322 lines
8.2 KiB
C
322 lines
8.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
/*******************************************************************************
|
||
|
* Filename: target_core_ua.c
|
||
|
*
|
||
|
* This file contains logic for SPC-3 Unit Attention emulation
|
||
|
*
|
||
|
* (c) Copyright 2009-2013 Datera, Inc.
|
||
|
*
|
||
|
* Nicholas A. Bellinger <nab@kernel.org>
|
||
|
*
|
||
|
******************************************************************************/
|
||
|
|
||
|
#include <linux/slab.h>
|
||
|
#include <linux/spinlock.h>
|
||
|
#include <scsi/scsi_proto.h>
|
||
|
|
||
|
#include <target/target_core_base.h>
|
||
|
#include <target/target_core_fabric.h>
|
||
|
|
||
|
#include "target_core_internal.h"
|
||
|
#include "target_core_alua.h"
|
||
|
#include "target_core_pr.h"
|
||
|
#include "target_core_ua.h"
|
||
|
|
||
|
sense_reason_t
|
||
|
target_scsi3_ua_check(struct se_cmd *cmd)
|
||
|
{
|
||
|
struct se_dev_entry *deve;
|
||
|
struct se_session *sess = cmd->se_sess;
|
||
|
struct se_node_acl *nacl;
|
||
|
|
||
|
if (!sess)
|
||
|
return 0;
|
||
|
|
||
|
nacl = sess->se_node_acl;
|
||
|
if (!nacl)
|
||
|
return 0;
|
||
|
|
||
|
rcu_read_lock();
|
||
|
deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
|
||
|
if (!deve) {
|
||
|
rcu_read_unlock();
|
||
|
return 0;
|
||
|
}
|
||
|
if (list_empty_careful(&deve->ua_list)) {
|
||
|
rcu_read_unlock();
|
||
|
return 0;
|
||
|
}
|
||
|
rcu_read_unlock();
|
||
|
/*
|
||
|
* 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:
|
||
|
*/
|
||
|
switch (cmd->t_task_cdb[0]) {
|
||
|
case INQUIRY:
|
||
|
case REPORT_LUNS:
|
||
|
case REQUEST_SENSE:
|
||
|
return 0;
|
||
|
default:
|
||
|
return TCM_CHECK_CONDITION_UNIT_ATTENTION;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
int core_scsi3_ua_allocate(
|
||
|
struct se_dev_entry *deve,
|
||
|
u8 asc,
|
||
|
u8 ascq)
|
||
|
{
|
||
|
struct se_ua *ua, *ua_p, *ua_tmp;
|
||
|
|
||
|
ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC);
|
||
|
if (!ua) {
|
||
|
pr_err("Unable to allocate struct se_ua\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
INIT_LIST_HEAD(&ua->ua_nacl_list);
|
||
|
|
||
|
ua->ua_asc = asc;
|
||
|
ua->ua_ascq = ascq;
|
||
|
|
||
|
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);
|
||
|
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);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
list_add_tail(&ua->ua_nacl_list, &deve->ua_list);
|
||
|
spin_unlock(&deve->ua_lock);
|
||
|
|
||
|
pr_debug("Allocated UNIT ATTENTION, mapped LUN: %llu, ASC:"
|
||
|
" 0x%02x, ASCQ: 0x%02x\n", deve->mapped_lun,
|
||
|
asc, ascq);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
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();
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
}
|
||
|
spin_unlock(&deve->ua_lock);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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)
|
||
|
{
|
||
|
struct se_device *dev = cmd->se_dev;
|
||
|
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;
|
||
|
|
||
|
if (WARN_ON_ONCE(!sess))
|
||
|
return false;
|
||
|
|
||
|
nacl = sess->se_node_acl;
|
||
|
if (WARN_ON_ONCE(!nacl))
|
||
|
return false;
|
||
|
|
||
|
rcu_read_lock();
|
||
|
deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
|
||
|
if (!deve) {
|
||
|
rcu_read_unlock();
|
||
|
*key = ILLEGAL_REQUEST;
|
||
|
*asc = 0x25; /* LOGICAL UNIT NOT SUPPORTED */
|
||
|
*ascq = 0;
|
||
|
return true;
|
||
|
}
|
||
|
*key = UNIT_ATTENTION;
|
||
|
/*
|
||
|
* 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.
|
||
|
*/
|
||
|
if (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) {
|
||
|
*asc = ua->ua_asc;
|
||
|
*ascq = ua->ua_ascq;
|
||
|
break;
|
||
|
}
|
||
|
/*
|
||
|
* Otherwise for the default 00b, release the UNIT ATTENTION
|
||
|
* condition. Return the ASC/ASCQ of the highest priority UA
|
||
|
* (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);
|
||
|
}
|
||
|
spin_unlock(&deve->ua_lock);
|
||
|
rcu_read_unlock();
|
||
|
|
||
|
pr_debug("[%s]: %s UNIT ATTENTION condition with"
|
||
|
" INTLCK_CTRL: %d, mapped LUN: %llu, got CDB: 0x%02x"
|
||
|
" reported ASC: 0x%02x, ASCQ: 0x%02x\n",
|
||
|
nacl->se_tpg->se_tpg_tfo->fabric_name,
|
||
|
(dev->dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" :
|
||
|
"Releasing", dev->dev_attrib.emulate_ua_intlck_ctrl,
|
||
|
cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq);
|
||
|
|
||
|
return head == 0;
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
if (!sess)
|
||
|
return -EINVAL;
|
||
|
|
||
|
nacl = sess->se_node_acl;
|
||
|
if (!nacl)
|
||
|
return -EINVAL;
|
||
|
|
||
|
rcu_read_lock();
|
||
|
deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
|
||
|
if (!deve) {
|
||
|
rcu_read_unlock();
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
if (list_empty_careful(&deve->ua_list)) {
|
||
|
rcu_read_unlock();
|
||
|
return -EPERM;
|
||
|
}
|
||
|
/*
|
||
|
* 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
|
||
|
* release all of the Unit Attention conditions for the associated
|
||
|
* 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);
|
||
|
}
|
||
|
spin_unlock(&deve->ua_lock);
|
||
|
rcu_read_unlock();
|
||
|
|
||
|
pr_debug("[%s]: Released UNIT ATTENTION condition, mapped"
|
||
|
" LUN: %llu, got REQUEST_SENSE reported ASC: 0x%02x,"
|
||
|
" ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->fabric_name,
|
||
|
cmd->orig_fe_lun, *asc, *ascq);
|
||
|
|
||
|
return (head) ? -EPERM : 0;
|
||
|
}
|