FreeBSD/Linux Kernel Cross Reference
sys/dev/mps/mps_mapping.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011-2015 LSI Corp.
      * Copyright (c) 2013-2015 Avago Technologies
      * 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.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * 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.
     *
     * Avago Technologies (LSI) MPT-Fusion Host Adapter FreeBSD
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/dev/mps/mps_mapping.c 328218 2018-01-21 15:42:36Z pfg $");
    
    /* TODO Move headers to mpsvar */
    #include <sys/types.h>
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/kthread.h>
    #include <sys/taskqueue.h>
    #include <sys/bus.h>
    #include <sys/endian.h>
    #include <sys/sysctl.h>
    #include <sys/sbuf.h>
    #include <sys/eventhandler.h>
    #include <sys/uio.h>
    #include <machine/bus.h>
    #include <machine/resource.h>
    #include <dev/mps/mpi/mpi2_type.h>
    #include <dev/mps/mpi/mpi2.h>
    #include <dev/mps/mpi/mpi2_ioc.h>
    #include <dev/mps/mpi/mpi2_sas.h>
    #include <dev/mps/mpi/mpi2_cnfg.h>
    #include <dev/mps/mpi/mpi2_init.h>
    #include <dev/mps/mpi/mpi2_tool.h>
    #include <dev/mps/mps_ioctl.h>
    #include <dev/mps/mpsvar.h>
    #include <dev/mps/mps_mapping.h>
    
    /**
     * _mapping_clear_map_entry - Clear a particular mapping entry.
     * @map_entry: map table entry
     *
     * Returns nothing.
     */
    static inline void
    _mapping_clear_map_entry(struct dev_mapping_table *map_entry)
    {
            map_entry->physical_id = 0;
            map_entry->device_info = 0;
            map_entry->phy_bits = 0;
            map_entry->dpm_entry_num = MPS_DPM_BAD_IDX;
            map_entry->dev_handle = 0;
            map_entry->id = -1;
            map_entry->missing_count = 0;
            map_entry->init_complete = 0;
            map_entry->TLR_bits = (u8)MPI2_SCSIIO_CONTROL_NO_TLR;
    }
    
    /**
     * _mapping_clear_enc_entry - Clear a particular enclosure table entry.
     * @enc_entry: enclosure table entry
     *
     * Returns nothing.
     */
    static inline void
    _mapping_clear_enc_entry(struct enc_mapping_table *enc_entry)
    {
            enc_entry->enclosure_id = 0;
            enc_entry->start_index = MPS_MAPTABLE_BAD_IDX;
            enc_entry->phy_bits = 0;
            enc_entry->dpm_entry_num = MPS_DPM_BAD_IDX;
            enc_entry->enc_handle = 0;
            enc_entry->num_slots = 0;
            enc_entry->start_slot = 0;
           enc_entry->missing_count = 0;
           enc_entry->removal_flag = 0;
           enc_entry->skip_search = 0;
           enc_entry->init_complete = 0;
   }
   
   /**
    * _mapping_commit_enc_entry - write a particular enc entry in DPM page0.
    * @sc: per adapter object
    * @enc_entry: enclosure table entry
    *
    * Returns 0 for success, non-zero for failure.
    */
   static int
   _mapping_commit_enc_entry(struct mps_softc *sc,
       struct enc_mapping_table *et_entry)
   {
           Mpi2DriverMap0Entry_t *dpm_entry;
           struct dev_mapping_table *mt_entry;
           Mpi2ConfigReply_t mpi_reply;
           Mpi2DriverMappingPage0_t config_page;
   
           if (!sc->is_dpm_enable)
                   return 0;
   
           memset(&config_page, 0, sizeof(Mpi2DriverMappingPage0_t));
           memcpy(&config_page.Header, (u8 *) sc->dpm_pg0,
               sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
           dpm_entry = (Mpi2DriverMap0Entry_t *)((u8 *)sc->dpm_pg0 +
               sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
           dpm_entry += et_entry->dpm_entry_num;
           dpm_entry->PhysicalIdentifier.Low =
               ( 0xFFFFFFFF & et_entry->enclosure_id);
           dpm_entry->PhysicalIdentifier.High =
               ( et_entry->enclosure_id >> 32);
           mt_entry = &sc->mapping_table[et_entry->start_index];
           dpm_entry->DeviceIndex = htole16(mt_entry->id);
           dpm_entry->MappingInformation = et_entry->num_slots;
           dpm_entry->MappingInformation <<= MPI2_DRVMAP0_MAPINFO_SLOT_SHIFT;
           dpm_entry->MappingInformation |= et_entry->missing_count;
           dpm_entry->MappingInformation = htole16(dpm_entry->MappingInformation);
           dpm_entry->PhysicalBitsMapping = htole32(et_entry->phy_bits);
           dpm_entry->Reserved1 = 0;
   
           mps_dprint(sc, MPS_MAPPING, "%s: Writing DPM entry %d for enclosure.\n",
               __func__, et_entry->dpm_entry_num);
           memcpy(&config_page.Entry, (u8 *)dpm_entry,
               sizeof(Mpi2DriverMap0Entry_t));
           if (mps_config_set_dpm_pg0(sc, &mpi_reply, &config_page,
               et_entry->dpm_entry_num)) {
                   mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: Write of DPM "
                       "entry %d for enclosure failed.\n", __func__,
                       et_entry->dpm_entry_num);
                   dpm_entry->MappingInformation = le16toh(dpm_entry->
                       MappingInformation);
                   dpm_entry->DeviceIndex = le16toh(dpm_entry->DeviceIndex);
                   dpm_entry->PhysicalBitsMapping =
                       le32toh(dpm_entry->PhysicalBitsMapping);
                   return -1;
           }
           dpm_entry->MappingInformation = le16toh(dpm_entry->
               MappingInformation);
           dpm_entry->DeviceIndex = le16toh(dpm_entry->DeviceIndex);
           dpm_entry->PhysicalBitsMapping =
               le32toh(dpm_entry->PhysicalBitsMapping);
           return 0;
   }
   
   /**
    * _mapping_commit_map_entry - write a particular map table entry in DPM page0.
    * @sc: per adapter object
    * @mt_entry: mapping table entry
    *
    * Returns 0 for success, non-zero for failure.
    */
   
   static int
   _mapping_commit_map_entry(struct mps_softc *sc,
       struct dev_mapping_table *mt_entry)
   {
           Mpi2DriverMap0Entry_t *dpm_entry;
           Mpi2ConfigReply_t mpi_reply;
           Mpi2DriverMappingPage0_t config_page;
   
           if (!sc->is_dpm_enable)
                   return 0;
   
           /*
            * It's possible that this Map Entry points to a BAD DPM index. This
            * can happen if the Map Entry is a for a missing device and the DPM
            * entry that was being used by this device is now being used by some
            * new device. So, check for a BAD DPM index and just return if so.
            */
           if (mt_entry->dpm_entry_num == MPS_DPM_BAD_IDX) {
                   mps_dprint(sc, MPS_MAPPING, "%s: DPM entry location for target "
                       "%d is invalid. DPM will not be written.\n", __func__,
                       mt_entry->id);
                   return 0;
           }
   
           memset(&config_page, 0, sizeof(Mpi2DriverMappingPage0_t));
           memcpy(&config_page.Header, (u8 *)sc->dpm_pg0,
               sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
           dpm_entry = (Mpi2DriverMap0Entry_t *)((u8 *) sc->dpm_pg0 +
               sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
           dpm_entry = dpm_entry + mt_entry->dpm_entry_num;
           dpm_entry->PhysicalIdentifier.Low = (0xFFFFFFFF &
               mt_entry->physical_id);
           dpm_entry->PhysicalIdentifier.High = (mt_entry->physical_id >> 32);
           dpm_entry->DeviceIndex = htole16(mt_entry->id);
           dpm_entry->MappingInformation = htole16(mt_entry->missing_count);
           dpm_entry->PhysicalBitsMapping = 0;
           dpm_entry->Reserved1 = 0;
           memcpy(&config_page.Entry, (u8 *)dpm_entry,
               sizeof(Mpi2DriverMap0Entry_t));
   
           mps_dprint(sc, MPS_MAPPING, "%s: Writing DPM entry %d for target %d.\n",
               __func__, mt_entry->dpm_entry_num, mt_entry->id);
           if (mps_config_set_dpm_pg0(sc, &mpi_reply, &config_page,
               mt_entry->dpm_entry_num)) {
                   mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: Write of DPM "
                       "entry %d for target %d failed.\n", __func__,
                       mt_entry->dpm_entry_num, mt_entry->id);
                   dpm_entry->MappingInformation = le16toh(dpm_entry->
                       MappingInformation);
                   dpm_entry->DeviceIndex = le16toh(dpm_entry->DeviceIndex);
                   return -1;
           }
   
           dpm_entry->MappingInformation = le16toh(dpm_entry->MappingInformation);
           dpm_entry->DeviceIndex = le16toh(dpm_entry->DeviceIndex);
           return 0;
   }
   
   /**
    * _mapping_get_ir_maprange - get start and end index for IR map range.
    * @sc: per adapter object
    * @start_idx: place holder for start index
    * @end_idx: place holder for end index
    *
    * The IR volumes can be mapped either at start or end of the mapping table
    * this function gets the detail of where IR volume mapping starts and ends
    * in the device mapping table
    *
    * Returns nothing.
    */
   static void
   _mapping_get_ir_maprange(struct mps_softc *sc, u32 *start_idx, u32 *end_idx)
   {
           u16 volume_mapping_flags;
           u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
   
           volume_mapping_flags = le16toh(sc->ioc_pg8.IRVolumeMappingFlags) &
               MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
           if (volume_mapping_flags == MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING) {
                   *start_idx = 0;
                   if (ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_RESERVED_TARGETID_0)
                           *start_idx = 1;
           } else
                   *start_idx = sc->max_devices - sc->max_volumes;
           *end_idx = *start_idx + sc->max_volumes - 1;
   }
   
   /**
    * _mapping_get_enc_idx_from_id - get enclosure index from enclosure ID
    * @sc: per adapter object
    * @enc_id: enclosure logical identifier
    *
    * Returns the index of enclosure entry on success or bad index.
    */
   static u8
   _mapping_get_enc_idx_from_id(struct mps_softc *sc, u64 enc_id,
       u64 phy_bits)
   {
           struct enc_mapping_table *et_entry;
           u8 enc_idx = 0;
   
           for (enc_idx = 0; enc_idx < sc->num_enc_table_entries; enc_idx++) {
                   et_entry = &sc->enclosure_table[enc_idx];
                   if ((et_entry->enclosure_id == le64toh(enc_id)) &&
                       (!et_entry->phy_bits || (et_entry->phy_bits &
                       le32toh(phy_bits))))
                           return enc_idx;
           }
           return MPS_ENCTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_enc_idx_from_handle - get enclosure index from handle
    * @sc: per adapter object
    * @enc_id: enclosure handle
    *
    * Returns the index of enclosure entry on success or bad index.
    */
   static u8
   _mapping_get_enc_idx_from_handle(struct mps_softc *sc, u16 handle)
   {
           struct enc_mapping_table *et_entry;
           u8 enc_idx = 0;
   
           for (enc_idx = 0; enc_idx < sc->num_enc_table_entries; enc_idx++) {
                   et_entry = &sc->enclosure_table[enc_idx];
                   if (et_entry->missing_count)
                           continue;
                   if (et_entry->enc_handle == handle)
                           return enc_idx;
           }
           return MPS_ENCTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_high_missing_et_idx - get missing enclosure index
    * @sc: per adapter object
    *
    * Search through the enclosure table and identifies the enclosure entry
    * with high missing count and returns it's index
    *
    * Returns the index of enclosure entry on success or bad index.
    */
   static u8
   _mapping_get_high_missing_et_idx(struct mps_softc *sc)
   {
           struct enc_mapping_table *et_entry;
           u8 high_missing_count = 0;
           u8 enc_idx, high_idx = MPS_ENCTABLE_BAD_IDX;
   
           for (enc_idx = 0; enc_idx < sc->num_enc_table_entries; enc_idx++) {
                   et_entry = &sc->enclosure_table[enc_idx];
                   if ((et_entry->missing_count > high_missing_count) &&
                       !et_entry->skip_search) {
                           high_missing_count = et_entry->missing_count;
                           high_idx = enc_idx;
                   }
           }
           return high_idx;
   }
   
