[SCSI] scsi_dh: add infrastructure for SCSI Device Handlers

Some of the storage devices (that can be accessed through multiple paths),
do need some special handling for
	1. Activating the passive path of the storage access.
	2. Decode and handle the special sense codes returned by the devices.
	3. Handle the I/Os being sent to the passive path, especially
           during the device probe time.
when accessed through multiple paths.

As of today this special device handling is done at the dm-multipath
layer using dm-handlers. That works well for (1); for (2) to be handled
at dm layer, scsi sense information need to be exported from SCSI to dm-layer,
which is not very attractive; (3) cannot be done at all at the dm layer.

Device handler has been moved to SCSI mainly to handle (2) and (3) properly.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

11 files changed, 283 insertions, 0 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 81ccbd7f9e34..7886ec6e5f87 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1771,4 +1771,6 @@ endif # SCSI_LOWLEVEL
 
 source "drivers/scsi/pcmcia/Kconfig"
 
+source "drivers/scsi/device_handler/Kconfig"
+
 endmenu
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 6c775e350c98..aa8272e188ea 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_SCSI_ISCSI_ATTRS)	+= scsi_transport_iscsi.o
 obj-$(CONFIG_SCSI_SAS_ATTRS)    += scsi_transport_sas.o
 obj-$(CONFIG_SCSI_SAS_LIBSAS)   += libsas/
 obj-$(CONFIG_SCSI_SRP_ATTRS)    += scsi_transport_srp.o
+obj-$(CONFIG_SCSI_DH)           += device_handler/
 
 obj-$(CONFIG_ISCSI_TCP)         += libiscsi.o   iscsi_tcp.o
 obj-$(CONFIG_INFINIBAND_ISER)   += libiscsi.o
diff --git a/drivers/scsi/device_handler/Kconfig b/drivers/scsi/device_handler/Kconfig
new file mode 100644
index 000000000000..228241d1d98c
--- /dev/null
+++ b/drivers/scsi/device_handler/Kconfig
@@ -0,0 +1,12 @@
+#
+# 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.
diff --git a/drivers/scsi/device_handler/Makefile b/drivers/scsi/device_handler/Makefile
new file mode 100644
index 000000000000..f306e44e3837
--- /dev/null
+++ b/drivers/scsi/device_handler/Makefile
@@ -0,0 +1,4 @@
+#
+# SCSI Device Handler
+#
+obj-$(CONFIG_SCSI_DH)           += scsi_dh.o
diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
new file mode 100644
index 000000000000..ab6c21cd9689
--- /dev/null
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -0,0 +1,162 @@
+/*
+ * 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 <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 (!strcmp(tmp->name, name)) {
+                        found = tmp;
+                        break;
+                }
+        }
+        spin_unlock(&list_lock);
+        return found;
+}
+
+static int scsi_dh_notifier_add(struct device *dev, void *data)
+{
+        struct scsi_device_handler *scsi_dh = data;
+
+        scsi_dh->nb.notifier_call(&scsi_dh->nb, BUS_NOTIFY_ADD_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)
+{
+        int ret = -EBUSY;
+        struct scsi_device_handler *tmp;
+
+        tmp = get_device_handler(scsi_dh->name);
+        if (tmp)
+                goto done;
+
+        ret = bus_register_notifier(&scsi_bus_type, &scsi_dh->nb);
+
+        bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh, scsi_dh_notifier_add);
+        spin_lock(&list_lock);
+        list_add(&scsi_dh->list, &scsi_dh_list);
+        spin_unlock(&list_lock);
+
+done:
+        return ret;
+}
+EXPORT_SYMBOL_GPL(scsi_register_device_handler);
+
+static int scsi_dh_notifier_remove(struct device *dev, void *data)
+{
+        struct scsi_device_handler *scsi_dh = data;
+
+        scsi_dh->nb.notifier_call(&scsi_dh->nb, BUS_NOTIFY_DEL_DEVICE, dev);
+        return 0;
+}
+
+/*
+ * 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)
+{
+        int ret = -ENODEV;
+        struct scsi_device_handler *tmp;
+
+        tmp = get_device_handler(scsi_dh->name);
+        if (!tmp)
+                goto done;
+
+        ret = bus_unregister_notifier(&scsi_bus_type, &scsi_dh->nb);
+
+        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);
+
+done:
+        return ret;
+}
+EXPORT_SYMBOL_GPL(scsi_unregister_device_handler);
+
+/*
+ * scsi_dh_activate - activate the path associated with the scsi_device
+ *      corresponding to the given request queue.
+ * @q - Request queue that is associated with the scsi_device to be
+ *      activated.
+ */
+int scsi_dh_activate(struct request_queue *q)
+{
+        int err = 0;
+        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 || !get_device(&sdev->sdev_gendev))
+                err = SCSI_DH_NOSYS;
+        spin_unlock_irqrestore(q->queue_lock, flags);
+
+        if (err)
+                return err;
+
+        if (scsi_dh->activate)
+                err = scsi_dh->activate(sdev);
+        put_device(&sdev->sdev_gendev);
+        return err;
+}
+EXPORT_SYMBOL_GPL(scsi_dh_activate);
+
+/*
+ * 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);
+
+MODULE_DESCRIPTION("SCSI device handler");
+MODULE_AUTHOR("Chandra Seetharaman <sekharan@us.ibm.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index eaf5a8add1ba..006a95916f72 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -298,6 +298,7 @@ static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
  */
 static int scsi_check_sense(struct scsi_cmnd *scmd)
 {
+        struct scsi_device *sdev = scmd->device;
         struct scsi_sense_hdr sshdr;
 
         if (! scsi_command_normalize_sense(scmd, &sshdr))
@@ -306,6 +307,16 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
         if (scsi_sense_is_deferred(&sshdr))
                 return NEEDS_RETRY;
 
