i2o: move to staging

The I2O layer deals with a technology that to say the least didn't catch on
in the market.

The only relevant products are some of the AMI MegaRAID - which supported I2O
and its native mode (The native mode is faster and runs on Linux), an
obscure crypto ethernet card that's now so many years out of date nobody
would use it, the old DPT controllers, which speak their own dialect and
have their own driver - and ermm.. thats about it.

We also know the code isn't in good shape as recently a patch was proposed
and queried as buggy, which in turn showed the existing code was broken
already by prior "clean up" and nobody had noticed that either.

It's coding style robot code nothing more. Like some forgotten corridor
cleaned relentlessly by a lost Roomba but where no user has trodden in years.

Move it to staging and then to /dev/null.

The headers remain as they are shared with dpt_i2o.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 814 insertions, 0 deletions

diff --git a/drivers/staging/i2o/i2o_scsi.c b/drivers/staging/i2o/i2o_scsi.c
new file mode 100644
index 000000000000..1b11dcb3faea
--- /dev/null
+++ b/drivers/staging/i2o/i2o_scsi.c
@@ -0,0 +1,814 @@
+/*
+ * 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.
+ *
+ * For the avoidance of doubt the "preferred form" of this code is one which
+ * is in an open non patent encumbered format. Where cryptographic key signing
+ * forms part of the process of creating an executable the information
+ * including keys needed to generate an equivalently functional executable
+ * are deemed to be part of the source code.
+ *
+ *  Complications for I2O scsi
+ *
+ *	o	Each (bus,lun) is a logical device in I2O. We keep a map
+ *		table. We spoof failed selection for unmapped units
+ *	o	Request sense buffers can come back for free.
+ *	o	Scatter gather is a bit dynamic. We have to investigate at
+ *		setup time.
+ *	o	Some of our resources are dynamically shared. The i2o core
+ *		needs a message reservation protocol to avoid swap v net
+ *		deadlocking. We need to back off queue requests.
+ *
+ *	In general the firmware wants to help. Where its help isn't performance
+ *	useful we just ignore the aid. Its not worth the code in truth.
+ *
+ * Fixes/additions:
+ *	Steve Ralston:
+ *		Scatter gather now works
+ *	Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *		Minor fixes for 2.6.
+ *
+ * To Do:
+ *	64bit cleanups
+ *	Fix the resource management problems.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/proc_fs.h>
+#include <linux/prefetch.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include "i2o.h"
+#include <linux/scatterlist.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <linux/atomic.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/sg.h>
+
+#define OSM_NAME	"scsi-osm"
+#define OSM_VERSION	"1.316"
+#define OSM_DESCRIPTION	"I2O SCSI Peripheral OSM"
+
+static struct i2o_driver i2o_scsi_driver;
+
+static unsigned int i2o_scsi_max_id = 16;
+static unsigned int i2o_scsi_max_lun = 255;
+
+struct i2o_scsi_host {
+	struct Scsi_Host *scsi_host;	/* pointer to the SCSI host */
+	struct i2o_controller *iop;	/* pointer to the I2O controller */
+	u64 lun;	/* lun's used for block devices */
+	struct i2o_device *channel[0];	/* channel->i2o_dev mapping table */
+};
+
+static struct scsi_host_template i2o_scsi_host_template;
+
+#define I2O_SCSI_CAN_QUEUE	4
+
+/* SCSI OSM class handling definition */
+static struct i2o_class_id i2o_scsi_class_id[] = {
+	{I2O_CLASS_SCSI_PERIPHERAL},
+	{I2O_CLASS_END}
+};
+
+static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c)
+{
+	struct i2o_scsi_host *i2o_shost;
+	struct i2o_device *i2o_dev;
+	struct Scsi_Host *scsi_host;
+	int max_channel = 0;
+	u8 type;
+	int i;
+	size_t size;
+	u16 body_size = 6;
+
+#ifdef CONFIG_I2O_EXT_ADAPTEC
+	if (c->adaptec)
