Simplify arguments to signal handlers on mips.

[FreeBSD/FreeBSD.git] / sys / cam / scsi / scsi_enc_ses.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2000 Matthew Jacob
 * Copyright (c) 2010 Spectra Logic Corporation
 * 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.
 */

/**
 * \file scsi_enc_ses.c
 *
 * Structures and routines specific && private to SES only
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>

#include <sys/ctype.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/sx.h>
#include <sys/systm.h>
#include <sys/types.h>

#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_periph.h>

#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_enc.h>
#include <cam/scsi/scsi_enc_internal.h>

/* SES Native Type Device Support */

/* SES Diagnostic Page Codes */
typedef enum {
        SesSupportedPages       = 0x0,
        SesConfigPage           = 0x1,
        SesControlPage          = 0x2,
        SesStatusPage           = SesControlPage,
        SesHelpTxt              = 0x3,
        SesStringOut            = 0x4,
        SesStringIn             = SesStringOut,
        SesThresholdOut         = 0x5,
        SesThresholdIn          = SesThresholdOut,
        SesArrayControl         = 0x6,  /* Obsolete in SES v2 */
        SesArrayStatus          = SesArrayControl,
        SesElementDescriptor    = 0x7,
        SesShortStatus          = 0x8,
        SesEnclosureBusy        = 0x9,
        SesAddlElementStatus    = 0xa
} SesDiagPageCodes;

typedef struct ses_type {
        const struct ses_elm_type_desc  *hdr;
        const char                      *text;
} ses_type_t;

typedef struct ses_comstat {
        uint8_t comstatus;
        uint8_t comstat[3];
} ses_comstat_t;

typedef union ses_addl_data {
        struct ses_elm_sas_device_phy *sasdev_phys;
        struct ses_elm_sas_expander_phy *sasexp_phys;
        struct ses_elm_sas_port_phy *sasport_phys;
        struct ses_fcobj_port *fc_ports;
} ses_add_data_t;

typedef struct ses_addl_status {
        struct ses_elm_addlstatus_base_hdr *hdr;
        union {
                union ses_fcobj_hdr *fc;
                union ses_elm_sas_hdr *sas;
                struct ses_elm_ata_hdr *ata;
        } proto_hdr;
        union ses_addl_data proto_data; /* array sizes stored in header */
} ses_add_status_t;

typedef struct ses_element {
        uint8_t eip;                    /* eip bit is set */
        uint16_t descr_len;             /* length of the descriptor */
        const char *descr;              /* descriptor for this object */
        struct ses_addl_status addl;    /* additional status info */
} ses_element_t;

typedef struct ses_control_request {
        int           elm_idx;
        ses_comstat_t elm_stat;
        int           result;
        TAILQ_ENTRY(ses_control_request) links;
} ses_control_request_t;
TAILQ_HEAD(ses_control_reqlist, ses_control_request);
typedef struct ses_control_reqlist ses_control_reqlist_t;
enum {
        SES_SETSTATUS_ENC_IDX = -1
};

static void
ses_terminate_control_requests(ses_control_reqlist_t *reqlist, int result)
{
        ses_control_request_t *req;

        while ((req = TAILQ_FIRST(reqlist)) != NULL) {
                TAILQ_REMOVE(reqlist, req, links);
                req->result = result;
                wakeup(req);
        }
}

enum ses_iter_index_values {
        /**
         * \brief  Value of an initialized but invalid index
         *         in a ses_iterator object.
         *
         * This value is used for the  individual_element_index of
         * overal status elements and for all index types when
         * an iterator is first initialized.
         */
        ITERATOR_INDEX_INVALID = -1,

        /**
         * \brief  Value of an index in a ses_iterator object
         *         when the iterator has traversed past the last
         *         valid element..
         */
        ITERATOR_INDEX_END     = INT_MAX
};

/**
 * \brief Structure encapsulating all data necessary to traverse the
 *        elements of a SES configuration.
 *
 * The ses_iterator object simplifies the task of iterating through all
 * elements detected via the SES configuration page by tracking the numerous
 * element indexes that, instead of memoizing in the softc, we calculate
 * on the fly during the traversal of the element objects.  The various
 * indexes are necessary due to the varying needs of matching objects in
 * the different SES pages.  Some pages (e.g. Status/Control) contain all
 * elements, while others (e.g. Additional Element Status) only contain
 * individual elements (no overal status elements) of particular types.
 *
 * To use an iterator, initialize it with ses_iter_init(), and then
 * use ses_iter_next() to traverse the elements (including the first) in
 * the configuration.  Once an iterator is initiailized with ses_iter_init(),
 * you may also seek to any particular element by either it's global or
 * individual element index via the ses_iter_seek_to() function.  You may
 * also return an iterator to the position just before the first element
 * (i.e. the same state as after an ses_iter_init()), with ses_iter_reset().
 */
struct ses_iterator {
        /**
         * \brief Backlink to the overal software configuration structure.
         *
         * This is included for convenience so the iteration functions
         * need only take a single, struct ses_iterator *, argument.
         */
        enc_softc_t *enc;

        enc_cache_t *cache;

        /**
         * \brief Index of the type of the current element within the
         *        ses_cache's ses_types array.
         */
        int               type_index;

        /**
         * \brief The position (0 based) of this element relative to all other
         *        elements of this type.
         *
         * This index resets to zero every time the iterator transitions
         * to elements of a new type in the configuration.
         */
        int               type_element_index;

        /**
         * \brief The position (0 based) of this element relative to all
         *        other individual status elements in the configuration.
         *
         * This index ranges from 0 through the number of individual
         * elements in the configuration.  When the iterator returns
         * an overall status element, individual_element_index is
         * set to ITERATOR_INDEX_INVALID, to indicate that it does
         * not apply to the current element.
         */
        int               individual_element_index;

        /**
         * \brief The position (0 based) of this element relative to
         *        all elements in the configration.
         *
         * This index is appropriate for indexing into enc->ses_elm_map.
         */
        int               global_element_index;

        /**
         * \brief The last valid individual element index of this
         *        iterator.
         *
         * When an iterator traverses an overal status element, the
         * individual element index is reset to ITERATOR_INDEX_INVALID
         * to prevent unintential use of the individual_element_index
         * field.  The saved_individual_element_index allows the iterator
         * to restore it's position in the individual elements upon
         * reaching the next individual element.
         */
        int               saved_individual_element_index;
};

typedef enum {
        SES_UPDATE_NONE,
        SES_UPDATE_PAGES,
        SES_UPDATE_GETCONFIG,
        SES_UPDATE_GETSTATUS,
        SES_UPDATE_GETELMDESCS,
        SES_UPDATE_GETELMADDLSTATUS,
        SES_PROCESS_CONTROL_REQS,
        SES_PUBLISH_PHYSPATHS,
        SES_PUBLISH_CACHE,
        SES_NUM_UPDATE_STATES
} ses_update_action;

static enc_softc_cleanup_t ses_softc_cleanup;

#define SCSZ    0x8000

static fsm_fill_handler_t ses_fill_rcv_diag_io;
static fsm_fill_handler_t ses_fill_control_request;
static fsm_done_handler_t ses_process_pages;
static fsm_done_handler_t ses_process_config;
static fsm_done_handler_t ses_process_status;
static fsm_done_handler_t ses_process_elm_descs;
static fsm_done_handler_t ses_process_elm_addlstatus;
static fsm_done_handler_t ses_process_control_request;
static fsm_done_handler_t ses_publish_physpaths;
static fsm_done_handler_t ses_publish_cache;

static struct enc_fsm_state enc_fsm_states[SES_NUM_UPDATE_STATES] =
{
        { "SES_UPDATE_NONE", 0, 0, 0, NULL, NULL, NULL },
        {
                "SES_UPDATE_PAGES",
                SesSupportedPages,
                SCSZ,
                60 * 1000,
                ses_fill_rcv_diag_io,
                ses_process_pages,
                enc_error
        },
        {
                "SES_UPDATE_GETCONFIG",
                SesConfigPage,
                SCSZ,
                60 * 1000,
                ses_fill_rcv_diag_io,
                ses_process_config,
                enc_error
        },
        {
                "SES_UPDATE_GETSTATUS",
                SesStatusPage,
                SCSZ,
                60 * 1000,
                ses_fill_rcv_diag_io,
                ses_process_status,
                enc_error
        },
        {
                "SES_UPDATE_GETELMDESCS",
                SesElementDescriptor,
                SCSZ,
                60 * 1000,
                ses_fill_rcv_diag_io,
                ses_process_elm_descs,
                enc_error
        },
        {
                "SES_UPDATE_GETELMADDLSTATUS",
                SesAddlElementStatus,
                SCSZ,
                60 * 1000,
                ses_fill_rcv_diag_io,
                ses_process_elm_addlstatus,
                enc_error
        },
        {
                "SES_PROCESS_CONTROL_REQS",
                SesControlPage,
                SCSZ,
                60 * 1000,
                ses_fill_control_request,
                ses_process_control_request,
                enc_error
        },
        {
                "SES_PUBLISH_PHYSPATHS",
                0,
                0,
                0,
                NULL,
                ses_publish_physpaths,
                NULL
        },
        {
                "SES_PUBLISH_CACHE",
                0,
                0,
                0,
                NULL,
                ses_publish_cache,
                NULL
        }
};

typedef struct ses_cache {
        /* Source for all the configuration data pointers */
        const struct ses_cfg_page               *cfg_page;

        /* References into the config page. */
        int                                      ses_nsubencs;
        const struct ses_enc_desc * const       *subencs;
        int                                      ses_ntypes;
        const ses_type_t                        *ses_types;

        /* Source for all the status pointers */
        const struct ses_status_page            *status_page;

        /* Source for all the object descriptor pointers */
        const struct ses_elem_descr_page        *elm_descs_page;

        /* Source for all the additional object status pointers */
        const struct ses_addl_elem_status_page  *elm_addlstatus_page;

} ses_cache_t;

typedef struct ses_softc {
        uint32_t                ses_flags;
#define SES_FLAG_TIMEDCOMP      0x01
#define SES_FLAG_ADDLSTATUS     0x02
#define SES_FLAG_DESC           0x04

        ses_control_reqlist_t   ses_requests;
        ses_control_reqlist_t   ses_pending_requests;
} ses_softc_t;

/**
 * \brief Reset a SES iterator to just before the first element
 *        in the configuration.
 *
 * \param iter  The iterator object to reset.
 *
 * The indexes within a reset iterator are invalid and will only
 * become valid upon completion of a ses_iter_seek_to() or a
 * ses_iter_next().
 */
static void
ses_iter_reset(struct ses_iterator *iter)
{
        /*
         * Set our indexes to just before the first valid element
         * of the first type (ITERATOR_INDEX_INVALID == -1).  This
         * simplifies the implementation of ses_iter_next().
         */
        iter->type_index                     = 0;
        iter->type_element_index             = ITERATOR_INDEX_INVALID;
        iter->global_element_index           = ITERATOR_INDEX_INVALID;
        iter->individual_element_index       = ITERATOR_INDEX_INVALID;
        iter->saved_individual_element_index = ITERATOR_INDEX_INVALID;
}

/**
 * \brief Initialize the storage of a SES iterator and reset it to
 *        the position just before the first element of the
 *        configuration.
 *
 * \param enc   The SES softc for the SES instance whose configuration
 *              will be enumerated by this iterator.
 * \param iter  The iterator object to initialize.
 */
static void
ses_iter_init(enc_softc_t *enc, enc_cache_t *cache, struct ses_iterator *iter)
{
        iter->enc = enc;
        iter->cache = cache;
        ses_iter_reset(iter);
}

/**
 * \brief Traverse the provided SES iterator to the next element
 *        within the configuraiton.
 *
 * \param iter  The iterator to move.
 *
 * \return  If a valid next element exists, a pointer to it's enc_element_t.
 *          Otherwise NULL.
 */
static enc_element_t *
ses_iter_next(struct ses_iterator *iter)
{
        ses_cache_t      *ses_cache;
        const ses_type_t *element_type;

        ses_cache = iter->cache->private;

        /*
         * Note: Treat nelms as signed, so we will hit this case
         *       and immediately terminate the iteration if the
         *       configuration has 0 objects.
         */
        if (iter->global_element_index >= (int)iter->cache->nelms - 1) {

                /* Elements exhausted. */
                iter->type_index               = ITERATOR_INDEX_END;
                iter->type_element_index       = ITERATOR_INDEX_END;
                iter->global_element_index     = ITERATOR_INDEX_END;
                iter->individual_element_index = ITERATOR_INDEX_END;
                iter->saved_individual_element_index = ITERATOR_INDEX_END;
                return (NULL);
        }

        KASSERT((iter->type_index < ses_cache->ses_ntypes),
                ("Corrupted element iterator. %d not less than %d",
                 iter->type_index, ses_cache->ses_ntypes));

        element_type = &ses_cache->ses_types[iter->type_index];
        iter->global_element_index++;
        iter->type_element_index++;

        /*
         * There is an object for overal type status in addition
         * to one for each allowed element, but only if the element
         * count is non-zero.
         */
        if (iter->type_element_index > element_type->hdr->etype_maxelt) {