   /**
    * _mapping_get_high_missing_mt_idx - get missing map table index
    * @sc: per adapter object
    *
    * Search through the map table and identifies the device entry
    * with high missing count and returns it's index
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_high_missing_mt_idx(struct mps_softc *sc)
   {
           u32 map_idx, high_idx = MPS_MAPTABLE_BAD_IDX;
           u8 high_missing_count = 0;
           u32 start_idx, end_idx, start_idx_ir, end_idx_ir;
           struct dev_mapping_table *mt_entry;
           u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
   
           start_idx = 0;
           start_idx_ir = 0;
           end_idx_ir = 0;
           end_idx = sc->max_devices;
           if (ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_RESERVED_TARGETID_0)
                   start_idx = 1;
           if (sc->ir_firmware) {
                   _mapping_get_ir_maprange(sc, &start_idx_ir, &end_idx_ir);
                   if (start_idx == start_idx_ir)
                           start_idx = end_idx_ir + 1;
                   else
                           end_idx = start_idx_ir;
           }
           mt_entry = &sc->mapping_table[start_idx];
           for (map_idx = start_idx; map_idx < end_idx; map_idx++, mt_entry++) {
                   if (mt_entry->missing_count > high_missing_count) {
                           high_missing_count =  mt_entry->missing_count;
                           high_idx = map_idx;
                   }
           }
           return high_idx;
   }
   
   /**
    * _mapping_get_ir_mt_idx_from_wwid - get map table index from volume WWID
    * @sc: per adapter object
    * @wwid: world wide unique ID of the volume
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_ir_mt_idx_from_wwid(struct mps_softc *sc, u64 wwid)
   {
           u32 start_idx, end_idx, map_idx;
           struct dev_mapping_table *mt_entry;
   
           _mapping_get_ir_maprange(sc, &start_idx, &end_idx);
           mt_entry = &sc->mapping_table[start_idx];
           for (map_idx = start_idx; map_idx <= end_idx; map_idx++, mt_entry++)
                   if (mt_entry->physical_id == wwid)
                           return map_idx;
   
           return MPS_MAPTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_mt_idx_from_id - get map table index from a device ID
    * @sc: per adapter object
    * @dev_id: device identifer (SAS Address)
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_mt_idx_from_id(struct mps_softc *sc, u64 dev_id)
   {
           u32 map_idx;
           struct dev_mapping_table *mt_entry;
   
           for (map_idx = 0; map_idx < sc->max_devices; map_idx++) {
                   mt_entry = &sc->mapping_table[map_idx];
                   if (mt_entry->physical_id == dev_id)
                           return map_idx;
           }
           return MPS_MAPTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_ir_mt_idx_from_handle - get map table index from volume handle
    * @sc: per adapter object
    * @wwid: volume device handle
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_ir_mt_idx_from_handle(struct mps_softc *sc, u16 volHandle)
   {
           u32 start_idx, end_idx, map_idx;
           struct dev_mapping_table *mt_entry;
   
           _mapping_get_ir_maprange(sc, &start_idx, &end_idx);
           mt_entry = &sc->mapping_table[start_idx];
           for (map_idx = start_idx; map_idx <= end_idx; map_idx++, mt_entry++)
                   if (mt_entry->dev_handle == volHandle)
                           return map_idx;
   
           return MPS_MAPTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_mt_idx_from_handle - get map table index from handle
    * @sc: per adapter object
    * @dev_id: device handle
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_mt_idx_from_handle(struct mps_softc *sc, u16 handle)
   {
           u32 map_idx;
           struct dev_mapping_table *mt_entry;
   
           for (map_idx = 0; map_idx < sc->max_devices; map_idx++) {
                   mt_entry = &sc->mapping_table[map_idx];
                   if (mt_entry->dev_handle == handle)
                           return map_idx;
           }
           return MPS_MAPTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_free_ir_mt_idx - get first free index for a volume
    * @sc: per adapter object
    *
    * Search through mapping table for free index for a volume and if no free
    * index then looks for a volume with high mapping index
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_free_ir_mt_idx(struct mps_softc *sc)
   {
           u8 high_missing_count = 0;
           u32 start_idx, end_idx, map_idx;
           u32 high_idx = MPS_MAPTABLE_BAD_IDX;
           struct dev_mapping_table *mt_entry;
   
           /*
            * The IN_USE flag should be clear if the entry is available to use.
            * This flag is cleared on initialization and and when a volume is
            * deleted. All other times this flag should be set. If, for some
            * reason, a free entry cannot be found, look for the entry with the
            * highest missing count just in case there is one.
            */
           _mapping_get_ir_maprange(sc, &start_idx, &end_idx);
   
           mt_entry = &sc->mapping_table[start_idx];
           for (map_idx = start_idx; map_idx <= end_idx; map_idx++, mt_entry++) {
                   if (!(mt_entry->device_info & MPS_MAP_IN_USE))
                           return map_idx;
   
                   if (mt_entry->missing_count > high_missing_count) {
                           high_missing_count = mt_entry->missing_count;
                           high_idx = map_idx;
                   }
           }
   
           if (high_idx == MPS_MAPTABLE_BAD_IDX) {
                   mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: Could not find a "
                       "free entry in the mapping table for a Volume. The mapping "
                       "table is probably corrupt.\n", __func__);
           }
           
           return high_idx;
   }
   
   /**
    * _mapping_get_free_mt_idx - get first free index for a device
    * @sc: per adapter object
    * @start_idx: offset in the table to start search
    *
    * Returns the index of map table entry on success or bad index.
    */
   static u32
   _mapping_get_free_mt_idx(struct mps_softc *sc, u32 start_idx)
   {
           u32 map_idx, max_idx = sc->max_devices;
           struct dev_mapping_table *mt_entry = &sc->mapping_table[start_idx];
           u16 volume_mapping_flags;
   
           volume_mapping_flags = le16toh(sc->ioc_pg8.IRVolumeMappingFlags) &
               MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
           if (sc->ir_firmware && (volume_mapping_flags ==
               MPI2_IOCPAGE8_IRFLAGS_HIGH_VOLUME_MAPPING))
                   max_idx -= sc->max_volumes;
   
           for (map_idx  = start_idx; map_idx < max_idx; map_idx++, mt_entry++)
                   if (!(mt_entry->device_info & (MPS_MAP_IN_USE |
                       MPS_DEV_RESERVED)))
                           return map_idx;
   
           return MPS_MAPTABLE_BAD_IDX;
   }
   
   /**
    * _mapping_get_dpm_idx_from_id - get DPM index from ID
    * @sc: per adapter object
    * @id: volume WWID or enclosure ID or device ID
    *
    * Returns the index of DPM entry on success or bad index.
    */
   static u16
   _mapping_get_dpm_idx_from_id(struct mps_softc *sc, u64 id, u32 phy_bits)
   {
           u16 entry_num;
           uint64_t PhysicalIdentifier;
           Mpi2DriverMap0Entry_t *dpm_entry;
   
           dpm_entry = (Mpi2DriverMap0Entry_t *)((u8 *)sc->dpm_pg0 +
               sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
           PhysicalIdentifier = dpm_entry->PhysicalIdentifier.High;
           PhysicalIdentifier = (PhysicalIdentifier << 32) | 
               dpm_entry->PhysicalIdentifier.Low;
           for (entry_num = 0; entry_num < sc->max_dpm_entries; entry_num++,
               dpm_entry++)
                   if ((id == PhysicalIdentifier) &&
                       (!phy_bits || !dpm_entry->PhysicalBitsMapping ||
                       (phy_bits & dpm_entry->PhysicalBitsMapping)))
                           return entry_num;
   
           return MPS_DPM_BAD_IDX;
   }
   
   
   /**
    * _mapping_get_free_dpm_idx - get first available DPM index
    * @sc: per adapter object
    *
    * Returns the index of DPM entry on success or bad index.
    */
   static u32
   _mapping_get_free_dpm_idx(struct mps_softc *sc)
   {
           u16 entry_num;
           Mpi2DriverMap0Entry_t *dpm_entry;
           u16 current_entry = MPS_DPM_BAD_IDX, missing_cnt, high_missing_cnt = 0;
           u64 physical_id;
           struct dev_mapping_table *mt_entry;
           u32 map_idx;
   
           for (entry_num = 0; entry_num < sc->max_dpm_entries; entry_num++) {
                   dpm_entry = (Mpi2DriverMap0Entry_t *) ((u8 *)sc->dpm_pg0 +
                       sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                   dpm_entry += entry_num;
                   missing_cnt = dpm_entry->MappingInformation &
                       MPI2_DRVMAP0_MAPINFO_MISSING_MASK;
   
                   /*
                    * If entry is used and not missing, then this entry can't be
                    * used. Look at next one.
                    */
                   if (sc->dpm_entry_used[entry_num] && !missing_cnt)
                           continue;
   
                   /*
                    * If this entry is not used at all, then the missing count
                    * doesn't matter. Just use this one. Otherwise, keep looking
                    * and make sure the entry with the highest missing count is
                    * used.
                    */
                   if (!sc->dpm_entry_used[entry_num]) {
                           current_entry = entry_num;
                           break;
                   }
                   if ((current_entry == MPS_DPM_BAD_IDX) ||
                       (missing_cnt > high_missing_cnt)) {
                           current_entry = entry_num;
                           high_missing_cnt = missing_cnt;
                   }
           }
   
           /*
            * If an entry has been found to use and it's already marked as used
            * it means that some device was already using this entry but it's
            * missing, and that means that the connection between the missing
            * device's DPM entry and the mapping table needs to be cleared. To do
            * this, use the Physical ID of the old device still in the DPM entry
            * to find its mapping table entry, then mark its DPM entry as BAD.
            */
           if ((current_entry != MPS_DPM_BAD_IDX) &&
               sc->dpm_entry_used[current_entry]) {
                   dpm_entry = (Mpi2DriverMap0Entry_t *) ((u8 *)sc->dpm_pg0 +
                       sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                   dpm_entry += current_entry;
                   physical_id = dpm_entry->PhysicalIdentifier.High;
                   physical_id = (physical_id << 32) |
                       dpm_entry->PhysicalIdentifier.Low;
                   map_idx = _mapping_get_mt_idx_from_id(sc, physical_id);
                   if (map_idx != MPS_MAPTABLE_BAD_IDX) {
                           mt_entry = &sc->mapping_table[map_idx];
                           mt_entry->dpm_entry_num = MPS_DPM_BAD_IDX;
                   }
           }
           return current_entry;
   }
   
   /**
    * _mapping_update_ir_missing_cnt - Updates missing count for a volume
    * @sc: per adapter object
    * @map_idx: map table index of the volume
    * @element: IR configuration change element
    * @wwid: IR volume ID.
    *
    * Updates the missing count in the map table and in the DPM entry for a volume
    *
    * Returns nothing.
    */
   static void
   _mapping_update_ir_missing_cnt(struct mps_softc *sc, u32 map_idx,
       Mpi2EventIrConfigElement_t *element, u64 wwid)
   {
           struct dev_mapping_table *mt_entry;
           u8 missing_cnt, reason = element->ReasonCode, update_dpm = 1;
           u16 dpm_idx;
           Mpi2DriverMap0Entry_t *dpm_entry;
   
           /*
            * Depending on the reason code, update the missing count. Always set
            * the init_complete flag when here, so just do it first. That flag is
            * used for volumes to make sure that the DPM entry has been updated.
            * When a volume is deleted, clear the map entry's IN_USE flag so that
            * the entry can be used again if another volume is created. Also clear
            * its dev_handle entry so that other functions can't find this volume
            * by the handle, since it's not defined any longer.
            */
           mt_entry = &sc->mapping_table[map_idx];
           mt_entry->init_complete = 1;
           if ((reason == MPI2_EVENT_IR_CHANGE_RC_ADDED) ||
               (reason == MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED)) {
                   mt_entry->missing_count = 0;
           } else if (reason == MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED) {
                   if (mt_entry->missing_count < MPS_MAX_MISSING_COUNT)
                           mt_entry->missing_count++;
   
                   mt_entry->device_info &= ~MPS_MAP_IN_USE;
                   mt_entry->dev_handle = 0;
           }
   
           /*
            * If persistent mapping is enabled, update the DPM with the new missing
            * count for the volume. If the DPM index is bad, get a free one. If
            * it's bad for a volume that's being deleted do nothing because that
            * volume doesn't have a DPM entry. 
            */
           if (!sc->is_dpm_enable)
                   return;
           dpm_idx = mt_entry->dpm_entry_num;
           if (dpm_idx == MPS_DPM_BAD_IDX) {
                   if (reason == MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED)
                   {
                           mps_dprint(sc, MPS_MAPPING, "%s: Volume being deleted "
                               "is not in DPM so DPM missing count will not be "
                               "updated.\n", __func__);
                           return;
                   }
           }
           if (dpm_idx == MPS_DPM_BAD_IDX)
                   dpm_idx = _mapping_get_free_dpm_idx(sc);
   