+		body_size = 8;
+#endif
+
+	list_for_each_entry(i2o_dev, &c->devices, list)
+	    if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
+		if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
+		    && (type == 0x01))	/* SCSI bus */
+			max_channel++;
+	}
+
+	if (!max_channel) {
+		osm_warn("no channels found on %s\n", c->name);
+		return ERR_PTR(-EFAULT);
+	}
+
+	size = max_channel * sizeof(struct i2o_device *)
+	    + sizeof(struct i2o_scsi_host);
+
+	scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size);
+	if (!scsi_host) {
+		osm_warn("Could not allocate SCSI host\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	scsi_host->max_channel = max_channel - 1;
+	scsi_host->max_id = i2o_scsi_max_id;
+	scsi_host->max_lun = i2o_scsi_max_lun;
+	scsi_host->this_id = c->unit;
+	scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size);
+
+	i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
+	i2o_shost->scsi_host = scsi_host;
+	i2o_shost->iop = c;
+	i2o_shost->lun = 1;
+
+	i = 0;
+	list_for_each_entry(i2o_dev, &c->devices, list)
+	    if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
+		if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
+		    && (type == 0x01))	/* only SCSI bus */
+			i2o_shost->channel[i++] = i2o_dev;
+
+		if (i >= max_channel)
+			break;
+	}
+
+	return i2o_shost;
+};
+
+/**
+ *	i2o_scsi_get_host - Get an I2O SCSI host
+ *	@c: I2O controller to for which to get the SCSI host
+ *
+ *	If the I2O controller already exists as SCSI host, the SCSI host
+ *	is returned, otherwise the I2O controller is added to the SCSI
+ *	core.
+ *
+ *	Returns pointer to the I2O SCSI host on success or NULL on failure.
+ */
+static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c)
+{
+	return c->driver_data[i2o_scsi_driver.context];
+};
+
+/**
+ *	i2o_scsi_remove - Remove I2O device from SCSI core
+ *	@dev: device which should be removed
+ *
+ *	Removes the I2O device from the SCSI core again.
+ *
+ *	Returns 0 on success.
+ */
+static int i2o_scsi_remove(struct device *dev)
+{
+	struct i2o_device *i2o_dev = to_i2o_device(dev);
+	struct i2o_controller *c = i2o_dev->iop;
+	struct i2o_scsi_host *i2o_shost;
+	struct scsi_device *scsi_dev;
+
+	osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
+
+	i2o_shost = i2o_scsi_get_host(c);
+
+	shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
+	    if (scsi_dev->hostdata == i2o_dev) {
+		sysfs_remove_link(&i2o_dev->device.kobj, "scsi");
+		scsi_remove_device(scsi_dev);
+		scsi_device_put(scsi_dev);
+		break;
+	}
+
+	return 0;
+};
+
+/**
+ *	i2o_scsi_probe - verify if dev is a I2O SCSI device and install it
+ *	@dev: device to verify if it is a I2O SCSI device
+ *
+ *	Retrieve channel, id and lun for I2O device. If everything goes well
+ *	register the I2O device as SCSI device on the I2O SCSI controller.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_scsi_probe(struct device *dev)
+{
+	struct i2o_device *i2o_dev = to_i2o_device(dev);
+	struct i2o_controller *c = i2o_dev->iop;
+	struct i2o_scsi_host *i2o_shost;
+	struct Scsi_Host *scsi_host;
+	struct i2o_device *parent;
+	struct scsi_device *scsi_dev;
+	u32 id = -1;
+	u64 lun = -1;
+	int channel = -1;
+	int i, rc;
+
+	i2o_shost = i2o_scsi_get_host(c);
+	if (!i2o_shost)
+		return -EFAULT;
+
+	scsi_host = i2o_shost->scsi_host;
+
+	switch (i2o_dev->lct_data.class_id) {
+	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
+	case I2O_CLASS_EXECUTIVE:
+#ifdef CONFIG_I2O_EXT_ADAPTEC
+		if (c->adaptec) {
+			u8 type;
+			struct i2o_device *d = i2o_shost->channel[0];
+
+			if (!i2o_parm_field_get(d, 0x0000, 0, &type, 1)
+			    && (type == 0x01))	/* SCSI bus */
+				if (!i2o_parm_field_get(d, 0x0200, 4, &id, 4)) {
+					channel = 0;
+					if (i2o_dev->lct_data.class_id ==
+					    I2O_CLASS_RANDOM_BLOCK_STORAGE)
+						lun =