                /*
                 * We've exhausted the elements of this type.
                 * This next element belongs to the next type.
                 */
                iter->type_index++;
                iter->type_element_index = 0;
                iter->individual_element_index = ITERATOR_INDEX_INVALID;
        }

        if (iter->type_element_index > 0) {
                iter->individual_element_index =
                    ++iter->saved_individual_element_index;
        }

        return (&iter->cache->elm_map[iter->global_element_index]);
}

/**
 * Element index types tracked by a SES iterator.
 */
typedef enum {
        /**
         * Index relative to all elements (overall and individual)
         * in the system.
         */
        SES_ELEM_INDEX_GLOBAL,

        /**
         * \brief Index relative to all individual elements in the system.
         *
         * This index counts only individual elements, skipping overall
         * status elements.  This is the index space of the additional
         * element status page (page 0xa).
         */
        SES_ELEM_INDEX_INDIVIDUAL
} ses_elem_index_type_t;

/**
 * \brief Move the provided iterator forwards or backwards to the object 
 *        having the give index.
 *
 * \param iter           The iterator on which to perform the seek.
 * \param element_index  The index of the element to find.
 * \param index_type     The type (global or individual) of element_index.
 *
 * \return  If the element is found, a pointer to it's enc_element_t.
 *          Otherwise NULL.
 */
static enc_element_t *
ses_iter_seek_to(struct ses_iterator *iter, int element_index,
                 ses_elem_index_type_t index_type)
{
        enc_element_t   *element;
        int             *cur_index;

        if (index_type == SES_ELEM_INDEX_GLOBAL)
                cur_index = &iter->global_element_index;
        else
                cur_index = &iter->individual_element_index;

        if (*cur_index == element_index) {
                /* Already there. */
                return (&iter->cache->elm_map[iter->global_element_index]);
        }

        ses_iter_reset(iter);
        while ((element = ses_iter_next(iter)) != NULL
            && *cur_index != element_index)
                ;

        if (*cur_index != element_index)
                return (NULL);

        return (element);
}

#if 0
static int ses_encode(enc_softc_t *, uint8_t *, int, int,
    struct ses_comstat *);
#endif
static int ses_set_timed_completion(enc_softc_t *, uint8_t);
#if 0
static int ses_putstatus(enc_softc_t *, int, struct ses_comstat *);
#endif

static void ses_poll_status(enc_softc_t *);
static void ses_print_addl_data(enc_softc_t *, enc_element_t *);

/*=========================== SES cleanup routines ===========================*/

static void
ses_cache_free_elm_addlstatus(enc_softc_t *enc, enc_cache_t *cache)
{
        ses_cache_t   *ses_cache;
        ses_cache_t   *other_ses_cache;
        enc_element_t *cur_elm;
        enc_element_t *last_elm;

        ENC_DLOG(enc, "%s: enter\n", __func__);
        ses_cache = cache->private;
        if (ses_cache->elm_addlstatus_page == NULL)
                return;

        for (cur_elm = cache->elm_map,
             last_elm = &cache->elm_map[cache->nelms];
             cur_elm != last_elm; cur_elm++) {
                ses_element_t *elmpriv;

                elmpriv = cur_elm->elm_private;

                /* Clear references to the additional status page. */
                bzero(&elmpriv->addl, sizeof(elmpriv->addl));
        }

        other_ses_cache = enc_other_cache(enc, cache)->private;
        if (other_ses_cache->elm_addlstatus_page
         != ses_cache->elm_addlstatus_page)
                ENC_FREE(ses_cache->elm_addlstatus_page);
        ses_cache->elm_addlstatus_page = NULL;
}

static void
ses_cache_free_elm_descs(enc_softc_t *enc, enc_cache_t *cache)
{
        ses_cache_t   *ses_cache;
        ses_cache_t   *other_ses_cache;
        enc_element_t *cur_elm;
        enc_element_t *last_elm;

        ENC_DLOG(enc, "%s: enter\n", __func__);
        ses_cache = cache->private;
        if (ses_cache->elm_descs_page == NULL)
                return;

        for (cur_elm = cache->elm_map,
             last_elm = &cache->elm_map[cache->nelms];
             cur_elm != last_elm; cur_elm++) {
                ses_element_t *elmpriv;

                elmpriv = cur_elm->elm_private;
                elmpriv->descr_len = 0;
                elmpriv->descr = NULL;
        }

        other_ses_cache = enc_other_cache(enc, cache)->private;
        if (other_ses_cache->elm_descs_page
         != ses_cache->elm_descs_page)
                ENC_FREE(ses_cache->elm_descs_page);
        ses_cache->elm_descs_page = NULL;
}

static void
ses_cache_free_status(enc_softc_t *enc, enc_cache_t *cache)
{
        ses_cache_t *ses_cache;
        ses_cache_t *other_ses_cache;

        ENC_DLOG(enc, "%s: enter\n", __func__);
        ses_cache   = cache->private;
        if (ses_cache->status_page == NULL)
                return;
        
        other_ses_cache = enc_other_cache(enc, cache)->private;
        if (other_ses_cache->status_page != ses_cache->status_page)
                ENC_FREE(ses_cache->status_page);
        ses_cache->status_page = NULL;
}

static void
ses_cache_free_elm_map(enc_softc_t *enc, enc_cache_t *cache)
{
        enc_element_t *cur_elm;
        enc_element_t *last_elm;

        ENC_DLOG(enc, "%s: enter\n", __func__);
        if (cache->elm_map == NULL)
                return;

        ses_cache_free_elm_descs(enc, cache);
        ses_cache_free_elm_addlstatus(enc, cache);
        for (cur_elm = cache->elm_map,
             last_elm = &cache->elm_map[cache->nelms];
             cur_elm != last_elm; cur_elm++) {

                ENC_FREE_AND_NULL(cur_elm->elm_private);
        }
        ENC_FREE_AND_NULL(cache->elm_map);
        cache->nelms = 0;
        ENC_DLOG(enc, "%s: exit\n", __func__);
}

static void
ses_cache_free(enc_softc_t *enc, enc_cache_t *cache)
{
        ses_cache_t *other_ses_cache;
        ses_cache_t *ses_cache;

        ENC_DLOG(enc, "%s: enter\n", __func__);
        ses_cache_free_elm_addlstatus(enc, cache);
        ses_cache_free_status(enc, cache);
        ses_cache_free_elm_map(enc, cache);

        ses_cache = cache->private;
        ses_cache->ses_ntypes = 0;

        other_ses_cache = enc_other_cache(enc, cache)->private;
        if (other_ses_cache->subencs != ses_cache->subencs)
                ENC_FREE(ses_cache->subencs);
        ses_cache->subencs = NULL;

        if (other_ses_cache->ses_types != ses_cache->ses_types)
                ENC_FREE(ses_cache->ses_types);
        ses_cache->ses_types = NULL;

        if (other_ses_cache->cfg_page != ses_cache->cfg_page)
                ENC_FREE(ses_cache->cfg_page);
        ses_cache->cfg_page = NULL;

        ENC_DLOG(enc, "%s: exit\n", __func__);
}

static void
ses_cache_clone(enc_softc_t *enc, enc_cache_t *src, enc_cache_t *dst)
{
        ses_cache_t   *dst_ses_cache;
        ses_cache_t   *src_ses_cache;
        enc_element_t *src_elm;
        enc_element_t *dst_elm;
        enc_element_t *last_elm;

        ses_cache_free(enc, dst);
        src_ses_cache = src->private;
        dst_ses_cache = dst->private;

        /*
         * The cloned enclosure cache and ses specific cache are
         * mostly identical to the source.
         */
        *dst = *src;
        *dst_ses_cache = *src_ses_cache;

        /*
         * But the ses cache storage is still independent.  Restore
         * the pointer that was clobbered by the structure copy above.
         */
        dst->private = dst_ses_cache;

        /*
         * The element map is independent even though it starts out
         * pointing to the same constant page data.
         */
        dst->elm_map = malloc(dst->nelms * sizeof(enc_element_t),
            M_SCSIENC, M_WAITOK);
        memcpy(dst->elm_map, src->elm_map, dst->nelms * sizeof(enc_element_t));
        for (dst_elm = dst->elm_map, src_elm = src->elm_map,
             last_elm = &src->elm_map[src->nelms];
             src_elm != last_elm; src_elm++, dst_elm++) {

                dst_elm->elm_private = malloc(sizeof(ses_element_t),
                    M_SCSIENC, M_WAITOK);
                memcpy(dst_elm->elm_private, src_elm->elm_private,
                       sizeof(ses_element_t));
        }
}

/* Structure accessors.  These are strongly typed to avoid errors. */

int
ses_elm_sas_descr_type(union ses_elm_sas_hdr *obj)
{
        return ((obj)->base_hdr.byte1 >> 6);
}
int
ses_elm_addlstatus_proto(struct ses_elm_addlstatus_base_hdr *hdr)
{
        return ((hdr)->byte0 & 0xf);
}
int
ses_elm_addlstatus_eip(struct ses_elm_addlstatus_base_hdr *hdr)
{
        return ((hdr)->byte0 >> 4) & 0x1;
}
int
ses_elm_addlstatus_invalid(struct ses_elm_addlstatus_base_hdr *hdr)
{
        return ((hdr)->byte0 >> 7);
}
int
ses_elm_sas_type0_not_all_phys(union ses_elm_sas_hdr *hdr)
{
        return ((hdr)->type0_noneip.byte1 & 0x1);
}
int
ses_elm_sas_dev_phy_sata_dev(struct ses_elm_sas_device_phy *phy)
{
        return ((phy)->target_ports & 0x1);
}
int
ses_elm_sas_dev_phy_sata_port(struct ses_elm_sas_device_phy *phy)
{
        return ((phy)->target_ports >> 7);
}
int
ses_elm_sas_dev_phy_dev_type(struct ses_elm_sas_device_phy *phy)
{
        return (((phy)->byte0 >> 4) & 0x7);
}

/**
 * \brief Verify that the cached configuration data in our softc
 *        is valid for processing the page data corresponding to
 *        the provided page header.
 *
 * \param ses_cache The SES cache to validate.
 * \param gen_code  The 4 byte generation code from a SES diagnostic
 *                  page header.
 *
 * \return  non-zero if true, 0 if false.
 */
static int
ses_config_cache_valid(ses_cache_t *ses_cache, const uint8_t *gen_code)
{
        uint32_t cache_gc;
        uint32_t cur_gc;

        if (ses_cache->cfg_page == NULL)
                return (0);

        cache_gc = scsi_4btoul(ses_cache->cfg_page->hdr.gen_code);
        cur_gc   = scsi_4btoul(gen_code);
        return (cache_gc == cur_gc);
}

/**
 * Function signature for consumers of the ses_devids_iter() interface.
 */
typedef void ses_devid_callback_t(enc_softc_t *, enc_element_t *,
                                  struct scsi_vpd_id_descriptor *, void *);

/**
 * \brief Iterate over and create vpd device id records from the
 *        additional element status data for elm, passing that data
 *        to the provided callback.
 *
 * \param enc           SES instance containing elm
 * \param elm           Element for which to extract device ID data.
 * \param callback      The callback function to invoke on each generated
 *                      device id descriptor for elm.
 * \param callback_arg  Argument passed through to callback on each invocation.
 */
static void
ses_devids_iter(enc_softc_t *enc, enc_element_t *elm,
                ses_devid_callback_t *callback, void *callback_arg)
{
        ses_element_t           *elmpriv;
        struct ses_addl_status *addl;
        u_int                   i;
        size_t                  devid_record_size;

        elmpriv = elm->elm_private;
        addl = &(elmpriv->addl);

        devid_record_size = SVPD_DEVICE_ID_DESC_HDR_LEN
                          + sizeof(struct scsi_vpd_id_naa_ieee_reg);
        for (i = 0; i < addl->proto_hdr.sas->base_hdr.num_phys; i++) {
                uint8_t                        devid_buf[devid_record_size];
                struct scsi_vpd_id_descriptor *devid;
                uint8_t                       *phy_addr;

                devid = (struct scsi_vpd_id_descriptor *)devid_buf;
                phy_addr = addl->proto_data.sasdev_phys[i].phy_addr;
                devid->proto_codeset = (SCSI_PROTO_SAS << SVPD_ID_PROTO_SHIFT)
                                     | SVPD_ID_CODESET_BINARY;
                devid->id_type       = SVPD_ID_PIV
                                     | SVPD_ID_ASSOC_PORT
                                     | SVPD_ID_TYPE_NAA;
                devid->reserved      = 0;
                devid->length        = sizeof(struct scsi_vpd_id_naa_ieee_reg);
                memcpy(devid->identifier, phy_addr, devid->length);

                callback(enc, elm, devid, callback_arg);
        }
}

/**
 * Function signature for consumers of the ses_paths_iter() interface.
 */
typedef void ses_path_callback_t(enc_softc_t *, enc_element_t *,
                                 struct cam_path *, void *);

