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/8.0/sys/cam/cam_xpt_internal.h 195534 2009-07-10 08:18:08Z scottl $
   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_eb *bus,
   41                                         struct cam_et *target,
   42                                         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                                          char *announce_string);
   51 
   52 struct xpt_xport {
   53         xpt_alloc_device_func   alloc_device;
   54         xpt_release_device_func reldev;
   55         xpt_action_func         action;
   56         xpt_dev_async_func      async;
   57         xpt_announce_periph_func announce;
   58 };
   59 
   60 /*
   61  * Structure for queueing a device in a run queue.
   62  * There is one run queue for allocating new ccbs,
   63  * and another for sending ccbs to the controller.
   64  */
   65 struct cam_ed_qinfo {
   66         cam_pinfo pinfo;
   67         struct    cam_ed *device;
   68 };
   69 
   70 /*
   71  * The CAM EDT (Existing Device Table) contains the device information for
   72  * all devices for all busses in the system.  The table contains a
   73  * cam_ed structure for each device on the bus.
   74  */
   75 struct cam_ed {
   76         TAILQ_ENTRY(cam_ed) links;
   77         struct  cam_ed_qinfo alloc_ccb_entry;
   78         struct  cam_ed_qinfo send_ccb_entry;
   79         struct  cam_et   *target;
   80         struct  cam_sim  *sim;
   81         lun_id_t         lun_id;
   82         struct  camq drvq;              /*
   83                                          * Queue of type drivers wanting to do
   84                                          * work on this device.
   85                                          */
   86         struct  cam_ccbq ccbq;          /* Queue of pending ccbs */
   87         struct  async_list asyncs;      /* Async callback info for this B/T/L */
   88         struct  periph_list periphs;    /* All attached devices */
   89         u_int   generation;             /* Generation number */
   90         struct  cam_periph *owner;      /* Peripheral driver's ownership tag */
   91         void             *quirk;        /* Oddities about this device */
   92         u_int            maxtags;
   93         u_int            mintags;
   94         cam_proto        protocol;
   95         u_int            protocol_version;
   96         cam_xport        transport;
   97         u_int            transport_version;
   98         struct           scsi_inquiry_data inq_data;
   99         struct           ata_params ident_data;
  100         u_int8_t         inq_flags;     /*
  101                                          * Current settings for inquiry flags.
  102                                          * This allows us to override settings
  103                                          * like disconnection and tagged
  104                                          * queuing for a device.
  105                                          */
  106         u_int8_t         queue_flags;   /* Queue flags from the control page */
  107         u_int8_t         serial_num_len;
  108         u_int8_t        *serial_num;
  109         u_int32_t        qfrozen_cnt;
  110         u_int32_t        flags;
  111 #define CAM_DEV_UNCONFIGURED            0x01
  112 #define CAM_DEV_REL_TIMEOUT_PENDING     0x02
  113 #define CAM_DEV_REL_ON_COMPLETE         0x04
  114 #define CAM_DEV_REL_ON_QUEUE_EMPTY      0x08
  115 #define CAM_DEV_RESIZE_QUEUE_NEEDED     0x10
  116 #define CAM_DEV_TAG_AFTER_COUNT         0x20
  117 #define CAM_DEV_INQUIRY_DATA_VALID      0x40
  118 #define CAM_DEV_IN_DV                   0x80
  119 #define CAM_DEV_DV_HIT_BOTTOM           0x100
  120         u_int32_t        tag_delay_count;
  121 #define CAM_TAG_DELAY_COUNT             5
  122         u_int32_t        tag_saved_openings;
  123         u_int32_t        refcount;
  124         struct callout   callout;
  125 };
  126 
  127 /*
  128  * Each target is represented by an ET (Existing Target).  These
  129  * entries are created when a target is successfully probed with an
  130  * identify, and removed when a device fails to respond after a number
  131  * of retries, or a bus rescan finds the device missing.
  132  */
  133 struct cam_et {
  134         TAILQ_HEAD(, cam_ed) ed_entries;
  135         TAILQ_ENTRY(cam_et) links;
  136         struct  cam_eb  *bus;
  137         target_id_t     target_id;
  138         u_int32_t       refcount;
  139         u_int           generation;
  140         struct          timeval last_reset;
  141 };
  142 
  143 /*
  144  * Each bus is represented by an EB (Existing Bus).  These entries
  145  * are created by calls to xpt_bus_register and deleted by calls to
  146  * xpt_bus_deregister.
  147  */
  148 struct cam_eb {
  149         TAILQ_HEAD(, cam_et) et_entries;
  150         TAILQ_ENTRY(cam_eb)  links;
  151         path_id_t            path_id;
  152         struct cam_sim       *sim;
  153         struct timeval       last_reset;
  154         u_int32_t            flags;
  155 #define CAM_EB_RUNQ_SCHEDULED   0x01
  156         u_int32_t            refcount;
  157         u_int                generation;
  158         device_t             parent_dev;
  159         struct xpt_xport     *xport;
  160 };
  161 
  162 struct cam_path {
  163         struct cam_periph *periph;
  164         struct cam_eb     *bus;
  165         struct cam_et     *target;
  166         struct cam_ed     *device;
  167 };
  168 
  169 struct xpt_xport *      scsi_get_xport(void);
  170 struct xpt_xport *      ata_get_xport(void);
  171 
  172 struct cam_ed *         xpt_alloc_device(struct cam_eb *bus,
  173                                          struct cam_et *target,
  174                                          lun_id_t lun_id);
  175 void                    xpt_run_dev_sendq(struct cam_eb *bus);
  176 int                     xpt_schedule_dev(struct camq *queue, cam_pinfo *dev_pinfo,
  177                                          u_int32_t new_priority);
  178 u_int32_t               xpt_dev_ccbq_resize(struct cam_path *path, int newopenings);
  179 
  180 
  181 
  182 static __inline int
  183 xpt_schedule_dev_sendq(struct cam_eb *bus, struct cam_ed *dev)
  184 {
  185         int     retval;
  186 
  187         if (dev->ccbq.dev_openings > 0) {
  188                 /*
  189                  * The priority of a device waiting for controller
  190                  * resources is that of the the highest priority CCB
  191                  * enqueued.
  192                  */
  193                 retval =
  194                     xpt_schedule_dev(&bus->sim->devq->send_queue,
  195                                      &dev->send_ccb_entry.pinfo,
  196                                      CAMQ_GET_HEAD(&dev->ccbq.queue)->priority);
  197         } else {
  198                 retval = 0;
  199         }
  200         return (retval);
  201 }
  202 
  203 MALLOC_DECLARE(M_CAMXPT);
  204 
  205 #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