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-rw-r--r--drivers/scsi/device_handler/Kconfig32
-rw-r--r--drivers/scsi/device_handler/Makefile7
-rw-r--r--drivers/scsi/device_handler/scsi_dh.c162
-rw-r--r--drivers/scsi/device_handler/scsi_dh_emc.c499
-rw-r--r--drivers/scsi/device_handler/scsi_dh_hp_sw.c202
-rw-r--r--drivers/scsi/device_handler/scsi_dh_rdac.c691
6 files changed, 1593 insertions, 0 deletions
diff --git a/drivers/scsi/device_handler/Kconfig b/drivers/scsi/device_handler/Kconfig
new file mode 100644
index 00000000000..2adc0f666b6
--- /dev/null
+++ b/drivers/scsi/device_handler/Kconfig
@@ -0,0 +1,32 @@
+#
+# 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.
diff --git a/drivers/scsi/device_handler/Makefile b/drivers/scsi/device_handler/Makefile
new file mode 100644
index 00000000000..35272e93b1c
--- /dev/null
+++ b/drivers/scsi/device_handler/Makefile
@@ -0,0 +1,7 @@
+#
+# 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
diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
new file mode 100644
index 00000000000..ab6c21cd968
--- /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/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
new file mode 100644
index 00000000000..ed53f14007a
--- /dev/null
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -0,0 +1,499 @@
+/*
+ * 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 <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dh.h>
+#include <scsi/scsi_device.h>
+
+#define CLARIION_NAME "emc_clariion"
+
+#define CLARIION_TRESPASS_PAGE 0x22
+#define CLARIION_BUFFER_SIZE 0x80
+#define CLARIION_TIMEOUT (60 * HZ)
+#define CLARIION_RETRIES 3
+#define CLARIION_UNBOUND_LU -1
+
+static unsigned char long_trespass[] = {
+ 0, 0, 0, 0,
+ CLARIION_TRESPASS_PAGE, /* Page code */
+ 0x09, /* Page length - 2 */
+ 0x81, /* Trespass code + Honor reservation bit */
+ 0xff, 0xff, /* Trespass target */
+ 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
+};
+
+static unsigned char long_trespass_hr[] = {
+ 0, 0, 0, 0,
+ CLARIION_TRESPASS_PAGE, /* Page code */
+ 0x09, /* Page length - 2 */
+ 0x01, /* Trespass code + Honor reservation bit */
+ 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 */
+ 0x81, /* Trespass code + Honor reservation bit */
+ 0xff, /* Trespass target */
+};
+
+static unsigned char short_trespass_hr[] = {
+ 0, 0, 0, 0,
+ CLARIION_TRESPASS_PAGE, /* Page code */
+ 0x02, /* Page length - 2 */
+ 0x01, /* Trespass code + Honor reservation bit */
+ 0xff, /* Trespass target */
+};
+
+struct clariion_dh_data {
+ /*
+ * Use short trespass command (FC-series) or the long version
+ * (default for AX/CX CLARiiON arrays).
+ */
+ unsigned short_trespass;
+ /*
+ * Whether or not (default) to honor SCSI reservations when
+ * initiating a switch-over.
+ */
+ unsigned hr;
+ /* I/O buffer for both MODE_SELECT and INQUIRY commands. */
+ 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];
+ /* which SP (A=0,B=1,UNBOUND=-1) is dflt SP for path's mapped dev */
+ int default_sp;
+ /* which SP (A=0,B=1,UNBOUND=-1) is active for path's mapped dev */
+ int current_sp;
+};
+
+static inline struct clariion_dh_data
+ *get_clariion_data(struct scsi_device *sdev)
+{
+ struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
+ BUG_ON(scsi_dh_data == NULL);
+ return ((struct clariion_dh_data *) scsi_dh_data->buf);
+}
+
+/*
+ * Parse MODE_SELECT cmd reply.