/**
 * Argument package passed through ses_devids_iter() by
 * ses_paths_iter() to ses_path_iter_devid_callback().
 */
typedef struct ses_path_iter_args {
        ses_path_callback_t *callback;
        void                *callback_arg;
} ses_path_iter_args_t;

/**
 * ses_devids_iter() callback function used by ses_paths_iter()
 * to map device ids to peripheral driver instances.
 *
 * \param enc     SES instance containing elm
 * \param elm     Element on which device ID matching is active.
 * \param periph  A device ID corresponding to elm.
 * \param arg     Argument passed through to callback on each invocation.
 */
static void
ses_path_iter_devid_callback(enc_softc_t *enc, enc_element_t *elem,
                               struct scsi_vpd_id_descriptor *devid,
                               void *arg)
{
        struct ccb_dev_match         cdm;
        struct dev_match_pattern     match_pattern;
        struct dev_match_result      match_result;
        struct device_match_result  *device_match;
        struct device_match_pattern *device_pattern;
        ses_path_iter_args_t        *args;
        struct cam_path             *path;

        args = (ses_path_iter_args_t *)arg;
        match_pattern.type = DEV_MATCH_DEVICE;
        device_pattern = &match_pattern.pattern.device_pattern;
        device_pattern->flags = DEV_MATCH_DEVID;
        device_pattern->data.devid_pat.id_len = 
            offsetof(struct scsi_vpd_id_descriptor, identifier)
          + devid->length;
        memcpy(device_pattern->data.devid_pat.id, devid,
               device_pattern->data.devid_pat.id_len);

        memset(&cdm, 0, sizeof(cdm));
        if (xpt_create_path(&cdm.ccb_h.path, /*periph*/NULL,
                             CAM_XPT_PATH_ID,
                             CAM_TARGET_WILDCARD,
                             CAM_LUN_WILDCARD) != CAM_REQ_CMP)
                return;

        cdm.ccb_h.func_code = XPT_DEV_MATCH;
        cdm.num_patterns    = 1;
        cdm.patterns        = &match_pattern;
        cdm.pattern_buf_len = sizeof(match_pattern);
        cdm.match_buf_len   = sizeof(match_result);
        cdm.matches         = &match_result;

        do {
                xpt_action((union ccb *)&cdm);

                if ((cdm.ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP ||
                    (cdm.status != CAM_DEV_MATCH_LAST &&
                     cdm.status != CAM_DEV_MATCH_MORE) ||
                    cdm.num_matches == 0)
                        break;

                device_match = &match_result.result.device_result;
                if (xpt_create_path(&path, /*periph*/NULL,
                                    device_match->path_id,
                                    device_match->target_id,
                                    device_match->target_lun) == CAM_REQ_CMP) {

                        args->callback(enc, elem, path, args->callback_arg);

                        xpt_free_path(path);
                }
        } while (cdm.status == CAM_DEV_MATCH_MORE);

        xpt_free_path(cdm.ccb_h.path);
}

/**
 * \brief Iterate over and find the matching periph objects for the
 *        specified element.
 *
 * \param enc           SES instance containing elm
 * \param elm           Element for which to perform periph object matching.
 * \param callback      The callback function to invoke with each matching
 *                      periph object.
 * \param callback_arg  Argument passed through to callback on each invocation.
 */
static void
ses_paths_iter(enc_softc_t *enc, enc_element_t *elm,
               ses_path_callback_t *callback, void *callback_arg)
{
        ses_element_t *elmpriv;
        struct ses_addl_status *addl;

        elmpriv = elm->elm_private;
        addl = &(elmpriv->addl);

        if (addl->hdr == NULL)
                return;

        if (addl->proto_hdr.sas != NULL &&
            addl->proto_data.sasdev_phys != NULL) {
                ses_path_iter_args_t args;

                args.callback     = callback;
                args.callback_arg = callback_arg;
                ses_devids_iter(enc, elm, ses_path_iter_devid_callback, &args);
        } else if (addl->proto_hdr.ata != NULL) {
                struct cam_path *path;
                struct ccb_getdev cgd;

                if (xpt_create_path(&path, /*periph*/NULL,
                    scsi_4btoul(addl->proto_hdr.ata->bus),
                    scsi_4btoul(addl->proto_hdr.ata->target), 0)
                     != CAM_REQ_CMP)
                        return;

                xpt_setup_ccb(&cgd.ccb_h, path, CAM_PRIORITY_NORMAL);
                cgd.ccb_h.func_code = XPT_GDEV_TYPE;
                xpt_action((union ccb *)&cgd);
                if (cgd.ccb_h.status == CAM_REQ_CMP)
                        callback(enc, elm, path, callback_arg);

                xpt_free_path(path);
        }
}

/**
 * ses_paths_iter() callback function used by ses_get_elmdevname()
 * to record periph driver instance strings corresponding to a SES
 * element.
 *
 * \param enc     SES instance containing elm
 * \param elm     Element on which periph matching is active.
 * \param periph  A periph instance that matches elm.
 * \param arg     Argument passed through to callback on each invocation.
 */
static void
ses_elmdevname_callback(enc_softc_t *enc, enc_element_t *elem,
                        struct cam_path *path, void *arg)
{
        struct sbuf *sb;

        sb = (struct sbuf *)arg;
        cam_periph_list(path, sb);
}

/**
 * Argument package passed through ses_paths_iter() to
 * ses_getcampath_callback.
 */
typedef struct ses_setphyspath_callback_args {
        struct sbuf *physpath;
        int          num_set;
} ses_setphyspath_callback_args_t;

/**
 * \brief ses_paths_iter() callback to set the physical path on the
 *        CAM EDT entries corresponding to a given SES element.
 *
 * \param enc     SES instance containing elm
 * \param elm     Element on which periph matching is active.
 * \param periph  A periph instance that matches elm.
 * \param arg     Argument passed through to callback on each invocation.
 */
static void
ses_setphyspath_callback(enc_softc_t *enc, enc_element_t *elm,
                         struct cam_path *path, void *arg)
{
        struct ccb_dev_advinfo cdai;
        ses_setphyspath_callback_args_t *args;
        char *old_physpath;

        args = (ses_setphyspath_callback_args_t *)arg;
        old_physpath = malloc(MAXPATHLEN, M_SCSIENC, M_WAITOK|M_ZERO);
        xpt_path_lock(path);
        xpt_setup_ccb(&cdai.ccb_h, path, CAM_PRIORITY_NORMAL);
        cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
        cdai.buftype = CDAI_TYPE_PHYS_PATH;
        cdai.flags = CDAI_FLAG_NONE;
        cdai.bufsiz = MAXPATHLEN;
        cdai.buf = old_physpath;
        xpt_action((union ccb *)&cdai);
        if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
                cam_release_devq(cdai.ccb_h.path, 0, 0, 0, FALSE);

        if (strcmp(old_physpath, sbuf_data(args->physpath)) != 0) {

                xpt_setup_ccb(&cdai.ccb_h, path, CAM_PRIORITY_NORMAL);
                cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
                cdai.buftype = CDAI_TYPE_PHYS_PATH;
                cdai.flags = CDAI_FLAG_STORE;
                cdai.bufsiz = sbuf_len(args->physpath);
                cdai.buf = sbuf_data(args->physpath);
                xpt_action((union ccb *)&cdai);
                if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
                        cam_release_devq(cdai.ccb_h.path, 0, 0, 0, FALSE);
                if (cdai.ccb_h.status == CAM_REQ_CMP)
                        args->num_set++;
        }
        xpt_path_unlock(path);
        free(old_physpath, M_SCSIENC);
}

/**
 * \brief Set a device's physical path string in CAM XPT.
 *
 * \param enc   SES instance containing elm
 * \param elm   Element to publish physical path string for
 * \param iter  Iterator whose state corresponds to elm
 *
 * \return      0 on success, errno otherwise.
 */
static int
ses_set_physpath(enc_softc_t *enc, enc_element_t *elm,
                 struct ses_iterator *iter)
{
        struct ccb_dev_advinfo cdai;
        ses_setphyspath_callback_args_t args;
        int i, ret;
        struct sbuf sb;
        struct scsi_vpd_id_descriptor *idd;
        uint8_t *devid;
        ses_element_t *elmpriv;
        const char *c;

        ret = EIO;
        devid = NULL;

        elmpriv = elm->elm_private;
        if (elmpriv->addl.hdr == NULL)
                goto out;

        /*
         * Assemble the components of the physical path starting with
         * the device ID of the enclosure itself.
         */
        xpt_setup_ccb(&cdai.ccb_h, enc->periph->path, CAM_PRIORITY_NORMAL);
        cdai.ccb_h.func_code = XPT_DEV_ADVINFO;
        cdai.flags = CDAI_FLAG_NONE;
        cdai.buftype = CDAI_TYPE_SCSI_DEVID;
        cdai.bufsiz = CAM_SCSI_DEVID_MAXLEN;
        cdai.buf = devid = malloc(cdai.bufsiz, M_SCSIENC, M_WAITOK|M_ZERO);
        cam_periph_lock(enc->periph);
        xpt_action((union ccb *)&cdai);
        if ((cdai.ccb_h.status & CAM_DEV_QFRZN) != 0)
                cam_release_devq(cdai.ccb_h.path, 0, 0, 0, FALSE);
        cam_periph_unlock(enc->periph);
        if (cdai.ccb_h.status != CAM_REQ_CMP)
                goto out;

        idd = scsi_get_devid((struct scsi_vpd_device_id *)cdai.buf,
            cdai.provsiz, scsi_devid_is_naa_ieee_reg);
        if (idd == NULL)
                goto out;

        if (sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND) == NULL) {
                ret = ENOMEM;
                goto out;
        }
        /* Next, generate the physical path string */
        sbuf_printf(&sb, "id1,enc@n%jx/type@%x/slot@%x",
            scsi_8btou64(idd->identifier), iter->type_index,
            iter->type_element_index);
        /* Append the element descriptor if one exists */
        if (elmpriv->descr != NULL && elmpriv->descr_len > 0) {
                sbuf_cat(&sb, "/elmdesc@");
                for (i = 0, c = elmpriv->descr; i < elmpriv->descr_len;
                    i++, c++) {
                        if (!isprint(*c) || isspace(*c) || *c == '/')
                                sbuf_putc(&sb, '_');
                        else
                                sbuf_putc(&sb, *c);
                }
        }
        sbuf_finish(&sb);

        /*
         * Set this physical path on any CAM devices with a device ID
         * descriptor that matches one created from the SES additional
         * status data for this element.
         */
        args.physpath= &sb;
        args.num_set = 0;
        ses_paths_iter(enc, elm, ses_setphyspath_callback, &args);
        sbuf_delete(&sb);

        ret = args.num_set == 0 ? ENOENT : 0;

out:
        if (devid != NULL)
                ENC_FREE(devid);
        return (ret);
}

/**
 * \brief Helper to set the CDB fields appropriately.
 *
 * \param cdb           Buffer containing the cdb.
 * \param pagenum       SES diagnostic page to query for.
 * \param dir           Direction of query.
 */
static void
ses_page_cdb(char *cdb, int bufsiz, SesDiagPageCodes pagenum, int dir)
{

        /* Ref: SPC-4 r25 Section 6.20 Table 223 */
        if (dir == CAM_DIR_IN) {
                cdb[0] = RECEIVE_DIAGNOSTIC;
                cdb[1] = 1; /* Set page code valid bit */
                cdb[2] = pagenum;
        } else {
                cdb[0] = SEND_DIAGNOSTIC;
                cdb[1] = 0x10;
                cdb[2] = pagenum;
        }
        cdb[3] = bufsiz >> 8;   /* high bits */
        cdb[4] = bufsiz & 0xff; /* low bits */
        cdb[5] = 0;
}

/**
 * \brief Discover whether this instance supports timed completion of a
 *        RECEIVE DIAGNOSTIC RESULTS command requesting the Enclosure Status
 *        page, and store the result in the softc, updating if necessary.
 *
 * \param enc   SES instance to query and update.
 * \param tc_en Value of timed completion to set (see \return).
 *
 * \return      1 if timed completion enabled, 0 otherwise.
 */
static int
ses_set_timed_completion(enc_softc_t *enc, uint8_t tc_en)
{
        union ccb *ccb;
        struct cam_periph *periph;
        struct ses_mgmt_mode_page *mgmt;
        uint8_t *mode_buf;
        size_t mode_buf_len;
        ses_softc_t *ses;

        periph = enc->periph;
        ses = enc->enc_private;
        ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);

        mode_buf_len = sizeof(struct ses_mgmt_mode_page);
        mode_buf = ENC_MALLOCZ(mode_buf_len);
        if (mode_buf == NULL)
                goto out;

        scsi_mode_sense(&ccb->csio, /*retries*/4, NULL, MSG_SIMPLE_Q_TAG,
            /*dbd*/FALSE, SMS_PAGE_CTRL_CURRENT, SES_MGMT_MODE_PAGE_CODE,
            mode_buf, mode_buf_len, SSD_FULL_SIZE, /*timeout*/60 * 1000);

