Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic SCSI-3 ALUA SCSI Device Handler |
| 3 | * |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 4 | * Copyright (C) 2007-2010 Hannes Reinecke, SUSE Linux Products GmbH. |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 5 | * All rights reserved. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 20 | * |
| 21 | */ |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 23 | #include <linux/delay.h> |
Paul Gortmaker | acf3368f | 2011-05-27 09:47:43 -0400 | [diff] [blame] | 24 | #include <linux/module.h> |
Hannes Reinecke | a708977 | 2015-12-01 10:16:52 +0100 | [diff] [blame] | 25 | #include <asm/unaligned.h> |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 26 | #include <scsi/scsi.h> |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 27 | #include <scsi/scsi_proto.h> |
Hannes Reinecke | 80bd68d | 2015-12-01 10:16:47 +0100 | [diff] [blame] | 28 | #include <scsi/scsi_dbg.h> |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 29 | #include <scsi/scsi_eh.h> |
| 30 | #include <scsi/scsi_dh.h> |
| 31 | |
| 32 | #define ALUA_DH_NAME "alua" |
Hannes Reinecke | e79c82c | 2016-02-19 09:17:20 +0100 | [diff] [blame] | 33 | #define ALUA_DH_VER "2.0" |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 34 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 35 | #define TPGS_SUPPORT_NONE 0x00 |
| 36 | #define TPGS_SUPPORT_OPTIMIZED 0x01 |
| 37 | #define TPGS_SUPPORT_NONOPTIMIZED 0x02 |
| 38 | #define TPGS_SUPPORT_STANDBY 0x04 |
| 39 | #define TPGS_SUPPORT_UNAVAILABLE 0x08 |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 40 | #define TPGS_SUPPORT_LBA_DEPENDENT 0x10 |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 41 | #define TPGS_SUPPORT_OFFLINE 0x40 |
| 42 | #define TPGS_SUPPORT_TRANSITION 0x80 |
| 43 | |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 44 | #define RTPG_FMT_MASK 0x70 |
| 45 | #define RTPG_FMT_EXT_HDR 0x10 |
| 46 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 47 | #define TPGS_MODE_UNINITIALIZED -1 |
| 48 | #define TPGS_MODE_NONE 0x0 |
| 49 | #define TPGS_MODE_IMPLICIT 0x1 |
| 50 | #define TPGS_MODE_EXPLICIT 0x2 |
| 51 | |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 52 | #define ALUA_RTPG_SIZE 128 |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 53 | #define ALUA_FAILOVER_TIMEOUT 60 |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 54 | #define ALUA_FAILOVER_RETRIES 5 |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 55 | #define ALUA_RTPG_DELAY_MSECS 5 |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 56 | |
Hannes Reinecke | 6c4fc04 | 2015-12-01 10:16:51 +0100 | [diff] [blame] | 57 | /* device handler flags */ |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 58 | #define ALUA_OPTIMIZE_STPG 0x01 |
| 59 | #define ALUA_RTPG_EXT_HDR_UNSUPP 0x02 |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 60 | #define ALUA_SYNC_STPG 0x04 |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 61 | /* State machine flags */ |
| 62 | #define ALUA_PG_RUN_RTPG 0x10 |
| 63 | #define ALUA_PG_RUN_STPG 0x20 |
| 64 | #define ALUA_PG_RUNNING 0x40 |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 65 | |
Hannes Reinecke | aa90f49 | 2016-02-19 09:17:08 +0100 | [diff] [blame] | 66 | static uint optimize_stpg; |
| 67 | module_param(optimize_stpg, uint, S_IRUGO|S_IWUSR); |
| 68 | MODULE_PARM_DESC(optimize_stpg, "Allow use of a non-optimized path, rather than sending a STPG, when implicit TPGS is supported (0=No,1=Yes). Default is 0."); |
| 69 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 70 | static LIST_HEAD(port_group_list); |
| 71 | static DEFINE_SPINLOCK(port_group_lock); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 72 | static struct workqueue_struct *kaluad_wq; |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 73 | static struct workqueue_struct *kaluad_sync_wq; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 74 | |
| 75 | struct alua_port_group { |
| 76 | struct kref kref; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 77 | struct rcu_head rcu; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 78 | struct list_head node; |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 79 | struct list_head dh_list; |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 80 | unsigned char device_id_str[256]; |
| 81 | int device_id_len; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 82 | int group_id; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 83 | int tpgs; |
| 84 | int state; |
Moger, Babu | dcd3a75 | 2012-03-27 20:56:08 +0000 | [diff] [blame] | 85 | int pref; |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 86 | unsigned flags; /* used for optimizing STPG */ |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 87 | unsigned char transition_tmo; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 88 | unsigned long expiry; |
| 89 | unsigned long interval; |
| 90 | struct delayed_work rtpg_work; |
| 91 | spinlock_t lock; |
| 92 | struct list_head rtpg_list; |
| 93 | struct scsi_device *rtpg_sdev; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | struct alua_dh_data { |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 97 | struct list_head node; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 98 | struct alua_port_group *pg; |
| 99 | int group_id; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 100 | spinlock_t pg_lock; |
Chandra Seetharaman | 96e6586 | 2009-10-21 09:23:04 -0700 | [diff] [blame] | 101 | struct scsi_device *sdev; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 102 | int init_error; |
| 103 | struct mutex init_mutex; |
| 104 | }; |
| 105 | |
| 106 | struct alua_queue_data { |
| 107 | struct list_head entry; |
Chandra Seetharaman | 96e6586 | 2009-10-21 09:23:04 -0700 | [diff] [blame] | 108 | activate_complete callback_fn; |
| 109 | void *callback_data; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 110 | }; |
| 111 | |
| 112 | #define ALUA_POLICY_SWITCH_CURRENT 0 |
| 113 | #define ALUA_POLICY_SWITCH_ALL 1 |
| 114 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 115 | static void alua_rtpg_work(struct work_struct *work); |
| 116 | static void alua_rtpg_queue(struct alua_port_group *pg, |
| 117 | struct scsi_device *sdev, |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 118 | struct alua_queue_data *qdata, bool force); |
| 119 | static void alua_check(struct scsi_device *sdev, bool force); |
Chandra Seetharaman | 96e6586 | 2009-10-21 09:23:04 -0700 | [diff] [blame] | 120 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 121 | static void release_port_group(struct kref *kref) |
| 122 | { |
| 123 | struct alua_port_group *pg; |
| 124 | |
| 125 | pg = container_of(kref, struct alua_port_group, kref); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 126 | if (pg->rtpg_sdev) |
| 127 | flush_delayed_work(&pg->rtpg_work); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 128 | spin_lock(&port_group_lock); |
| 129 | list_del(&pg->node); |
| 130 | spin_unlock(&port_group_lock); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 131 | kfree_rcu(pg, rcu); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 132 | } |
| 133 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 134 | /* |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 135 | * submit_rtpg - Issue a REPORT TARGET GROUP STATES command |
| 136 | * @sdev: sdev the command should be sent to |
| 137 | */ |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 138 | static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff, |
| 139 | int bufflen, struct scsi_sense_hdr *sshdr, int flags) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 140 | { |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 141 | u8 cdb[COMMAND_SIZE(MAINTENANCE_IN)]; |
| 142 | int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
| 143 | REQ_FAILFAST_DRIVER; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 144 | |
| 145 | /* Prepare the command. */ |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 146 | memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_IN)); |
| 147 | cdb[0] = MAINTENANCE_IN; |
Hannes Reinecke | d42ae5f | 2016-02-19 09:16:58 +0100 | [diff] [blame] | 148 | if (!(flags & ALUA_RTPG_EXT_HDR_UNSUPP)) |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 149 | cdb[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT; |
