Linux-2.6.12-rc2v2.6.12-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, 1247 insertions, 0 deletions

diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
new file mode 100644
index 0000000..7b74c87
--- /dev/null
+++ b/drivers/message/i2o/i2o_block.c
@@ -0,0 +1,1247 @@
+/*
+ *	Block OSM
+ *
+ * 	Copyright (C) 1999-2002	Red Hat Software
+ *
+ *	Written by Alan Cox, Building Number Three Ltd
+ *
+ *	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.
+ *
+ *	For the purpose of avoiding doubt the preferred form of the work
+ *	for making modifications shall be a standards compliant form such
+ *	gzipped tar and not one requiring a proprietary or patent encumbered
+ *	tool to unpack.
+ *
+ *	Fixes/additions:
+ *		Steve Ralston:
+ *			Multiple device handling error fixes,
+ *			Added a queue depth.
+ *		Alan Cox:
+ *			FC920 has an rmw bug. Dont or in the end marker.
+ *			Removed queue walk, fixed for 64bitness.
+ *			Rewrote much of the code over time
+ *			Added indirect block lists
+ *			Handle 64K limits on many controllers
+ *			Don't use indirects on the Promise (breaks)
+ *			Heavily chop down the queue depths
+ *		Deepak Saxena:
+ *			Independent queues per IOP
+ *			Support for dynamic device creation/deletion
+ *			Code cleanup
+ *	    		Support for larger I/Os through merge* functions
+ *			(taken from DAC960 driver)
+ *		Boji T Kannanthanam:
+ *			Set the I2O Block devices to be detected in increasing
+ *			order of TIDs during boot.
+ *			Search and set the I2O block device that we boot off
+ *			from as the first device to be claimed (as /dev/i2o/hda)
+ *			Properly attach/detach I2O gendisk structure from the
+ *			system gendisk list. The I2O block devices now appear in
+ *			/proc/partitions.
+ *		Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *			Minor bugfixes for 2.6.
+ */
+
+#include <linux/module.h>
+#include <linux/i2o.h>
+
+#include <linux/mempool.h>
+
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+
+#include "i2o_block.h"
+
+#define OSM_NAME	"block-osm"
+#define OSM_VERSION	"$Rev$"
+#define OSM_DESCRIPTION	"I2O Block Device OSM"
+
+static struct i2o_driver i2o_block_driver;
+
+/* global Block OSM request mempool */
+static struct i2o_block_mempool i2o_blk_req_pool;
+
+/* Block OSM class handling definition */
+static struct i2o_class_id i2o_block_class_id[] = {
+	{I2O_CLASS_RANDOM_BLOCK_STORAGE},
+	{I2O_CLASS_END}
+};
+
+/**
+ *	i2o_block_device_free - free the memory of the I2O Block device
+ *	@dev: I2O Block device, which should be cleaned up
+ *
+ *	Frees the request queue, gendisk and the i2o_block_device structure.
+ */
+static void i2o_block_device_free(struct i2o_block_device *dev)
+{
+	blk_cleanup_queue(dev->gd->queue);
+
+	put_disk(dev->gd);
+
+	kfree(dev);
+};
+
+/**
+ *	i2o_block_remove - remove the I2O Block device from the system again
+ *	@dev: I2O Block device which should be removed
+ *
+ *	Remove gendisk from system and free all allocated memory.
+ *
+ *	Always returns 0.
+ */
+static int i2o_block_remove(struct device *dev)
+{
+	struct i2o_device *i2o_dev = to_i2o_device(dev);
+	struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev);
+
+	osm_info("Device removed %s\n", i2o_blk_dev->gd->disk_name);
+
+	i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0);
+
+	del_gendisk(i2o_blk_dev->gd);
+
+	dev_set_drvdata(dev, NULL);
+
+	i2o_device_claim_release(i2o_dev);
+
+	i2o_block_device_free(i2o_blk_dev);
+
+	return 0;
+};
+
+/**
+ *	i2o_block_device flush - Flush all dirty data of I2O device dev
+ *	@dev: I2O device which should be flushed
+ *
+ *	Flushes all dirty data on device dev.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_flush(struct i2o_device *dev)
+{
+	struct i2o_message __iomem *msg;
+	u32 m;
+
+	m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return -ETIMEDOUT;
+
+	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+	writel(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->lct_data.tid,
+	       &msg->u.head[1]);
+	writel(60 << 16, &msg->body[0]);
+	osm_debug("Flushing...\n");
+
+	return i2o_msg_post_wait(dev->iop, m, 60);
+};
+
+/**
+ *	i2o_block_device_mount - Mount (load) the media of device dev
+ *	@dev: I2O device which should receive the mount request
+ *	@media_id: Media Identifier
+ *
+ *	Load a media into drive. Identifier should be set to -1, because the
+ *	spec does not support any other value.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id)
+{
+	struct i2o_message __iomem *msg;
+	u32 m;
+