        /*
         * Ignore illegal request errors, as they are quite common and we
         * will print something out in that case anyway.
         */
        cam_periph_runccb(ccb, enc_error, ENC_CFLAGS,
            ENC_FLAGS|SF_QUIET_IR, NULL);
        if (ccb->ccb_h.status != CAM_REQ_CMP) {
                ENC_VLOG(enc, "Timed Completion Unsupported\n");
                goto release;
        }

        /* Skip the mode select if the desired value is already set */
        mgmt = (struct ses_mgmt_mode_page *)mode_buf;
        if ((mgmt->byte5 & SES_MGMT_TIMED_COMP_EN) == tc_en)
                goto done;

        /* Value is not what we wanted, set it */
        if (tc_en)
                mgmt->byte5 |= SES_MGMT_TIMED_COMP_EN;
        else
                mgmt->byte5 &= ~SES_MGMT_TIMED_COMP_EN;
        /* SES2r20: a completion time of zero means as long as possible */
        bzero(&mgmt->max_comp_time, sizeof(mgmt->max_comp_time));

        scsi_mode_select(&ccb->csio, 5, NULL, MSG_SIMPLE_Q_TAG,
            /*page_fmt*/FALSE, /*save_pages*/TRUE, mode_buf, mode_buf_len,
            SSD_FULL_SIZE, /*timeout*/60 * 1000);

        cam_periph_runccb(ccb, enc_error, ENC_CFLAGS, ENC_FLAGS, NULL);
        if (ccb->ccb_h.status != CAM_REQ_CMP) {
                ENC_VLOG(enc, "Timed Completion Set Failed\n");
                goto release;
        }

done:
        if ((mgmt->byte5 & SES_MGMT_TIMED_COMP_EN) != 0) {
                ENC_LOG(enc, "Timed Completion Enabled\n");
                ses->ses_flags |= SES_FLAG_TIMEDCOMP;
        } else {
                ENC_LOG(enc, "Timed Completion Disabled\n");
                ses->ses_flags &= ~SES_FLAG_TIMEDCOMP;
        }
release:
        ENC_FREE(mode_buf);
        xpt_release_ccb(ccb);
out:
        return (ses->ses_flags & SES_FLAG_TIMEDCOMP);
}

/**
 * \brief Process the list of supported pages and update flags.
 *
 * \param enc       SES device to query.
 * \param buf       Buffer containing the config page.
 * \param xfer_len  Length of the config page in the buffer.
 *
 * \return  0 on success, errno otherwise.
 */
static int
ses_process_pages(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        ses_softc_t *ses;
        struct scsi_diag_page *page;
        int err, i, length;

        CAM_DEBUG(enc->periph->path, CAM_DEBUG_SUBTRACE,
            ("entering %s(%p, %d)\n", __func__, bufp, xfer_len));
        ses = enc->enc_private;
        err = -1;

        if (error != 0) {
                err = error;
                goto out;
        }
        if (xfer_len < sizeof(*page)) {
                ENC_VLOG(enc, "Unable to parse Diag Pages List Header\n");
                err = EIO;
                goto out;
        }
        page = (struct scsi_diag_page *)*bufp;
        length = scsi_2btoul(page->length);
        if (length + offsetof(struct scsi_diag_page, params) > xfer_len) {
                ENC_VLOG(enc, "Diag Pages List Too Long\n");
                goto out;
        }
        ENC_DLOG(enc, "%s: page length %d, xfer_len %d\n",
                 __func__, length, xfer_len);

        err = 0;
        for (i = 0; i < length; i++) {
                if (page->params[i] == SesElementDescriptor)
                        ses->ses_flags |= SES_FLAG_DESC;
                else if (page->params[i] == SesAddlElementStatus)
                        ses->ses_flags |= SES_FLAG_ADDLSTATUS;
        }

out:
        ENC_DLOG(enc, "%s: exiting with err %d\n", __func__, err);
        return (err);
}

/**
 * \brief Process the config page and update associated structures.
 *
 * \param enc       SES device to query.
 * \param buf       Buffer containing the config page.
 * \param xfer_len  Length of the config page in the buffer.
 *
 * \return  0 on success, errno otherwise.
 */
static int
ses_process_config(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        struct ses_iterator iter;
        ses_softc_t *ses;
        enc_cache_t *enc_cache;
        ses_cache_t *ses_cache;
        uint8_t *buf;
        int length;
        int err;
        int nelm;
        int ntype;
        struct ses_cfg_page *cfg_page;
        struct ses_enc_desc *buf_subenc;
        const struct ses_enc_desc **subencs;
        const struct ses_enc_desc **cur_subenc;
        const struct ses_enc_desc **last_subenc;
        ses_type_t *ses_types;
        ses_type_t *sestype;
        const struct ses_elm_type_desc *cur_buf_type;
        const struct ses_elm_type_desc *last_buf_type;
        uint8_t *last_valid_byte;
        enc_element_t *element;
        const char *type_text;

        CAM_DEBUG(enc->periph->path, CAM_DEBUG_SUBTRACE,
            ("entering %s(%p, %d)\n", __func__, bufp, xfer_len));
        ses = enc->enc_private;
        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;
        buf = *bufp;
        err = -1;

        if (error != 0) {
                err = error;
                goto out;
        }
        if (xfer_len < sizeof(cfg_page->hdr)) {
                ENC_VLOG(enc, "Unable to parse SES Config Header\n");
                err = EIO;
                goto out;
        }

        cfg_page = (struct ses_cfg_page *)buf;
        length = ses_page_length(&cfg_page->hdr);
        if (length > xfer_len) {
                ENC_VLOG(enc, "Enclosure Config Page Too Long\n");
                goto out;
        }
        last_valid_byte = &buf[length - 1];

        ENC_DLOG(enc, "%s: total page length %d, xfer_len %d\n",
                 __func__, length, xfer_len);

        err = 0;
        if (ses_config_cache_valid(ses_cache, cfg_page->hdr.gen_code)) {

                /* Our cache is still valid.  Proceed to fetching status. */
                goto out;
        }

        /* Cache is no longer valid.  Free old data to make way for new. */
        ses_cache_free(enc, enc_cache);
        ENC_VLOG(enc, "Generation Code 0x%x has %d SubEnclosures\n",
            scsi_4btoul(cfg_page->hdr.gen_code),
            ses_cfg_page_get_num_subenc(cfg_page));

        /* Take ownership of the buffer. */
        ses_cache->cfg_page = cfg_page;
        *bufp = NULL;

        /*
         * Now waltz through all the subenclosures summing the number of
         * types available in each.
         */
        subencs = malloc(ses_cfg_page_get_num_subenc(cfg_page)
            * sizeof(*subencs), M_SCSIENC, M_WAITOK|M_ZERO);
        /*
         * Sub-enclosure data is const after construction (i.e. when
         * accessed via our cache object.
         *
         * The cast here is not required in C++ but C99 is not so
         * sophisticated (see C99 6.5.16.1(1)).
         */
        ses_cache->ses_nsubencs = ses_cfg_page_get_num_subenc(cfg_page);
        ses_cache->subencs = subencs;

        buf_subenc = cfg_page->subencs;
        cur_subenc = subencs;
        last_subenc = &subencs[ses_cache->ses_nsubencs - 1];
        ntype = 0;
        while (cur_subenc <= last_subenc) {

                if (!ses_enc_desc_is_complete(buf_subenc, last_valid_byte)) {
                        ENC_VLOG(enc, "Enclosure %d Beyond End of "
                            "Descriptors\n", cur_subenc - subencs);
                        err = EIO;
                        goto out;
                }

                ENC_VLOG(enc, " SubEnclosure ID %d, %d Types With this ID, "
                    "Descriptor Length %d, offset %d\n", buf_subenc->subenc_id,
                    buf_subenc->num_types, buf_subenc->length,
                    &buf_subenc->byte0 - buf);
                ENC_VLOG(enc, "WWN: %jx\n",
                    (uintmax_t)scsi_8btou64(buf_subenc->logical_id));

                ntype += buf_subenc->num_types;
                *cur_subenc = buf_subenc;
                cur_subenc++;
                buf_subenc = ses_enc_desc_next(buf_subenc);
        }

        /* Process the type headers. */
        ses_types = malloc(ntype * sizeof(*ses_types),
            M_SCSIENC, M_WAITOK|M_ZERO);
        /*
         * Type data is const after construction (i.e. when accessed via
         * our cache object.
         */
        ses_cache->ses_ntypes = ntype;
        ses_cache->ses_types = ses_types;

        cur_buf_type = (const struct ses_elm_type_desc *)
            (&(*last_subenc)->length + (*last_subenc)->length + 1);
        last_buf_type = cur_buf_type + ntype - 1;
        type_text = (const uint8_t *)(last_buf_type + 1);
        nelm = 0;
        sestype = ses_types;
        while (cur_buf_type <= last_buf_type) {
                if (&cur_buf_type->etype_txt_len > last_valid_byte) {
                        ENC_VLOG(enc, "Runt Enclosure Type Header %d\n",
                            sestype - ses_types);
                        err = EIO;
                        goto out;
                }
                sestype->hdr  = cur_buf_type;
                sestype->text = type_text;
                type_text += cur_buf_type->etype_txt_len;
                ENC_VLOG(enc, " Type Desc[%d]: Type 0x%x, MaxElt %d, In Subenc "
                    "%d, Text Length %d: %.*s\n", sestype - ses_types,
                    sestype->hdr->etype_elm_type, sestype->hdr->etype_maxelt,
                    sestype->hdr->etype_subenc, sestype->hdr->etype_txt_len,
                    sestype->hdr->etype_txt_len, sestype->text);

                nelm += sestype->hdr->etype_maxelt
                      + /*overall status element*/1;
                sestype++;
                cur_buf_type++;
        }

        /* Create the object map. */
        enc_cache->elm_map = malloc(nelm * sizeof(enc_element_t),
            M_SCSIENC, M_WAITOK|M_ZERO);
        enc_cache->nelms = nelm;

        ses_iter_init(enc, enc_cache, &iter);
        while ((element = ses_iter_next(&iter)) != NULL) {
                const struct ses_elm_type_desc *thdr;

                ENC_DLOG(enc, "%s: checking obj %d(%d,%d)\n", __func__,
                    iter.global_element_index, iter.type_index, nelm,
                    iter.type_element_index);
                thdr = ses_cache->ses_types[iter.type_index].hdr;
                element->elm_idx = iter.global_element_index;
                element->elm_type = thdr->etype_elm_type;
                element->subenclosure = thdr->etype_subenc;
                element->type_elm_idx = iter.type_element_index;
                element->elm_private = malloc(sizeof(ses_element_t),
                    M_SCSIENC, M_WAITOK|M_ZERO);
                ENC_DLOG(enc, "%s: creating elmpriv %d(%d,%d) subenc %d "
                    "type 0x%x\n", __func__, iter.global_element_index,
                    iter.type_index, iter.type_element_index,
                    thdr->etype_subenc, thdr->etype_elm_type);
        }

        err = 0;

out:
        if (err)
                ses_cache_free(enc, enc_cache);
        else {
                ses_poll_status(enc);
                enc_update_request(enc, SES_PUBLISH_CACHE);
        }
        ENC_DLOG(enc, "%s: exiting with err %d\n", __func__, err);
        return (err);
}

/**
 * \brief Update the status page and associated structures.
 * 
 * \param enc   SES softc to update for.
 * \param buf   Buffer containing the status page.
 * \param bufsz Amount of data in the buffer.
 *
 * \return      0 on success, errno otherwise.
 */
static int
ses_process_status(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        struct ses_iterator iter;
        enc_element_t *element;
        ses_softc_t *ses;
        enc_cache_t *enc_cache;
        ses_cache_t *ses_cache;
        uint8_t *buf;
        int err = -1;
        int length;
        struct ses_status_page *page;
        union ses_status_element *cur_stat;
        union ses_status_element *last_stat;

        ses = enc->enc_private;
        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;
        buf = *bufp;

        ENC_DLOG(enc, "%s: enter (%p, %p, %d)\n", __func__, enc, buf, xfer_len);
        page = (struct ses_status_page *)buf;
        length = ses_page_length(&page->hdr);

        if (error != 0) {
                err = error;
                goto out;
        }
        /*
         * Make sure the length fits in the buffer.
         *
         * XXX all this means is that the page is larger than the space
         * we allocated.  Since we use a statically sized buffer, this
         * could happen... Need to use dynamic discovery of the size.
         */
        if (length > xfer_len) {
                ENC_VLOG(enc, "Enclosure Status Page Too Long\n");
                goto out;
        }

        /* Check for simple enclosure reporting short enclosure status. */
        if (length >= 4 && page->hdr.page_code == SesShortStatus) {
                ENC_DLOG(enc, "Got Short Enclosure Status page\n");
                ses->ses_flags &= ~(SES_FLAG_ADDLSTATUS | SES_FLAG_DESC);
                ses_cache_free(enc, enc_cache);
                enc_cache->enc_status = page->hdr.page_specific_flags;
                enc_update_request(enc, SES_PUBLISH_CACHE);
                err = 0;
                goto out;
        }