Rob Evers | 8e67ce6 | 2012-05-18 14:08:55 -0400 | [diff] [blame] | 150 | else |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 151 | cdb[1] = MI_REPORT_TARGET_PGS; |
| 152 | put_unaligned_be32(bufflen, &cdb[6]); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 153 | |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 154 | return scsi_execute_req_flags(sdev, cdb, DMA_FROM_DEVICE, |
| 155 | buff, bufflen, sshdr, |
| 156 | ALUA_FAILOVER_TIMEOUT * HZ, |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame^] | 157 | ALUA_FAILOVER_RETRIES, NULL, |
| 158 | req_flags, 0); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | /* |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 162 | * submit_stpg - Issue a SET TARGET PORT GROUP command |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 163 | * |
| 164 | * Currently we're only setting the current target port group state |
| 165 | * to 'active/optimized' and let the array firmware figure out |
| 166 | * the states of the remaining groups. |
| 167 | */ |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 168 | static int submit_stpg(struct scsi_device *sdev, int group_id, |
| 169 | struct scsi_sense_hdr *sshdr) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 170 | { |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 171 | u8 cdb[COMMAND_SIZE(MAINTENANCE_OUT)]; |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 172 | unsigned char stpg_data[8]; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 173 | int stpg_len = 8; |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 174 | int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
| 175 | REQ_FAILFAST_DRIVER; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 176 | |
| 177 | /* Prepare the data buffer */ |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 178 | memset(stpg_data, 0, stpg_len); |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 179 | stpg_data[4] = SCSI_ACCESS_STATE_OPTIMAL; |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 180 | put_unaligned_be16(group_id, &stpg_data[6]); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 181 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 182 | /* Prepare the command. */ |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 183 | memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_OUT)); |
| 184 | cdb[0] = MAINTENANCE_OUT; |
| 185 | cdb[1] = MO_SET_TARGET_PGS; |
| 186 | put_unaligned_be32(stpg_len, &cdb[6]); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 187 | |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 188 | return scsi_execute_req_flags(sdev, cdb, DMA_TO_DEVICE, |
| 189 | stpg_data, stpg_len, |
| 190 | sshdr, ALUA_FAILOVER_TIMEOUT * HZ, |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame^] | 191 | ALUA_FAILOVER_RETRIES, NULL, |
| 192 | req_flags, 0); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Bart Van Assche | 1f275f9 | 2016-04-14 10:27:14 -0700 | [diff] [blame] | 195 | static struct alua_port_group *alua_find_get_pg(char *id_str, size_t id_size, |
| 196 | int group_id) |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 197 | { |
| 198 | struct alua_port_group *pg; |
| 199 | |
Hannes Reinecke | fe8b953 | 2016-05-06 10:34:35 +0200 | [diff] [blame] | 200 | if (!id_str || !id_size || !strlen(id_str)) |
| 201 | return NULL; |
| 202 | |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 203 | list_for_each_entry(pg, &port_group_list, node) { |
| 204 | if (pg->group_id != group_id) |
| 205 | continue; |
Hannes Reinecke | fe8b953 | 2016-05-06 10:34:35 +0200 | [diff] [blame] | 206 | if (!pg->device_id_len || pg->device_id_len != id_size) |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 207 | continue; |
| 208 | if (strncmp(pg->device_id_str, id_str, id_size)) |
| 209 | continue; |
| 210 | if (!kref_get_unless_zero(&pg->kref)) |
| 211 | continue; |
| 212 | return pg; |
| 213 | } |
| 214 | |
| 215 | return NULL; |
| 216 | } |
| 217 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 218 | /* |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 219 | * alua_alloc_pg - Allocate a new port_group structure |
| 220 | * @sdev: scsi device |
| 221 | * @h: alua device_handler data |
| 222 | * @group_id: port group id |
| 223 | * |
| 224 | * Allocate a new port_group structure for a given |
| 225 | * device. |
| 226 | */ |
Bart Van Assche | 1f275f9 | 2016-04-14 10:27:14 -0700 | [diff] [blame] | 227 | static struct alua_port_group *alua_alloc_pg(struct scsi_device *sdev, |
| 228 | int group_id, int tpgs) |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 229 | { |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 230 | struct alua_port_group *pg, *tmp_pg; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 231 | |
| 232 | pg = kzalloc(sizeof(struct alua_port_group), GFP_KERNEL); |
| 233 | if (!pg) |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 234 | return ERR_PTR(-ENOMEM); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 235 | |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 236 | pg->device_id_len = scsi_vpd_lun_id(sdev, pg->device_id_str, |
| 237 | sizeof(pg->device_id_str)); |
| 238 | if (pg->device_id_len <= 0) { |
| 239 | /* |
Hannes Reinecke | fe8b953 | 2016-05-06 10:34:35 +0200 | [diff] [blame] | 240 | * TPGS supported but no device identification found. |
| 241 | * Generate private device identification. |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 242 | */ |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 243 | sdev_printk(KERN_INFO, sdev, |
| 244 | "%s: No device descriptors found\n", |
| 245 | ALUA_DH_NAME); |
Hannes Reinecke | fe8b953 | 2016-05-06 10:34:35 +0200 | [diff] [blame] | 246 | pg->device_id_str[0] = '\0'; |
| 247 | pg->device_id_len = 0; |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 248 | } |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 249 | pg->group_id = group_id; |
| 250 | pg->tpgs = tpgs; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 251 | pg->state = SCSI_ACCESS_STATE_OPTIMAL; |
Hannes Reinecke | aa90f49 | 2016-02-19 09:17:08 +0100 | [diff] [blame] | 252 | if (optimize_stpg) |
| 253 | pg->flags |= ALUA_OPTIMIZE_STPG; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 254 | kref_init(&pg->kref); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 255 | INIT_DELAYED_WORK(&pg->rtpg_work, alua_rtpg_work); |
| 256 | INIT_LIST_HEAD(&pg->rtpg_list); |
| 257 | INIT_LIST_HEAD(&pg->node); |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 258 | INIT_LIST_HEAD(&pg->dh_list); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 259 | spin_lock_init(&pg->lock); |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 260 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 261 | spin_lock(&port_group_lock); |
Hannes Reinecke | 0047220 | 2016-02-19 09:17:05 +0100 | [diff] [blame] | 262 | tmp_pg = alua_find_get_pg(pg->device_id_str, pg->device_id_len, |
| 263 | group_id); |
| 264 | if (tmp_pg) { |
| 265 | spin_unlock(&port_group_lock); |
| 266 | kfree(pg); |
| 267 | return tmp_pg; |
| 268 | } |
| 269 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 270 | list_add(&pg->node, &port_group_list); |
| 271 | spin_unlock(&port_group_lock); |
| 272 | |
| 273 | return pg; |
| 274 | } |
| 275 | |
| 276 | /* |
Hannes Reinecke | d7c48fe | 2011-08-24 10:51:13 +0200 | [diff] [blame] | 277 | * alua_check_tpgs - Evaluate TPGS setting |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 278 | * @sdev: device to be checked |
| 279 | * |
Hannes Reinecke | d7c48fe | 2011-08-24 10:51:13 +0200 | [diff] [blame] | 280 | * Examine the TPGS setting of the sdev to find out if ALUA |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 281 | * is supported. |
| 282 | */ |
Hannes Reinecke | ad0ea64 | 2015-12-01 10:16:53 +0100 | [diff] [blame] | 283 | static int alua_check_tpgs(struct scsi_device *sdev) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 284 | { |
Hannes Reinecke | ad0ea64 | 2015-12-01 10:16:53 +0100 | [diff] [blame] | 285 | int tpgs = TPGS_MODE_NONE; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 286 | |
Hannes Reinecke | db5a6a6 | 2015-12-01 10:16:43 +0100 | [diff] [blame] | 287 | /* |
| 288 | * ALUA support for non-disk devices is fraught with |
| 289 | * difficulties, so disable it for now. |
| 290 | */ |