+						    cpu_to_le64(i2o_shost->
+								lun++);
+					else
+						lun = 0;
+				}
+		}
+#endif
+		break;
+
+	case I2O_CLASS_SCSI_PERIPHERAL:
+		if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4))
+			return -EFAULT;
+
+		if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8))
+			return -EFAULT;
+
+		parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid);
+		if (!parent) {
+			osm_warn("can not find parent of device %03x\n",
+				 i2o_dev->lct_data.tid);
+			return -EFAULT;
+		}
+
+		for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++)
+			if (i2o_shost->channel[i] == parent)
+				channel = i;
+		break;
+
+	default:
+		return -EFAULT;
+	}
+
+	if (channel == -1) {
+		osm_warn("can not find channel of device %03x\n",
+			 i2o_dev->lct_data.tid);
+		return -EFAULT;
+	}
+
+	if (le32_to_cpu(id) >= scsi_host->max_id) {
+		osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)",
+			 le32_to_cpu(id), scsi_host->max_id);
+		return -EFAULT;
+	}
+
+	if (le64_to_cpu(lun) >= scsi_host->max_lun) {
+		osm_warn("SCSI device lun (%llu) >= max_lun of I2O host (%llu)",
+			 le64_to_cpu(lun), scsi_host->max_lun);
+		return -EFAULT;
+	}
+
+	scsi_dev =
+	    __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id),
+			      le64_to_cpu(lun), i2o_dev);
+
+	if (IS_ERR(scsi_dev)) {
+		osm_warn("can not add SCSI device %03x\n",
+			 i2o_dev->lct_data.tid);
+		return PTR_ERR(scsi_dev);
+	}
+
+	rc = sysfs_create_link(&i2o_dev->device.kobj,
+			       &scsi_dev->sdev_gendev.kobj, "scsi");
+	if (rc)
+		goto err;
+
+	osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %llu\n",
+		 i2o_dev->lct_data.tid, channel, le32_to_cpu(id),
+		 le64_to_cpu(lun));
+
+	return 0;
+
+err:
+	scsi_remove_device(scsi_dev);
+	return rc;
+};
+
+static const char *i2o_scsi_info(struct Scsi_Host *SChost)
+{
+	struct i2o_scsi_host *hostdata;
+	hostdata = (struct i2o_scsi_host *)SChost->hostdata;
+	return hostdata->iop->name;
+}
+
+/**
+ *	i2o_scsi_reply - SCSI OSM message reply handler
+ *	@c: controller issuing the reply
+ *	@m: message id for flushing
+ *	@msg: the message from the controller
+ *
+ *	Process reply messages (interrupts in normal scsi controller think).
+ *	We can get a variety of messages to process. The normal path is
+ *	scsi command completions. We must also deal with IOP failures,
+ *	the reply to a bus reset and the reply to a LUN query.
+ *
+ *	Returns 0 on success and if the reply should not be flushed or > 0
+ *	on success and if the reply should be flushed. Returns negative error
+ *	code on failure and if the reply should be flushed.
+ */
+static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
+			  struct i2o_message *msg)
+{
+	struct scsi_cmnd *cmd;
+	u32 error;
+	struct device *dev;
+
+	cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
+	if (unlikely(!cmd)) {
+		osm_err("NULL reply received!\n");
+		return -1;
+	}
+
+	/*
+	 *      Low byte is device status, next is adapter status,
+	 *      (then one byte reserved), then request status.
+	 */
+	error = le32_to_cpu(msg->body[0]);
+
+	osm_debug("Completed %0x%p\n", cmd);
+
+	cmd->result = error & 0xff;
+	/*
+	 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
+	 * the SCSI layer handle the error
+	 */
+	if (cmd->result)
+		memcpy(cmd->sense_buffer, &msg->body[3],
+		       min(SCSI_SENSE_BUFFERSIZE, 40));
+
+	/* only output error code if AdapterStatus is not HBA_SUCCESS */
+	if ((error >> 8) & 0xff)
+		osm_err("SCSI error %08x\n", error);
+
+	dev = &c->pdev->dev;
+
+	scsi_dma_unmap(cmd);
+
+	cmd->scsi_done(cmd);
+
+	return 1;
+};
+
+/**
+ *	i2o_scsi_notify_device_add - Retrieve notifications of added devices
+ *	@i2o_dev: the I2O device which was added
+ *
+ *	If a I2O device is added we catch the notification, because I2O classes
+ *	other than SCSI peripheral will not be received through
+ *	i2o_scsi_probe().
