esas2r_io.c | Explore in Territory

/*
 *  linux/drivers/scsi/esas2r/esas2r_io.c
 *      For use with ATTO ExpressSAS R6xx SAS/SATA RAID controllers
 *
 *  Copyright (c) 2001-2013 ATTO Technology, Inc.
 *  (mailto:[email protected])mpt3sas/mpt3sas_trigger_diag.
 *
 * 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#include "esas2r.h"

void esas2r_start_request(struct esas2r_adapter *a, struct esas2r_request *rq)
{ … }

/*
 * Starts the specified request.  all requests have RS_PENDING set when this
 * routine is called.  The caller is usually esas2r_start_request, but
 * esas2r_do_deferred_processes will start request that are deferred.
 *
 * The caller must ensure that requests can be started.
 *
 * esas2r_start_request will defer a request if there are already requests
 * waiting or there is a chip reset pending.  once the reset condition clears,
 * esas2r_do_deferred_processes will call this function to start the request.
 *
 * When a request is started, it is placed on the active list and queued to
 * the controller.
 */
void esas2r_local_start_request(struct esas2r_adapter *a,
				struct esas2r_request *rq)
{ … }

void esas2r_start_vda_request(struct esas2r_adapter *a,
			      struct esas2r_request *rq)
{ … }

/*
 * Build the scatter/gather list for an I/O request according to the
 * specifications placed in the s/g context.  The caller must initialize
 * context prior to the initial call by calling esas2r_sgc_init().
 */
bool esas2r_build_sg_list_sge(struct esas2r_adapter *a,
			      struct esas2r_sg_context *sgc)
{ … }


/*
 * Create PRD list for each I-block consumed by the command. This routine
 * determines how much data is required from each I-block being consumed
 * by the command. The first and last I-blocks can be partials and all of
 * the I-blocks in between are for a full I-block of data.
 *
 * The interleave size is used to determine the number of bytes in the 1st
 * I-block and the remaining I-blocks are what remeains.
 */
static bool esas2r_build_prd_iblk(struct esas2r_adapter *a,
				  struct esas2r_sg_context *sgc)
{ … }

bool esas2r_build_sg_list_prd(struct esas2r_adapter *a,
			      struct esas2r_sg_context *sgc)
{ … }

static void esas2r_handle_pending_reset(struct esas2r_adapter *a, u32 currtime)
{ … }


/* This function must be called once per timer tick */
void esas2r_timer_tick(struct esas2r_adapter *a)
{ … }

/*
 * Send the specified task management function to the target and LUN
 * specified in rqaux.  in addition, immediately abort any commands that
 * are queued but not sent to the device according to the rules specified
 * by the task management function.
 */
bool esas2r_send_task_mgmt(struct esas2r_adapter *a,
			   struct esas2r_request *rqaux, u8 task_mgt_func)
{ … }

void esas2r_reset_bus(struct esas2r_adapter *a)
{ … }

bool esas2r_ioreq_aborted(struct esas2r_adapter *a, struct esas2r_request *rq,
			  u8 status)
{ … }