Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be |
| 3 | * upgraded. |
| 4 | * |
| 5 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
| 6 | * Copyright (C) 2006 Mike Christie |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; see the file COPYING. If not, write to |
| 20 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <scsi/scsi.h> |
| 24 | #include <scsi/scsi_dbg.h> |
| 25 | #include <scsi/scsi_eh.h> |
| 26 | #include <scsi/scsi_dh.h> |
| 27 | |
| 28 | #define HP_SW_NAME "hp_sw" |
| 29 | |
| 30 | #define HP_SW_TIMEOUT (60 * HZ) |
| 31 | #define HP_SW_RETRIES 3 |
| 32 | |
| 33 | struct hp_sw_dh_data { |
| 34 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
| 35 | int retries; |
| 36 | }; |
| 37 | |
| 38 | static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev) |
| 39 | { |
| 40 | struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; |
| 41 | BUG_ON(scsi_dh_data == NULL); |
| 42 | return ((struct hp_sw_dh_data *) scsi_dh_data->buf); |
| 43 | } |
| 44 | |
| 45 | static int hp_sw_done(struct scsi_device *sdev) |
| 46 | { |
| 47 | struct hp_sw_dh_data *h = get_hp_sw_data(sdev); |
| 48 | struct scsi_sense_hdr sshdr; |
| 49 | int rc; |
| 50 | |
| 51 | sdev_printk(KERN_INFO, sdev, "hp_sw_done\n"); |
| 52 | |
| 53 | rc = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sshdr); |
| 54 | if (!rc) |
| 55 | goto done; |
| 56 | switch (sshdr.sense_key) { |
| 57 | case NOT_READY: |
| 58 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) { |
| 59 | rc = SCSI_DH_RETRY; |
| 60 | h->retries++; |
| 61 | break; |
| 62 | } |
| 63 | /* fall through */ |
| 64 | default: |
| 65 | h->retries++; |
| 66 | rc = SCSI_DH_IMM_RETRY; |
| 67 | } |
| 68 | |
| 69 | done: |
| 70 | if (rc == SCSI_DH_OK || rc == SCSI_DH_IO) |
| 71 | h->retries = 0; |
| 72 | else if (h->retries > HP_SW_RETRIES) { |
| 73 | h->retries = 0; |
| 74 | rc = SCSI_DH_IO; |
| 75 | } |
| 76 | return rc; |
| 77 | } |
| 78 | |
| 79 | static int hp_sw_activate(struct scsi_device *sdev) |
| 80 | { |
| 81 | struct hp_sw_dh_data *h = get_hp_sw_data(sdev); |
| 82 | struct request *req; |
| 83 | int ret = SCSI_DH_RES_TEMP_UNAVAIL; |
| 84 | |
| 85 | req = blk_get_request(sdev->request_queue, WRITE, GFP_ATOMIC); |
| 86 | if (!req) |
| 87 | goto done; |
| 88 | |
| 89 | sdev_printk(KERN_INFO, sdev, "sending START_STOP."); |
| 90 | |
| 91 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
| 92 | req->cmd_flags |= REQ_FAILFAST; |
| 93 | req->cmd_len = COMMAND_SIZE(START_STOP); |
| 94 | memset(req->cmd, 0, MAX_COMMAND_SIZE); |
| 95 | req->cmd[0] = START_STOP; |
| 96 | req->cmd[4] = 1; /* Start spin cycle */ |
| 97 | req->timeout = HP_SW_TIMEOUT; |
| 98 | req->sense = h->sense; |
| 99 | memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); |
| 100 | req->sense_len = 0; |
| 101 | |
| 102 | ret = blk_execute_rq(req->q, NULL, req, 1); |
| 103 | if (!ret) /* SUCCESS */ |
| 104 | ret = hp_sw_done(sdev); |
| 105 | else |
| 106 | ret = SCSI_DH_IO; |
| 107 | done: |
| 108 | return ret; |
| 109 | } |
| 110 | |
| 111 | static const struct { |
| 112 | char *vendor; |
| 113 | char *model; |
| 114 | } hp_sw_dh_data_list[] = { |
| 115 | {"COMPAQ", "MSA"}, |
| 116 | {"HP", "HSV"}, |
| 117 | {"DEC", "HSG80"}, |
