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[SCSI] scsi_dh: add hp sw device handler
This patch provides the device handler to support the older hp boxes which cannot be upgraded. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie
James Bottomley
parent
fbd7ab3eb5
commit
f6dd337ee4
@ -16,3 +16,11 @@ config SCSI_DH_RDAC
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depends on SCSI_DH
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help
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If you have a LSI RDAC select y. Otherwise, say N.
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config SCSI_DH_HP_SW
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tristate "HP/COMPAQ MSA Device Handler"
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depends on SCSI_DH
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help
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If you have a HP/COMPAQ MSA device that requires START_STOP to
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be sent to start it and cannot upgrade the firmware then select y.
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Otherwise, say N.
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@ -3,3 +3,4 @@
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#
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obj-$(CONFIG_SCSI_DH) += scsi_dh.o
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obj-$(CONFIG_SCSI_DH_RDAC) += scsi_dh_rdac.o
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obj-$(CONFIG_SCSI_DH_HP_SW) += scsi_dh_hp_sw.o
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202
drivers/scsi/device_handler/scsi_dh_hp_sw.c
Normal file
202
drivers/scsi/device_handler/scsi_dh_hp_sw.c
Normal file
@ -0,0 +1,202 @@
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/*
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* Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be
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* upgraded.
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*
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2006 Mike Christie
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <scsi/scsi.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dh.h>
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#define HP_SW_NAME "hp_sw"
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#define HP_SW_TIMEOUT (60 * HZ)
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#define HP_SW_RETRIES 3
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struct hp_sw_dh_data {
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unsigned char sense[SCSI_SENSE_BUFFERSIZE];
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int retries;
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};
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static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
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{
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struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
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BUG_ON(scsi_dh_data == NULL);
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return ((struct hp_sw_dh_data *) scsi_dh_data->buf);
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}
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static int hp_sw_done(struct scsi_device *sdev)
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{
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struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
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struct scsi_sense_hdr sshdr;
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int rc;
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sdev_printk(KERN_INFO, sdev, "hp_sw_done\n");
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rc = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
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if (!rc)
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goto done;
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switch (sshdr.sense_key) {
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case NOT_READY:
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if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) {
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rc = SCSI_DH_RETRY;
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h->retries++;
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break;
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}
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/* fall through */
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default:
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h->retries++;
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rc = SCSI_DH_IMM_RETRY;
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}
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done:
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if (rc == SCSI_DH_OK || rc == SCSI_DH_IO)
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h->retries = 0;
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else if (h->retries > HP_SW_RETRIES) {
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h->retries = 0;
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rc = SCSI_DH_IO;
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}
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return rc;
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}
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static int hp_sw_activate(struct scsi_device *sdev)
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{
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struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
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struct request *req;
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int ret = SCSI_DH_RES_TEMP_UNAVAIL;
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req = blk_get_request(sdev->request_queue, WRITE, GFP_ATOMIC);
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if (!req)
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goto done;
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sdev_printk(KERN_INFO, sdev, "sending START_STOP.");
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req->cmd_type = REQ_TYPE_BLOCK_PC;
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req->cmd_flags |= REQ_FAILFAST;
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req->cmd_len = COMMAND_SIZE(START_STOP);
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memset(req->cmd, 0, MAX_COMMAND_SIZE);
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req->cmd[0] = START_STOP;
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req->cmd[4] = 1; /* Start spin cycle */
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req->timeout = HP_SW_TIMEOUT;
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req->sense = h->sense;
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memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE);
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req->sense_len = 0;
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ret = blk_execute_rq(req->q, NULL, req, 1);
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if (!ret) /* SUCCESS */
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ret = hp_sw_done(sdev);
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else
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ret = SCSI_DH_IO;
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done:
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return ret;
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}
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static const struct {
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char *vendor;
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char *model;
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} hp_sw_dh_data_list[] = {
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{"COMPAQ", "MSA"},
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{"HP", "HSV"},
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{"DEC", "HSG80"},
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{NULL, NULL},
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};
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static int hp_sw_bus_notify(struct notifier_block *, unsigned long, void *);
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static struct scsi_device_handler hp_sw_dh = {
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.name = HP_SW_NAME,
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.module = THIS_MODULE,
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.nb.notifier_call = hp_sw_bus_notify,
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.activate = hp_sw_activate,
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};
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static int hp_sw_bus_notify(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct device *dev = data;
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struct scsi_device *sdev = to_scsi_device(dev);
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struct scsi_dh_data *scsi_dh_data;
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int i, found = 0;
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unsigned long flags;
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if (action == BUS_NOTIFY_ADD_DEVICE) {
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for (i = 0; hp_sw_dh_data_list[i].vendor; i++) {
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if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor,
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strlen(hp_sw_dh_data_list[i].vendor)) &&
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!strncmp(sdev->model, hp_sw_dh_data_list[i].model,
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strlen(hp_sw_dh_data_list[i].model))) {
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found = 1;
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break;
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}
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}
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if (!found)
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goto out;
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scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
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+ sizeof(struct hp_sw_dh_data) , GFP_KERNEL);
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if (!scsi_dh_data) {
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sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n",
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HP_SW_NAME);
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goto out;
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}
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scsi_dh_data->scsi_dh = &hp_sw_dh;
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spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
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sdev->scsi_dh_data = scsi_dh_data;
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spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
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try_module_get(THIS_MODULE);
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sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME);
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} else if (action == BUS_NOTIFY_DEL_DEVICE) {
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if (sdev->scsi_dh_data == NULL ||
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sdev->scsi_dh_data->scsi_dh != &hp_sw_dh)
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goto out;
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spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
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scsi_dh_data = sdev->scsi_dh_data;
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sdev->scsi_dh_data = NULL;
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spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
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module_put(THIS_MODULE);
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sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", HP_SW_NAME);
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kfree(scsi_dh_data);
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}
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out:
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return 0;
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}
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static int __init hp_sw_init(void)
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{
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return scsi_register_device_handler(&hp_sw_dh);
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}
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static void __exit hp_sw_exit(void)
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{
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scsi_unregister_device_handler(&hp_sw_dh);
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}
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module_init(hp_sw_init);
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module_exit(hp_sw_exit);
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MODULE_DESCRIPTION("HP MSA 1000");
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MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu");
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MODULE_LICENSE("GPL");
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