>From 2fed7603d2b4b8f0fb7a6bd1f3087eb6cbe0d21a Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Tue, 24 Mar 2009 22:14:27 -0700
Subject: [PATCH 1/2] [Target_Core_Mod]: Add support for UNIT_ATTENTION conditions
This patch adds support for UNIT_ATTENTION and ua_intlck_ctrl emulation
following spc4r17, section 7.4.6 Control Mode Page, Table 349.
Upon reception of a REQUEST_SENSE, this patch will report and release a
UNIT_ATTENTION condition for a given I_T Nexus. It adds a se_ua_t structure
defs, and new UA related structure members to se_dev_entry_t in
se_node_acl->device_list[] coming from se_lun_acl_t mapped se_lun_t objects.
Upon release of mapped target_core_mod LUN ACL, this patch will release all
associated UNIT ATTENTION conditions.
By default, this patch uses ua_intlck_ctrl code 00b, and clears UNIT
ATTENTION conditions by sending CHECK_CONDITION with a SENSE KEY of
UNIT ATTENTION + the associated highest priority ASC+ASCQ when a UNIT
ATTENTION condition has been established. Note that this is the current
behaviour of Linux/SCSI and linux/drivers/scsi midlayer code for ua_intlck_ctrl.
This patch also supports the optional 2nd and 3rd modes of ua_intlck_ctrl
(code 10b and 11b), with the latter using:
target_core_ua.h:ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS.
Both of these modes have been tested with this code and require manual
intervention with sg_requests and REQUEST_SENSE for Linux/SCSI Initiator ports
to explictly release a target_core_mod established UNIT ATTENTION condition.
Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/lio-core/Makefile | 1 +
drivers/lio-core/target_core_base.h | 13 ++
drivers/lio-core/target_core_configfs.c | 4 +
drivers/lio-core/target_core_device.c | 27 +++-
drivers/lio-core/target_core_device.h | 1 +
drivers/lio-core/target_core_tpg.c | 10 +
drivers/lio-core/target_core_transport.c | 127 ++++++++++--
drivers/lio-core/target_core_transport.h | 2 +
drivers/lio-core/target_core_ua.c | 333 ++++++++++++++++++++++++++++++
drivers/lio-core/target_core_ua.h | 36 ++++
10 files changed, 534 insertions(+), 20 deletions(-)
create mode 100644 drivers/lio-core/target_core_ua.c
create mode 100644 drivers/lio-core/target_core_ua.h
diff --git a/drivers/lio-core/Makefile b/drivers/lio-core/Makefile
index a171db3..66eba19 100644
--- a/drivers/lio-core/Makefile
+++ b/drivers/lio-core/Makefile
@@ -40,6 +40,7 @@ target_core_mod-objs := target_core_configfs.o \
target_core_tmr.o \
target_core_tpg.o \
target_core_transport.o \
+ target_core_ua.o \
div64.o
ifeq ($(LINUX_IBLOCK), 1)
diff --git a/drivers/lio-core/target_core_base.h b/drivers/lio-core/target_core_base.h
index cab978f..cb56d6a 100644
--- a/drivers/lio-core/target_core_base.h
+++ b/drivers/lio-core/target_core_base.h
@@ -197,6 +197,7 @@
#define UNKNOWN_MODE_PAGE 0xb
#define WRITE_PROTECTED 0xc
#define CHECK_CONDITION_ABORT_CMD 0xd
+#define CHECK_CONDITION_UNIT_ATTENTION 0xe
typedef struct se_obj_s {
atomic_t obj_access_count;
@@ -539,6 +540,14 @@ typedef struct se_tmr_req_s {
struct list_head tmr_list;
} ____cacheline_aligned se_tmr_req_t;
+typedef struct se_ua_s {
+ u8 ua_asc;
+ u8 ua_ascq;
+ struct se_node_acl_s *ua_nacl;
+ struct list_head ua_dev_list;
+ struct list_head ua_nacl_list;
+} ____cacheline_aligned se_ua_t;
+
typedef struct se_node_acl_s {
char initiatorname[TRANSPORT_IQN_LEN];
int nodeacl_flags;
@@ -600,12 +609,16 @@ typedef struct se_dev_entry_s {