+	m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return -ETIMEDOUT;
+
+	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+	writel(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->lct_data.tid,
+	       &msg->u.head[1]);
+	writel(-1, &msg->body[0]);
+	writel(0, &msg->body[1]);
+	osm_debug("Mounting...\n");
+
+	return i2o_msg_post_wait(dev->iop, m, 2);
+};
+
+/**
+ *	i2o_block_device_lock - Locks the media of device dev
+ *	@dev: I2O device which should receive the lock request
+ *	@media_id: Media Identifier
+ *
+ *	Lock media of device dev to prevent removal. The media identifier
+ *	should be set to -1, because the spec does not support any other value.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id)
+{
+	struct i2o_message __iomem *msg;
+	u32 m;
+
+	m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return -ETIMEDOUT;
+
+	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+	writel(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid,
+	       &msg->u.head[1]);
+	writel(-1, &msg->body[0]);
+	osm_debug("Locking...\n");
+
+	return i2o_msg_post_wait(dev->iop, m, 2);
+};
+
+/**
+ *	i2o_block_device_unlock - Unlocks the media of device dev
+ *	@dev: I2O device which should receive the unlocked request
+ *	@media_id: Media Identifier
+ *
+ *	Unlocks the media in device dev. The media identifier should be set to
+ *	-1, because the spec does not support any other value.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id)
+{
+	struct i2o_message __iomem *msg;
+	u32 m;
+
+	m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return -ETIMEDOUT;
+
+	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+	writel(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid,
+	       &msg->u.head[1]);
+	writel(media_id, &msg->body[0]);
+	osm_debug("Unlocking...\n");
+
+	return i2o_msg_post_wait(dev->iop, m, 2);
+};
+
+/**
+ *	i2o_block_device_power - Power management for device dev
+ *	@dev: I2O device which should receive the power management request
+ *	@operation: Operation which should be send
+ *
+ *	Send a power management request to the device dev.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_power(struct i2o_block_device *dev, u8 op)
+{
+	struct i2o_device *i2o_dev = dev->i2o_dev;
+	struct i2o_controller *c = i2o_dev->iop;
+	struct i2o_message __iomem *msg;
+	u32 m;
+	int rc;
+
+	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
+	if (m == I2O_QUEUE_EMPTY)
+		return -ETIMEDOUT;
+
+	writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+	writel(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->lct_data.
+	       tid, &msg->u.head[1]);
+	writel(op << 24, &msg->body[0]);
+	osm_debug("Power...\n");
+
+	rc = i2o_msg_post_wait(c, m, 60);
+	if (!rc)
+		dev->power = op;
+
+	return rc;
+};
+
+/**
+ *	i2o_block_request_alloc - Allocate an I2O block request struct
+ *
+ *	Allocates an I2O block request struct and initialize the list.
+ *
+ *	Returns a i2o_block_request pointer on success or negative error code
+ *	on failure.
+ */
+static inline struct i2o_block_request *i2o_block_request_alloc(void)
+{
+	struct i2o_block_request *ireq;
+
+	ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC);
+	if (!ireq)
+		return ERR_PTR(-ENOMEM);
+
+	INIT_LIST_HEAD(&ireq->queue);
+
+	return ireq;
+};
+
+/**
+ *	i2o_block_request_free - Frees a I2O block request
+ *	@ireq: I2O block request which should be freed
+ *
+ *	Fres the allocated memory (give it back to the request mempool).
+ */
+static inline void i2o_block_request_free(struct i2o_block_request *ireq)
+{
+	mempool_free(ireq, i2o_blk_req_pool.pool);
+};
+
+/**
+ *	i2o_block_sglist_alloc - Allocate the SG list and map it
+ *	@ireq: I2O block request
+ *
+ *	Builds the SG list and map it into to be accessable by the controller.
+ *
+ *	Returns the number of elements in the SG list or 0 on failure.
+ */
+static inline int i2o_block_sglist_alloc(struct i2o_block_request *ireq)
+{
+	struct device *dev = &ireq->i2o_blk_dev->i2o_dev->iop->pdev->dev;
+	int nents;
+
+	nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table);
+
+	if (rq_data_dir(ireq->req) == READ)
+		ireq->sg_dma_direction = PCI_DMA_FROMDEVICE;
+	else
+		ireq->sg_dma_direction = PCI_DMA_TODEVICE;
+
+	ireq->sg_nents = dma_map_sg(dev, ireq->sg_table, nents,
+				    ireq->sg_dma_direction);
+
+	return ireq->sg_nents;
+};
+
+/**
+ *	i2o_block_sglist_free - Frees the SG list
+ *	@ireq: I2O block request from which the SG should be freed
+ *
+ *	Frees the SG list from the I2O block request.
