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-rw-r--r--drivers/block/viodasd.c814
1 files changed, 814 insertions, 0 deletions
diff --git a/drivers/block/viodasd.c b/drivers/block/viodasd.c
new file mode 100644
index 0000000..ecccf65
--- /dev/null
+++ b/drivers/block/viodasd.c
@@ -0,0 +1,814 @@
+/* -*- linux-c -*-
+ * viodasd.c
+ * Authors: Dave Boutcher <boutcher@us.ibm.com>
+ * Ryan Arnold <ryanarn@us.ibm.com>
+ * Colin Devilbiss <devilbis@us.ibm.com>
+ * Stephen Rothwell
+ *
+ * (C) Copyright 2000-2004 IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * This routine provides access to disk space (termed "DASD" in historical
+ * IBM terms) owned and managed by an OS/400 partition running on the
+ * same box as this Linux partition.
+ *
+ * All disk operations are performed by sending messages back and forth to
+ * the OS/400 partition.
+ */
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/scatterlist.h>
+
+#include <asm/uaccess.h>
+#include <asm/vio.h>
+#include <asm/iseries/hv_types.h>
+#include <asm/iseries/hv_lp_event.h>
+#include <asm/iseries/hv_lp_config.h>
+#include <asm/iseries/vio.h>
+#include <asm/firmware.h>
+
+MODULE_DESCRIPTION("iSeries Virtual DASD");
+MODULE_AUTHOR("Dave Boutcher");
+MODULE_LICENSE("GPL");
+
+/*
+ * We only support 7 partitions per physical disk....so with minor
+ * numbers 0-255 we get a maximum of 32 disks.
+ */
+#define VIOD_GENHD_NAME "iseries/vd"
+
+#define VIOD_VERS "1.64"
+
+#define VIOD_KERN_WARNING KERN_WARNING "viod: "
+#define VIOD_KERN_INFO KERN_INFO "viod: "
+
+enum {
+ PARTITION_SHIFT = 3,
+ MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS,
+ MAX_DISK_NAME = FIELD_SIZEOF(struct gendisk, disk_name)
+};
+
+static DEFINE_SPINLOCK(viodasd_spinlock);
+
+#define VIOMAXREQ 16
+
+#define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
+
+struct viodasd_waitevent {
+ struct completion com;
+ int rc;
+ u16 sub_result;
+ int max_disk; /* open */
+};
+
+static const struct vio_error_entry viodasd_err_table[] = {
+ { 0x0201, EINVAL, "Invalid Range" },
+ { 0x0202, EINVAL, "Invalid Token" },
+ { 0x0203, EIO, "DMA Error" },
+ { 0x0204, EIO, "Use Error" },
+ { 0x0205, EIO, "Release Error" },
+ { 0x0206, EINVAL, "Invalid Disk" },
+ { 0x0207, EBUSY, "Cant Lock" },
+ { 0x0208, EIO, "Already Locked" },
+ { 0x0209, EIO, "Already Unlocked" },
+ { 0x020A, EIO, "Invalid Arg" },
+ { 0x020B, EIO, "Bad IFS File" },
+ { 0x020C, EROFS, "Read Only Device" },
+ { 0x02FF, EIO, "Internal Error" },
+ { 0x0000, 0, NULL },
+};
+
+/*
+ * Figure out the biggest I/O request (in sectors) we can accept
+ */
+#define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA)
+
+/*
+ * Number of disk I/O requests we've sent to OS/400
+ */
+static int num_req_outstanding;
+
+/*
+ * This is our internal structure for keeping track of disk devices
+ */
+struct viodasd_device {
+ u16 cylinders;
+ u16 tracks;
+ u16 sectors;
+ u16 bytes_per_sector;
+ u64 size;
+ int read_only;
+ spinlock_t q_lock;
+ struct gendisk *disk;
+ struct device *dev;
+} viodasd_devices[MAX_DISKNO];
+
+/*
+ * External open entry point.
