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/*
* Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be
* upgraded.
*
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
* Copyright (C) 2006 Mike Christie
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dh.h>
#define HP_SW_NAME "hp_sw"
#define HP_SW_TIMEOUT (60 * HZ)
#define HP_SW_RETRIES 3
struct hp_sw_dh_data {
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
int retries;
};
static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
BUG_ON(scsi_dh_data == NULL);
return ((struct hp_sw_dh_data *) scsi_dh_data->buf);
}
static int hp_sw_done(struct scsi_device *sdev)
{
struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
struct scsi_sense_hdr sshdr;
int rc;
sdev_printk(KERN_INFO, sdev, "hp_sw_done\n");
rc = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
if (!rc)
goto done;
switch (sshdr.sense_key) {
case NOT_READY:
if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) {
rc = SCSI_DH_RETRY;
h->retries++;
break;
}
/* fall through */
default:
h->retries++;
rc = SCSI_DH_IMM_RETRY;
}
done:
if (rc == SCSI_DH_OK || rc == SCSI_DH_IO)
h->retries = 0;
else if (h->retries > HP_SW_RETRIES) {
h->retries = 0;
rc = SCSI_DH_IO;
}
return rc;
}
static int hp_sw_activate(struct scsi_device *sdev)
{
struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
struct request *req;
int ret = SCSI_DH_RES_TEMP_UNAVAIL;
req = blk_get_request(sdev->request_queue, WRITE, GFP_ATOMIC);
if (!req)
goto done;
sdev_printk(KERN_INFO, sdev, "sending START_STOP.");
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= REQ_FAILFAST;
req->cmd_len = COMMAND_SIZE(START_STOP);
memset(req->cmd, 0, MAX_COMMAND_SIZE);
req->cmd[0] = START_STOP;
req->cmd[4] = 1; /* Start spin cycle */
req->timeout = HP_SW_TIMEOUT;
req->sense = h->sense;
memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE);
req->sense_len = 0;
ret = blk_execute_rq(req->q, NULL, req, 1);
if (!ret) /* SUCCESS */
ret = hp_sw_done(sdev);
else
ret = SCSI_DH_IO;
done:
return ret;
}
static const struct {
char *vendor;
char *model;
} hp_sw_dh_data_list[] = {
{"COMPAQ", "MSA"},
{"HP", "HSV"},
{"DEC", "HSG80"},
{NULL, NULL},
};
static int hp_sw_bus_notify(struct notifier_block *, unsigned long, void *);
static struct scsi_device_handler hp_sw_dh = {
.name = HP_SW_NAME,
.module = THIS_MODULE,
.nb.notifier_call = hp_sw_bus_notify,
.activate = hp_sw_activate,
};
static int hp_sw_bus_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
struct scsi_device *sdev;
struct scsi_dh_data *scsi_dh_data;
int i, found = 0;
unsigned long flags;
if (!scsi_is_sdev_device(dev))
return 0;
sdev = to_scsi_device(dev);
if (action == BUS_NOTIFY_ADD_DEVICE) {
for (i = 0; hp_sw_dh_data_list[i].vendor; i++) {
if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor,
strlen(hp_sw_dh_data_list[i].vendor)) &&
!strncmp(sdev->model, hp_sw_dh_data_list[i].model,
strlen(hp_sw_dh_data_list[i].model))) {
found = 1;
break;
}
}
if (!found)
goto out;
scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ sizeof(struct hp_sw_dh_data) , GFP_KERNEL);
if (!scsi_dh_data) {
sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n",
HP_SW_NAME);
goto out;
}
scsi_dh_data->scsi_dh = &hp_sw_dh;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
sdev->scsi_dh_data = scsi_dh_data;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
try_module_get(THIS_MODULE);
sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME);
} else if (action == BUS_NOTIFY_DEL_DEVICE) {
if (sdev->scsi_dh_data == NULL ||
sdev->scsi_dh_data->scsi_dh != &hp_sw_dh)
goto out;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
scsi_dh_data = sdev->scsi_dh_data;
sdev->scsi_dh_data = NULL;
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
module_put(THIS_MODULE);
sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", HP_SW_NAME);
kfree(scsi_dh_data);
}
out:
return 0;
}
static int __init hp_sw_init(void)
{
return scsi_register_device_handler(&hp_sw_dh);
}
static void __exit hp_sw_exit(void)
{
scsi_unregister_device_handler(&hp_sw_dh);
}
module_init(hp_sw_init);
module_exit(hp_sw_exit);
MODULE_DESCRIPTION("HP MSA 1000");
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu");
MODULE_LICENSE("GPL");
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