/******************************************************************************* * Filename: target_core_tmr.c * * This file contains SPC-3 task management infrastructure * * Copyright (c) 2009,2010 Rising Tide Systems * Copyright (c) 2009,2010 Linux-iSCSI.org * * Nicholas A. Bellinger * * 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. * * 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 #include #include #include #include #include #include #include #include #include #include #include "target_core_alua.h" #include "target_core_pr.h" struct se_tmr_req *core_tmr_alloc_req( struct se_cmd *se_cmd, void *fabric_tmr_ptr, u8 function, gfp_t gfp_flags) { struct se_tmr_req *tmr; tmr = kmem_cache_zalloc(se_tmr_req_cache, gfp_flags); if (!tmr) { pr_err("Unable to allocate struct se_tmr_req\n"); return ERR_PTR(-ENOMEM); } tmr->task_cmd = se_cmd; tmr->fabric_tmr_ptr = fabric_tmr_ptr; tmr->function = function; INIT_LIST_HEAD(&tmr->tmr_list); return tmr; } EXPORT_SYMBOL(core_tmr_alloc_req); void core_tmr_release_req( struct se_tmr_req *tmr) { struct se_device *dev = tmr->tmr_dev; unsigned long flags; if (!dev) { kmem_cache_free(se_tmr_req_cache, tmr); return; } spin_lock_irqsave(&dev->se_tmr_lock, flags); list_del(&tmr->tmr_list); spin_unlock_irqrestore(&dev->se_tmr_lock, flags); kmem_cache_free(se_tmr_req_cache, tmr); } static void core_tmr_handle_tas_abort( struct se_node_acl *tmr_nacl, struct se_cmd *cmd, int tas, int fe_count) { if (!fe_count) { transport_cmd_finish_abort(cmd, 1); return; } /* * TASK ABORTED status (TAS) bit support */ if ((tmr_nacl && (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) transport_send_task_abort(cmd); transport_cmd_finish_abort(cmd, 0); } static void core_tmr_drain_tmr_list( struct se_device *dev, struct se_tmr_req *tmr, struct list_head *preempt_and_abort_list) { LIST_HEAD(drain_tmr_list); struct se_tmr_req *tmr_p, *tmr_pp; struct se_cmd *cmd; unsigned long flags; /* * Release all pending and outgoing TMRs aside from the received * LUN_RESET tmr.. */ spin_lock_irqsave(&dev->se_tmr_lock, flags); list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { /* * Allow the received TMR to return with FUNCTION_COMPLETE. */ if (tmr_p == tmr) continue; cmd = tmr_p->task_cmd; if (!cmd) { pr_err("Unable to locate struct se_cmd for TMR\n"); continue; } /* * If this function was called with a valid pr_res_key * parameter (eg: for PROUT PREEMPT_AND_ABORT service action * skip non regisration key matching TMRs. */ if (preempt_and_abort_list && (core_scsi3_check_cdb_abort_and_preempt( preempt_and_abort_list, cmd) != 0)) continue; spin_lock(&cmd->t_state_lock); if (!atomic_read(&cmd->t_transport_active)) { spin_unlock(&cmd->t_state_lock); continue; } if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { spin_unlock(&cmd->t_state_lock); continue; } spin_unlock(&cmd->t_state_lock); list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); } spin_unlock_irqrestore(&dev->se_tmr_lock, flags); list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { list_del_init(&tmr_p->tmr_list); cmd = tmr_p->task_cmd; pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," " Response: 0x%02x, t_state: %d\n", (preempt_and_abort_list) ? "Preempt" : "", tmr_p, tmr_p->function, tmr_p->response, cmd->t_state); transport_cmd_finish_abort(cmd, 1); } } static void core_tmr_drain_task_list( struct se_device *dev, struct se_cmd *prout_cmd, struct se_node_acl *tmr_nacl, int tas, struct list_head *preempt_and_abort_list) { LIST_HEAD(drain_task_list); struct se_cmd *cmd; struct se_task *task, *task_tmp; unsigned long flags; int fe_count; /* * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. * This is following sam4r17, section 5.6 Aborting commands, Table 38 * for TMR LUN_RESET: * * a) "Yes" indicates that each command that is