Revision dda50e716dc9451f40eebfb2902c260e4f62cf34 authored by Andi Kleen on 17 May 2005, 04:53:25 UTC, committed by Linus Torvalds on 17 May 2005, 14:59:14 UTC
The new TSC sync algorithm recently submitted did not work too well. The result was that some MP machines where the TSC came up of the BIOS very unsynchronized and that did not have HPET support were nearly unusable because the time would jump forwards and backwards between CPUs. After a lot of research ;-) and some more prototypes I ended up with just using the one from IA64 which looks best. It has some internal self tuning that should adapt to changing interconnect latencies. It holds up in my tests so far. I believe it was originally written by David Mosberger, I just ported it over to x86-64. See the inline comment for a description. This cleans up the code because it uses smp_call_function for syncing instead of having custom hooks in SMP bootup. Please note that the cycle numbers it outputs are too optimistic because they do not take into account the latency of WRMSR and RDTSC, which can be hundreds of cycles. It seems to be able to sync a dual Opteron to 200-300 cycles, which is probably good enough. There is a timing window during AP bootup where interrupts can see inconsistent time before the TSC is synced. It is hard to avoid unfortunately because we can only do the TSC sync after some setup, and we need to enable interrupts before that. I just ignored it for now. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent 93ef70a
viodasd.c
/* -*- 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 <sfr@au1.ibm.com>
*
* (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/kernel.h>
#include <asm/uaccess.h>
#include <asm/vio.h>
#include <asm/iSeries/HvTypes.h>
#include <asm/iSeries/HvLpEvent.h>
#include <asm/iSeries/HvLpConfig.h>
#include <asm/iSeries/vio.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_GENHD_DEVFS_NAME "iseries/disc"
#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 = sizeof(((struct gendisk *)0)->disk_name)
};
static DEFINE_SPINLOCK(viodasd_spinlock);
#define VIOMAXREQ 16
#define VIOMAXBLOCKDMA 12
#define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
struct open_data {
u64 disk_size;
u16 max_disk;
u16 cylinders;
u16 tracks;
u16 sectors;
u16 bytes_per_sector;
};
struct rw_data {
u64 offset;
struct {
u32 token;
u32 reserved;
u64 len;
} dma_info[VIOMAXBLOCKDMA];
};
struct vioblocklpevent {
struct HvLpEvent event;
u32 reserved;
u16 version;
u16 sub_result;
u16 disk;
u16 flags;
union {
struct open_data open_data;
struct rw_data rw_data;
u64 changed;
} u;
};
#define vioblockflags_ro 0x0001
enum vioblocksubtype {
vioblockopen = 0x0001,
vioblockclose = 0x0002,
vioblockread = 0x0003,
vioblockwrite = 0x0004,
vioblockflush = 0x0005,
vioblockcheck = 0x0007
};
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 inode *ino, struct file *fil)
{
struct viodasd_device *d = ino->i_bdev->bd_disk->private_data;
HvLpEvent_Rc hvrc;
struct viodasd_waitevent we;
u16 flags = 0;
if (d->read_only) {
if ((fil != NULL) && (fil->f_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 inode *ino, struct file *fil)
{
struct viodasd_device *d = ino->i_bdev->bd_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_ioctl(struct inode *ino, struct file *fil,
unsigned int cmd, unsigned long arg)
{
unsigned char sectors;
unsigned char heads;
unsigned short cylinders;
struct hd_geometry *geo;
struct gendisk *gendisk;
struct viodasd_device *d;
switch (cmd) {
case HDIO_GETGEO:
geo = (struct hd_geometry *)arg;
if (geo == NULL)
return -EINVAL;
if (!access_ok(VERIFY_WRITE, geo, sizeof(*geo)))
return -EFAULT;
gendisk = ino->i_bdev->bd_disk;
d = gendisk->private_data;
sectors = d->sectors;
if (sectors == 0)
sectors = 32;
heads = d->tracks;
if (heads == 0)
heads = 64;
cylinders = d->cylinders;
if (cylinders == 0)
cylinders = get_capacity(gendisk) / (sectors * heads);
if (__put_user(sectors, &geo->sectors) ||
__put_user(heads, &geo->heads) ||
__put_user(cylinders, &geo->cylinders) ||
__put_user(get_start_sect(ino->i_bdev), &geo->start))
return -EFAULT;
return 0;
}
return -EINVAL;
}
/*
* Our file operations table
*/
static struct block_device_operations viodasd_fops = {
.owner = THIS_MODULE,
.open = viodasd_open,
.release = viodasd_release,
.ioctl = viodasd_ioctl,
};
/*
* End a request
*/
static void viodasd_end_request(struct request *req, int uptodate,
