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 | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 121 | static void core_tmr_drain_tmr_list( |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 122 | struct se_device *dev, |
| 123 | struct se_tmr_req *tmr, |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 124 | struct list_head *preempt_and_abort_list) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 125 | { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 126 | LIST_HEAD(drain_tmr_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 127 | struct se_tmr_req *tmr_p, *tmr_pp; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 128 | struct se_cmd *cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 129 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 130 | /* |
| 131 | * Release all pending and outgoing TMRs aside from the received |
| 132 | * LUN_RESET tmr.. |
| 133 | */ |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 134 | spin_lock_irqsave(&dev->se_tmr_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 135 | list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { |
| 136 | /* |
| 137 | * Allow the received TMR to return with FUNCTION_COMPLETE. |
| 138 | */ |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 139 | if (tmr_p == tmr) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 140 | continue; |
| 141 | |
| 142 | cmd = tmr_p->task_cmd; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 143 | if (!cmd) { |
| 144 | pr_err("Unable to locate struct se_cmd for TMR\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 145 | continue; |
| 146 | } |
| 147 | /* |
| 148 | * If this function was called with a valid pr_res_key |
| 149 | * parameter (eg: for PROUT PREEMPT_AND_ABORT service action |
| 150 | * skip non regisration key matching TMRs. |
| 151 | */ |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 152 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 153 | continue; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 154 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 155 | spin_lock(&cmd->t_state_lock); |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 156 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 157 | spin_unlock(&cmd->t_state_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 158 | continue; |
| 159 | } |
| 160 | if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 161 | spin_unlock(&cmd->t_state_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 162 | continue; |
| 163 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 164 | spin_unlock(&cmd->t_state_lock); |
| 165 | |
Joern Engel | 6eb40b2 | 2011-10-26 13:37:56 -0700 | [diff] [blame] | 166 | list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 167 | } |
| 168 | spin_unlock_irqrestore(&dev->se_tmr_lock, flags); |
| 169 | |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 170 | 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] | 171 | list_del_init(&tmr_p->tmr_list); |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 172 | cmd = tmr_p->task_cmd; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 173 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 174 | pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 175 | " Response: 0x%02x, t_state: %d\n", |
Joern Engel | abc1fd4 | 2011-10-26 14:22:19 -0700 | [diff] [blame] | 176 | (preempt_and_abort_list) ? "Preempt" : "", tmr_p, |
| 177 | tmr_p->function, tmr_p->response, cmd->t_state); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 178 | |
Nicholas Bellinger | 8dc52b5 | 2011-10-09 02:02:51 -0700 | [diff] [blame] | 179 | transport_cmd_finish_abort(cmd, 1); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 180 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | static void core_tmr_drain_task_list( |
| 184 | struct se_device *dev, |
| 185 | struct se_cmd *prout_cmd, |
| 186 | struct se_node_acl *tmr_nacl, |
| 187 | int tas, |
| 188 | struct list_head *preempt_and_abort_list) |
| 189 | { |
| 190 | LIST_HEAD(drain_task_list); |
| 191 | struct se_cmd *cmd; |
| 192 | struct se_task *task, *task_tmp; |
| 193 | unsigned long flags; |
| 194 | int fe_count; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 195 | /* |
| 196 | * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. |
| 197 | * This is following sam4r17, section 5.6 Aborting commands, Table 38 |
| 198 | * for TMR LUN_RESET: |
| 199 | * |
| 200 | * a) "Yes" indicates that each command that is aborted on an I_T nexus |
| 201 | * other than the one that caused the SCSI device condition is |
| 202 | * completed with TASK ABORTED status, if the TAS bit is set to one in |
| 203 | * the Control mode page (see SPC-4). "No" indicates that no status is |
| 204 | * returned for aborted commands. |
| 205 | * |
| 206 | * d) If the logical unit reset is caused by a particular I_T nexus |
| 207 | * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" |
| 208 | * (TASK_ABORTED status) applies. |
| 209 | * |
| 210 | * Otherwise (e.g., if triggered by a hard reset), "no" |
| 211 | * (no TASK_ABORTED SAM status) applies. |
| 212 | * |
| 213 | * Note that this seems to be independent of TAS (Task Aborted Status) |
| 214 | * in the Control Mode Page. |
| 215 | */ |
| 216 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 217 | list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, |
| 218 | t_state_list) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 219 | if (!task->task_se_cmd) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 220 | pr_err("task->task_se_cmd is NULL!\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 221 | continue; |
| 222 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 223 | cmd = task->task_se_cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 224 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 225 | /* |
