Mode */
           CAM_LUN_INVALID,        /* Lun supplied is invalid */
           CAM_TID_INVALID,        /* Target ID supplied is invalid */
           CAM_FUNC_NOTAVAIL,      /* The requested function is not available */
           CAM_NO_NEXUS,           /* Nexus is not established */
           CAM_IID_INVALID,        /* The initiator ID is invalid */
           CAM_CDB_RECVD,          /* The SCSI CDB has been received */
           CAM_LUN_ALRDY_ENA,      /* The LUN is already enabled for target mode */
           CAM_SCSI_BUSY,          /* SCSI Bus Busy */
   
           CAM_DEV_QFRZN = 0x40,   /* The DEV queue is frozen w/this err */
   
                                   /* Autosense data valid for target */
           CAM_AUTOSNS_VALID = 0x80,
           CAM_RELEASE_SIMQ = 0x100,/* SIM ready to take more commands */
           CAM_SIM_QUEUED   = 0x200,/* SIM has this command in it's queue */
   
           CAM_STATUS_MASK = 0x3F, /* Mask bits for just the status # */
   
                                   /* Target Specific Adjunct Status */
           CAM_SENT_SENSE = 0x40000000     /* sent sense with status */
   } cam_status;
   
   typedef enum {
           CAM_ESF_NONE            = 0x00,
           CAM_ESF_COMMAND         = 0x01,
           CAM_ESF_CAM_STATUS      = 0x02,
           CAM_ESF_PROTO_STATUS    = 0x04,
           CAM_ESF_ALL             = 0xff
   } cam_error_string_flags;
   
   typedef enum {
           CAM_EPF_NONE            = 0x00,
           CAM_EPF_MINIMAL         = 0x01,
           CAM_EPF_NORMAL          = 0x02,
           CAM_EPF_ALL             = 0x03,
           CAM_EPF_LEVEL_MASK      = 0x0f
           /* All bits above bit 3 are protocol-specific */
   } cam_error_proto_flags;
   
   typedef enum {
           CAM_ESF_PRINT_NONE      = 0x00,
           CAM_ESF_PRINT_STATUS    = 0x10,
           CAM_ESF_PRINT_SENSE     = 0x20
   } cam_error_scsi_flags;
   
   struct cam_status_entry
   {
           cam_status  status_code;
           const char *status_text;
   };
   
   extern const struct cam_status_entry cam_status_table[];
   extern const int num_cam_status_entries;
   union ccb;
   
   #ifdef SYSCTL_DECL      /* from sysctl.h */
   SYSCTL_DECL(_kern_cam);
   #endif
   
   __BEGIN_DECLS
   typedef int (cam_quirkmatch_t)(caddr_t, caddr_t);
   
   caddr_t cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
                          int entry_size, cam_quirkmatch_t *comp_func);
   
   void    cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen);
   
   int     cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len);
   const struct cam_status_entry*
           cam_fetch_status_entry(cam_status status);
   #ifdef _KERNEL
   char *  cam_error_string(union ccb *ccb, char *str, int str_len,
                            cam_error_string_flags flags,
                            cam_error_proto_flags proto_flags);
   void    cam_error_print(union ccb *ccb, cam_error_string_flags flags,
                           cam_error_proto_flags proto_flags);
   #else /* _KERNEL */
   struct cam_device;
   
   char *  cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
                            int str_len, cam_error_string_flags flags,
                            cam_error_proto_flags proto_flags);
   void    cam_error_print(struct cam_device *device, union ccb *ccb,
                           cam_error_string_flags flags,
                           cam_error_proto_flags proto_flags, FILE *ofile);
   #endif /* _KERNEL */
   __END_DECLS
   
   #ifdef _KERNEL
   static __inline void cam_init_pinfo(cam_pinfo *pinfo);
   
   static __inline void cam_init_pinfo(cam_pinfo *pinfo)
   {
           pinfo->priority = CAM_PRIORITY_NONE;    
           pinfo->index = CAM_UNQUEUED_INDEX;
   }
   #endif
   
   #endif /* _CAM_CAM_H */

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