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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/scsi/device_handler
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/scsi/device_handler')
-rw-r--r--kernel/drivers/scsi/device_handler/Kconfig40
-rw-r--r--kernel/drivers/scsi/device_handler/Makefile8
-rw-r--r--kernel/drivers/scsi/device_handler/scsi_dh.c621
-rw-r--r--kernel/drivers/scsi/device_handler/scsi_dh_alua.c905
-rw-r--r--kernel/drivers/scsi/device_handler/scsi_dh_emc.c725
-rw-r--r--kernel/drivers/scsi/device_handler/scsi_dh_hp_sw.c400
-rw-r--r--kernel/drivers/scsi/device_handler/scsi_dh_rdac.c937
7 files changed, 3636 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/device_handler/Kconfig b/kernel/drivers/scsi/device_handler/Kconfig
new file mode 100644
index 000000000..69abd0ad4
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/Kconfig
@@ -0,0 +1,40 @@
+#
+# SCSI Device Handler configuration
+#
+
+menuconfig SCSI_DH
+ tristate "SCSI Device Handlers"
+ depends on SCSI
+ default n
+ help
+ SCSI Device Handlers provide device specific support for
+ devices utilized in multipath configurations. Say Y here to
+ select support for specific hardware.
+
+config SCSI_DH_RDAC
+ tristate "LSI RDAC Device Handler"
+ 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.
+
+config SCSI_DH_EMC
+ tristate "EMC CLARiiON Device Handler"
+ depends on SCSI_DH
+ help
+ If you have a EMC CLARiiON select y. Otherwise, say N.
+
+config SCSI_DH_ALUA
+ tristate "SPC-3 ALUA Device Handler"
+ depends on SCSI_DH
+ help
+ SCSI Device handler for generic SPC-3 Asymmetric Logical Unit
+ Access (ALUA).
+
diff --git a/kernel/drivers/scsi/device_handler/Makefile b/kernel/drivers/scsi/device_handler/Makefile
new file mode 100644
index 000000000..e1d2ea083
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/Makefile
@@ -0,0 +1,8 @@
+#
+# SCSI Device Handler
+#
+obj-$(CONFIG_SCSI_DH) += scsi_dh.o
+obj-$(CONFIG_SCSI_DH_RDAC) += scsi_dh_rdac.o
+obj-$(CONFIG_SCSI_DH_HP_SW) += scsi_dh_hp_sw.o
+obj-$(CONFIG_SCSI_DH_EMC) += scsi_dh_emc.o
+obj-$(CONFIG_SCSI_DH_ALUA) += scsi_dh_alua.o
diff --git a/kernel/drivers/scsi/device_handler/scsi_dh.c b/kernel/drivers/scsi/device_handler/scsi_dh.c
new file mode 100644
index 000000000..1efebc9ee
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/scsi_dh.c
@@ -0,0 +1,621 @@
+/*
+ * SCSI device handler infrastruture.
+ *
+ * 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 of the License, 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; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2007
+ * Authors:
+ * Chandra Seetharaman <sekharan@us.ibm.com>
+ * Mike Anderson <andmike@linux.vnet.ibm.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <scsi/scsi_dh.h>
+#include "../scsi_priv.h"
+
+static DEFINE_SPINLOCK(list_lock);
+static LIST_HEAD(scsi_dh_list);
+
+static struct scsi_device_handler *get_device_handler(const char *name)
+{
+ struct scsi_device_handler *tmp, *found = NULL;
+
+ spin_lock(&list_lock);
+ list_for_each_entry(tmp, &scsi_dh_list, list) {
+ if (!strncmp(tmp->name, name, strlen(tmp->name))) {
+ found = tmp;
+ break;
+ }
+ }
+ spin_unlock(&list_lock);
+ return found;
+}
+
+/*
+ * device_handler_match_function - Match a device handler to a device
+ * @sdev - SCSI device to be tested
+ *
+ * Tests @sdev against the match function of all registered device_handler.
+ * Returns the found device handler or NULL if not found.
+ */
+static struct scsi_device_handler *
+device_handler_match_function(struct scsi_device *sdev)
+{
+ struct scsi_device_handler *tmp_dh, *found_dh = NULL;
+
+ spin_lock(&list_lock);
+ list_for_each_entry(tmp_dh, &scsi_dh_list, list) {
+ if (tmp_dh->match && tmp_dh->match(sdev)) {
+ found_dh = tmp_dh;
+ break;
+ }
+ }
+ spin_unlock(&list_lock);
+ return found_dh;
+}
+
+/*
+ * device_handler_match - Attach a device handler to a device
+ * @scsi_dh - The device handler to match against or NULL
+ * @sdev - SCSI device to be tested against @scsi_dh
+ *
+ * Tests @sdev against the device handler @scsi_dh or against
+ * all registered device_handler if @scsi_dh == NULL.
+ * Returns the found device handler or NULL if not found.
+ */
+static struct scsi_device_handler *
+device_handler_match(struct scsi_device_handler *scsi_dh,
+ struct scsi_device *sdev)
+{
+ struct scsi_device_handler *found_dh;
+
+ found_dh = device_handler_match_function(sdev);
+
+ if (scsi_dh && found_dh != scsi_dh)
+ found_dh = NULL;
+
+ return found_dh;
+}
+
+/*
+ * scsi_dh_handler_attach - Attach a device handler to a device
+ * @sdev - SCSI device the device handler should attach to
+ * @scsi_dh - The device handler to attach
+ */
+static int scsi_dh_handler_attach(struct scsi_device *sdev,
+ struct scsi_device_handler *scsi_dh)
+{
+ struct scsi_dh_data *d;
+
+ if (sdev->scsi_dh_data) {
+ if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
+ return -EBUSY;
+
+ kref_get(&sdev->scsi_dh_data->kref);
+ return 0;
+ }
+
+ if (!try_module_get(scsi_dh->module))
+ return -EINVAL;
+
+ d = scsi_dh->attach(sdev);
+ if (IS_ERR(d)) {
+ sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%ld)\n",
+ scsi_dh->name, PTR_ERR(d));
+ module_put(scsi_dh->module);
+ return PTR_ERR(d);
+ }
+
+ d->scsi_dh = scsi_dh;
+ kref_init(&d->kref);
+ d->sdev = sdev;
+
+ spin_lock_irq(sdev->request_queue->queue_lock);
+ sdev->scsi_dh_data = d;
+ spin_unlock_irq(sdev->request_queue->queue_lock);
+ return 0;
+}
+
+static void __detach_handler (struct kref *kref)
+{
+ struct scsi_dh_data *scsi_dh_data =
+ container_of(kref, struct scsi_dh_data, kref);
+ struct scsi_device_handler *scsi_dh = scsi_dh_data->scsi_dh;
+ struct scsi_device *sdev = scsi_dh_data->sdev;
+
+ scsi_dh->detach(sdev);
+
+ spin_lock_irq(sdev->request_queue->queue_lock);
+ sdev->scsi_dh_data = NULL;
+ spin_unlock_irq(sdev->request_queue->queue_lock);
+
+ sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", scsi_dh->name);
+ module_put(scsi_dh->module);
+}
+
+/*
+ * scsi_dh_handler_detach - Detach a device handler from a device
+ * @sdev - SCSI device the device handler should be detached from
+ * @scsi_dh - Device handler to be detached
+ *
+ * Detach from a device handler. If a device handler is specified,
+ * only detach if the currently attached handler matches @scsi_dh.
+ */
+static void scsi_dh_handler_detach(struct scsi_device *sdev,
+ struct scsi_device_handler *scsi_dh)
+{
+ if (!sdev->scsi_dh_data)
+ return;
+
+ if (scsi_dh && scsi_dh != sdev->scsi_dh_data->scsi_dh)
+ return;
+
+ if (!scsi_dh)
+ scsi_dh = sdev->scsi_dh_data->scsi_dh;
+
+ if (scsi_dh)
+ kref_put(&sdev->scsi_dh_data->kref, __detach_handler);
+}
+
+/*
+ * Functions for sysfs attribute 'dh_state'
+ */
+static ssize_t
+store_dh_state(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_device_handler *scsi_dh;
+ int err = -EINVAL;
+
+ if (sdev->sdev_state == SDEV_CANCEL ||
+ sdev->sdev_state == SDEV_DEL)
+ return -ENODEV;
+
+ if (!sdev->scsi_dh_data) {
+ /*
+ * Attach to a device handler
+ */
+ if (!(scsi_dh = get_device_handler(buf)))
+ return err;
+ err = scsi_dh_handler_attach(sdev, scsi_dh);
+ } else {
+ scsi_dh = sdev->scsi_dh_data->scsi_dh;
+ if (!strncmp(buf, "detach", 6)) {
+ /*
+ * Detach from a device handler
+ */
+ scsi_dh_handler_detach(sdev, scsi_dh);
+ err = 0;
+ } else if (!strncmp(buf, "activate", 8)) {
+ /*
+ * Activate a device handler
+ */
+ if (scsi_dh->activate)
+ err = scsi_dh->activate(sdev, NULL, NULL);
+ else
+ err = 0;
+ }
+ }
+
+ return err<0?err:count;
+}
+
+static ssize_t
+show_dh_state(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+
+ if (!sdev->scsi_dh_data)
+ return snprintf(buf, 20, "detached\n");
+
+ return snprintf(buf, 20, "%s\n", sdev->scsi_dh_data->scsi_dh->name);
+}
+
+static struct device_attribute scsi_dh_state_attr =
+ __ATTR(dh_state, S_IRUGO | S_IWUSR, show_dh_state,
+ store_dh_state);
+
+/*
+ * scsi_dh_sysfs_attr_add - Callback for scsi_init_dh
+ */
+static int scsi_dh_sysfs_attr_add(struct device *dev, void *data)
+{
+ struct scsi_device *sdev;
+ int err;
+
+ if (!scsi_is_sdev_device(dev))
+ return 0;
+
+ sdev = to_scsi_device(dev);
+
+ err = device_create_file(&sdev->sdev_gendev,
+ &scsi_dh_state_attr);
+
+ return 0;
+}
+
+/*
+ * scsi_dh_sysfs_attr_remove - Callback for scsi_exit_dh
+ */
+static int scsi_dh_sysfs_attr_remove(struct device *dev, void *data)
+{
+ struct scsi_device *sdev;
+
+ if (!scsi_is_sdev_device(dev))
+ return 0;
+
+ sdev = to_scsi_device(dev);
+
+ device_remove_file(&sdev->sdev_gendev,
+ &scsi_dh_state_attr);
+
+ return 0;
+}
+
+/*
+ * scsi_dh_notifier - notifier chain callback
+ */
+static int scsi_dh_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct scsi_device *sdev;
+ int err = 0;
+ struct scsi_device_handler *devinfo = NULL;
+
+ if (!scsi_is_sdev_device(dev))
+ return 0;
+
+ sdev = to_scsi_device(dev);
+
+ if (action == BUS_NOTIFY_ADD_DEVICE) {
+ err = device_create_file(dev, &scsi_dh_state_attr);
+ /* don't care about err */
+ devinfo = device_handler_match(NULL, sdev);
+ if (devinfo)
+ err = scsi_dh_handler_attach(sdev, devinfo);
+ } else if (action == BUS_NOTIFY_DEL_DEVICE) {
+ device_remove_file(dev, &scsi_dh_state_attr);
+ scsi_dh_handler_detach(sdev, NULL);
+ }
+ return err;
+}
+
+/*
+ * scsi_dh_notifier_add - Callback for scsi_register_device_handler
+ */
+static int scsi_dh_notifier_add(struct device *dev, void *data)
+{
+ struct scsi_device_handler *scsi_dh = data;
+ struct scsi_device *sdev;
+
+ if (!scsi_is_sdev_device(dev))
+ return 0;
+
+ if (!get_device(dev))
+ return 0;
+
+ sdev = to_scsi_device(dev);
+
+ if (device_handler_match(scsi_dh, sdev))
+ scsi_dh_handler_attach(sdev, scsi_dh);
+
+ put_device(dev);
+
+ return 0;
+}
+
+/*
+ * scsi_dh_notifier_remove - Callback for scsi_unregister_device_handler
+ */
+static int scsi_dh_notifier_remove(struct device *dev, void *data)
+{
+ struct scsi_device_handler *scsi_dh = data;
+ struct scsi_device *sdev;
+
+ if (!scsi_is_sdev_device(dev))
+ return 0;
+
+ if (!get_device(dev))
+ return 0;
+
+ sdev = to_scsi_device(dev);
+
+ scsi_dh_handler_detach(sdev, scsi_dh);
+
+ put_device(dev);
+
+ return 0;
+}
+
+/*
+ * scsi_register_device_handler - register a device handler personality
+ * module.
+ * @scsi_dh - device handler to be registered.
+ *
+ * Returns 0 on success, -EBUSY if handler already registered.
+ */
+int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
+{
+
+ if (get_device_handler(scsi_dh->name))
+ return -EBUSY;
+
+ if (!scsi_dh->attach || !scsi_dh->detach)
+ return -EINVAL;
+
+ spin_lock(&list_lock);
+ list_add(&scsi_dh->list, &scsi_dh_list);
+ spin_unlock(&list_lock);
+
+ bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh, scsi_dh_notifier_add);
+ printk(KERN_INFO "%s: device handler registered\n", scsi_dh->name);
+
+ return SCSI_DH_OK;
+}
+EXPORT_SYMBOL_GPL(scsi_register_device_handler);
+
+/*
+ * scsi_unregister_device_handler - register a device handler personality
+ * module.