| 226 | * For PREEMPT_AND_ABORT usage, only process commands |
| 227 | * with a matching reservation key. |
| 228 | */ |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 229 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 230 | continue; |
| 231 | /* |
| 232 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. |
| 233 | */ |
| 234 | if (prout_cmd == cmd) |
| 235 | continue; |
| 236 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 237 | list_move_tail(&task->t_state_list, &drain_task_list); |
Christoph Hellwig | 1880807a | 2011-11-23 06:54:36 -0500 | [diff] [blame] | 238 | task->t_state_active = false; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 239 | /* |
| 240 | * Remove from task execute list before processing drain_task_list |
| 241 | */ |
Christoph Hellwig | 04629b7 | 2011-10-12 11:07:04 -0400 | [diff] [blame] | 242 | if (!list_empty(&task->t_execute_list)) |
| 243 | __transport_remove_task_from_execute_queue(task, dev); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 244 | } |
| 245 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 246 | |
| 247 | while (!list_empty(&drain_task_list)) { |
| 248 | task = list_entry(drain_task_list.next, struct se_task, t_state_list); |
| 249 | list_del(&task->t_state_list); |
| 250 | cmd = task->task_se_cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 251 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 252 | pr_debug("LUN_RESET: %s cmd: %p task: %p" |
Christoph Hellwig | f2da9db | 2011-10-17 13:56:51 -0400 | [diff] [blame] | 253 | " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" |
| 254 | "cdb: 0x%02x\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 255 | (preempt_and_abort_list) ? "Preempt" : "", cmd, task, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 256 | cmd->se_tfo->get_task_tag(cmd), 0, |
| 257 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, |
Christoph Hellwig | f2da9db | 2011-10-17 13:56:51 -0400 | [diff] [blame] | 258 | cmd->t_task_cdb[0]); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 259 | pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 260 | " t_task_cdbs: %d t_task_cdbs_left: %d" |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 261 | " t_task_cdbs_sent: %d -- CMD_T_ACTIVE: %d" |
| 262 | " CMD_T_STOP: %d CMD_T_SENT: %d\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 263 | cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 264 | cmd->t_task_list_num, |
| 265 | atomic_read(&cmd->t_task_cdbs_left), |
| 266 | atomic_read(&cmd->t_task_cdbs_sent), |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 267 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
| 268 | (cmd->transport_state & CMD_T_STOP) != 0, |
| 269 | (cmd->transport_state & CMD_T_SENT) != 0); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 270 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 271 | /* |
| 272 | * If the command may be queued onto a workqueue cancel it now. |
| 273 | * |
| 274 | * This is equivalent to removal from the execute queue in the |
| 275 | * loop above, but we do it down here given that |
| 276 | * cancel_work_sync may block. |
| 277 | */ |
| 278 | if (cmd->t_state == TRANSPORT_COMPLETE) |
| 279 | cancel_work_sync(&cmd->work); |
| 280 | |
Christoph Hellwig | cdbb70b | 2011-10-17 13:56:46 -0400 | [diff] [blame] | 281 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 282 | target_stop_task(task, &flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 283 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 284 | if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) { |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 285 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 286 | pr_debug("LUN_RESET: Skipping task: %p, dev: %p for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 287 | " t_task_cdbs_ex_left: %d\n", task, dev, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 288 | atomic_read(&cmd->t_task_cdbs_ex_left)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 289 | continue; |
| 290 | } |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 291 | fe_count = atomic_read(&cmd->t_fe_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 292 | |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 293 | if (!(cmd->transport_state & CMD_T_ACTIVE)) { |
| 294 | pr_debug("LUN_RESET: got CMD_T_ACTIVE for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 295 | " task: %p, t_fe_count: %d dev: %p\n", task, |
| 296 | fe_count, dev); |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 297 | cmd->transport_state |= CMD_T_ABORTED; |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 298 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 299 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 300 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 301 | continue; |
| 302 | } |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 303 | pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for task: %p," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 304 | " t_fe_count: %d dev: %p\n", task, fe_count, dev); |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 305 | cmd->transport_state |= CMD_T_ABORTED; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 306 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 307 | |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 308 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 309 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | static void core_tmr_drain_cmd_list( |
| 313 | struct se_device *dev, |
| 314 | struct se_cmd *prout_cmd, |
| 315 | struct se_node_acl *tmr_nacl, |
| 316 | int tas, |
| 317 | struct list_head *preempt_and_abort_list) |
| 318 | { |
| 319 | LIST_HEAD(drain_cmd_list); |