        /* Make sure the length contains at least one header and status */
        if (length < (sizeof(*page) + sizeof(*page->elements))) {
                ENC_VLOG(enc, "Enclosure Status Page Too Short\n");
                goto out;
        }

        if (!ses_config_cache_valid(ses_cache, page->hdr.gen_code)) {
                ENC_DLOG(enc, "%s: Generation count change detected\n",
                    __func__);
                enc_update_request(enc, SES_UPDATE_GETCONFIG);
                goto out;
        }

        ses_cache_free_status(enc, enc_cache);
        ses_cache->status_page = page;
        *bufp = NULL;

        enc_cache->enc_status = page->hdr.page_specific_flags;

        /*
         * Read in individual element status.  The element order
         * matches the order reported in the config page (i.e. the
         * order of an unfiltered iteration of the config objects)..
         */
        ses_iter_init(enc, enc_cache, &iter);
        cur_stat  = page->elements;
        last_stat = (union ses_status_element *)
            &buf[length - sizeof(*last_stat)];
        ENC_DLOG(enc, "%s: total page length %d, xfer_len %d\n",
                __func__, length, xfer_len);
        while (cur_stat <= last_stat
            && (element = ses_iter_next(&iter)) != NULL) {

                ENC_DLOG(enc, "%s: obj %d(%d,%d) off=0x%tx status=%jx\n",
                    __func__, iter.global_element_index, iter.type_index,
                    iter.type_element_index, (uint8_t *)cur_stat - buf,
                    scsi_4btoul(cur_stat->bytes));

                memcpy(&element->encstat, cur_stat, sizeof(element->encstat));
                element->svalid = 1;
                cur_stat++;
        }

        if (ses_iter_next(&iter) != NULL) {
                ENC_VLOG(enc, "Status page, length insufficient for "
                        "expected number of objects\n");
        } else {
                if (cur_stat <= last_stat)
                        ENC_VLOG(enc, "Status page, exhausted objects before "
                                "exhausing page\n");
                enc_update_request(enc, SES_PUBLISH_CACHE);
                err = 0;
        }
out:
        ENC_DLOG(enc, "%s: exiting with error %d\n", __func__, err);
        return (err);
}

typedef enum {
        /**
         * The enclosure should not provide additional element
         * status for this element type in page 0x0A.
         *
         * \note  This status is returned for any types not
         *        listed SES3r02.  Further types added in a
         *        future specification will be incorrectly
         *        classified.
         */
        TYPE_ADDLSTATUS_NONE,

        /**
         * The element type provides additional element status
         * in page 0x0A.
         */
        TYPE_ADDLSTATUS_MANDATORY,

        /**
         * The element type may provide additional element status
         * in page 0x0A, but i
         */
        TYPE_ADDLSTATUS_OPTIONAL
} ses_addlstatus_avail_t;

/**
 * \brief Check to see whether a given type (as obtained via type headers) is
 *        supported by the additional status command.
 *
 * \param enc     SES softc to check.
 * \param typidx  Type index to check for.
 *
 * \return  An enumeration indicating if additional status is mandatory,
 *          optional, or not required for this type.
 */
static ses_addlstatus_avail_t
ses_typehasaddlstatus(enc_softc_t *enc, uint8_t typidx)
{
        enc_cache_t *enc_cache;
        ses_cache_t *ses_cache;

        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;
        switch(ses_cache->ses_types[typidx].hdr->etype_elm_type) {
        case ELMTYP_DEVICE:
        case ELMTYP_ARRAY_DEV:
        case ELMTYP_SAS_EXP:
                return (TYPE_ADDLSTATUS_MANDATORY);
        case ELMTYP_SCSI_INI:
        case ELMTYP_SCSI_TGT:
        case ELMTYP_ESCC:
                return (TYPE_ADDLSTATUS_OPTIONAL);
        default:
                /* No additional status information available. */
                break;
        }
        return (TYPE_ADDLSTATUS_NONE);
}

static int ses_get_elm_addlstatus_fc(enc_softc_t *, enc_cache_t *,
                                     uint8_t *, int);
static int ses_get_elm_addlstatus_sas(enc_softc_t *, enc_cache_t *, uint8_t *,
                                      int, int, int, int);
static int ses_get_elm_addlstatus_ata(enc_softc_t *, enc_cache_t *, uint8_t *,
                                      int, int, int, int);

/**
 * \brief Parse the additional status element data for each object.
 *
 * \param enc       The SES softc to update.
 * \param buf       The buffer containing the additional status
 *                  element response.
 * \param xfer_len  Size of the buffer.
 *
 * \return  0 on success, errno otherwise.
 */
static int
ses_process_elm_addlstatus(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        struct ses_iterator iter, titer;
        int eip;
        int err;
        int length;
        int offset;
        enc_cache_t *enc_cache;
        ses_cache_t *ses_cache;
        uint8_t *buf;
        ses_element_t *elmpriv;
        const struct ses_page_hdr *hdr;
        enc_element_t *element, *telement;

        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;
        buf = *bufp;
        err = -1;

        if (error != 0) {
                err = error;
                goto out;
        }
        ses_cache_free_elm_addlstatus(enc, enc_cache);
        ses_cache->elm_addlstatus_page =
            (struct ses_addl_elem_status_page *)buf;
        *bufp = NULL;

        /*
         * The objects appear in the same order here as in Enclosure Status,
         * which itself is ordered by the Type Descriptors from the Config
         * page.  However, it is necessary to skip elements that are not
         * supported by this page when counting them.
         */
        hdr = &ses_cache->elm_addlstatus_page->hdr;
        length = ses_page_length(hdr);
        ENC_DLOG(enc, "Additional Element Status Page Length 0x%x\n", length);
        /* Make sure the length includes at least one header. */
        if (length < sizeof(*hdr)+sizeof(struct ses_elm_addlstatus_base_hdr)) {
                ENC_VLOG(enc, "Runt Additional Element Status Page\n");
                goto out;
        }
        if (length > xfer_len) {
                ENC_VLOG(enc, "Additional Element Status Page Too Long\n");
                goto out;
        }

        if (!ses_config_cache_valid(ses_cache, hdr->gen_code)) {
                ENC_DLOG(enc, "%s: Generation count change detected\n",
                    __func__);
                enc_update_request(enc, SES_UPDATE_GETCONFIG);
                goto out;
        }

        offset = sizeof(struct ses_page_hdr);
        ses_iter_init(enc, enc_cache, &iter);
        while (offset < length
            && (element = ses_iter_next(&iter)) != NULL) {
                struct ses_elm_addlstatus_base_hdr *elm_hdr;
                int proto_info_len;
                ses_addlstatus_avail_t status_type;

                /*
                 * Additional element status is only provided for
                 * individual elements (i.e. overal status elements
                 * are excluded) and those of the types specified
                 * in the SES spec.
                 */
                status_type = ses_typehasaddlstatus(enc, iter.type_index);
                if (iter.individual_element_index == ITERATOR_INDEX_INVALID
                 || status_type == TYPE_ADDLSTATUS_NONE)
                        continue;

                elm_hdr = (struct ses_elm_addlstatus_base_hdr *)&buf[offset];
                eip = ses_elm_addlstatus_eip(elm_hdr);
                if (eip) {
                        struct ses_elm_addlstatus_eip_hdr *eip_hdr;
                        int expected_index, index;
                        ses_elem_index_type_t index_type;

                        eip_hdr = (struct ses_elm_addlstatus_eip_hdr *)elm_hdr;
                        if (eip_hdr->byte2 & SES_ADDL_EIP_EIIOE) {
                                index_type = SES_ELEM_INDEX_GLOBAL;
                                expected_index = iter.global_element_index;
                        } else {
                                index_type = SES_ELEM_INDEX_INDIVIDUAL;
                                expected_index = iter.individual_element_index;
                        }
                        if (eip_hdr->element_index < expected_index) {
                                ENC_VLOG(enc, "%s: provided %selement index "
                                    "%d is lower then expected %d\n",
                                    __func__, (eip_hdr->byte2 &
                                    SES_ADDL_EIP_EIIOE) ? "global " : "",
                                    eip_hdr->element_index, expected_index);
                                goto badindex;
                        }
                        titer = iter;
                        telement = ses_iter_seek_to(&titer,
                            eip_hdr->element_index, index_type);
                        if (telement == NULL) {
                                ENC_VLOG(enc, "%s: provided %selement index "
                                    "%d does not exist\n", __func__,
                                    (eip_hdr->byte2 & SES_ADDL_EIP_EIIOE) ?
                                    "global " : "", eip_hdr->element_index);
                                goto badindex;
                        }
                        if (ses_typehasaddlstatus(enc, titer.type_index) ==
                            TYPE_ADDLSTATUS_NONE) {
                                ENC_VLOG(enc, "%s: provided %selement index "
                                    "%d can't have additional status\n",
                                    __func__,
                                    (eip_hdr->byte2 & SES_ADDL_EIP_EIIOE) ?
                                    "global " : "", eip_hdr->element_index);
badindex:
                                /*
                                 * If we expected mandatory element, we may
                                 * guess it was just a wrong index and we may
                                 * use the status.  If element was optional,
                                 * then we have no idea where status belongs.
                                 */
                                if (status_type == TYPE_ADDLSTATUS_OPTIONAL)
                                        break;
                        } else {
                                iter = titer;
                                element = telement;
                        }

                        if (eip_hdr->byte2 & SES_ADDL_EIP_EIIOE)
                                index = iter.global_element_index;
                        else
                                index = iter.individual_element_index;
                        if (index > expected_index
                         && status_type == TYPE_ADDLSTATUS_MANDATORY) {
                                ENC_VLOG(enc, "%s: provided %s element"
                                        "index %d skips mandatory status "
                                        " element at index %d\n",
                                        __func__, (eip_hdr->byte2 &
                                        SES_ADDL_EIP_EIIOE) ? "global " : "",
                                        index, expected_index);
                        }
                }
                elmpriv = element->elm_private;
                ENC_DLOG(enc, "%s: global element index=%d, type index=%d "
                    "type element index=%d, offset=0x%x, "
                    "byte0=0x%x, length=0x%x\n", __func__,
                    iter.global_element_index, iter.type_index,
                    iter.type_element_index, offset, elm_hdr->byte0,
                    elm_hdr->length);

                /* Skip to after the length field */
                offset += sizeof(struct ses_elm_addlstatus_base_hdr);

                /* Make sure the descriptor is within bounds */
                if ((offset + elm_hdr->length) > length) {
                        ENC_VLOG(enc, "Element %d Beyond End "
                            "of Additional Element Status Descriptors\n",
                            iter.global_element_index);
                        break;
                }

                /* Skip elements marked as invalid. */
                if (ses_elm_addlstatus_invalid(elm_hdr)) {
                        offset += elm_hdr->length;
                        continue;
                }
                elmpriv->addl.hdr = elm_hdr;

                /* Advance to the protocol data, skipping eip bytes if needed */
                offset += (eip * SES_EIP_HDR_EXTRA_LEN);
                proto_info_len = elm_hdr->length
                               - (eip * SES_EIP_HDR_EXTRA_LEN);

                /* Errors in this block are ignored as they are non-fatal */
                switch(ses_elm_addlstatus_proto(elm_hdr)) {
                case SPSP_PROTO_FC:
                        if (elm_hdr->length == 0)
                                break;
                        ses_get_elm_addlstatus_fc(enc, enc_cache,
                                                  &buf[offset], proto_info_len);
                        break;
                case SPSP_PROTO_SAS:
                        if (elm_hdr->length <= 2)
                                break;
                        ses_get_elm_addlstatus_sas(enc, enc_cache,
                                                   &buf[offset],
                                                   proto_info_len,
                                                   eip, iter.type_index,
                                                   iter.global_element_index);
                        break;
                case SPSP_PROTO_ATA:
                        ses_get_elm_addlstatus_ata(enc, enc_cache,
                                                   &buf[offset],
                                                   proto_info_len,
                                                   eip, iter.type_index,
                                                   iter.global_element_index);
                        break;
                default:
                        ENC_VLOG(enc, "Element %d: Unknown Additional Element "
                            "Protocol 0x%x\n", iter.global_element_index,
                            ses_elm_addlstatus_proto(elm_hdr));
                        break;
                }

                offset += proto_info_len;
        }
        err = 0;
out:
        if (err)
                ses_cache_free_elm_addlstatus(enc, enc_cache);
        enc_update_request(enc, SES_PUBLISH_PHYSPATHS);
        enc_update_request(enc, SES_PUBLISH_CACHE);
        return (err);
}

static int
ses_process_control_request(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        ses_softc_t *ses;

        ses = enc->enc_private;
        /*
         * Possible errors:
         *  o Generation count wrong.
         *  o Some SCSI status error.
         */
        ses_terminate_control_requests(&ses->ses_pending_requests, error);
        ses_poll_status(enc);
        return (0);
}

static int
ses_publish_physpaths(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        struct ses_iterator iter;
        enc_cache_t *enc_cache;
        enc_element_t *element;

        enc_cache = &enc->enc_daemon_cache;

        ses_iter_init(enc, enc_cache, &iter);
        while ((element = ses_iter_next(&iter)) != NULL) {
                /*
                 * ses_set_physpath() returns success if we changed
                 * the physpath of any element.  This allows us to
                 * only announce devices once regardless of how
                 * many times we process additional element status.
                 */
                if (ses_set_physpath(enc, element, &iter) == 0)
                        ses_print_addl_data(enc, element);
        }

        return (0);
}

static int
ses_publish_cache(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{

        sx_xlock(&enc->enc_cache_lock);
        ses_cache_clone(enc, /*src*/&enc->enc_daemon_cache,
                        /*dst*/&enc->enc_cache);
        sx_xunlock(&enc->enc_cache_lock);

        return (0);
}

/*
 * \brief Sanitize an element descriptor
 *
 * The SES4r3 standard, sections 3.1.2 and 6.1.10, specifies that element
 * descriptors may only contain ASCII characters in the range 0x20 to 0x7e.
 * But some vendors violate that rule.  Ensure that we only expose compliant
 * descriptors to userland.
 *
 * \param desc          SES element descriptor as reported by the hardware
 * \param len           Length of desc in bytes, not necessarily including
 *                      trailing NUL.  It will be modified if desc is invalid.
 */
static const char*
ses_sanitize_elm_desc(const char *desc, uint16_t *len)
{
        const char *invalid = "<invalid>";
        int i;

        for (i = 0; i < *len; i++) {
                if (desc[i] < 0x20 || desc[i] > 0x7e) {
                        *len = strlen(invalid);
                        return (invalid);
                } else if (desc[i] == 0) {
                        break;
                }
        }
        return (desc);
}