+        if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh &&
+                        sdev->scsi_dh_data->scsi_dh->check_sense) {
+                int rc;
+
+                rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr);
+                if (rc != SCSI_RETURN_NOT_HANDLED)
+                        return rc;
+                /* handler does not care. Drop down to default handling */
+        }
+
         /*
          * Previous logic looked for FILEMARK, EOM or ILI which are
          * mainly associated with tapes and returned SUCCESS.
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index a82d2fe80fb5..033c58a65f50 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1160,6 +1160,14 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
 
         if (ret != BLKPREP_OK)
                 return ret;
+
+        if (unlikely(sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh
+                         && sdev->scsi_dh_data->scsi_dh->prep_fn)) {
+                ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
+                if (ret != BLKPREP_OK)
+                        return ret;
+        }
+
         /*
          * Filesystem requests must transfer data.
          */
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 93d2b6714453..b6e561059779 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -439,6 +439,7 @@ struct bus_type scsi_bus_type = {
         .resume         = scsi_bus_resume,
         .remove         = scsi_bus_remove,
 };
+EXPORT_SYMBOL_GPL(scsi_bus_type);
 
 int scsi_sysfs_register(void)
 {
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 32742c4563de..2b5b9356c314 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -400,6 +400,7 @@ struct scsi_lun {
 #define SOFT_ERROR      0x2005
 #define ADD_TO_MLQUEUE  0x2006
 #define TIMEOUT_ERROR   0x2007
+#define SCSI_RETURN_NOT_HANDLED   0x2008
 
 /*
  * Midlevel queue return values.
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f6a9fe0ef09c..06b979f105b7 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -161,9 +161,29 @@ struct scsi_device {
 
         struct execute_work     ew; /* used to get process context on put */
 
+        struct scsi_dh_data     *scsi_dh_data;
         enum scsi_device_state sdev_state;
         unsigned long           sdev_data[0];
 } __attribute__((aligned(sizeof(unsigned long))));
+
+struct scsi_device_handler {
+        /* Used by the infrastructure */
+        struct list_head list; /* list of scsi_device_handlers */
+        struct notifier_block nb;
+
+        /* Filled by the hardware handler */
+        struct module *module;
+        const char *name;
+        int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
+        int (*activate)(struct scsi_device *);
+        int (*prep_fn)(struct scsi_device *, struct request *);
+};
+
+struct scsi_dh_data {
+        struct scsi_device_handler *scsi_dh;
+        char buf[0];
+};
+
 #define to_scsi_device(d)       \
         container_of(d, struct scsi_device, sdev_gendev)
 #define class_to_sdev(d)        \
@@ -230,7 +250,9 @@ extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
                 uint, uint, uint, void *hostdata);
 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
                            uint target, uint lun);
+extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 extern void scsi_remove_device(struct scsi_device *);
+extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 
 extern int scsi_device_get(struct scsi_device *);
 extern void scsi_device_put(struct scsi_device *);
diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h
new file mode 100644
index 000000000000..04d0d8495c83
--- /dev/null
+++ b/include/scsi/scsi_dh.h
@@ -0,0 +1,59 @@
+/*
+ * Header file for SCSI device handler infrastruture.
+ *
+ * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
+ *
+ * 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 <scsi/scsi_device.h>
+
+enum {
+        SCSI_DH_OK = 0,
+        /*
+         * device errors
+         */
+        SCSI_DH_DEV_FAILED,     /* generic device error */
+        SCSI_DH_DEV_TEMP_BUSY,
+        SCSI_DH_DEVICE_MAX,     /* max device blkerr definition */
+
+        /*
+         * transport errors
+         */
+        SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
+        SCSI_DH_CONN_FAILURE,
+        SCSI_DH_TRANSPORT_MAX,  /* max transport blkerr definition */
+
+        /*
+         * driver and generic errors
+         */
+        SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */
+        SCSI_DH_INVALID_IO,
+        SCSI_DH_RETRY,          /* retry the req, but not immediately */
+        SCSI_DH_IMM_RETRY,      /* immediately retry the req */
+        SCSI_DH_TIMED_OUT,
+        SCSI_DH_RES_TEMP_UNAVAIL,
+        SCSI_DH_DEV_OFFLINED,
+        SCSI_DH_NOSYS,
+        SCSI_DH_DRIVER_MAX,
+};
+
+extern int scsi_dh_activate(struct request_queue *);
+extern int scsi_dh_handler_exist(const char *);