+ */
+static inline void i2o_block_sglist_free(struct i2o_block_request *ireq)
+{
+	struct device *dev = &ireq->i2o_blk_dev->i2o_dev->iop->pdev->dev;
+
+	dma_unmap_sg(dev, ireq->sg_table, ireq->sg_nents,
+		     ireq->sg_dma_direction);
+};
+
+/**
+ *	i2o_block_prep_req_fn - Allocates I2O block device specific struct
+ *	@q: request queue for the request
+ *	@req: the request to prepare
+ *
+ *	Allocate the necessary i2o_block_request struct and connect it to
+ *	the request. This is needed that we not loose the SG list later on.
+ *
+ *	Returns BLKPREP_OK on success or BLKPREP_DEFER on failure.
+ */
+static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req)
+{
+	struct i2o_block_device *i2o_blk_dev = q->queuedata;
+	struct i2o_block_request *ireq;
+
+	/* request is already processed by us, so return */
+	if (req->flags & REQ_SPECIAL) {
+		osm_debug("REQ_SPECIAL already set!\n");
+		req->flags |= REQ_DONTPREP;
+		return BLKPREP_OK;
+	}
+
+	/* connect the i2o_block_request to the request */
+	if (!req->special) {
+		ireq = i2o_block_request_alloc();
+		if (unlikely(IS_ERR(ireq))) {
+			osm_debug("unable to allocate i2o_block_request!\n");
+			return BLKPREP_DEFER;
+		}
+
+		ireq->i2o_blk_dev = i2o_blk_dev;
+		req->special = ireq;
+		ireq->req = req;
+	} else
+		ireq = req->special;
+
+	/* do not come back here */
+	req->flags |= REQ_DONTPREP | REQ_SPECIAL;
+
+	return BLKPREP_OK;
+};
+
+/**
+ *	i2o_block_delayed_request_fn - delayed request queue function
+ *	delayed_request: the delayed request with the queue to start
+ *
+ *	If the request queue is stopped for a disk, and there is no open
+ *	request, a new event is created, which calls this function to start
+ *	the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never
+ *	be started again.
+ */
+static void i2o_block_delayed_request_fn(void *delayed_request)
+{
+	struct i2o_block_delayed_request *dreq = delayed_request;
+	struct request_queue *q = dreq->queue;
+	unsigned long flags;
+
+	spin_lock_irqsave(q->queue_lock, flags);
+	blk_start_queue(q);
+	spin_unlock_irqrestore(q->queue_lock, flags);
+	kfree(dreq);
+};
+
+/**
+ *	i2o_block_reply - Block OSM reply handler.
+ *	@c: I2O controller from which the message arrives
+ *	@m: message id of reply
+ *	qmsg: the actuall I2O message reply
+ *
+ *	This function gets all the message replies.
+ *
+ */
+static int i2o_block_reply(struct i2o_controller *c, u32 m,
+			   struct i2o_message *msg)
+{
+	struct i2o_block_request *ireq;
+	struct request *req;
+	struct i2o_block_device *dev;
+	struct request_queue *q;
+	u8 st;
+	unsigned long flags;
+
+	/* FAILed message */
+	if (unlikely(le32_to_cpu(msg->u.head[0]) & (1 << 13))) {
+		struct i2o_message *pmsg;
+		u32 pm;
+
+		/*
+		 * FAILed message from controller
+		 * We increment the error count and abort it
+		 *
+		 * In theory this will never happen.  The I2O block class
+		 * specification states that block devices never return
+		 * FAILs but instead use the REQ status field...but
+		 * better be on the safe side since no one really follows
+		 * the spec to the book :)
+		 */
+		pm = le32_to_cpu(msg->body[3]);
+		pmsg = i2o_msg_in_to_virt(c, pm);
+
+		req = i2o_cntxt_list_get(c, le32_to_cpu(pmsg->u.s.tcntxt));
+		if (unlikely(!req)) {
+			osm_err("NULL reply received!\n");
+			return -1;
+		}
+
+		ireq = req->special;
+		dev = ireq->i2o_blk_dev;
+		q = dev->gd->queue;
+
+		req->errors++;
+
+		spin_lock_irqsave(q->queue_lock, flags);
+
+		while (end_that_request_chunk(req, !req->errors,
+					      le32_to_cpu(pmsg->body[1]))) ;
+		end_that_request_last(req);
+
+		dev->open_queue_depth--;
+		list_del(&ireq->queue);
+		blk_start_queue(q);
+
+		spin_unlock_irqrestore(q->queue_lock, flags);
+
+		/* Now flush the message by making it a NOP */
+		i2o_msg_nop(c, pm);
+
+		return -1;
+	}
+
+	req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
+	if (unlikely(!req)) {
+		osm_err("NULL reply received!\n");
+		return -1;
+	}
+
+	ireq = req->special;
+	dev = ireq->i2o_blk_dev;
+	q = dev->gd->queue;
+
+	if (unlikely(!dev->i2o_dev)) {
+		/*
+		 * This is HACK, but Intel Integrated RAID allows user
+		 * to delete a volume that is claimed, locked, and in use
+		 * by the OS. We have to check for a reply from a
+		 * non-existent device and flag it as an error or the system
+		 * goes kaput...