/**
 * \brief Parse the descriptors for each object.
 *
 * \param enc       The SES softc to update.
 * \param buf       The buffer containing the descriptor list response.
 * \param xfer_len  Size of the buffer.
 * 
 * \return      0 on success, errno otherwise.
 */
static int
ses_process_elm_descs(enc_softc_t *enc, struct enc_fsm_state *state,
    union ccb *ccb, uint8_t **bufp, int error, int xfer_len)
{
        ses_softc_t *ses;
        struct ses_iterator iter;
        enc_element_t *element;
        int err;
        int offset;
        u_long length, plength;
        enc_cache_t *enc_cache;
        ses_cache_t *ses_cache;
        uint8_t *buf;
        ses_element_t *elmpriv;
        const struct ses_page_hdr *phdr;
        const struct ses_elm_desc_hdr *hdr;

        ses = enc->enc_private;
        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;
        buf = *bufp;
        err = -1;

        if (error != 0) {
                err = error;
                goto out;
        }
        ses_cache_free_elm_descs(enc, enc_cache);
        ses_cache->elm_descs_page = (struct ses_elem_descr_page *)buf;
        *bufp = NULL;

        phdr = &ses_cache->elm_descs_page->hdr;
        plength = ses_page_length(phdr);
        if (xfer_len < sizeof(struct ses_page_hdr)) {
                ENC_VLOG(enc, "Runt Element Descriptor Page\n");
                goto out;
        }
        if (plength > xfer_len) {
                ENC_VLOG(enc, "Element Descriptor Page Too Long\n");
                goto out;
        }

        if (!ses_config_cache_valid(ses_cache, phdr->gen_code)) {
                ENC_VLOG(enc, "%s: Generation count change detected\n",
                    __func__);
                enc_update_request(enc, SES_UPDATE_GETCONFIG);
                goto out;
        }

        offset = sizeof(struct ses_page_hdr);

        ses_iter_init(enc, enc_cache, &iter);
        while (offset < plength
            && (element = ses_iter_next(&iter)) != NULL) {

                if ((offset + sizeof(struct ses_elm_desc_hdr)) > plength) {
                        ENC_VLOG(enc, "Element %d Descriptor Header Past "
                            "End of Buffer\n", iter.global_element_index);
                        goto out;
                }
                hdr = (struct ses_elm_desc_hdr *)&buf[offset];
                length = scsi_2btoul(hdr->length);
                ENC_DLOG(enc, "%s: obj %d(%d,%d) length=%d off=%d\n", __func__,
                    iter.global_element_index, iter.type_index,
                    iter.type_element_index, length, offset);
                if ((offset + sizeof(*hdr) + length) > plength) {
                        ENC_VLOG(enc, "Element%d Descriptor Past "
                            "End of Buffer\n", iter.global_element_index);
                        goto out;
                }
                offset += sizeof(*hdr);

                if (length > 0) {
                        elmpriv = element->elm_private;
                        elmpriv->descr_len = length;
                        elmpriv->descr = ses_sanitize_elm_desc(&buf[offset],
                            &elmpriv->descr_len);
                }

                /* skip over the descriptor itself */
                offset += length;
        }

        err = 0;
out:
        if (err == 0) {
                if (ses->ses_flags & SES_FLAG_ADDLSTATUS)
                        enc_update_request(enc, SES_UPDATE_GETELMADDLSTATUS);
        }
        enc_update_request(enc, SES_PUBLISH_CACHE);
        return (err);
}

static int
ses_fill_rcv_diag_io(enc_softc_t *enc, struct enc_fsm_state *state,
                       union ccb *ccb, uint8_t *buf)
{

        if (enc->enc_type == ENC_SEMB_SES) {
                semb_receive_diagnostic_results(&ccb->ataio, /*retries*/5,
                                        NULL, MSG_SIMPLE_Q_TAG, /*pcv*/1,
                                        state->page_code, buf, state->buf_size,
                                        state->timeout);
        } else {
                scsi_receive_diagnostic_results(&ccb->csio, /*retries*/5,
                                        NULL, MSG_SIMPLE_Q_TAG, /*pcv*/1,
                                        state->page_code, buf, state->buf_size,
                                        SSD_FULL_SIZE, state->timeout);
        }
        return (0);
}

/**
 * \brief Encode the object status into the response buffer, which is
 *        expected to contain the current enclosure status.  This function
 *        turns off all the 'select' bits for the objects except for the
 *        object specified, then sends it back to the enclosure.
 *
 * \param enc   SES enclosure the change is being applied to.
 * \param buf   Buffer containing the current enclosure status response.
 * \param amt   Length of the response in the buffer.
 * \param req   The control request to be applied to buf.
 *
 * \return      0 on success, errno otherwise.
 */
static int
ses_encode(enc_softc_t *enc, uint8_t *buf, int amt, ses_control_request_t *req)
{
        struct ses_iterator iter;
        enc_element_t *element;
        int offset;
        struct ses_control_page_hdr *hdr;

        ses_iter_init(enc, &enc->enc_cache, &iter);
        hdr = (struct ses_control_page_hdr *)buf;
        if (req->elm_idx == -1) {
                /* for enclosure status, at least 2 bytes are needed */
                if (amt < 2)
                        return EIO;
                hdr->control_flags =
                    req->elm_stat.comstatus & SES_SET_STATUS_MASK;
                ENC_DLOG(enc, "Set EncStat %x\n", hdr->control_flags);
                return (0);
        }

        element = ses_iter_seek_to(&iter, req->elm_idx, SES_ELEM_INDEX_GLOBAL);
        if (element == NULL)
                return (ENXIO);

        /*
         * Seek to the type set that corresponds to the requested object.
         * The +1 is for the overall status element for the type.
         */
        offset = sizeof(struct ses_control_page_hdr)
               + (iter.global_element_index * sizeof(struct ses_comstat));

        /* Check for buffer overflow. */
        if (offset + sizeof(struct ses_comstat) > amt)
                return (EIO);

        /* Set the status. */
        memcpy(&buf[offset], &req->elm_stat, sizeof(struct ses_comstat));

        ENC_DLOG(enc, "Set Type 0x%x Obj 0x%x (offset %d) with %x %x %x %x\n",
            iter.type_index, iter.global_element_index, offset,
            req->elm_stat.comstatus, req->elm_stat.comstat[0],
            req->elm_stat.comstat[1], req->elm_stat.comstat[2]);

        return (0);
}

static int
ses_fill_control_request(enc_softc_t *enc, struct enc_fsm_state *state,
                         union ccb *ccb, uint8_t *buf)
{
        ses_softc_t                     *ses;
        enc_cache_t                     *enc_cache;
        ses_cache_t                     *ses_cache;
        struct ses_control_page_hdr     *hdr;
        ses_control_request_t           *req;
        size_t                           plength;
        size_t                           offset;

        ses = enc->enc_private;
        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;
        hdr = (struct ses_control_page_hdr *)buf;
        
        if (ses_cache->status_page == NULL) {
                ses_terminate_control_requests(&ses->ses_requests, EIO);
                return (EIO);
        }

        plength = ses_page_length(&ses_cache->status_page->hdr);
        memcpy(buf, ses_cache->status_page, plength);

        /* Disable the select bits in all status entries.  */
        offset = sizeof(struct ses_control_page_hdr);
        for (offset = sizeof(struct ses_control_page_hdr);
             offset < plength; offset += sizeof(struct ses_comstat)) {
                buf[offset] &= ~SESCTL_CSEL;
        }

        /* And make sure the INVOP bit is clear.  */
        hdr->control_flags &= ~SES_ENCSTAT_INVOP;

        /* Apply incoming requests. */
        while ((req = TAILQ_FIRST(&ses->ses_requests)) != NULL) {

                TAILQ_REMOVE(&ses->ses_requests, req, links);
                req->result = ses_encode(enc, buf, plength, req);
                if (req->result != 0) {
                        wakeup(req);
                        continue;
                }
                TAILQ_INSERT_TAIL(&ses->ses_pending_requests, req, links);
        }

        if (TAILQ_EMPTY(&ses->ses_pending_requests) != 0)
                return (ENOENT);

        /* Fill out the ccb */
        if (enc->enc_type == ENC_SEMB_SES) {
                semb_send_diagnostic(&ccb->ataio, /*retries*/5, NULL,
                             MSG_SIMPLE_Q_TAG,
                             buf, ses_page_length(&ses_cache->status_page->hdr),
                             state->timeout);
        } else {
                scsi_send_diagnostic(&ccb->csio, /*retries*/5, NULL,
                             MSG_SIMPLE_Q_TAG, /*unit_offline*/0,
                             /*device_offline*/0, /*self_test*/0,
                             /*page_format*/1, /*self_test_code*/0,
                             buf, ses_page_length(&ses_cache->status_page->hdr),
                             SSD_FULL_SIZE, state->timeout);
        }
        return (0);
}

static int
ses_get_elm_addlstatus_fc(enc_softc_t *enc, enc_cache_t *enc_cache,
                          uint8_t *buf, int bufsiz)
{
        ENC_VLOG(enc, "FC Device Support Stubbed in Additional Status Page\n");
        return (ENODEV);
}

#define SES_PRINT_PORTS(p, type) do {                                   \
        if (((p) & SES_SASOBJ_DEV_PHY_PROTOMASK) != 0) {                \
                sbuf_printf(sbp, " %s (", type);                        \
                if ((p) & SES_SASOBJ_DEV_PHY_SMP)                       \
                        sbuf_printf(sbp, " SMP");                       \
                if ((p) & SES_SASOBJ_DEV_PHY_STP)                       \
                        sbuf_printf(sbp, " STP");                       \
                if ((p) & SES_SASOBJ_DEV_PHY_SSP)                       \
                        sbuf_printf(sbp, " SSP");                       \
                sbuf_printf(sbp, " )");                                 \
        }                                                               \
} while(0)

/**
 * \brief Print the additional element status data for this object, for SAS
 *        type 0 objects.  See SES2 r20 Section 6.1.13.3.2.
 *
 * \param sesname       SES device name associated with the object.
 * \param sbp           Sbuf to print to.
 * \param obj           The object to print the data for.
 */
static void
ses_print_addl_data_sas_type0(char *sesname, struct sbuf *sbp,
                              enc_element_t *obj)
{
        int i;
        ses_element_t *elmpriv;
        struct ses_addl_status *addl;
        struct ses_elm_sas_device_phy *phy;

        elmpriv = obj->elm_private;
        addl = &(elmpriv->addl);
        sbuf_printf(sbp, ", SAS Slot: %d%s phys",
            addl->proto_hdr.sas->base_hdr.num_phys,
            ses_elm_sas_type0_not_all_phys(addl->proto_hdr.sas) ? "+" : "");
        if (ses_elm_addlstatus_eip(addl->hdr))
                sbuf_printf(sbp, " at slot %d",
                    addl->proto_hdr.sas->type0_eip.dev_slot_num);
        sbuf_printf(sbp, "\n");
        if (addl->proto_data.sasdev_phys == NULL)
                return;
        for (i = 0;i < addl->proto_hdr.sas->base_hdr.num_phys;i++) {
                phy = &addl->proto_data.sasdev_phys[i];
                sbuf_printf(sbp, "%s:  phy %d:", sesname, i);
                if (ses_elm_sas_dev_phy_sata_dev(phy))
                        /* Spec says all other fields are specific values */
                        sbuf_printf(sbp, " SATA device\n");
                else {
                        sbuf_printf(sbp, " SAS device type %d phy %d",
                            ses_elm_sas_dev_phy_dev_type(phy), phy->phy_id);
                        SES_PRINT_PORTS(phy->initiator_ports, "Initiator");
                        SES_PRINT_PORTS(phy->target_ports, "Target");
                        sbuf_printf(sbp, "\n");
                }
                sbuf_printf(sbp, "%s:  phy %d: parent %jx addr %jx\n",
                    sesname, i,
                    (uintmax_t)scsi_8btou64(phy->parent_addr),
                    (uintmax_t)scsi_8btou64(phy->phy_addr));
        }
}
#undef SES_PRINT_PORTS