u64 read_bytes;
u64 write_bytes;
#endif /* SNMP_SUPPORT */
+ atomic_t ua_count;
+ spinlock_t ua_lock;
struct se_lun_s *se_lun;
+ struct list_head ua_list;
} ____cacheline_aligned se_dev_entry_t;
typedef struct se_dev_attrib_s {
int status_thread;
int status_thread_tur;
+ int emulate_ua_intlck_ctrl;
int emulate_tas;
int emulate_reservations;
int emulate_alua;
diff --git a/drivers/lio-core/target_core_configfs.c b/drivers/lio-core/target_core_configfs.c
index 5473d4c..975ecb8 100644
--- a/drivers/lio-core/target_core_configfs.c
+++ b/drivers/lio-core/target_core_configfs.c
@@ -478,6 +478,9 @@ SE_DEV_ATTR(status_thread, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(status_thread_tur);
SE_DEV_ATTR(status_thread_tur, S_IRUGO | S_IWUSR);
+DEF_DEV_ATTRIB(emulate_ua_intlck_ctrl);
+SE_DEV_ATTR(emulate_ua_intlck_ctrl, S_IRUGO | S_IWUSR);
+
DEF_DEV_ATTRIB(emulate_tas);
SE_DEV_ATTR(emulate_tas, S_IRUGO | S_IWUSR);
@@ -507,6 +510,7 @@ CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib_s, da_group);
static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
&target_core_dev_attrib_status_thread.attr,
&target_core_dev_attrib_status_thread_tur.attr,
+ &target_core_dev_attrib_emulate_ua_intlck_ctrl.attr,
&target_core_dev_attrib_emulate_tas.attr,
&target_core_dev_attrib_hw_block_size.attr,
&target_core_dev_attrib_block_size.attr,
diff --git a/drivers/lio-core/target_core_device.c b/drivers/lio-core/target_core_device.c
index a1c5c95..95ab18d 100644
--- a/drivers/lio-core/target_core_device.c
+++ b/drivers/lio-core/target_core_device.c
@@ -49,6 +49,7 @@
#include <target_core_pr.h>
#include <target_core_tpg.h>
#include <target_core_transport.h>
+#include <target_core_ua.h>
#include <target_core_fabric_ops.h>
#include <target_core_plugin.h>
#include <target_core_seobj.h>
@@ -483,12 +484,12 @@ void core_update_device_list_for_node(
deve->attach_count++;
#endif /* SNMP_SUPPORT */
spin_unlock_bh(&nacl->device_list_lock);
-
return;
}
/*
* Disable se_dev_entry_t LUN ACL mapping
*/
+ core_scsi3_ua_release_all(deve);
deve->se_lun = NULL;
deve->lun_flags = 0;
deve->creation_time = 0;
@@ -869,6 +870,7 @@ void se_dev_set_default_attribs(se_device_t *dev)
{
DEV_ATTRIB(dev)->status_thread = DA_STATUS_THREAD;
DEV_ATTRIB(dev)->status_thread_tur = DA_STATUS_THREAD_TUR;
+ DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
@@ -970,11 +972,32 @@ int se_dev_set_status_thread_tur(se_device_t *dev, int flag)
return 0;
}
+int se_dev_set_emulate_ua_intlck_ctrl(se_device_t *dev, int flag)
+{
+ if ((flag != 0) && (flag != 1) && (flag != 2)) {
+ printk(KERN_ERR "Illegal value %d\n", flag);
+ return -1;
+ }
+
+ if (DEV_OBJ_API(dev)->check_count(&dev->dev_export_obj)) {
+ printk(KERN_ERR "dev[%p]: Unable to change SE Device"
+ " UA_INTRLCK_CTRL while dev_export_obj: %d count"
+ " exists\n", dev,
+ DEV_OBJ_API(dev)->check_count(&dev->dev_export_obj));
+ return -1;
+ }
+ DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
+ printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
+ dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
+
+ return 0;
+}
+
int se_dev_set_emulate_tas(se_device_t *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
printk(KERN_ERR "Illegal value %d\n", flag);
- return 1;
+ return -1;
}
if (DEV_OBJ_API(dev)->check_count(&dev->dev_export_obj)) {
diff --git a/drivers/lio-core/target_core_device.h b/drivers/lio-core/target_core_device.h
index 3b46ef1..2877d01 100644