           /*
            * Got the DPM entry for the volume or found a free DPM entry if this is
            * a new volume. Check if the current information is outdated.
            */
           if (dpm_idx != MPS_DPM_BAD_IDX) {
                   dpm_entry = (Mpi2DriverMap0Entry_t *)((u8 *)sc->dpm_pg0 +
                       sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                   dpm_entry += dpm_idx;
                   missing_cnt = dpm_entry->MappingInformation &
                       MPI2_DRVMAP0_MAPINFO_MISSING_MASK;
                   if ((mt_entry->physical_id ==
                       le64toh(((u64)dpm_entry->PhysicalIdentifier.High << 32) |
                       (u64)dpm_entry->PhysicalIdentifier.Low)) && (missing_cnt ==
                       mt_entry->missing_count)) {
                           mps_dprint(sc, MPS_MAPPING, "%s: DPM entry for volume "
                              "with target ID %d does not require an update.\n",
                               __func__, mt_entry->id);
                           update_dpm = 0;
                   }
           }
   
           /*
            * Update the volume's persistent info if it's new or the ID or missing
            * count has changed. If a good DPM index has not been found by now,
            * there is no space left in the DPM table.
            */
           if ((dpm_idx != MPS_DPM_BAD_IDX) && update_dpm) {
                   mps_dprint(sc, MPS_MAPPING, "%s: Update DPM entry for volume "
                       "with target ID %d.\n", __func__, mt_entry->id);
   
                   mt_entry->dpm_entry_num = dpm_idx;
                   dpm_entry = (Mpi2DriverMap0Entry_t *)((u8 *)sc->dpm_pg0 +
                       sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                   dpm_entry += dpm_idx;
                   dpm_entry->PhysicalIdentifier.Low =
                       (0xFFFFFFFF & mt_entry->physical_id);
                   dpm_entry->PhysicalIdentifier.High =
                       (mt_entry->physical_id >> 32);
                   dpm_entry->DeviceIndex = map_idx;
                   dpm_entry->MappingInformation = mt_entry->missing_count;
                   dpm_entry->PhysicalBitsMapping = 0;
                   dpm_entry->Reserved1 = 0;
                   sc->dpm_flush_entry[dpm_idx] = 1;
                   sc->dpm_entry_used[dpm_idx] = 1;
           } else if (dpm_idx == MPS_DPM_BAD_IDX) {
                   mps_dprint(sc, MPS_INFO | MPS_MAPPING, "%s: No space to add an "
                       "entry in the DPM table for volume with target ID %d.\n",
                       __func__, mt_entry->id);
           }
   }
   
   /**
    * _mapping_add_to_removal_table - add DPM index to the removal table
    * @sc: per adapter object
    * @dpm_idx: Index of DPM entry to remove
    *
    * Adds a DPM entry number to the removal table.
    *
    * Returns nothing.
    */
   static void
   _mapping_add_to_removal_table(struct mps_softc *sc, u16 dpm_idx)
   {
           struct map_removal_table *remove_entry;
           u32 i;
   
           /*
            * This is only used to remove entries from the DPM in the controller.
            * If DPM is not enabled, just return.
            */
           if (!sc->is_dpm_enable)
                   return;
   
           /*
            * Find the first available removal_table entry and add the new entry
            * there.
            */
           remove_entry = sc->removal_table;
   
           for (i = 0; i < sc->max_devices; i++, remove_entry++) {
                   if (remove_entry->dpm_entry_num != MPS_DPM_BAD_IDX)
                           continue;
    
                   mps_dprint(sc, MPS_MAPPING, "%s: Adding DPM entry %d to table "
                       "for removal.\n", __func__, dpm_idx);
                   remove_entry->dpm_entry_num = dpm_idx;
                   break;
           }
   
   }
   
   /**
    * _mapping_update_missing_count - Update missing count for a device
    * @sc: per adapter object
    * @topo_change: Topology change event entry
    *
    * Increment the missing count in the mapping table for a device that is not
    * responding. If Persitent Mapping is used, increment the DPM entry as well.
    * Currently, this function only increments the missing count if the device 
    * goes missing, so after initialization has completed. This means that the
    * missing count can only go from 0 to 1 here. The missing count is incremented
    * during initialization as well, so that's where a target's missing count can
    * go past 1.
    *
    * Returns nothing.
    */
   static void
   _mapping_update_missing_count(struct mps_softc *sc,
       struct _map_topology_change *topo_change)
   {
           u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
           u8 entry;
           struct _map_phy_change *phy_change;
           u32 map_idx;
           struct dev_mapping_table *mt_entry;
           Mpi2DriverMap0Entry_t *dpm_entry;
   
           for (entry = 0; entry < topo_change->num_entries; entry++) {
                   phy_change = &topo_change->phy_details[entry];
                   if (!phy_change->dev_handle || (phy_change->reason !=
                       MPI2_EVENT_SAS_TOPO_RC_TARG_NOT_RESPONDING))
                           continue;
                   map_idx = _mapping_get_mt_idx_from_handle(sc, phy_change->
                       dev_handle);
                   phy_change->is_processed = 1;
                   if (map_idx == MPS_MAPTABLE_BAD_IDX) {
                           mps_dprint(sc, MPS_INFO | MPS_MAPPING, "%s: device is "
                               "already removed from mapping table\n", __func__);
                           continue;
                   }
                   mt_entry = &sc->mapping_table[map_idx];
                   if (mt_entry->missing_count < MPS_MAX_MISSING_COUNT)
                           mt_entry->missing_count++;
   
                   /*
                    * When using Enc/Slot mapping, when a device is removed, it's
                    * mapping table information should be cleared. Otherwise, the
                    * target ID will be incorrect if this same device is re-added
                    * to a different slot.
                    */
                   if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                       MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
                           _mapping_clear_map_entry(mt_entry);
                   }
   
                   /*
                    * When using device mapping, update the missing count in the
                    * DPM entry, but only if the missing count has changed.
                    */
                   if (((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                       MPI2_IOCPAGE8_FLAGS_DEVICE_PERSISTENCE_MAPPING) &&
                       sc->is_dpm_enable &&
                       mt_entry->dpm_entry_num != MPS_DPM_BAD_IDX) {
                           dpm_entry =
                               (Mpi2DriverMap0Entry_t *) ((u8 *)sc->dpm_pg0 +
                               sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                           dpm_entry += mt_entry->dpm_entry_num;
                           if (dpm_entry->MappingInformation !=
                               mt_entry->missing_count) {
                                   dpm_entry->MappingInformation =
                                       mt_entry->missing_count;
                                   sc->dpm_flush_entry[mt_entry->dpm_entry_num] =
                                       1;
                           }
                   }
           }
   }
   
   /**
    * _mapping_find_enc_map_space -find map table entries for enclosure
    * @sc: per adapter object
    * @et_entry: enclosure entry
    *
    * Search through the mapping table defragment it and provide contiguous
    * space in map table for a particular enclosure entry
    *
    * Returns start index in map table or bad index.
    */
   static u32
   _mapping_find_enc_map_space(struct mps_softc *sc,
       struct enc_mapping_table *et_entry)
   {
           u16 vol_mapping_flags;
           u32 skip_count, end_of_table, map_idx, enc_idx;
           u16 num_found;
           u32 start_idx = MPS_MAPTABLE_BAD_IDX;
           struct dev_mapping_table *mt_entry;
           struct enc_mapping_table *enc_entry;
           unsigned char done_flag = 0, found_space;
           u16 max_num_phy_ids = le16toh(sc->ioc_pg8.MaxNumPhysicalMappedIDs);
   
           skip_count = sc->num_rsvd_entries;
           num_found = 0;
   
           vol_mapping_flags = le16toh(sc->ioc_pg8.IRVolumeMappingFlags) &
               MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
   
           /*
            * The end of the mapping table depends on where volumes are kept, if
            * IR is enabled.
            */
           if (!sc->ir_firmware)
                   end_of_table = sc->max_devices;
           else if (vol_mapping_flags == MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING)
                   end_of_table = sc->max_devices;
           else
                   end_of_table = sc->max_devices - sc->max_volumes;
   
           /*
            * The skip_count is the number of entries that are reserved at the
            * beginning of the mapping table. But, it does not include the number
            * of Physical IDs that are reserved for direct attached devices. Look
            * through the mapping table after these reserved entries to see if 
            * the devices for this enclosure are already mapped. The PHY bit check
            * is used to make sure that at least one PHY bit is common between the
            * enclosure and the device that is already mapped.
            */
           mps_dprint(sc, MPS_MAPPING, "%s: Looking for space in the mapping "
               "table for added enclosure.\n", __func__);
           for (map_idx = (max_num_phy_ids + skip_count);
               map_idx < end_of_table; map_idx++) {
                   mt_entry = &sc->mapping_table[map_idx];
                   if ((et_entry->enclosure_id == mt_entry->physical_id) &&
                       (!mt_entry->phy_bits || (mt_entry->phy_bits &
                       et_entry->phy_bits))) {
                           num_found += 1;
                           if (num_found == et_entry->num_slots) {
                                   start_idx = (map_idx - num_found) + 1;
                                   mps_dprint(sc, MPS_MAPPING, "%s: Found space "
                                       "in the mapping for enclosure at map index "
                                       "%d.\n", __func__, start_idx);
                                   return start_idx;
                           }
                   } else
                           num_found = 0;
           }
   
           /*
            * If the enclosure's devices are not mapped already, look for
            * contiguous entries in the mapping table that are not reserved. If
            * enough entries are found, return the starting index for that space.
            */
           num_found = 0;
           for (map_idx = (max_num_phy_ids + skip_count);
               map_idx < end_of_table; map_idx++) {
                   mt_entry = &sc->mapping_table[map_idx];
                   if (!(mt_entry->device_info & MPS_DEV_RESERVED)) {
                           num_found += 1;
                           if (num_found == et_entry->num_slots) {
                                   start_idx = (map_idx - num_found) + 1;
                                   mps_dprint(sc, MPS_MAPPING, "%s: Found space "
                                       "in the mapping for enclosure at map index "
                                       "%d.\n", __func__, start_idx);
                                   return start_idx;
                           }
                   } else
                           num_found = 0;
           }
   
           /*
            * If here, it means that not enough space in the mapping table was
            * found to support this enclosure, so go through the enclosure table to
            * see if any enclosure entries have a missing count. If so, get the
            * enclosure with the highest missing count and check it to see if there
            * is enough space for the new enclosure.
            */
           while (!done_flag) {
                   enc_idx = _mapping_get_high_missing_et_idx(sc);
                   if (enc_idx == MPS_ENCTABLE_BAD_IDX) {
                           mps_dprint(sc, MPS_MAPPING, "%s: Not enough space was "
                               "found in the mapping for the added enclosure.\n",
                               __func__);
                           return MPS_MAPTABLE_BAD_IDX;
                   }
   
                   /*
                    * Found a missing enclosure. Set the skip_search flag so this
                    * enclosure is not checked again for a high missing count if
                    * the loop continues. This way, all missing enclosures can
                    * have their space added together to find enough space in the
                    * mapping table for the added enclosure. The space must be
                    * contiguous.
                    */
                   mps_dprint(sc, MPS_MAPPING, "%s: Space from a missing "
                       "enclosure was found.\n", __func__);
                   enc_entry = &sc->enclosure_table[enc_idx];
                   enc_entry->skip_search = 1;
   
                   /*
                    * Unmark all of the missing enclosure's device's reserved
                    * space. These will be remarked as reserved if this missing
                    * enclosure's space is not used.
                    */
                   mps_dprint(sc, MPS_MAPPING, "%s: Clear the reserved flag for "
                       "all of the map entries for the enclosure.\n", __func__);
                   mt_entry = &sc->mapping_table[enc_entry->start_index];
                   for (map_idx = enc_entry->start_index; map_idx <
                      (enc_entry->start_index + enc_entry->num_slots); map_idx++,
                      mt_entry++)
                          mt_entry->device_info &= ~MPS_DEV_RESERVED;
  
                  /*
                   * Now that space has been unreserved, check again to see if
                   * enough space is available for the new enclosure.
                   */
                  mps_dprint(sc, MPS_MAPPING, "%s: Check if new mapping space is "
                      "enough for the new enclosure.\n", __func__);
                  found_space = 0;
                  num_found = 0;
                  for (map_idx = (max_num_phy_ids + skip_count);
                      map_idx < end_of_table; map_idx++) {
                          mt_entry = &sc->mapping_table[map_idx];
                          if (!(mt_entry->device_info & MPS_DEV_RESERVED)) {
                                  num_found += 1;
                                  if (num_found == et_entry->num_slots) {
                                          start_idx = (map_idx - num_found) + 1;
                                          found_space = 1;
                                          break;
                                  }
                          } else
                                  num_found = 0;
                  }
                  if (!found_space)
                          continue;
  