+ * @scsi_dh - device handler to be unregistered.
+ *
+ * Returns 0 on success, -ENODEV if handler not registered.
+ */
+int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
+{
+
+ if (!get_device_handler(scsi_dh->name))
+ return -ENODEV;
+
+ bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh,
+ scsi_dh_notifier_remove);
+
+ spin_lock(&list_lock);
+ list_del(&scsi_dh->list);
+ spin_unlock(&list_lock);
+ printk(KERN_INFO "%s: device handler unregistered\n", scsi_dh->name);
+
+ return SCSI_DH_OK;
+}
+EXPORT_SYMBOL_GPL(scsi_unregister_device_handler);
+
+/*
+ * scsi_dh_activate - activate the path associated with the scsi_device
+ * corresponding to the given request queue.
+ * Returns immediately without waiting for activation to be completed.
+ * @q - Request queue that is associated with the scsi_device to be
+ * activated.
+ * @fn - Function to be called upon completion of the activation.
+ * Function fn is called with data (below) and the error code.
+ * Function fn may be called from the same calling context. So,
+ * do not hold the lock in the caller which may be needed in fn.
+ * @data - data passed to the function fn upon completion.
+ *
+ */
+int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
+{
+ int err = 0;
+ unsigned long flags;
+ struct scsi_device *sdev;
+ struct scsi_device_handler *scsi_dh = NULL;
+ struct device *dev = NULL;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ sdev = q->queuedata;
+ if (!sdev) {
+ spin_unlock_irqrestore(q->queue_lock, flags);
+ err = SCSI_DH_NOSYS;
+ if (fn)
+ fn(data, err);
+ return err;
+ }
+
+ if (sdev->scsi_dh_data)
+ scsi_dh = sdev->scsi_dh_data->scsi_dh;
+ dev = get_device(&sdev->sdev_gendev);
+ if (!scsi_dh || !dev ||
+ sdev->sdev_state == SDEV_CANCEL ||
+ sdev->sdev_state == SDEV_DEL)
+ err = SCSI_DH_NOSYS;
+ if (sdev->sdev_state == SDEV_OFFLINE)
+ err = SCSI_DH_DEV_OFFLINED;
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ if (err) {
+ if (fn)
+ fn(data, err);
+ goto out;
+ }
+
+ if (scsi_dh->activate)
+ err = scsi_dh->activate(sdev, fn, data);
+out:
+ put_device(dev);
+ return err;
+}
+EXPORT_SYMBOL_GPL(scsi_dh_activate);
+
+/*
+ * scsi_dh_set_params - set the parameters for the device as per the
+ * string specified in params.
+ * @q - Request queue that is associated with the scsi_device for
+ * which the parameters to be set.
+ * @params - parameters in the following format
+ * "no_of_params\0param1\0param2\0param3\0...\0"
+ * for example, string for 2 parameters with value 10 and 21
+ * is specified as "2\010\021\0".
+ */
+int scsi_dh_set_params(struct request_queue *q, const char *params)
+{
+ int err = -SCSI_DH_NOSYS;
+ unsigned long flags;
+ struct scsi_device *sdev;
+ struct scsi_device_handler *scsi_dh = NULL;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ sdev = q->queuedata;
+ if (sdev && sdev->scsi_dh_data)
+ scsi_dh = sdev->scsi_dh_data->scsi_dh;
+ if (scsi_dh && scsi_dh->set_params && get_device(&sdev->sdev_gendev))
+ err = 0;
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ if (err)
+ return err;
+ err = scsi_dh->set_params(sdev, params);
+ put_device(&sdev->sdev_gendev);
+ return err;
+}
+EXPORT_SYMBOL_GPL(scsi_dh_set_params);
+
+/*
+ * scsi_dh_handler_exist - Return TRUE(1) if a device handler exists for
+ * the given name. FALSE(0) otherwise.
+ * @name - name of the device handler.
+ */
+int scsi_dh_handler_exist(const char *name)
+{
+ return (get_device_handler(name) != NULL);
+}
+EXPORT_SYMBOL_GPL(scsi_dh_handler_exist);
+
+/*
+ * scsi_dh_attach - Attach device handler
+ * @q - Request queue that is associated with the scsi_device
+ * the handler should be attached to
+ * @name - name of the handler to attach
+ */
+int scsi_dh_attach(struct request_queue *q, const char *name)
+{
+ unsigned long flags;
+ struct scsi_device *sdev;
+ struct scsi_device_handler *scsi_dh;
+ int err = 0;
+
+ scsi_dh = get_device_handler(name);
+ if (!scsi_dh)
+ return -EINVAL;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ sdev = q->queuedata;
+ if (!sdev || !get_device(&sdev->sdev_gendev))
+ err = -ENODEV;
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ if (!err) {
+ err = scsi_dh_handler_attach(sdev, scsi_dh);
+ put_device(&sdev->sdev_gendev);
+ }
+ return err;
+}
+EXPORT_SYMBOL_GPL(scsi_dh_attach);
+
+/*
+ * scsi_dh_detach - Detach device handler
+ * @q - Request queue that is associated with the scsi_device
+ * the handler should be detached from
+ *
+ * This function will detach the device handler only
+ * if the sdev is not part of the internal list, ie
+ * if it has been attached manually.
+ */
+void scsi_dh_detach(struct request_queue *q)
+{
+ unsigned long flags;
+ struct scsi_device *sdev;
+ struct scsi_device_handler *scsi_dh = NULL;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ sdev = q->queuedata;
+ if (!sdev || !get_device(&sdev->sdev_gendev))
+ sdev = NULL;
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ if (!sdev)
+ return;
+
+ if (sdev->scsi_dh_data) {
+ scsi_dh = sdev->scsi_dh_data->scsi_dh;
+ scsi_dh_handler_detach(sdev, scsi_dh);
+ }
+ put_device(&sdev->sdev_gendev);
+}
+EXPORT_SYMBOL_GPL(scsi_dh_detach);
+
+/*
+ * scsi_dh_attached_handler_name - Get attached device handler's name
+ * @q - Request queue that is associated with the scsi_device
+ * that may have a device handler attached
+ * @gfp - the GFP mask used in the kmalloc() call when allocating memory
+ *
+ * Returns name of attached handler, NULL if no handler is attached.
+ * Caller must take care to free the returned string.
+ */
+const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp)
+{
+ unsigned long flags;
+ struct scsi_device *sdev;
+ const char *handler_name = NULL;
+
+ spin_lock_irqsave(q->queue_lock, flags);
+ sdev = q->queuedata;
+ if (!sdev || !get_device(&sdev->sdev_gendev))
+ sdev = NULL;
+ spin_unlock_irqrestore(q->queue_lock, flags);
+
+ if (!sdev)
+ return NULL;
+
+ if (sdev->scsi_dh_data)
+ handler_name = kstrdup(sdev->scsi_dh_data->scsi_dh->name, gfp);
+
+ put_device(&sdev->sdev_gendev);
+ return handler_name;
+}
+EXPORT_SYMBOL_GPL(scsi_dh_attached_handler_name);
+
+static struct notifier_block scsi_dh_nb = {
+ .notifier_call = scsi_dh_notifier
+};
+
+static int __init scsi_dh_init(void)
+{
+ int r;
+
+ r = bus_register_notifier(&scsi_bus_type, &scsi_dh_nb);
+
+ if (!r)
+ bus_for_each_dev(&scsi_bus_type, NULL, NULL,
+ scsi_dh_sysfs_attr_add);
+
+ return r;
+}
+
+static void __exit scsi_dh_exit(void)
+{
+ bus_for_each_dev(&scsi_bus_type, NULL, NULL,
+ scsi_dh_sysfs_attr_remove);
+ bus_unregister_notifier(&scsi_bus_type, &scsi_dh_nb);
+}
+
+module_init(scsi_dh_init);
+module_exit(scsi_dh_exit);
+
+MODULE_DESCRIPTION("SCSI device handler");
+MODULE_AUTHOR("Chandra Seetharaman <sekharan@us.ibm.com>");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/scsi/device_handler/scsi_dh_alua.c b/kernel/drivers/scsi/device_handler/scsi_dh_alua.c
new file mode 100644
index 000000000..854b568b9
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -0,0 +1,905 @@
+/*
+ * Generic SCSI-3 ALUA SCSI Device Handler
+ *
+ * Copyright (C) 2007-2010 Hannes Reinecke, SUSE Linux Products GmbH.
+ * All rights reserved.
+ *
+ * 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 of the License, 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; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dh.h>
+
+#define ALUA_DH_NAME "alua"
+#define ALUA_DH_VER "1.3"
+
+#define TPGS_STATE_OPTIMIZED 0x0
+#define TPGS_STATE_NONOPTIMIZED 0x1
+#define TPGS_STATE_STANDBY 0x2
+#define TPGS_STATE_UNAVAILABLE 0x3
+#define TPGS_STATE_LBA_DEPENDENT 0x4
+#define TPGS_STATE_OFFLINE 0xe
+#define TPGS_STATE_TRANSITIONING 0xf
+
+#define TPGS_SUPPORT_NONE 0x00
+#define TPGS_SUPPORT_OPTIMIZED 0x01
+#define TPGS_SUPPORT_NONOPTIMIZED 0x02
+#define TPGS_SUPPORT_STANDBY 0x04
+#define TPGS_SUPPORT_UNAVAILABLE 0x08
+#define TPGS_SUPPORT_LBA_DEPENDENT 0x10
+#define TPGS_SUPPORT_OFFLINE 0x40
+#define TPGS_SUPPORT_TRANSITION 0x80
+
+#define RTPG_FMT_MASK 0x70
+#define RTPG_FMT_EXT_HDR 0x10
+
+#define TPGS_MODE_UNINITIALIZED -1
+#define TPGS_MODE_NONE 0x0
+#define TPGS_MODE_IMPLICIT 0x1
+#define TPGS_MODE_EXPLICIT 0x2
+
+#define ALUA_INQUIRY_SIZE 36
+#define ALUA_FAILOVER_TIMEOUT 60
+#define ALUA_FAILOVER_RETRIES 5
+
+/* flags passed from user level */
+#define ALUA_OPTIMIZE_STPG 1
+
+struct alua_dh_data {
+ struct scsi_dh_data dh_data;
+ int group_id;
+ int rel_port;
+ int tpgs;
+ int state;
+ int pref;
+ unsigned flags; /* used for optimizing STPG */
+ unsigned char inq[ALUA_INQUIRY_SIZE];
+ unsigned char *buff;
+ int bufflen;
+ unsigned char transition_tmo;
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ int senselen;
+ struct scsi_device *sdev;
+ activate_complete callback_fn;
+ void *callback_data;
+};
+
+#define ALUA_POLICY_SWITCH_CURRENT 0
+#define ALUA_POLICY_SWITCH_ALL 1
+
+static char print_alua_state(int);
+static int alua_check_sense(struct scsi_device *, struct scsi_sense_hdr *);
+
+static inline struct alua_dh_data *get_alua_data(struct scsi_device *sdev)
+{
+ return container_of(sdev->scsi_dh_data, struct alua_dh_data, dh_data);
+}
+
+static int realloc_buffer(struct alua_dh_data *h, unsigned len)
+{
+ if (h->buff && h->buff != h->inq)
+ kfree(h->buff);
+
+ h->buff = kmalloc(len, GFP_NOIO);
+ if (!h->buff) {
+ h->buff = h->inq;
+ h->bufflen = ALUA_INQUIRY_SIZE;
+ return 1;
+ }
+ h->bufflen = len;
+ return 0;
+}
+
+static struct request *get_alua_req(struct scsi_device *sdev,
+ void *buffer, unsigned buflen, int rw)
+{
+ struct request *rq;
+ struct request_queue *q = sdev->request_queue;
+
+ rq = blk_get_request(q, rw, GFP_NOIO);
+
+ if (IS_ERR(rq)) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: blk_get_request failed\n", __func__);
+ return NULL;
+ }
+ blk_rq_set_block_pc(rq);
+
+ if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
+ blk_put_request(rq);
+ sdev_printk(KERN_INFO, sdev,
+ "%s: blk_rq_map_kern failed\n", __func__);
+ return NULL;
+ }
+
+ rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
+ rq->retries = ALUA_FAILOVER_RETRIES;
+ rq->timeout = ALUA_FAILOVER_TIMEOUT * HZ;
+
+ return rq;
+}
+
+/*
+ * submit_vpd_inquiry - Issue an INQUIRY VPD page 0x83 command
+ * @sdev: sdev the command should be sent to
+ */
+static int submit_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
+{
+ struct request *rq;
+ int err = SCSI_DH_RES_TEMP_UNAVAIL;
+
+ rq = get_alua_req(sdev, h->buff, h->bufflen, READ);
+ if (!rq)
+ goto done;
+
+ /* Prepare the command. */
+ rq->cmd[0] = INQUIRY;
+ rq->cmd[1] = 1;
+ rq->cmd[2] = 0x83;
+ rq->cmd[4] = h->bufflen;
+ rq->cmd_len = COMMAND_SIZE(INQUIRY);
+
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = h->senselen = 0;
+
+ err = blk_execute_rq(rq->q, NULL, rq, 1);
+ if (err == -EIO) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: evpd inquiry failed with %x\n",
+ ALUA_DH_NAME, rq->errors);
+ h->senselen = rq->sense_len;
+ err = SCSI_DH_IO;
+ }
+ blk_put_request(rq);
+done:
+ return err;
+}
+
+/*
+ * submit_rtpg - Issue a REPORT TARGET GROUP STATES command
+ * @sdev: sdev the command should be sent to
+ */
+static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h,
+ bool rtpg_ext_hdr_req)
+{
+ struct request *rq;
+ int err = SCSI_DH_RES_TEMP_UNAVAIL;
+
+ rq = get_alua_req(sdev, h->buff, h->bufflen, READ);
+ if (!rq)
+ goto done;
+
+ /* Prepare the command. */
+ rq->cmd[0] = MAINTENANCE_IN;
+ if (rtpg_ext_hdr_req)
+ rq->cmd[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
+ else
+ rq->cmd[1] = MI_REPORT_TARGET_PGS;
+ rq->cmd[6] = (h->bufflen >> 24) & 0xff;
+ rq->cmd[7] = (h->bufflen >> 16) & 0xff;
+ rq->cmd[8] = (h->bufflen >> 8) & 0xff;
+ rq->cmd[9] = h->bufflen & 0xff;
+ rq->cmd_len = COMMAND_SIZE(MAINTENANCE_IN);
+
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = h->senselen = 0;
+
+ err = blk_execute_rq(rq->q, NULL, rq, 1);
+ if (err == -EIO) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: rtpg failed with %x\n",
+ ALUA_DH_NAME, rq->errors);
+ h->senselen = rq->sense_len;
+ err = SCSI_DH_IO;
+ }
+ blk_put_request(rq);
+done:
+ return err;
+}
+
+/*
+ * alua_stpg - Evaluate SET TARGET GROUP STATES
+ * @sdev: the device to be evaluated
+ * @state: the new target group state
+ *
+ * Send a SET TARGET GROUP STATES command to the device.