--- a/drivers/lio-core/target_core_device.h
+++ b/drivers/lio-core/target_core_device.h
@@ -62,6 +62,7 @@ extern void se_dev_set_default_attribs(se_device_t *);
extern int se_dev_set_task_timeout(se_device_t *, u32);
extern int se_dev_set_status_thread(se_device_t *, int);
extern int se_dev_set_status_thread_tur(se_device_t *, int);
+extern int se_dev_set_emulate_ua_intlck_ctrl(se_device_t *, int);
extern int se_dev_set_emulate_tas(se_device_t *, int);
extern int se_dev_set_queue_depth(se_device_t *, u32);
extern int se_dev_set_max_sectors(se_device_t *, u32);
diff --git a/drivers/lio-core/target_core_tpg.c b/drivers/lio-core/target_core_tpg.c
index 406cbae..e406022 100644
--- a/drivers/lio-core/target_core_tpg.c
+++ b/drivers/lio-core/target_core_tpg.c
@@ -235,6 +235,9 @@ static int core_set_queue_depth_for_node(
*/
static int core_create_device_list_for_node(se_node_acl_t *nacl)
{
+ se_dev_entry_t *deve;
+ int i;
+
nacl->device_list = kzalloc(sizeof(se_dev_entry_t) *
TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
if (!(nacl->device_list)) {
@@ -242,6 +245,13 @@ static int core_create_device_list_for_node(se_node_acl_t *nacl)
" se_node_acl_t->device_list\n");
return -1;
}
+ for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
+ deve = &nacl->device_list[i];
+
+ atomic_set(&deve->ua_count, 0);
+ spin_lock_init(&deve->ua_lock);
+ INIT_LIST_HEAD(&deve->ua_list);
+ }
return 0;
}
diff --git a/drivers/lio-core/target_core_transport.c b/drivers/lio-core/target_core_transport.c
index 6fa358d..07c49f9 100644
--- a/drivers/lio-core/target_core_transport.c
+++ b/drivers/lio-core/target_core_transport.c
@@ -53,6 +53,7 @@
#include <target_core_pr.h>
#include <target_core_alua.h>
#include <target_core_tmr.h>
+#include <target_core_ua.h>
#include <target_core_transport.h>
#include <target_core_plugin.h>
#include <target_core_seobj.h>
@@ -189,6 +190,7 @@ struct kmem_cache *se_cmd_cache;
struct kmem_cache *se_task_cache;
struct kmem_cache *se_tmr_req_cache;
struct kmem_cache *se_sess_cache;
+struct kmem_cache *se_ua_cache;
struct kmem_cache *t10_pr_reg_cache;
struct kmem_cache *t10_alua_lu_gp_cache;
struct kmem_cache *t10_alua_lu_gp_mem_cache;
@@ -288,6 +290,12 @@ int init_se_global(void)
" failed\n");
goto out;
}
+ se_ua_cache = kmem_cache_create("se_ua_cache",
+ sizeof(se_ua_t), __alignof__(se_ua_t), 0, NULL);
+ if (!(se_ua_cache)) {
+ printk(KERN_ERR "kmem_cache_create() for se_ua_t failed\n");
+ goto out;
+ }
t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
sizeof(t10_pr_registration_t),
__alignof__(t10_pr_registration_t), 0, NULL);
@@ -374,6 +382,8 @@ out:
kmem_cache_destroy(se_tmr_req_cache);
if (se_sess_cache)
kmem_cache_destroy(se_sess_cache);
+ if (se_ua_cache)
+ kmem_cache_destroy(se_ua_cache);
if (t10_pr_reg_cache)
kmem_cache_destroy(t10_pr_reg_cache);
if (t10_alua_lu_gp_cache)
@@ -402,6 +412,7 @@ void release_se_global(void)
kmem_cache_destroy(se_task_cache);
kmem_cache_destroy(se_tmr_req_cache);
kmem_cache_destroy(se_sess_cache);
+ kmem_cache_destroy(se_ua_cache);
kmem_cache_destroy(t10_pr_reg_cache);
kmem_cache_destroy(t10_alua_lu_gp_cache);
kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
@@ -2778,6 +2789,18 @@ int transport_generic_allocate_tasks(
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
+ /*
+ * For UA Interlock Code 11b, a RESERVATION CONFLICT will
+ * establish a UNIT ATTENTION with PREVIOUS RESERVATION
+ * CONFLICT STATUS.
