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drivers/target/target_core_ua.c
8.27 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/******************************************************************************* * Filename: target_core_ua.c * * This file contains logic for SPC-3 Unit Attention emulation * |
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* (c) Copyright 2009-2013 Datera, Inc. |
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* * Nicholas A. Bellinger <nab@kernel.org> * |
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******************************************************************************/ |
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#include <linux/slab.h> #include <linux/spinlock.h> |
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#include <scsi/scsi_proto.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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#include "target_core_internal.h" |
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#include "target_core_alua.h" |
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#include "target_core_pr.h" #include "target_core_ua.h" |
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sense_reason_t target_scsi3_ua_check(struct se_cmd *cmd) |
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{ struct se_dev_entry *deve; struct se_session *sess = cmd->se_sess; struct se_node_acl *nacl; |
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if (!sess) |
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return 0; nacl = sess->se_node_acl; |
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if (!nacl) |
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return 0; |
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rcu_read_lock(); deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); if (!deve) { rcu_read_unlock(); |
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return 0; |
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} |
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if (list_empty_careful(&deve->ua_list)) { |
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rcu_read_unlock(); return 0; } rcu_read_unlock(); |
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/* * From sam4r14, section 5.14 Unit attention condition: * * a) if an INQUIRY command enters the enabled command state, the * device server shall process the INQUIRY command and shall neither * report nor clear any unit attention condition; * b) if a REPORT LUNS command enters the enabled command state, the * device server shall process the REPORT LUNS command and shall not * report any unit attention condition; * e) if a REQUEST SENSE command enters the enabled command state while * a unit attention condition exists for the SCSI initiator port * associated with the I_T nexus on which the REQUEST SENSE command * was received, then the device server shall process the command * and either: */ |
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switch (cmd->t_task_cdb[0]) { |
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case INQUIRY: case REPORT_LUNS: case REQUEST_SENSE: return 0; default: |
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return TCM_CHECK_CONDITION_UNIT_ATTENTION; |
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} |
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} int core_scsi3_ua_allocate( |
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struct se_dev_entry *deve, |
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u8 asc, u8 ascq) { |
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struct se_ua *ua, *ua_p, *ua_tmp; |
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ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC); |
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if (!ua) { pr_err("Unable to allocate struct se_ua "); |
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return -ENOMEM; |
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} |
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INIT_LIST_HEAD(&ua->ua_nacl_list); |
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ua->ua_asc = asc; ua->ua_ascq = ascq; |
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spin_lock(&deve->ua_lock); list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) { /* * Do not report the same UNIT ATTENTION twice.. */ if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) { spin_unlock(&deve->ua_lock); |
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kmem_cache_free(se_ua_cache, ua); return 0; } /* * Attach the highest priority Unit Attention to * the head of the list following sam4r14, * Section 5.14 Unit Attention Condition: * * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest * POWER ON OCCURRED or * DEVICE INTERNAL RESET * SCSI BUS RESET OCCURRED or * MICROCODE HAS BEEN CHANGED or * protocol specific * BUS DEVICE RESET FUNCTION OCCURRED * I_T NEXUS LOSS OCCURRED * COMMANDS CLEARED BY POWER LOSS NOTIFICATION * all others Lowest * * Each of the ASCQ codes listed above are defined in * the 29h ASC family, see spc4r17 Table D.1 */ if (ua_p->ua_asc == 0x29) { if ((asc == 0x29) && (ascq > ua_p->ua_ascq)) list_add(&ua->ua_nacl_list, &deve->ua_list); else list_add_tail(&ua->ua_nacl_list, &deve->ua_list); } else if (ua_p->ua_asc == 0x2a) { /* * Incoming Family 29h ASCQ codes will override * Family 2AHh ASCQ codes for Unit Attention condition. */ if ((asc == 0x29) || (ascq > ua_p->ua_asc)) list_add(&ua->ua_nacl_list, &deve->ua_list); else list_add_tail(&ua->ua_nacl_list, &deve->ua_list); } else list_add_tail(&ua->ua_nacl_list, &deve->ua_list); spin_unlock(&deve->ua_lock); |
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return 0; } list_add_tail(&ua->ua_nacl_list, &deve->ua_list); spin_unlock(&deve->ua_lock); |
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pr_debug("Allocated UNIT ATTENTION, mapped LUN: %llu, ASC:" " 0x%02x, ASCQ: 0x%02x ", deve->mapped_lun, |
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asc, ascq); |
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return 0; } |
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void target_ua_allocate_lun(struct se_node_acl *nacl, u32 unpacked_lun, u8 asc, u8 ascq) { struct se_dev_entry *deve; if (!nacl) return; rcu_read_lock(); deve = target_nacl_find_deve(nacl, unpacked_lun); if (!deve) { rcu_read_unlock(); return; } core_scsi3_ua_allocate(deve, asc, ascq); rcu_read_unlock(); } |