| 320 | struct se_queue_obj *qobj = &dev->dev_queue_obj; |
| 321 | struct se_cmd *cmd, *tcmd; |
| 322 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 323 | /* |
| 324 | * Release all commands remaining in the struct se_device cmd queue. |
| 325 | * |
| 326 | * This follows the same logic as above for the struct se_device |
| 327 | * struct se_task state list, where commands are returned with |
| 328 | * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD |
| 329 | * reference, otherwise the struct se_cmd is released. |
| 330 | */ |
| 331 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 332 | 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] | 333 | /* |
| 334 | * For PREEMPT_AND_ABORT usage, only process commands |
| 335 | * with a matching reservation key. |
| 336 | */ |
Jörn Engel | feae856 | 2011-11-24 02:05:12 +0100 | [diff] [blame] | 337 | if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 338 | continue; |
| 339 | /* |
| 340 | * Not aborting PROUT PREEMPT_AND_ABORT CDB.. |
| 341 | */ |
| 342 | if (prout_cmd == cmd) |
| 343 | continue; |
| 344 | |
Christoph Hellwig | 7d680f3 | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 345 | cmd->transport_state &= ~CMD_T_QUEUED; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 346 | atomic_dec(&qobj->queue_cnt); |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 347 | list_move_tail(&cmd->se_queue_node, &drain_cmd_list); |
| 348 | } |
| 349 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 350 | |
| 351 | while (!list_empty(&drain_cmd_list)) { |
| 352 | 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] | 353 | list_del_init(&cmd->se_queue_node); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 354 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 355 | pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 356 | " %d t_fe_count: %d\n", (preempt_and_abort_list) ? |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 357 | "Preempt" : "", cmd, cmd->t_state, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 358 | atomic_read(&cmd->t_fe_count)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 359 | |
| 360 | core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 361 | atomic_read(&cmd->t_fe_count)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 362 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | int core_tmr_lun_reset( |
| 366 | struct se_device *dev, |
| 367 | struct se_tmr_req *tmr, |
| 368 | struct list_head *preempt_and_abort_list, |
| 369 | struct se_cmd *prout_cmd) |
| 370 | { |
| 371 | struct se_node_acl *tmr_nacl = NULL; |
| 372 | struct se_portal_group *tmr_tpg = NULL; |
| 373 | int tas; |
| 374 | /* |
| 375 | * TASK_ABORTED status bit, this is configurable via ConfigFS |
| 376 | * struct se_device attributes. spc4r17 section 7.4.6 Control mode page |
| 377 | * |
| 378 | * A task aborted status (TAS) bit set to zero specifies that aborted |
| 379 | * tasks shall be terminated by the device server without any response |
| 380 | * to the application client. A TAS bit set to one specifies that tasks |
| 381 | * aborted by the actions of an I_T nexus other than the I_T nexus on |
| 382 | * which the command was received shall be completed with TASK ABORTED |
| 383 | * status (see SAM-4). |
| 384 | */ |
| 385 | tas = dev->se_sub_dev->se_dev_attrib.emulate_tas; |
| 386 | /* |
| 387 | * Determine if this se_tmr is coming from a $FABRIC_MOD |
| 388 | * or struct se_device passthrough.. |
| 389 | */ |
| 390 | if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { |
| 391 | tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; |
| 392 | tmr_tpg = tmr->task_cmd->se_sess->se_tpg; |
| 393 | if (tmr_nacl && tmr_tpg) { |
| 394 | pr_debug("LUN_RESET: TMR caller fabric: %s" |
| 395 | " initiator port %s\n", |
| 396 | tmr_tpg->se_tpg_tfo->get_fabric_name(), |
| 397 | tmr_nacl->initiatorname); |
| 398 | } |
| 399 | } |
| 400 | pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", |
| 401 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
| 402 | dev->transport->name, tas); |
| 403 | |
| 404 | core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); |
| 405 | core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas, |
| 406 | preempt_and_abort_list); |
| 407 | core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas, |
| 408 | preempt_and_abort_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 409 | /* |
| 410 | * Clear any legacy SPC-2 reservation when called during |
| 411 | * LOGICAL UNIT RESET |
| 412 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 413 | if (!preempt_and_abort_list && |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 414 | (dev->dev_flags & DF_SPC2_RESERVATIONS)) { |
| 415 | spin_lock(&dev->dev_reservation_lock); |
| 416 | dev->dev_reserved_node_acl = NULL; |
| 417 | dev->dev_flags &= ~DF_SPC2_RESERVATIONS; |
| 418 | spin_unlock(&dev->dev_reservation_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 419 | pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 420 | } |
| 421 | |
Nicholas Bellinger | 1e7de68 | 2011-05-19 20:19:10 -0700 | [diff] [blame] | 422 | spin_lock_irq(&dev->stats_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 423 | dev->num_resets++; |
Nicholas Bellinger | 1e7de68 | 2011-05-19 20:19:10 -0700 | [diff] [blame] | 424 | spin_unlock_irq(&dev->stats_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 425 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 426 | pr_debug("LUN_RESET: %s for [%s] Complete\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 427 | (preempt_and_abort_list) ? "Preempt" : "TMR", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 428 | dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 429 | return 0; |
| 430 | } |
Nicholas Bellinger | d050ffb | 2011-09-28 21:37:29 -0700 | [diff] [blame] | 431 | |