+ *
+ * See spc4r17, section 7.4.6 Control Mode Page, Table 349
+ */
+ if (SE_SESS(cmd) &&
+ DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2)
+ core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl,
+ cmd->orig_fe_lun, 0x2C,
+ ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
return -2;
case 6:
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
@@ -2787,6 +2810,10 @@ int transport_generic_allocate_tasks(
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = ILLEGAL_REQUEST;
return -2;
+ case 8:
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = CHECK_CONDITION_UNIT_ATTENTION;
+ return -2;
default:
break;
}
@@ -4511,8 +4538,27 @@ static int transport_modesense_control(se_device_t *dev, unsigned char *p)
* status and shall not establish a unit attention condition when a com-
* mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
* status.
+ *
+ * 10b: The logical unit shall not clear any unit attention condition
+ * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+ * status and shall not establish a unit attention condition when
+ * a command is completed with BUSY, TASK SET FULL, or RESERVATION
+ * CONFLICT status.
+ *
+ * 11b a The logical unit shall not clear any unit attention condition
+ * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
+ * status and shall establish a unit attention condition for the
+ * initiator port associated with the I_T nexus on which the BUSY,
+ * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
+ * Depending on the status, the additional sense code shall be set to
+ * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
+ * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
+ * command, a unit attention condition shall be established only once
+ * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
+ * to the number of commands completed with one of those status codes.
*/
- p[4] = 0x00;
+ p[4] = (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl == 2) ? 0x30 :
+ (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
/*
* From spc4r17, section 7.4.6 Control mode Page
*
@@ -4651,29 +4697,53 @@ int transport_generic_emulate_request_sense(
unsigned char *cdb)
{
unsigned char *buf = (unsigned char *) T_TASK(cmd)->t_task_buf;
+ u8 ua_asc = 0, ua_ascq = 0;
if (cdb[1] & 0x01) {
printk(KERN_ERR "REQUEST_SENSE description emulation not"
" supported\n");
return PYX_TRANSPORT_INVALID_CDB_FIELD;
}
- /*
- * CURRENT ERROR
- */
- buf[0] = 0x70;
- buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
- /*
- * Make sure request data length is enough for additional sense data.
- */
- if (cmd->data_length <= 18) {
- buf[7] = 0x00;
- return 0;
+ if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) {
+ /*
+ * CURRENT ERROR, UNIT ATTENTION
+ */
+ buf[0] = 0x70;
+ buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+ /*
+ * Make sure request data length is enough for additional
+ * sense data.
+ */
+ if (cmd->data_length <= 18) {
+ buf[7] = 0x00;
+ return 0;
+ }
+ /*
+ * The Additional Sense Code (ASC) from the UNIT ATTENTION
+ */
+ buf[SPC_ASC_KEY_OFFSET] = ua_asc;
+ buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
+ buf[7] = 0x0A;
+ } else {
+ /*
+ * CURRENT ERROR, NO SENSE
+ */
+ buf[0] = 0x70;
+ buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
+ /*
+ * Make sure request data length is enough for additional
+ * sense data.
