[SCSI] scsi_dh: add hp sw device handler
authorMike Christie <michaelc@cs.wisc.edu>
Thu, 1 May 2008 21:49:59 +0000 (14:49 -0700)
committerJames Bottomley <James.Bottomley@HansenPartnership.com>
Thu, 5 Jun 2008 14:23:40 +0000 (09:23 -0500)
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>
drivers/scsi/device_handler/Kconfig
drivers/scsi/device_handler/Makefile
drivers/scsi/device_handler/scsi_dh_hp_sw.c [new file with mode: 0644]

index 404f37732627c2c87d23c294fd9a545271cdefcc..61578d84fa6e8239774a10215ff2ad0bde260846 100644 (file)
@@ -16,3 +16,11 @@ config SCSI_DH_RDAC
        depends on SCSI_DH
        help
        If you have a LSI RDAC select y. Otherwise, say N.
+
+config SCSI_DH_HP_SW
+       tristate "HP/COMPAQ MSA Device Handler"
+       depends on SCSI_DH
+       help
+       If you have a HP/COMPAQ MSA device that requires START_STOP to
+       be sent to start it and cannot upgrade the firmware then select y.
+       Otherwise, say N.
index 1a42b34983185e1030d2e9a6ad89886adf6da1d2..08ec1943f19ed3fe07092271ccca0d213168eed2 100644 (file)
@@ -3,3 +3,4 @@
 #
 obj-$(CONFIG_SCSI_DH)          += scsi_dh.o
 obj-$(CONFIG_SCSI_DH_RDAC)     += scsi_dh_rdac.o
+obj-$(CONFIG_SCSI_DH_HP_SW)    += scsi_dh_hp_sw.o
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
new file mode 100644 (file)
index 0000000..12ceab7
--- /dev/null
@@ -0,0 +1,202 @@
+/*
+ * 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 = to_scsi_device(dev);
+       struct scsi_dh_data *scsi_dh_data;
+       int i, found = 0;
+       unsigned long flags;
+
+       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");