/**
 * \brief Print the additional element status data for this object, for SAS
 *        type 1 objects.  See SES2 r20 Sections 6.1.13.3.3 and 6.1.13.3.4.
 *
 * \param sesname       SES device name associated with the object.
 * \param sbp           Sbuf to print to.
 * \param obj           The object to print the data for.
 */
static void
ses_print_addl_data_sas_type1(char *sesname, struct sbuf *sbp,
                              enc_element_t *obj)
{
        int i, num_phys;
        ses_element_t *elmpriv;
        struct ses_addl_status *addl;
        struct ses_elm_sas_expander_phy *exp_phy;
        struct ses_elm_sas_port_phy *port_phy;

        elmpriv = obj->elm_private;
        addl = &(elmpriv->addl);
        sbuf_printf(sbp, ", SAS ");
        if (obj->elm_type == ELMTYP_SAS_EXP) {
                num_phys = addl->proto_hdr.sas->base_hdr.num_phys;
                sbuf_printf(sbp, "Expander: %d phys", num_phys);
                if (addl->proto_data.sasexp_phys == NULL)
                        return;
                for (i = 0;i < num_phys;i++) {
                        exp_phy = &addl->proto_data.sasexp_phys[i];
                        sbuf_printf(sbp, "%s:  phy %d: connector %d other %d\n",
                            sesname, i, exp_phy->connector_index,
                            exp_phy->other_index);
                }
        } else {
                num_phys = addl->proto_hdr.sas->base_hdr.num_phys;
                sbuf_printf(sbp, "Port: %d phys", num_phys);
                if (addl->proto_data.sasport_phys == NULL)
                        return;
                for (i = 0;i < num_phys;i++) {
                        port_phy = &addl->proto_data.sasport_phys[i];
                        sbuf_printf(sbp,
                            "%s:  phy %d: id %d connector %d other %d\n",
                            sesname, i, port_phy->phy_id,
                            port_phy->connector_index, port_phy->other_index);
                        sbuf_printf(sbp, "%s:  phy %d: addr %jx\n", sesname, i,
                            (uintmax_t)scsi_8btou64(port_phy->phy_addr));
                }
        }
}

/**
 * \brief Print the additional element status data for this object, for
 *        ATA objects.
 *
 * \param sbp           Sbuf to print to.
 * \param obj           The object to print the data for.
 */
static void
ses_print_addl_data_ata(struct sbuf *sbp, enc_element_t *obj)
{
        ses_element_t *elmpriv = obj->elm_private;
        struct ses_addl_status *addl = &elmpriv->addl;
        struct ses_elm_ata_hdr *ata = addl->proto_hdr.ata;

        sbuf_printf(sbp, ", SATA Slot: scbus%d target %d\n",
            scsi_4btoul(ata->bus), scsi_4btoul(ata->target));
}

/**
 * \brief Print the additional element status data for this object.
 *
 * \param enc           SES softc associated with the object.
 * \param obj           The object to print the data for.
 */
static void
ses_print_addl_data(enc_softc_t *enc, enc_element_t *obj)
{
        ses_element_t *elmpriv;
        struct ses_addl_status *addl;
        struct sbuf sesname, name, out;

        elmpriv = obj->elm_private;
        if (elmpriv == NULL)
                return;

        addl = &(elmpriv->addl);
        if (addl->hdr == NULL)
                return;

        sbuf_new(&sesname, NULL, 16, SBUF_AUTOEXTEND);
        sbuf_new(&name, NULL, 16, SBUF_AUTOEXTEND);
        sbuf_new(&out, NULL, 512, SBUF_AUTOEXTEND);
        ses_paths_iter(enc, obj, ses_elmdevname_callback, &name);
        if (sbuf_len(&name) == 0)
                sbuf_printf(&name, "(none)");
        sbuf_finish(&name);
        sbuf_printf(&sesname, "%s%d", enc->periph->periph_name,
            enc->periph->unit_number);
        sbuf_finish(&sesname);
        sbuf_printf(&out, "%s: %s in ", sbuf_data(&sesname), sbuf_data(&name));
        if (elmpriv->descr != NULL)
                sbuf_printf(&out, "'%s'", elmpriv->descr);
        else {
                if (obj->elm_type <= ELMTYP_LAST)
                        sbuf_cat(&out, elm_type_names[obj->elm_type]);
                else
                        sbuf_printf(&out, "<Type 0x%02x>", obj->elm_type);
                sbuf_printf(&out, " %d", obj->type_elm_idx);
                if (obj->subenclosure != 0)
                        sbuf_printf(&out, " of subenc %d", obj->subenclosure);
        }
        switch(ses_elm_addlstatus_proto(addl->hdr)) {
        case SPSP_PROTO_FC:
                goto noaddl;    /* stubbed for now */
        case SPSP_PROTO_SAS:
                if (addl->proto_hdr.sas == NULL)
                        goto noaddl;
                switch(ses_elm_sas_descr_type(addl->proto_hdr.sas)) {
                case SES_SASOBJ_TYPE_SLOT:
                        ses_print_addl_data_sas_type0(sbuf_data(&sesname),
                            &out, obj);
                        break;
                case SES_SASOBJ_TYPE_OTHER:
                        ses_print_addl_data_sas_type1(sbuf_data(&sesname),
                            &out, obj);
                        break;
                default:
                        goto noaddl;
                }
                break;
        case SPSP_PROTO_ATA:
                if (addl->proto_hdr.ata == NULL)
                        goto noaddl;
                ses_print_addl_data_ata(&out, obj);
                break;
        default:
noaddl:
                sbuf_cat(&out, "\n");
                break;
        }
        sbuf_finish(&out);
        printf("%s", sbuf_data(&out));
        sbuf_delete(&out);
        sbuf_delete(&name);
        sbuf_delete(&sesname);
}

/**
 * \brief Update the softc with the additional element status data for this
 *        object, for SAS type 0 objects.
 *
 * \param enc           SES softc to be updated.
 * \param buf           The additional element status response buffer.
 * \param bufsiz        Size of the response buffer.
 * \param eip           The EIP bit value.
 * \param nobj          Number of objects attached to the SES softc.
 * 
 * \return              0 on success, errno otherwise.
 */
static int
ses_get_elm_addlstatus_sas_type0(enc_softc_t *enc, enc_cache_t *enc_cache,
                                 uint8_t *buf, int bufsiz, int eip, int nobj)
{
        int err, offset, physz;
        enc_element_t *obj;
        ses_element_t *elmpriv;
        struct ses_addl_status *addl;

        err = offset = 0;

        /* basic object setup */
        obj = &(enc_cache->elm_map[nobj]);
        elmpriv = obj->elm_private;
        addl = &(elmpriv->addl);

        addl->proto_hdr.sas = (union ses_elm_sas_hdr *)&buf[offset];

        /* Don't assume this object has any phys */
        bzero(&addl->proto_data, sizeof(addl->proto_data));
        if (addl->proto_hdr.sas->base_hdr.num_phys == 0)
                goto out;

        /* Skip forward to the phy list */
        if (eip)
                offset += sizeof(struct ses_elm_sas_type0_eip_hdr);
        else
                offset += sizeof(struct ses_elm_sas_type0_base_hdr);

        /* Make sure the phy list fits in the buffer */
        physz = addl->proto_hdr.sas->base_hdr.num_phys;
        physz *= sizeof(struct ses_elm_sas_device_phy);
        if (physz > (bufsiz - offset + 4)) {
                ENC_VLOG(enc, "Element %d Device Phy List Beyond End Of Buffer\n",
                    nobj);
                err = EIO;
                goto out;
        }

        /* Point to the phy list */
        addl->proto_data.sasdev_phys =
            (struct ses_elm_sas_device_phy *)&buf[offset];

out:
        return (err);
}

/**
 * \brief Update the softc with the additional element status data for this
 *        object, for SAS type 1 objects.
 *
 * \param enc           SES softc to be updated.
 * \param buf           The additional element status response buffer.
 * \param bufsiz        Size of the response buffer.
 * \param eip           The EIP bit value.
 * \param nobj          Number of objects attached to the SES softc.
 * 
 * \return              0 on success, errno otherwise.
 */
static int
ses_get_elm_addlstatus_sas_type1(enc_softc_t *enc, enc_cache_t *enc_cache,
                                 uint8_t *buf, int bufsiz, int eip, int nobj)
{
        int err, offset, physz;
        enc_element_t *obj;
        ses_element_t *elmpriv;
        struct ses_addl_status *addl;

        err = offset = 0;

        /* basic object setup */
        obj = &(enc_cache->elm_map[nobj]);
        elmpriv = obj->elm_private;
        addl = &(elmpriv->addl);

        addl->proto_hdr.sas = (union ses_elm_sas_hdr *)&buf[offset];

        /* Don't assume this object has any phys */
        bzero(&addl->proto_data, sizeof(addl->proto_data));
        if (addl->proto_hdr.sas->base_hdr.num_phys == 0)
                goto out;

        /* Process expanders differently from other type1 cases */
        if (obj->elm_type == ELMTYP_SAS_EXP) {
                offset += sizeof(struct ses_elm_sas_type1_expander_hdr);
                physz = addl->proto_hdr.sas->base_hdr.num_phys *
                    sizeof(struct ses_elm_sas_expander_phy);
                if (physz > (bufsiz - offset)) {
                        ENC_VLOG(enc, "Element %d: Expander Phy List Beyond "
                            "End Of Buffer\n", nobj);
                        err = EIO;
                        goto out;
                }
                addl->proto_data.sasexp_phys =
                    (struct ses_elm_sas_expander_phy *)&buf[offset];
        } else {
                offset += sizeof(struct ses_elm_sas_type1_nonexpander_hdr);
                physz = addl->proto_hdr.sas->base_hdr.num_phys *
                    sizeof(struct ses_elm_sas_port_phy);
                if (physz > (bufsiz - offset + 4)) {
                        ENC_VLOG(enc, "Element %d: Port Phy List Beyond End "
                            "Of Buffer\n", nobj);
                        err = EIO;
                        goto out;
                }
                addl->proto_data.sasport_phys =
                    (struct ses_elm_sas_port_phy *)&buf[offset];
        }

out:
        return (err);
}

/**
 * \brief Update the softc with the additional element status data for this
 *        object, for SAS objects.
 *
 * \param enc           SES softc to be updated.
 * \param buf           The additional element status response buffer.
 * \param bufsiz        Size of the response buffer.
 * \param eip           The EIP bit value.
 * \param tidx          Type index for this object.
 * \param nobj          Number of objects attached to the SES softc.
 * 
 * \return              0 on success, errno otherwise.
 */
static int
ses_get_elm_addlstatus_sas(enc_softc_t *enc, enc_cache_t *enc_cache,
                           uint8_t *buf, int bufsiz, int eip, int tidx,
                           int nobj)
{
        int dtype, err;
        ses_cache_t *ses_cache;
        union ses_elm_sas_hdr *hdr;

        /* Need to be able to read the descriptor type! */
        if (bufsiz < sizeof(union ses_elm_sas_hdr)) {
                err = EIO;
                goto out;
        }

        ses_cache = enc_cache->private;

        hdr = (union ses_elm_sas_hdr *)buf;
        dtype = ses_elm_sas_descr_type(hdr);
        switch(dtype) {
        case SES_SASOBJ_TYPE_SLOT:
                switch(ses_cache->ses_types[tidx].hdr->etype_elm_type) {
                case ELMTYP_DEVICE:
                case ELMTYP_ARRAY_DEV:
                        break;
                default:
                        ENC_VLOG(enc, "Element %d has Additional Status type 0, "
                            "invalid for SES element type 0x%x\n", nobj,
                            ses_cache->ses_types[tidx].hdr->etype_elm_type);
                        err = ENODEV;
                        goto out;
                }
                err = ses_get_elm_addlstatus_sas_type0(enc, enc_cache,
                                                       buf, bufsiz, eip,
                    nobj);
                break;
        case SES_SASOBJ_TYPE_OTHER:
                switch(ses_cache->ses_types[tidx].hdr->etype_elm_type) {
                case ELMTYP_SAS_EXP:
                case ELMTYP_SCSI_INI:
                case ELMTYP_SCSI_TGT:
                case ELMTYP_ESCC:
                        break;
                default:
                        ENC_VLOG(enc, "Element %d has Additional Status type 1, "
                            "invalid for SES element type 0x%x\n", nobj,
                            ses_cache->ses_types[tidx].hdr->etype_elm_type);
                        err = ENODEV;
                        goto out;
                }
                err = ses_get_elm_addlstatus_sas_type1(enc, enc_cache, buf,
                                                       bufsiz, eip, nobj);
                break;
        default:
                ENC_VLOG(enc, "Element %d of type 0x%x has Additional Status "
                    "of unknown type 0x%x\n", nobj,
                    ses_cache->ses_types[tidx].hdr->etype_elm_type, dtype);
                err = ENODEV;
                break;
        }

out:
        return (err);
}

/**
 * \brief Update the softc with the additional element status data for this
 *        object, for ATA objects.
 *
 * \param enc           SES softc to be updated.
 * \param buf           The additional element status response buffer.
 * \param bufsiz        Size of the response buffer.
 * \param eip           The EIP bit value.
 * \param tidx          Type index for this object.
 * \param nobj          Number of objects attached to the SES softc.
 * 
 * \return              0 on success, errno otherwise.
 */
static int
ses_get_elm_addlstatus_ata(enc_softc_t *enc, enc_cache_t *enc_cache,
                           uint8_t *buf, int bufsiz, int eip, int tidx,
                           int nobj)
{
        int err;
        ses_cache_t *ses_cache;

        if (bufsiz < sizeof(struct ses_elm_ata_hdr)) {
                err = EIO;
                goto out;
        }

        ses_cache = enc_cache->private;
        switch(ses_cache->ses_types[tidx].hdr->etype_elm_type) {
        case ELMTYP_DEVICE:
        case ELMTYP_ARRAY_DEV:
                break;
        default:
                ENC_VLOG(enc, "Element %d has Additional Status, "
                    "invalid for SES element type 0x%x\n", nobj,
                    ses_cache->ses_types[tidx].hdr->etype_elm_type);
                err = ENODEV;
                goto out;
        }