                  /*
                   * If enough space was found, all of the missing enclosures that
                   * will be used for the new enclosure must be added to the
                   * removal table. Then all mappings for the enclosure's devices
                   * and for the enclosure itself need to be cleared. There may be
                   * more than one enclosure to add to the removal table and
                   * clear.
                   */
                  mps_dprint(sc, MPS_MAPPING, "%s: Found space in the mapping "
                      "for enclosure at map index %d.\n", __func__, start_idx);
                  for (map_idx = start_idx; map_idx < (start_idx + num_found);
                      map_idx++) {
                          enc_entry = sc->enclosure_table;
                          for (enc_idx = 0; enc_idx < sc->num_enc_table_entries;
                              enc_idx++, enc_entry++) {
                                  if (map_idx < enc_entry->start_index ||
                                      map_idx > (enc_entry->start_index +
                                      enc_entry->num_slots))
                                          continue;
                                  if (!enc_entry->removal_flag) {
                                          mps_dprint(sc, MPS_MAPPING, "%s: "
                                              "Enclosure %d will be removed from "
                                              "the mapping table.\n", __func__,
                                              enc_idx);
                                          enc_entry->removal_flag = 1;
                                          _mapping_add_to_removal_table(sc,
                                              enc_entry->dpm_entry_num);
                                  }
                                  mt_entry = &sc->mapping_table[map_idx];
                                  _mapping_clear_map_entry(mt_entry);
                                  if (map_idx == (enc_entry->start_index +
                                      enc_entry->num_slots - 1))
                                          _mapping_clear_enc_entry(et_entry);
                          }
                  }
  
                  /*
                   * During the search for space for this enclosure, some entries
                   * in the mapping table may have been unreserved. Go back and
                   * change all of these to reserved again. Only the enclosures
                   * with the removal_flag set should be left as unreserved. The
                   * skip_search flag needs to be cleared as well so that the
                   * enclosure's space will be looked at the next time space is
                   * needed.
                   */ 
                  enc_entry = sc->enclosure_table;
                  for (enc_idx = 0; enc_idx < sc->num_enc_table_entries;
                      enc_idx++, enc_entry++) {
                          if (!enc_entry->removal_flag) {
                                  mps_dprint(sc, MPS_MAPPING, "%s: Reset the "
                                      "reserved flag for all of the map entries "
                                      "for enclosure %d.\n", __func__, enc_idx);
                                  mt_entry = &sc->mapping_table[enc_entry->
                                      start_index];
                                  for (map_idx = enc_entry->start_index; map_idx <
                                      (enc_entry->start_index +
                                      enc_entry->num_slots); map_idx++,
                                      mt_entry++)
                                          mt_entry->device_info |=
                                              MPS_DEV_RESERVED;
                                  et_entry->skip_search = 0;
                          }
                  }
                  done_flag = 1;
          }
          return start_idx;
  }
  
  /**
   * _mapping_get_dev_info -get information about newly added devices
   * @sc: per adapter object
   * @topo_change: Topology change event entry
   *
   * Search through the topology change event list and issues sas device pg0
   * requests for the newly added device and reserved entries in tables
   *
   * Returns nothing
   */
  static void
  _mapping_get_dev_info(struct mps_softc *sc,
      struct _map_topology_change *topo_change)
  {
          u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
          Mpi2ConfigReply_t mpi_reply;
          Mpi2SasDevicePage0_t sas_device_pg0;
          u8 entry, enc_idx, phy_idx;
          u32 map_idx, index, device_info;
          struct _map_phy_change *phy_change, *tmp_phy_change;
          uint64_t sas_address;
          struct enc_mapping_table *et_entry;
          struct dev_mapping_table *mt_entry;
          u8 add_code = MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED;
          int rc = 1;
  
          for (entry = 0; entry < topo_change->num_entries; entry++) {
                  phy_change = &topo_change->phy_details[entry];
                  if (phy_change->is_processed || !phy_change->dev_handle ||
                      phy_change->reason != MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED)
                          continue;
  
                  if (mps_config_get_sas_device_pg0(sc, &mpi_reply,
                      &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
                      phy_change->dev_handle)) {
                          phy_change->is_processed = 1;
                          continue;
                  }
  
                  /*
                   * Always get SATA Identify information because this is used
                   * to determine if Start/Stop Unit should be sent to the drive
                   * when the system is shutdown.
                   */
                  device_info = le32toh(sas_device_pg0.DeviceInfo);
                  sas_address = le32toh(sas_device_pg0.SASAddress.High);
                  sas_address = (sas_address << 32) |
                      le32toh(sas_device_pg0.SASAddress.Low);
                  if ((device_info & MPI2_SAS_DEVICE_INFO_END_DEVICE) &&
                      (device_info & MPI2_SAS_DEVICE_INFO_SATA_DEVICE)) {
                          rc = mpssas_get_sas_address_for_sata_disk(sc,
                              &sas_address, phy_change->dev_handle, device_info,
                              &phy_change->is_SATA_SSD);
                          if (rc) {
                                  mps_dprint(sc, MPS_ERROR, "%s: failed to get "
                                      "disk type (SSD or HDD) and SAS Address "
                                      "for SATA device with handle 0x%04x\n",
                                      __func__, phy_change->dev_handle);
                          }
                  }
  
                  phy_change->physical_id = sas_address;
                  phy_change->slot = le16toh(sas_device_pg0.Slot);
                  phy_change->device_info = device_info;
  
                  /*
                   * When using Enc/Slot mapping, if this device is an enclosure
                   * make sure that all of its slots can fit into the mapping
                   * table.
                   */
                  if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                      MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
                          /*
                           * The enclosure should already be in the enclosure
                           * table due to the Enclosure Add event. If not, just
                           * continue, nothing can be done.
                           */
                          enc_idx = _mapping_get_enc_idx_from_handle(sc,
                              topo_change->enc_handle);
                          if (enc_idx == MPS_ENCTABLE_BAD_IDX) {
                                  phy_change->is_processed = 1;
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "failed to add the device with handle "
                                      "0x%04x because the enclosure is not in "
                                      "the mapping table\n", __func__,
                                      phy_change->dev_handle);
                                  continue;
                          }
                          if (!((phy_change->device_info &
                              MPI2_SAS_DEVICE_INFO_END_DEVICE) &&
                              (phy_change->device_info &
                              (MPI2_SAS_DEVICE_INFO_SSP_TARGET |
                              MPI2_SAS_DEVICE_INFO_STP_TARGET |
                              MPI2_SAS_DEVICE_INFO_SATA_DEVICE)))) {
                                  phy_change->is_processed = 1;
                                  continue;
                          }
                          et_entry = &sc->enclosure_table[enc_idx];
  
                          /*
                           * If the enclosure already has a start_index, it's been
                           * mapped, so go to the next Topo change.
                           */
                          if (et_entry->start_index != MPS_MAPTABLE_BAD_IDX)
                                  continue;
  
                          /*
                           * If the Expander Handle is 0, the devices are direct
                           * attached. In that case, the start_index must be just 
                           * after the reserved entries. Otherwise, find space in
                           * the mapping table for the enclosure's devices.
                           */ 
                          if (!topo_change->exp_handle) {
                                  map_idx = sc->num_rsvd_entries;
                                  et_entry->start_index = map_idx;
                          } else {
                                  map_idx = _mapping_find_enc_map_space(sc,
                                      et_entry);
                                  et_entry->start_index = map_idx;
  
                                  /*
                                   * If space cannot be found to hold all of the
                                   * enclosure's devices in the mapping table,
                                   * there's no need to continue checking the
                                   * other devices in this event. Set all of the
                                   * phy_details for this event (if the change is
                                   * for an add) as already processed because none
                                   * of these devices can be added to the mapping
                                   * table.
                                   */
                                  if (et_entry->start_index ==
                                      MPS_MAPTABLE_BAD_IDX) {
                                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING,
                                              "%s: failed to add the enclosure "
                                              "with ID 0x%016jx because there is "
                                              "no free space available in the "
                                              "mapping table for all of the "
                                              "enclosure's devices.\n", __func__,
                                              (uintmax_t)et_entry->enclosure_id);
                                          phy_change->is_processed = 1;
                                          for (phy_idx = 0; phy_idx <
                                              topo_change->num_entries;
                                              phy_idx++) {
                                                  tmp_phy_change =
                                                      &topo_change->phy_details
                                                      [phy_idx];
                                                  if (tmp_phy_change->reason ==
                                                      add_code)
                                                          tmp_phy_change->
                                                              is_processed = 1;
                                          }
                                          break;
                                  }
                          }
  
                          /*
                           * Found space in the mapping table for this enclosure.
                           * Initialize each mapping table entry for the
                           * enclosure.
                           */
                          mps_dprint(sc, MPS_MAPPING, "%s: Initialize %d map "
                              "entries for the enclosure, starting at map index "
                              " %d.\n", __func__, et_entry->num_slots, map_idx);
                          mt_entry = &sc->mapping_table[map_idx];
                          for (index = map_idx; index < (et_entry->num_slots
                              + map_idx); index++, mt_entry++) {
                                  mt_entry->device_info = MPS_DEV_RESERVED;
                                  mt_entry->physical_id = et_entry->enclosure_id;
                                  mt_entry->phy_bits = et_entry->phy_bits;
                                  mt_entry->missing_count = 0;
                          }
                  }
          }
  }
  
  /**
   * _mapping_set_mid_to_eid -set map table data from enclosure table
   * @sc: per adapter object
   * @et_entry: enclosure entry
   *
   * Returns nothing
   */
  static inline void
  _mapping_set_mid_to_eid(struct mps_softc *sc,
      struct enc_mapping_table *et_entry)
  {
          struct dev_mapping_table *mt_entry;
          u16 slots = et_entry->num_slots, map_idx;
          u32 start_idx = et_entry->start_index;
  
          if (start_idx != MPS_MAPTABLE_BAD_IDX) {
                  mt_entry = &sc->mapping_table[start_idx];
                  for (map_idx = 0; map_idx < slots; map_idx++, mt_entry++)
                          mt_entry->physical_id = et_entry->enclosure_id;
          }
  }
  
  /**
   * _mapping_clear_removed_entries - mark the entries to be cleared
   * @sc: per adapter object
   *
   * Search through the removal table and mark the entries which needs to be
   * flushed to DPM and also updates the map table and enclosure table by
   * clearing the corresponding entries.
   *
   * Returns nothing
   */
  static void
  _mapping_clear_removed_entries(struct mps_softc *sc)
  {
          u32 remove_idx;
          struct map_removal_table *remove_entry;
          Mpi2DriverMap0Entry_t *dpm_entry;
          u8 done_flag = 0, num_entries, m, i;
          struct enc_mapping_table *et_entry, *from, *to;
          u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
  
          if (sc->is_dpm_enable) {
                  remove_entry = sc->removal_table;
                  for (remove_idx = 0; remove_idx < sc->max_devices;
                      remove_idx++, remove_entry++) {
                          if (remove_entry->dpm_entry_num != MPS_DPM_BAD_IDX) {
                                  dpm_entry = (Mpi2DriverMap0Entry_t *)
                                      ((u8 *) sc->dpm_pg0 +
                                      sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                                  dpm_entry += remove_entry->dpm_entry_num;
                                  dpm_entry->PhysicalIdentifier.Low = 0;
                                  dpm_entry->PhysicalIdentifier.High = 0;
                                  dpm_entry->DeviceIndex = 0;
                                  dpm_entry->MappingInformation = 0;
                                  dpm_entry->PhysicalBitsMapping = 0;
                                  sc->dpm_flush_entry[remove_entry->
                                      dpm_entry_num] = 1;
                                  sc->dpm_entry_used[remove_entry->dpm_entry_num]
                                      = 0;
                                  remove_entry->dpm_entry_num = MPS_DPM_BAD_IDX;
                          }
                  }
          }
  
          /*
           * When using Enc/Slot mapping, if a new enclosure was added and old
           * enclosure space was needed, the enclosure table may now have gaps
           * that need to be closed. All enclosure mappings need to be contiguous
           * so that space can be reused correctly if available.
           */
          if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
              MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
                  num_entries = sc->num_enc_table_entries;
                  while (!done_flag) {
                          done_flag = 1;
                          et_entry = sc->enclosure_table;
                          for (i = 0; i < num_entries; i++, et_entry++) {
                                  if (!et_entry->enc_handle && et_entry->
                                      init_complete) {
                                          done_flag = 0;
                                          if (i != (num_entries - 1)) {
                                                  from = &sc->enclosure_table
                                                      [i+1];
                                                  to = &sc->enclosure_table[i];
                                                  for (m = i; m < (num_entries -
                                                      1); m++, from++, to++) {
                                                          _mapping_set_mid_to_eid
                                                              (sc, to);
                                                          *to = *from;
                                                  }
                                                  _mapping_clear_enc_entry(to);
                                                  sc->num_enc_table_entries--;
                                                  num_entries =
                                                      sc->num_enc_table_entries;
                                          } else {
                                                  _mapping_clear_enc_entry
                                                      (et_entry);
                                                  sc->num_enc_table_entries--;
                                                  num_entries =
                                                      sc->num_enc_table_entries;
                                          }
                                  }
                          }
                  }
          }
  }
  