+ * We only have to test here if we should resubmit the command;
+ * any other error is assumed as a failure.
+ */
+static void stpg_endio(struct request *req, int error)
+{
+ struct alua_dh_data *h = req->end_io_data;
+ struct scsi_sense_hdr sense_hdr;
+ unsigned err = SCSI_DH_OK;
+
+ if (host_byte(req->errors) != DID_OK ||
+ msg_byte(req->errors) != COMMAND_COMPLETE) {
+ err = SCSI_DH_IO;
+ goto done;
+ }
+
+ if (req->sense_len > 0) {
+ err = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
+ &sense_hdr);
+ if (!err) {
+ err = SCSI_DH_IO;
+ goto done;
+ }
+ err = alua_check_sense(h->sdev, &sense_hdr);
+ if (err == ADD_TO_MLQUEUE) {
+ err = SCSI_DH_RETRY;
+ goto done;
+ }
+ sdev_printk(KERN_INFO, h->sdev,
+ "%s: stpg sense code: %02x/%02x/%02x\n",
+ ALUA_DH_NAME, sense_hdr.sense_key,
+ sense_hdr.asc, sense_hdr.ascq);
+ err = SCSI_DH_IO;
+ } else if (error)
+ err = SCSI_DH_IO;
+
+ if (err == SCSI_DH_OK) {
+ h->state = TPGS_STATE_OPTIMIZED;
+ sdev_printk(KERN_INFO, h->sdev,
+ "%s: port group %02x switched to state %c\n",
+ ALUA_DH_NAME, h->group_id,
+ print_alua_state(h->state));
+ }
+done:
+ req->end_io_data = NULL;
+ __blk_put_request(req->q, req);
+ if (h->callback_fn) {
+ h->callback_fn(h->callback_data, err);
+ h->callback_fn = h->callback_data = NULL;
+ }
+ return;
+}
+
+/*
+ * submit_stpg - Issue a SET TARGET GROUP STATES command
+ *
+ * Currently we're only setting the current target port group state
+ * to 'active/optimized' and let the array firmware figure out
+ * the states of the remaining groups.
+ */
+static unsigned submit_stpg(struct alua_dh_data *h)
+{
+ struct request *rq;
+ int stpg_len = 8;
+ struct scsi_device *sdev = h->sdev;
+
+ /* Prepare the data buffer */
+ memset(h->buff, 0, stpg_len);
+ h->buff[4] = TPGS_STATE_OPTIMIZED & 0x0f;
+ h->buff[6] = (h->group_id >> 8) & 0xff;
+ h->buff[7] = h->group_id & 0xff;
+
+ rq = get_alua_req(sdev, h->buff, stpg_len, WRITE);
+ if (!rq)
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ /* Prepare the command. */
+ rq->cmd[0] = MAINTENANCE_OUT;
+ rq->cmd[1] = MO_SET_TARGET_PGS;
+ rq->cmd[6] = (stpg_len >> 24) & 0xff;
+ rq->cmd[7] = (stpg_len >> 16) & 0xff;
+ rq->cmd[8] = (stpg_len >> 8) & 0xff;
+ rq->cmd[9] = stpg_len & 0xff;
+ rq->cmd_len = COMMAND_SIZE(MAINTENANCE_OUT);
+
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = h->senselen = 0;
+ rq->end_io_data = h;
+
+ blk_execute_rq_nowait(rq->q, NULL, rq, 1, stpg_endio);
+ return SCSI_DH_OK;
+}
+
+/*
+ * alua_check_tpgs - Evaluate TPGS setting
+ * @sdev: device to be checked
+ *
+ * Examine the TPGS setting of the sdev to find out if ALUA
+ * is supported.
+ */
+static int alua_check_tpgs(struct scsi_device *sdev, struct alua_dh_data *h)
+{
+ int err = SCSI_DH_OK;
+
+ h->tpgs = scsi_device_tpgs(sdev);
+ switch (h->tpgs) {
+ case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT:
+ sdev_printk(KERN_INFO, sdev,
+ "%s: supports implicit and explicit TPGS\n",
+ ALUA_DH_NAME);
+ break;
+ case TPGS_MODE_EXPLICIT:
+ sdev_printk(KERN_INFO, sdev, "%s: supports explicit TPGS\n",
+ ALUA_DH_NAME);
+ break;
+ case TPGS_MODE_IMPLICIT:
+ sdev_printk(KERN_INFO, sdev, "%s: supports implicit TPGS\n",
+ ALUA_DH_NAME);
+ break;
+ default:
+ h->tpgs = TPGS_MODE_NONE;
+ sdev_printk(KERN_INFO, sdev, "%s: not supported\n",
+ ALUA_DH_NAME);
+ err = SCSI_DH_DEV_UNSUPP;
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * alua_vpd_inquiry - Evaluate INQUIRY vpd page 0x83
+ * @sdev: device to be checked
+ *
+ * Extract the relative target port and the target port group
+ * descriptor from the list of identificators.
+ */
+static int alua_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
+{
+ int len;
+ unsigned err;
+ unsigned char *d;
+
+ retry:
+ err = submit_vpd_inquiry(sdev, h);
+
+ if (err != SCSI_DH_OK)
+ return err;
+
+ /* Check if vpd page exceeds initial buffer */
+ len = (h->buff[2] << 8) + h->buff[3] + 4;
+ if (len > h->bufflen) {
+ /* Resubmit with the correct length */
+ if (realloc_buffer(h, len)) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: kmalloc buffer failed\n",
+ ALUA_DH_NAME);
+ /* Temporary failure, bypass */
+ return SCSI_DH_DEV_TEMP_BUSY;
+ }
+ goto retry;
+ }
+
+ /*
+ * Now look for the correct descriptor.
+ */
+ d = h->buff + 4;
+ while (d < h->buff + len) {
+ switch (d[1] & 0xf) {
+ case 0x4:
+ /* Relative target port */
+ h->rel_port = (d[6] << 8) + d[7];
+ break;
+ case 0x5:
+ /* Target port group */
+ h->group_id = (d[6] << 8) + d[7];
+ break;
+ default:
+ break;
+ }
+ d += d[3] + 4;
+ }
+
+ if (h->group_id == -1) {
+ /*
+ * Internal error; TPGS supported but required
+ * VPD identification descriptors not present.
+ * Disable ALUA support
+ */
+ sdev_printk(KERN_INFO, sdev,
+ "%s: No target port descriptors found\n",
+ ALUA_DH_NAME);
+ h->state = TPGS_STATE_OPTIMIZED;
+ h->tpgs = TPGS_MODE_NONE;
+ err = SCSI_DH_DEV_UNSUPP;
+ } else {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: port group %02x rel port %02x\n",
+ ALUA_DH_NAME, h->group_id, h->rel_port);
+ }
+
+ return err;
+}
+
+static char print_alua_state(int state)
+{
+ switch (state) {
+ case TPGS_STATE_OPTIMIZED:
+ return 'A';
+ case TPGS_STATE_NONOPTIMIZED:
+ return 'N';
+ case TPGS_STATE_STANDBY:
+ return 'S';
+ case TPGS_STATE_UNAVAILABLE:
+ return 'U';
+ case TPGS_STATE_LBA_DEPENDENT:
+ return 'L';
+ case TPGS_STATE_OFFLINE:
+ return 'O';
+ case TPGS_STATE_TRANSITIONING:
+ return 'T';
+ default:
+ return 'X';
+ }
+}
+
+static int alua_check_sense(struct scsi_device *sdev,
+ struct scsi_sense_hdr *sense_hdr)
+{
+ switch (sense_hdr->sense_key) {
+ case NOT_READY:
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0a)
+ /*
+ * LUN Not Accessible - ALUA state transition
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0b)
+ /*
+ * LUN Not Accessible -- Target port in standby state
+ */
+ return SUCCESS;
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x0c)
+ /*
+ * LUN Not Accessible -- Target port in unavailable state
+ */
+ return SUCCESS;
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x12)
+ /*
+ * LUN Not Ready -- Offline
+ */
+ return SUCCESS;
+ if (sdev->allow_restart &&
+ sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x02)
+ /*
+ * if the device is not started, we need to wake
+ * the error handler to start the motor
+ */
+ return FAILED;
+ break;
+ case UNIT_ATTENTION:
+ if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
+ /*
+ * Power On, Reset, or Bus Device Reset, just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x04)
+ /*
+ * Device internal reset
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x01)
+ /*
+ * Mode Parameters Changed
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x06)
+ /*
+ * ALUA state changed
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x07)
+ /*
+ * Implicit ALUA state transition failed
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x03)
+ /*
+ * Inquiry data has changed
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x0e)
+ /*
+ * REPORTED_LUNS_DATA_HAS_CHANGED is reported
+ * when switching controllers on targets like
+ * Intel Multi-Flex. We can just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ break;
+ }
+
+ return SCSI_RETURN_NOT_HANDLED;
+}
+
+/*
+ * alua_rtpg - Evaluate REPORT TARGET GROUP STATES
+ * @sdev: the device to be evaluated.
+ * @wait_for_transition: if nonzero, wait ALUA_FAILOVER_TIMEOUT seconds for device to exit transitioning state
+ *
+ * Evaluate the Target Port Group State.
+ * Returns SCSI_DH_DEV_OFFLINED if the path is
+ * found to be unusable.
+ */
+static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_for_transition)
+{
+ struct scsi_sense_hdr sense_hdr;
+ int len, k, off, valid_states = 0;
+ unsigned char *ucp;
+ unsigned err;
+ bool rtpg_ext_hdr_req = 1;
+ unsigned long expiry, interval = 0;
+ unsigned int tpg_desc_tbl_off;
+ unsigned char orig_transition_tmo;
+
+ if (!h->transition_tmo)
+ expiry = round_jiffies_up(jiffies + ALUA_FAILOVER_TIMEOUT * HZ);
+ else
+ expiry = round_jiffies_up(jiffies + h->transition_tmo * HZ);
+
+ retry:
+ err = submit_rtpg(sdev, h, rtpg_ext_hdr_req);
+
+ if (err == SCSI_DH_IO && h->senselen > 0) {
+ err = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
+ &sense_hdr);
+ if (!err)
+ return SCSI_DH_IO;
+
+ /*
+ * submit_rtpg() has failed on existing arrays
+ * when requesting extended header info, and
+ * the array doesn't support extended headers,
+ * even though it shouldn't according to T10.
+ * The retry without rtpg_ext_hdr_req set
+ * handles this.
