The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright 2009 Scott Long
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions, and the following disclaimer,
   10  *    without modification, immediately at the beginning of the file.
   11  * 2. The name of the author may not be used to endorse or promote products
   12  *    derived from this software without specific prior written permission.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   18  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.3/sys/cam/cam_xpt_internal.h 278974 2015-02-18 23:08:13Z ken $
   27  */
   28 
   29 #ifndef _CAM_CAM_XPT_INTERNAL_H
   30 #define _CAM_CAM_XPT_INTERNAL_H 1
   31 
   32 #include <sys/taskqueue.h>
   33 
   34 /* Forward Declarations */
   35 struct cam_eb;
   36 struct cam_et;
   37 struct cam_ed;
   38 
   39 typedef struct cam_ed * (*xpt_alloc_device_func)(struct cam_eb *bus,
   40                                                  struct cam_et *target,
   41                                                  lun_id_t lun_id);
   42 typedef void (*xpt_release_device_func)(struct cam_ed *device);
   43 typedef void (*xpt_action_func)(union ccb *start_ccb);
   44 typedef void (*xpt_dev_async_func)(u_int32_t async_code,
   45                                    struct cam_eb *bus,
   46                                    struct cam_et *target,
   47                                    struct cam_ed *device,
   48                                    void *async_arg);
   49 typedef void (*xpt_announce_periph_func)(struct cam_periph *periph);
   50 
   51 struct xpt_xport {
   52         xpt_alloc_device_func   alloc_device;
   53         xpt_release_device_func reldev;
   54         xpt_action_func         action;
   55         xpt_dev_async_func      async;
   56         xpt_announce_periph_func announce;
   57 };
   58 
   59 /*
   60  * The CAM EDT (Existing Device Table) contains the device information for
   61  * all devices for all busses in the system.  The table contains a
   62  * cam_ed structure for each device on the bus.
   63  */
   64 struct cam_ed {
   65         cam_pinfo        devq_entry;
   66         TAILQ_ENTRY(cam_ed) links;
   67         struct  cam_et   *target;
   68         struct  cam_sim  *sim;
   69         lun_id_t         lun_id;
   70         struct  cam_ccbq ccbq;          /* Queue of pending ccbs */
   71         struct  async_list asyncs;      /* Async callback info for this B/T/L */
   72         struct  periph_list periphs;    /* All attached devices */
   73         u_int   generation;             /* Generation number */
   74         void             *quirk;        /* Oddities about this device */
   75         u_int            maxtags;
   76         u_int            mintags;
   77         cam_proto        protocol;
   78         u_int            protocol_version;
   79         cam_xport        transport;
   80         u_int            transport_version;
   81         struct           scsi_inquiry_data inq_data;
   82         uint8_t          *supported_vpds;
   83         uint8_t          supported_vpds_len;
   84         uint32_t         device_id_len;
   85         uint8_t          *device_id;
   86         uint32_t         ext_inq_len;
   87         uint8_t          *ext_inq;
   88         uint8_t          physpath_len;
   89         uint8_t          *physpath;     /* physical path string form */
   90         uint32_t         rcap_len;
   91         uint8_t          *rcap_buf;
   92         struct           ata_params ident_data;
   93         u_int8_t         inq_flags;     /*
   94                                          * Current settings for inquiry flags.
   95                                          * This allows us to override settings
   96                                          * like disconnection and tagged
   97                                          * queuing for a device.
   98                                          */
   99         u_int8_t         queue_flags;   /* Queue flags from the control page */
  100         u_int8_t         serial_num_len;
  101         u_int8_t        *serial_num;
  102         u_int32_t        flags;
  103 #define CAM_DEV_UNCONFIGURED            0x01
  104 #define CAM_DEV_REL_TIMEOUT_PENDING     0x02
  105 #define CAM_DEV_REL_ON_COMPLETE         0x04
  106 #define CAM_DEV_REL_ON_QUEUE_EMPTY      0x08
  107 #define CAM_DEV_TAG_AFTER_COUNT         0x20
  108 #define CAM_DEV_INQUIRY_DATA_VALID      0x40
  109 #define CAM_DEV_IN_DV                   0x80
  110 #define CAM_DEV_DV_HIT_BOTTOM           0x100
  111 #define CAM_DEV_IDENTIFY_DATA_VALID     0x200
  112         u_int32_t        tag_delay_count;
  113 #define CAM_TAG_DELAY_COUNT             5
  114         u_int32_t        tag_saved_openings;
  115         u_int32_t        refcount;
  116         struct callout   callout;
  117         STAILQ_ENTRY(cam_ed) highpowerq_entry;
  118         struct mtx       device_mtx;
  119         struct task      device_destroy_task;
  120 };
  121 
  122 /*
  123  * Each target is represented by an ET (Existing Target).  These
  124  * entries are created when a target is successfully probed with an
  125  * identify, and removed when a device fails to respond after a number
  126  * of retries, or a bus rescan finds the device missing.
  127  */
  128 struct cam_et {
  129         TAILQ_HEAD(, cam_ed) ed_entries;
  130         TAILQ_ENTRY(cam_et) links;
  131         struct  cam_eb  *bus;
  132         target_id_t     target_id;
  133         u_int32_t       refcount;
  134         u_int           generation;
  135         struct          timeval last_reset;
  136         u_int           rpl_size;
  137         struct scsi_report_luns_data *luns;
  138         struct mtx      luns_mtx;       /* Protection for luns field. */
  139 };
  140 
  141 /*
  142  * Each bus is represented by an EB (Existing Bus).  These entries
  143  * are created by calls to xpt_bus_register and deleted by calls to
  144  * xpt_bus_deregister.
  145  */
  146 struct cam_eb {
  147         TAILQ_HEAD(, cam_et) et_entries;
  148         TAILQ_ENTRY(cam_eb)  links;
  149         path_id_t            path_id;
  150         struct cam_sim       *sim;
  151         struct timeval       last_reset;
  152         u_int32_t            flags;
  153 #define CAM_EB_RUNQ_SCHEDULED   0x01
  154         u_int32_t            refcount;
  155         u_int                generation;
  156         device_t             parent_dev;
  157         struct xpt_xport     *xport;
  158         struct mtx           eb_mtx;    /* Bus topology mutex. */
  159 };
  160 
  161 struct cam_path {
  162         struct cam_periph *periph;
  163         struct cam_eb     *bus;
  164         struct cam_et     *target;
  165         struct cam_ed     *device;
  166 };
  167 
  168 struct xpt_xport *      scsi_get_xport(void);
  169 struct xpt_xport *      ata_get_xport(void);
  170 
  171 struct cam_ed *         xpt_alloc_device(struct cam_eb *bus,
  172                                          struct cam_et *target,
  173                                          lun_id_t lun_id);
  174 void                    xpt_acquire_device(struct cam_ed *device);
  175 void                    xpt_release_device(struct cam_ed *device);
  176 u_int32_t               xpt_dev_ccbq_resize(struct cam_path *path, int newopenings);
  177 void                    xpt_start_tags(struct cam_path *path);
  178 void                    xpt_stop_tags(struct cam_path *path);
  179 
  180 MALLOC_DECLARE(M_CAMXPT);
  181 
  182 #endif

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