linux/drivers/block/sunvdc.c

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/* sunvdc.c: Sun LDOM Virtual Disk Client.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/scatterlist.h>
#include <asm/vio.h>
#include <asm/ldc.h>
#define DRV_MODULE_NAME "sunvdc"
#define PFX DRV_MODULE_NAME ": "
#define DRV_MODULE_VERSION "1.0"
#define DRV_MODULE_RELDATE "June 25, 2007"
static char version[] __devinitdata =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
#define VDC_TX_RING_SIZE 256
#define WAITING_FOR_LINK_UP 0x01
#define WAITING_FOR_TX_SPACE 0x02
#define WAITING_FOR_GEN_CMD 0x04
#define WAITING_FOR_ANY -1
struct vdc_req_entry {
struct request *req;
};
struct vdc_port {
struct vio_driver_state vio;
struct gendisk *disk;
struct vdc_completion *cmp;
u64 req_id;
u64 seq;
struct vdc_req_entry rq_arr[VDC_TX_RING_SIZE];
unsigned long ring_cookies;
u64 max_xfer_size;
u32 vdisk_block_size;
/* The server fills these in for us in the disk attribute
* ACK packet.
*/
u64 operations;
u32 vdisk_size;
u8 vdisk_type;
char disk_name[32];
struct vio_disk_geom geom;
struct vio_disk_vtoc label;
};
static inline struct vdc_port *to_vdc_port(struct vio_driver_state *vio)
{
return container_of(vio, struct vdc_port, vio);
}
/* Ordered from largest major to lowest */
static struct vio_version vdc_versions[] = {
{ .major = 1, .minor = 0 },
};
#define VDCBLK_NAME "vdisk"
static int vdc_major;
#define PARTITION_SHIFT 3
static inline u32 vdc_tx_dring_avail(struct vio_dring_state *dr)
{
return vio_dring_avail(dr, VDC_TX_RING_SIZE);
}
static int vdc_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct gendisk *disk = bdev->bd_disk;
struct vdc_port *port = disk->private_data;
geo->heads = (u8) port->geom.num_hd;
geo->sectors = (u8) port->geom.num_sec;
geo->cylinders = port->geom.num_cyl;
return 0;
}
static const struct block_device_operations vdc_fops = {
.owner = THIS_MODULE,
.getgeo = vdc_getgeo,
};
static void vdc_finish(struct vio_driver_state *vio, int err, int waiting_for)
{
if (vio->cmp &&
(waiting_for == -1 ||
vio->cmp->waiting_for == waiting_for)) {
vio->cmp->err = err;
complete(&vio->cmp->com);
vio->cmp = NULL;
}
}
static void vdc_handshake_complete(struct vio_driver_state *vio)
{
vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
}
static int vdc_handle_unknown(struct vdc_port *port, void *arg)
{
struct vio_msg_tag *pkt = arg;
printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
printk(KERN_ERR PFX "Resetting connection.\n");
ldc_disconnect(port->vio.lp);
return -ECONNRESET;
}
static int vdc_send_attr(struct vio_driver_state *vio)
{
struct vdc_port *port = to_vdc_port(vio);
struct vio_disk_attr_info pkt;
memset(&pkt, 0, sizeof(pkt));
pkt.tag.type = VIO_TYPE_CTRL;
pkt.tag.stype = VIO_SUBTYPE_INFO;
pkt.tag.stype_env = VIO_ATTR_INFO;
pkt.tag.sid = vio_send_sid(vio);
pkt.xfer_mode = VIO_DRING_MODE;
pkt.vdisk_block_size = port->vdisk_block_size;
pkt.max_xfer_size = port->max_xfer_size;
viodbg(HS, "SEND ATTR xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
pkt.xfer_mode, pkt.vdisk_block_size, pkt.max_xfer_size);
return vio_ldc_send(&port->vio, &pkt, sizeof(pkt));
}
static int vdc_handle_attr(struct vio_driver_state *vio, void *arg)
{
struct vdc_port *port = to_vdc_port(vio);
struct vio_disk_attr_info *pkt = arg;