+ */
+ if (rtpg_ext_hdr_req == 1 &&
+ sense_hdr.sense_key == ILLEGAL_REQUEST &&
+ sense_hdr.asc == 0x24 && sense_hdr.ascq == 0) {
+ rtpg_ext_hdr_req = 0;
+ goto retry;
+ }
+
+ err = alua_check_sense(sdev, &sense_hdr);
+ if (err == ADD_TO_MLQUEUE && time_before(jiffies, expiry))
+ goto retry;
+ sdev_printk(KERN_INFO, sdev,
+ "%s: rtpg sense code %02x/%02x/%02x\n",
+ ALUA_DH_NAME, sense_hdr.sense_key,
+ sense_hdr.asc, sense_hdr.ascq);
+ err = SCSI_DH_IO;
+ }
+ if (err != SCSI_DH_OK)
+ return err;
+
+ len = (h->buff[0] << 24) + (h->buff[1] << 16) +
+ (h->buff[2] << 8) + h->buff[3] + 4;
+
+ if (len > h->bufflen) {
+ /* Resubmit with the correct length */
+ if (realloc_buffer(h, len)) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: kmalloc buffer failed\n",__func__);
+ /* Temporary failure, bypass */
+ return SCSI_DH_DEV_TEMP_BUSY;
+ }
+ goto retry;
+ }
+
+ orig_transition_tmo = h->transition_tmo;
+ if ((h->buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR && h->buff[5] != 0)
+ h->transition_tmo = h->buff[5];
+ else
+ h->transition_tmo = ALUA_FAILOVER_TIMEOUT;
+
+ if (wait_for_transition && (orig_transition_tmo != h->transition_tmo)) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: transition timeout set to %d seconds\n",
+ ALUA_DH_NAME, h->transition_tmo);
+ expiry = jiffies + h->transition_tmo * HZ;
+ }
+
+ if ((h->buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR)
+ tpg_desc_tbl_off = 8;
+ else
+ tpg_desc_tbl_off = 4;
+
+ for (k = tpg_desc_tbl_off, ucp = h->buff + tpg_desc_tbl_off;
+ k < len;
+ k += off, ucp += off) {
+
+ if (h->group_id == (ucp[2] << 8) + ucp[3]) {
+ h->state = ucp[0] & 0x0f;
+ h->pref = ucp[0] >> 7;
+ valid_states = ucp[1];
+ }
+ off = 8 + (ucp[7] * 4);
+ }
+
+ sdev_printk(KERN_INFO, sdev,
+ "%s: port group %02x state %c %s supports %c%c%c%c%c%c%c\n",
+ ALUA_DH_NAME, h->group_id, print_alua_state(h->state),
+ h->pref ? "preferred" : "non-preferred",
+ valid_states&TPGS_SUPPORT_TRANSITION?'T':'t',
+ valid_states&TPGS_SUPPORT_OFFLINE?'O':'o',
+ valid_states&TPGS_SUPPORT_LBA_DEPENDENT?'L':'l',
+ valid_states&TPGS_SUPPORT_UNAVAILABLE?'U':'u',
+ valid_states&TPGS_SUPPORT_STANDBY?'S':'s',
+ valid_states&TPGS_SUPPORT_NONOPTIMIZED?'N':'n',
+ valid_states&TPGS_SUPPORT_OPTIMIZED?'A':'a');
+
+ switch (h->state) {
+ case TPGS_STATE_TRANSITIONING:
+ if (wait_for_transition) {
+ if (time_before(jiffies, expiry)) {
+ /* State transition, retry */
+ interval += 2000;
+ msleep(interval);
+ goto retry;
+ }
+ err = SCSI_DH_RETRY;
+ } else {
+ err = SCSI_DH_OK;
+ }
+
+ /* Transitioning time exceeded, set port to standby */
+ h->state = TPGS_STATE_STANDBY;
+ break;
+ case TPGS_STATE_OFFLINE:
+ /* Path unusable */
+ err = SCSI_DH_DEV_OFFLINED;
+ break;
+ default:
+ /* Useable path if active */
+ err = SCSI_DH_OK;
+ break;
+ }
+ return err;
+}
+
+/*
+ * alua_initialize - Initialize ALUA state
+ * @sdev: the device to be initialized
+ *
+ * For the prep_fn to work correctly we have
+ * to initialize the ALUA state for the device.
+ */
+static int alua_initialize(struct scsi_device *sdev, struct alua_dh_data *h)
+{
+ int err;
+
+ err = alua_check_tpgs(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto out;
+
+ err = alua_vpd_inquiry(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto out;
+
+ err = alua_rtpg(sdev, h, 0);
+ if (err != SCSI_DH_OK)
+ goto out;
+
+out:
+ return err;
+}
+/*
+ * alua_set_params - set/unset the optimize flag
+ * @sdev: device on the path to be activated
+ * params - parameters in the following format
+ * "no_of_params\0param1\0param2\0param3\0...\0"
+ * For example, to set the flag pass the following parameters
+ * from multipath.conf
+ * hardware_handler "2 alua 1"
+ */
+static int alua_set_params(struct scsi_device *sdev, const char *params)
+{
+ struct alua_dh_data *h = get_alua_data(sdev);
+ unsigned int optimize = 0, argc;
+ const char *p = params;
+ int result = SCSI_DH_OK;
+
+ if ((sscanf(params, "%u", &argc) != 1) || (argc != 1))
+ return -EINVAL;
+
+ while (*p++)
+ ;
+ if ((sscanf(p, "%u", &optimize) != 1) || (optimize > 1))
+ return -EINVAL;
+
+ if (optimize)
+ h->flags |= ALUA_OPTIMIZE_STPG;
+ else
+ h->flags &= ~ALUA_OPTIMIZE_STPG;
+
+ return result;
+}
+
+static uint optimize_stpg;
+module_param(optimize_stpg, uint, S_IRUGO|S_IWUSR);
+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.");
+
+/*
+ * alua_activate - activate a path
+ * @sdev: device on the path to be activated
+ *
+ * We're currently switching the port group to be activated only and
+ * let the array figure out the rest.
+ * There may be other arrays which require us to switch all port groups
+ * based on a certain policy. But until we actually encounter them it
+ * should be okay.
+ */
+static int alua_activate(struct scsi_device *sdev,
+ activate_complete fn, void *data)
+{
+ struct alua_dh_data *h = get_alua_data(sdev);
+ int err = SCSI_DH_OK;
+ int stpg = 0;
+
+ err = alua_rtpg(sdev, h, 1);
+ if (err != SCSI_DH_OK)
+ goto out;
+
+ if (optimize_stpg)
+ h->flags |= ALUA_OPTIMIZE_STPG;
+
+ if (h->tpgs & TPGS_MODE_EXPLICIT) {
+ switch (h->state) {
+ case TPGS_STATE_NONOPTIMIZED:
+ stpg = 1;
+ if ((h->flags & ALUA_OPTIMIZE_STPG) &&
+ (!h->pref) &&
+ (h->tpgs & TPGS_MODE_IMPLICIT))
+ stpg = 0;
+ break;
+ case TPGS_STATE_STANDBY:
+ case TPGS_STATE_UNAVAILABLE:
+ stpg = 1;
+ break;
+ case TPGS_STATE_OFFLINE:
+ err = SCSI_DH_IO;
+ break;
+ case TPGS_STATE_TRANSITIONING:
+ err = SCSI_DH_RETRY;
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (stpg) {
+ h->callback_fn = fn;
+ h->callback_data = data;
+ err = submit_stpg(h);
+ if (err == SCSI_DH_OK)
+ return 0;
+ h->callback_fn = h->callback_data = NULL;
+ }
+
+out:
+ if (fn)
+ fn(data, err);
+ return 0;
+}
+
+/*
+ * alua_prep_fn - request callback
+ *
+ * Fail I/O to all paths not in state
+ * active/optimized or active/non-optimized.
+ */
+static int alua_prep_fn(struct scsi_device *sdev, struct request *req)
+{
+ struct alua_dh_data *h = get_alua_data(sdev);
+ int ret = BLKPREP_OK;
+
+ if (h->state == TPGS_STATE_TRANSITIONING)
+ ret = BLKPREP_DEFER;
+ else if (h->state != TPGS_STATE_OPTIMIZED &&
+ h->state != TPGS_STATE_NONOPTIMIZED &&
+ h->state != TPGS_STATE_LBA_DEPENDENT) {
+ ret = BLKPREP_KILL;
+ req->cmd_flags |= REQ_QUIET;
+ }
+ return ret;
+
+}
+
+static bool alua_match(struct scsi_device *sdev)
+{
+ return (scsi_device_tpgs(sdev) != 0);
+}
+
+/*
+ * alua_bus_attach - Attach device handler
+ * @sdev: device to be attached to
+ */
+static struct scsi_dh_data *alua_bus_attach(struct scsi_device *sdev)
+{
+ struct alua_dh_data *h;
+ int err;
+
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h)
+ return ERR_PTR(-ENOMEM);
+ h->tpgs = TPGS_MODE_UNINITIALIZED;
+ h->state = TPGS_STATE_OPTIMIZED;
+ h->group_id = -1;
+ h->rel_port = -1;
+ h->buff = h->inq;
+ h->bufflen = ALUA_INQUIRY_SIZE;
+ h->sdev = sdev;
+
+ err = alua_initialize(sdev, h);
+ if (err != SCSI_DH_OK && err != SCSI_DH_DEV_OFFLINED)
+ goto failed;
+
+ sdev_printk(KERN_NOTICE, sdev, "%s: Attached\n", ALUA_DH_NAME);
+ return &h->dh_data;
+failed:
+ kfree(h);
+ return ERR_PTR(-EINVAL);
+}
+
+/*
+ * alua_bus_detach - Detach device handler
+ * @sdev: device to be detached from
+ */
+static void alua_bus_detach(struct scsi_device *sdev)
+{
+ struct alua_dh_data *h = get_alua_data(sdev);
+
+ if (h->buff && h->inq != h->buff)
+ kfree(h->buff);
+ kfree(h);
+}
+
+static struct scsi_device_handler alua_dh = {
+ .name = ALUA_DH_NAME,
+ .module = THIS_MODULE,
+ .attach = alua_bus_attach,
+ .detach = alua_bus_detach,
+ .prep_fn = alua_prep_fn,
+ .check_sense = alua_check_sense,
+ .activate = alua_activate,
+ .set_params = alua_set_params,
+ .match = alua_match,
+};
+
+static int __init alua_init(void)
+{
+ int r;
+
+ r = scsi_register_device_handler(&alua_dh);
+ if (r != 0)
+ printk(KERN_ERR "%s: Failed to register scsi device handler",
+ ALUA_DH_NAME);
+ return r;
+}
+
+static void __exit alua_exit(void)
+{
+ scsi_unregister_device_handler(&alua_dh);
+}
+
+module_init(alua_init);
+module_exit(alua_exit);
+
+MODULE_DESCRIPTION("DM Multipath ALUA support");
+MODULE_AUTHOR("Hannes Reinecke <hare@suse.de>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(ALUA_DH_VER);
diff --git a/kernel/drivers/scsi/device_handler/scsi_dh_emc.c b/kernel/drivers/scsi/device_handler/scsi_dh_emc.c
new file mode 100644
index 000000000..6ed1caadb
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -0,0 +1,725 @@
+/*
+ * Target driver for EMC CLARiiON AX/CX-series hardware.
+ * Based on code from Lars Marowsky-Bree <lmb@suse.de>
+ * and Ed Goggin <egoggin@emc.com>.
+ *
+ * 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 <linux/slab.h>
+#include <linux/module.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dh.h>
+#include <scsi/scsi_device.h>
+
+#define CLARIION_NAME "emc"
+
+#define CLARIION_TRESPASS_PAGE 0x22
+#define CLARIION_BUFFER_SIZE 0xFC
+#define CLARIION_TIMEOUT (60 * HZ)
+#define CLARIION_RETRIES 3
+#define CLARIION_UNBOUND_LU -1
+#define CLARIION_SP_A 0
+#define CLARIION_SP_B 1
+
+/* Flags */
+#define CLARIION_SHORT_TRESPASS 1
+#define CLARIION_HONOR_RESERVATIONS 2
+
+/* LUN states */
+#define CLARIION_LUN_UNINITIALIZED -1
+#define CLARIION_LUN_UNBOUND 0
+#define CLARIION_LUN_BOUND 1
+#define CLARIION_LUN_OWNED 2
+
+static unsigned char long_trespass[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ CLARIION_TRESPASS_PAGE, /* Page code */
+ 0x09, /* Page length - 2 */
+ 0x01, /* Trespass code */
+ 0xff, 0xff, /* Trespass target */
+ 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
+};
+
+static unsigned char short_trespass[] = {
+ 0, 0, 0, 0,
+ CLARIION_TRESPASS_PAGE, /* Page code */
+ 0x02, /* Page length - 2 */
+ 0x01, /* Trespass code */
+ 0xff, /* Trespass target */
+};
+
+static const char * lun_state[] =
+{
+ "not bound",
+ "bound",
+ "owned",
+};
+
+struct clariion_dh_data {
+ struct scsi_dh_data dh_data;
+ /*
+ * Flags:
+ * CLARIION_SHORT_TRESPASS
+ * Use short trespass command (FC-series) or the long version
+ * (default for AX/CX CLARiiON arrays).
+ *
+ * CLARIION_HONOR_RESERVATIONS
+ * Whether or not (default) to honor SCSI reservations when
+ * initiating a switch-over.
+ */
+ unsigned flags;
+ /*
+ * I/O buffer for both MODE_SELECT and INQUIRY commands.
+ */
+ unsigned char buffer[CLARIION_BUFFER_SIZE];
+ /*
+ * SCSI sense buffer for commands -- assumes serial issuance
+ * and completion sequence of all commands for same multipath.
+ */
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ unsigned int senselen;
+ /*
+ * LUN state
+ */
+ int lun_state;
+ /*
+ * SP Port number
+ */
+ int port;
+ /*
+ * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
+ * path's mapped LUN
+ */
+ int default_sp;
+ /*
+ * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
+ * path's mapped LUN
+ */
+ int current_sp;
+};
+
+static inline struct clariion_dh_data
+ *get_clariion_data(struct scsi_device *sdev)
+{
+ return container_of(sdev->scsi_dh_data, struct clariion_dh_data,
+ dh_data);
+}
+
+/*
+ * Parse MODE_SELECT cmd reply.