        ((ses_element_t *)enc_cache->elm_map[nobj].elm_private)
            ->addl.proto_hdr.ata = (struct ses_elm_ata_hdr *)buf;
        err = 0;

out:
        return (err);
}

static void
ses_softc_invalidate(enc_softc_t *enc)
{
        ses_softc_t *ses;

        ses = enc->enc_private;
        ses_terminate_control_requests(&ses->ses_requests, ENXIO);
}

static void
ses_softc_cleanup(enc_softc_t *enc)
{

        ses_cache_free(enc, &enc->enc_cache);
        ses_cache_free(enc, &enc->enc_daemon_cache);
        ENC_FREE_AND_NULL(enc->enc_private);
        ENC_FREE_AND_NULL(enc->enc_cache.private);
        ENC_FREE_AND_NULL(enc->enc_daemon_cache.private);
}

static int
ses_init_enc(enc_softc_t *enc)
{
        return (0);
}

static int
ses_get_enc_status(enc_softc_t *enc, int slpflag)
{
        /* Automatically updated, caller checks enc_cache->encstat itself */
        return (0);
}

static int
ses_set_enc_status(enc_softc_t *enc, uint8_t encstat, int slpflag)
{
        ses_control_request_t req;
        ses_softc_t          *ses;

        ses = enc->enc_private;
        req.elm_idx = SES_SETSTATUS_ENC_IDX;
        req.elm_stat.comstatus = encstat & 0xf;
        
        TAILQ_INSERT_TAIL(&ses->ses_requests, &req, links);
        enc_update_request(enc, SES_PROCESS_CONTROL_REQS);
        cam_periph_sleep(enc->periph, &req, PUSER, "encstat", 0);

        return (req.result);
}

static int
ses_get_elm_status(enc_softc_t *enc, encioc_elm_status_t *elms, int slpflag)
{
        unsigned int i = elms->elm_idx;

        memcpy(elms->cstat, &enc->enc_cache.elm_map[i].encstat, 4);
        return (0);
}

static int
ses_set_elm_status(enc_softc_t *enc, encioc_elm_status_t *elms, int slpflag)
{
        ses_control_request_t req;
        ses_softc_t          *ses;

        /* If this is clear, we don't do diddly.  */
        if ((elms->cstat[0] & SESCTL_CSEL) == 0)
                return (0);

        ses = enc->enc_private;
        req.elm_idx = elms->elm_idx;
        memcpy(&req.elm_stat, elms->cstat, sizeof(req.elm_stat));

        TAILQ_INSERT_TAIL(&ses->ses_requests, &req, links);
        enc_update_request(enc, SES_PROCESS_CONTROL_REQS);
        cam_periph_sleep(enc->periph, &req, PUSER, "encstat", 0);

        return (req.result);
}

static int
ses_get_elm_desc(enc_softc_t *enc, encioc_elm_desc_t *elmd)
{
        int i = (int)elmd->elm_idx;
        ses_element_t *elmpriv;

        /* Assume caller has already checked obj_id validity */
        elmpriv = enc->enc_cache.elm_map[i].elm_private;
        /* object might not have a descriptor */
        if (elmpriv == NULL || elmpriv->descr == NULL) {
                elmd->elm_desc_len = 0;
                return (0);
        }
        if (elmd->elm_desc_len > elmpriv->descr_len)
                elmd->elm_desc_len = elmpriv->descr_len;
        copyout(elmpriv->descr, elmd->elm_desc_str, elmd->elm_desc_len);
        return (0);
}

/**
 * \brief Respond to ENCIOC_GETELMDEVNAME, providing a device name for the
 *        given object id if one is available.
 *
 * \param enc   SES softc to examine.
 * \param objdn ioctl structure to read/write device name info.
 *
 * \return      0 on success, errno otherwise.
 */
static int
ses_get_elm_devnames(enc_softc_t *enc, encioc_elm_devnames_t *elmdn)
{
        struct sbuf sb;
        int len;

        len = elmdn->elm_names_size;
        if (len < 0)
                return (EINVAL);

        cam_periph_unlock(enc->periph);
        sbuf_new(&sb, NULL, len, SBUF_FIXEDLEN);
        ses_paths_iter(enc, &enc->enc_cache.elm_map[elmdn->elm_idx],
            ses_elmdevname_callback, &sb);
        sbuf_finish(&sb);
        elmdn->elm_names_len = sbuf_len(&sb);
        copyout(sbuf_data(&sb), elmdn->elm_devnames, elmdn->elm_names_len + 1);
        sbuf_delete(&sb);
        cam_periph_lock(enc->periph);
        return (elmdn->elm_names_len > 0 ? 0 : ENODEV);
}

/**
 * \brief Send a string to the primary subenclosure using the String Out
 *        SES diagnostic page.
 *
 * \param enc   SES enclosure to run the command on.
 * \param sstr  SES string structure to operate on
 * \param ioc   Ioctl being performed
 *
 * \return      0 on success, errno otherwise.
 */
static int
ses_handle_string(enc_softc_t *enc, encioc_string_t *sstr, int ioc)
{
        ses_softc_t *ses;
        enc_cache_t *enc_cache;
        ses_cache_t *ses_cache;
        const struct ses_enc_desc *enc_desc;
        int amt, payload, ret;
        char cdb[6];
        char str[32];
        char vendor[9];
        char product[17];
        char rev[5];
        uint8_t *buf;
        size_t size, rsize;

        ses = enc->enc_private;
        enc_cache = &enc->enc_daemon_cache;
        ses_cache = enc_cache->private;

        /* Implement SES2r20 6.1.6 */
        if (sstr->bufsiz > 0xffff)
                return (EINVAL); /* buffer size too large */

        switch (ioc) {
        case ENCIOC_SETSTRING:
                payload = sstr->bufsiz + 4; /* header for SEND DIAGNOSTIC */
                amt = 0 - payload;
                buf = ENC_MALLOC(payload);
                if (buf == NULL)
                        return (ENOMEM);
                ses_page_cdb(cdb, payload, 0, CAM_DIR_OUT);
                /* Construct the page request */
                buf[0] = SesStringOut;
                buf[1] = 0;
                buf[2] = sstr->bufsiz >> 8;
                buf[3] = sstr->bufsiz & 0xff;
                memcpy(&buf[4], sstr->buf, sstr->bufsiz);
                break;
        case ENCIOC_GETSTRING:
                payload = sstr->bufsiz;
                amt = payload;
                ses_page_cdb(cdb, payload, SesStringIn, CAM_DIR_IN);
                buf = sstr->buf;
                break;
        case ENCIOC_GETENCNAME:
                if (ses_cache->ses_nsubencs < 1)
                        return (ENODEV);
                enc_desc = ses_cache->subencs[0];
                cam_strvis(vendor, enc_desc->vendor_id,
                    sizeof(enc_desc->vendor_id), sizeof(vendor));
                cam_strvis(product, enc_desc->product_id,
                    sizeof(enc_desc->product_id), sizeof(product));
                cam_strvis(rev, enc_desc->product_rev,
                    sizeof(enc_desc->product_rev), sizeof(rev));
                rsize = snprintf(str, sizeof(str), "%s %s %s",
                    vendor, product, rev) + 1;
                if (rsize > sizeof(str))
                        rsize = sizeof(str);
                copyout(&rsize, &sstr->bufsiz, sizeof(rsize));
                size = rsize;
                if (size > sstr->bufsiz)
                        size = sstr->bufsiz;
                copyout(str, sstr->buf, size);
                return (size == rsize ? 0 : ENOMEM);
        case ENCIOC_GETENCID:
                if (ses_cache->ses_nsubencs < 1)
                        return (ENODEV);
                enc_desc = ses_cache->subencs[0];
                rsize = snprintf(str, sizeof(str), "%16jx",
                    scsi_8btou64(enc_desc->logical_id)) + 1;
                if (rsize > sizeof(str))
                        rsize = sizeof(str);
                copyout(&rsize, &sstr->bufsiz, sizeof(rsize));
                size = rsize;
                if (size > sstr->bufsiz)
                        size = sstr->bufsiz;
                copyout(str, sstr->buf, size);
                return (size == rsize ? 0 : ENOMEM);
        default:
                return (EINVAL);
        }
        ret = enc_runcmd(enc, cdb, 6, buf, &amt);
        if (ioc == ENCIOC_SETSTRING)
                ENC_FREE(buf);
        return (ret);
}

/**
 * \invariant Called with cam_periph mutex held.
 */
static void
ses_poll_status(enc_softc_t *enc)
{
        ses_softc_t *ses;

        ses = enc->enc_private;
        enc_update_request(enc, SES_UPDATE_GETSTATUS);
        if (ses->ses_flags & SES_FLAG_DESC)
                enc_update_request(enc, SES_UPDATE_GETELMDESCS);
        if (ses->ses_flags & SES_FLAG_ADDLSTATUS)
                enc_update_request(enc, SES_UPDATE_GETELMADDLSTATUS);
}

/**
 * \brief Notification received when CAM detects a new device in the
 *        SCSI domain in which this SEP resides.
 *
 * \param enc   SES enclosure instance.
 */
static void
ses_device_found(enc_softc_t *enc)
{
        ses_poll_status(enc);
        enc_update_request(enc, SES_PUBLISH_PHYSPATHS);
}

static struct enc_vec ses_enc_vec =
{
        .softc_invalidate       = ses_softc_invalidate,
        .softc_cleanup          = ses_softc_cleanup,
        .init_enc               = ses_init_enc,
        .get_enc_status         = ses_get_enc_status,
        .set_enc_status         = ses_set_enc_status,
        .get_elm_status         = ses_get_elm_status,
        .set_elm_status         = ses_set_elm_status,
        .get_elm_desc           = ses_get_elm_desc,
        .get_elm_devnames       = ses_get_elm_devnames,
        .handle_string          = ses_handle_string,
        .device_found           = ses_device_found,
        .poll_status            = ses_poll_status
};

/**
 * \brief Initialize a new SES instance.
 *
 * \param enc           SES softc structure to set up the instance in.
 * \param doinit        Do the initialization (see main driver).
 *
 * \return              0 on success, errno otherwise.
 */
int
ses_softc_init(enc_softc_t *enc)
{
        ses_softc_t *ses_softc;

        CAM_DEBUG(enc->periph->path, CAM_DEBUG_SUBTRACE,
            ("entering enc_softc_init(%p)\n", enc));

        enc->enc_vec = ses_enc_vec;
        enc->enc_fsm_states = enc_fsm_states;

        if (enc->enc_private == NULL)
                enc->enc_private = ENC_MALLOCZ(sizeof(ses_softc_t));
        if (enc->enc_cache.private == NULL)
                enc->enc_cache.private = ENC_MALLOCZ(sizeof(ses_cache_t));
        if (enc->enc_daemon_cache.private == NULL)
                enc->enc_daemon_cache.private =
                     ENC_MALLOCZ(sizeof(ses_cache_t));

        if (enc->enc_private == NULL
         || enc->enc_cache.private == NULL
         || enc->enc_daemon_cache.private == NULL) {
                ENC_FREE_AND_NULL(enc->enc_private);
                ENC_FREE_AND_NULL(enc->enc_cache.private);
                ENC_FREE_AND_NULL(enc->enc_daemon_cache.private);
                return (ENOMEM);
        }

        ses_softc = enc->enc_private;
        TAILQ_INIT(&ses_softc->ses_requests);
        TAILQ_INIT(&ses_softc->ses_pending_requests);

        enc_update_request(enc, SES_UPDATE_PAGES);

        // XXX: Move this to the FSM so it doesn't hang init
        if (0) (void) ses_set_timed_completion(enc, 1);

        return (0);
}