+ */
+static int viodasd_open(struct block_device *bdev, fmode_t mode)
+{
+ struct viodasd_device *d = bdev->bd_disk->private_data;
+ HvLpEvent_Rc hvrc;
+ struct viodasd_waitevent we;
+ u16 flags = 0;
+
+ if (d->read_only) {
+ if (mode & FMODE_WRITE)
+ return -EROFS;
+ flags = vioblockflags_ro;
+ }
+
+ init_completion(&we.com);
+
+ /* Send the open event to OS/400 */
+ hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
+ HvLpEvent_Type_VirtualIo,
+ viomajorsubtype_blockio | vioblockopen,
+ HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
+ viopath_sourceinst(viopath_hostLp),
+ viopath_targetinst(viopath_hostLp),
+ (u64)(unsigned long)&we, VIOVERSION << 16,
+ ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32),
+ 0, 0, 0);
+ if (hvrc != 0) {
+ printk(VIOD_KERN_WARNING "HV open failed %d\n", (int)hvrc);
+ return -EIO;
+ }
+
+ wait_for_completion(&we.com);
+
+ /* Check the return code */
+ if (we.rc != 0) {
+ const struct vio_error_entry *err =
+ vio_lookup_rc(viodasd_err_table, we.sub_result);
+
+ printk(VIOD_KERN_WARNING
+ "bad rc opening disk: %d:0x%04x (%s)\n",
+ (int)we.rc, we.sub_result, err->msg);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/*
+ * External release entry point.
+ */
+static int viodasd_release(struct gendisk *disk, fmode_t mode)
+{
+ struct viodasd_device *d = disk->private_data;
+ HvLpEvent_Rc hvrc;
+
+ /* Send the event to OS/400. We DON'T expect a response */
+ hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
+ HvLpEvent_Type_VirtualIo,
+ viomajorsubtype_blockio | vioblockclose,
+ HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
+ viopath_sourceinst(viopath_hostLp),
+ viopath_targetinst(viopath_hostLp),
+ 0, VIOVERSION << 16,
+ ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */,
+ 0, 0, 0);
+ if (hvrc != 0)
+ printk(VIOD_KERN_WARNING "HV close call failed %d\n",
+ (int)hvrc);
+ return 0;
+}
+
+
+/* External ioctl entry point.
+ */
+static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct gendisk *disk = bdev->bd_disk;
+ struct viodasd_device *d = disk->private_data;
+
+ geo->sectors = d->sectors ? d->sectors : 32;
+ geo->heads = d->tracks ? d->tracks : 64;
+ geo->cylinders = d->cylinders ? d->cylinders :
+ get_capacity(disk) / (geo->sectors * geo->heads);
+
+ return 0;
+}
+
+/*
+ * Our file operations table
+ */
+static struct block_device_operations viodasd_fops = {
+ .owner = THIS_MODULE,
+ .open = viodasd_open,
+ .release = viodasd_release,
+ .getgeo = viodasd_getgeo,
+};
+
+/*
+ * End a request
+ */
+static void viodasd_end_request(struct request *req, int error,
+ int num_sectors)
+{
+ __blk_end_request(req, error, num_sectors << 9);
+}
+
+/*
+ * Send an actual I/O request to OS/400
+ */
+static int send_request(struct request *req)
+{
+ u64 start;
+ int direction;
+ int nsg;
+ u16 viocmd;
+ HvLpEvent_Rc hvrc;
+ struct vioblocklpevent *bevent;
+ struct HvLpEvent *hev;
+ struct scatterlist sg[VIOMAXBLOCKDMA];
+ int sgindex;
+ struct viodasd_device *d;
+ unsigned long flags;
+
+ start = (u64)req->sector << 9;
+
+ if (rq_data_dir(req) == READ) {
+ direction = DMA_FROM_DEVICE;
+ viocmd = viomajorsubtype_blockio | vioblockread;
+ } else {
+ direction = DMA_TO_DEVICE;
+ viocmd = viomajorsubtype_blockio | vioblockwrite;
+ }
+
+ d = req->rq_disk->private_data;
+
+ /* Now build the scatter-gather list */