+ */
+static int trespass_endio(struct scsi_device *sdev, int result)
+{
+ int err = SCSI_DH_OK;
+ struct scsi_sense_hdr sshdr;
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ char *sense = csdev->sense;
+
+ if (status_byte(result) == CHECK_CONDITION &&
+ scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
+ sdev_printk(KERN_ERR, sdev, "Found valid sense data 0x%2x, "
+ "0x%2x, 0x%2x while sending CLARiiON trespass "
+ "command.\n", 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, "Array Based Copy in "
+ "progress while sending CLARiiON trespass "
+ "command.\n");
+ 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, "Detected in-progress "
+ "ucode upgrade NDU operation while sending "
+ "CLARiiON trespass command.\n");
+ err = SCSI_DH_DEV_TEMP_BUSY;
+ } else
+ err = SCSI_DH_DEV_FAILED;
+ } else if (result) {
+ sdev_printk(KERN_ERR, sdev, "Error 0x%x while sending "
+ "CLARiiON trespass command.\n", result);
+ err = SCSI_DH_IO;
+ }
+
+ return err;
+}
+
+static int parse_sp_info_reply(struct scsi_device *sdev, int result,
+ int *default_sp, int *current_sp, int *new_current_sp)
+{
+ int err = SCSI_DH_OK;
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+
+ if (result == 0) {
+ /* check for in-progress ucode upgrade (NDU) */
+ if (csdev->buffer[48] != 0) {
+ sdev_printk(KERN_NOTICE, sdev, "Detected in-progress "
+ "ucode upgrade NDU operation while finding "
+ "current active SP.");
+ err = SCSI_DH_DEV_TEMP_BUSY;
+ } else {
+ *default_sp = csdev->buffer[5];
+
+ if (csdev->buffer[4] == 2)
+ /* SP for path is current */
+ *current_sp = csdev->buffer[8];
+ else {
+ if (csdev->buffer[4] == 1)
+ /* SP for this path is NOT current */
+ if (csdev->buffer[8] == 0)
+ *current_sp = 1;
+ else
+ *current_sp = 0;
+ else
+ /* unbound LU or LUNZ */
+ *current_sp = CLARIION_UNBOUND_LU;
+ }
+ *new_current_sp = csdev->buffer[8];
+ }
+ } else {
+ struct scsi_sense_hdr sshdr;
+
+ err = SCSI_DH_IO;
+
+ if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
+ &sshdr))
+ sdev_printk(KERN_ERR, sdev, "Found valid sense data "
+ "0x%2x, 0x%2x, 0x%2x while finding current "
+ "active SP.", sshdr.sense_key, sshdr.asc,
+ sshdr.ascq);
+ else
+ sdev_printk(KERN_ERR, sdev, "Error 0x%x finding "
+ "current active SP.", result);
+ }
+
+ return err;
+}
+
+static int sp_info_endio(struct scsi_device *sdev, int result,
+ int mode_select_sent, int *done)
+{
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ int err_flags, default_sp, current_sp, new_current_sp;
+
+ err_flags = parse_sp_info_reply(sdev, result, &default_sp,
+ &current_sp, &new_current_sp);
+
+ if (err_flags != SCSI_DH_OK)
+ goto done;
+
+ if (mode_select_sent) {
+ csdev->default_sp = default_sp;
+ csdev->current_sp = current_sp;
+ } else {
+ /*
+ * Issue the actual module_selec request IFF either
+ * (1) we do not know the identity of the current SP OR
+ * (2) what we think we know is actually correct.
+ */
+ if ((current_sp != CLARIION_UNBOUND_LU) &&
+ (new_current_sp != current_sp)) {
+
+ csdev->default_sp = default_sp;
+ csdev->current_sp = current_sp;
+
+ sdev_printk(KERN_INFO, sdev, "Ignoring path group "
+ "switch-over command for CLARiiON SP%s since "
+ " mapped device is already initialized.",
+ current_sp ? "B" : "A");
+ if (done)
+ *done = 1; /* as good as doing it */
+ }
+ }
+done:
+ return err_flags;
+}
+
+/*
+* 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)
+{
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ struct request *rq;
+ unsigned char *page22;
+ int len = 0;
+
+ rq = blk_get_request(sdev->request_queue,
+ (cmd == MODE_SELECT) ? WRITE : READ, GFP_ATOMIC);
+ if (!rq) {
+ sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
+ return NULL;
+ }
+
+ memset(&rq->cmd, 0, BLK_MAX_CDB);
+ rq->cmd[0] = cmd;
+ rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
+
+ switch (cmd) {
+ case MODE_SELECT:
+ if (csdev->short_trespass) {
+ page22 = csdev->hr ? short_trespass_hr : short_trespass;
+ len = sizeof(short_trespass);
+ } else {
+ page22 = csdev->hr ? long_trespass_hr : long_trespass;
+ len = sizeof(long_trespass);
+ }
+ /*
+ * Can't DMA from kernel BSS -- must copy selected trespass
+ * command mode page contents to context buffer which is
+ * allocated by kmalloc.
