Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_tmr.c |
| 3 | * |
| 4 | * This file contains SPC-3 task management infrastructure |
| 5 | * |
| 6 | * Copyright (c) 2009,2010 Rising Tide Systems |
| 7 | * Copyright (c) 2009,2010 Linux-iSCSI.org |
| 8 | * |
| 9 | * Nicholas A. Bellinger <nab@kernel.org> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 24 | * |
| 25 | ******************************************************************************/ |
| 26 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 27 | #include <linux/slab.h> |
| 28 | #include <linux/spinlock.h> |
| 29 | #include <linux/list.h> |
Paul Gortmaker | c53181a | 2011-08-30 18:16:43 -0400 | [diff] [blame] | 30 | #include <linux/export.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 31 | #include <scsi/scsi.h> |
| 32 | #include <scsi/scsi_cmnd.h> |
| 33 | |
| 34 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 35 | #include <target/target_core_backend.h> |
| 36 | #include <target/target_core_fabric.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 37 | #include <target/target_core_configfs.h> |
| 38 | |
Christoph Hellwig | e26d99a | 2011-11-14 12:30:30 -0500 | [diff] [blame] | 39 | #include "target_core_internal.h" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 40 | #include "target_core_alua.h" |
| 41 | #include "target_core_pr.h" |
| 42 | |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 43 | int core_tmr_alloc_req( |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 44 | struct se_cmd *se_cmd, |
| 45 | void *fabric_tmr_ptr, |
Roland Dreier | dd503a5 | 2011-10-06 09:56:16 -0700 | [diff] [blame] | 46 | u8 function, |
| 47 | gfp_t gfp_flags) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 48 | { |
| 49 | struct se_tmr_req *tmr; |
| 50 | |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 51 | tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 52 | if (!tmr) { |
| 53 | pr_err("Unable to allocate struct se_tmr_req\n"); |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 54 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 55 | } |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 56 | |
| 57 | se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; |
| 58 | se_cmd->se_tmr_req = tmr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 59 | tmr->task_cmd = se_cmd; |
| 60 | tmr->fabric_tmr_ptr = fabric_tmr_ptr; |
| 61 | tmr->function = function; |
| 62 | INIT_LIST_HEAD(&tmr->tmr_list); |
| 63 | |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 64 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | } |
| 66 | EXPORT_SYMBOL(core_tmr_alloc_req); |
| 67 | |
| 68 | void core_tmr_release_req( |
| 69 | struct se_tmr_req *tmr) |
| 70 | { |
| 71 | struct se_device *dev = tmr->tmr_dev; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 72 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 73 | |
Nicholas Bellinger | 7fd29aa | 2011-06-23 23:48:32 +0000 | [diff] [blame] | 74 | if (!dev) { |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 75 | kfree(tmr); |
Nicholas Bellinger | 7fd29aa | 2011-06-23 23:48:32 +0000 | [diff] [blame] | 76 | return; |
| 77 | } |
| 78 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 79 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 80 | list_del(&tmr->tmr_list); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 81 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
Nicholas Bellinger | 7fd29aa | 2011-06-23 23:48:32 +0000 | [diff] [blame] | 82 | |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 83 | kfree(tmr); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static void core_tmr_handle_tas_abort( |
| 87 | struct se_node_acl *tmr_nacl, |
| 88 | struct se_cmd *cmd, |
| 89 | int tas, |
| 90 | int fe_count) |
| 91 | { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 92 | if (!fe_count) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 93 | transport_cmd_finish_abort(cmd, 1); |
| 94 | return; |
| 95 | } |
| 96 | /* |
| 97 | * TASK ABORTED status (TAS) bit support |
| 98 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 99 | if ((tmr_nacl && |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 100 | (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) |
| 101 | transport_send_task_abort(cmd); |
| 102 | |
| 103 | transport_cmd_finish_abort(cmd, 0); |
| 104 | } |
| 105 | |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 106 | static int target_check_cdb_and_preempt(struct list_head *list, |
| 107 | struct se_cmd *cmd) |
Jörn Engel | c165f69 | 2011-11-24 02:04:42 +0100 | [diff] [blame] | 108 | { |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 109 | struct t10_pr_registration *reg; |
Jörn Engel | c165f69 | 2011-11-24 02:04:42 +0100 | [diff] [blame] | 110 | |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 111 | if (!list) |
| 112 | return 0; |
| 113 | list_for_each_entry(reg, list, pr_reg_abort_list) { |
| 114 | if (reg->pr_res_key == cmd->pr_res_key) |