| 291 | if (sdev->type != TYPE_DISK) { |
Hannes Reinecke | db5a6a6 | 2015-12-01 10:16:43 +0100 | [diff] [blame] | 292 | sdev_printk(KERN_INFO, sdev, |
| 293 | "%s: disable for non-disk devices\n", |
| 294 | ALUA_DH_NAME); |
Hannes Reinecke | ad0ea64 | 2015-12-01 10:16:53 +0100 | [diff] [blame] | 295 | return tpgs; |
Hannes Reinecke | db5a6a6 | 2015-12-01 10:16:43 +0100 | [diff] [blame] | 296 | } |
| 297 | |
Hannes Reinecke | ad0ea64 | 2015-12-01 10:16:53 +0100 | [diff] [blame] | 298 | tpgs = scsi_device_tpgs(sdev); |
| 299 | switch (tpgs) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 300 | case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT: |
| 301 | sdev_printk(KERN_INFO, sdev, |
| 302 | "%s: supports implicit and explicit TPGS\n", |
| 303 | ALUA_DH_NAME); |
| 304 | break; |
| 305 | case TPGS_MODE_EXPLICIT: |
| 306 | sdev_printk(KERN_INFO, sdev, "%s: supports explicit TPGS\n", |
| 307 | ALUA_DH_NAME); |
| 308 | break; |
| 309 | case TPGS_MODE_IMPLICIT: |
| 310 | sdev_printk(KERN_INFO, sdev, "%s: supports implicit TPGS\n", |
| 311 | ALUA_DH_NAME); |
| 312 | break; |
Hannes Reinecke | 6cc05d4 | 2015-12-01 10:16:45 +0100 | [diff] [blame] | 313 | case TPGS_MODE_NONE: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 314 | sdev_printk(KERN_INFO, sdev, "%s: not supported\n", |
| 315 | ALUA_DH_NAME); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 316 | break; |
Hannes Reinecke | 6cc05d4 | 2015-12-01 10:16:45 +0100 | [diff] [blame] | 317 | default: |
| 318 | sdev_printk(KERN_INFO, sdev, |
| 319 | "%s: unsupported TPGS setting %d\n", |
Hannes Reinecke | ad0ea64 | 2015-12-01 10:16:53 +0100 | [diff] [blame] | 320 | ALUA_DH_NAME, tpgs); |
| 321 | tpgs = TPGS_MODE_NONE; |
Hannes Reinecke | 6cc05d4 | 2015-12-01 10:16:45 +0100 | [diff] [blame] | 322 | break; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 323 | } |
| 324 | |
Hannes Reinecke | ad0ea64 | 2015-12-01 10:16:53 +0100 | [diff] [blame] | 325 | return tpgs; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | /* |
Hannes Reinecke | 9b80dce | 2015-12-01 10:16:44 +0100 | [diff] [blame] | 329 | * alua_check_vpd - Evaluate INQUIRY vpd page 0x83 |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 330 | * @sdev: device to be checked |
| 331 | * |
| 332 | * Extract the relative target port and the target port group |
| 333 | * descriptor from the list of identificators. |
| 334 | */ |
Hannes Reinecke | a4253fd | 2016-02-19 09:17:06 +0100 | [diff] [blame] | 335 | static int alua_check_vpd(struct scsi_device *sdev, struct alua_dh_data *h, |
| 336 | int tpgs) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 337 | { |
Hannes Reinecke | 83ea0e5 | 2015-12-01 10:16:58 +0100 | [diff] [blame] | 338 | int rel_port = -1, group_id; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 339 | struct alua_port_group *pg, *old_pg = NULL; |
Dan Carpenter | 100bcb8 | 2016-03-11 14:19:03 +0300 | [diff] [blame] | 340 | bool pg_updated = false; |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 341 | unsigned long flags; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 342 | |
Hannes Reinecke | 83ea0e5 | 2015-12-01 10:16:58 +0100 | [diff] [blame] | 343 | group_id = scsi_vpd_tpg_id(sdev, &rel_port); |
| 344 | if (group_id < 0) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 345 | /* |
| 346 | * Internal error; TPGS supported but required |
| 347 | * VPD identification descriptors not present. |
| 348 | * Disable ALUA support |
| 349 | */ |
| 350 | sdev_printk(KERN_INFO, sdev, |
| 351 | "%s: No target port descriptors found\n", |
| 352 | ALUA_DH_NAME); |
Hannes Reinecke | 9b80dce | 2015-12-01 10:16:44 +0100 | [diff] [blame] | 353 | return SCSI_DH_DEV_UNSUPP; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 354 | } |
Hannes Reinecke | a4253fd | 2016-02-19 09:17:06 +0100 | [diff] [blame] | 355 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 356 | pg = alua_alloc_pg(sdev, group_id, tpgs); |
| 357 | if (IS_ERR(pg)) { |
| 358 | if (PTR_ERR(pg) == -ENOMEM) |
Hannes Reinecke | a4253fd | 2016-02-19 09:17:06 +0100 | [diff] [blame] | 359 | return SCSI_DH_NOMEM; |
| 360 | return SCSI_DH_DEV_UNSUPP; |
| 361 | } |
Hannes Reinecke | fe8b953 | 2016-05-06 10:34:35 +0200 | [diff] [blame] | 362 | if (pg->device_id_len) |
| 363 | sdev_printk(KERN_INFO, sdev, |
| 364 | "%s: device %s port group %x rel port %x\n", |
| 365 | ALUA_DH_NAME, pg->device_id_str, |
| 366 | group_id, rel_port); |
| 367 | else |
| 368 | sdev_printk(KERN_INFO, sdev, |
| 369 | "%s: port group %x rel port %x\n", |
| 370 | ALUA_DH_NAME, group_id, rel_port); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 371 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 372 | /* Check for existing port group references */ |
| 373 | spin_lock(&h->pg_lock); |
| 374 | old_pg = h->pg; |
| 375 | if (old_pg != pg) { |
| 376 | /* port group has changed. Update to new port group */ |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 377 | if (h->pg) { |
| 378 | spin_lock_irqsave(&old_pg->lock, flags); |
| 379 | list_del_rcu(&h->node); |
| 380 | spin_unlock_irqrestore(&old_pg->lock, flags); |
| 381 | } |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 382 | rcu_assign_pointer(h->pg, pg); |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 383 | pg_updated = true; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 384 | } |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 385 | |
| 386 | spin_lock_irqsave(&pg->lock, flags); |
Hannes Reinecke | 851cde9 | 2016-02-19 09:17:12 +0100 | [diff] [blame] | 387 | if (sdev->synchronous_alua) |
| 388 | pg->flags |= ALUA_SYNC_STPG; |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 389 | if (pg_updated) |
| 390 | list_add_rcu(&h->node, &pg->dh_list); |
| 391 | spin_unlock_irqrestore(&pg->lock, flags); |
| 392 | |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 393 | alua_rtpg_queue(h->pg, sdev, NULL, true); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 394 | spin_unlock(&h->pg_lock); |
| 395 | |
| 396 | if (old_pg) |
| 397 | kref_put(&old_pg->kref, release_port_group); |
| 398 | |
| 399 | return SCSI_DH_OK; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 402 | static char print_alua_state(unsigned char state) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 403 | { |
| 404 | switch (state) { |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 405 | case SCSI_ACCESS_STATE_OPTIMAL: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 406 | return 'A'; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 407 | case SCSI_ACCESS_STATE_ACTIVE: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 408 | return 'N'; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 409 | case SCSI_ACCESS_STATE_STANDBY: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 410 | return 'S'; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 411 | case SCSI_ACCESS_STATE_UNAVAILABLE: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 412 | return 'U'; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 413 | case SCSI_ACCESS_STATE_LBA: |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 414 | return 'L'; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 415 | case SCSI_ACCESS_STATE_OFFLINE: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 416 | return 'O'; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 417 | case SCSI_ACCESS_STATE_TRANSITIONING: |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 418 | return 'T'; |
| 419 | default: |
| 420 | return 'X'; |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | static int alua_check_sense(struct scsi_device *sdev, |
| 425 | struct scsi_sense_hdr *sense_hdr) |
| 426 | { |
| 427 | switch (sense_hdr->sense_key) { |
| 428 | case NOT_READY: |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 429 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0a) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 430 | /* |
| 431 | * LUN Not Accessible - ALUA state transition |
| 432 | */ |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 433 | alua_check(sdev, false); |
| 434 | return NEEDS_RETRY; |
| 435 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 436 | break; |
| 437 | case UNIT_ATTENTION: |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 438 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 439 | /* |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 440 | * Power On, Reset, or Bus Device Reset. |