+ */
+ BUG_ON((len > CLARIION_BUFFER_SIZE));
+ memcpy(csdev->buffer, page22, len);
+ rq->cmd_flags |= REQ_RW;
+ rq->cmd[1] = 0x10;
+ break;
+ case INQUIRY:
+ rq->cmd[1] = 0x1;
+ rq->cmd[2] = 0xC0;
+ len = CLARIION_BUFFER_SIZE;
+ memset(csdev->buffer, 0, CLARIION_BUFFER_SIZE);
+ break;
+ default:
+ BUG_ON(1);
+ break;
+ }
+
+ rq->cmd[4] = len;
+ rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ rq->cmd_flags |= REQ_FAILFAST;
+ rq->timeout = CLARIION_TIMEOUT;
+ rq->retries = CLARIION_RETRIES;
+
+ rq->sense = csdev->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = 0;
+
+ if (blk_rq_map_kern(sdev->request_queue, rq, csdev->buffer,
+ len, GFP_ATOMIC)) {
+ __blk_put_request(rq->q, rq);
+ return NULL;
+ }
+
+ return rq;
+}
+
+static int send_cmd(struct scsi_device *sdev, int cmd)
+{
+ struct request *rq = get_req(sdev, cmd);
+
+ if (!rq)
+ return SCSI_DH_RES_TEMP_UNAVAIL;
+
+ return blk_execute_rq(sdev->request_queue, NULL, rq, 1);
+}
+
+static int clariion_activate(struct scsi_device *sdev)
+{
+ int result, done = 0;
+
+ result = send_cmd(sdev, INQUIRY);
+ result = sp_info_endio(sdev, result, 0, &done);
+ if (result || done)
+ goto done;
+
+ result = send_cmd(sdev, MODE_SELECT);
+ result = trespass_endio(sdev, result);
+ if (result)
+ goto done;
+
+ result = send_cmd(sdev, INQUIRY);
+ result = sp_info_endio(sdev, result, 1, NULL);
+done:
+ return result;
+}
+
+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 NEEDS_RETRY;
+ break;
+ }
+
+ /* success just means we do not care what scsi-ml does */
+ return SUCCESS;
+}
+
+static const struct {
+ char *vendor;
+ char *model;
+} clariion_dev_list[] = {
+ {"DGC", "RAID"},
+ {"DGC", "DISK"},
+ {NULL, NULL},
+};
+
+static int clariion_bus_notify(struct notifier_block *, unsigned long, void *);
+
+static struct scsi_device_handler clariion_dh = {
+ .name = CLARIION_NAME,
+ .module = THIS_MODULE,
+ .nb.notifier_call = clariion_bus_notify,
+ .check_sense = clariion_check_sense,
+ .activate = clariion_activate,
+};
+
+/*
+ * TODO: need some interface so we can set trespass values
+ */
+static int clariion_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_dh_data *scsi_dh_data;
+ struct clariion_dh_data *h;
+ int i, found = 0;
+ unsigned long flags;
+
+ if (action == BUS_NOTIFY_ADD_DEVICE) {
+ 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))) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ goto out;
+
+ scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ + sizeof(*h) , GFP_KERNEL);
+ if (!scsi_dh_data) {
+ sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
+ CLARIION_NAME);
+ goto out;
+ }
+
+ scsi_dh_data->scsi_dh = &clariion_dh;
+ h = (struct clariion_dh_data *) scsi_dh_data->buf;
+ h->default_sp = CLARIION_UNBOUND_LU;
+ h->current_sp = CLARIION_UNBOUND_LU;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ sdev->scsi_dh_data = scsi_dh_data;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", CLARIION_NAME);
+ try_module_get(THIS_MODULE);
+
+ } else if (action == BUS_NOTIFY_DEL_DEVICE) {
+ if (sdev->scsi_dh_data == NULL ||
+ sdev->scsi_dh_data->scsi_dh != &clariion_dh)
+ goto out;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ scsi_dh_data = sdev->scsi_dh_data;
+ sdev->scsi_dh_data = NULL;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n",
+ CLARIION_NAME);
+
+ kfree(scsi_dh_data);
+ module_put(THIS_MODULE);
+ }
+
+out:
+ return 0;
+}
+
+static int __init clariion_init(void)
+{
+ int r;
+
+ r = scsi_register_device_handler(&clariion_dh);
+ if (r != 0)
+ printk(KERN_ERR "Failed to register scsi device handler.");
+ 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/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
new file mode 100644
index 00000000000..12ceab7b366
--- /dev/null
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -0,0 +1,202 @@
+/*
+ * Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be
+ * upgraded.