+ */
+static int trespass_endio(struct scsi_device *sdev, char *sense)
+{
+ int err = SCSI_DH_IO;
+ struct scsi_sense_hdr sshdr;
+
+ if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
+ sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
+ "0x%2x, 0x%2x while sending CLARiiON trespass "
+ "command.\n", CLARIION_NAME, sshdr.sense_key,
+ sshdr.asc, sshdr.ascq);
+
+ if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
+ (sshdr.ascq == 0x00)) {
+ /*
+ * Array based copy in progress -- do not send
+ * mode_select or copy will be aborted mid-stream.
+ */
+ sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
+ "progress while sending CLARiiON trespass "
+ "command.\n", CLARIION_NAME);
+ err = SCSI_DH_DEV_TEMP_BUSY;
+ } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
+ (sshdr.ascq == 0x03)) {
+ /*
+ * LUN Not Ready - Manual Intervention Required
+ * indicates in-progress ucode upgrade (NDU).
+ */
+ sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
+ "ucode upgrade NDU operation while sending "
+ "CLARiiON trespass command.\n", CLARIION_NAME);
+ err = SCSI_DH_DEV_TEMP_BUSY;
+ } else
+ err = SCSI_DH_DEV_FAILED;
+ } else {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: failed to send MODE SELECT, no sense available\n",
+ CLARIION_NAME);
+ }
+ return err;
+}
+
+static int parse_sp_info_reply(struct scsi_device *sdev,
+ struct clariion_dh_data *csdev)
+{
+ int err = SCSI_DH_OK;
+
+ /* check for in-progress ucode upgrade (NDU) */
+ if (csdev->buffer[48] != 0) {
+ sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
+ "ucode upgrade NDU operation while finding "
+ "current active SP.", CLARIION_NAME);
+ err = SCSI_DH_DEV_TEMP_BUSY;
+ goto out;
+ }
+ if (csdev->buffer[4] > 2) {
+ /* Invalid buffer format */
+ sdev_printk(KERN_NOTICE, sdev,
+ "%s: invalid VPD page 0xC0 format\n",
+ CLARIION_NAME);
+ err = SCSI_DH_NOSYS;
+ goto out;
+ }
+ switch (csdev->buffer[28] & 0x0f) {
+ case 6:
+ sdev_printk(KERN_NOTICE, sdev,
+ "%s: ALUA failover mode detected\n",
+ CLARIION_NAME);
+ break;
+ case 4:
+ /* Linux failover */
+ break;
+ default:
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: Invalid failover mode %d\n",
+ CLARIION_NAME, csdev->buffer[28] & 0x0f);
+ err = SCSI_DH_NOSYS;
+ goto out;
+ }
+
+ csdev->default_sp = csdev->buffer[5];
+ csdev->lun_state = csdev->buffer[4];
+ csdev->current_sp = csdev->buffer[8];
+ csdev->port = csdev->buffer[7];
+
+out:
+ return err;
+}
+
+#define emc_default_str "FC (Legacy)"
+
+static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
+{
+ unsigned char len = buffer[4] + 5;
+ char *sp_model = NULL;
+ unsigned char sp_len, serial_len;
+
+ if (len < 160) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: Invalid information section length %d\n",
+ CLARIION_NAME, len);
+ /* Check for old FC arrays */
+ if (!strncmp(buffer + 8, "DGC", 3)) {
+ /* Old FC array, not supporting extended information */
+ sp_model = emc_default_str;
+ }
+ goto out;
+ }
+
+ /*
+ * Parse extended information for SP model number
+ */
+ serial_len = buffer[160];
+ if (serial_len == 0 || serial_len + 161 > len) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: Invalid array serial number length %d\n",
+ CLARIION_NAME, serial_len);
+ goto out;
+ }
+ sp_len = buffer[99];
+ if (sp_len == 0 || serial_len + sp_len + 161 > len) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: Invalid model number length %d\n",
+ CLARIION_NAME, sp_len);
+ goto out;
+ }
+ sp_model = &buffer[serial_len + 161];
+ /* Strip whitespace at the end */
+ while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
+ sp_len--;
+
+ sp_model[sp_len] = '\0';
+
+out:
+ return sp_model;
+}
+
+/*
+ * Get block request for REQ_BLOCK_PC command issued to path. Currently
+ * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
+ *
+ * Uses data and sense buffers in hardware handler context structure and
+ * assumes serial servicing of commands, both issuance and completion.
+ */
+static struct request *get_req(struct scsi_device *sdev, int cmd,
+ unsigned char *buffer)
+{
+ struct request *rq;
+ int len = 0;
+
+ rq = blk_get_request(sdev->request_queue,
+ (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO);
+ if (IS_ERR(rq)) {
+ sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
+ return NULL;
+ }
+
+ blk_rq_set_block_pc(rq);
+ rq->cmd_len = COMMAND_SIZE(cmd);
+ rq->cmd[0] = cmd;
+
+ switch (cmd) {
+ case MODE_SELECT:
+ len = sizeof(short_trespass);
+ rq->cmd[1] = 0x10;
+ rq->cmd[4] = len;
+ break;
+ case MODE_SELECT_10:
+ len = sizeof(long_trespass);
+ rq->cmd[1] = 0x10;
+ rq->cmd[8] = len;
+ break;
+ case INQUIRY:
+ len = CLARIION_BUFFER_SIZE;
+ rq->cmd[4] = len;
+ memset(buffer, 0, len);
+ break;
+ default:
+ BUG_ON(1);
+ break;
+ }
+
+ rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
+ rq->timeout = CLARIION_TIMEOUT;
+ rq->retries = CLARIION_RETRIES;
+
+ if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
+ blk_put_request(rq);
+ return NULL;
+ }
+
+ return rq;
+}
+
+static int send_inquiry_cmd(struct scsi_device *sdev, int page,
+ struct clariion_dh_data *csdev)
+{
+ struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
+ int err;
+
+ if (!rq)
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ rq->sense = csdev->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = csdev->senselen = 0;
+
+ rq->cmd[0] = INQUIRY;
+ if (page != 0) {
+ rq->cmd[1] = 1;
+ rq->cmd[2] = page;
+ }
+ err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
+ if (err == -EIO) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: failed to send %s INQUIRY: %x\n",
+ CLARIION_NAME, page?"EVPD":"standard",
+ rq->errors);
+ csdev->senselen = rq->sense_len;
+ err = SCSI_DH_IO;
+ }
+
+ blk_put_request(rq);
+
+ return err;
+}
+
+static int send_trespass_cmd(struct scsi_device *sdev,
+ struct clariion_dh_data *csdev)
+{
+ struct request *rq;
+ unsigned char *page22;
+ int err, len, cmd;
+
+ if (csdev->flags & CLARIION_SHORT_TRESPASS) {
+ page22 = short_trespass;
+ if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
+ /* Set Honor Reservations bit */
+ page22[6] |= 0x80;
+ len = sizeof(short_trespass);
+ cmd = MODE_SELECT;
+ } else {
+ page22 = long_trespass;
+ if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
+ /* Set Honor Reservations bit */
+ page22[10] |= 0x80;
+ len = sizeof(long_trespass);
+ cmd = MODE_SELECT_10;
+ }
+ BUG_ON((len > CLARIION_BUFFER_SIZE));
+ memcpy(csdev->buffer, page22, len);
+
+ rq = get_req(sdev, cmd, csdev->buffer);
+ if (!rq)
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ rq->sense = csdev->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = csdev->senselen = 0;
+
+ err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
+ if (err == -EIO) {
+ if (rq->sense_len) {
+ err = trespass_endio(sdev, csdev->sense);
+ } else {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: failed to send MODE SELECT: %x\n",
+ CLARIION_NAME, rq->errors);
+ }
+ }
+
+ blk_put_request(rq);
+
+ return err;
+}
+
+static int clariion_check_sense(struct scsi_device *sdev,
+ struct scsi_sense_hdr *sense_hdr)
+{
+ switch (sense_hdr->sense_key) {
+ case NOT_READY:
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
+ /*
+ * LUN Not Ready - Manual Intervention Required
+ * indicates this is a passive path.
+ *
+ * FIXME: However, if this is seen and EVPD C0
+ * indicates that this is due to a NDU in
+ * progress, we should set FAIL_PATH too.
+ * This indicates we might have to do a SCSI
+ * inquiry in the end_io path. Ugh.
+ *
+ * Can return FAILED only when we want the error
+ * recovery process to kick in.
+ */
+ return SUCCESS;
+ break;
+ case ILLEGAL_REQUEST:
+ if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
+ /*
+ * An array based copy is in progress. Do not
+ * fail the path, do not bypass to another PG,
+ * do not retry. Fail the IO immediately.
+ * (Actually this is the same conclusion as in
+ * the default handler, but lets make sure.)
+ *
+ * Can return FAILED only when we want the error
+ * recovery process to kick in.
+ */
+ return SUCCESS;
+ break;
+ case UNIT_ATTENTION:
+ if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
+ /*
+ * Unit Attention Code. This is the first IO
+ * to the new path, so just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ break;
+ }
+
+ return SCSI_RETURN_NOT_HANDLED;
+}
+
+static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
+{
+ struct clariion_dh_data *h = get_clariion_data(sdev);
+ int ret = BLKPREP_OK;
+
+ if (h->lun_state != CLARIION_LUN_OWNED) {
+ ret = BLKPREP_KILL;
+ req->cmd_flags |= REQ_QUIET;
+ }
+ return ret;
+
+}
+
+static int clariion_std_inquiry(struct scsi_device *sdev,
+ struct clariion_dh_data *csdev)
+{
+ int err;
+ char *sp_model;
+
+ err = send_inquiry_cmd(sdev, 0, csdev);
+ if (err != SCSI_DH_OK && csdev->senselen) {
+ struct scsi_sense_hdr sshdr;
+
+ if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
+ &sshdr)) {
+ sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
+ "%02x/%02x/%02x\n", CLARIION_NAME,
+ sshdr.sense_key, sshdr.asc, sshdr.ascq);
+ }
+ err = SCSI_DH_IO;
+ goto out;
+ }
+
+ sp_model = parse_sp_model(sdev, csdev->buffer);
+ if (!sp_model) {
+ err = SCSI_DH_DEV_UNSUPP;
+ goto out;
+ }
+
+ /*
+ * FC Series arrays do not support long trespass
+ */
+ if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
+ csdev->flags |= CLARIION_SHORT_TRESPASS;
+
+ sdev_printk(KERN_INFO, sdev,
+ "%s: detected Clariion %s, flags %x\n",
+ CLARIION_NAME, sp_model, csdev->flags);
+out:
+ return err;
+}
+
+static int clariion_send_inquiry(struct scsi_device *sdev,
+ struct clariion_dh_data *csdev)
+{
+ int err, retry = CLARIION_RETRIES;
+
+retry:
+ err = send_inquiry_cmd(sdev, 0xC0, csdev);
+ if (err != SCSI_DH_OK && csdev->senselen) {
+ struct scsi_sense_hdr sshdr;
+
+ err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
+ &sshdr);
+ if (!err)
+ return SCSI_DH_IO;
+
+ err = clariion_check_sense(sdev, &sshdr);
+ if (retry > 0 && err == ADD_TO_MLQUEUE) {
+ retry--;
+ goto retry;
+ }
+ sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
+ "%02x/%02x/%02x\n", CLARIION_NAME,
+ sshdr.sense_key, sshdr.asc, sshdr.ascq);
+ err = SCSI_DH_IO;
+ } else {
+ err = parse_sp_info_reply(sdev, csdev);
+ }
+ return err;
+}
+
+static int clariion_activate(struct scsi_device *sdev,
+ activate_complete fn, void *data)
+{
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ int result;
+
+ result = clariion_send_inquiry(sdev, csdev);
+ if (result != SCSI_DH_OK)
+ goto done;
+
+ if (csdev->lun_state == CLARIION_LUN_OWNED)
+ goto done;
+
+ result = send_trespass_cmd(sdev, csdev);
+ if (result != SCSI_DH_OK)
+ goto done;
+ sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
+ CLARIION_NAME,
+ csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
+
+ /* Update status */
+ result = clariion_send_inquiry(sdev, csdev);
+ if (result != SCSI_DH_OK)
+ goto done;
+
+done:
+ sdev_printk(KERN_INFO, sdev,
+ "%s: at SP %c Port %d (%s, default SP %c)\n",
+ CLARIION_NAME, csdev->current_sp + 'A',
+ csdev->port, lun_state[csdev->lun_state],
+ csdev->default_sp + 'A');
+
+ if (fn)
+ fn(data, result);
+ return 0;
+}
+/*
+ * params - parameters in the following format
+ * "no_of_params\0param1\0param2\0param3\0...\0"
+ * for example, string for 2 parameters with value 10 and 21
+ * is specified as "2\010\021\0".