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void core_scsi3_ua_release_all( struct se_dev_entry *deve) { struct se_ua *ua, *ua_p; spin_lock(&deve->ua_lock); list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { list_del(&ua->ua_nacl_list); kmem_cache_free(se_ua_cache, ua); |
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} spin_unlock(&deve->ua_lock); } |
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/* * Dequeue a unit attention from the unit attention list. This function * returns true if the dequeuing succeeded and if *@key, *@asc and *@ascq have * been set. */ bool core_scsi3_ua_for_check_condition(struct se_cmd *cmd, u8 *key, u8 *asc, u8 *ascq) |
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{ |
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struct se_device *dev = cmd->se_dev; |
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struct se_dev_entry *deve; struct se_session *sess = cmd->se_sess; struct se_node_acl *nacl; struct se_ua *ua = NULL, *ua_p; int head = 1; |
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bool dev_ua_intlck_clear = (dev->dev_attrib.emulate_ua_intlck_ctrl == TARGET_UA_INTLCK_CTRL_CLEAR); |
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if (WARN_ON_ONCE(!sess)) return false; |
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nacl = sess->se_node_acl; |
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if (WARN_ON_ONCE(!nacl)) return false; |
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rcu_read_lock(); deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); if (!deve) { rcu_read_unlock(); |
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*key = ILLEGAL_REQUEST; *asc = 0x25; /* LOGICAL UNIT NOT SUPPORTED */ *ascq = 0; return true; |
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} |
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*key = UNIT_ATTENTION; |
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/* * The highest priority Unit Attentions are placed at the head of the * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION + * sense data for the received CDB. */ spin_lock(&deve->ua_lock); list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { /* * For ua_intlck_ctrl code not equal to 00b, only report the * highest priority UNIT_ATTENTION and ASC/ASCQ without * clearing it. */ |
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if (!dev_ua_intlck_clear) { |
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*asc = ua->ua_asc; *ascq = ua->ua_ascq; break; } /* * Otherwise for the default 00b, release the UNIT ATTENTION |
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* condition. Return the ASC/ASCQ of the highest priority UA |
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* (head of the list) in the outgoing CHECK_CONDITION + sense. */ if (head) { *asc = ua->ua_asc; *ascq = ua->ua_ascq; head = 0; } list_del(&ua->ua_nacl_list); kmem_cache_free(se_ua_cache, ua); |
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} spin_unlock(&deve->ua_lock); |
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rcu_read_unlock(); |
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pr_debug("[%s]: %s UNIT ATTENTION condition with" |
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" INTLCK_CTRL: %d, mapped LUN: %llu, got CDB: 0x%02x" |
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" reported ASC: 0x%02x, ASCQ: 0x%02x ", |
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nacl->se_tpg->se_tpg_tfo->fabric_name, |
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dev_ua_intlck_clear ? "Releasing" : "Reporting", dev->dev_attrib.emulate_ua_intlck_ctrl, |
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cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq); |
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return head == 0; |
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} int core_scsi3_ua_clear_for_request_sense( struct se_cmd *cmd, u8 *asc, u8 *ascq) { struct se_dev_entry *deve; struct se_session *sess = cmd->se_sess; struct se_node_acl *nacl; struct se_ua *ua = NULL, *ua_p; int head = 1; |
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if (!sess) |
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return -EINVAL; |
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nacl = sess->se_node_acl; |
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if (!nacl) |
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return -EINVAL; |
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rcu_read_lock(); deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); if (!deve) { rcu_read_unlock(); return -EINVAL; } |
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if (list_empty_careful(&deve->ua_list)) { |
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rcu_read_unlock(); |
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return -EPERM; |
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} /* * The highest priority Unit Attentions are placed at the head of the * struct se_dev_entry->ua_list. The First (and hence highest priority) * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the * matching struct se_lun. * * Once the returning ASC/ASCQ values are set, we go ahead and |
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* release all of the Unit Attention conditions for the associated |
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* struct se_lun. */ spin_lock(&deve->ua_lock); list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) { if (head) { *asc = ua->ua_asc; *ascq = ua->ua_ascq; head = 0; } list_del(&ua->ua_nacl_list); kmem_cache_free(se_ua_cache, ua); |
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} spin_unlock(&deve->ua_lock); |
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rcu_read_unlock(); |
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pr_debug("[%s]: Released UNIT ATTENTION condition, mapped" |
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" LUN: %llu, got REQUEST_SENSE reported ASC: 0x%02x," |
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" ASCQ: 0x%02x ", nacl->se_tpg->se_tpg_tfo->fabric_name, |
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cmd->orig_fe_lun, *asc, *ascq); |
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return (head) ? -EPERM : 0; |
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} |