+ *
+ * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2006 Mike Christie
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_dh.h>
+
+#define HP_SW_NAME "hp_sw"
+
+#define HP_SW_TIMEOUT (60 * HZ)
+#define HP_SW_RETRIES 3
+
+struct hp_sw_dh_data {
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ int retries;
+};
+
+static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
+{
+ struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
+ BUG_ON(scsi_dh_data == NULL);
+ return ((struct hp_sw_dh_data *) scsi_dh_data->buf);
+}
+
+static int hp_sw_done(struct scsi_device *sdev)
+{
+ struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+ struct scsi_sense_hdr sshdr;
+ int rc;
+
+ sdev_printk(KERN_INFO, sdev, "hp_sw_done\n");
+
+ rc = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sshdr);
+ if (!rc)
+ goto done;
+ switch (sshdr.sense_key) {
+ case NOT_READY:
+ if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) {
+ rc = SCSI_DH_RETRY;
+ h->retries++;
+ break;
+ }
+ /* fall through */
+ default:
+ h->retries++;
+ rc = SCSI_DH_IMM_RETRY;
+ }
+
+done:
+ if (rc == SCSI_DH_OK || rc == SCSI_DH_IO)
+ h->retries = 0;
+ else if (h->retries > HP_SW_RETRIES) {
+ h->retries = 0;
+ rc = SCSI_DH_IO;
+ }
+ return rc;
+}
+
+static int hp_sw_activate(struct scsi_device *sdev)
+{
+ struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+ struct request *req;
+ int ret = SCSI_DH_RES_TEMP_UNAVAIL;
+
+ req = blk_get_request(sdev->request_queue, WRITE, GFP_ATOMIC);
+ if (!req)
+ goto done;
+
+ sdev_printk(KERN_INFO, sdev, "sending START_STOP.");
+
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ req->cmd_flags |= REQ_FAILFAST;
+ req->cmd_len = COMMAND_SIZE(START_STOP);
+ memset(req->cmd, 0, MAX_COMMAND_SIZE);
+ req->cmd[0] = START_STOP;
+ req->cmd[4] = 1; /* Start spin cycle */
+ req->timeout = HP_SW_TIMEOUT;
+ req->sense = h->sense;
+ memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ req->sense_len = 0;
+
+ ret = blk_execute_rq(req->q, NULL, req, 1);
+ if (!ret) /* SUCCESS */
+ ret = hp_sw_done(sdev);
+ else
+ ret = SCSI_DH_IO;
+done:
+ return ret;
+}
+
+static const struct {
+ char *vendor;
+ char *model;
+} hp_sw_dh_data_list[] = {
+ {"COMPAQ", "MSA"},
+ {"HP", "HSV"},
+ {"DEC", "HSG80"},
+ {NULL, NULL},
+};
+
+static int hp_sw_bus_notify(struct notifier_block *, unsigned long, void *);
+
+static struct scsi_device_handler hp_sw_dh = {
+ .name = HP_SW_NAME,
+ .module = THIS_MODULE,
+ .nb.notifier_call = hp_sw_bus_notify,
+ .activate = hp_sw_activate,
+};
+
+static int hp_sw_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_dh_data *scsi_dh_data;
+ int i, found = 0;
+ unsigned long flags;
+
+ if (action == BUS_NOTIFY_ADD_DEVICE) {
+ for (i = 0; hp_sw_dh_data_list[i].vendor; i++) {
+ if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor,
+ strlen(hp_sw_dh_data_list[i].vendor)) &&
+ !strncmp(sdev->model, hp_sw_dh_data_list[i].model,
+ strlen(hp_sw_dh_data_list[i].model))) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ goto out;
+
+ scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ + sizeof(struct hp_sw_dh_data) , GFP_KERNEL);
+ if (!scsi_dh_data) {
+ sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n",
+ HP_SW_NAME);
+ goto out;
+ }
+
+ scsi_dh_data->scsi_dh = &hp_sw_dh;
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ sdev->scsi_dh_data = scsi_dh_data;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+ try_module_get(THIS_MODULE);
+
+ sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME);
+ } else if (action == BUS_NOTIFY_DEL_DEVICE) {
+ if (sdev->scsi_dh_data == NULL ||
