Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 830 insertions, 0 deletions

diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c
new file mode 100644
index 0000000..43f5875
--- /dev/null
+++ b/drivers/message/i2o/i2o_scsi.c
@@ -0,0 +1,830 @@
+/*
+ * 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 <linux/i2o.h>
+
+#include <asm/dma.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#define OSM_NAME	"scsi-osm"
+#define OSM_VERSION	"$Rev$"
+#define OSM_DESCRIPTION	"I2O SCSI Peripheral OSM"
+
+static struct i2o_driver i2o_scsi_driver;
+
+static int i2o_scsi_max_id = 16;
+static int i2o_scsi_max_lun = 8;
+
+struct i2o_scsi_host {
+	struct Scsi_Host *scsi_host;	/* pointer to the SCSI host */
+	struct i2o_controller *iop;	/* pointer to the I2O controller */
+	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;
+	i2o_status_block *sb;
+
+	list_for_each_entry(i2o_dev, &c->devices, list)
+	    if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER_PORT) {
+		if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) || (type == 1))	/* 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;
+
+	sb = c->status_block.virt;
+
+	scsi_host->sg_tablesize = (sb->inbound_frame_size -
+				   sizeof(struct i2o_message) / 4 - 6) / 2;
+
+	i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
+	i2o_shost->scsi_host = scsi_host;
+	i2o_shost->iop = c;
+
+	i = 0;
+	list_for_each_entry(i2o_dev, &c->devices, list)
+	    if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER_PORT) {
+		if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) || (type == 1))	/* 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;
+
+	i2o_shost = i2o_scsi_get_host(c);
+
+	shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
+	    if (scsi_dev->hostdata == i2o_dev) {
+		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 everthing 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;
+	u64 lun;
+	int channel = -1;
+	int i;
+
+	i2o_shost = i2o_scsi_get_host(c);
+	if (!i2o_shost)
+		return -EFAULT;
+
+	scsi_host = i2o_shost->scsi_host;
+
+	if (i2o_parm_field_get(i2o_dev, 0, 3, &id, 4) < 0)
+		return -EFAULT;
+
+	if (id >= scsi_host->max_id) {
+		osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", id,
+			 scsi_host->max_id);
+		return -EFAULT;
+	}
+
+	if (i2o_parm_field_get(i2o_dev, 0, 4, &lun, 8) < 0)
+		return -EFAULT;
+	if (lun >= scsi_host->max_lun) {
+		osm_warn("SCSI device id (%d) >= max_lun of I2O host (%d)",
+			 (unsigned int)lun, scsi_host->max_lun);
+		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;
+
+	if (channel == -1) {
+		osm_warn("can not find channel of device %03x\n",
+			 i2o_dev->lct_data.tid);
+		return -EFAULT;
+	}
+
+	scsi_dev =
+	    __scsi_add_device(i2o_shost->scsi_host, channel, id, lun, i2o_dev);
+
+	if (!scsi_dev) {
+		osm_warn("can not add SCSI device %03x\n",
+			 i2o_dev->lct_data.tid);
+		return -EFAULT;
+	}
+
+	osm_debug("added new SCSI device %03x (cannel: %d, id: %d, lun: %d)\n",
+		  i2o_dev->lct_data.tid, channel, id, (unsigned int)lun);
+
+	return 0;
+};
+
+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;
+	struct device *dev;
+	u8 as, ds, st;
+
+	cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
+
+	if (msg->u.head[0] & (1 << 13)) {
+		struct i2o_message __iomem *pmsg;	/* preserved message */
+		u32 pm;
+		int err = DID_ERROR;
+
+		pm = le32_to_cpu(msg->body[3]);
+
+		pmsg = i2o_msg_in_to_virt(c, pm);
+
+		osm_err("IOP fail.\n");
+		osm_err("From %d To %d Cmd %d.\n",
+			(msg->u.head[1] >> 12) & 0xFFF,
+			msg->u.head[1] & 0xFFF, msg->u.head[1] >> 24);
+		osm_err("Failure Code %d.\n", msg->body[0] >> 24);
+		if (msg->body[0] & (1 << 16))
+			osm_err("Format error.\n");
+		if (msg->body[0] & (1 << 17))
+			osm_err("Path error.\n");
+		if (msg->body[0] & (1 << 18))
+			osm_err("Path State.\n");
+		if (msg->body[0] & (1 << 18))
+		{
+			osm_err("Congestion.\n");
+			err = DID_BUS_BUSY;
+		}
+
+		osm_debug("Failing message is %p.\n", pmsg);
+
+		cmd = i2o_cntxt_list_get(c, readl(&pmsg->u.s.tcntxt));
+		if (!cmd)
+			return 1;
+
+		cmd->result = err << 16;
+		cmd->scsi_done(cmd);
+
+		/* Now flush the message by making it a NOP */
+		i2o_msg_nop(c, pm);
+
+		return 1;
+	}
+
+	/*
+	 *      Low byte is device status, next is adapter status,
+	 *      (then one byte reserved), then request status.