| 441 | * Might have obscured a state transition, |
| 442 | * so schedule a recheck. |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 443 | */ |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 444 | alua_check(sdev, true); |
Mike Anderson | c7dbb62 | 2008-08-12 12:11:57 -0700 | [diff] [blame] | 445 | return ADD_TO_MLQUEUE; |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 446 | } |
Stewart, Sean | c20ee7b | 2013-10-15 15:52:39 +0000 | [diff] [blame] | 447 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x04) |
| 448 | /* |
| 449 | * Device internal reset |
| 450 | */ |
| 451 | return ADD_TO_MLQUEUE; |
Moger, Babu | 410f02d | 2011-12-21 18:01:37 -0500 | [diff] [blame] | 452 | if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x01) |
| 453 | /* |
| 454 | * Mode Parameters Changed |
| 455 | */ |
| 456 | return ADD_TO_MLQUEUE; |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 457 | if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x06) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 458 | /* |
| 459 | * ALUA state changed |
| 460 | */ |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 461 | alua_check(sdev, true); |
Mike Anderson | c7dbb62 | 2008-08-12 12:11:57 -0700 | [diff] [blame] | 462 | return ADD_TO_MLQUEUE; |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 463 | } |
| 464 | if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x07) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 465 | /* |
| 466 | * Implicit ALUA state transition failed |
| 467 | */ |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 468 | alua_check(sdev, true); |
Mike Anderson | c7dbb62 | 2008-08-12 12:11:57 -0700 | [diff] [blame] | 469 | return ADD_TO_MLQUEUE; |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 470 | } |
Moger, Babu | bf81973 | 2011-10-06 13:22:07 -0400 | [diff] [blame] | 471 | if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x03) |
| 472 | /* |
| 473 | * Inquiry data has changed |
| 474 | */ |
| 475 | return ADD_TO_MLQUEUE; |
| 476 | if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x0e) |
Ilgu Hong | 4d086f6 | 2009-01-30 17:00:11 -0600 | [diff] [blame] | 477 | /* |
| 478 | * REPORTED_LUNS_DATA_HAS_CHANGED is reported |
| 479 | * when switching controllers on targets like |
| 480 | * Intel Multi-Flex. We can just retry. |
| 481 | */ |
| 482 | return ADD_TO_MLQUEUE; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 483 | break; |
| 484 | } |
| 485 | |
| 486 | return SCSI_RETURN_NOT_HANDLED; |
| 487 | } |
| 488 | |
| 489 | /* |
Hannes Reinecke | 9d2c303 | 2016-02-19 09:17:15 +0100 | [diff] [blame] | 490 | * alua_tur - Send a TEST UNIT READY |
| 491 | * @sdev: device to which the TEST UNIT READY command should be send |
| 492 | * |
| 493 | * Send a TEST UNIT READY to @sdev to figure out the device state |
| 494 | * Returns SCSI_DH_RETRY if the sense code is NOT READY/ALUA TRANSITIONING, |
| 495 | * SCSI_DH_OK if no error occurred, and SCSI_DH_IO otherwise. |
| 496 | */ |
| 497 | static int alua_tur(struct scsi_device *sdev) |
| 498 | { |
| 499 | struct scsi_sense_hdr sense_hdr; |
| 500 | int retval; |
| 501 | |
| 502 | retval = scsi_test_unit_ready(sdev, ALUA_FAILOVER_TIMEOUT * HZ, |
| 503 | ALUA_FAILOVER_RETRIES, &sense_hdr); |
| 504 | if (sense_hdr.sense_key == NOT_READY && |
| 505 | sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a) |
| 506 | return SCSI_DH_RETRY; |
| 507 | else if (retval) |
| 508 | return SCSI_DH_IO; |
| 509 | else |
| 510 | return SCSI_DH_OK; |
| 511 | } |
| 512 | |
| 513 | /* |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 514 | * alua_rtpg - Evaluate REPORT TARGET GROUP STATES |
| 515 | * @sdev: the device to be evaluated. |
| 516 | * |
| 517 | * Evaluate the Target Port Group State. |
| 518 | * Returns SCSI_DH_DEV_OFFLINED if the path is |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 519 | * found to be unusable. |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 520 | */ |
Hannes Reinecke | 2826140 | 2016-02-19 09:17:07 +0100 | [diff] [blame] | 521 | static int alua_rtpg(struct scsi_device *sdev, struct alua_port_group *pg) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 522 | { |
| 523 | struct scsi_sense_hdr sense_hdr; |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 524 | struct alua_port_group *tmp_pg; |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 525 | int len, k, off, valid_states = 0, bufflen = ALUA_RTPG_SIZE; |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 526 | unsigned char *desc, *buff; |
Hannes Reinecke | 5597caf | 2015-12-01 10:16:48 +0100 | [diff] [blame] | 527 | unsigned err, retval; |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 528 | unsigned int tpg_desc_tbl_off; |
| 529 | unsigned char orig_transition_tmo; |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 530 | unsigned long flags; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 531 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 532 | if (!pg->expiry) { |
| 533 | unsigned long transition_tmo = ALUA_FAILOVER_TIMEOUT * HZ; |
| 534 | |
| 535 | if (pg->transition_tmo) |
| 536 | transition_tmo = pg->transition_tmo * HZ; |
| 537 | |
| 538 | pg->expiry = round_jiffies_up(jiffies + transition_tmo); |
| 539 | } |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 540 | |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 541 | buff = kzalloc(bufflen, GFP_KERNEL); |
| 542 | if (!buff) |
| 543 | return SCSI_DH_DEV_TEMP_BUSY; |
| 544 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 545 | retry: |
Dan Carpenter | a4bd852 | 2016-04-14 21:20:34 +0300 | [diff] [blame] | 546 | err = 0; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 547 | retval = submit_rtpg(sdev, buff, bufflen, &sense_hdr, pg->flags); |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 548 | |
Hannes Reinecke | 5597caf | 2015-12-01 10:16:48 +0100 | [diff] [blame] | 549 | if (retval) { |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 550 | if (!scsi_sense_valid(&sense_hdr)) { |
Hannes Reinecke | 5597caf | 2015-12-01 10:16:48 +0100 | [diff] [blame] | 551 | sdev_printk(KERN_INFO, sdev, |
| 552 | "%s: rtpg failed, result %d\n", |
| 553 | ALUA_DH_NAME, retval); |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 554 | kfree(buff); |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 555 | if (driver_byte(retval) == DRIVER_ERROR) |
Hannes Reinecke | 5597caf | 2015-12-01 10:16:48 +0100 | [diff] [blame] | 556 | return SCSI_DH_DEV_TEMP_BUSY; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 557 | return SCSI_DH_IO; |
Hannes Reinecke | 5597caf | 2015-12-01 10:16:48 +0100 | [diff] [blame] | 558 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 559 | |
Rob Evers | 8e67ce6 | 2012-05-18 14:08:55 -0400 | [diff] [blame] | 560 | /* |
| 561 | * submit_rtpg() has failed on existing arrays |
| 562 | * when requesting extended header info, and |
| 563 | * the array doesn't support extended headers, |
| 564 | * even though it shouldn't according to T10. |
| 565 | * The retry without rtpg_ext_hdr_req set |
| 566 | * handles this. |
| 567 | */ |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 568 | if (!(pg->flags & ALUA_RTPG_EXT_HDR_UNSUPP) && |
Rob Evers | 8e67ce6 | 2012-05-18 14:08:55 -0400 | [diff] [blame] | 569 | sense_hdr.sense_key == ILLEGAL_REQUEST && |
| 570 | sense_hdr.asc == 0x24 && sense_hdr.ascq == 0) { |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 571 | pg->flags |= ALUA_RTPG_EXT_HDR_UNSUPP; |
Rob Evers | 8e67ce6 | 2012-05-18 14:08:55 -0400 | [diff] [blame] | 572 | goto retry; |
| 573 | } |
Hannes Reinecke | e2d817d | 2015-12-01 10:16:54 +0100 | [diff] [blame] | 574 | /* |
| 575 | * Retry on ALUA state transition or if any |
| 576 | * UNIT ATTENTION occurred. |
| 577 | */ |
| 578 | if (sense_hdr.sense_key == NOT_READY && |
| 579 | sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a) |
| 580 | err = SCSI_DH_RETRY; |
| 581 | else if (sense_hdr.sense_key == UNIT_ATTENTION) |
| 582 | err = SCSI_DH_RETRY; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 583 | if (err == SCSI_DH_RETRY && |
| 584 | pg->expiry != 0 && time_before(jiffies, pg->expiry)) { |
Hannes Reinecke | 80bd68d | 2015-12-01 10:16:47 +0100 | [diff] [blame] | 585 | sdev_printk(KERN_ERR, sdev, "%s: rtpg retry\n", |
| 586 | ALUA_DH_NAME); |