+ */
+ if (cmd->data_length <= 18) {
+ buf[7] = 0x00;
+ return 0;
+ }
+ /*
+ * NO ADDITIONAL SENSE INFORMATION
+ */
+ buf[SPC_ASC_KEY_OFFSET] = 0x00;
+ buf[7] = 0x0A;
}
- /*
- * NO ADDITIONAL SENSE INFORMATION
- */
- buf[SPC_ASC_KEY_OFFSET] = 0x00;
- buf[7] = 0x0A;
return 0;
}
@@ -4777,7 +4847,18 @@ static int transport_generic_cmd_sequencer(
se_subsystem_dev_t *su_dev = dev->se_sub_dev;
int ret = 0, sector_ret = 0;
u32 sectors = 0, size = 0, pr_reg_type = 0;
-
+ /*
+ * Check for an existing UNIT ATTENTION condition
+ */
+ if (core_scsi3_ua_check(cmd, cdb) < 0) {
+ cmd->transport_wait_for_tasks =
+ &transport_nop_wait_for_tasks;
+ transport_get_maps(cmd);
+ return 8; /* UNIT ATTENTION */
+ }
+ /*
+ * Check status for SPC-3 Persistent Reservations
+ */
if (T10_RES(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) {
if (T10_RES(su_dev)->t10_seq_non_holder(
cmd, cdb, pr_reg_type) != 0) {
@@ -7104,6 +7185,7 @@ int transport_send_check_condition_and_sense(
unsigned char *buffer = cmd->sense_buffer;
unsigned long flags;
int offset;
+ u8 asc = 0, ascq = 0;
spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
@@ -7222,6 +7304,15 @@ int transport_send_check_condition_and_sense(
/* WRITE PROTECTED */
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
break;
+ case CHECK_CONDITION_UNIT_ATTENTION:
+ /* CURRENT ERROR */
+ buffer[offset] = 0x70;
+ /* UNIT ATTENTION */
+ buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
+ core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
+ buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
+ buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
+ break;
case LOGICAL_UNIT_COMMUNICATION_FAILURE:
default:
/* CURRENT ERROR */
diff --git a/drivers/lio-core/target_core_transport.h b/drivers/lio-core/target_core_transport.h
index f3637ec..d207462 100644
--- a/drivers/lio-core/target_core_transport.h
+++ b/drivers/lio-core/target_core_transport.h
@@ -102,6 +102,8 @@
#define DA_STATUS_THREAD 0
/* Disabled by default */
#define DA_STATUS_THREAD_TUR 0
+/* Emulation for UNIT ATTENTION Interlock Control */
+#define DA_EMULATE_UA_INTLLCK_CTRL 0
/* Emulation for TASK_ABORTED status (TAS) by default */
#define DA_EMULATE_TAS 1
/* No Emulation for PSCSI by default */
diff --git a/drivers/lio-core/target_core_ua.c b/drivers/lio-core/target_core_ua.c
new file mode 100644
index 0000000..2e88b07
--- /dev/null
+++ b/drivers/lio-core/target_core_ua.c
@@ -0,0 +1,333 @@
+/*******************************************************************************
+ * Filename: target_core_ua.c
+ *
+ * This file contains logic for SPC-3 Unit Attention emulation
+ *
+ * Copyright (c) 2009 Rising Tide, Inc.
+ * Copyright (c) 2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@xxxxxxxxxx>
+ *
+ * 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.