Jörn Engel | c165f69 | 2011-11-24 02:04:42 +0100 | [diff] [blame] | 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | return 1; |
| 119 | } |
| 120 | |
Nicholas Bellinger | 3d28934 | 2012-02-13 02:38:14 -0800 | [diff] [blame^] | 121 | void core_tmr_abort_task( |
| 122 | struct se_device *dev, |
| 123 | struct se_tmr_req *tmr, |
| 124 | struct se_session *se_sess) |
| 125 | { |
| 126 | struct se_cmd *se_cmd, *tmp_cmd; |
| 127 | unsigned long flags; |
| 128 | int ref_tag; |
| 129 | |
| 130 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
| 131 | list_for_each_entry_safe(se_cmd, tmp_cmd, |
| 132 | &se_sess->sess_cmd_list, se_cmd_list) { |
| 133 | |
| 134 | if (dev != se_cmd->se_dev) |
| 135 | continue; |
| 136 | ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd); |
| 137 | if (tmr->ref_task_tag != ref_tag) |
| 138 | continue; |
| 139 | |
| 140 | printk("ABORT_TASK: Found referenced %s task_tag: %u\n", |
| 141 | se_cmd->se_tfo->get_fabric_name(), ref_tag); |
| 142 | |
| 143 | spin_lock_irq(&se_cmd->t_state_lock); |
| 144 | if (se_cmd->transport_state & CMD_T_COMPLETE) { |
| 145 | printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag); |
| 146 | spin_unlock_irq(&se_cmd->t_state_lock); |
| 147 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 148 | goto out; |
| 149 | } |
| 150 | se_cmd->transport_state |= CMD_T_ABORTED; |
| 151 | spin_unlock_irq(&se_cmd->t_state_lock); |
| 152 | |
| 153 | list_del_init(&se_cmd->se_cmd_list); |
| 154 | kref_get(&se_cmd->cmd_kref); |
| 155 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 156 | |
| 157 | cancel_work_sync(&se_cmd->work); |
| 158 | transport_wait_for_tasks(se_cmd); |
| 159 | /* |
| 160 | * Now send SAM_STAT_TASK_ABORTED status for the referenced |
| 161 | * se_cmd descriptor.. |
| 162 | */ |
| 163 | transport_send_task_abort(se_cmd); |
| 164 | /* |
| 165 | * Also deal with possible extra acknowledge reference.. |
| 166 | */ |
| 167 | if (se_cmd->se_cmd_flags & SCF_ACK_KREF) |
| 168 | target_put_sess_cmd(se_sess, se_cmd); |
| 169 | |
| 170 | target_put_sess_cmd(se_sess, se_cmd); |
| 171 | |
| 172 | printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" |
| 173 | " ref_tag: %d\n", ref_tag); |
| 174 | tmr->response = TMR_FUNCTION_COMPLETE; |
| 175 | return; |
| 176 | } |
| 177 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 178 | |
| 179 | out: |
| 180 | printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n", |
| 181 | tmr->ref_task_tag); |
| 182 | tmr->response = TMR_TASK_DOES_NOT_EXIST; |
| 183 | } |
| 184 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 185 | static void core_tmr_drain_tmr_list( |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 186 | struct se_device *dev, |
| 187 | struct se_tmr_req *tmr, |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 188 | struct list_head *preempt_and_abort_list) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 189 | { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 190 | LIST_HEAD(drain_tmr_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 191 | struct se_tmr_req *tmr_p, *tmr_pp; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 192 | struct se_cmd *cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 193 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 194 | /* |
| 195 | * Release all pending and outgoing TMRs aside from the received |
| 196 | * LUN_RESET tmr.. |
| 197 | */ |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 198 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 199 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
| 200 | /* |
| 201 | * Allow the received TMR to return with FUNCTION_COMPLETE. |
| 202 | */ |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 203 | if (tmr_p == tmr) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 204 | continue; |
| 205 | |
| 206 | cmd = tmr_p->task_cmd; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 207 | if (!cmd) { |
| 208 | pr_err("Unable to locate struct se_cmd for TMR\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 209 | continue; |
| 210 | } |
| 211 | /* |
| 212 | * If this function was called with a valid pr_res_key |
| 213 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action |
| 214 | * skip non regisration key matching TMRs. |
| 215 | */ |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 216 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 217 | continue; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 218 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 219 | spin_lock(&cmd->t_state_lock); |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 220 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 221 | spin_unlock(&cmd->t_state_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 222 | continue; |
| 223 | } |
| 224 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 225 | spin_unlock(&cmd->t_state_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 226 | continue; |
