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