| 587 | scsi_print_sense_hdr(sdev, ALUA_DH_NAME, &sense_hdr); |
tang.junhui | 086acff | 2016-09-18 18:05:11 +0800 | [diff] [blame] | 588 | kfree(buff); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 589 | return err; |
Hannes Reinecke | 80bd68d | 2015-12-01 10:16:47 +0100 | [diff] [blame] | 590 | } |
| 591 | sdev_printk(KERN_ERR, sdev, "%s: rtpg failed\n", |
| 592 | ALUA_DH_NAME); |
| 593 | scsi_print_sense_hdr(sdev, ALUA_DH_NAME, &sense_hdr); |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 594 | kfree(buff); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 595 | pg->expiry = 0; |
Hannes Reinecke | 80bd68d | 2015-12-01 10:16:47 +0100 | [diff] [blame] | 596 | return SCSI_DH_IO; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 597 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 598 | |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 599 | len = get_unaligned_be32(&buff[0]) + 4; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 600 | |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 601 | if (len > bufflen) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 602 | /* Resubmit with the correct length */ |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 603 | kfree(buff); |
| 604 | bufflen = len; |
| 605 | buff = kmalloc(bufflen, GFP_KERNEL); |
| 606 | if (!buff) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 607 | sdev_printk(KERN_WARNING, sdev, |
Harvey Harrison | cadbd4a | 2008-07-03 23:47:27 -0700 | [diff] [blame] | 608 | "%s: kmalloc buffer failed\n",__func__); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 609 | /* Temporary failure, bypass */ |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 610 | pg->expiry = 0; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 611 | return SCSI_DH_DEV_TEMP_BUSY; |
| 612 | } |
| 613 | goto retry; |
| 614 | } |
| 615 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 616 | orig_transition_tmo = pg->transition_tmo; |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 617 | if ((buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR && buff[5] != 0) |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 618 | pg->transition_tmo = buff[5]; |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 619 | else |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 620 | pg->transition_tmo = ALUA_FAILOVER_TIMEOUT; |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 621 | |
Hannes Reinecke | 2826140 | 2016-02-19 09:17:07 +0100 | [diff] [blame] | 622 | if (orig_transition_tmo != pg->transition_tmo) { |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 623 | sdev_printk(KERN_INFO, sdev, |
| 624 | "%s: transition timeout set to %d seconds\n", |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 625 | ALUA_DH_NAME, pg->transition_tmo); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 626 | pg->expiry = jiffies + pg->transition_tmo * HZ; |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 627 | } |
| 628 | |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 629 | if ((buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR) |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 630 | tpg_desc_tbl_off = 8; |
| 631 | else |
| 632 | tpg_desc_tbl_off = 4; |
| 633 | |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 634 | for (k = tpg_desc_tbl_off, desc = buff + tpg_desc_tbl_off; |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 635 | k < len; |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 636 | k += off, desc += off) { |
| 637 | u16 group_id = get_unaligned_be16(&desc[2]); |
Rob Evers | 3588c5a | 2012-05-18 14:08:54 -0400 | [diff] [blame] | 638 | |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 639 | spin_lock_irqsave(&port_group_lock, flags); |
| 640 | tmp_pg = alua_find_get_pg(pg->device_id_str, pg->device_id_len, |
| 641 | group_id); |
| 642 | spin_unlock_irqrestore(&port_group_lock, flags); |
| 643 | if (tmp_pg) { |
| 644 | if (spin_trylock_irqsave(&tmp_pg->lock, flags)) { |
| 645 | if ((tmp_pg == pg) || |
| 646 | !(tmp_pg->flags & ALUA_PG_RUNNING)) { |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 647 | struct alua_dh_data *h; |
| 648 | |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 649 | tmp_pg->state = desc[0] & 0x0f; |
| 650 | tmp_pg->pref = desc[0] >> 7; |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 651 | rcu_read_lock(); |
| 652 | list_for_each_entry_rcu(h, |
| 653 | &tmp_pg->dh_list, node) { |
| 654 | /* h->sdev should always be valid */ |
| 655 | BUG_ON(!h->sdev); |
| 656 | h->sdev->access_state = desc[0]; |
| 657 | } |
| 658 | rcu_read_unlock(); |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 659 | } |
| 660 | if (tmp_pg == pg) |
| 661 | valid_states = desc[1]; |
| 662 | spin_unlock_irqrestore(&tmp_pg->lock, flags); |
| 663 | } |
| 664 | kref_put(&tmp_pg->kref, release_port_group); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 665 | } |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 666 | off = 8 + (desc[7] * 4); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 667 | } |
| 668 | |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 669 | spin_lock_irqsave(&pg->lock, flags); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 670 | sdev_printk(KERN_INFO, sdev, |
Moger, Babu | dcd3a75 | 2012-03-27 20:56:08 +0000 | [diff] [blame] | 671 | "%s: port group %02x state %c %s supports %c%c%c%c%c%c%c\n", |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 672 | ALUA_DH_NAME, pg->group_id, print_alua_state(pg->state), |
| 673 | pg->pref ? "preferred" : "non-preferred", |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 674 | valid_states&TPGS_SUPPORT_TRANSITION?'T':'t', |
| 675 | valid_states&TPGS_SUPPORT_OFFLINE?'O':'o', |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 676 | valid_states&TPGS_SUPPORT_LBA_DEPENDENT?'L':'l', |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 677 | valid_states&TPGS_SUPPORT_UNAVAILABLE?'U':'u', |
| 678 | valid_states&TPGS_SUPPORT_STANDBY?'S':'s', |
| 679 | valid_states&TPGS_SUPPORT_NONOPTIMIZED?'N':'n', |
| 680 | valid_states&TPGS_SUPPORT_OPTIMIZED?'A':'a'); |
| 681 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 682 | switch (pg->state) { |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 683 | case SCSI_ACCESS_STATE_TRANSITIONING: |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 684 | if (time_before(jiffies, pg->expiry)) { |
Hannes Reinecke | 2826140 | 2016-02-19 09:17:07 +0100 | [diff] [blame] | 685 | /* State transition, retry */ |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 686 | pg->interval = 2; |
| 687 | err = SCSI_DH_RETRY; |
| 688 | } else { |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 689 | struct alua_dh_data *h; |
| 690 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 691 | /* Transitioning time exceeded, set port to standby */ |
| 692 | err = SCSI_DH_IO; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 693 | pg->state = SCSI_ACCESS_STATE_STANDBY; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 694 | pg->expiry = 0; |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 695 | rcu_read_lock(); |
| 696 | list_for_each_entry_rcu(h, &pg->dh_list, node) { |
| 697 | BUG_ON(!h->sdev); |
| 698 | h->sdev->access_state = |
| 699 | (pg->state & SCSI_ACCESS_STATE_MASK); |
| 700 | if (pg->pref) |
| 701 | h->sdev->access_state |= |
| 702 | SCSI_ACCESS_STATE_PREFERRED; |
| 703 | } |
| 704 | rcu_read_unlock(); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 705 | } |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 706 | break; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 707 | case SCSI_ACCESS_STATE_OFFLINE: |
Bart Van Assche | e47f897 | 2012-08-24 09:08:41 +0000 | [diff] [blame] | 708 | /* Path unusable */ |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 709 | err = SCSI_DH_DEV_OFFLINED; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 710 | pg->expiry = 0; |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 711 | break; |
| 712 | default: |
| 713 | /* Useable path if active */ |
| 714 | err = SCSI_DH_OK; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 715 | pg->expiry = 0; |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 716 | break; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 717 | } |
Hannes Reinecke | c57168a | 2016-02-19 09:17:14 +0100 | [diff] [blame] | 718 | spin_unlock_irqrestore(&pg->lock, flags); |