+ */
+static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
+{
+	switch (i2o_dev->lct_data.class_id) {
+	case I2O_CLASS_EXECUTIVE:
+	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
+		i2o_scsi_probe(&i2o_dev->device);
+		break;
+
+	default:
+		break;
+	}
+};
+
+/**
+ *	i2o_scsi_notify_device_remove - Retrieve notifications of removed devices
+ *	@i2o_dev: the I2O device which was removed
+ *
+ *	If a I2O device is removed, we catch the notification to remove the
+ *	corresponding SCSI device.
+ */
+static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
+{
+	switch (i2o_dev->lct_data.class_id) {
+	case I2O_CLASS_EXECUTIVE:
+	case I2O_CLASS_RANDOM_BLOCK_STORAGE:
+		i2o_scsi_remove(&i2o_dev->device);
+		break;
+
+	default:
+		break;
+	}
+};
+
+/**
+ *	i2o_scsi_notify_controller_add - Retrieve notifications of added controllers
+ *	@c: the controller which was added
+ *
+ *	If a I2O controller is added, we catch the notification to add a
+ *	corresponding Scsi_Host.
+ */
+static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
+{
+	struct i2o_scsi_host *i2o_shost;
+	int rc;
+
+	i2o_shost = i2o_scsi_host_alloc(c);
+	if (IS_ERR(i2o_shost)) {
+		osm_err("Could not initialize SCSI host\n");
+		return;
+	}
+
+	rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
+	if (rc) {
+		osm_err("Could not add SCSI host\n");
+		scsi_host_put(i2o_shost->scsi_host);
+		return;
+	}
+
+	c->driver_data[i2o_scsi_driver.context] = i2o_shost;
+
+	osm_debug("new I2O SCSI host added\n");
+};
+
+/**
+ *	i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers
+ *	@c: the controller which was removed
+ *
+ *	If a I2O controller is removed, we catch the notification to remove the
+ *	corresponding Scsi_Host.
+ */
+static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
+{
+	struct i2o_scsi_host *i2o_shost;
+	i2o_shost = i2o_scsi_get_host(c);
+	if (!i2o_shost)
+		return;
+
+	c->driver_data[i2o_scsi_driver.context] = NULL;
+
+	scsi_remove_host(i2o_shost->scsi_host);
+	scsi_host_put(i2o_shost->scsi_host);
+	osm_debug("I2O SCSI host removed\n");
+};
+
+/* SCSI OSM driver struct */
+static struct i2o_driver i2o_scsi_driver = {
+	.name = OSM_NAME,
+	.reply = i2o_scsi_reply,
+	.classes = i2o_scsi_class_id,
+	.notify_device_add = i2o_scsi_notify_device_add,
+	.notify_device_remove = i2o_scsi_notify_device_remove,
+	.notify_controller_add = i2o_scsi_notify_controller_add,
+	.notify_controller_remove = i2o_scsi_notify_controller_remove,
+	.driver = {
+		   .probe = i2o_scsi_probe,
+		   .remove = i2o_scsi_remove,
+		   },
+};
+
+/**
+ *	i2o_scsi_queuecommand - queue a SCSI command
+ *	@SCpnt: scsi command pointer
+ *	@done: callback for completion
+ *
+ *	Issue a scsi command asynchronously. Return 0 on success or 1 if
+ *	we hit an error (normally message queue congestion). The only
+ *	minor complication here is that I2O deals with the device addressing
+ *	so we have to map the bus/dev/lun back to an I2O handle as well
+ *	as faking absent devices ourself.