+		 */
+		req->errors++;
+		osm_warn("Data transfer to deleted device!\n");
+		spin_lock_irqsave(q->queue_lock, flags);
+		while (end_that_request_chunk
+		       (req, !req->errors, le32_to_cpu(msg->body[1]))) ;
+		end_that_request_last(req);
+
+		dev->open_queue_depth--;
+		list_del(&ireq->queue);
+		blk_start_queue(q);
+
+		spin_unlock_irqrestore(q->queue_lock, flags);
+		return -1;
+	}
+
+	/*
+	 *      Lets see what is cooking. We stuffed the
+	 *      request in the context.
+	 */
+
+	st = le32_to_cpu(msg->body[0]) >> 24;
+
+	if (st != 0) {
+		int err;
+		char *bsa_errors[] = {
+			"Success",
+			"Media Error",
+			"Failure communicating to device",
+			"Device Failure",
+			"Device is not ready",
+			"Media not present",
+			"Media is locked by another user",
+			"Media has failed",
+			"Failure communicating to device",
+			"Device bus failure",
+			"Device is locked by another user",
+			"Device is write protected",
+			"Device has reset",
+			"Volume has changed, waiting for acknowledgement"
+		};
+
+		err = le32_to_cpu(msg->body[0]) & 0xffff;
+
+		/*
+		 *      Device not ready means two things. One is that the
+		 *      the thing went offline (but not a removal media)
+		 *
+		 *      The second is that you have a SuperTrak 100 and the
+		 *      firmware got constipated. Unlike standard i2o card
+		 *      setups the supertrak returns an error rather than
+		 *      blocking for the timeout in these cases.
+		 *
+		 *      Don't stick a supertrak100 into cache aggressive modes
+		 */
+
+		osm_err("block-osm: /dev/%s error: %s", dev->gd->disk_name,
+			bsa_errors[le32_to_cpu(msg->body[0]) & 0xffff]);
+		if (le32_to_cpu(msg->body[0]) & 0x00ff0000)
+			printk(KERN_ERR " - DDM attempted %d retries",
+			       (le32_to_cpu(msg->body[0]) >> 16) & 0x00ff);
+		printk(KERN_ERR ".\n");
+		req->errors++;
+	} else
+		req->errors = 0;
+
+	if (!end_that_request_chunk
+	    (req, !req->errors, le32_to_cpu(msg->body[1]))) {
+		add_disk_randomness(req->rq_disk);
+		spin_lock_irqsave(q->queue_lock, flags);
+
+		end_that_request_last(req);
+
+		dev->open_queue_depth--;
+		list_del(&ireq->queue);
+		blk_start_queue(q);
+
+		spin_unlock_irqrestore(q->queue_lock, flags);
+
+		i2o_block_sglist_free(ireq);
+		i2o_block_request_free(ireq);
+	} else
+		osm_err("still remaining chunks\n");
+
+	return 1;
+};
+
+static void i2o_block_event(struct i2o_event *evt)
+{
+	osm_info("block-osm: event received\n");
+};
+
+/*
+ *	SCSI-CAM for ioctl geometry mapping
+ *	Duplicated with SCSI - this should be moved into somewhere common
+ *	perhaps genhd ?
+ *
+ * LBA -> CHS mapping table taken from:
+ *
+ * "Incorporating the I2O Architecture into BIOS for Intel Architecture
+ *  Platforms"
+ *
+ * This is an I2O document that is only available to I2O members,
+ * not developers.