  /**
   * _mapping_add_new_device -Add the new device into mapping table
   * @sc: per adapter object
   * @topo_change: Topology change event entry
   *
   * Search through the topology change event list and update map table,
   * enclosure table and DPM pages for the newly added devices.
   *
   * Returns nothing
   */
  static void
  _mapping_add_new_device(struct mps_softc *sc,
      struct _map_topology_change *topo_change)
  {
          u8 enc_idx, missing_cnt, is_removed = 0;
          u16 dpm_idx;
          u32 search_idx, map_idx;
          u32 entry;
          struct dev_mapping_table *mt_entry;
          struct enc_mapping_table *et_entry;
          struct _map_phy_change *phy_change;
          u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
          Mpi2DriverMap0Entry_t *dpm_entry;
          uint64_t temp64_var;
          u8 map_shift = MPI2_DRVMAP0_MAPINFO_SLOT_SHIFT;
          u8 hdr_sz = sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER);
          u16 max_num_phy_ids = le16toh(sc->ioc_pg8.MaxNumPhysicalMappedIDs);
  
          for (entry = 0; entry < topo_change->num_entries; entry++) {
                  phy_change = &topo_change->phy_details[entry];
                  if (phy_change->is_processed)
                          continue;
                  if (phy_change->reason != MPI2_EVENT_SAS_TOPO_RC_TARG_ADDED ||
                      !phy_change->dev_handle) {
                          phy_change->is_processed = 1;
                          continue;
                  }
                  if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                      MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
                          enc_idx = _mapping_get_enc_idx_from_handle
                              (sc, topo_change->enc_handle);
                          if (enc_idx == MPS_ENCTABLE_BAD_IDX) {
                                  phy_change->is_processed = 1;
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "failed to add the device with handle "
                                      "0x%04x because the enclosure is not in "
                                      "the mapping table\n", __func__,
                                      phy_change->dev_handle);
                                  continue;
                          }
  
                          /*
                           * If the enclosure's start_index is BAD here, it means
                           * that there is no room in the mapping table to cover
                           * all of the devices that could be in the enclosure.
                           * There's no reason to process any of the devices for
                           * this enclosure since they can't be mapped.
                           */
                          et_entry = &sc->enclosure_table[enc_idx];
                          if (et_entry->start_index == MPS_MAPTABLE_BAD_IDX) {
                                  phy_change->is_processed = 1;
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "failed to add the device with handle "
                                      "0x%04x because there is no free space "
                                      "available in the mapping table\n",
                                      __func__, phy_change->dev_handle);
                                  continue;
                          }
  
                          /*
                           * Add this device to the mapping table at the correct
                           * offset where space was found to map the enclosure.
                           * Then setup the DPM entry information if being used.
                           */
                          map_idx = et_entry->start_index + phy_change->slot -
                              et_entry->start_slot;
                          mt_entry = &sc->mapping_table[map_idx];
                          mt_entry->physical_id = phy_change->physical_id;
                          mt_entry->id = map_idx;
                          mt_entry->dev_handle = phy_change->dev_handle;
                          mt_entry->missing_count = 0;
                          mt_entry->dpm_entry_num = et_entry->dpm_entry_num;
                          mt_entry->device_info = phy_change->device_info |
                              (MPS_DEV_RESERVED | MPS_MAP_IN_USE);
                          if (sc->is_dpm_enable) {
                                  dpm_idx = et_entry->dpm_entry_num;
                                  if (dpm_idx == MPS_DPM_BAD_IDX)
                                          dpm_idx = _mapping_get_dpm_idx_from_id
                                              (sc, et_entry->enclosure_id,
                                               et_entry->phy_bits);
                                  if (dpm_idx == MPS_DPM_BAD_IDX) {
                                          dpm_idx = _mapping_get_free_dpm_idx(sc);
                                          if (dpm_idx != MPS_DPM_BAD_IDX) {
                                                  dpm_entry =
                                                      (Mpi2DriverMap0Entry_t *)
                                                      ((u8 *) sc->dpm_pg0 +
                                                       hdr_sz);
                                                  dpm_entry += dpm_idx;
                                                  dpm_entry->
                                                      PhysicalIdentifier.Low =
                                                      (0xFFFFFFFF &
                                                      et_entry->enclosure_id);
                                                  dpm_entry->
                                                      PhysicalIdentifier.High =
                                                      (et_entry->enclosure_id
                                                       >> 32);
                                                  dpm_entry->DeviceIndex =
                                                      (U16)et_entry->start_index;
                                                  dpm_entry->MappingInformation =
                                                      et_entry->num_slots;
                                                  dpm_entry->MappingInformation
                                                      <<= map_shift;
                                                  dpm_entry->PhysicalBitsMapping
                                                      = et_entry->phy_bits;
                                                  et_entry->dpm_entry_num =
                                                      dpm_idx;
                                                  sc->dpm_entry_used[dpm_idx] = 1;
                                                  sc->dpm_flush_entry[dpm_idx] =
                                                      1;
                                                  phy_change->is_processed = 1;
                                          } else {
                                                  phy_change->is_processed = 1;
                                                  mps_dprint(sc, MPS_ERROR |
                                                      MPS_MAPPING, "%s: failed "
                                                      "to add the device with "
                                                      "handle 0x%04x to "
                                                      "persistent table because "
                                                      "there is no free space "
                                                      "available\n", __func__,
                                                      phy_change->dev_handle);
                                          }
                                  } else {
                                          et_entry->dpm_entry_num = dpm_idx;
                                          mt_entry->dpm_entry_num = dpm_idx;
                                  }
                          }
                          et_entry->init_complete = 1;
                  } else if ((ioc_pg8_flags &
                      MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                      MPI2_IOCPAGE8_FLAGS_DEVICE_PERSISTENCE_MAPPING) {
  
                          /*
                           * Get the mapping table index for this device. If it's
                           * not in the mapping table yet, find a free entry if
                           * one is available. If there are no free entries, look
                           * for the entry that has the highest missing count. If
                           * none of that works to find an entry in the mapping
                           * table, there is a problem. Log a message and just
                           * continue on.
                           */
                          map_idx = _mapping_get_mt_idx_from_id
                              (sc, phy_change->physical_id);
                          if (map_idx == MPS_MAPTABLE_BAD_IDX) {
                                  search_idx = sc->num_rsvd_entries;
                                  if (topo_change->exp_handle)
                                          search_idx += max_num_phy_ids;
                                  map_idx = _mapping_get_free_mt_idx(sc,
                                      search_idx);
                          }
  
                          /*
                           * If an entry will be used that has a missing device,
                           * clear its entry from  the DPM in the controller.
                           */
                          if (map_idx == MPS_MAPTABLE_BAD_IDX) {
                                  map_idx = _mapping_get_high_missing_mt_idx(sc);
                                  if (map_idx != MPS_MAPTABLE_BAD_IDX) {
                                          mt_entry = &sc->mapping_table[map_idx];
                                          _mapping_add_to_removal_table(sc,
                                              mt_entry->dpm_entry_num);
                                          is_removed = 1;
                                          mt_entry->init_complete = 0;
                                  }
                          }
                          if (map_idx != MPS_MAPTABLE_BAD_IDX) {
                                  mt_entry = &sc->mapping_table[map_idx];
                                  mt_entry->physical_id = phy_change->physical_id;
                                  mt_entry->id = map_idx;
                                  mt_entry->dev_handle = phy_change->dev_handle;
                                  mt_entry->missing_count = 0;
                                  mt_entry->device_info = phy_change->device_info
                                      | (MPS_DEV_RESERVED | MPS_MAP_IN_USE);
                          } else {
                                  phy_change->is_processed = 1;
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "failed to add the device with handle "
                                      "0x%04x because there is no free space "
                                      "available in the mapping table\n",
                                      __func__, phy_change->dev_handle);
                                  continue;
                          }
                          if (sc->is_dpm_enable) {
                                  if (mt_entry->dpm_entry_num !=
                                      MPS_DPM_BAD_IDX) {
                                          dpm_idx = mt_entry->dpm_entry_num;
                                          dpm_entry = (Mpi2DriverMap0Entry_t *)
                                              ((u8 *)sc->dpm_pg0 + hdr_sz);
                                          dpm_entry += dpm_idx;
                                          missing_cnt = dpm_entry->
                                              MappingInformation &
                                              MPI2_DRVMAP0_MAPINFO_MISSING_MASK;
                                          temp64_var = dpm_entry->
                                              PhysicalIdentifier.High;
                                          temp64_var = (temp64_var << 32) |
                                             dpm_entry->PhysicalIdentifier.Low;
  
                                          /*
                                           * If the Mapping Table's info is not
                                           * the same as the DPM entry, clear the
                                           * init_complete flag so that it's
                                           * updated.
                                           */
                                          if ((mt_entry->physical_id ==
                                              temp64_var) && !missing_cnt)
                                                  mt_entry->init_complete = 1;
                                          else
                                                  mt_entry->init_complete = 0;
                                  } else {
                                          dpm_idx = _mapping_get_free_dpm_idx(sc);
                                          mt_entry->init_complete = 0;
                                  }
                                  if (dpm_idx != MPS_DPM_BAD_IDX &&
                                      !mt_entry->init_complete) {
                                          mt_entry->dpm_entry_num = dpm_idx;
                                          dpm_entry = (Mpi2DriverMap0Entry_t *)
                                              ((u8 *)sc->dpm_pg0 + hdr_sz);
                                          dpm_entry += dpm_idx;
                                          dpm_entry->PhysicalIdentifier.Low =
                                              (0xFFFFFFFF &
                                              mt_entry->physical_id);
                                          dpm_entry->PhysicalIdentifier.High =
                                              (mt_entry->physical_id >> 32);
                                          dpm_entry->DeviceIndex = (U16) map_idx;
                                          dpm_entry->MappingInformation = 0;
                                          dpm_entry->PhysicalBitsMapping = 0;
                                          sc->dpm_entry_used[dpm_idx] = 1;
                                          sc->dpm_flush_entry[dpm_idx] = 1;
                                          phy_change->is_processed = 1;
                                  } else if (dpm_idx == MPS_DPM_BAD_IDX) {
                                          phy_change->is_processed = 1;
                                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING,
                                              "%s: failed to add the device with "
                                              "handle 0x%04x to persistent table "
                                              "because there is no free space "
                                              "available\n", __func__,
                                              phy_change->dev_handle);
                                  }
                          }
                          mt_entry->init_complete = 1;
                  }
  
                  phy_change->is_processed = 1;
          }
          if (is_removed)
                  _mapping_clear_removed_entries(sc);
  }
  
  /**
   * _mapping_flush_dpm_pages -Flush the DPM pages to NVRAM
   * @sc: per adapter object
   *
   * Returns nothing
   */
  static void
  _mapping_flush_dpm_pages(struct mps_softc *sc)
  {
          Mpi2DriverMap0Entry_t *dpm_entry;
          Mpi2ConfigReply_t mpi_reply;
          Mpi2DriverMappingPage0_t config_page;
          u16 entry_num;
  
          for (entry_num = 0; entry_num < sc->max_dpm_entries; entry_num++) {
                  if (!sc->dpm_flush_entry[entry_num])
                          continue;
                  memset(&config_page, 0, sizeof(Mpi2DriverMappingPage0_t));
                  memcpy(&config_page.Header, (u8 *)sc->dpm_pg0,
                      sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                  dpm_entry = (Mpi2DriverMap0Entry_t *) ((u8 *)sc->dpm_pg0 +
                      sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                  dpm_entry += entry_num;
                  dpm_entry->MappingInformation = htole16(dpm_entry->
                      MappingInformation);
                  dpm_entry->DeviceIndex = htole16(dpm_entry->DeviceIndex);
                  dpm_entry->PhysicalBitsMapping = htole32(dpm_entry->
                      PhysicalBitsMapping);
                  memcpy(&config_page.Entry, (u8 *)dpm_entry,
                      sizeof(Mpi2DriverMap0Entry_t));
                  /* TODO-How to handle failed writes? */
                  mps_dprint(sc, MPS_MAPPING, "%s: Flushing DPM entry %d.\n",
                      __func__, entry_num);
                  if (mps_config_set_dpm_pg0(sc, &mpi_reply, &config_page,
                      entry_num)) {
                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: Flush of "
                              "DPM entry %d for device failed\n", __func__,
                              entry_num);
                  } else
                          sc->dpm_flush_entry[entry_num] = 0;
                  dpm_entry->MappingInformation = le16toh(dpm_entry->
                      MappingInformation);
                  dpm_entry->DeviceIndex = le16toh(dpm_entry->DeviceIndex);
                  dpm_entry->PhysicalBitsMapping = le32toh(dpm_entry->
                      PhysicalBitsMapping);
          }
  }
  