+ *
+ ******************************************************************************/
+
+#define TARGET_CORE_UA_C
+
+#include <linux/version.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target_core_base.h>
+#include <target_core_device.h>
+#include <target_core_hba.h>
+#include <target_core_transport.h>
+#include <target_core_alua.h>
+#include <target_core_pr.h>
+#include <target_core_ua.h>
+#include <target_core_transport_plugin.h>
+#include <target_core_fabric_ops.h>
+#include <target_core_configfs.h>
+
+#undef TARGET_CORE_UA_C
+
+int core_scsi3_ua_check(
+ se_cmd_t *cmd,
+ unsigned char *cdb)
+{
+ se_dev_entry_t *deve;
+ se_session_t *sess = cmd->se_sess;
+ se_node_acl_t *nacl;
+
+ if (!(sess))
+ return 0;
+
+ nacl = sess->se_node_acl;
+ if (!(nacl))
+ return 0;
+
+ deve = &nacl->device_list[cmd->orig_fe_lun];
+ if (!(atomic_read(&deve->ua_count)))
+ return 0;
+ /*
+ * 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 (cdb[0]) {
+ case INQUIRY:
+ case REPORT_LUNS:
+ case REQUEST_SENSE:
+ return 0;
+ default:
+ return -1;
+ }
+
+ return -1;
+}
+
+int core_scsi3_ua_allocate(
+ se_node_acl_t *nacl,
+ u32 unpacked_lun,
+ u8 asc,
+ u8 ascq)
+{
+ se_dev_entry_t *deve;
+ se_ua_t *ua, *ua_p, *ua_tmp;
+ /*
+ * PASSTHROUGH OPS
+ */
+ if (!(nacl))
+ return -1;
+
+ ua = kmem_cache_zalloc(se_ua_cache, GFP_KERNEL);
+ if (!(ua)) {
+ printk(KERN_ERR "Unable to allocate se_ua_t\n");
+ return -1;
+ }
+ INIT_LIST_HEAD(&ua->ua_dev_list);
+ INIT_LIST_HEAD(&ua->ua_nacl_list);
+
+ ua->ua_nacl = nacl;
+ ua->ua_asc = asc;
+ ua->ua_ascq = ascq;
+
+ spin_lock(&nacl->device_list_lock);
+ deve = &nacl->device_list[unpacked_lun];
+
+ 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);
+
+ atomic_inc(&deve->ua_count);
+ smp_mb__after_atomic_inc();
+ return 0;
+ }
+ list_add_tail(&ua->ua_nacl_list, &deve->ua_list);
+ spin_unlock(&deve->ua_lock);
+ spin_unlock(&nacl->device_list_lock);
+
+ printk(KERN_INFO "[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:"
+ " 0x%02x, ASCQ: 0x%02x\n",
+ TPG_TFO(nacl->se_tpg)->get_fabric_name(), unpacked_lun,
+ asc, ascq);
+
+ atomic_inc(&deve->ua_count);
+ smp_mb__after_atomic_inc();
+ return 0;
+}
+
+void core_scsi3_ua_release_all(
+ se_dev_entry_t *deve)
+{
+ se_ua_t *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);
+
+ atomic_dec(&deve->ua_count);
+ smp_mb__after_atomic_dec();
+ }
+ spin_unlock(&deve->ua_lock);
+}
+
+void core_scsi3_ua_for_check_condition(
+ se_cmd_t *cmd,
+ u8 *asc,
+ u8 *ascq)
+{
+ se_device_t *dev = SE_DEV(cmd);
+ se_dev_entry_t *deve;
+ se_session_t *sess = cmd->se_sess;
+ se_node_acl_t *nacl;
+ se_ua_t *ua = NULL, *ua_p;
+ int head = 1;
+
+ if (!(sess))
+ return;
+
+ nacl = sess->se_node_acl;
+ if (!(nacl))
+ return;
+
+ spin_lock(&nacl->device_list_lock);
+ deve = &nacl->device_list[cmd->orig_fe_lun];
+ if (!(atomic_read(&deve->ua_count))) {
+ spin_unlock(&nacl->device_list_lock);
+ return;
+ }
+ /*
+ * The highest priority Unit Attentions are placed at the head of the
+ * se_dev_entry_t->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_ATTRIB(dev)->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 higest 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);
+
+ atomic_dec(&deve->ua_count);
+ smp_mb__after_atomic_dec();
+ }
+ spin_unlock(&deve->ua_lock);
+ spin_unlock(&nacl->device_list_lock);
+
+ printk(KERN_INFO "[%s]: %s UNIT ATTENTION condition with"
+ " INTLCK_CTRL: %d, mapped LUN: %u, reported ASC: 0x%02x, ASCQ:"
+ " 0x%02x\n", TPG_TFO(nacl->se_tpg)->get_fabric_name(),
+ (DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl != 0) ? "Reporting" :
+ "Releasing", DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl,
+ cmd->orig_fe_lun, *asc, *ascq);
+}
+
+int core_scsi3_ua_clear_for_request_sense(
+ se_cmd_t *cmd,
+ u8 *asc,
+ u8 *ascq)
+{
+ se_dev_entry_t *deve;
+ se_session_t *sess = cmd->se_sess;
+ se_node_acl_t *nacl;
+ se_ua_t *ua = NULL, *ua_p;
+ int head = 1;
+
+ if (!(sess))
+ return -1;
+
+ nacl = sess->se_node_acl;
+ if (!(nacl))
+ return -1;
+
+ spin_lock(&nacl->device_list_lock);
+ deve = &nacl->device_list[cmd->orig_fe_lun];
+ if (!(atomic_read(&deve->ua_count))) {
+ spin_unlock(&nacl->device_list_lock);
+ return -1;
+ }
+ /*
+ * The highest priority Unit Attentions are placed at the head of the
+ * se_dev_entry_t->ua_list. The First (and hence highest priority)
+ * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the
+ * matching se_lun_t.
