path: root/drivers/scsi/esas2r/esas2r_disc.c

/*
 *  linux/drivers/scsi/esas2r/esas2r_disc.c
 *      esas2r device discovery routines
 *
 *  Copyright (c) 2001-2013 ATTO Technology, Inc.
 *  (mailto:linuxdrivers@attotech.com)
 */
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  NO WARRANTY
 *  THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
 *  CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
 *  LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
 *  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
 *  solely responsible for determining the appropriateness of using and
 *  distributing the Program and assumes all risks associated with its
 *  exercise of rights under this Agreement, including but not limited to
 *  the risks and costs of program errors, damage to or loss of data,
 *  programs or equipment, and unavailability or interruption of operations.
 *
 *  DISCLAIMER OF LIABILITY
 *  NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
 *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
 *  HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

#include "esas2r.h"

/* Miscellaneous internal discovery routines */
static void esas2r_disc_abort(struct esas2r_adapter *a,
			      struct esas2r_request *rq);
static bool esas2r_disc_continue(struct esas2r_adapter *a,
				 struct esas2r_request *rq);
static void esas2r_disc_fix_curr_requests(struct esas2r_adapter *a);
static u32 esas2r_disc_get_phys_addr(struct esas2r_sg_context *sgc, u64 *addr);
static bool esas2r_disc_start_request(struct esas2r_adapter *a,
				      struct esas2r_request *rq);

/* Internal discovery routines that process the states */
static bool esas2r_disc_block_dev_scan(struct esas2r_adapter *a,
				       struct esas2r_request *rq);
static void esas2r_disc_block_dev_scan_cb(struct esas2r_adapter *a,
					  struct esas2r_request *rq);
static bool esas2r_disc_dev_add(struct esas2r_adapter *a,
				struct esas2r_request *rq);
static bool esas2r_disc_dev_remove(struct esas2r_adapter *a,
				   struct esas2r_request *rq);
static bool esas2r_disc_part_info(struct esas2r_adapter *a,
				  struct esas2r_request *rq);
static void esas2r_disc_part_info_cb(struct esas2r_adapter *a,
				     struct esas2r_request *rq);
static bool esas2r_disc_passthru_dev_info(struct esas2r_adapter *a,
					  struct esas2r_request *rq);
static void esas2r_disc_passthru_dev_info_cb(struct esas2r_adapter *a,
					     struct esas2r_request *rq);
static bool esas2r_disc_passthru_dev_addr(struct esas2r_adapter *a,
					  struct esas2r_request *rq);
static void esas2r_disc_passthru_dev_addr_cb(struct esas2r_adapter *a,
					     struct esas2r_request *rq);
static bool esas2r_disc_raid_grp_info(struct esas2r_adapter *a,
				      struct esas2r_request *rq);
static void esas2r_disc_raid_grp_info_cb(struct esas2r_adapter *a,
					 struct esas2r_request *rq);

void esas2r_disc_initialize(struct esas2r_adapter *a)
{
	struct esas2r_sas_nvram *nvr = a->nvram;

	esas2r_trace_enter();

	clear_bit(AF_DISC_IN_PROG, &a->flags);
	clear_bit(AF2_DEV_SCAN, &a->flags2);
	clear_bit(AF2_DEV_CNT_OK, &a->flags2);

	a->disc_start_time = jiffies_to_msecs(jiffies);
	a->disc_wait_time = nvr->dev_wait_time * 1000;
	a->disc_wait_cnt = nvr->dev_wait_count;

	if (a->disc_wait_cnt > ESAS2R_MAX_TARGETS)
		a->disc_wait_cnt