aborted on an I_T nexus * other than the one that caused the SCSI device condition is * completed with TASK ABORTED status, if the TAS bit is set to one in * the Control mode page (see SPC-4). "No" indicates that no status is * returned for aborted commands. * * d) If the logical unit reset is caused by a particular I_T nexus * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" * (TASK_ABORTED status) applies. * * Otherwise (e.g., if triggered by a hard reset), "no" * (no TASK_ABORTED SAM status) applies. * * Note that this seems to be independent of TAS (Task Aborted Status) * in the Control Mode Page. */ spin_lock_irqsave(&dev->execute_task_lock, flags); list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, t_state_list) { if (!task->task_se_cmd) { pr_err("task->task_se_cmd is NULL!\n"); continue; } cmd = task->task_se_cmd; /* * For PREEMPT_AND_ABORT usage, only process commands * with a matching reservation key. */ if (preempt_and_abort_list && (core_scsi3_check_cdb_abort_and_preempt( preempt_and_abort_list, cmd) != 0)) continue; /* * Not aborting PROUT PREEMPT_AND_ABORT CDB.. */ if (prout_cmd == cmd) continue; list_move_tail(&task->t_state_list, &drain_task_list); atomic_set(&task->task_state_active, 0); /* * Remove from task execute list before processing drain_task_list */ if (!list_empty(&task->t_execute_list)) __transport_remove_task_from_execute_queue(task, dev); } spin_unlock_irqrestore(&dev->execute_task_lock, flags); while (!list_empty(&drain_task_list)) { task = list_entry(drain_task_list.next, struct se_task, t_state_list); list_del(&task->t_state_list); cmd = task->task_se_cmd; pr_debug("LUN_RESET: %s cmd: %p task: %p" " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" "cdb: 0x%02x\n", (preempt_and_abort_list) ? "Preempt" : "", cmd, task, cmd->se_tfo->get_task_tag(cmd), 0, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, cmd->t_task_cdb[0]); pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" " t_task_cdbs: %d t_task_cdbs_left: %d" " t_task_cdbs_sent: %d -- t_transport_active: %d" " t_transport_stop: %d t_transport_sent: %d\n", cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, cmd->t_task_list_num, atomic_read(&cmd->t_task_cdbs_left), atomic_read(&cmd->t_task_cdbs_sent), atomic_read(&cmd->t_transport_active), atomic_read(&cmd->t_transport_stop), atomic_read(&cmd->t_transport_sent)); /* * If the command may be queued onto a workqueue cancel it now. * * This is equivalent to removal from the execute queue in the * loop above, but we do it down here given that * cancel_work_sync may block. */ if (cmd->t_state == TRANSPORT_COMPLETE) cancel_work_sync(&cmd->work); spin_lock_irqsave(&cmd->t_state_lock, flags); target_stop_task(task, &flags); if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) { spin_unlock_irqrestore(&cmd->t_state_lock, flags); pr_debug("LUN_RESET: Skipping task: %p, dev: %p for" " t_task_cdbs_ex_left: %d\n", task, dev, atomic_read(&cmd->t_task_cdbs_ex_left)); continue; } fe_count = atomic_read(&cmd->t_fe_count); if (atomic_read(&cmd->t_transport_active)) { pr_debug("LUN_RESET: got t_transport_active = 1 for" " task: %p, t_fe_count: %d dev: %p\n", task, fe_count, dev); atomic_set(&cmd->t_transport_aborted, 1); spin_unlock_irqrestore(&cmd->t_state_lock, flags); core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); continue; } pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p," " t_fe_count: %d dev: %p\n", task, fe_count, dev); atomic_set(&cmd->t_transport_aborted, 1); spin_unlock_irqrestore(&cmd->t_state_lock, flags); core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); } } static void core_tmr_drain_cmd_list( struct se_device *dev, struct se_cmd *prout_cmd, struct se_node_acl *tmr_nacl, int tas, struct list_head *preempt_and_abort_list) { LIST_HEAD(drain_cmd_list); struct