Hannes Reinecke | c49c834 | 2016-02-19 09:17:03 +0100 | [diff] [blame] | 719 | kfree(buff); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 720 | return err; |
| 721 | } |
| 722 | |
| 723 | /* |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 724 | * alua_stpg - Issue a SET TARGET PORT GROUP command |
| 725 | * |
| 726 | * Issue a SET TARGET PORT GROUP command and evaluate the |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 727 | * response. Returns SCSI_DH_RETRY per default to trigger |
| 728 | * a re-evaluation of the target group state or SCSI_DH_OK |
| 729 | * if no further action needs to be taken. |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 730 | */ |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 731 | static unsigned alua_stpg(struct scsi_device *sdev, struct alua_port_group *pg) |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 732 | { |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 733 | int retval; |
| 734 | struct scsi_sense_hdr sense_hdr; |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 735 | |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 736 | if (!(pg->tpgs & TPGS_MODE_EXPLICIT)) { |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 737 | /* Only implicit ALUA supported, retry */ |
| 738 | return SCSI_DH_RETRY; |
| 739 | } |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 740 | switch (pg->state) { |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 741 | case SCSI_ACCESS_STATE_OPTIMAL: |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 742 | return SCSI_DH_OK; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 743 | case SCSI_ACCESS_STATE_ACTIVE: |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 744 | if ((pg->flags & ALUA_OPTIMIZE_STPG) && |
| 745 | !pg->pref && |
| 746 | (pg->tpgs & TPGS_MODE_IMPLICIT)) |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 747 | return SCSI_DH_OK; |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 748 | break; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 749 | case SCSI_ACCESS_STATE_STANDBY: |
| 750 | case SCSI_ACCESS_STATE_UNAVAILABLE: |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 751 | break; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 752 | case SCSI_ACCESS_STATE_OFFLINE: |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 753 | return SCSI_DH_IO; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 754 | case SCSI_ACCESS_STATE_TRANSITIONING: |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 755 | break; |
| 756 | default: |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 757 | sdev_printk(KERN_INFO, sdev, |
| 758 | "%s: stpg failed, unhandled TPGS state %d", |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 759 | ALUA_DH_NAME, pg->state); |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 760 | return SCSI_DH_NOSYS; |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 761 | } |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 762 | retval = submit_stpg(sdev, pg->group_id, &sense_hdr); |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 763 | |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 764 | if (retval) { |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 765 | if (!scsi_sense_valid(&sense_hdr)) { |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 766 | sdev_printk(KERN_INFO, sdev, |
| 767 | "%s: stpg failed, result %d", |
| 768 | ALUA_DH_NAME, retval); |
Hannes Reinecke | 40bb61a | 2016-02-19 09:17:02 +0100 | [diff] [blame] | 769 | if (driver_byte(retval) == DRIVER_ERROR) |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 770 | return SCSI_DH_DEV_TEMP_BUSY; |
| 771 | } else { |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 772 | sdev_printk(KERN_INFO, sdev, "%s: stpg failed\n", |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 773 | ALUA_DH_NAME); |
| 774 | scsi_print_sense_hdr(sdev, ALUA_DH_NAME, &sense_hdr); |
| 775 | } |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 776 | } |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 777 | /* Retry RTPG */ |
| 778 | return SCSI_DH_RETRY; |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 779 | } |
| 780 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 781 | static void alua_rtpg_work(struct work_struct *work) |
| 782 | { |
| 783 | struct alua_port_group *pg = |
| 784 | container_of(work, struct alua_port_group, rtpg_work.work); |
| 785 | struct scsi_device *sdev; |
| 786 | LIST_HEAD(qdata_list); |
| 787 | int err = SCSI_DH_OK; |
| 788 | struct alua_queue_data *qdata, *tmp; |
| 789 | unsigned long flags; |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 790 | struct workqueue_struct *alua_wq = kaluad_wq; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 791 | |
| 792 | spin_lock_irqsave(&pg->lock, flags); |
| 793 | sdev = pg->rtpg_sdev; |
| 794 | if (!sdev) { |
| 795 | WARN_ON(pg->flags & ALUA_PG_RUN_RTPG); |
| 796 | WARN_ON(pg->flags & ALUA_PG_RUN_STPG); |
| 797 | spin_unlock_irqrestore(&pg->lock, flags); |
| 798 | return; |
| 799 | } |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 800 | if (pg->flags & ALUA_SYNC_STPG) |
| 801 | alua_wq = kaluad_sync_wq; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 802 | pg->flags |= ALUA_PG_RUNNING; |
| 803 | if (pg->flags & ALUA_PG_RUN_RTPG) { |
Hannes Reinecke | 9d2c303 | 2016-02-19 09:17:15 +0100 | [diff] [blame] | 804 | int state = pg->state; |
| 805 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 806 | pg->flags &= ~ALUA_PG_RUN_RTPG; |
| 807 | spin_unlock_irqrestore(&pg->lock, flags); |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 808 | if (state == SCSI_ACCESS_STATE_TRANSITIONING) { |
Hannes Reinecke | 9d2c303 | 2016-02-19 09:17:15 +0100 | [diff] [blame] | 809 | if (alua_tur(sdev) == SCSI_DH_RETRY) { |
| 810 | spin_lock_irqsave(&pg->lock, flags); |
| 811 | pg->flags &= ~ALUA_PG_RUNNING; |
| 812 | pg->flags |= ALUA_PG_RUN_RTPG; |
| 813 | spin_unlock_irqrestore(&pg->lock, flags); |
| 814 | queue_delayed_work(alua_wq, &pg->rtpg_work, |
| 815 | pg->interval * HZ); |
| 816 | return; |
| 817 | } |
| 818 | /* Send RTPG on failure or if TUR indicates SUCCESS */ |
| 819 | } |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 820 | err = alua_rtpg(sdev, pg); |
| 821 | spin_lock_irqsave(&pg->lock, flags); |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 822 | if (err == SCSI_DH_RETRY || pg->flags & ALUA_PG_RUN_RTPG) { |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 823 | pg->flags &= ~ALUA_PG_RUNNING; |
| 824 | pg->flags |= ALUA_PG_RUN_RTPG; |
| 825 | spin_unlock_irqrestore(&pg->lock, flags); |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 826 | queue_delayed_work(alua_wq, &pg->rtpg_work, |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 827 | pg->interval * HZ); |
| 828 | return; |
| 829 | } |
| 830 | if (err != SCSI_DH_OK) |
| 831 | pg->flags &= ~ALUA_PG_RUN_STPG; |
| 832 | } |
| 833 | if (pg->flags & ALUA_PG_RUN_STPG) { |
| 834 | pg->flags &= ~ALUA_PG_RUN_STPG; |
| 835 | spin_unlock_irqrestore(&pg->lock, flags); |
| 836 | err = alua_stpg(sdev, pg); |
| 837 | spin_lock_irqsave(&pg->lock, flags); |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 838 | if (err == SCSI_DH_RETRY || pg->flags & ALUA_PG_RUN_RTPG) { |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 839 | pg->flags |= ALUA_PG_RUN_RTPG; |
| 840 | pg->interval = 0; |
| 841 | pg->flags &= ~ALUA_PG_RUNNING; |
| 842 | spin_unlock_irqrestore(&pg->lock, flags); |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 843 | queue_delayed_work(alua_wq, &pg->rtpg_work, |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 844 | pg->interval * HZ); |
| 845 | return; |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | list_splice_init(&pg->rtpg_list, &qdata_list); |
| 850 | pg->rtpg_sdev = NULL; |
| 851 | spin_unlock_irqrestore(&pg->lock, flags); |
| 852 | |
| 853 | list_for_each_entry_safe(qdata, tmp, &qdata_list, entry) { |
| 854 | list_del(&qdata->entry); |
| 855 | if (qdata->callback_fn) |
| 856 | qdata->callback_fn(qdata->callback_data, err); |
| 857 | kfree(qdata); |
| 858 | } |
| 859 | spin_lock_irqsave(&pg->lock, flags); |
| 860 | pg->flags &= ~ALUA_PG_RUNNING; |
| 861 | spin_unlock_irqrestore(&pg->lock, flags); |
| 862 | scsi_device_put(sdev); |
| 863 | kref_put(&pg->kref, release_port_group); |
