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/8.2/sys/cam/cam_xpt_internal.h 204529 2010-03-01 19:19:30Z mav $
   27  */
   28 
   29 #ifndef _CAM_CAM_XPT_INTERNAL_H
   30 #define _CAM_CAM_XPT_INTERNAL_H 1
   31 
   32 /* Forward Declarations */
   33 struct cam_eb;
   34 struct cam_et;
   35 struct cam_ed;
   36 
   37 typedef struct cam_ed * (*xpt_alloc_device_func)(struct cam_eb *bus,
   38                                                  struct cam_et *target,
   39                                                  lun_id_t lun_id);
   40 typedef void (*xpt_release_device_func)(struct cam_ed *device);
   41 typedef void (*xpt_action_func)(union ccb *start_ccb);
   42 typedef void (*xpt_dev_async_func)(u_int32_t async_code,
   43                                    struct cam_eb *bus,
   44                                    struct cam_et *target,
   45                                    struct cam_ed *device,
   46                                    void *async_arg);
   47 typedef void (*xpt_announce_periph_func)(struct cam_periph *periph);
   48 
   49 struct xpt_xport {
   50         xpt_alloc_device_func   alloc_device;
   51         xpt_release_device_func reldev;
   52         xpt_action_func         action;
   53         xpt_dev_async_func      async;
   54         xpt_announce_periph_func announce;
   55 };
   56 
   57 /*
   58  * Structure for queueing a device in a run queue.
   59  * There is one run queue for allocating new ccbs,
   60  * and another for sending ccbs to the controller.
   61  */
   62 struct cam_ed_qinfo {
   63         cam_pinfo pinfo;
   64         struct    cam_ed *device;
   65 };
   66 
   67 /*
   68  * The CAM EDT (Existing Device Table) contains the device information for
   69  * all devices for all busses in the system.  The table contains a
   70  * cam_ed structure for each device on the bus.
   71  */
   72 struct cam_ed {
   73         TAILQ_ENTRY(cam_ed) links;
   74         struct  cam_ed_qinfo alloc_ccb_entry;
   75         struct  cam_ed_qinfo send_ccb_entry;
   76         struct  cam_et   *target;
   77         struct  cam_sim  *sim;
   78         lun_id_t         lun_id;
   79         struct  camq drvq;              /*
   80                                          * Queue of type drivers wanting to do
   81                                          * work on this device.
   82                                          */
   83         struct  cam_ccbq ccbq;          /* Queue of pending ccbs */
   84         struct  async_list asyncs;      /* Async callback info for this B/T/L */
   85         struct  periph_list periphs;    /* All attached devices */
   86         u_int   generation;             /* Generation number */
   87         struct  cam_periph *owner;      /* Peripheral driver's ownership tag */
   88         void             *quirk;        /* Oddities about this device */
   89         u_int            maxtags;
   90         u_int            mintags;
   91         cam_proto        protocol;
   92         u_int            protocol_version;
   93         cam_xport        transport;
   94         u_int            transport_version;
   95         struct           scsi_inquiry_data inq_data;
   96         struct           ata_params ident_data;
   97         u_int8_t         inq_flags;     /*
   98                                          * Current settings for inquiry flags.
   99                                          * This allows us to override settings
  100                                          * like disconnection and tagged
  101                                          * queuing for a device.
  102                                          */
  103         u_int8_t         queue_flags;   /* Queue flags from the control page */
  104         u_int8_t         serial_num_len;
  105         u_int8_t        *serial_num;
  106         u_int32_t        flags;
  107 #define CAM_DEV_UNCONFIGURED            0x01
  108 #define CAM_DEV_REL_TIMEOUT_PENDING     0x02
  109 #define CAM_DEV_REL_ON_COMPLETE         0x04
  110 #define CAM_DEV_REL_ON_QUEUE_EMPTY      0x08
  111 #define CAM_DEV_RESIZE_QUEUE_NEEDED     0x10
  112 #define CAM_DEV_TAG_AFTER_COUNT         0x20
  113 #define CAM_DEV_INQUIRY_DATA_VALID      0x40
  114 #define CAM_DEV_IN_DV                   0x80
  115 #define CAM_DEV_DV_HIT_BOTTOM           0x100
  116 #define CAM_DEV_IDENTIFY_DATA_VALID     0x200
  117         u_int32_t        tag_delay_count;
  118 #define CAM_TAG_DELAY_COUNT             5
  119         u_int32_t        tag_saved_openings;
  120         u_int32_t        refcount;
  121         struct callout   callout;
  122 };
  123 
  124 /*
  125  * Each target is represented by an ET (Existing Target).  These
  126  * entries are created when a target is successfully probed with an
  127  * identify, and removed when a device fails to respond after a number
  128  * of retries, or a bus rescan finds the device missing.
  129  */
  130 struct cam_et {
  131         TAILQ_HEAD(, cam_ed) ed_entries;
  132         TAILQ_ENTRY(cam_et) links;
  133         struct  cam_eb  *bus;
  134         target_id_t     target_id;
  135         u_int32_t       refcount;
  136         u_int           generation;
  137         struct          timeval last_reset;
  138 };
  139 
  140 /*
  141  * Each bus is represented by an EB (Existing Bus).  These entries
  142  * are created by calls to xpt_bus_register and deleted by calls to
  143  * xpt_bus_deregister.
  144  */
  145 struct cam_eb {
  146         TAILQ_HEAD(, cam_et) et_entries;
  147         TAILQ_ENTRY(cam_eb)  links;
  148         path_id_t            path_id;
  149         struct cam_sim       *sim;
  150         struct timeval       last_reset;
  151         u_int32_t            flags;
  152 #define CAM_EB_RUNQ_SCHEDULED   0x01
  153         u_int32_t            refcount;
  154         u_int                generation;
  155         device_t             parent_dev;
  156         struct xpt_xport     *xport;
  157 };
  158 
  159 struct cam_path {
  160         struct cam_periph *periph;
  161         struct cam_eb     *bus;
  162         struct cam_et     *target;
  163         struct cam_ed     *device;
  164 };
  165 
  166 struct xpt_xport *      scsi_get_xport(void);
  167 struct xpt_xport *      ata_get_xport(void);
  168 
  169 struct cam_ed *         xpt_alloc_device(struct cam_eb *bus,
  170                                          struct cam_et *target,
  171                                          lun_id_t lun_id);
  172 void                    xpt_acquire_device(struct cam_ed *device);
  173 void                    xpt_release_device(struct cam_ed *device);
  174 int                     xpt_schedule_dev(struct camq *queue, cam_pinfo *dev_pinfo,
  175                                          u_int32_t new_priority);
  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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FreeBSD/Linux Kernel Cross Reference sys/cam/cam_xpt_internal.h

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