+ */
+static int clariion_set_params(struct scsi_device *sdev, const char *params)
+{
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ unsigned int hr = 0, st = 0, argc;
+ const char *p = params;
+ int result = SCSI_DH_OK;
+
+ if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
+ return -EINVAL;
+
+ while (*p++)
+ ;
+ if ((sscanf(p, "%u", &st) != 1) || (st > 1))
+ return -EINVAL;
+
+ while (*p++)
+ ;
+ if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
+ return -EINVAL;
+
+ if (st)
+ csdev->flags |= CLARIION_SHORT_TRESPASS;
+ else
+ csdev->flags &= ~CLARIION_SHORT_TRESPASS;
+
+ if (hr)
+ csdev->flags |= CLARIION_HONOR_RESERVATIONS;
+ else
+ csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
+
+ /*
+ * If this path is owned, we have to send a trespass command
+ * with the new parameters. If not, simply return. Next trespass
+ * command would use the parameters.
+ */
+ if (csdev->lun_state != CLARIION_LUN_OWNED)
+ goto done;
+
+ csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
+ result = send_trespass_cmd(sdev, csdev);
+ if (result != SCSI_DH_OK)
+ goto done;
+
+ /* Update status */
+ result = clariion_send_inquiry(sdev, csdev);
+
+done:
+ return result;
+}
+
+static const struct {
+ char *vendor;
+ char *model;
+} clariion_dev_list[] = {
+ {"DGC", "RAID"},
+ {"DGC", "DISK"},
+ {"DGC", "VRAID"},
+ {NULL, NULL},
+};
+
+static bool clariion_match(struct scsi_device *sdev)
+{
+ int i;
+
+ if (scsi_device_tpgs(sdev))
+ return false;
+
+ for (i = 0; clariion_dev_list[i].vendor; i++) {
+ if (!strncmp(sdev->vendor, clariion_dev_list[i].vendor,
+ strlen(clariion_dev_list[i].vendor)) &&
+ !strncmp(sdev->model, clariion_dev_list[i].model,
+ strlen(clariion_dev_list[i].model))) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static struct scsi_dh_data *clariion_bus_attach(struct scsi_device *sdev)
+{
+ struct clariion_dh_data *h;
+ int err;
+
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h)
+ return ERR_PTR(-ENOMEM);
+ h->lun_state = CLARIION_LUN_UNINITIALIZED;
+ h->default_sp = CLARIION_UNBOUND_LU;
+ h->current_sp = CLARIION_UNBOUND_LU;
+
+ err = clariion_std_inquiry(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto failed;
+
+ err = clariion_send_inquiry(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto failed;
+
+ sdev_printk(KERN_INFO, sdev,
+ "%s: connected to SP %c Port %d (%s, default SP %c)\n",
+ CLARIION_NAME, h->current_sp + 'A',
+ h->port, lun_state[h->lun_state],
+ h->default_sp + 'A');
+ return &h->dh_data;
+
+failed:
+ kfree(h);
+ return ERR_PTR(-EINVAL);
+}
+
+static void clariion_bus_detach(struct scsi_device *sdev)
+{
+ struct clariion_dh_data *h = get_clariion_data(sdev);
+
+ kfree(h);
+}
+
+static struct scsi_device_handler clariion_dh = {
+ .name = CLARIION_NAME,
+ .module = THIS_MODULE,
+ .attach = clariion_bus_attach,
+ .detach = clariion_bus_detach,
+ .check_sense = clariion_check_sense,
+ .activate = clariion_activate,
+ .prep_fn = clariion_prep_fn,
+ .set_params = clariion_set_params,
+ .match = clariion_match,
+};
+
+static int __init clariion_init(void)
+{
+ int r;
+
+ r = scsi_register_device_handler(&clariion_dh);
+ if (r != 0)
+ printk(KERN_ERR "%s: Failed to register scsi device handler.",
+ CLARIION_NAME);
+ return r;
+}
+
+static void __exit clariion_exit(void)
+{
+ scsi_unregister_device_handler(&clariion_dh);
+}
+
+module_init(clariion_init);
+module_exit(clariion_exit);
+
+MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/kernel/drivers/scsi/device_handler/scsi_dh_hp_sw.c
new file mode 100644
index 000000000..485d99544
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -0,0 +1,400 @@
+/*
+ * 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
+ * Copyright (C) 2008 Hannes Reinecke <hare@suse.de>
+ *
+ * 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 <linux/slab.h>
+#include <linux/module.h>
+#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
+
+#define HP_SW_PATH_UNINITIALIZED -1
+#define HP_SW_PATH_ACTIVE 0
+#define HP_SW_PATH_PASSIVE 1
+
+struct hp_sw_dh_data {
+ struct scsi_dh_data dh_data;
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ int path_state;
+ int retries;
+ int retry_cnt;
+ struct scsi_device *sdev;
+ activate_complete callback_fn;
+ void *callback_data;
+};
+
+static int hp_sw_start_stop(struct hp_sw_dh_data *);
+
+static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
+{
+ return container_of(sdev->scsi_dh_data, struct hp_sw_dh_data, dh_data);
+}
+
+/*
+ * tur_done - Handle TEST UNIT READY return status
+ * @sdev: sdev the command has been sent to
+ * @errors: blk error code
+ *
+ * Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path
+ */
+static int tur_done(struct scsi_device *sdev, unsigned char *sense)
+{
+ struct scsi_sense_hdr sshdr;
+ int ret;
+
+ ret = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
+ if (!ret) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending tur failed, no sense available\n",
+ HP_SW_NAME);
+ ret = SCSI_DH_IO;
+ goto done;
+ }
+ switch (sshdr.sense_key) {
+ case UNIT_ATTENTION:
+ ret = SCSI_DH_IMM_RETRY;
+ break;
+ case NOT_READY:
+ if ((sshdr.asc == 0x04) && (sshdr.ascq == 2)) {
+ /*
+ * LUN not ready - Initialization command required
+ *
+ * This is the passive path
+ */
+ ret = SCSI_DH_DEV_OFFLINED;
+ break;
+ }
+ /* Fallthrough */
+ default:
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending tur failed, sense %x/%x/%x\n",
+ HP_SW_NAME, sshdr.sense_key, sshdr.asc,
+ sshdr.ascq);
+ break;
+ }
+
+done:
+ return ret;
+}
+
+/*
+ * hp_sw_tur - Send TEST UNIT READY
+ * @sdev: sdev command should be sent to
+ *
+ * Use the TEST UNIT READY command to determine
+ * the path state.
+ */
+static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
+{
+ struct request *req;
+ int ret;
+
+retry:
+ req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO);
+ if (IS_ERR(req))
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ blk_rq_set_block_pc(req);
+ req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
+ req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY);
+ req->cmd[0] = TEST_UNIT_READY;
+ 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 == -EIO) {
+ if (req->sense_len > 0) {
+ ret = tur_done(sdev, h->sense);
+ } else {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending tur failed with %x\n",
+ HP_SW_NAME, req->errors);
+ ret = SCSI_DH_IO;
+ }
+ } else {
+ h->path_state = HP_SW_PATH_ACTIVE;
+ ret = SCSI_DH_OK;
+ }
+ if (ret == SCSI_DH_IMM_RETRY) {
+ blk_put_request(req);
+ goto retry;
+ }
+ if (ret == SCSI_DH_DEV_OFFLINED) {
+ h->path_state = HP_SW_PATH_PASSIVE;
+ ret = SCSI_DH_OK;
+ }
+
+ blk_put_request(req);
+
+ return ret;
+}
+
+/*
+ * start_done - Handle START STOP UNIT return status
+ * @sdev: sdev the command has been sent to
+ * @errors: blk error code
+ */
+static int start_done(struct scsi_device *sdev, unsigned char *sense)
+{
+ struct scsi_sense_hdr sshdr;
+ int rc;
+
+ rc = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
+ if (!rc) {
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending start_stop_unit failed, "
+ "no sense available\n",
+ HP_SW_NAME);
+ return SCSI_DH_IO;
+ }
+ switch (sshdr.sense_key) {
+ case NOT_READY:
+ if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) {
+ /*
+ * LUN not ready - manual intervention required
+ *
+ * Switch-over in progress, retry.
+ */
+ rc = SCSI_DH_RETRY;
+ break;
+ }
+ /* fall through */
+ default:
+ sdev_printk(KERN_WARNING, sdev,
+ "%s: sending start_stop_unit failed, sense %x/%x/%x\n",
+ HP_SW_NAME, sshdr.sense_key, sshdr.asc,
+ sshdr.ascq);
+ rc = SCSI_DH_IO;
+ }
+
+ return rc;
+}
+
+static void start_stop_endio(struct request *req, int error)
+{
+ struct hp_sw_dh_data *h = req->end_io_data;
+ unsigned err = SCSI_DH_OK;
+
+ if (error || host_byte(req->errors) != DID_OK ||
+ msg_byte(req->errors) != COMMAND_COMPLETE) {
+ sdev_printk(KERN_WARNING, h->sdev,
+ "%s: sending start_stop_unit failed with %x\n",
+ HP_SW_NAME, req->errors);
+ err = SCSI_DH_IO;
+ goto done;
+ }
+
+ if (req->sense_len > 0) {
+ err = start_done(h->sdev, h->sense);
+ if (err == SCSI_DH_RETRY) {
+ err = SCSI_DH_IO;
+ if (--h->retry_cnt) {
+ blk_put_request(req);
+ err = hp_sw_start_stop(h);
+ if (err == SCSI_DH_OK)
+ return;
+ }
+ }
+ }
+done:
+ req->end_io_data = NULL;
+ __blk_put_request(req->q, req);
+ if (h->callback_fn) {
+ h->callback_fn(h->callback_data, err);
+ h->callback_fn = h->callback_data = NULL;
+ }
+ return;
+
+}
+
+/*
+ * hp_sw_start_stop - Send START STOP UNIT command
+ * @sdev: sdev command should be sent to
+ *
+ * Sending START STOP UNIT activates the SP.
+ */
+static int hp_sw_start_stop(struct hp_sw_dh_data *h)
+{
+ struct request *req;
+
+ req = blk_get_request(h->sdev->request_queue, WRITE, GFP_ATOMIC);
+ if (IS_ERR(req))
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ blk_rq_set_block_pc(req);
+ req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
+ req->cmd_len = COMMAND_SIZE(START_STOP);
+ 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;
+ req->end_io_data = h;
+
+ blk_execute_rq_nowait(req->q, NULL, req, 1, start_stop_endio);
+ return SCSI_DH_OK;
+}
+
+static int hp_sw_prep_fn(struct scsi_device *sdev, struct request *req)
+{
+ struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+ int ret = BLKPREP_OK;
+
+ if (h->path_state != HP_SW_PATH_ACTIVE) {
+ ret = BLKPREP_KILL;
+ req->cmd_flags |= REQ_QUIET;
+ }
+ return ret;
+
+}
+
+/*
+ * hp_sw_activate - Activate a path
+ * @sdev: sdev on the path to be activated
+ *
+ * The HP Active/Passive firmware is pretty simple;
+ * the passive path reports NOT READY with sense codes
+ * 0x04/0x02; a START STOP UNIT command will then
+ * activate the passive path (and deactivate the
+ * previously active one).
+ */
+static int hp_sw_activate(struct scsi_device *sdev,
+ activate_complete fn, void *data)
+{
+ int ret = SCSI_DH_OK;
+ struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+
+ ret = hp_sw_tur(sdev, h);
+
+ if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE) {
+ h->retry_cnt = h->retries;
+ h->callback_fn = fn;
+ h->callback_data = data;
+ ret = hp_sw_start_stop(h);
+ if (ret == SCSI_DH_OK)
+ return 0;
+ h->callback_fn = h->callback_data = NULL;
+ }
+
+ if (fn)
+ fn(data, ret);
+ return 0;
+}
+
+static const struct {
+ char *vendor;
+ char *model;
+} hp_sw_dh_data_list[] = {
+ {"COMPAQ", "MSA1000 VOLUME"},
+ {"COMPAQ", "HSV110"},
+ {"HP", "HSV100"},
+ {"DEC", "HSG80"},
+ {NULL, NULL},
+};
+
+static bool hp_sw_match(struct scsi_device *sdev)
+{
+ int i;
+
+ if (scsi_device_tpgs(sdev))
+ return false;
+
+ 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))) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static struct scsi_dh_data *hp_sw_bus_attach(struct scsi_device *sdev)
+{
+ struct hp_sw_dh_data *h;
+ int ret;
+
+ h = kzalloc(sizeof(*h), GFP_KERNEL);
+ if (!h)
+ return ERR_PTR(-ENOMEM);
+ h->path_state = HP_SW_PATH_UNINITIALIZED;
+ h->retries = HP_SW_RETRIES;
+ h->sdev = sdev;
+
+ ret = hp_sw_tur(sdev, h);
+ if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED)
+ goto failed;
+
+ sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
+ HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE?
+ "active":"passive");
+ return &h->dh_data;
+failed:
+ kfree(h);
+ return ERR_PTR(-EINVAL);
+}
+
+static void hp_sw_bus_detach( struct scsi_device *sdev )
+{
+ struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+
+ kfree(h);
+}
+
+static struct scsi_device_handler hp_sw_dh = {
+ .name = HP_SW_NAME,
+ .module = THIS_MODULE,
+ .attach = hp_sw_bus_attach,
+ .detach = hp_sw_bus_detach,
+ .activate = hp_sw_activate,
+ .prep_fn = hp_sw_prep_fn,
+ .match = hp_sw_match,
+};
+
+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 Active/Passive driver");
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/scsi/device_handler/scsi_dh_rdac.c b/kernel/drivers/scsi/device_handler/scsi_dh_rdac.c
new file mode 100644
index 000000000..b46ace3d4
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -0,0 +1,937 @@
+/*
+ * LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler
+ *
+ * Copyright (C) 2005 Mike Christie. All rights reserved.