se_queue_obj *qobj = &dev->dev_queue_obj; struct se_cmd *cmd, *tcmd; unsigned long flags; /* * Release all commands remaining in the struct se_device cmd queue. * * This follows the same logic as above for the struct se_device * struct se_task state list, where commands are returned with * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD * reference, otherwise the struct se_cmd is released. */ spin_lock_irqsave(&qobj->cmd_queue_lock, flags); list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) { /* * For PREEMPT_AND_ABORT usage, only process commands * with a matching reservation key. */ if (preempt_and_abort_list && (core_scsi3_check_cdb_abort_and_preempt( preempt_and_abort_list, cmd) != 0)) continue; /* * Not aborting PROUT PREEMPT_AND_ABORT CDB.. */ if (prout_cmd == cmd) continue; /* * Skip direct processing of TRANSPORT_FREE_CMD_INTR for * HW target mode fabrics. */ spin_lock(&cmd->t_state_lock); if (cmd->t_state == TRANSPORT_FREE_CMD_INTR) { spin_unlock(&cmd->t_state_lock); continue; } spin_unlock(&cmd->t_state_lock); atomic_set(&cmd->t_transport_queue_active, 0); atomic_dec(&qobj->queue_cnt); list_move_tail(&cmd->se_queue_node, &drain_cmd_list); } spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); while (!list_empty(&drain_cmd_list)) { cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node); list_del_init(&cmd->se_queue_node); pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:" " %d t_fe_count: %d\n", (preempt_and_abort_list) ? "Preempt" : "", cmd, cmd->t_state, atomic_read(&cmd->t_fe_count)); /* * Signal that the command has failed via cmd->se_cmd_flags, */ transport_new_cmd_failure(cmd); core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, atomic_read(&cmd->t_fe_count)); } } int core_tmr_lun_reset( struct se_device *dev, struct se_tmr_req *tmr, struct list_head *preempt_and_abort_list, struct se_cmd *prout_cmd) { struct se_node_acl *tmr_nacl = NULL; struct se_portal_group *tmr_tpg = NULL; int tas; /* * TASK_ABORTED status bit, this is configurable via ConfigFS * struct se_device attributes. spc4r17 section 7.4.6 Control mode page * * A task aborted status (TAS) bit set to zero specifies that aborted * tasks shall be terminated by the device server without any response * to the application client. A TAS bit set to one specifies that tasks * aborted by the actions of an I_T nexus other than the I_T nexus on * which the command was received shall be completed with TASK ABORTED * status (see SAM-4). */ tas = dev->se_sub_dev->se_dev_attrib.emulate_tas; /* * Determine if this se_tmr is coming from a $FABRIC_MOD * or struct se_device passthrough.. */ if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; tmr_tpg = tmr->task_cmd->se_sess->se_tpg; if (tmr_nacl && tmr_tpg) { pr_debug("LUN_RESET: TMR caller fabric: %s" " initiator port %s\n", tmr_tpg->se_tpg_tfo->get_fabric_name(), tmr_nacl->initiatorname); } } pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", (preempt_and_abort_list) ? "Preempt" : "TMR", dev->transport->name, tas); core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas, preempt_and_abort_list); core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas, preempt_and_abort_list); /* * Clear any legacy SPC-2 reservation when called during * LOGICAL UNIT RESET */ if (!preempt_and_abort_list && (dev->dev_flags & DF_SPC2_RESERVATIONS)) { spin_lock(&dev->dev_reservation_lock); dev->dev_reserved_node_acl = NULL; dev->dev_flags &= ~DF_SPC2_RESERVATIONS; spin_unlock(&dev->dev_reservation_lock); pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); } spin_lock_irq(&dev->stats_lock); dev->num_resets++; spin_unlock_irq(&dev->stats_lock); pr_debug("LUN_RESET: %s for [%s] Complete\n", (preempt_and_abort_list) ? "Preempt" : "TMR", dev->transport->name); return 0; }