+ sg_init_table(sg, VIOMAXBLOCKDMA);
+ nsg = blk_rq_map_sg(req->q, req, sg);
+ nsg = dma_map_sg(d->dev, sg, nsg, direction);
+
+ spin_lock_irqsave(&viodasd_spinlock, flags);
+ num_req_outstanding++;
+
+ /* This optimization handles a single DMA block */
+ if (nsg == 1)
+ hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
+ HvLpEvent_Type_VirtualIo, viocmd,
+ HvLpEvent_AckInd_DoAck,
+ HvLpEvent_AckType_ImmediateAck,
+ viopath_sourceinst(viopath_hostLp),
+ viopath_targetinst(viopath_hostLp),
+ (u64)(unsigned long)req, VIOVERSION << 16,
+ ((u64)DEVICE_NO(d) << 48), start,
+ ((u64)sg_dma_address(&sg[0])) << 32,
+ sg_dma_len(&sg[0]));
+ else {
+ bevent = (struct vioblocklpevent *)
+ vio_get_event_buffer(viomajorsubtype_blockio);
+ if (bevent == NULL) {
+ printk(VIOD_KERN_WARNING
+ "error allocating disk event buffer\n");
+ goto error_ret;
+ }
+
+ /*
+ * Now build up the actual request. Note that we store
+ * the pointer to the request in the correlation
+ * token so we can match the response up later
+ */
+ memset(bevent, 0, sizeof(struct vioblocklpevent));
+ hev = &bevent->event;
+ hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK |
+ HV_LP_EVENT_INT;
+ hev->xType = HvLpEvent_Type_VirtualIo;
+ hev->xSubtype = viocmd;
+ hev->xSourceLp = HvLpConfig_getLpIndex();
+ hev->xTargetLp = viopath_hostLp;
+ hev->xSizeMinus1 =
+ offsetof(struct vioblocklpevent, u.rw_data.dma_info) +
+ (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1;
+ hev->xSourceInstanceId = viopath_sourceinst(viopath_hostLp);
+ hev->xTargetInstanceId = viopath_targetinst(viopath_hostLp);
+ hev->xCorrelationToken = (u64)req;
+ bevent->version = VIOVERSION;
+ bevent->disk = DEVICE_NO(d);
+ bevent->u.rw_data.offset = start;
+
+ /*
+ * Copy just the dma information from the sg list
+ * into the request
+ */
+ for (sgindex = 0; sgindex < nsg; sgindex++) {
+ bevent->u.rw_data.dma_info[sgindex].token =
+ sg_dma_address(&sg[sgindex]);
+ bevent->u.rw_data.dma_info[sgindex].len =
+ sg_dma_len(&sg[sgindex]);
+ }
+
+ /* Send the request */
+ hvrc = HvCallEvent_signalLpEvent(&bevent->event);
+ vio_free_event_buffer(viomajorsubtype_blockio, bevent);
+ }
+
+ if (hvrc != HvLpEvent_Rc_Good) {
+ printk(VIOD_KERN_WARNING
+ "error sending disk event to OS/400 (rc %d)\n",
+ (int)hvrc);
+ goto error_ret;
+ }
+ spin_unlock_irqrestore(&viodasd_spinlock, flags);
+ return 0;
+
+error_ret:
+ num_req_outstanding--;
+ spin_unlock_irqrestore(&viodasd_spinlock, flags);
+ dma_unmap_sg(d->dev, sg, nsg, direction);
+ return -1;
+}
+
+/*
+ * This is the external request processing routine
+ */
+static void do_viodasd_request(struct request_queue *q)
+{
+ struct request *req;
+
+ /*
+ * If we already have the maximum number of requests
+ * outstanding to OS/400 just bail out. We'll come
+ * back later.
+ */
+ while (num_req_outstanding < VIOMAXREQ) {
+ req = elv_next_request(q);
+ if (req == NULL)
+ return;
+ /* dequeue the current request from the queue */
+ blkdev_dequeue_request(req);
+ /* check that request contains a valid command */
+ if (!blk_fs_request(req)) {
+ viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+ continue;
+ }
+ /* Try sending the request */
+ if (send_request(req) != 0)
+ viodasd_end_request(req, -EIO, req->hard_nr_sectors);
+ }
+}
+
+/*
+ * Probe a single disk and fill in the viodasd_device structure
+ * for it.