| 864 | } |
| 865 | |
| 866 | static void alua_rtpg_queue(struct alua_port_group *pg, |
| 867 | struct scsi_device *sdev, |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 868 | struct alua_queue_data *qdata, bool force) |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 869 | { |
| 870 | int start_queue = 0; |
| 871 | unsigned long flags; |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 872 | struct workqueue_struct *alua_wq = kaluad_wq; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 873 | |
| 874 | if (!pg) |
| 875 | return; |
| 876 | |
| 877 | spin_lock_irqsave(&pg->lock, flags); |
| 878 | if (qdata) { |
| 879 | list_add_tail(&qdata->entry, &pg->rtpg_list); |
| 880 | pg->flags |= ALUA_PG_RUN_STPG; |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 881 | force = true; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 882 | } |
| 883 | if (pg->rtpg_sdev == NULL) { |
| 884 | pg->interval = 0; |
| 885 | pg->flags |= ALUA_PG_RUN_RTPG; |
| 886 | kref_get(&pg->kref); |
| 887 | pg->rtpg_sdev = sdev; |
| 888 | scsi_device_get(sdev); |
| 889 | start_queue = 1; |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 890 | } else if (!(pg->flags & ALUA_PG_RUN_RTPG) && force) { |
| 891 | pg->flags |= ALUA_PG_RUN_RTPG; |
| 892 | /* Do not queue if the worker is already running */ |
| 893 | if (!(pg->flags & ALUA_PG_RUNNING)) { |
| 894 | kref_get(&pg->kref); |
| 895 | start_queue = 1; |
| 896 | } |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 897 | } |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 898 | |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 899 | if (pg->flags & ALUA_SYNC_STPG) |
| 900 | alua_wq = kaluad_sync_wq; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 901 | spin_unlock_irqrestore(&pg->lock, flags); |
| 902 | |
| 903 | if (start_queue && |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 904 | !queue_delayed_work(alua_wq, &pg->rtpg_work, |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 905 | msecs_to_jiffies(ALUA_RTPG_DELAY_MSECS))) { |
| 906 | scsi_device_put(sdev); |
| 907 | kref_put(&pg->kref, release_port_group); |
| 908 | } |
| 909 | } |
| 910 | |
Hannes Reinecke | f2ecf13 | 2016-02-19 09:16:59 +0100 | [diff] [blame] | 911 | /* |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 912 | * alua_initialize - Initialize ALUA state |
| 913 | * @sdev: the device to be initialized |
| 914 | * |
| 915 | * For the prep_fn to work correctly we have |
| 916 | * to initialize the ALUA state for the device. |
| 917 | */ |
| 918 | static int alua_initialize(struct scsi_device *sdev, struct alua_dh_data *h) |
| 919 | { |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 920 | int err = SCSI_DH_DEV_UNSUPP, tpgs; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 921 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 922 | mutex_lock(&h->init_mutex); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 923 | tpgs = alua_check_tpgs(sdev); |
Hannes Reinecke | a4253fd | 2016-02-19 09:17:06 +0100 | [diff] [blame] | 924 | if (tpgs != TPGS_MODE_NONE) |
| 925 | err = alua_check_vpd(sdev, h, tpgs); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 926 | h->init_error = err; |
| 927 | mutex_unlock(&h->init_mutex); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 928 | return err; |
| 929 | } |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 930 | /* |
| 931 | * alua_set_params - set/unset the optimize flag |
| 932 | * @sdev: device on the path to be activated |
| 933 | * params - parameters in the following format |
| 934 | * "no_of_params\0param1\0param2\0param3\0...\0" |
| 935 | * For example, to set the flag pass the following parameters |
| 936 | * from multipath.conf |
| 937 | * hardware_handler "2 alua 1" |
| 938 | */ |
| 939 | static int alua_set_params(struct scsi_device *sdev, const char *params) |
| 940 | { |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 941 | struct alua_dh_data *h = sdev->handler_data; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 942 | struct alua_port_group __rcu *pg = NULL; |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 943 | unsigned int optimize = 0, argc; |
| 944 | const char *p = params; |
| 945 | int result = SCSI_DH_OK; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 946 | unsigned long flags; |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 947 | |
| 948 | if ((sscanf(params, "%u", &argc) != 1) || (argc != 1)) |
| 949 | return -EINVAL; |
| 950 | |
| 951 | while (*p++) |
| 952 | ; |
| 953 | if ((sscanf(p, "%u", &optimize) != 1) || (optimize > 1)) |
| 954 | return -EINVAL; |
| 955 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 956 | rcu_read_lock(); |
| 957 | pg = rcu_dereference(h->pg); |
| 958 | if (!pg) { |
| 959 | rcu_read_unlock(); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 960 | return -ENXIO; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 961 | } |
| 962 | spin_lock_irqsave(&pg->lock, flags); |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 963 | if (optimize) |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 964 | pg->flags |= ALUA_OPTIMIZE_STPG; |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 965 | else |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 966 | pg->flags &= ~ALUA_OPTIMIZE_STPG; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 967 | spin_unlock_irqrestore(&pg->lock, flags); |
| 968 | rcu_read_unlock(); |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 969 | |
| 970 | return result; |
| 971 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 972 | |
| 973 | /* |
| 974 | * alua_activate - activate a path |
| 975 | * @sdev: device on the path to be activated |
| 976 | * |
| 977 | * We're currently switching the port group to be activated only and |
| 978 | * let the array figure out the rest. |
| 979 | * There may be other arrays which require us to switch all port groups |
| 980 | * based on a certain policy. But until we actually encounter them it |
| 981 | * should be okay. |
| 982 | */ |
Chandra Seetharaman | 3ae31f6 | 2009-10-21 09:22:46 -0700 | [diff] [blame] | 983 | static int alua_activate(struct scsi_device *sdev, |
| 984 | activate_complete fn, void *data) |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 985 | { |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 986 | struct alua_dh_data *h = sdev->handler_data; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 987 | int err = SCSI_DH_OK; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 988 | struct alua_queue_data *qdata; |
| 989 | struct alua_port_group __rcu *pg; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 990 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 991 | qdata = kzalloc(sizeof(*qdata), GFP_KERNEL); |
| 992 | if (!qdata) { |
| 993 | err = SCSI_DH_RES_TEMP_UNAVAIL; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 994 | goto out; |
| 995 | } |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 996 | qdata->callback_fn = fn; |
| 997 | qdata->callback_data = data; |
| 998 | |
| 999 | mutex_lock(&h->init_mutex); |
| 1000 | rcu_read_lock(); |
| 1001 | pg = rcu_dereference(h->pg); |
| 1002 | if (!pg || !kref_get_unless_zero(&pg->kref)) { |
| 1003 | rcu_read_unlock(); |
| 1004 | kfree(qdata); |
| 1005 | err = h->init_error; |
| 1006 | mutex_unlock(&h->init_mutex); |
| 1007 | goto out; |
| 1008 | } |
| 1009 | fn = NULL; |
| 1010 | rcu_read_unlock(); |
| 1011 | mutex_unlock(&h->init_mutex); |
| 1012 | |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 1013 | alua_rtpg_queue(pg, sdev, qdata, true); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1014 | kref_put(&pg->kref, release_port_group); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1015 | out: |
Hannes Reinecke | b246075 | 2016-02-19 09:17:00 +0100 | [diff] [blame] | 1016 | if (fn) |
Chandra Seetharaman | 3ae31f6 | 2009-10-21 09:22:46 -0700 | [diff] [blame] | 1017 | fn(data, err); |
| 1018 | return 0; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1019 | } |
| 1020 | |
| 1021 | /* |
Hannes Reinecke | 2b35865 | 2016-02-19 09:17:13 +0100 | [diff] [blame] | 1022 | * alua_check - check path status |
| 1023 | * @sdev: device on the path to be checked |
| 1024 | * |
| 1025 | * Check the device status |
| 1026 | */ |
| 1027 | static void alua_check(struct scsi_device *sdev, bool force) |
| 1028 | { |