+ *
+ * From my understanding, this is how all the I2O cards do this
+ *
+ * Disk Size      | Sectors | Heads | Cylinders
+ * ---------------+---------+-------+-------------------
+ * 1 < X <= 528M  | 63      | 16    | X/(63 * 16 * 512)
+ * 528M < X <= 1G | 63      | 32    | X/(63 * 32 * 512)
+ * 1 < X <528M    | 63      | 16    | X/(63 * 16 * 512)
+ * 1 < X <528M    | 63      | 16    | X/(63 * 16 * 512)
+ *
+ */
+#define	BLOCK_SIZE_528M		1081344
+#define	BLOCK_SIZE_1G		2097152
+#define	BLOCK_SIZE_21G		4403200
+#define	BLOCK_SIZE_42G		8806400
+#define	BLOCK_SIZE_84G		17612800
+
+static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls,
+				unsigned char *hds, unsigned char *secs)
+{
+	unsigned long heads, sectors, cylinders;
+
+	sectors = 63L;		/* Maximize sectors per track */
+	if (capacity <= BLOCK_SIZE_528M)
+		heads = 16;
+	else if (capacity <= BLOCK_SIZE_1G)
+		heads = 32;
+	else if (capacity <= BLOCK_SIZE_21G)
+		heads = 64;
+	else if (capacity <= BLOCK_SIZE_42G)
+		heads = 128;
+	else
+		heads = 255;
+
+	cylinders = (unsigned long)capacity / (heads * sectors);
+
+	*cyls = (unsigned short)cylinders;	/* Stuff return values */
+	*secs = (unsigned char)sectors;
+	*hds = (unsigned char)heads;
+}
+
+/**
+ *	i2o_block_open - Open the block device
+ *
+ *	Power up the device, mount and lock the media. This function is called,
+ *	if the block device is opened for access.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_open(struct inode *inode, struct file *file)
+{
+	struct i2o_block_device *dev = inode->i_bdev->bd_disk->private_data;
+
+	if (!dev->i2o_dev)
+		return -ENODEV;
+
+	if (dev->power > 0x1f)
+		i2o_block_device_power(dev, 0x02);
+
+	i2o_block_device_mount(dev->i2o_dev, -1);
+
+	i2o_block_device_lock(dev->i2o_dev, -1);
+
+	osm_debug("Ready.\n");
+
+	return 0;
+};
+
+/**
+ *	i2o_block_release - Release the I2O block device
+ *
+ *	Unlock and unmount the media, and power down the device. Gets called if
+ *	the block device is closed.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_release(struct inode *inode, struct file *file)
+{
+	struct gendisk *disk = inode->i_bdev->bd_disk;
+	struct i2o_block_device *dev = disk->private_data;
+	u8 operation;
+
+	/*
+	 * This is to deail with the case of an application
+	 * opening a device and then the device dissapears while
+	 * it's in use, and then the application tries to release
+	 * it.  ex: Unmounting a deleted RAID volume at reboot.
+	 * If we send messages, it will just cause FAILs since
+	 * the TID no longer exists.
+	 */
+	if (!dev->i2o_dev)
+		return 0;
+
+	i2o_block_device_flush(dev->i2o_dev);
+
+	i2o_block_device_unlock(dev->i2o_dev, -1);
+
+	if (dev->flags & (1 << 3 | 1 << 4))	/* Removable */
+		operation = 0x21;
+	else
+		operation = 0x24;
+
+	i2o_block_device_power(dev, operation);
+
+	return 0;
+}
+
+/**
+ *	i2o_block_ioctl - Issue device specific ioctl calls.
+ *	@cmd: ioctl command
+ *	@arg: arg
+ *
+ *	Handles ioctl request for the block device.
+ *
+ *	Return 0 on success or negative error on failure.
+ */
+static int i2o_block_ioctl(struct inode *inode, struct file *file,
+			   unsigned int cmd, unsigned long arg)
+{
+	struct gendisk *disk = inode->i_bdev->bd_disk;
+	struct i2o_block_device *dev = disk->private_data;
+	void __user *argp = (void __user *)arg;
+
+	/* Anyone capable of this syscall can do *real bad* things */
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	switch (cmd) {
+	case HDIO_GETGEO:
+		{
+			struct hd_geometry g;
+			i2o_block_biosparam(get_capacity(disk),
+					    &g.cylinders, &g.heads, &g.sectors);
+			g.start = get_start_sect(inode->i_bdev);
+			return copy_to_user(argp, &g, sizeof(g)) ? -EFAULT : 0;
+		}
+
+	case BLKI2OGRSTRAT:
+		return put_user(dev->rcache, (int __user *)arg);
+	case BLKI2OGWSTRAT:
+		return put_user(dev->wcache, (int __user *)arg);
+	case BLKI2OSRSTRAT:
+		if (arg < 0 || arg > CACHE_SMARTFETCH)
+			return -EINVAL;
+		dev->rcache = arg;
+		break;
+	case BLKI2OSWSTRAT:
+		if (arg != 0
+		    && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK))
+			return -EINVAL;
+		dev->wcache = arg;
+		break;
+	}
+	return -ENOTTY;
+};
+
+/**
+ *	i2o_block_media_changed - Have we seen a media change?
+ *	@disk: gendisk which should be verified
+ *
+ *	Verifies if the media has changed.
+ *
+ *	Returns 1 if the media was changed or 0 otherwise.
+ */
+static int i2o_block_media_changed(struct gendisk *disk)
+{
+	struct i2o_block_device *p = disk->private_data;
+
+	if (p->media_change_flag) {
+		p->media_change_flag = 0;
+		return 1;
+	}
+	return 0;
+}
+
+/**
+ *	i2o_block_transfer - Transfer a request to/from the I2O controller
+ *	@req: the request which should be transfered
+ *
+ *	This function converts the request into a I2O message. The necessary
+ *	DMA buffers are allocated and after everything is setup post the message
+ *	to the I2O controller. No cleanup is done by this function. It is done
+ *	on the interrupt side when the reply arrives.
+ *
+ *	Return 0 on success or negative error code on failure.