  /**
   * _mapping_allocate_memory- allocates the memory required for mapping tables
   * @sc: per adapter object
   *
   * Allocates the memory for all the tables required for host mapping
   *
   * Return 0 on success or non-zero on failure.
   */
  int
  mps_mapping_allocate_memory(struct mps_softc *sc)
  {
          uint32_t dpm_pg0_sz;
  
          sc->mapping_table = malloc((sizeof(struct dev_mapping_table) *
              sc->max_devices), M_MPT2, M_ZERO|M_NOWAIT);
          if (!sc->mapping_table)
                  goto free_resources;
  
          sc->removal_table = malloc((sizeof(struct map_removal_table) *
              sc->max_devices), M_MPT2, M_ZERO|M_NOWAIT);
          if (!sc->removal_table)
                  goto free_resources;
  
          sc->enclosure_table = malloc((sizeof(struct enc_mapping_table) *
              sc->max_enclosures), M_MPT2, M_ZERO|M_NOWAIT);
          if (!sc->enclosure_table)
                  goto free_resources;
  
          sc->dpm_entry_used = malloc((sizeof(u8) * sc->max_dpm_entries),
              M_MPT2, M_ZERO|M_NOWAIT);
          if (!sc->dpm_entry_used)
                  goto free_resources;
  
          sc->dpm_flush_entry = malloc((sizeof(u8) * sc->max_dpm_entries),
              M_MPT2, M_ZERO|M_NOWAIT);
          if (!sc->dpm_flush_entry)
                  goto free_resources;
  
          dpm_pg0_sz = sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER) +
              (sc->max_dpm_entries * sizeof(MPI2_CONFIG_PAGE_DRIVER_MAP0_ENTRY));
  
          sc->dpm_pg0 = malloc(dpm_pg0_sz, M_MPT2, M_ZERO|M_NOWAIT);
          if (!sc->dpm_pg0) {
                  printf("%s: memory alloc failed for dpm page; disabling dpm\n",
                      __func__);
                  sc->is_dpm_enable = 0;
          }
  
          return 0;
  
  free_resources:
          free(sc->mapping_table, M_MPT2);
          free(sc->removal_table, M_MPT2);
          free(sc->enclosure_table, M_MPT2);
          free(sc->dpm_entry_used, M_MPT2);
          free(sc->dpm_flush_entry, M_MPT2);
          free(sc->dpm_pg0, M_MPT2);
          printf("%s: device initialization failed due to failure in mapping "
              "table memory allocation\n", __func__);
          return -1;
  }
  
  /**
   * mps_mapping_free_memory- frees the memory allocated for mapping tables
   * @sc: per adapter object
   *
   * Returns nothing.
   */
  void
  mps_mapping_free_memory(struct mps_softc *sc)
  {
          free(sc->mapping_table, M_MPT2);
          free(sc->removal_table, M_MPT2);
          free(sc->enclosure_table, M_MPT2);
          free(sc->dpm_entry_used, M_MPT2);
          free(sc->dpm_flush_entry, M_MPT2);
          free(sc->dpm_pg0, M_MPT2);
  }
  
  static void
  _mapping_process_dpm_pg0(struct mps_softc *sc)
  {
          u8 missing_cnt, enc_idx;
          u16 slot_id, entry_num, num_slots;
          u32 map_idx, dev_idx, start_idx, end_idx;
          struct dev_mapping_table *mt_entry;
          Mpi2DriverMap0Entry_t *dpm_entry;
          u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
          u16 max_num_phy_ids = le16toh(sc->ioc_pg8.MaxNumPhysicalMappedIDs);
          struct enc_mapping_table *et_entry;
          u64 physical_id;
          u32 phy_bits = 0;
  
          /*
           * start_idx and end_idx are only used for IR.
           */
          if (sc->ir_firmware)
                  _mapping_get_ir_maprange(sc, &start_idx, &end_idx);
  
          /*
           * Look through all of the DPM entries that were read from the
           * controller and copy them over to the driver's internal table if they
           * have a non-zero ID. At this point, any ID with a value of 0 would be
           * invalid, so don't copy it.
           */
          mps_dprint(sc, MPS_MAPPING, "%s: Start copy of %d DPM entries into the "
              "mapping table.\n", __func__, sc->max_dpm_entries);
          dpm_entry = (Mpi2DriverMap0Entry_t *) ((uint8_t *) sc->dpm_pg0 +
              sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
          for (entry_num = 0; entry_num < sc->max_dpm_entries; entry_num++, 
              dpm_entry++) {
                  physical_id = dpm_entry->PhysicalIdentifier.High;
                  physical_id = (physical_id << 32) | 
                      dpm_entry->PhysicalIdentifier.Low;
                  if (!physical_id) {
                          sc->dpm_entry_used[entry_num] = 0;
                          continue;
                  }
                  sc->dpm_entry_used[entry_num] = 1;
                  dpm_entry->MappingInformation = le16toh(dpm_entry->
                      MappingInformation);
                  missing_cnt = dpm_entry->MappingInformation &
                      MPI2_DRVMAP0_MAPINFO_MISSING_MASK;
                  dev_idx = le16toh(dpm_entry->DeviceIndex);
                  phy_bits = le32toh(dpm_entry->PhysicalBitsMapping);
  
                  /*
                   * Volumes are at special locations in the mapping table so
                   * account for that. Volume mapping table entries do not depend
                   * on the type of mapping, so continue the loop after adding
                   * volumes to the mapping table.
                   */
                  if (sc->ir_firmware && (dev_idx >= start_idx) &&
                      (dev_idx <= end_idx)) {
                          mt_entry = &sc->mapping_table[dev_idx];
                          mt_entry->physical_id =
                              dpm_entry->PhysicalIdentifier.High;
                          mt_entry->physical_id = (mt_entry->physical_id << 32) |
                              dpm_entry->PhysicalIdentifier.Low;
                          mt_entry->id = dev_idx;
                          mt_entry->missing_count = missing_cnt;
                          mt_entry->dpm_entry_num = entry_num;
                          mt_entry->device_info = MPS_DEV_RESERVED;
                          continue;
                  }
                  if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                      MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
  
                          /*
                           * The dev_idx for an enclosure is the start index. If
                           * the start index is within the controller's default
                           * enclosure area, set the number of slots for this
                           * enclosure to the max allowed. Otherwise, it should be
                           * a normal enclosure and the number of slots is in the
                           * DPM entry's Mapping Information.
                           */
                          if (dev_idx < (sc->num_rsvd_entries +
                              max_num_phy_ids)) {
                                  slot_id = 0;
                                  if (ioc_pg8_flags &
                                      MPI2_IOCPAGE8_FLAGS_DA_START_SLOT_1)
                                          slot_id = 1;
                                  num_slots = max_num_phy_ids;
                          } else {
                                  slot_id = 0;
                                  num_slots = dpm_entry->MappingInformation &
                                      MPI2_DRVMAP0_MAPINFO_SLOT_MASK;
                                  num_slots >>= MPI2_DRVMAP0_MAPINFO_SLOT_SHIFT;
                          }
                          enc_idx = sc->num_enc_table_entries;
                          if (enc_idx >= sc->max_enclosures) {
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "Number of enclosure entries in DPM exceed "
                                      "the max allowed of %d.\n", __func__,
                                      sc->max_enclosures);
                                  break;
                          }
                          sc->num_enc_table_entries++;
                          et_entry = &sc->enclosure_table[enc_idx];
                          physical_id = dpm_entry->PhysicalIdentifier.High;
                          et_entry->enclosure_id = (physical_id << 32) |
                              dpm_entry->PhysicalIdentifier.Low;
                          et_entry->start_index = dev_idx;
                          et_entry->dpm_entry_num = entry_num;
                          et_entry->num_slots = num_slots;
                          et_entry->start_slot = slot_id;
                          et_entry->missing_count = missing_cnt;
                          et_entry->phy_bits = phy_bits;
  
                          /*
                           * Initialize all entries for this enclosure in the
                           * mapping table and mark them as reserved. The actual
                           * devices have not been processed yet but when they are
                           * they will use these entries. If an entry is found
                           * that already has a valid DPM index, the mapping table
                           * is corrupt. This can happen if the mapping type is
                           * changed without clearing all of the DPM entries in
                           * the controller.
                           */
                          mt_entry = &sc->mapping_table[dev_idx];
                          for (map_idx = dev_idx; map_idx < (dev_idx + num_slots);
                              map_idx++, mt_entry++) {
                                  if (mt_entry->dpm_entry_num !=
                                      MPS_DPM_BAD_IDX) {
                                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING,
                                              "%s: Conflict in mapping table for "
                                              " enclosure %d\n", __func__,
                                              enc_idx);
                                          break;
                                  }
                                  physical_id =
                                      dpm_entry->PhysicalIdentifier.High;
                                  mt_entry->physical_id = (physical_id << 32) |
                                      dpm_entry->PhysicalIdentifier.Low;
                                  mt_entry->phy_bits = phy_bits;
                                  mt_entry->id = dev_idx;
                                  mt_entry->dpm_entry_num = entry_num;
                                  mt_entry->missing_count = missing_cnt;
                                  mt_entry->device_info = MPS_DEV_RESERVED;
                          }
                  } else if ((ioc_pg8_flags &
                      MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
                      MPI2_IOCPAGE8_FLAGS_DEVICE_PERSISTENCE_MAPPING) {
  
                          /*
                           * Device mapping, so simply copy the DPM entries to the
                           * mapping table, but check for a corrupt mapping table
                           * (as described above in Enc/Slot mapping).
                           */
                          map_idx = dev_idx;
                          mt_entry = &sc->mapping_table[map_idx];
                          if (mt_entry->dpm_entry_num != MPS_DPM_BAD_IDX) {
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "Conflict in mapping table for device %d\n",
                                      __func__, map_idx);
                                  break;
                          }
                          physical_id = dpm_entry->PhysicalIdentifier.High;
                          mt_entry->physical_id = (physical_id << 32) |
                              dpm_entry->PhysicalIdentifier.Low;
                          mt_entry->phy_bits = phy_bits;
                          mt_entry->id = dev_idx;
                          mt_entry->missing_count = missing_cnt;
                          mt_entry->dpm_entry_num = entry_num;
                          mt_entry->device_info = MPS_DEV_RESERVED;
                  }
          } /*close the loop for DPM table */
  }
  
  /*
   * mps_mapping_check_devices - start of the day check for device availabilty
   * @sc: per adapter object
   *
   * Returns nothing.
   */
  void
  mps_mapping_check_devices(void *data)
  {
          u32 i;
          struct dev_mapping_table *mt_entry;
          struct mps_softc *sc = (struct mps_softc *)data;
          u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
          struct enc_mapping_table *et_entry;
          u32 start_idx = 0, end_idx = 0;
          u8 stop_device_checks = 0;
  
          MPS_FUNCTRACE(sc);
  
          /*
           * Clear this flag so that this function is never called again except
           * within this function if the check needs to be done again. The
           * purpose is to check for missing devices that are currently in the
           * mapping table so do this only at driver init after discovery.
           */
          sc->track_mapping_events = 0;
  
          /*
           * callout synchronization
           * This is used to prevent race conditions for the callout. 
           */
          mps_dprint(sc, MPS_MAPPING, "%s: Start check for missing devices.\n",
              __func__);
          mtx_assert(&sc->mps_mtx, MA_OWNED);
          if ((callout_pending(&sc->device_check_callout)) ||
              (!callout_active(&sc->device_check_callout))) {
                  mps_dprint(sc, MPS_MAPPING, "%s: Device Check Callout is "
                      "already pending or not active.\n", __func__);
                  return;
          }
          callout_deactivate(&sc->device_check_callout);
  
          /*
           * Use callout to check if any devices in the mapping table have been
           * processed yet. If ALL devices are marked as not init_complete, no
           * devices have been processed and mapped. Until devices are mapped
           * there's no reason to mark them as missing. Continue resetting this
           * callout until devices have been mapped.
           */
          if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
              MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
                  et_entry = sc->enclosure_table;
                  for (i = 0; i < sc->num_enc_table_entries; i++, et_entry++) {
                          if (et_entry->init_complete) {
                                  stop_device_checks = 1;
                                  break;
                          }
                  }
          } else if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
              MPI2_IOCPAGE8_FLAGS_DEVICE_PERSISTENCE_MAPPING) {
                  mt_entry = sc->mapping_table;
                  for (i = 0; i < sc->max_devices; i++, mt_entry++) {
                          if (mt_entry->init_complete) {
                                  stop_device_checks = 1;
                                  break;
                          }
                  }
          }
  
          /*
           * Setup another callout check after a delay. Keep doing this until
           * devices are mapped.
           */
          if (!stop_device_checks) {
                  mps_dprint(sc, MPS_MAPPING, "%s: No devices have been mapped. "
                      "Reset callout to check again after a %d second delay.\n",
                      __func__, MPS_MISSING_CHECK_DELAY);
                  callout_reset(&sc->device_check_callout,
                      MPS_MISSING_CHECK_DELAY * hz, mps_mapping_check_devices,
                      sc);
                  return;
          }
          mps_dprint(sc, MPS_MAPPING, "%s: Device check complete.\n", __func__);
  