+ * Copyright (C) Chandra Seetharaman, IBM Corp. 2007
+ *
+ * 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 of the License, 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; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+#include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dh.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#define RDAC_NAME "rdac"
+#define RDAC_RETRY_COUNT 5
+
+/*
+ * LSI mode page stuff
+ *
+ * These struct definitions and the forming of the
+ * mode page were taken from the LSI RDAC 2.4 GPL'd
+ * driver, and then converted to Linux conventions.
+ */
+#define RDAC_QUIESCENCE_TIME 20
+/*
+ * Page Codes
+ */
+#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
+
+/*
+ * Controller modes definitions
+ */
+#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
+
+/*
+ * RDAC Options field
+ */
+#define RDAC_FORCED_QUIESENCE 0x02
+
+#define RDAC_TIMEOUT (60 * HZ)
+#define RDAC_RETRIES 3
+
+struct rdac_mode_6_hdr {
+ u8 data_len;
+ u8 medium_type;
+ u8 device_params;
+ u8 block_desc_len;
+};
+
+struct rdac_mode_10_hdr {
+ u16 data_len;
+ u8 medium_type;
+ u8 device_params;
+ u16 reserved;
+ u16 block_desc_len;
+};
+
+struct rdac_mode_common {
+ u8 controller_serial[16];
+ u8 alt_controller_serial[16];
+ u8 rdac_mode[2];
+ u8 alt_rdac_mode[2];
+ u8 quiescence_timeout;
+ u8 rdac_options;
+};
+
+struct rdac_pg_legacy {
+ struct rdac_mode_6_hdr hdr;
+ u8 page_code;
+ u8 page_len;
+ struct rdac_mode_common common;
+#define MODE6_MAX_LUN 32
+ u8 lun_table[MODE6_MAX_LUN];
+ u8 reserved2[32];
+ u8 reserved3;
+ u8 reserved4;
+};
+
+struct rdac_pg_expanded {
+ struct rdac_mode_10_hdr hdr;
+ u8 page_code;
+ u8 subpage_code;
+ u8 page_len[2];
+ struct rdac_mode_common common;
+ u8 lun_table[256];
+ u8 reserved3;
+ u8 reserved4;
+};
+
+struct c9_inquiry {
+ u8 peripheral_info;
+ u8 page_code; /* 0xC9 */
+ u8 reserved1;
+ u8 page_len;
+ u8 page_id[4]; /* "vace" */
+ u8 avte_cvp;
+ u8 path_prio;
+ u8 reserved2[38];
+};
+
+#define SUBSYS_ID_LEN 16
+#define SLOT_ID_LEN 2
+#define ARRAY_LABEL_LEN 31
+
+struct c4_inquiry {
+ u8 peripheral_info;
+ u8 page_code; /* 0xC4 */
+ u8 reserved1;
+ u8 page_len;
+ u8 page_id[4]; /* "subs" */
+ u8 subsys_id[SUBSYS_ID_LEN];
+ u8 revision[4];
+ u8 slot_id[SLOT_ID_LEN];
+ u8 reserved[2];
+};
+
+#define UNIQUE_ID_LEN 16
+struct c8_inquiry {
+ u8 peripheral_info;
+ u8 page_code; /* 0xC8 */
+ u8 reserved1;
+ u8 page_len;
+ u8 page_id[4]; /* "edid" */
+ u8 reserved2[3];
+ u8 vol_uniq_id_len;
+ u8 vol_uniq_id[16];
+ u8 vol_user_label_len;
+ u8 vol_user_label[60];
+ u8 array_uniq_id_len;
+ u8 array_unique_id[UNIQUE_ID_LEN];
+ u8 array_user_label_len;
+ u8 array_user_label[60];
+ u8 lun[8];
+};
+
+struct rdac_controller {
+ u8 array_id[UNIQUE_ID_LEN];
+ int use_ms10;
+ struct kref kref;
+ struct list_head node; /* list of all controllers */
+ union {
+ struct rdac_pg_legacy legacy;
+ struct rdac_pg_expanded expanded;
+ } mode_select;
+ u8 index;
+ u8 array_name[ARRAY_LABEL_LEN];
+ struct Scsi_Host *host;
+ spinlock_t ms_lock;
+ int ms_queued;
+ struct work_struct ms_work;
+ struct scsi_device *ms_sdev;
+ struct list_head ms_head;
+};
+
+struct c2_inquiry {
+ u8 peripheral_info;
+ u8 page_code; /* 0xC2 */
+ u8 reserved1;
+ u8 page_len;
+ u8 page_id[4]; /* "swr4" */
+ u8 sw_version[3];
+ u8 sw_date[3];
+ u8 features_enabled;
+ u8 max_lun_supported;
+ u8 partitions[239]; /* Total allocation length should be 0xFF */
+};
+
+struct rdac_dh_data {
+ struct scsi_dh_data dh_data;
+ struct rdac_controller *ctlr;
+#define UNINITIALIZED_LUN (1 << 8)
+ unsigned lun;
+
+#define RDAC_MODE 0
+#define RDAC_MODE_AVT 1
+#define RDAC_MODE_IOSHIP 2
+ unsigned char mode;
+
+#define RDAC_STATE_ACTIVE 0
+#define RDAC_STATE_PASSIVE 1
+ unsigned char state;
+
+#define RDAC_LUN_UNOWNED 0
+#define RDAC_LUN_OWNED 1
+ char lun_state;
+
+#define RDAC_PREFERRED 0
+#define RDAC_NON_PREFERRED 1
+ char preferred;
+
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ union {
+ struct c2_inquiry c2;
+ struct c4_inquiry c4;
+ struct c8_inquiry c8;
+ struct c9_inquiry c9;
+ } inq;
+};
+
+static const char *mode[] = {
+ "RDAC",
+ "AVT",
+ "IOSHIP",
+};
+static const char *lun_state[] =
+{
+ "unowned",
+ "owned",
+};
+
+struct rdac_queue_data {
+ struct list_head entry;
+ struct rdac_dh_data *h;
+ activate_complete callback_fn;
+ void *callback_data;
+};
+
+static LIST_HEAD(ctlr_list);
+static DEFINE_SPINLOCK(list_lock);
+static struct workqueue_struct *kmpath_rdacd;
+static void send_mode_select(struct work_struct *work);
+
+/*
+ * module parameter to enable rdac debug logging.
+ * 2 bits for each type of logging, only two types defined for now
+ * Can be enhanced if required at later point
+ */
+static int rdac_logging = 1;
+module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
+ "Default is 1 - failover logging enabled, "
+ "set it to 0xF to enable all the logs");
+
+#define RDAC_LOG_FAILOVER 0
+#define RDAC_LOG_SENSE 2
+
+#define RDAC_LOG_BITS 2
+
+#define RDAC_LOG_LEVEL(SHIFT) \
+ ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
+
+#define RDAC_LOG(SHIFT, sdev, f, arg...) \
+do { \
+ if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
+ sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
+} while (0);
+
+static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
+{
+ return container_of(sdev->scsi_dh_data, struct rdac_dh_data, dh_data);
+}
+
+static struct request *get_rdac_req(struct scsi_device *sdev,
+ void *buffer, unsigned buflen, int rw)
+{
+ struct request *rq;
+ struct request_queue *q = sdev->request_queue;
+
+ rq = blk_get_request(q, rw, GFP_NOIO);
+
+ if (IS_ERR(rq)) {
+ sdev_printk(KERN_INFO, sdev,
+ "get_rdac_req: blk_get_request failed.\n");
+ return NULL;
+ }
+ blk_rq_set_block_pc(rq);
+
+ if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
+ blk_put_request(rq);
+ sdev_printk(KERN_INFO, sdev,
+ "get_rdac_req: blk_rq_map_kern failed.\n");
+ return NULL;
+ }
+
+ rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+ REQ_FAILFAST_DRIVER;
+ rq->retries = RDAC_RETRIES;
+ rq->timeout = RDAC_TIMEOUT;
+
+ return rq;
+}
+
+static struct request *rdac_failover_get(struct scsi_device *sdev,
+ struct rdac_dh_data *h, struct list_head *list)
+{
+ struct request *rq;
+ struct rdac_mode_common *common;
+ unsigned data_size;
+ struct rdac_queue_data *qdata;
+ u8 *lun_table;
+
+ if (h->ctlr->use_ms10) {
+ struct rdac_pg_expanded *rdac_pg;
+
+ data_size = sizeof(struct rdac_pg_expanded);
+ rdac_pg = &h->ctlr->mode_select.expanded;
+ memset(rdac_pg, 0, data_size);
+ common = &rdac_pg->common;
+ rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
+ rdac_pg->subpage_code = 0x1;
+ rdac_pg->page_len[0] = 0x01;
+ rdac_pg->page_len[1] = 0x28;
+ lun_table = rdac_pg->lun_table;
+ } else {
+ struct rdac_pg_legacy *rdac_pg;
+
+ data_size = sizeof(struct rdac_pg_legacy);
+ rdac_pg = &h->ctlr->mode_select.legacy;
+ memset(rdac_pg, 0, data_size);
+ common = &rdac_pg->common;
+ rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
+ rdac_pg->page_len = 0x68;
+ lun_table = rdac_pg->lun_table;
+ }
+ common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
+ common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
+ common->rdac_options = RDAC_FORCED_QUIESENCE;
+
+ list_for_each_entry(qdata, list, entry) {
+ lun_table[qdata->h->lun] = 0x81;
+ }
+
+ /* get request for block layer packet command */
+ rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
+ if (!rq)
+ return NULL;
+
+ /* Prepare the command. */
+ if (h->ctlr->use_ms10) {
+ rq->cmd[0] = MODE_SELECT_10;
+ rq->cmd[7] = data_size >> 8;
+ rq->cmd[8] = data_size & 0xff;
+ } else {
+ rq->cmd[0] = MODE_SELECT;
+ rq->cmd[4] = data_size;
+ }
+ rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
+
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = 0;
+
+ return rq;
+}
+
+static void release_controller(struct kref *kref)
+{
+ struct rdac_controller *ctlr;
+ ctlr = container_of(kref, struct rdac_controller, kref);
+
+ list_del(&ctlr->node);
+ kfree(ctlr);
+}
+
+static struct rdac_controller *get_controller(int index, char *array_name,
+ u8 *array_id, struct scsi_device *sdev)
+{
+ struct rdac_controller *ctlr, *tmp;
+
+ list_for_each_entry(tmp, &ctlr_list, node) {
+ if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
+ (tmp->index == index) &&
+ (tmp->host == sdev->host)) {
+ kref_get(&tmp->kref);
+ return tmp;
+ }
+ }
+ ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
+ if (!ctlr)
+ return NULL;
+
+ /* initialize fields of controller */
+ memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
+ ctlr->index = index;
+ ctlr->host = sdev->host;
+ memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
+
+ kref_init(&ctlr->kref);
+ ctlr->use_ms10 = -1;
+ ctlr->ms_queued = 0;
+ ctlr->ms_sdev = NULL;
+ spin_lock_init(&ctlr->ms_lock);
+ INIT_WORK(&ctlr->ms_work, send_mode_select);
+ INIT_LIST_HEAD(&ctlr->ms_head);
+ list_add(&ctlr->node, &ctlr_list);
+
+ return ctlr;
+}
+
+static int submit_inquiry(struct scsi_device *sdev, int page_code,
+ unsigned int len, struct rdac_dh_data *h)
+{
+ struct request *rq;
+ struct request_queue *q = sdev->request_queue;
+ int err = SCSI_DH_RES_TEMP_UNAVAIL;
+
+ rq = get_rdac_req(sdev, &h->inq, len, READ);
+ if (!rq)
+ goto done;
+
+ /* Prepare the command. */
+ rq->cmd[0] = INQUIRY;
+ rq->cmd[1] = 1;
+ rq->cmd[2] = page_code;
+ rq->cmd[4] = len;
+ rq->cmd_len = COMMAND_SIZE(INQUIRY);
+
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = 0;
+
+ err = blk_execute_rq(q, NULL, rq, 1);
+ if (err == -EIO)
+ err = SCSI_DH_IO;
+
+ blk_put_request(rq);
+done:
+ return err;
+}
+
+static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
+ char *array_name, u8 *array_id)
+{
+ int err, i;
+ struct c8_inquiry *inqp;
+
+ err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
+ if (err == SCSI_DH_OK) {
+ inqp = &h->inq.c8;
+ if (inqp->page_code != 0xc8)
+ return SCSI_DH_NOSYS;
+ if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
+ inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
+ return SCSI_DH_NOSYS;
+ h->lun = inqp->lun[7]; /* Uses only the last byte */
+
+ for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
+ *(array_name+i) = inqp->array_user_label[(2*i)+1];
+
+ *(array_name+ARRAY_LABEL_LEN-1) = '\0';
+ memset(array_id, 0, UNIQUE_ID_LEN);
+ memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
+ }
+ return err;
+}
+
+static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
+{
+ int err;
+ struct c9_inquiry *inqp;
+
+ h->state = RDAC_STATE_ACTIVE;
+ err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
+ if (err == SCSI_DH_OK) {
+ inqp = &h->inq.c9;
+ /* detect the operating mode */
+ if ((inqp->avte_cvp >> 5) & 0x1)