| 227 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 228 | spin_unlock(&cmd->t_state_lock); |
| 229 | |
Joern Engel | 6eb40b2 | 2011-10-26 13:37:56 -0700 | [diff] [blame] | 230 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 231 | } |
| 232 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
| 233 | |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 234 | list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { |
Joern Engel | b8a11d7 | 2011-10-27 15:44:46 -0700 | [diff] [blame] | 235 | list_del_init(&tmr_p->tmr_list); |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 236 | cmd = tmr_p->task_cmd; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 237 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 238 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 239 | " Response: 0x%02x, t_state: %d\n", |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 240 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
| 241 | tmr_p->function, tmr_p->response, cmd->t_state); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 242 | |
Nicholas Bellinger | 8dc52b5 | 2011-10-09 02:02:51 -0700 | [diff] [blame] | 243 | transport_cmd_finish_abort(cmd, 1); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 244 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | static void core_tmr_drain_task_list( |
| 248 | struct se_device *dev, |
| 249 | struct se_cmd *prout_cmd, |
| 250 | struct se_node_acl *tmr_nacl, |
| 251 | int tas, |
| 252 | struct list_head *preempt_and_abort_list) |
| 253 | { |
| 254 | LIST_HEAD(drain_task_list); |
| 255 | struct se_cmd *cmd; |
| 256 | struct se_task *task, *task_tmp; |
| 257 | unsigned long flags; |
| 258 | int fe_count; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 259 | /* |
| 260 | * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. |
| 261 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
| 262 | * for TMR LUN_RESET: |
| 263 | * |
| 264 | * a) "Yes" indicates that each command that is aborted on an I_T nexus |
| 265 | * other than the one that caused the SCSI device condition is |
| 266 | * completed with TASK ABORTED status, if the TAS bit is set to one in |
| 267 | * the Control mode page (see SPC-4). "No" indicates that no status is |
| 268 | * returned for aborted commands. |
| 269 | * |
| 270 | * d) If the logical unit reset is caused by a particular I_T nexus |
| 271 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" |
| 272 | * (TASK_ABORTED status) applies. |
| 273 | * |
| 274 | * Otherwise (e.g., if triggered by a hard reset), "no" |
| 275 | * (no TASK_ABORTED SAM status) applies. |
| 276 | * |
| 277 | * Note that this seems to be independent of TAS (Task Aborted Status) |
| 278 | * in the Control Mode Page. |
| 279 | */ |
| 280 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 281 | list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, |
| 282 | t_state_list) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 283 | if (!task->task_se_cmd) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 284 | pr_err("task->task_se_cmd is NULL!\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 285 | continue; |
| 286 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 287 | cmd = task->task_se_cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 288 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 289 | /* |
| 290 | * For PREEMPT_AND_ABORT usage, only process commands |
| 291 | * with a matching reservation key. |
| 292 | */ |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 293 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 294 | continue; |
| 295 | /* |
| 296 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. |
| 297 | */ |
| 298 | if (prout_cmd == cmd) |
| 299 | continue; |
| 300 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 301 | list_move_tail(&task->t_state_list, &drain_task_list); |
Christoph Hellwig | 1880807a | 2011-11-23 06:54:36 -0500 | [diff] [blame] | 302 | task->t_state_active = false; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 303 | /* |
| 304 | * Remove from task execute list before processing drain_task_list |
| 305 | */ |
Christoph Hellwig | 04629b7 | 2011-10-12 11:07:04 -0400 | [diff] [blame] | 306 | if (!list_empty(&task->t_execute_list)) |
| 307 | __transport_remove_task_from_execute_queue(task, dev); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 308 | } |
| 309 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 310 | |
| 311 | while (!list_empty(&drain_task_list)) { |
| 312 | task = list_entry(drain_task_list.next, struct se_task, t_state_list); |
| 313 | list_del(&task->t_state_list); |
| 314 | cmd = task->task_se_cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 315 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 316 | pr_debug("LUN_RESET: %s cmd: %p task: %p" |
Christoph Hellwig | f2da9db | 2011-10-17 13:56:51 -0400 | [diff] [blame] | 317 | " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" |