viodbg(HS, "GOT ATTR stype[0x%x] ops[%llx] disk_size[%llu] disk_type[%x] "
"xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
pkt->tag.stype, pkt->operations,
pkt->vdisk_size, pkt->vdisk_type,
pkt->xfer_mode, pkt->vdisk_block_size,
pkt->max_xfer_size);
if (pkt->tag.stype == VIO_SUBTYPE_ACK) {
switch (pkt->vdisk_type) {
case VD_DISK_TYPE_DISK:
case VD_DISK_TYPE_SLICE:
break;
default:
printk(KERN_ERR PFX "%s: Bogus vdisk_type 0x%x\n",
vio->name, pkt->vdisk_type);
return -ECONNRESET;
}
if (pkt->vdisk_block_size > port->vdisk_block_size) {
printk(KERN_ERR PFX "%s: BLOCK size increased "
"%u --> %u\n",
vio->name,
port->vdisk_block_size, pkt->vdisk_block_size);
return -ECONNRESET;
}
port->operations = pkt->operations;
port->vdisk_size = pkt->vdisk_size;
port->vdisk_type = pkt->vdisk_type;
if (pkt->max_xfer_size < port->max_xfer_size)
port->max_xfer_size = pkt->max_xfer_size;
port->vdisk_block_size = pkt->vdisk_block_size;
return 0;
} else {
printk(KERN_ERR PFX "%s: Attribute NACK\n", vio->name);
return -ECONNRESET;
}
}
static void vdc_end_special(struct vdc_port *port, struct vio_disk_desc *desc)
{
int err = desc->status;
vdc_finish(&port->vio, -err, WAITING_FOR_GEN_CMD);
}
static void vdc_end_one(struct vdc_port *port, struct vio_dring_state *dr,
unsigned int index)
{
struct vio_disk_desc *desc = vio_dring_entry(dr, index);
struct vdc_req_entry *rqe = &port->rq_arr[index];
struct request *req;
if (unlikely(desc->hdr.state != VIO_DESC_DONE))
return;
ldc_unmap(port->vio.lp, desc->cookies, desc->ncookies);
desc->hdr.state = VIO_DESC_FREE;
dr->cons = (index + 1) & (VDC_TX_RING_SIZE - 1);
req = rqe->req;
if (req == NULL) {
vdc_end_special(port, desc);
return;
}
rqe->req = NULL;
__blk_end_request(req, (desc->status ? -EIO : 0), desc->size);
if (blk_queue_stopped(port->disk->queue))
blk_start_queue(port->disk->queue);
}
static int vdc_ack(struct vdc_port *port, void *msgbuf)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct vio_dring_data *pkt = msgbuf;
if (unlikely(pkt->dring_ident != dr->ident ||
pkt->start_idx != pkt->end_idx ||
pkt->start_idx >= VDC_TX_RING_SIZE))
return 0;
vdc_end_one(port, dr, pkt->start_idx);
return 0;
}
static int vdc_nack(struct vdc_port *port, void *msgbuf)
{
/* XXX Implement me XXX */
return 0;
}
static void vdc_event(void *arg, int event)
{
struct vdc_port *port = arg;
struct vio_driver_state *vio = &port->vio;
unsigned long flags;
int err;
spin_lock_irqsave(&vio->lock, flags);
if (unlikely(event == LDC_EVENT_RESET ||
event == LDC_EVENT_UP)) {
vio_link_state_change(vio, event);
spin_unlock_irqrestore(&vio->lock, flags);
return;
}
if (unlikely(event != LDC_EVENT_DATA_READY)) {
printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
spin_unlock_irqrestore(&vio->lock, flags);
return;
}
err = 0;
while (1) {
union {
struct vio_msg_tag tag;
u64 raw[8];
} msgbuf;
err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
if (unlikely(err < 0)) {
if (err == -ECONNRESET)
vio_conn_reset(vio);
break;
}
if (err == 0)
break;
viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
msgbuf.tag.type,
msgbuf.tag.stype,
msgbuf.tag.stype_env,
msgbuf.tag.sid);
err = vio_validate_sid(vio, &msgbuf.tag);
if (err < 0)
break;
if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
if (msgbuf.tag.stype == VIO_SUBTYPE_ACK)
err = vdc_ack(port, &msgbuf);