+ */
+static int i2o_block_transfer(struct request *req)
+{
+	struct i2o_block_device *dev = req->rq_disk->private_data;
+	struct i2o_controller *c = dev->i2o_dev->iop;
+	int tid = dev->i2o_dev->lct_data.tid;
+	struct i2o_message __iomem *msg;
+	void __iomem *mptr;
+	struct i2o_block_request *ireq = req->special;
+	struct scatterlist *sg;
+	int sgnum;
+	int i;
+	u32 m;
+	u32 tcntxt;
+	u32 sg_flags;
+	int rc;
+
+	m = i2o_msg_get(c, &msg);
+	if (m == I2O_QUEUE_EMPTY) {
+		rc = -EBUSY;
+		goto exit;
+	}
+
+	tcntxt = i2o_cntxt_list_add(c, req);
+	if (!tcntxt) {
+		rc = -ENOMEM;
+		goto nop_msg;
+	}
+
+	if ((sgnum = i2o_block_sglist_alloc(ireq)) <= 0) {
+		rc = -ENOMEM;
+		goto context_remove;
+	}
+
+	/* Build the message based on the request. */
+	writel(i2o_block_driver.context, &msg->u.s.icntxt);
+	writel(tcntxt, &msg->u.s.tcntxt);
+	writel(req->nr_sectors << 9, &msg->body[1]);
+
+	writel((((u64) req->sector) << 9) & 0xffffffff, &msg->body[2]);
+	writel(req->sector >> 23, &msg->body[3]);
+
+	mptr = &msg->body[4];
+
+	sg = ireq->sg_table;
+
+	if (rq_data_dir(req) == READ) {
+		writel(I2O_CMD_BLOCK_READ << 24 | HOST_TID << 12 | tid,
+		       &msg->u.head[1]);
+		sg_flags = 0x10000000;
+		switch (dev->rcache) {
+		case CACHE_NULL:
+			writel(0, &msg->body[0]);
+			break;
+		case CACHE_PREFETCH:
+			writel(0x201F0008, &msg->body[0]);
+			break;
+		case CACHE_SMARTFETCH:
+			if (req->nr_sectors > 16)
+				writel(0x201F0008, &msg->body[0]);
+			else
+				writel(0x001F0000, &msg->body[0]);
+			break;
+		}
+	} else {
+		writel(I2O_CMD_BLOCK_WRITE << 24 | HOST_TID << 12 | tid,
+		       &msg->u.head[1]);
+		sg_flags = 0x14000000;
+		switch (dev->wcache) {
+		case CACHE_NULL:
+			writel(0, &msg->body[0]);
+			break;
+		case CACHE_WRITETHROUGH:
+			writel(0x001F0008, &msg->body[0]);
+			break;
+		case CACHE_WRITEBACK:
+			writel(0x001F0010, &msg->body[0]);
+			break;
+		case CACHE_SMARTBACK:
+			if (req->nr_sectors > 16)
+				writel(0x001F0004, &msg->body[0]);
+			else
+				writel(0x001F0010, &msg->body[0]);
+			break;
+		case CACHE_SMARTTHROUGH:
+			if (req->nr_sectors > 16)
+				writel(0x001F0004, &msg->body[0]);
+			else
+				writel(0x001F0010, &msg->body[0]);
+		}
+	}
+
+	for (i = sgnum; i > 0; i--) {
+		if (i == 1)
+			sg_flags |= 0x80000000;
+		writel(sg_flags | sg_dma_len(sg), mptr);
+		writel(sg_dma_address(sg), mptr + 4);
+		mptr += 8;
+		sg++;
+	}
+
+	writel(I2O_MESSAGE_SIZE
+	       (((unsigned long)mptr -
+		 (unsigned long)&msg->u.head[0]) >> 2) | SGL_OFFSET_8,
+	       &msg->u.head[0]);
+
+	list_add_tail(&ireq->queue, &dev->open_queue);
+	dev->open_queue_depth++;
+
+	i2o_msg_post(c, m);
+
+	return 0;
+
+      context_remove:
+	i2o_cntxt_list_remove(c, req);
+
+      nop_msg:
+	i2o_msg_nop(c, m);
+
+      exit:
+	return rc;
+};
+
+/**
+ *	i2o_block_request_fn - request queue handling function
+ *	q: request queue from which the request could be fetched
+ *
+ *	Takes the next request from the queue, transfers it and if no error
+ *	occurs dequeue it from the queue. On arrival of the reply the message
+ *	will be processed further. If an error occurs requeue the request.