+ *
+ *	Locks: takes the controller lock on error path only
+ */
+
+static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt,
+				 void (*done) (struct scsi_cmnd *))
+{
+	struct i2o_controller *c;
+	struct i2o_device *i2o_dev;
+	int tid;
+	struct i2o_message *msg;
+	/*
+	 * ENABLE_DISCONNECT
+	 * SIMPLE_TAG
+	 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
+	 */
+	u32 scsi_flags = 0x20a00000;
+	u32 sgl_offset;
+	u32 *mptr;
+	u32 cmd = I2O_CMD_SCSI_EXEC << 24;
+	int rc = 0;
+
+	/*
+	 *      Do the incoming paperwork
+	 */
+	i2o_dev = SCpnt->device->hostdata;
+
+	SCpnt->scsi_done = done;
+
+	if (unlikely(!i2o_dev)) {
+		osm_warn("no I2O device in request\n");
+		SCpnt->result = DID_NO_CONNECT << 16;
+		done(SCpnt);
+		goto exit;
+	}
+	c = i2o_dev->iop;
+	tid = i2o_dev->lct_data.tid;
+
+	osm_debug("qcmd: Tid = %03x\n", tid);
+	osm_debug("Real scsi messages.\n");
+
+	/*
+	 *      Put together a scsi execscb message
+	 */
+	switch (SCpnt->sc_data_direction) {
+	case PCI_DMA_NONE:
+		/* DATA NO XFER */
+		sgl_offset = SGL_OFFSET_0;
+		break;
+
+	case PCI_DMA_TODEVICE:
+		/* DATA OUT (iop-->dev) */
+		scsi_flags |= 0x80000000;
+		sgl_offset = SGL_OFFSET_10;
+		break;
+
+	case PCI_DMA_FROMDEVICE:
+		/* DATA IN  (iop<--dev) */
+		scsi_flags |= 0x40000000;
+		sgl_offset = SGL_OFFSET_10;
+		break;
+
+	default:
+		/* Unknown - kill the command */
+		SCpnt->result = DID_NO_CONNECT << 16;
+		done(SCpnt);
+		goto exit;
+	}
+
+	/*
+	 *      Obtain an I2O message. If there are none free then
+	 *      throw it back to the scsi layer
+	 */
+
+	msg = i2o_msg_get(c);
+	if (IS_ERR(msg)) {
+		rc = SCSI_MLQUEUE_HOST_BUSY;
+		goto exit;
+	}
+
+	mptr = &msg->body[0];
+
+#if 0 /* this code can't work */
+#ifdef CONFIG_I2O_EXT_ADAPTEC
+	if (c->adaptec) {
+		u32 adpt_flags = 0;
+
+		if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) {
+			i2o_sg_io_hdr_t __user *usr_ptr =
+			    ((Sg_request *) (SCpnt->sc_request->
+					     upper_private_data))->header.
+			    usr_ptr;
+
+			if (usr_ptr)
+				get_user(adpt_flags, &usr_ptr->flags);
+		}
+
+		switch (i2o_dev->lct_data.class_id) {
+		case I2O_CLASS_EXECUTIVE:
+		case I2O_CLASS_RANDOM_BLOCK_STORAGE:
+			/* interpret flag has to be set for executive */
+			adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET;
+			break;
+
+		default:
+			break;
+		}
+
+		/*
+		 * for Adaptec controllers we use the PRIVATE command, because
+		 * the normal SCSI EXEC doesn't support all SCSI commands on
+		 * all controllers (for example READ CAPACITY).
+		 */
+		if (sgl_offset == SGL_OFFSET_10)
+			sgl_offset = SGL_OFFSET_12;
+		cmd = I2O_CMD_PRIVATE << 24;
+		*mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
+		*mptr++ = cpu_to_le32(adpt_flags | tid);
+	}
+#endif
+#endif
+
+	msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
+	msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context);
+
+	/* We want the SCSI control block back */
+	msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt));
+
+	/* LSI_920_PCI_QUIRK
+	 *
+	 *      Intermittant observations of msg frame word data corruption
+	 *      observed on msg[4] after:
+	 *        WRITE, READ-MODIFY-WRITE
+	 *      operations.  19990606 -sralston
+	 *
+	 *      (Hence we build this word via tag. Its good practice anyway
+	 *       we don't want fetches over PCI needlessly)
+	 */
+
+	/* Attach tags to the devices */
+	/* FIXME: implement
+	   if(SCpnt->device->tagged_supported) {
+	   if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
+	   scsi_flags |= 0x01000000;
+	   else if(SCpnt->tag == ORDERED_QUEUE_TAG)
+	   scsi_flags |= 0x01800000;
+	   }
+	 */
+
+	*mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len);
+
+	/* Write SCSI command into the message - always 16 byte block */
+	memcpy(mptr, SCpnt->cmnd, 16);
+	mptr += 4;
+
+	if (sgl_offset != SGL_OFFSET_0) {
+		/* write size of data addressed by SGL */
+		*mptr++ = cpu_to_le32(scsi_bufflen(SCpnt));
+
+		/* Now fill in the SGList and command */
+
+		if (scsi_sg_count(SCpnt)) {
+			if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt),
+					    scsi_sg_count(SCpnt),
+					    SCpnt->sc_data_direction, &mptr))
+				goto nomem;
+		}
+	}
+
+	/* Stick the headers on */
+	msg->u.head[0] =
+	    cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);
+
+	/* Queue the message */
+	i2o_msg_post(c, msg);
+
+	osm_debug("Issued %0x%p\n", SCpnt);
+
+	return 0;
+
+      nomem:
+	rc = -ENOMEM;
+	i2o_msg_nop(c, msg);
+
+      exit:
+	return rc;
+}
+
+static DEF_SCSI_QCMD(i2o_scsi_queuecommand)
+
+/**
+ *	i2o_scsi_abort - abort a running command
+ *	@SCpnt: command to abort
+ *
+ *	Ask the I2O controller to abort a command. This is an asynchrnous
+ *	process and our callback handler will see the command complete with an
+ *	aborted message if it succeeds.