+ sdev->scsi_dh_data->scsi_dh != &hp_sw_dh)
+ goto out;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ scsi_dh_data = sdev->scsi_dh_data;
+ sdev->scsi_dh_data = NULL;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+ module_put(THIS_MODULE);
+
+ sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", HP_SW_NAME);
+
+ kfree(scsi_dh_data);
+ }
+
+out:
+ return 0;
+}
+
+static int __init hp_sw_init(void)
+{
+ return scsi_register_device_handler(&hp_sw_dh);
+}
+
+static void __exit hp_sw_exit(void)
+{
+ scsi_unregister_device_handler(&hp_sw_dh);
+}
+
+module_init(hp_sw_init);
+module_exit(hp_sw_exit);
+
+MODULE_DESCRIPTION("HP MSA 1000");
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
new file mode 100644
index 00000000000..6fff077a888
--- /dev/null
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -0,0 +1,691 @@
+/*
+ * Engenio/LSI 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>
+
+#define RDAC_NAME "rdac"
+
+/*
+ * 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
+
+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];
+};
+
+struct rdac_controller {
+ u8 subsys_id[SUBSYS_ID_LEN];
+ u8 slot_id[SLOT_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;
+};
+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[16];
+ u8 array_user_label_len;
+ u8 array_user_label[60];
+ u8 lun[8];
+};
+
+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 rdac_controller *ctlr;
+#define UNINITIALIZED_LUN (1 << 8)
+ unsigned lun;
+#define RDAC_STATE_ACTIVE 0
+#define RDAC_STATE_PASSIVE 1
+ unsigned char state;
+ 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 LIST_HEAD(ctlr_list);
+static DEFINE_SPINLOCK(list_lock);
+
+static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
+{
+ struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
+ BUG_ON(scsi_dh_data == NULL);
+ return ((struct rdac_dh_data *) scsi_dh_data->buf);
+}
+
+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;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ rq = blk_get_request(q, rw, GFP_KERNEL);
+
+ if (!rq) {
+ sdev_printk(KERN_INFO, sdev,
+ "get_rdac_req: blk_get_request failed.\n");
+ return NULL;
+ }
+
+ if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) {
+ blk_put_request(rq);
+ sdev_printk(KERN_INFO, sdev,
+ "get_rdac_req: blk_rq_map_kern failed.\n");
+ return NULL;
+ }
+
+ memset(&rq->cmd, 0, BLK_MAX_CDB);
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = 0;
+
+ rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
+ rq->retries = RDAC_RETRIES;
+ rq->timeout = RDAC_TIMEOUT;
+
+ return rq;
+}
+
+static struct request *rdac_failover_get(struct scsi_device *sdev)
+{
+ struct request *rq;
+ struct rdac_mode_common *common;
+ unsigned data_size;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ 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;
+ rdac_pg->lun_table[h->lun] = 0x81;
+ } 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;
+ rdac_pg->lun_table[h->lun] = 0x81;
+ }
+ common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
+ common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
+ common->rdac_options = RDAC_FORCED_QUIESENCE;
+
+ /* 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]);
+
+ return rq;
+}
+
+static void release_controller(struct kref *kref)
+{
+ struct rdac_controller *ctlr;
+ ctlr = container_of(kref, struct rdac_controller, kref);
+
+ spin_lock(&list_lock);
+ list_del(&ctlr->node);
+ spin_unlock(&list_lock);
+ kfree(ctlr);
+}
+
+static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id)
+{
+ struct rdac_controller *ctlr, *tmp;
+