+ */
+static void i2o_block_request_fn(struct request_queue *q)
+{
+	struct request *req;
+
+	while (!blk_queue_plugged(q)) {
+		req = elv_next_request(q);
+		if (!req)
+			break;
+
+		if (blk_fs_request(req)) {
+			struct i2o_block_delayed_request *dreq;
+			struct i2o_block_request *ireq = req->special;
+			unsigned int queue_depth;
+
+			queue_depth = ireq->i2o_blk_dev->open_queue_depth;
+
+			if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS)
+				if (!i2o_block_transfer(req)) {
+					blkdev_dequeue_request(req);
+					continue;
+				}
+
+			if (queue_depth)
+				break;
+
+			/* stop the queue and retry later */
+			dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC);
+			if (!dreq)
+				continue;
+
+			dreq->queue = q;
+			INIT_WORK(&dreq->work, i2o_block_delayed_request_fn,
+				  dreq);
+
+			osm_info("transfer error\n");
+			if (!queue_delayed_work(i2o_block_driver.event_queue,
+						&dreq->work,
+						I2O_BLOCK_RETRY_TIME))
+				kfree(dreq);
+			else {
+				blk_stop_queue(q);
+				break;
+			}
+		} else
+			end_request(req, 0);
+	}
+};
+
+/* I2O Block device operations definition */
+static struct block_device_operations i2o_block_fops = {
+	.owner = THIS_MODULE,
+	.open = i2o_block_open,
+	.release = i2o_block_release,
+	.ioctl = i2o_block_ioctl,
+	.media_changed = i2o_block_media_changed
+};
+
+/**
+ *	i2o_block_device_alloc - Allocate memory for a I2O Block device
+ *
+ *	Allocate memory for the i2o_block_device struct, gendisk and request
+ *	queue and initialize them as far as no additional information is needed.
+ *
+ *	Returns a pointer to the allocated I2O Block device on succes or a
+ *	negative error code on failure.
+ */
+static struct i2o_block_device *i2o_block_device_alloc(void)
+{
+	struct i2o_block_device *dev;
+	struct gendisk *gd;
+	struct request_queue *queue;
+	int rc;
+
+	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev) {
+		osm_err("Insufficient memory to allocate I2O Block disk.\n");
+		rc = -ENOMEM;
+		goto exit;
+	}
+	memset(dev, 0, sizeof(*dev));
+
+	INIT_LIST_HEAD(&dev->open_queue);
+	spin_lock_init(&dev->lock);
+	dev->rcache = CACHE_PREFETCH;
+	dev->wcache = CACHE_WRITEBACK;
+
+	/* allocate a gendisk with 16 partitions */
+	gd = alloc_disk(16);
+	if (!gd) {
+		osm_err("Insufficient memory to allocate gendisk.\n");
+		rc = -ENOMEM;
+		goto cleanup_dev;
+	}
+
+	/* initialize the request queue */
+	queue = blk_init_queue(i2o_block_request_fn, &dev->lock);
+	if (!queue) {
+		osm_err("Insufficient memory to allocate request queue.\n");
+		rc = -ENOMEM;
+		goto cleanup_queue;
+	}
+
+	blk_queue_prep_rq(queue, i2o_block_prep_req_fn);
+
+	gd->major = I2O_MAJOR;
+	gd->queue = queue;
+	gd->fops = &i2o_block_fops;
+	gd->private_data = dev;
+
+	dev->gd = gd;
+
+	return dev;
+
+      cleanup_queue:
+	put_disk(gd);
+
+      cleanup_dev:
+	kfree(dev);
+
+      exit:
+	return ERR_PTR(rc);
+};
+
+/**
+ *	i2o_block_probe - verify if dev is a I2O Block device and install it
+ *	@dev: device to verify if it is a I2O Block device
+ *
+ *	We only verify if the user_tid of the device is 0xfff and then install
+ *	the device. Otherwise it is used by some other device (e. g. RAID).
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_probe(struct device *dev)
+{
+	struct i2o_device *i2o_dev = to_i2o_device(dev);
+	struct i2o_block_device *i2o_blk_dev;
+	struct i2o_controller *c = i2o_dev->iop;
+	struct gendisk *gd;
+	struct request_queue *queue;
+	static int unit = 0;
+	int rc;
+	u64 size;
+	u32 blocksize;
+	u16 power;
+	u32 flags, status;
+	int segments;
+
+	/* skip devices which are used by IOP */
+	if (i2o_dev->lct_data.user_tid != 0xfff) {
+		osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid);
+		return -ENODEV;
+	}
+
+	osm_info("New device detected (TID: %03x)\n", i2o_dev->lct_data.tid);
+
+	if (i2o_device_claim(i2o_dev)) {
+		osm_warn("Unable to claim device. Installation aborted\n");
+		rc = -EFAULT;
+		goto exit;
+	}
+
+	i2o_blk_dev = i2o_block_device_alloc();
+	if (IS_ERR(i2o_blk_dev)) {
+		osm_err("could not alloc a new I2O block device");
+		rc = PTR_ERR(i2o_blk_dev);
+		goto claim_release;
+	}
+
+	i2o_blk_dev->i2o_dev = i2o_dev;
+	dev_set_drvdata(dev, i2o_blk_dev);
+
+	/* setup gendisk */
+	gd = i2o_blk_dev->gd;
+	gd->first_minor = unit << 4;