+ */
+static int probe_disk(struct viodasd_device *d)
+{
+ HvLpEvent_Rc hvrc;
+ struct viodasd_waitevent we;
+ int dev_no = DEVICE_NO(d);
+ struct gendisk *g;
+ struct request_queue *q;
+ u16 flags = 0;
+
+retry:
+ init_completion(&we.com);
+
+ /* Send the open event to OS/400 */
+ hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
+ HvLpEvent_Type_VirtualIo,
+ viomajorsubtype_blockio | vioblockopen,
+ HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
+ viopath_sourceinst(viopath_hostLp),
+ viopath_targetinst(viopath_hostLp),
+ (u64)(unsigned long)&we, VIOVERSION << 16,
+ ((u64)dev_no << 48) | ((u64)flags<< 32),
+ 0, 0, 0);
+ if (hvrc != 0) {
+ printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc);
+ return 0;
+ }
+
+ wait_for_completion(&we.com);
+
+ if (we.rc != 0) {
+ if (flags != 0)
+ return 0;
+ /* try again with read only flag set */
+ flags = vioblockflags_ro;
+ goto retry;
+ }
+ if (we.max_disk > (MAX_DISKNO - 1)) {
+ static int warned;
+
+ if (warned == 0) {
+ warned++;
+ printk(VIOD_KERN_INFO
+ "Only examining the first %d "
+ "of %d disks connected\n",
+ MAX_DISKNO, we.max_disk + 1);
+ }
+ }
+
+ /* Send the close event to OS/400. We DON'T expect a response */
+ hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
+ HvLpEvent_Type_VirtualIo,
+ viomajorsubtype_blockio | vioblockclose,
+ HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
+ viopath_sourceinst(viopath_hostLp),
+ viopath_targetinst(viopath_hostLp),
+ 0, VIOVERSION << 16,
+ ((u64)dev_no << 48) | ((u64)flags << 32),
+ 0, 0, 0);
+ if (hvrc != 0) {
+ printk(VIOD_KERN_WARNING
+ "bad rc sending event to OS/400 %d\n", (int)hvrc);
+ return 0;
+ }
+
+ if (d->dev == NULL) {
+ /* this is when we reprobe for new disks */
+ if (vio_create_viodasd(dev_no) == NULL) {
+ printk(VIOD_KERN_WARNING
+ "cannot allocate virtual device for disk %d\n",
+ dev_no);
+ return 0;
+ }
+ /*
+ * The vio_create_viodasd will have recursed into this
+ * routine with d->dev set to the new vio device and
+ * will finish the setup of the disk below.
+ */
+ return 1;
+ }
+
+ /* create the request queue for the disk */
+ spin_lock_init(&d->q_lock);
+ q = blk_init_queue(do_viodasd_request, &d->q_lock);
+ if (q == NULL) {
+ printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n",
+ dev_no);
+ return 0;
+ }
+ g = alloc_disk(1 << PARTITION_SHIFT);
+ if (g == NULL) {
+ printk(VIOD_KERN_WARNING
+ "cannot allocate disk structure for disk %d\n",
+ dev_no);
+ blk_cleanup_queue(q);
+ return 0;
+ }
+
+ d->disk = g;
+ blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA);
+ blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA);
+ blk_queue_max_sectors(q, VIODASD_MAXSECTORS);
+ g->major = VIODASD_MAJOR;
+ g->first_minor = dev_no << PARTITION_SHIFT;
+ if (dev_no >= 26)
+ snprintf(g->disk_name, sizeof(g->disk_name),
+ VIOD_GENHD_NAME "%c%c",
+ 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26));
+ else
+ snprintf(g->disk_name, sizeof(g->disk_name),
+ VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26));
+ g->fops = &viodasd_fops;
+ g->queue = q;
+ g->private_data = d;
+ g->driverfs_dev = d->dev;
+ set_capacity(g, d->size >> 9);
+
+ printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) "
+ "CHS=%d/%d/%d sector size %d%s\n",
+ dev_no, (unsigned long)(d->size >> 9),
+ (unsigned long)(d->size >> 20),
+ (int)d->cylinders, (int)d->tracks,
+ (int)d->sectors, (int)d->bytes_per_sector,
+ d->read_only ? " (RO)" : "");
+
+ /* register us in the global list */
+ add_disk(g);
+ return 1;
+}
+
+/* returns the total number of scatterlist elements converted */
+static int block_event_to_scatterlist(const struct vioblocklpevent *bevent,
+ struct scatterlist *sg, int *total_len)
+{
+ int i, numsg;
+ const struct rw_data *rw_data = &bevent->u.rw_data;
+ static const int offset =
+ offsetof(struct vioblocklpevent, u.rw_data.dma_info);
+ static const int element_size = sizeof(rw_data->dma_info[0]);
+
+ numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size;
+ if (numsg > VIOMAXBLOCKDMA)
+ numsg = VIOMAXBLOCKDMA;
+
+ *total_len = 0;
+ sg_init_table(sg, VIOMAXBLOCKDMA);
+ for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) {
+ sg_dma_address(&sg[i]) = rw_data->dma_info[i].token;
+ sg_dma_len(&sg[i]) = rw_data->dma_info[i].len;
+ *total_len += rw_data->dma_info[i].len;
+ }
+ return i;
+}
+
+/*
+ * Restart all queues, starting with the one _after_ the disk given,
+ * thus reducing the chance of starvation of higher numbered disks.