+ spin_lock(&list_lock);
+
+ list_for_each_entry(tmp, &ctlr_list, node) {
+ if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
+ (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
+ kref_get(&tmp->kref);
+ spin_unlock(&list_lock);
+ return tmp;
+ }
+ }
+ ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
+ if (!ctlr)
+ goto done;
+
+ /* initialize fields of controller */
+ memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
+ memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
+ kref_init(&ctlr->kref);
+ ctlr->use_ms10 = -1;
+ list_add(&ctlr->node, &ctlr_list);
+done:
+ spin_unlock(&list_lock);
+ return ctlr;
+}
+
+static int submit_inquiry(struct scsi_device *sdev, int page_code,
+ unsigned int len)
+{
+ struct request *rq;
+ struct request_queue *q = sdev->request_queue;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ 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);
+ err = blk_execute_rq(q, NULL, rq, 1);
+ if (err == -EIO)
+ err = SCSI_DH_IO;
+done:
+ return err;
+}
+
+static int get_lun(struct scsi_device *sdev)
+{
+ int err;
+ struct c8_inquiry *inqp;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry));
+ if (err == SCSI_DH_OK) {
+ inqp = &h->inq.c8;
+ h->lun = inqp->lun[7]; /* currently it uses only one byte */
+ }
+ return err;
+}
+
+#define RDAC_OWNED 0
+#define RDAC_UNOWNED 1
+#define RDAC_FAILED 2
+static int check_ownership(struct scsi_device *sdev)
+{
+ int err;
+ struct c9_inquiry *inqp;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry));
+ if (err == SCSI_DH_OK) {
+ err = RDAC_UNOWNED;
+ inqp = &h->inq.c9;
+ /*
+ * If in AVT mode or if the path already owns the LUN,
+ * return RDAC_OWNED;
+ */
+ if (((inqp->avte_cvp >> 7) == 0x1) ||
+ ((inqp->avte_cvp & 0x1) != 0))
+ err = RDAC_OWNED;
+ } else
+ err = RDAC_FAILED;
+ return err;
+}
+
+static int initialize_controller(struct scsi_device *sdev)
+{
+ int err;
+ struct c4_inquiry *inqp;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry));
+ if (err == SCSI_DH_OK) {
+ inqp = &h->inq.c4;
+ h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id);
+ if (!h->ctlr)
+ err = SCSI_DH_RES_TEMP_UNAVAIL;
+ }
+ return err;
+}
+
+static int set_mode_select(struct scsi_device *sdev)
+{
+ int err;
+ struct c2_inquiry *inqp;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+
+ err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry));
+ 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)
+{
+ struct scsi_sense_hdr sense_hdr;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ int sense, err = SCSI_DH_IO, ret;
+
+ ret = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
+ if (!ret)
+ goto done;
+
+ err = SCSI_DH_OK;
+ sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
+ sense_hdr.ascq;
+ /* If it is retryable failure, submit the c9 inquiry again */
+ if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
+ sense == 0x62900) {
+ /* 0x59136 - Command lock contention
+ * 0x[6b]8b02 - Quiesense in progress or achieved
+ * 0x62900 - Power On, Reset, or Bus Device Reset
+ */
+ err = SCSI_DH_RETRY;
+ }
+
+ if (sense)
+ sdev_printk(KERN_INFO, sdev,
+ "MODE_SELECT failed with sense 0x%x.\n", sense);
+done:
+ return err;
+}
+
+static int send_mode_select(struct scsi_device *sdev)
+{
+ struct request *rq;
+ struct request_queue *q = sdev->request_queue;
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ int err = SCSI_DH_RES_TEMP_UNAVAIL;
+
+ rq = rdac_failover_get(sdev);
+ if (!rq)
+ goto done;
+
+ sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command.\n");
+
+ err = blk_execute_rq(q, NULL, rq, 1);
+ if (err != SCSI_DH_OK)