          /*
           * Depending on the mapping type, check if devices have been processed
           * and update their missing counts if not processed.
           */
          if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
              MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING) {
                  et_entry = sc->enclosure_table;
                  for (i = 0; i < sc->num_enc_table_entries; i++, et_entry++) {
                          if (!et_entry->init_complete) {
                                  if (et_entry->missing_count <
                                      MPS_MAX_MISSING_COUNT) {
                                          mps_dprint(sc, MPS_MAPPING, "%s: "
                                              "Enclosure %d is missing from the "
                                              "topology. Update its missing "
                                              "count.\n", __func__, i);
                                          et_entry->missing_count++;
                                          if (et_entry->dpm_entry_num !=
                                              MPS_DPM_BAD_IDX) {
                                                  _mapping_commit_enc_entry(sc,
                                                      et_entry);
                                          }
                                  }
                                  et_entry->init_complete = 1;
                          }
                  }
                  if (!sc->ir_firmware)
                          return;
                  _mapping_get_ir_maprange(sc, &start_idx, &end_idx);
                  mt_entry = &sc->mapping_table[start_idx];
          } else if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) ==
              MPI2_IOCPAGE8_FLAGS_DEVICE_PERSISTENCE_MAPPING) {
                  start_idx = 0;
                  end_idx = sc->max_devices - 1;
                  mt_entry = sc->mapping_table;
          }
  
          /*
           * The start and end indices have been set above according to the
           * mapping type. Go through these mappings and update any entries that
           * do not have the init_complete flag set, which means they are missing.
           */
          if (end_idx == 0)
                  return;
          for (i = start_idx; i < (end_idx + 1); i++, mt_entry++) {
                  if (mt_entry->device_info & MPS_DEV_RESERVED
                      && !mt_entry->physical_id)
                          mt_entry->init_complete = 1;
                  else if (mt_entry->device_info & MPS_DEV_RESERVED) {
                          if (!mt_entry->init_complete) {
                                  mps_dprint(sc, MPS_MAPPING, "%s: Device in "
                                      "mapping table at index %d is missing from "
                                      "topology. Update its missing count.\n",
                                      __func__, i);
                                  if (mt_entry->missing_count <
                                      MPS_MAX_MISSING_COUNT) {
                                          mt_entry->missing_count++;
                                          if (mt_entry->dpm_entry_num !=
                                              MPS_DPM_BAD_IDX) {
                                                  _mapping_commit_map_entry(sc,
                                                      mt_entry);
                                          }
                                  }
                                  mt_entry->init_complete = 1;
                          }
                  }
          }
  }
  
  /**
   * mps_mapping_initialize - initialize mapping tables
   * @sc: per adapter object
   *
   * Read controller persitant mapping tables into internal data area.
   *
   * Return 0 for success or non-zero for failure.
   */
  int
  mps_mapping_initialize(struct mps_softc *sc)
  {
          uint16_t volume_mapping_flags, dpm_pg0_sz;
          uint32_t i;
          Mpi2ConfigReply_t mpi_reply;
          int error;
          uint8_t retry_count;
          uint16_t ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
  
          /* The additional 1 accounts for the virtual enclosure
           * created for the controller
           */
          sc->max_enclosures = sc->facts->MaxEnclosures + 1;
          sc->max_expanders = sc->facts->MaxSasExpanders;
          sc->max_volumes = sc->facts->MaxVolumes;
          sc->max_devices = sc->facts->MaxTargets + sc->max_volumes;
          sc->pending_map_events = 0;
          sc->num_enc_table_entries = 0;
          sc->num_rsvd_entries = 0;
          sc->max_dpm_entries = sc->ioc_pg8.MaxPersistentEntries;
          sc->is_dpm_enable = (sc->max_dpm_entries) ? 1 : 0;
          sc->track_mapping_events = 0;
          
  
          mps_dprint(sc, MPS_MAPPING, "%s: Mapping table has a max of %d entries "
              "and DPM has a max of %d entries.\n", __func__, sc->max_devices,
              sc->max_dpm_entries);
          if (ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_DISABLE_PERSISTENT_MAPPING)
                  sc->is_dpm_enable = 0;
  
          if (ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_RESERVED_TARGETID_0)
                  sc->num_rsvd_entries = 1;
  
          volume_mapping_flags = sc->ioc_pg8.IRVolumeMappingFlags &
              MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
          if (sc->ir_firmware && (volume_mapping_flags ==
              MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING))
                  sc->num_rsvd_entries += sc->max_volumes;
  
          error = mps_mapping_allocate_memory(sc);
          if (error)
                  return (error);
  
          for (i = 0; i < sc->max_devices; i++)
                  _mapping_clear_map_entry(sc->mapping_table + i);
  
          for (i = 0; i < sc->max_enclosures; i++)
                  _mapping_clear_enc_entry(sc->enclosure_table + i);
  
          for (i = 0; i < sc->max_devices; i++) {
                  sc->removal_table[i].dev_handle = 0;
                  sc->removal_table[i].dpm_entry_num = MPS_DPM_BAD_IDX;
          }
  
          memset(sc->dpm_entry_used, 0, sc->max_dpm_entries);
          memset(sc->dpm_flush_entry, 0, sc->max_dpm_entries);
  
          if (sc->is_dpm_enable) {
                  dpm_pg0_sz = sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER) +
                      (sc->max_dpm_entries *
                       sizeof(MPI2_CONFIG_PAGE_DRIVER_MAP0_ENTRY));
                  retry_count = 0;
  
  retry_read_dpm:
                  if (mps_config_get_dpm_pg0(sc, &mpi_reply, sc->dpm_pg0,
                      dpm_pg0_sz)) {
                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: DPM page "
                              "read failed.\n", __func__);
                          if (retry_count < 3) {
                                  retry_count++;
                                  goto retry_read_dpm;
                          }
                          sc->is_dpm_enable = 0;
                  }
          }
  
          if (sc->is_dpm_enable)
                  _mapping_process_dpm_pg0(sc);
          else {
                  mps_dprint(sc, MPS_MAPPING, "%s: DPM processing is disabled. "
                      "Device mappings will not persist across reboots or "
                      "resets.\n", __func__);
          }
  
          sc->track_mapping_events = 1;
          return 0;
  }
  
  /**
   * mps_mapping_exit - clear mapping table and associated memory
   * @sc: per adapter object
   *
   * Returns nothing.
   */
  void
  mps_mapping_exit(struct mps_softc *sc)
  {
          _mapping_flush_dpm_pages(sc);
          mps_mapping_free_memory(sc);
  }
  
  /**
   * mps_mapping_get_tid - return the target id for sas device and handle
   * @sc: per adapter object
   * @sas_address: sas address of the device
   * @handle: device handle
   *
   * Returns valid target ID on success or BAD_ID.
   */
  unsigned int
  mps_mapping_get_tid(struct mps_softc *sc, uint64_t sas_address, u16 handle)
  {
          u32 map_idx;
          struct dev_mapping_table *mt_entry;
  
          for (map_idx = 0; map_idx < sc->max_devices; map_idx++) {
                  mt_entry = &sc->mapping_table[map_idx];
                  if (mt_entry->dev_handle == handle && mt_entry->physical_id ==
                      sas_address)
                          return mt_entry->id;
          }
  
          return MPS_MAP_BAD_ID;
  }
  
  /**
   * mps_mapping_get_tid_from_handle - find a target id in mapping table using
   * only the dev handle.  This is just a wrapper function for the local function
   * _mapping_get_mt_idx_from_handle.
   * @sc: per adapter object
   * @handle: device handle
   *
   * Returns valid target ID on success or BAD_ID.
   */
  unsigned int
  mps_mapping_get_tid_from_handle(struct mps_softc *sc, u16 handle)
  {
          return (_mapping_get_mt_idx_from_handle(sc, handle));
  }
  
  /**
   * mps_mapping_get_raid_tid - return the target id for raid device
   * @sc: per adapter object
   * @wwid: world wide identifier for raid volume
   * @volHandle: volume device handle
   *
   * Returns valid target ID on success or BAD_ID.
   */
  unsigned int
  mps_mapping_get_raid_tid(struct mps_softc *sc, u64 wwid, u16 volHandle)
  {
          u32 start_idx, end_idx, map_idx;
          struct dev_mapping_table *mt_entry;
  
          _mapping_get_ir_maprange(sc, &start_idx, &end_idx);
          mt_entry = &sc->mapping_table[start_idx];
          for (map_idx  = start_idx; map_idx <= end_idx; map_idx++, mt_entry++) {
                  if (mt_entry->dev_handle == volHandle &&
                      mt_entry->physical_id == wwid)
                          return mt_entry->id;
          }
  
          return MPS_MAP_BAD_ID;
  }
  
  /**
   * mps_mapping_get_raid_tid_from_handle - find raid device in mapping table
   * using only the volume dev handle.  This is just a wrapper function for the
   * local function _mapping_get_ir_mt_idx_from_handle.
   * @sc: per adapter object
   * @volHandle: volume device handle
   *
   * Returns valid target ID on success or BAD_ID.
   */
  unsigned int
  mps_mapping_get_raid_tid_from_handle(struct mps_softc *sc, u16 volHandle)
  {
          return (_mapping_get_ir_mt_idx_from_handle(sc, volHandle));
  }
  
  /**
   * mps_mapping_enclosure_dev_status_change_event - handle enclosure events
   * @sc: per adapter object
   * @event_data: event data payload
   *
   * Return nothing.
   */
  void
  mps_mapping_enclosure_dev_status_change_event(struct mps_softc *sc,
      Mpi2EventDataSasEnclDevStatusChange_t *event_data)
  {
          u8 enc_idx, missing_count;
          struct enc_mapping_table *et_entry;
          Mpi2DriverMap0Entry_t *dpm_entry;
          u16 ioc_pg8_flags = le16toh(sc->ioc_pg8.Flags);
          u8 map_shift = MPI2_DRVMAP0_MAPINFO_SLOT_SHIFT;
          u8 update_phy_bits = 0;
          u32 saved_phy_bits;
          uint64_t temp64_var;
  
          if ((ioc_pg8_flags & MPI2_IOCPAGE8_FLAGS_MASK_MAPPING_MODE) !=
              MPI2_IOCPAGE8_FLAGS_ENCLOSURE_SLOT_MAPPING)
                  goto out;
  
          dpm_entry = (Mpi2DriverMap0Entry_t *)((u8 *)sc->dpm_pg0 +
              sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
  
          if (event_data->ReasonCode == MPI2_EVENT_SAS_ENCL_RC_ADDED) {
                  if (!event_data->NumSlots) {
                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: Enclosure "
                              "with handle = 0x%x reported 0 slots.\n", __func__,
                              le16toh(event_data->EnclosureHandle));
                          goto out;
                  }
                  temp64_var = event_data->EnclosureLogicalID.High;
                  temp64_var = (temp64_var << 32) |
                      event_data->EnclosureLogicalID.Low;
                  enc_idx = _mapping_get_enc_idx_from_id(sc, temp64_var,
                      event_data->PhyBits);
  