+	 */
+	ds = (u8) le32_to_cpu(msg->body[0]);
+	as = (u8) (le32_to_cpu(msg->body[0]) >> 8);
+	st = (u8) (le32_to_cpu(msg->body[0]) >> 24);
+
+	/*
+	 *      Is this a control request coming back - eg an abort ?
+	 */
+
+	if (!cmd) {
+		if (st)
+			osm_warn("SCSI abort: %08X", le32_to_cpu(msg->body[0]));
+		osm_info("SCSI abort completed.\n");
+		return -EFAULT;
+	}
+
+	osm_debug("Completed %ld\n", cmd->serial_number);
+
+	if (st) {
+		u32 count, error;
+		/* An error has occurred */
+
+		switch (st) {
+		case 0x06:
+			count = le32_to_cpu(msg->body[1]);
+			if (count < cmd->underflow) {
+				int i;
+
+				osm_err("SCSI underflow 0x%08X 0x%08X\n", count,
+					cmd->underflow);
+				osm_debug("Cmd: ");
+				for (i = 0; i < 15; i++)
+					pr_debug("%02X ", cmd->cmnd[i]);
+				pr_debug(".\n");
+				cmd->result = (DID_ERROR << 16);
+			}
+			break;
+
+		default:
+			error = le32_to_cpu(msg->body[0]);
+
+			osm_err("SCSI error %08x\n", error);
+
+			if ((error & 0xff) == 0x02 /*CHECK_CONDITION */ ) {
+				int i;
+				u32 len = sizeof(cmd->sense_buffer);
+				len = (len > 40) ? 40 : len;
+				// Copy over the sense data
+				memcpy(cmd->sense_buffer, (void *)&msg->body[3],
+				       len);
+				for (i = 0; i <= len; i++)
+					osm_info("%02x\n",
+						 cmd->sense_buffer[i]);
+				if (cmd->sense_buffer[0] == 0x70
+				    && cmd->sense_buffer[2] == DATA_PROTECT) {
+					/* This is to handle an array failed */
+					cmd->result = (DID_TIME_OUT << 16);
+					printk(KERN_WARNING "%s: SCSI Data "
+					       "Protect-Device (%d,%d,%d) "
+					       "hba_status=0x%x, dev_status="
+					       "0x%x, cmd=0x%x\n", c->name,
+					       (u32) cmd->device->channel,
+					       (u32) cmd->device->id,
+					       (u32) cmd->device->lun,
+					       (error >> 8) & 0xff,
+					       error & 0xff, cmd->cmnd[0]);
+				} else
+					cmd->result = (DID_ERROR << 16);
+
+				break;
+			}
+
+			switch (as) {
+			case 0x0E:
+				/* SCSI Reset */
+				cmd->result = DID_RESET << 16;
+				break;
+
+			case 0x0F:
+				cmd->result = DID_PARITY << 16;
+				break;
+
+			default:
+				cmd->result = DID_ERROR << 16;
+				break;
+			}
+
+			break;
+		}
+
+		cmd->scsi_done(cmd);
+		return 1;
+	}
+
+	cmd->result = DID_OK << 16 | ds;
+
+	cmd->scsi_done(cmd);
+
+	dev = &c->pdev->dev;
+	if (cmd->use_sg)
+		dma_unmap_sg(dev, (struct scatterlist *)cmd->buffer,
+			     cmd->use_sg, cmd->sc_data_direction);
+	else if (cmd->request_bufflen)
+		dma_unmap_single(dev, (dma_addr_t) ((long)cmd->SCp.ptr),
+				 cmd->request_bufflen, cmd->sc_data_direction);
+
+	return 1;
+};
+
+/**
+ *	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);
+	pr_info("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_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(struct scsi_cmnd *SCpnt,
+				 void (*done) (struct scsi_cmnd *))
+{
+	struct i2o_controller *c;
+	struct Scsi_Host *host;
+	struct i2o_device *i2o_dev;
+	struct device *dev;
+	int tid;
+	struct i2o_message __iomem *msg;
+	u32 m;
+	u32 scsi_flags, sg_flags;
+	u32 __iomem *mptr;
+	u32 __iomem *lenptr;
+	u32 len, reqlen;
+	int i;
+
+	/*
+	 *      Do the incoming paperwork
+	 */
+
+	i2o_dev = SCpnt->device->hostdata;
+	host = SCpnt->device->host;
+	c = i2o_dev->iop;
+	dev = &c->pdev->dev;
+
+	SCpnt->scsi_done = done;
+
+	if (unlikely(!i2o_dev)) {
+		osm_warn("no I2O device in request\n");
+		SCpnt->result = DID_NO_CONNECT << 16;