else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK)
err = vdc_nack(port, &msgbuf);
else
err = vdc_handle_unknown(port, &msgbuf);
} else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
err = vio_control_pkt_engine(vio, &msgbuf);
} else {
err = vdc_handle_unknown(port, &msgbuf);
}
if (err < 0)
break;
}
if (err < 0)
vdc_finish(&port->vio, err, WAITING_FOR_ANY);
spin_unlock_irqrestore(&vio->lock, flags);
}
static int __vdc_tx_trigger(struct vdc_port *port)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct vio_dring_data hdr = {
.tag = {
.type = VIO_TYPE_DATA,
.stype = VIO_SUBTYPE_INFO,
.stype_env = VIO_DRING_DATA,
.sid = vio_send_sid(&port->vio),
},
.dring_ident = dr->ident,
.start_idx = dr->prod,
.end_idx = dr->prod,
};
int err, delay;
hdr.seq = dr->snd_nxt;
delay = 1;
do {
err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
if (err > 0) {
dr->snd_nxt++;
break;
}
udelay(delay);
if ((delay <<= 1) > 128)
delay = 128;
} while (err == -EAGAIN);
return err;
}
static int __send_request(struct request *req)
{
struct vdc_port *port = req->rq_disk->private_data;
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct scatterlist sg[port->ring_cookies];
struct vdc_req_entry *rqe;
struct vio_disk_desc *desc;
unsigned int map_perm;
int nsg, err, i;
u64 len;
u8 op;
map_perm = LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
if (rq_data_dir(req) == READ) {
map_perm |= LDC_MAP_W;
op = VD_OP_BREAD;
} else {
map_perm |= LDC_MAP_R;
op = VD_OP_BWRITE;
}
sg_init_table(sg, port->ring_cookies);
nsg = blk_rq_map_sg(req->q, req, sg);
len = 0;
for (i = 0; i < nsg; i++)
len += sg[i].length;
if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
blk_stop_queue(port->disk->queue);
err = -ENOMEM;
goto out;
}
desc = vio_dring_cur(dr);
err = ldc_map_sg(port->vio.lp, sg, nsg,
desc->cookies, port->ring_cookies,
map_perm);
if (err < 0) {
printk(KERN_ERR PFX "ldc_map_sg() failure, err=%d.\n", err);
return err;
}
rqe = &port->rq_arr[dr->prod];
rqe->req = req;
desc->hdr.ack = VIO_ACK_ENABLE;
desc->req_id = port->req_id;
desc->operation = op;
if (port->vdisk_type == VD_DISK_TYPE_DISK) {
desc->slice = 0xff;
} else {
desc->slice = 0;
}
desc->status = ~0;
block: convert to pos and nr_sectors accessors With recent cleanups, there is no place where low level driver directly manipulates request fields. This means that the 'hard' request fields always equal the !hard fields. Convert all rq->sectors, nr_sectors and current_nr_sectors references to accessors. While at it, drop superflous blk_rq_pos() < 0 test in swim.c. [ Impact: use pos and nr_sectors accessors ] Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Tested-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Adrian McMenamin <adrian@mcmen.demon.co.uk> Acked-by: Mike Miller <mike.miller@hp.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Dario Ballabio <ballabio_dario@emc.com> Cc: David S. Miller <davem@davemloft.net> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: unsik Kim <donari75@gmail.com> Cc: Laurent Vivier <Laurent@lvivier.info> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-07 13:24:39 +00:00
desc->offset = (blk_rq_pos(req) << 9) / port->vdisk_block_size;
desc->size = len;
desc->ncookies = err;
/* This has to be a non-SMP write barrier because we are writing
* to memory which is shared with the peer LDOM.