+	sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit);
+	sprintf(gd->devfs_name, "i2o/hd%c", 'a' + unit);
+	gd->driverfs_dev = &i2o_dev->device;
+
+	/* setup request queue */
+	queue = gd->queue;
+	queue->queuedata = i2o_blk_dev;
+
+	blk_queue_max_phys_segments(queue, I2O_MAX_SEGMENTS);
+	blk_queue_max_sectors(queue, I2O_MAX_SECTORS);
+
+	if (c->short_req)
+		segments = 8;
+	else {
+		i2o_status_block *sb;
+
+		sb = c->status_block.virt;
+
+		segments = (sb->inbound_frame_size -
+			    sizeof(struct i2o_message) / 4 - 4) / 2;
+	}
+
+	blk_queue_max_hw_segments(queue, segments);
+
+	osm_debug("max sectors = %d\n", I2O_MAX_SECTORS);
+	osm_debug("phys segments = %d\n", I2O_MAX_SEGMENTS);
+	osm_debug("hw segments = %d\n", segments);
+
+	/*
+	 *      Ask for the current media data. If that isn't supported
+	 *      then we ask for the device capacity data
+	 */
+	if (i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) != 0
+	    || i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) != 0) {
+		i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4);
+		i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8);
+	}
+	osm_debug("blocksize = %d\n", blocksize);
+
+	if (i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2))
+		power = 0;
+	i2o_parm_field_get(i2o_dev, 0x0000, 5, &flags, 4);
+	i2o_parm_field_get(i2o_dev, 0x0000, 6, &status, 4);
+
+	set_capacity(gd, size >> 9);
+
+	i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff);
+
+	add_disk(gd);
+
+	unit++;
+
+	return 0;
+
+      claim_release:
+	i2o_device_claim_release(i2o_dev);
+
+      exit:
+	return rc;
+};
+
+/* Block OSM driver struct */
+static struct i2o_driver i2o_block_driver = {
+	.name = OSM_NAME,
+	.event = i2o_block_event,
+	.reply = i2o_block_reply,
+	.classes = i2o_block_class_id,
+	.driver = {
+		   .probe = i2o_block_probe,
+		   .remove = i2o_block_remove,
+		   },
+};
+
+/**
+ *	i2o_block_init - Block OSM initialization function
+ *
+ *	Allocate the slab and mempool for request structs, registers i2o_block
+ *	block device and finally register the Block OSM in the I2O core.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int __init i2o_block_init(void)
+{
+	int rc;
+	int size;
+
+	printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
+
+	/* Allocate request mempool and slab */
+	size = sizeof(struct i2o_block_request);
+	i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0,
+						  SLAB_HWCACHE_ALIGN, NULL,
+						  NULL);
+	if (!i2o_blk_req_pool.slab) {
+		osm_err("can't init request slab\n");
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	i2o_blk_req_pool.pool = mempool_create(I2O_REQ_MEMPOOL_SIZE,
+					       mempool_alloc_slab,
+					       mempool_free_slab,
+					       i2o_blk_req_pool.slab);
+	if (!i2o_blk_req_pool.pool) {
+		osm_err("can't init request mempool\n");
+		rc = -ENOMEM;
+		goto free_slab;
+	}
+
+	/* Register the block device interfaces */
+	rc = register_blkdev(I2O_MAJOR, "i2o_block");
+	if (rc) {
+		osm_err("unable to register block device\n");
+		goto free_mempool;
+	}
+#ifdef MODULE
+	osm_info("registered device at major %d\n", I2O_MAJOR);
+#endif
+
+	/* Register Block OSM into I2O core */
+	rc = i2o_driver_register(&i2o_block_driver);
+	if (rc) {
+		osm_err("Could not register Block driver\n");
+		goto unregister_blkdev;
+	}
+
+	return 0;
+
+      unregister_blkdev:
+	unregister_blkdev(I2O_MAJOR, "i2o_block");
+
+      free_mempool:
+	mempool_destroy(i2o_blk_req_pool.pool);
+
+      free_slab:
+	kmem_cache_destroy(i2o_blk_req_pool.slab);
+
+      exit:
+	return rc;
+};
+
+/**
+ *	i2o_block_exit - Block OSM exit function
+ *
+ *	Unregisters Block OSM from I2O core, unregisters i2o_block block device
+ *	and frees the mempool and slab.
+ */
+static void __exit i2o_block_exit(void)
+{
+	/* Unregister I2O Block OSM from I2O core */
+	i2o_driver_unregister(&i2o_block_driver);
+
+	/* Unregister block device */
+	unregister_blkdev(I2O_MAJOR, "i2o_block");
+
+	/* Free request mempool and slab */
+	mempool_destroy(i2o_blk_req_pool.pool);
+	kmem_cache_destroy(i2o_blk_req_pool.slab);
+};
+
+MODULE_AUTHOR("Red Hat");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(OSM_DESCRIPTION);
+MODULE_VERSION(OSM_VERSION);
+
+module_init(i2o_block_init);
+module_exit(i2o_block_exit);