| 318 | "cdb: 0x%02x\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 319 | (preempt_and_abort_list) ? "Preempt" : "", cmd, task, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 320 | cmd->se_tfo->get_task_tag(cmd), 0, |
| 321 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, |
Christoph Hellwig | f2da9db | 2011-10-17 13:56:51 -0400 | [diff] [blame] | 322 | cmd->t_task_cdb[0]); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 323 | pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 324 | " t_task_cdbs: %d t_task_cdbs_left: %d" |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 325 | " t_task_cdbs_sent: %d -- CMD_T_ACTIVE: %d" |
| 326 | " CMD_T_STOP: %d CMD_T_SENT: %d\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 327 | cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 328 | cmd->t_task_list_num, |
| 329 | atomic_read(&cmd->t_task_cdbs_left), |
| 330 | atomic_read(&cmd->t_task_cdbs_sent), |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 331 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
| 332 | (cmd->transport_state & CMD_T_STOP) != 0, |
| 333 | (cmd->transport_state & CMD_T_SENT) != 0); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 334 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 335 | /* |
| 336 | * If the command may be queued onto a workqueue cancel it now. |
| 337 | * |
| 338 | * This is equivalent to removal from the execute queue in the |
| 339 | * loop above, but we do it down here given that |
| 340 | * cancel_work_sync may block. |
| 341 | */ |
| 342 | if (cmd->t_state == TRANSPORT_COMPLETE) |
| 343 | cancel_work_sync(&cmd->work); |
| 344 | |
Christoph Hellwig | cdbb70b | 2011-10-17 13:56:46 -0400 | [diff] [blame] | 345 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 346 | target_stop_task(task, &flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 347 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 348 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 349 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 350 | pr_debug("LUN_RESET: Skipping task: %p, dev: %p for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 351 | " t_task_cdbs_ex_left: %d\n", task, dev, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 352 | atomic_read(&cmd->t_task_cdbs_ex_left)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 353 | continue; |
| 354 | } |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 355 | fe_count = atomic_read(&cmd->t_fe_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 356 | |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 357 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
| 358 | pr_debug("LUN_RESET: got CMD_T_ACTIVE for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 359 | " task: %p, t_fe_count: %d dev: %p\n", task, |
| 360 | fe_count, dev); |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 361 | cmd->transport_state |= CMD_T_ABORTED; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 362 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 363 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 364 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 365 | continue; |
| 366 | } |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 367 | pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for task: %p," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 368 | " t_fe_count: %d dev: %p\n", task, fe_count, dev); |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 369 | cmd->transport_state |= CMD_T_ABORTED; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 370 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 371 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 372 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 373 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | static void core_tmr_drain_cmd_list( |
| 377 | struct se_device *dev, |
| 378 | struct se_cmd *prout_cmd, |
| 379 | struct se_node_acl *tmr_nacl, |
| 380 | int tas, |
| 381 | struct list_head *preempt_and_abort_list) |
| 382 | { |
| 383 | LIST_HEAD(drain_cmd_list); |
| 384 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
| 385 | struct se_cmd *cmd, *tcmd; |
| 386 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 387 | /* |
| 388 | * Release all commands remaining in the struct se_device cmd queue. |
| 389 | * |
| 390 | * This follows the same logic as above for the struct se_device |
| 391 | * struct se_task state list, where commands are returned with |
| 392 | * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD |
| 393 | * reference, otherwise the struct se_cmd is released. |
| 394 | */ |
| 395 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 396 | list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 397 | /* |
| 398 | * For PREEMPT_AND_ABORT usage, only process commands |
| 399 | * with a matching reservation key. |