int num_sectors)
{
if (end_that_request_first(req, uptodate, num_sectors))
return;
add_disk_randomness(req->rq_disk);
end_that_request_last(req);
}
/*
* 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 scatterlist sg[VIOMAXBLOCKDMA];
int sgindex;
int statindex;
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;
statindex = 0;
} else {
direction = DMA_TO_DEVICE;
viocmd = viomajorsubtype_blockio | vioblockwrite;
statindex = 1;
}
d = req->rq_disk->private_data;
/* Now build the scatter-gather list */
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));
bevent->event.xFlags.xValid = 1;
bevent->event.xFlags.xFunction = HvLpEvent_Function_Int;
bevent->event.xFlags.xAckInd = HvLpEvent_AckInd_DoAck;
bevent->event.xFlags.xAckType = HvLpEvent_AckType_ImmediateAck;
bevent->event.xType = HvLpEvent_Type_VirtualIo;
bevent->event.xSubtype = viocmd;
bevent->event.xSourceLp = HvLpConfig_getLpIndex();
bevent->event.xTargetLp = viopath_hostLp;
bevent->event.xSizeMinus1 =
offsetof(struct vioblocklpevent, u.rw_data.dma_info) +
(sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1;
bevent->event.xSourceInstanceId =
viopath_sourceinst(viopath_hostLp);
bevent->event.xTargetInstanceId =
viopath_targetinst(viopath_hostLp);
bevent->event.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(request_queue_t *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, 0, req->hard_nr_sectors);
continue;
}
/* Try sending the request */
if (send_request(req) != 0)
viodasd_end_request(req, 0, req->hard_nr_sectors);
}
}
/*
* Probe a single disk and fill in the viodasd_device structure
* for it.
*/
static void 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;
}
wait_for_completion(&we.com);
if (we.rc != 0) {
if (flags != 0)
return;
/* 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;
}
/* 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;
}
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;
}
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));
snprintf(g->devfs_name, sizeof(g->devfs_name),
"%s%d", VIOD_GENHD_DEVFS_NAME, dev_no);
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);
}
/* 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;
memset(sg, 0, sizeof(sg[0]) * 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;
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 (event->xFlags.xFunction == HvLpEvent_Function_Int) {
printk(VIOD_KERN_WARNING
"Yikes! got an int in viodasd event handler!\n");
if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
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 (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) {
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;
probe_disk(d);
if (d->disk == NULL)
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 = {
{ "viodasd", "" },
{ 0, }
};
MODULE_DEVICE_TABLE(vio, viodasd_device_table);
static struct vio_driver viodasd_driver = {
.name = "viodasd",
.id_table = viodasd_device_table,
.probe = viodasd_probe,
.remove = viodasd_remove
};
/*
* Initialize the whole device driver. Handle module and non-module
* versions
*/
static int __init viodasd_init(void)
{
int rc;
/* 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");
return -EIO;
}
printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n",
viopath_hostLp);
/* register the block device */
if (register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME)) {
printk(VIOD_KERN_WARNING
"Unable to get major number %d for %s\n",
VIODASD_MAJOR, VIOD_GENHD_NAME);
return -EIO;
}
/* Actually open the path to the hosting partition */
if (viopath_open(viopath_hostLp, viomajorsubtype_blockio,
VIOMAXREQ + 2)) {
printk(VIOD_KERN_WARNING
"error opening path to host partition %d\n",
viopath_hostLp);
unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
return -EIO;
}
/* Initialize our request handler */
vio_setHandler(viomajorsubtype_blockio, handle_block_event);
rc = vio_register_driver(&viodasd_driver);
if (rc == 0)
driver_create_file(&viodasd_driver.driver, &driver_attr_probe);
return rc;
}
module_init(viodasd_init);
void viodasd_exit(void)
{
driver_remove_file(&viodasd_driver.driver, &driver_attr_probe);
vio_unregister_driver(&viodasd_driver);
vio_clearHandler(viomajorsubtype_blockio);
unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
}
module_exit(viodasd_exit);
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