+ */
+static void viodasd_restart_all_queues_starting_from(int first_index)
+{
+ int i;
+
+ for (i = first_index + 1; i < MAX_DISKNO; ++i)
+ if (viodasd_devices[i].disk)
+ blk_run_queue(viodasd_devices[i].disk->queue);
+ for (i = 0; i <= first_index; ++i)
+ if (viodasd_devices[i].disk)
+ blk_run_queue(viodasd_devices[i].disk->queue);
+}
+
+/*
+ * For read and write requests, decrement the number of outstanding requests,
+ * Free the DMA buffers we allocated.
+ */
+static int viodasd_handle_read_write(struct vioblocklpevent *bevent)
+{
+ int num_sg, num_sect, pci_direction, total_len;
+ struct request *req;
+ struct scatterlist sg[VIOMAXBLOCKDMA];
+ struct HvLpEvent *event = &bevent->event;
+ unsigned long irq_flags;
+ struct viodasd_device *d;
+ int error;
+ spinlock_t *qlock;
+
+ num_sg = block_event_to_scatterlist(bevent, sg, &total_len);
+ num_sect = total_len >> 9;
+ if (event->xSubtype == (viomajorsubtype_blockio | vioblockread))
+ pci_direction = DMA_FROM_DEVICE;
+ else
+ pci_direction = DMA_TO_DEVICE;
+ req = (struct request *)bevent->event.xCorrelationToken;
+ d = req->rq_disk->private_data;
+
+ dma_unmap_sg(d->dev, sg, num_sg, pci_direction);
+
+ /*
+ * Since this is running in interrupt mode, we need to make sure
+ * we're not stepping on any global I/O operations
+ */
+ spin_lock_irqsave(&viodasd_spinlock, irq_flags);
+ num_req_outstanding--;
+ spin_unlock_irqrestore(&viodasd_spinlock, irq_flags);
+
+ error = (event->xRc == HvLpEvent_Rc_Good) ? 0 : -EIO;
+ if (error) {
+ const struct vio_error_entry *err;
+ err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
+ printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n",
+ event->xRc, bevent->sub_result, err->msg);
+ num_sect = req->hard_nr_sectors;
+ }
+ qlock = req->q->queue_lock;
+ spin_lock_irqsave(qlock, irq_flags);
+ viodasd_end_request(req, error, num_sect);
+ spin_unlock_irqrestore(qlock, irq_flags);
+
+ /* Finally, try to get more requests off of this device's queue */
+ viodasd_restart_all_queues_starting_from(DEVICE_NO(d));
+
+ return 0;
+}
+
+/* This routine handles incoming block LP events */
+static void handle_block_event(struct HvLpEvent *event)
+{
+ struct vioblocklpevent *bevent = (struct vioblocklpevent *)event;
+ struct viodasd_waitevent *pwe;
+
+ if (event == NULL)
+ /* Notification that a partition went away! */
+ return;
+ /* First, we should NEVER get an int here...only acks */
+ if (hvlpevent_is_int(event)) {
+ printk(VIOD_KERN_WARNING
+ "Yikes! got an int in viodasd event handler!\n");
+ if (hvlpevent_need_ack(event)) {
+ event->xRc = HvLpEvent_Rc_InvalidSubtype;
+ HvCallEvent_ackLpEvent(event);
+ }
+ }
+
+ switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
+ case vioblockopen:
+ /*
+ * Handle a response to an open request. We get all the
+ * disk information in the response, so update it. The
+ * correlation token contains a pointer to a waitevent
+ * structure that has a completion in it. update the
+ * return code in the waitevent structure and post the
+ * completion to wake up the guy who sent the request
+ */
+ pwe = (struct viodasd_waitevent *)event->xCorrelationToken;
+ pwe->rc = event->xRc;
+ pwe->sub_result = bevent->sub_result;
+ if (event->xRc == HvLpEvent_Rc_Good) {
+ const struct open_data *data = &bevent->u.open_data;
+ struct viodasd_device *device =
+ &viodasd_devices[bevent->disk];
+ device->read_only =
+ bevent->flags & vioblockflags_ro;
+ device->size = data->disk_size;
+ device->cylinders = data->cylinders;
+ device->tracks = data->tracks;
+ device->sectors = data->sectors;
+ device->bytes_per_sector = data->bytes_per_sector;
+ pwe->max_disk = data->max_disk;
+ }
+ complete(&pwe->com);
+ break;
+ case vioblockclose:
+ break;
+ case vioblockread:
+ case vioblockwrite:
+ viodasd_handle_read_write(bevent);
+ break;
+
+ default:
+ printk(VIOD_KERN_WARNING "invalid subtype!");
+ if (hvlpevent_need_ack(event)) {
+ event->xRc = HvLpEvent_Rc_InvalidSubtype;
+ HvCallEvent_ackLpEvent(event);
+ }
+ }
+}
+
+/*
+ * Get the driver to reprobe for more disks.