+ *
+ * Once the returning ASC/ASCQ values are set, we go ahead and
+ * release all of the Unit Attention conditions for the assoicated
+ * se_lun_t.
+ */
+ 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);
+
+ atomic_dec(&deve->ua_count);
+ smp_mb__after_atomic_dec();
+ }
+ spin_unlock(&deve->ua_lock);
+ spin_unlock(&nacl->device_list_lock);
+
+ printk(KERN_INFO "[%s]: Released UNIT ATTENTION condition, mapped"
+ " LUN: %u, reported ASC: 0x%02x, ASCQ: 0x%02x\n",
+ TPG_TFO(nacl->se_tpg)->get_fabric_name(), cmd->orig_fe_lun,
+ *asc, *ascq);
+
+ return (head) ? -1 : 0;
+}
diff --git a/drivers/lio-core/target_core_ua.h b/drivers/lio-core/target_core_ua.h
new file mode 100644
index 0000000..9e600d0
--- /dev/null
+++ b/drivers/lio-core/target_core_ua.h
@@ -0,0 +1,36 @@
+#ifndef TARGET_CORE_UA_H
+
+/*
+ * From spc4r17, Table D.1: ASC and ASCQ Assignement
+ */
+#define ASCQ_29H_POWER_ON_RESET_OR_BUS_DEVICE_RESET_OCCURED 0x00
+#define ASCQ_29H_POWER_ON_OCCURRED 0x01
+#define ASCQ_29H_SCSI_BUS_RESET_OCCURED 0x02
+#define ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED 0x03
+#define ASCQ_29H_DEVICE_INTERNAL_RESET 0x04
+#define ASCQ_29H_TRANSCEIVER_MODE_CHANGED_TO_SINGLE_ENDED 0x05
+#define ASCQ_29H_TRANSCEIVER_MODE_CHANGED_TO_LVD 0x06
+#define ASCQ_29H_NEXUS_LOSS_OCCURRED 0x07
+
+#define ASCQ_2AH_PARAMETERS_CHANGED 0x00
+#define ASCQ_2AH_MODE_PARAMETERS_CHANGED 0x01
+#define ASCQ_2AH_LOG_PARAMETERS_CHANGED 0x02
+#define ASCQ_2AH_RESERVATIONS_PREEMPTED 0x03
+#define ASCQ_2AH_RESERVATIONS_RELEASED 0x04
+#define ASCQ_2AH_REGISTRATIONS_PREEMPTED 0x05
+#define ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED 0x06
+#define ASCQ_2AH_IMPLICT_ASYMMETRIC_ACCESS_STATE_TRANSITION_FAILED 0x07
+#define ASCQ_2AH_PRIORITY_CHANGED 0x08
+
+#define ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS 0x09
+
+extern struct kmem_cache *se_ua_cache;
+
+extern int core_scsi3_ua_check(struct se_cmd_s *, unsigned char *);
+extern int core_scsi3_ua_allocate(struct se_node_acl_s *, u32, u8, u8);
+extern void core_scsi3_ua_release_all(struct se_dev_entry_s *);
+extern void core_scsi3_ua_for_check_condition(struct se_cmd_s *, u8 *, u8 *);
+extern int core_scsi3_ua_clear_for_request_sense(struct se_cmd_s *,
+ u8 *, u8 *);
+
+#endif /* TARGET_CORE_UA_H */
--
1.5.4.1
--
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