| 118 | {NULL, NULL}, |
| 119 | }; |
| 120 | |
| 121 | static int hp_sw_bus_notify(struct notifier_block *, unsigned long, void *); |
| 122 | |
| 123 | static struct scsi_device_handler hp_sw_dh = { |
| 124 | .name = HP_SW_NAME, |
| 125 | .module = THIS_MODULE, |
| 126 | .nb.notifier_call = hp_sw_bus_notify, |
| 127 | .activate = hp_sw_activate, |
| 128 | }; |
| 129 | |
| 130 | static int hp_sw_bus_notify(struct notifier_block *nb, |
| 131 | unsigned long action, void *data) |
| 132 | { |
| 133 | struct device *dev = data; |
Chandra Seetharaman | 33af79d | 2008-07-16 17:35:08 -0700 | [diff] [blame] | 134 | struct scsi_device *sdev; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 135 | struct scsi_dh_data *scsi_dh_data; |
| 136 | int i, found = 0; |
| 137 | unsigned long flags; |
| 138 | |
Chandra Seetharaman | 33af79d | 2008-07-16 17:35:08 -0700 | [diff] [blame] | 139 | if (!scsi_is_sdev_device(dev)) |
| 140 | return 0; |
| 141 | |
| 142 | sdev = to_scsi_device(dev); |
| 143 | |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 144 | if (action == BUS_NOTIFY_ADD_DEVICE) { |
| 145 | for (i = 0; hp_sw_dh_data_list[i].vendor; i++) { |
| 146 | if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor, |
| 147 | strlen(hp_sw_dh_data_list[i].vendor)) && |
| 148 | !strncmp(sdev->model, hp_sw_dh_data_list[i].model, |
| 149 | strlen(hp_sw_dh_data_list[i].model))) { |
| 150 | found = 1; |
| 151 | break; |
| 152 | } |
| 153 | } |
| 154 | if (!found) |
| 155 | goto out; |
| 156 | |
| 157 | scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) |
| 158 | + sizeof(struct hp_sw_dh_data) , GFP_KERNEL); |
| 159 | if (!scsi_dh_data) { |
| 160 | sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n", |
| 161 | HP_SW_NAME); |
| 162 | goto out; |
| 163 | } |
| 164 | |
| 165 | scsi_dh_data->scsi_dh = &hp_sw_dh; |
| 166 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
| 167 | sdev->scsi_dh_data = scsi_dh_data; |
| 168 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); |
| 169 | try_module_get(THIS_MODULE); |
| 170 | |
| 171 | sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME); |
| 172 | } else if (action == BUS_NOTIFY_DEL_DEVICE) { |
| 173 | if (sdev->scsi_dh_data == NULL || |
| 174 | sdev->scsi_dh_data->scsi_dh != &hp_sw_dh) |
| 175 | goto out; |
| 176 | |
| 177 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
| 178 | scsi_dh_data = sdev->scsi_dh_data; |
| 179 | sdev->scsi_dh_data = NULL; |
| 180 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); |
| 181 | module_put(THIS_MODULE); |
| 182 | |
| 183 | sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", HP_SW_NAME); |
| 184 | |
| 185 | kfree(scsi_dh_data); |
| 186 | } |
| 187 | |
| 188 | out: |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static int __init hp_sw_init(void) |
| 193 | { |
| 194 | return scsi_register_device_handler(&hp_sw_dh); |
| 195 | } |
| 196 | |
| 197 | static void __exit hp_sw_exit(void) |
| 198 | { |
| 199 | scsi_unregister_device_handler(&hp_sw_dh); |
| 200 | } |
| 201 | |
| 202 | module_init(hp_sw_init); |
| 203 | module_exit(hp_sw_exit); |
| 204 | |
| 205 | MODULE_DESCRIPTION("HP MSA 1000"); |
| 206 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu"); |
| 207 | MODULE_LICENSE("GPL"); |