+ err = mode_select_handle_sense(sdev);
+ if (err == SCSI_DH_OK)
+ h->state = RDAC_STATE_ACTIVE;
+done:
+ return err;
+}
+
+static int rdac_activate(struct scsi_device *sdev)
+{
+ struct rdac_dh_data *h = get_rdac_data(sdev);
+ int err = SCSI_DH_OK;
+
+ if (h->lun == UNINITIALIZED_LUN) {
+ err = get_lun(sdev);
+ if (err != SCSI_DH_OK)
+ goto done;
+ }
+
+ err = check_ownership(sdev);
+ switch (err) {
+ case RDAC_UNOWNED:
+ break;
+ case RDAC_OWNED:
+ err = SCSI_DH_OK;
+ goto done;
+ case RDAC_FAILED:
+ default:
+ err = SCSI_DH_IO;
+ goto done;
+ }
+
+ if (!h->ctlr) {
+ err = initialize_controller(sdev);
+ if (err != SCSI_DH_OK)
+ goto done;
+ }
+
+ if (h->ctlr->use_ms10 == -1) {
+ err = set_mode_select(sdev);
+ if (err != SCSI_DH_OK)
+ goto done;
+ }
+
+ err = send_mode_select(sdev);
+done:
+ return err;
+}
+
+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);
+ switch (sense_hdr->sense_key) {
+ case NOT_READY:
+ 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 NEEDS_RETRY;
+ 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 NEEDS_RETRY;
+ 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", "1814"},
+ {"IBM", "1815"},
+ {"IBM", "1818"},
+ {"IBM", "3526"},
+ {"SGI", "TP9400"},
+ {"SGI", "TP9500"},
+ {"SGI", "IS"},
+ {"STK", "OPENstorage D280"},
+ {"SUN", "CSM200_R"},
+ {"SUN", "LCSM100_F"},
+ {NULL, NULL},
+};
+
+static int rdac_bus_notify(struct notifier_block *, unsigned long, void *);
+
+static struct scsi_device_handler rdac_dh = {
+ .name = RDAC_NAME,
+ .module = THIS_MODULE,
+ .nb.notifier_call = rdac_bus_notify,
+ .prep_fn = rdac_prep_fn,
+ .check_sense = rdac_check_sense,
+ .activate = rdac_activate,
+};
+
+/*
+ * TODO: need some interface so we can set trespass values
+ */
+static int rdac_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct scsi_dh_data *scsi_dh_data;
+ struct rdac_dh_data *h;
+ int i, found = 0;
+ unsigned long flags;
+
+ if (action == BUS_NOTIFY_ADD_DEVICE) {
+ 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))) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ goto out;
+
+ scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
+ + sizeof(*h) , GFP_KERNEL);
+ if (!scsi_dh_data) {
+ sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
+ RDAC_NAME);
+ goto out;
+ }
+
+ scsi_dh_data->scsi_dh = &rdac_dh;
+ h = (struct rdac_dh_data *) scsi_dh_data->buf;
+ h->lun = UNINITIALIZED_LUN;
+ h->state = RDAC_STATE_ACTIVE;
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ sdev->scsi_dh_data = scsi_dh_data;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+ try_module_get(THIS_MODULE);
+
+ sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", RDAC_NAME);
+
+ } else if (action == BUS_NOTIFY_DEL_DEVICE) {
+ if (sdev->scsi_dh_data == NULL ||
+ sdev->scsi_dh_data->scsi_dh != &rdac_dh)
+ goto out;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ scsi_dh_data = sdev->scsi_dh_data;
+ sdev->scsi_dh_data = NULL;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ h = (struct rdac_dh_data *) scsi_dh_data->buf;
+ if (h->ctlr)
+ kref_put(&h->ctlr->kref, release_controller);
+ kfree(scsi_dh_data);
+ module_put(THIS_MODULE);
+ sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", RDAC_NAME);
+ }
+
+out:
+ return 0;
+}
+
+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.");
+ return r;
+}
+
+static void __exit rdac_exit(void)
+{
+ scsi_unregister_device_handler(&rdac_dh);
+}
+
+module_init(rdac_init);
+module_exit(rdac_exit);
+
+MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
+MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-12 01:26:27 +0000