+ *
+ *	Returns 0 if the command is successfully aborted or negative error code
+ *	on failure.
+ */
+static int i2o_scsi_abort(struct scsi_cmnd *SCpnt)
+{
+	struct i2o_device *i2o_dev;
+	struct i2o_controller *c;
+	struct i2o_message *msg;
+	int tid;
+	int status = FAILED;
+
+	osm_warn("Aborting command block.\n");
+
+	i2o_dev = SCpnt->device->hostdata;
+	c = i2o_dev->iop;
+	tid = i2o_dev->lct_data.tid;
+
+	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
+	if (IS_ERR(msg))
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
+	msg->u.head[1] =
+	    cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid);
+	msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt));
+
+	if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT))
+		status = SUCCESS;
+
+	return status;
+}
+
+/**
+ *	i2o_scsi_bios_param	-	Invent disk geometry
+ *	@sdev: scsi device
+ *	@dev: block layer device
+ *	@capacity: size in sectors
+ *	@ip: geometry array
+ *
+ *	This is anyone's guess quite frankly. We use the same rules everyone
+ *	else appears to and hope. It seems to work.
+ */
+
+static int i2o_scsi_bios_param(struct scsi_device *sdev,
+			       struct block_device *dev, sector_t capacity,
+			       int *ip)
+{
+	int size;
+
+	size = capacity;
+	ip[0] = 64;		/* heads                        */
+	ip[1] = 32;		/* sectors                      */
+	if ((ip[2] = size >> 11) > 1024) {	/* cylinders, test for big disk */
+		ip[0] = 255;	/* heads                        */
+		ip[1] = 63;	/* sectors                      */
+		ip[2] = size / (255 * 63);	/* cylinders                    */
+	}
+	return 0;
+}
+
+static struct scsi_host_template i2o_scsi_host_template = {
+	.proc_name = OSM_NAME,
+	.name = OSM_DESCRIPTION,
+	.info = i2o_scsi_info,
+	.queuecommand = i2o_scsi_queuecommand,
+	.eh_abort_handler = i2o_scsi_abort,
+	.bios_param = i2o_scsi_bios_param,
+	.can_queue = I2O_SCSI_CAN_QUEUE,
+	.sg_tablesize = 8,
+	.cmd_per_lun = 6,
+	.use_clustering = ENABLE_CLUSTERING,
+};
+
+/**
+ *	i2o_scsi_init - SCSI OSM initialization function
+ *
+ *	Register SCSI OSM into I2O core.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int __init i2o_scsi_init(void)
+{
+	int rc;
+
+	printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
+
+	/* Register SCSI OSM into I2O core */
+	rc = i2o_driver_register(&i2o_scsi_driver);
+	if (rc) {
+		osm_err("Could not register SCSI driver\n");
+		return rc;
+	}
+
+	return 0;
+};
+
+/**
+ *	i2o_scsi_exit - SCSI OSM exit function
+ *
+ *	Unregisters SCSI OSM from I2O core.
+ */
+static void __exit i2o_scsi_exit(void)
+{
+	/* Unregister I2O SCSI OSM from I2O core */
+	i2o_driver_unregister(&i2o_scsi_driver);
+};
+
+MODULE_AUTHOR("Red Hat Software");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(OSM_DESCRIPTION);
+MODULE_VERSION(OSM_VERSION);
+
+module_init(i2o_scsi_init);
+module_exit(i2o_scsi_exit);