+ */
+static ssize_t probe_disks(struct device_driver *drv, const char *buf,
+ size_t count)
+{
+ struct viodasd_device *d;
+
+ for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) {
+ if (d->disk == NULL)
+ probe_disk(d);
+ }
+ return count;
+}
+static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks);
+
+static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+ struct viodasd_device *d = &viodasd_devices[vdev->unit_address];
+
+ d->dev = &vdev->dev;
+ if (!probe_disk(d))
+ return -ENODEV;
+ return 0;
+}
+
+static int viodasd_remove(struct vio_dev *vdev)
+{
+ struct viodasd_device *d;
+
+ d = &viodasd_devices[vdev->unit_address];
+ if (d->disk) {
+ del_gendisk(d->disk);
+ blk_cleanup_queue(d->disk->queue);
+ put_disk(d->disk);
+ d->disk = NULL;
+ }
+ d->dev = NULL;
+ return 0;
+}
+
+/**
+ * viodasd_device_table: Used by vio.c to match devices that we
+ * support.
+ */
+static struct vio_device_id viodasd_device_table[] __devinitdata = {
+ { "block", "IBM,iSeries-viodasd" },
+ { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, viodasd_device_table);
+
+static struct vio_driver viodasd_driver = {
+ .id_table = viodasd_device_table,
+ .probe = viodasd_probe,
+ .remove = viodasd_remove,
+ .driver = {
+ .name = "viodasd",
+ .owner = THIS_MODULE,
+ }
+};
+
+static int need_delete_probe;
+
+/*
+ * Initialize the whole device driver. Handle module and non-module
+ * versions
+ */
+static int __init viodasd_init(void)
+{
+ int rc;
+
+ if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
+ rc = -ENODEV;
+ goto early_fail;
+ }
+
+ /* Try to open to our host lp */
+ if (viopath_hostLp == HvLpIndexInvalid)
+ vio_set_hostlp();
+
+ if (viopath_hostLp == HvLpIndexInvalid) {
+ printk(VIOD_KERN_WARNING "invalid hosting partition\n");
+ rc = -EIO;
+ goto early_fail;
+ }
+
+ printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n",
+ viopath_hostLp);
+
+ /* register the block device */
+ rc = register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
+ if (rc) {
+ printk(VIOD_KERN_WARNING
+ "Unable to get major number %d for %s\n",
+ VIODASD_MAJOR, VIOD_GENHD_NAME);
+ goto early_fail;
+ }
+ /* Actually open the path to the hosting partition */
+ rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio,
+ VIOMAXREQ + 2);
+ if (rc) {
+ printk(VIOD_KERN_WARNING
+ "error opening path to host partition %d\n",
+ viopath_hostLp);
+ goto unregister_blk;
+ }
+
+ /* Initialize our request handler */
+ vio_setHandler(viomajorsubtype_blockio, handle_block_event);
+
+ rc = vio_register_driver(&viodasd_driver);
+ if (rc) {
+ printk(VIOD_KERN_WARNING "vio_register_driver failed\n");
+ goto unset_handler;
+ }
+
+ /*
+ * If this call fails, it just means that we cannot dynamically
+ * add virtual disks, but the driver will still work fine for
+ * all existing disk, so ignore the failure.
+ */
+ if (!driver_create_file(&viodasd_driver.driver, &driver_attr_probe))
+ need_delete_probe = 1;
+
+ return 0;
+
+unset_handler:
+ vio_clearHandler(viomajorsubtype_blockio);
+ viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
+unregister_blk:
+ unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
+early_fail:
+ return rc;
+}
+module_init(viodasd_init);
+
+void __exit viodasd_exit(void)
+{
+ if (need_delete_probe)
+ driver_remove_file(&viodasd_driver.driver, &driver_attr_probe);
+ vio_unregister_driver(&viodasd_driver);
+ vio_clearHandler(viomajorsubtype_blockio);
+ viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
+ unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
+}
+module_exit(viodasd_exit);
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