+ h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
+ else if (inqp->avte_cvp >> 7)
+ h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
+ else
+ h->mode = RDAC_MODE; /* LUN in RDAC mode */
+
+ /* Update ownership */
+ if (inqp->avte_cvp & 0x1)
+ h->lun_state = RDAC_LUN_OWNED;
+ else {
+ h->lun_state = RDAC_LUN_UNOWNED;
+ if (h->mode == RDAC_MODE)
+ h->state = RDAC_STATE_PASSIVE;
+ }
+
+ /* Update path prio*/
+ if (inqp->path_prio & 0x1)
+ h->preferred = RDAC_PREFERRED;
+ else
+ h->preferred = RDAC_NON_PREFERRED;
+ }
+
+ return err;
+}
+
+static int initialize_controller(struct scsi_device *sdev,
+ struct rdac_dh_data *h, char *array_name, u8 *array_id)
+{
+ int err, index;
+ struct c4_inquiry *inqp;
+
+ err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
+ if (err == SCSI_DH_OK) {
+ inqp = &h->inq.c4;
+ /* get the controller index */
+ if (inqp->slot_id[1] == 0x31)
+ index = 0;
+ else
+ index = 1;
+
+ spin_lock(&list_lock);
+ h->ctlr = get_controller(index, array_name, array_id, sdev);
+ if (!h->ctlr)
+ err = SCSI_DH_RES_TEMP_UNAVAIL;
+ spin_unlock(&list_lock);
+ }
+ return err;
+}
+
+static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
+{
+ int err;
+ struct c2_inquiry *inqp;
+
+ err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
+ if (err == SCSI_DH_OK) {
+ inqp = &h->inq.c2;
+ /*
+ * If more than MODE6_MAX_LUN luns are supported, use
+ * mode select 10
+ */
+ if (inqp->max_lun_supported >= MODE6_MAX_LUN)
+ h->ctlr->use_ms10 = 1;
+ else
+ h->ctlr->use_ms10 = 0;
+ }
+ return err;
+}
+
+static int mode_select_handle_sense(struct scsi_device *sdev,
+ unsigned char *sensebuf)
+{
+ struct scsi_sense_hdr sense_hdr;
+ int err = SCSI_DH_IO, ret;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
+ if (!ret)
+ goto done;
+
+ switch (sense_hdr.sense_key) {
+ case NO_SENSE:
+ case ABORTED_COMMAND:
+ case UNIT_ATTENTION:
+ err = SCSI_DH_RETRY;
+ break;
+ case NOT_READY:
+ if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
+ /* LUN Not Ready and is in the Process of Becoming
+ * Ready
+ */
+ err = SCSI_DH_RETRY;
+ break;
+ case ILLEGAL_REQUEST:
+ if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
+ /*
+ * Command Lock contention
+ */
+ err = SCSI_DH_RETRY;
+ break;
+ default:
+ break;
+ }
+
+ RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+ "MODE_SELECT returned with sense %02x/%02x/%02x",
+ (char *) h->ctlr->array_name, h->ctlr->index,
+ sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq);
+
+done:
+ return err;
+}
+
+static void send_mode_select(struct work_struct *work)
+{
+ struct rdac_controller *ctlr =
+ container_of(work, struct rdac_controller, ms_work);
+ struct request *rq;
+ struct scsi_device *sdev = ctlr->ms_sdev;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct request_queue *q = sdev->request_queue;
+ int err, retry_cnt = RDAC_RETRY_COUNT;
+ struct rdac_queue_data *tmp, *qdata;
+ LIST_HEAD(list);
+
+ spin_lock(&ctlr->ms_lock);
+ list_splice_init(&ctlr->ms_head, &list);
+ ctlr->ms_queued = 0;
+ ctlr->ms_sdev = NULL;
+ spin_unlock(&ctlr->ms_lock);
+
+retry:
+ err = SCSI_DH_RES_TEMP_UNAVAIL;
+ rq = rdac_failover_get(sdev, h, &list);
+ if (!rq)
+ goto done;
+
+ RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+ "%s MODE_SELECT command",
+ (char *) h->ctlr->array_name, h->ctlr->index,
+ (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
+
+ err = blk_execute_rq(q, NULL, rq, 1);
+ blk_put_request(rq);
+ if (err != SCSI_DH_OK) {
+ err = mode_select_handle_sense(sdev, h->sense);
+ if (err == SCSI_DH_RETRY && retry_cnt--)
+ goto retry;
+ }
+ if (err == SCSI_DH_OK) {
+ h->state = RDAC_STATE_ACTIVE;
+ RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
+ "MODE_SELECT completed",
+ (char *) h->ctlr->array_name, h->ctlr->index);
+ }
+
+done:
+ list_for_each_entry_safe(qdata, tmp, &list, entry) {
+ list_del(&qdata->entry);
+ if (err == SCSI_DH_OK)
+ qdata->h->state = RDAC_STATE_ACTIVE;
+ if (qdata->callback_fn)
+ qdata->callback_fn(qdata->callback_data, err);
+ kfree(qdata);
+ }
+ return;
+}
+
+static int queue_mode_select(struct scsi_device *sdev,
+ activate_complete fn, void *data)
+{
+ struct rdac_queue_data *qdata;
+ struct rdac_controller *ctlr;
+
+ qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
+ if (!qdata)
+ return SCSI_DH_RETRY;
+
+ qdata->h = get_rdac_data(sdev);
+ qdata->callback_fn = fn;
+ qdata->callback_data = data;
+
+ ctlr = qdata->h->ctlr;
+ spin_lock(&ctlr->ms_lock);
+ list_add_tail(&qdata->entry, &ctlr->ms_head);
+ if (!ctlr->ms_queued) {
+ ctlr->ms_queued = 1;
+ ctlr->ms_sdev = sdev;
+ queue_work(kmpath_rdacd, &ctlr->ms_work);
+ }
+ spin_unlock(&ctlr->ms_lock);
+ return SCSI_DH_OK;
+}
+
+static int rdac_activate(struct scsi_device *sdev,
+ activate_complete fn, void *data)
+{
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ int err = SCSI_DH_OK;
+ int act = 0;
+
+ err = check_ownership(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto done;
+
+ switch (h->mode) {
+ case RDAC_MODE:
+ if (h->lun_state == RDAC_LUN_UNOWNED)
+ act = 1;
+ break;
+ case RDAC_MODE_IOSHIP:
+ if ((h->lun_state == RDAC_LUN_UNOWNED) &&
+ (h->preferred == RDAC_PREFERRED))
+ act = 1;
+ break;
+ default:
+ break;
+ }
+
+ if (act) {
+ err = queue_mode_select(sdev, fn, data);
+ if (err == SCSI_DH_OK)
+ return 0;
+ }
+done:
+ if (fn)
+ fn(data, err);
+ return 0;
+}
+
+static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
+{
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ int ret = BLKPREP_OK;
+
+ if (h->state != RDAC_STATE_ACTIVE) {
+ ret = BLKPREP_KILL;
+ req->cmd_flags |= REQ_QUIET;
+ }
+ return ret;
+
+}
+
+static int rdac_check_sense(struct scsi_device *sdev,
+ struct scsi_sense_hdr *sense_hdr)
+{
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
+ "I/O returned with sense %02x/%02x/%02x",
+ (char *) h->ctlr->array_name, h->ctlr->index,
+ sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
+
+ switch (sense_hdr->sense_key) {
+ case NOT_READY:
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
+ /* LUN Not Ready - Logical Unit Not Ready and is in
+ * the process of becoming ready
+ * Just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
+ /* LUN Not Ready - Storage firmware incompatible
+ * Manual code synchonisation required.
+ *
+ * Nothing we can do here. Try to bypass the path.
+ */
+ return SUCCESS;
+ if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
+ /* LUN Not Ready - Quiescense in progress
+ *
+ * Just retry and wait.
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
+ /* LUN Not Ready - Quiescense in progress
+ * or has been achieved
+ * Just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ break;
+ case ILLEGAL_REQUEST:
+ if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
+ /* Invalid Request - Current Logical Unit Ownership.
+ * Controller is not the current owner of the LUN,
+ * Fail the path, so that the other path be used.
+ */
+ h->state = RDAC_STATE_PASSIVE;
+ return SUCCESS;
+ }
+ break;
+ case UNIT_ATTENTION:
+ if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
+ /*
+ * Power On, Reset, or Bus Device Reset, just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
+ /*
+ * Quiescence in progress , just retry.
+ */
+ return ADD_TO_MLQUEUE;
+ break;
+ }
+ /* success just means we do not care what scsi-ml does */
+ return SCSI_RETURN_NOT_HANDLED;
+}
+
+static const struct {
+ char *vendor;
+ char *model;
+} rdac_dev_list[] = {
+ {"IBM", "1722"},
+ {"IBM", "1724"},
+ {"IBM", "1726"},
+ {"IBM", "1742"},
+ {"IBM", "1745"},
+ {"IBM", "1746"},
+ {"IBM", "1813"},
+ {"IBM", "1814"},
+ {"IBM", "1815"},
+ {"IBM", "1818"},
+ {"IBM", "3526"},
+ {"SGI", "TP9"},
+ {"SGI", "IS"},
+ {"STK", "OPENstorage D280"},
+ {"STK", "FLEXLINE 380"},
+ {"SUN", "CSM"},
+ {"SUN", "LCSM100"},
+ {"SUN", "STK6580_6780"},
+ {"SUN", "SUN_6180"},
+ {"SUN", "ArrayStorage"},
+ {"DELL", "MD3"},
+ {"NETAPP", "INF-01-00"},
+ {"LSI", "INF-01-00"},
+ {"ENGENIO", "INF-01-00"},
+ {NULL, NULL},
+};
+
+static bool rdac_match(struct scsi_device *sdev)
+{
+ int i;
+
+ if (scsi_device_tpgs(sdev))
+ return false;
+
+ for (i = 0; rdac_dev_list[i].vendor; i++) {
+ if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
+ strlen(rdac_dev_list[i].vendor)) &&
+ !strncmp(sdev->model, rdac_dev_list[i].model,
+ strlen(rdac_dev_list[i].model))) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev)
+{
+ struct rdac_dh_data *h;
+ int err;
+ char array_name[ARRAY_LABEL_LEN];
+ char array_id[UNIQUE_ID_LEN];
+
+ h = kzalloc(sizeof(*h) , GFP_KERNEL);
+ if (!h)
+ return ERR_PTR(-ENOMEM);
+ h->lun = UNINITIALIZED_LUN;
+ h->state = RDAC_STATE_ACTIVE;
+
+ err = get_lun_info(sdev, h, array_name, array_id);
+ if (err != SCSI_DH_OK)
+ goto failed;
+
+ err = initialize_controller(sdev, h, array_name, array_id);
+ if (err != SCSI_DH_OK)
+ goto failed;
+
+ err = check_ownership(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto clean_ctlr;
+
+ err = set_mode_select(sdev, h);
+ if (err != SCSI_DH_OK)
+ goto clean_ctlr;
+
+ sdev_printk(KERN_NOTICE, sdev,
+ "%s: LUN %d (%s) (%s)\n",
+ RDAC_NAME, h->lun, mode[(int)h->mode],
+ lun_state[(int)h->lun_state]);
+
+ return &h->dh_data;
+
+clean_ctlr:
+ spin_lock(&list_lock);
+ kref_put(&h->ctlr->kref, release_controller);
+ spin_unlock(&list_lock);
+
+failed:
+ kfree(h);
+ return ERR_PTR(-EINVAL);
+}
+
+static void rdac_bus_detach( struct scsi_device *sdev )
+{
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ if (h->ctlr && h->ctlr->ms_queued)
+ flush_workqueue(kmpath_rdacd);
+
+ spin_lock(&list_lock);
+ if (h->ctlr)
+ kref_put(&h->ctlr->kref, release_controller);
+ spin_unlock(&list_lock);
+ kfree(h);
+}
+
+static struct scsi_device_handler rdac_dh = {
+ .name = RDAC_NAME,
+ .module = THIS_MODULE,
+ .prep_fn = rdac_prep_fn,
+ .check_sense = rdac_check_sense,
+ .attach = rdac_bus_attach,
+ .detach = rdac_bus_detach,
+ .activate = rdac_activate,
+ .match = rdac_match,
+};
+
+static int __init rdac_init(void)
+{
+ int r;
+
+ r = scsi_register_device_handler(&rdac_dh);
+ if (r != 0) {
+ printk(KERN_ERR "Failed to register scsi device handler.");
+ goto done;
+ }
+
+ /*
+ * Create workqueue to handle mode selects for rdac
+ */
+ kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
+ if (!kmpath_rdacd) {
+ scsi_unregister_device_handler(&rdac_dh);
+ printk(KERN_ERR "kmpath_rdacd creation failed.\n");
+
+ r = -EINVAL;
+ }
+done:
+ return r;
+}
+
+static void __exit rdac_exit(void)
+{
+ destroy_workqueue(kmpath_rdacd);
+ scsi_unregister_device_handler(&rdac_dh);
+}
+
+module_init(rdac_init);
+module_exit(rdac_exit);
+
+MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
+MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
+MODULE_VERSION("01.00.0000.0000");
+MODULE_LICENSE("GPL");