1 /*- 2 * This file is provided under a dual BSD/GPLv2 license. When using or 3 * redistributing this file, you may do so under either license. 4 * 5 * GPL LICENSE SUMMARY 6 * 7 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 21 * The full GNU General Public License is included in this distribution 22 * in the file called LICENSE.GPL. 23 * 24 * BSD LICENSE 25 * 26 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 27 * All rights reserved. 28 * 29 * Redistribution and use in source and binary forms, with or without 30 * modification, are permitted provided that the following conditions 31 * are met: 32 * 33 * * Redistributions of source code must retain the above copyright 34 * notice, this list of conditions and the following disclaimer. 35 * * Redistributions in binary form must reproduce the above copyright 36 * notice, this list of conditions and the following disclaimer in 37 * the documentation and/or other materials provided with the 38 * distribution. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 41 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 42 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 43 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 44 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 46 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 47 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 48 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 49 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 50 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 51 */ 52 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD$"); 55 56 /** 57 * @file 58 * 59 * @brief This file contains the protected interface structures, constants, 60 * and methods for the SCIF_SAS_STP_REMOTE_DEVICE object. 61 */ 62 63 #include <dev/isci/scil/scif_sas_stp_remote_device.h> 64 #include <dev/isci/scil/scif_sas_remote_device.h> 65 #include <dev/isci/scil/scif_sas_domain.h> 66 #include <dev/isci/scil/scif_sas_controller.h> 67 #include <dev/isci/scil/scif_sas_logger.h> 68 #include <dev/isci/scil/intel_sat.h> 69 70 /** 71 * @brief This method performs SATA/STP specific construction of the 72 * STP remote device object. 73 * 74 * @param[in] device This parameter specifies the STP remote device 75 * object to be constructed. 76 * 77 * @return none 78 */ 79 void scif_sas_stp_remote_device_construct( 80 SCIF_SAS_REMOTE_DEVICE_T * device 81 ) 82 { 83 sati_device_construct( 84 &device->protocol_device.stp_device.sati_device, 85 device->domain->controller->user_parameters.sas.is_sata_ncq_enabled, 86 (U8) device->domain->controller->user_parameters.sas.max_ncq_depth, 87 device->domain->controller->user_parameters.sas.ignore_fua 88 ); 89 90 device->protocol_device.stp_device.s_active = 0; 91 } 92 93 /** 94 * @brief This method attempts to allocate a valid NCQ tag from the list 95 * of available tags in the remote device. 96 * 97 * @todo Attempt to find a CLZ like instruction to optimize this routine 98 * down into a few instructions. I know there is one like it for IA. 99 * 100 * @param[in] fw_device This parameter specifies the remote device 101 * for which to allocate an available NCQ tag. 102 * 103 * @return Return an available NCQ tag. 104 * @retval 0-31 These values indicate an available tag was successfully 105 * allocated. 106 * @return SCIF_SAS_STP_INVALID_NCQ_TAG This value indicates that there are 107 * no available NCQ tags. 108 */ 109 U8 scif_sas_stp_remote_device_allocate_ncq_tag( 110 SCIF_SAS_REMOTE_DEVICE_T * fw_device 111 ) 112 { 113 U8 ncq_tag = 0; 114 U32 tag_mask = 1; 115 116 SCIF_LOG_TRACE(( 117 sci_base_object_get_logger(fw_device), 118 SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST, 119 "scif_sas_stp_remote_device_allocate_ncq_tag(0x%x)\n", 120 fw_device 121 )); 122 123 // Try to find an unused NCQ tag. 124 while ( (fw_device->protocol_device.stp_device.s_active & tag_mask) 125 && (ncq_tag < fw_device->protocol_device.stp_device.sati_device.ncq_depth) ) 126 { 127 tag_mask <<= 1; 128 ncq_tag++; 129 } 130 131 // Check to see if we were able to find an available NCQ tag. 132 if (ncq_tag < fw_device->protocol_device.stp_device.sati_device.ncq_depth) 133 { 134 SCIF_LOG_INFO(( 135 sci_base_object_get_logger(fw_device), 136 SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST, 137 "RemoteDevice:0x%x NcqTag:0x%x successful NCQ TAG allocation\n", 138 fw_device, ncq_tag 139 )); 140 141 fw_device->protocol_device.stp_device.s_active |= tag_mask; 142 return ncq_tag; 143 } 144 145 SCIF_LOG_INFO(( 146 sci_base_object_get_logger(fw_device), 147 SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST, 148 "RemoteDevice:0x%x unable to allocate NCQ TAG\n", 149 fw_device 150 )); 151 152 // All NCQ tags are in use. 153 return SCIF_SAS_INVALID_NCQ_TAG; 154 } 155 156 /** 157 * @brief This method removes the specified tag from the list of 158 * outstanding tags. It doesn't return any values. 159 * 160 * @param[in] fw_device This parameter specifies the remote device for 161 * which to free an NCQ tag. 162 * @param[in] ncq_tag This parameter specifies the NCQ tag that is 163 * to be freed. 164 * 165 * @return none 166 */ 167 void scif_sas_stp_remote_device_free_ncq_tag( 168 struct SCIF_SAS_REMOTE_DEVICE * fw_device, 169 U8 ncq_tag 170 ) 171 { 172 SCIF_LOG_INFO(( 173 sci_base_object_get_logger(fw_device), 174 SCIF_LOG_OBJECT_REMOTE_DEVICE | SCIF_LOG_OBJECT_IO_REQUEST, 175 "RemoteDevice:0x%x NcqTag:0x%x freeing NCQ TAG\n", 176 fw_device, ncq_tag 177 )); 178 179 fw_device->protocol_device.stp_device.s_active &= ~(1 << ncq_tag); 180 } 181 182 struct SCIF_SAS_REQUEST * 183 scif_sas_stp_remote_device_get_request_by_ncq_tag( 184 struct SCIF_SAS_REMOTE_DEVICE * fw_device, 185 U8 ncq_tag 186 ) 187 { 188 SCIF_SAS_DOMAIN_T * fw_domain = fw_device->domain; 189 SCI_FAST_LIST_ELEMENT_T * pending_request_element; 190 SCIF_SAS_REQUEST_T * pending_request = NULL; 191 SCIF_SAS_REQUEST_T * matching_request = NULL; 192 193 pending_request_element = fw_domain->request_list.list_head; 194 195 while (pending_request_element != NULL) 196 { 197 pending_request = 198 (SCIF_SAS_REQUEST_T*) sci_fast_list_get_object(pending_request_element); 199 200 // The current element may be deleted from the list because of 201 // IO completion so advance to the next element early 202 pending_request_element = sci_fast_list_get_next(pending_request_element); 203 204 if ( 205 (pending_request->device == fw_device) && 206 (pending_request->stp.sequence.protocol == SAT_PROTOCOL_FPDMA) && 207 (pending_request->stp.ncq_tag == ncq_tag) 208 ) 209 { 210 matching_request = pending_request; 211 } 212 } 213 214 return matching_request; 215 } 216