| 1029 | struct alua_dh_data *h = sdev->handler_data; |
| 1030 | struct alua_port_group *pg; |
| 1031 | |
| 1032 | rcu_read_lock(); |
| 1033 | pg = rcu_dereference(h->pg); |
| 1034 | if (!pg || !kref_get_unless_zero(&pg->kref)) { |
| 1035 | rcu_read_unlock(); |
| 1036 | return; |
| 1037 | } |
| 1038 | rcu_read_unlock(); |
| 1039 | |
| 1040 | alua_rtpg_queue(pg, sdev, NULL, force); |
| 1041 | kref_put(&pg->kref, release_port_group); |
| 1042 | } |
| 1043 | |
| 1044 | /* |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1045 | * alua_prep_fn - request callback |
| 1046 | * |
| 1047 | * Fail I/O to all paths not in state |
| 1048 | * active/optimized or active/non-optimized. |
| 1049 | */ |
| 1050 | static int alua_prep_fn(struct scsi_device *sdev, struct request *req) |
| 1051 | { |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 1052 | struct alua_dh_data *h = sdev->handler_data; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1053 | struct alua_port_group __rcu *pg; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 1054 | unsigned char state = SCSI_ACCESS_STATE_OPTIMAL; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1055 | int ret = BLKPREP_OK; |
| 1056 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1057 | rcu_read_lock(); |
| 1058 | pg = rcu_dereference(h->pg); |
| 1059 | if (pg) |
| 1060 | state = pg->state; |
| 1061 | rcu_read_unlock(); |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 1062 | if (state == SCSI_ACCESS_STATE_TRANSITIONING) |
Hannes Reinecke | 69723d1 | 2010-09-24 15:57:04 +0200 | [diff] [blame] | 1063 | ret = BLKPREP_DEFER; |
Hannes Reinecke | 5115fc7 | 2016-03-03 07:54:08 +0100 | [diff] [blame] | 1064 | else if (state != SCSI_ACCESS_STATE_OPTIMAL && |
| 1065 | state != SCSI_ACCESS_STATE_ACTIVE && |
| 1066 | state != SCSI_ACCESS_STATE_LBA) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1067 | ret = BLKPREP_KILL; |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame^] | 1068 | req->rq_flags |= RQF_QUIET; |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1069 | } |
| 1070 | return ret; |
| 1071 | |
| 1072 | } |
| 1073 | |
Hannes Reinecke | d3d3289 | 2016-02-19 09:17:16 +0100 | [diff] [blame] | 1074 | static void alua_rescan(struct scsi_device *sdev) |
| 1075 | { |
| 1076 | struct alua_dh_data *h = sdev->handler_data; |
| 1077 | |
| 1078 | alua_initialize(sdev, h); |
| 1079 | } |
| 1080 | |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1081 | /* |
| 1082 | * alua_bus_attach - Attach device handler |
| 1083 | * @sdev: device to be attached to |
| 1084 | */ |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 1085 | static int alua_bus_attach(struct scsi_device *sdev) |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1086 | { |
| 1087 | struct alua_dh_data *h; |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 1088 | int err, ret = -EINVAL; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1089 | |
| 1090 | h = kzalloc(sizeof(*h) , GFP_KERNEL); |
| 1091 | if (!h) |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 1092 | return -ENOMEM; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1093 | spin_lock_init(&h->pg_lock); |
| 1094 | rcu_assign_pointer(h->pg, NULL); |
| 1095 | h->init_error = SCSI_DH_OK; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1096 | h->sdev = sdev; |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 1097 | INIT_LIST_HEAD(&h->node); |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1098 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1099 | mutex_init(&h->init_mutex); |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1100 | err = alua_initialize(sdev, h); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 1101 | if (err == SCSI_DH_NOMEM) |
| 1102 | ret = -ENOMEM; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1103 | if (err != SCSI_DH_OK && err != SCSI_DH_DEV_OFFLINED) |
| 1104 | goto failed; |
| 1105 | |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 1106 | sdev->handler_data = h; |
| 1107 | return 0; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1108 | failed: |
| 1109 | kfree(h); |
Hannes Reinecke | 43394c6 | 2016-02-19 09:17:04 +0100 | [diff] [blame] | 1110 | return ret; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
| 1113 | /* |
| 1114 | * alua_bus_detach - Detach device handler |
| 1115 | * @sdev: device to be detached from |
| 1116 | */ |
| 1117 | static void alua_bus_detach(struct scsi_device *sdev) |
| 1118 | { |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 1119 | struct alua_dh_data *h = sdev->handler_data; |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1120 | struct alua_port_group *pg; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1121 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1122 | spin_lock(&h->pg_lock); |
| 1123 | pg = h->pg; |
| 1124 | rcu_assign_pointer(h->pg, NULL); |
| 1125 | h->sdev = NULL; |
| 1126 | spin_unlock(&h->pg_lock); |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 1127 | if (pg) { |
Bart Van Assche | 38c3159 | 2016-03-28 11:14:04 -0700 | [diff] [blame] | 1128 | spin_lock_irq(&pg->lock); |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 1129 | list_del_rcu(&h->node); |
Bart Van Assche | 38c3159 | 2016-03-28 11:14:04 -0700 | [diff] [blame] | 1130 | spin_unlock_irq(&pg->lock); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1131 | kref_put(&pg->kref, release_port_group); |
Hannes Reinecke | cb0a168 | 2016-03-03 07:54:09 +0100 | [diff] [blame] | 1132 | } |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 1133 | sdev->handler_data = NULL; |
Christoph Hellwig | 1d52032 | 2014-09-14 11:08:21 -0700 | [diff] [blame] | 1134 | kfree(h); |
| 1135 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1136 | |
| 1137 | static struct scsi_device_handler alua_dh = { |
| 1138 | .name = ALUA_DH_NAME, |
| 1139 | .module = THIS_MODULE, |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1140 | .attach = alua_bus_attach, |
| 1141 | .detach = alua_bus_detach, |
| 1142 | .prep_fn = alua_prep_fn, |
| 1143 | .check_sense = alua_check_sense, |
| 1144 | .activate = alua_activate, |
Hannes Reinecke | d3d3289 | 2016-02-19 09:17:16 +0100 | [diff] [blame] | 1145 | .rescan = alua_rescan, |
Moger, Babu | 4335d09 | 2012-03-27 20:55:49 +0000 | [diff] [blame] | 1146 | .set_params = alua_set_params, |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1147 | }; |
| 1148 | |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1149 | static int __init alua_init(void) |
| 1150 | { |
| 1151 | int r; |
| 1152 | |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1153 | kaluad_wq = alloc_workqueue("kaluad", WQ_MEM_RECLAIM, 0); |
| 1154 | if (!kaluad_wq) { |
| 1155 | /* Temporary failure, bypass */ |
| 1156 | return SCSI_DH_DEV_TEMP_BUSY; |
| 1157 | } |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 1158 | kaluad_sync_wq = create_workqueue("kaluad_sync"); |
| 1159 | if (!kaluad_sync_wq) { |
| 1160 | destroy_workqueue(kaluad_wq); |
| 1161 | return SCSI_DH_DEV_TEMP_BUSY; |
| 1162 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1163 | r = scsi_register_device_handler(&alua_dh); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1164 | if (r != 0) { |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1165 | printk(KERN_ERR "%s: Failed to register scsi device handler", |
| 1166 | ALUA_DH_NAME); |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 1167 | destroy_workqueue(kaluad_sync_wq); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1168 | destroy_workqueue(kaluad_wq); |
| 1169 | } |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1170 | return r; |
| 1171 | } |
| 1172 | |
| 1173 | static void __exit alua_exit(void) |
| 1174 | { |
| 1175 | scsi_unregister_device_handler(&alua_dh); |
Hannes Reinecke | 00642a1 | 2016-02-19 09:17:11 +0100 | [diff] [blame] | 1176 | destroy_workqueue(kaluad_sync_wq); |
Hannes Reinecke | 03197b6 | 2016-02-19 09:17:10 +0100 | [diff] [blame] | 1177 | destroy_workqueue(kaluad_wq); |
Hannes Reinecke | 057ea7c | 2008-07-17 16:53:21 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
| 1180 | module_init(alua_init); |
| 1181 | module_exit(alua_exit); |
| 1182 | |
| 1183 | MODULE_DESCRIPTION("DM Multipath ALUA support"); |
| 1184 | MODULE_AUTHOR("Hannes Reinecke <hare@suse.de>"); |
| 1185 | MODULE_LICENSE("GPL"); |
| 1186 | MODULE_VERSION(ALUA_DH_VER); |