+		done(SCpnt);
+		return 0;
+	}
+
+	tid = i2o_dev->lct_data.tid;
+
+	osm_debug("qcmd: Tid = %03x\n", tid);
+	osm_debug("Real scsi messages.\n");
+
+	/*
+	 *      Obtain an I2O message. If there are none free then
+	 *      throw it back to the scsi layer
+	 */
+
+	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	/*
+	 *      Put together a scsi execscb message
+	 */
+
+	len = SCpnt->request_bufflen;
+
+	switch (SCpnt->sc_data_direction) {
+	case PCI_DMA_NONE:
+		scsi_flags = 0x00000000;	// DATA NO XFER
+		sg_flags = 0x00000000;
+		break;
+
+	case PCI_DMA_TODEVICE:
+		scsi_flags = 0x80000000;	// DATA OUT (iop-->dev)
+		sg_flags = 0x14000000;
+		break;
+
+	case PCI_DMA_FROMDEVICE:
+		scsi_flags = 0x40000000;	// DATA IN  (iop<--dev)
+		sg_flags = 0x10000000;
+		break;
+
+	default:
+		/* Unknown - kill the command */
+		SCpnt->result = DID_NO_CONNECT << 16;
+		done(SCpnt);
+		return 0;
+	}
+
+	writel(I2O_CMD_SCSI_EXEC << 24 | HOST_TID << 12 | tid, &msg->u.head[1]);
+	writel(i2o_scsi_driver.context, &msg->u.s.icntxt);
+
+	/* We want the SCSI control block back */
+	writel(i2o_cntxt_list_add(c, SCpnt), &msg->u.s.tcntxt);
+
+	/* 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 */
+	/*
+	   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;
+	   }
+	 */
+
+	/* Direction, disconnect ok, tag, CDBLen */
+	writel(scsi_flags | 0x20200000 | SCpnt->cmd_len, &msg->body[0]);
+
+	mptr = &msg->body[1];
+
+	/* Write SCSI command into the message - always 16 byte block */
+	memcpy_toio(mptr, SCpnt->cmnd, 16);
+	mptr += 4;
+	lenptr = mptr++;	/* Remember me - fill in when we know */
+
+	reqlen = 12;		// SINGLE SGE
+
+	/* Now fill in the SGList and command */
+	if (SCpnt->use_sg) {
+		struct scatterlist *sg;
+		int sg_count;
+
+		sg = SCpnt->request_buffer;
+		len = 0;
+
+		sg_count = dma_map_sg(dev, sg, SCpnt->use_sg,
+				      SCpnt->sc_data_direction);
+
+		if (unlikely(sg_count <= 0))
+			return -ENOMEM;
+
+		for (i = SCpnt->use_sg; i > 0; i--) {
+			if (i == 1)
+				sg_flags |= 0xC0000000;
+			writel(sg_flags | sg_dma_len(sg), mptr++);
+			writel(sg_dma_address(sg), mptr++);
+			len += sg_dma_len(sg);
+			sg++;
+		}
+
+		reqlen = mptr - &msg->u.head[0];
+		writel(len, lenptr);
+	} else {
+		len = SCpnt->request_bufflen;
+
+		writel(len, lenptr);
+
+		if (len > 0) {
+			dma_addr_t dma_addr;
+
+			dma_addr = dma_map_single(dev, SCpnt->request_buffer,
+						  SCpnt->request_bufflen,
+						  SCpnt->sc_data_direction);
+			if (!dma_addr)
+				return -ENOMEM;
+
+			SCpnt->SCp.ptr = (void *)(unsigned long)dma_addr;
+			sg_flags |= 0xC0000000;
+			writel(sg_flags | SCpnt->request_bufflen, mptr++);
+			writel(dma_addr, mptr++);
+		} else
+			reqlen = 9;
+	}
+
+	/* Stick the headers on */
+	writel(reqlen << 16 | SGL_OFFSET_10, &msg->u.head[0]);
+
+	/* Queue the message */
+	i2o_msg_post(c, m);
+
+	osm_debug("Issued %ld\n", SCpnt->serial_number);
+
+	return 0;
+};
+
+/**
+ *	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 __iomem *msg;
+	u32 m;
+	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;
+
+	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+	writel(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid,
+	       &msg->u.head[1]);
+	writel(i2o_cntxt_list_get_ptr(c, SCpnt), &msg->body[0]);
+
+	if (i2o_msg_post_wait(c, m, 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 anyones 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);