                  /*
                   * If the Added enclosure is already in the Enclosure Table,
                   * make sure that all the the enclosure info is up to date. If
                   * the enclosure was missing and has just been added back, or if
                   * the enclosure's Phy Bits have changed, clear the missing
                   * count and update the Phy Bits in the mapping table and in the
                   * DPM, if it's being used.
                   */
                  if (enc_idx != MPS_ENCTABLE_BAD_IDX) {
                          et_entry = &sc->enclosure_table[enc_idx];
                          if (et_entry->init_complete &&
                              !et_entry->missing_count) {
                                  mps_dprint(sc, MPS_MAPPING, "%s: Enclosure %d "
                                      "is already present with handle = 0x%x\n",
                                      __func__, enc_idx, et_entry->enc_handle);
                                  goto out;
                          }
                          et_entry->enc_handle = le16toh(event_data->
                              EnclosureHandle);
                          et_entry->start_slot = le16toh(event_data->StartSlot);
                          saved_phy_bits = et_entry->phy_bits;
                          et_entry->phy_bits |= le32toh(event_data->PhyBits);
                          if (saved_phy_bits != et_entry->phy_bits)
                                  update_phy_bits = 1;
                          if (et_entry->missing_count || update_phy_bits) {
                                  et_entry->missing_count = 0;
                                  if (sc->is_dpm_enable &&
                                      et_entry->dpm_entry_num !=
                                      MPS_DPM_BAD_IDX) {
                                          dpm_entry += et_entry->dpm_entry_num;
                                          missing_count =
                                              (u8)(dpm_entry->MappingInformation &
                                              MPI2_DRVMAP0_MAPINFO_MISSING_MASK);
                                          if (missing_count || update_phy_bits) {
                                                  dpm_entry->MappingInformation
                                                      = et_entry->num_slots;
                                                  dpm_entry->MappingInformation
                                                      <<= map_shift;
                                                  dpm_entry->PhysicalBitsMapping
                                                      = et_entry->phy_bits;
                                                  sc->dpm_flush_entry[et_entry->
                                                      dpm_entry_num] = 1;
                                          }
                                  }
                          }
                  } else {
                          /*
                           * This is a new enclosure that is being added.
                           * Initialize the Enclosure Table entry. It will be
                           * finalized when a device is added for the enclosure
                           * and the enclosure has enough space in the Mapping
                           * Table to map its devices.
                           */
                          enc_idx = sc->num_enc_table_entries;
                          if (enc_idx >= sc->max_enclosures) {
                                  mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: "
                                      "Enclosure cannot be added to mapping "
                                      "table because it's full.\n", __func__);
                                  goto out;
                          }
                          sc->num_enc_table_entries++;
                          et_entry = &sc->enclosure_table[enc_idx];
                          et_entry->enc_handle = le16toh(event_data->
                              EnclosureHandle);
                          et_entry->enclosure_id = le64toh(event_data->
                              EnclosureLogicalID.High);
                          et_entry->enclosure_id =
                              ((et_entry->enclosure_id << 32) |
                              le64toh(event_data->EnclosureLogicalID.Low));
                          et_entry->start_index = MPS_MAPTABLE_BAD_IDX;
                          et_entry->dpm_entry_num = MPS_DPM_BAD_IDX;
                          et_entry->num_slots = le16toh(event_data->NumSlots);
                          et_entry->start_slot = le16toh(event_data->StartSlot);
                          et_entry->phy_bits = le32toh(event_data->PhyBits);
                  }
                  et_entry->init_complete = 1;
          } else if (event_data->ReasonCode ==
              MPI2_EVENT_SAS_ENCL_RC_NOT_RESPONDING) {
                  /*
                   * An enclosure was removed. Update its missing count and then
                   * update the DPM entry with the new missing count for the
                   * enclosure.
                   */
                  enc_idx = _mapping_get_enc_idx_from_handle(sc,
                      le16toh(event_data->EnclosureHandle));
                  if (enc_idx == MPS_ENCTABLE_BAD_IDX) {
                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING, "%s: Cannot "
                              "unmap enclosure %d because it has already been "
                              "deleted.\n", __func__, enc_idx);
                          goto out;
                  }
                  et_entry = &sc->enclosure_table[enc_idx];
                  if (et_entry->missing_count < MPS_MAX_MISSING_COUNT)
                          et_entry->missing_count++;
                  if (sc->is_dpm_enable &&
                      et_entry->dpm_entry_num != MPS_DPM_BAD_IDX) {
                          dpm_entry += et_entry->dpm_entry_num;
                          dpm_entry->MappingInformation = et_entry->num_slots;
                          dpm_entry->MappingInformation <<= map_shift;
                          dpm_entry->MappingInformation |=
                              et_entry->missing_count;
                          sc->dpm_flush_entry[et_entry->dpm_entry_num] = 1;
                  }
                  et_entry->init_complete = 1;
          }
  
  out:
          _mapping_flush_dpm_pages(sc);
          if (sc->pending_map_events)
                  sc->pending_map_events--;
  }
  
  /**
   * mps_mapping_topology_change_event - handle topology change events
   * @sc: per adapter object
   * @event_data: event data payload
   *
   * Returns nothing.
   */
  void
  mps_mapping_topology_change_event(struct mps_softc *sc,
      Mpi2EventDataSasTopologyChangeList_t *event_data)
  {
          struct _map_topology_change topo_change;
          struct _map_phy_change *phy_change;
          Mpi2EventSasTopoPhyEntry_t *event_phy_change;
          u8 i, num_entries;
  
          topo_change.enc_handle = le16toh(event_data->EnclosureHandle);
          topo_change.exp_handle = le16toh(event_data->ExpanderDevHandle);
          num_entries = event_data->NumEntries;
          topo_change.num_entries = num_entries;
          topo_change.start_phy_num = event_data->StartPhyNum;
          topo_change.num_phys = event_data->NumPhys;
          topo_change.exp_status = event_data->ExpStatus;
          event_phy_change = event_data->PHY;
          topo_change.phy_details = NULL;
  
          if (!num_entries)
                  goto out;
          phy_change = malloc(sizeof(struct _map_phy_change) * num_entries,
              M_MPT2, M_NOWAIT|M_ZERO);
          topo_change.phy_details = phy_change;
          if (!phy_change)
                  goto out;
          for (i = 0; i < num_entries; i++, event_phy_change++, phy_change++) {
                  phy_change->dev_handle = le16toh(event_phy_change->
                      AttachedDevHandle);
                  phy_change->reason = event_phy_change->PhyStatus &
                      MPI2_EVENT_SAS_TOPO_RC_MASK;
          }
          _mapping_update_missing_count(sc, &topo_change);
          _mapping_get_dev_info(sc, &topo_change);
          _mapping_clear_removed_entries(sc);
          _mapping_add_new_device(sc, &topo_change);
  
  out:
          free(topo_change.phy_details, M_MPT2);
          _mapping_flush_dpm_pages(sc);
          if (sc->pending_map_events)
                  sc->pending_map_events--;
  }
  
  /**
   * mps_mapping_ir_config_change_event - handle IR config change list events
   * @sc: per adapter object
   * @event_data: event data payload
   *
   * Returns nothing.
   */
  void
  mps_mapping_ir_config_change_event(struct mps_softc *sc,
      Mpi2EventDataIrConfigChangeList_t *event_data)
  {
          Mpi2EventIrConfigElement_t *element;
          int i;
          u64 *wwid_table;
          u32 map_idx, flags;
          struct dev_mapping_table *mt_entry;
          u16 element_flags;
  
          wwid_table = malloc(sizeof(u64) * event_data->NumElements, M_MPT2,
              M_NOWAIT | M_ZERO);
          if (!wwid_table)
                  goto out;
          element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
          flags = le32toh(event_data->Flags);
  
          /*
           * For volume changes, get the WWID for the volume and put it in a
           * table to be used in the processing of the IR change event.
           */
          for (i = 0; i < event_data->NumElements; i++, element++) {
                  element_flags = le16toh(element->ElementFlags);
                  if ((element->ReasonCode != MPI2_EVENT_IR_CHANGE_RC_ADDED) &&
                      (element->ReasonCode != MPI2_EVENT_IR_CHANGE_RC_REMOVED) &&
                      (element->ReasonCode != MPI2_EVENT_IR_CHANGE_RC_NO_CHANGE)
                      && (element->ReasonCode !=
                          MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED))
                          continue;
                  if ((element_flags &
                      MPI2_EVENT_IR_CHANGE_EFLAGS_ELEMENT_TYPE_MASK) ==
                      MPI2_EVENT_IR_CHANGE_EFLAGS_VOLUME_ELEMENT) {
                          mps_config_get_volume_wwid(sc,
                              le16toh(element->VolDevHandle), &wwid_table[i]);
                  }
          }
  
          /*
           * Check the ReasonCode for each element in the IR event and Add/Remove
           * Volumes or Physical Disks of Volumes to/from the mapping table. Use
           * the WWIDs gotten above in wwid_table.
           */
          if (flags == MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG)
                  goto out;
          else {
                  element = (Mpi2EventIrConfigElement_t *)&event_data->
                      ConfigElement[0];
                  for (i = 0; i < event_data->NumElements; i++, element++) {
                          if (element->ReasonCode ==
                              MPI2_EVENT_IR_CHANGE_RC_ADDED ||
                              element->ReasonCode ==
                              MPI2_EVENT_IR_CHANGE_RC_VOLUME_CREATED) {
                                  map_idx = _mapping_get_ir_mt_idx_from_wwid
                                      (sc, wwid_table[i]);
                                  if (map_idx != MPS_MAPTABLE_BAD_IDX) {
                                          /*
                                           * The volume is already in the mapping
                                           * table. Just update it's info.
                                           */
                                          mt_entry = &sc->mapping_table[map_idx];
                                          mt_entry->id = map_idx;
                                          mt_entry->dev_handle = le16toh
                                              (element->VolDevHandle);
                                          mt_entry->device_info =
                                              MPS_DEV_RESERVED | MPS_MAP_IN_USE;
                                          _mapping_update_ir_missing_cnt(sc,
                                              map_idx, element, wwid_table[i]);
                                          continue;
                                  }
  
                                  /*
                                   * Volume is not in mapping table yet. Find a
                                   * free entry in the mapping table at the
                                   * volume mapping locations. If no entries are
                                   * available, this is an error because it means
                                   * there are more volumes than can be mapped
                                   * and that should never happen for volumes.
                                   */
                                  map_idx = _mapping_get_free_ir_mt_idx(sc);
                                  if (map_idx == MPS_MAPTABLE_BAD_IDX)
                                  {
                                          mps_dprint(sc, MPS_ERROR | MPS_MAPPING,
                                              "%s: failed to add the volume with "
                                              "handle 0x%04x because there is no "
                                              "free space available in the "
                                              "mapping table\n", __func__,
                                              le16toh(element->VolDevHandle));
                                          continue;
                                  }
                                  mt_entry = &sc->mapping_table[map_idx];
                                  mt_entry->physical_id = wwid_table[i];
                                  mt_entry->id = map_idx;
                                  mt_entry->dev_handle = le16toh(element->
                                      VolDevHandle);
                                  mt_entry->device_info = MPS_DEV_RESERVED |
                                      MPS_MAP_IN_USE;
                                  _mapping_update_ir_missing_cnt(sc, map_idx,
                                      element, wwid_table[i]);
                          } else if (element->ReasonCode ==
                              MPI2_EVENT_IR_CHANGE_RC_REMOVED) {
                                  map_idx = _mapping_get_ir_mt_idx_from_wwid(sc,
                                      wwid_table[i]);
                                  if (map_idx == MPS_MAPTABLE_BAD_IDX) {
                                          mps_dprint(sc, MPS_MAPPING,"%s: Failed "
                                              "to remove a volume because it has "
                                              "already been removed.\n",
                                              __func__);
                                          continue;
                                  }
                                  _mapping_update_ir_missing_cnt(sc, map_idx,
                                      element, wwid_table[i]);
                          } else if (element->ReasonCode ==
                              MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED) {
                                  map_idx = _mapping_get_mt_idx_from_handle(sc,
                                      le16toh(element->VolDevHandle));
                                  if (map_idx == MPS_MAPTABLE_BAD_IDX) {
                                          mps_dprint(sc, MPS_MAPPING,"%s: Failed "
                                              "to remove volume with handle "
                                              "0x%04x because it has already "
                                              "been removed.\n", __func__,
                                              le16toh(element->VolDevHandle));
                                          continue;
                                  }
                                  mt_entry = &sc->mapping_table[map_idx];
                                  _mapping_update_ir_missing_cnt(sc, map_idx,
                                      element, mt_entry->physical_id);
                          }
                  }
          }
  
  out:
          _mapping_flush_dpm_pages(sc);
          free(wwid_table, M_MPT2);
          if (sc->pending_map_events)
                  sc->pending_map_events--;
  }
  
  int
  mps_mapping_dump(SYSCTL_HANDLER_ARGS)
  {
          struct mps_softc *sc;
          struct dev_mapping_table *mt_entry;
          struct sbuf sbuf;
          int i, error;
  
          sc = (struct mps_softc *)arg1;
  
          error = sysctl_wire_old_buffer(req, 0);
          if (error != 0)
                  return (error);
          sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
  
          sbuf_printf(&sbuf, "\nindex physical_id       handle id\n");
          for (i = 0; i < sc->max_devices; i++) {
                  mt_entry = &sc->mapping_table[i];
                  if (mt_entry->physical_id == 0)
                          continue;
                  sbuf_printf(&sbuf, "%4d  %jx  %04x   %hd\n",
                      i, mt_entry->physical_id, mt_entry->dev_handle,
                      mt_entry->id);
          }
          error = sbuf_finish(&sbuf);
          sbuf_delete(&sbuf);
          return (error);
  }
  
  int
  mps_mapping_encl_dump(SYSCTL_HANDLER_ARGS)
  {
          struct mps_softc *sc;
          struct enc_mapping_table *enc_entry;
          struct sbuf sbuf;
          int i, error;
  
          sc = (struct mps_softc *)arg1;
  
          error = sysctl_wire_old_buffer(req, 0);
          if (error != 0)
                  return (error);
          sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
  
          sbuf_printf(&sbuf, "\nindex enclosure_id      handle map_index\n");
          for (i = 0; i < sc->max_enclosures; i++) {
                  enc_entry = &sc->enclosure_table[i];
                  if (enc_entry->enclosure_id == 0)
                          continue;
                  sbuf_printf(&sbuf, "%4d  %jx  %04x   %d\n",
                      i, enc_entry->enclosure_id, enc_entry->enc_handle,
                      enc_entry->start_index);
          }
          error = sbuf_finish(&sbuf);
          sbuf_delete(&sbuf);
          return (error);
  }

Cache object: bbbc5a0ac15ac70f8ba17982de5ec43e