| 400 | */ |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 401 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 402 | continue; |
| 403 | /* |
| 404 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. |
| 405 | */ |
| 406 | if (prout_cmd == cmd) |
| 407 | continue; |
| 408 | |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 409 | cmd->transport_state &= ~CMD_T_QUEUED; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 410 | atomic_dec(&qobj->queue_cnt); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 411 | list_move_tail(&cmd->se_queue_node, &drain_cmd_list); |
| 412 | } |
| 413 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 414 | |
| 415 | while (!list_empty(&drain_cmd_list)) { |
| 416 | cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node); |
Roland Dreier | 79a7fef | 2011-09-28 22:12:07 -0700 | [diff] [blame] | 417 | list_del_init(&cmd->se_queue_node); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 418 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 419 | pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 420 | " %d t_fe_count: %d\n", (preempt_and_abort_list) ? |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 421 | "Preempt" : "", cmd, cmd->t_state, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 422 | atomic_read(&cmd->t_fe_count)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 423 | |
| 424 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 425 | atomic_read(&cmd->t_fe_count)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 426 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | int core_tmr_lun_reset( |
| 430 | struct se_device *dev, |
| 431 | struct se_tmr_req *tmr, |
| 432 | struct list_head *preempt_and_abort_list, |
| 433 | struct se_cmd *prout_cmd) |
| 434 | { |
| 435 | struct se_node_acl *tmr_nacl = NULL; |
| 436 | struct se_portal_group *tmr_tpg = NULL; |
| 437 | int tas; |
| 438 | /* |
| 439 | * TASK_ABORTED status bit, this is configurable via ConfigFS |
| 440 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page |
| 441 | * |
| 442 | * A task aborted status (TAS) bit set to zero specifies that aborted |
| 443 | * tasks shall be terminated by the device server without any response |
| 444 | * to the application client. A TAS bit set to one specifies that tasks |
| 445 | * aborted by the actions of an I_T nexus other than the I_T nexus on |
| 446 | * which the command was received shall be completed with TASK ABORTED |
| 447 | * status (see SAM-4). |
| 448 | */ |
| 449 | tas = dev->se_sub_dev->se_dev_attrib.emulate_tas; |
| 450 | /* |
| 451 | * Determine if this se_tmr is coming from a $FABRIC_MOD |
| 452 | * or struct se_device passthrough.. |
| 453 | */ |
| 454 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { |
| 455 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; |
| 456 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; |
| 457 | if (tmr_nacl && tmr_tpg) { |
| 458 | pr_debug("LUN_RESET: TMR caller fabric: %s" |
| 459 | " initiator port %s\n", |
| 460 | tmr_tpg->se_tpg_tfo->get_fabric_name(), |
| 461 | tmr_nacl->initiatorname); |
| 462 | } |
| 463 | } |
| 464 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", |
| 465 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
| 466 | dev->transport->name, tas); |
| 467 | |
| 468 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); |
| 469 | core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas, |
| 470 | preempt_and_abort_list); |
| 471 | core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas, |
| 472 | preempt_and_abort_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 473 | /* |
| 474 | * Clear any legacy SPC-2 reservation when called during |
| 475 | * LOGICAL UNIT RESET |
| 476 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 477 | if (!preempt_and_abort_list && |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 478 | (dev->dev_flags & DF_SPC2_RESERVATIONS)) { |
| 479 | spin_lock(&dev->dev_reservation_lock); |
| 480 | dev->dev_reserved_node_acl = NULL; |
| 481 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS; |
| 482 | spin_unlock(&dev->dev_reservation_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 483 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 484 | } |
| 485 | |
Nicholas Bellinger | 1e7de68 | 2011-05-19 20:19:10 -0700 | [diff] [blame] | 486 | spin_lock_irq(&dev->stats_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 487 | dev->num_resets++; |
Nicholas Bellinger | 1e7de68 | 2011-05-19 20:19:10 -0700 | [diff] [blame] | 488 | spin_unlock_irq(&dev->stats_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 489 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 490 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 491 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 492 | dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 493 | return 0; |
| 494 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 495 | |