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!
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);