*/
wmb();
desc->hdr.state = VIO_DESC_READY;
err = __vdc_tx_trigger(port);
if (err < 0) {
printk(KERN_ERR PFX "vdc_tx_trigger() failure, err=%d\n", err);
} else {
port->req_id++;
dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
}
out:
return err;
}
static void do_vdc_request(struct request_queue *q)
{
while (1) {
block: implement and enforce request peek/start/fetch Till now block layer allowed two separate modes of request execution. A request is always acquired from the request queue via elv_next_request(). After that, drivers are free to either dequeue it or process it without dequeueing. Dequeue allows elv_next_request() to return the next request so that multiple requests can be in flight. Executing requests without dequeueing has its merits mostly in allowing drivers for simpler devices which can't do sg to deal with segments only without considering request boundary. However, the benefit this brings is dubious and declining while the cost of the API ambiguity is increasing. Segment based drivers are usually for very old or limited devices and as converting to dequeueing model isn't difficult, it doesn't justify the API overhead it puts on block layer and its more modern users. Previous patches converted all block low level drivers to dequeueing model. This patch completes the API transition by... * renaming elv_next_request() to blk_peek_request() * renaming blkdev_dequeue_request() to blk_start_request() * adding blk_fetch_request() which is combination of peek and start * disallowing completion of queued (not started) requests * applying new API to all LLDs Renamings are for consistency and to break out of tree code so that it's apparent that out of tree drivers need updating. [ Impact: block request issue API cleanup, no functional change ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Mike Miller <mike.miller@hp.com> Cc: unsik Kim <donari75@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Cc: Tim Waugh <tim@cyberelk.net> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: David S. Miller <davem@davemloft.net> Cc: Laurent Vivier <Laurent@lvivier.info> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Adrian McMenamin <adrian@mcmen.demon.co.uk> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Borislav Petkov <petkovbb@googlemail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Alex Dubov <oakad@yahoo.com> Cc: Pierre Ossman <drzeus@drzeus.cx> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Markus Lidel <Markus.Lidel@shadowconnect.com> Cc: Stefan Weinhuber <wein@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-05-08 02:54:16 +00:00
struct request *req = blk_fetch_request(q);
if (!req)
break;
if (__send_request(req) < 0)
__blk_end_request_all(req, -EIO);
}
}
static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
{
struct vio_dring_state *dr;
struct vio_completion comp;
struct vio_disk_desc *desc;
unsigned int map_perm;
unsigned long flags;
int op_len, err;
void *req_buf;
if (!(((u64)1 << ((u64)op - 1)) & port->operations))
return -EOPNOTSUPP;
switch (op) {
case VD_OP_BREAD:
case VD_OP_BWRITE:
default:
return -EINVAL;
case VD_OP_FLUSH:
op_len = 0;
map_perm = 0;
break;
case VD_OP_GET_WCE:
op_len = sizeof(u32);
map_perm = LDC_MAP_W;
break;
case VD_OP_SET_WCE:
op_len = sizeof(u32);
map_perm = LDC_MAP_R;
break;
case VD_OP_GET_VTOC:
op_len = sizeof(struct vio_disk_vtoc);
map_perm = LDC_MAP_W;
break;
case VD_OP_SET_VTOC:
op_len = sizeof(struct vio_disk_vtoc);
map_perm = LDC_MAP_R;
break;
case VD_OP_GET_DISKGEOM:
op_len = sizeof(struct vio_disk_geom);
map_perm = LDC_MAP_W;
break;
case VD_OP_SET_DISKGEOM:
op_len = sizeof(struct vio_disk_geom);
map_perm = LDC_MAP_R;
break;
case VD_OP_SCSICMD:
op_len = 16;
map_perm = LDC_MAP_RW;
break;
case VD_OP_GET_DEVID:
op_len = sizeof(struct vio_disk_devid);
map_perm = LDC_MAP_W;
break;
case VD_OP_GET_EFI:
case VD_OP_SET_EFI:
return -EOPNOTSUPP;
break;
};
map_perm |= LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_IO;
op_len = (op_len + 7) & ~7;
req_buf = kzalloc(op_len, GFP_KERNEL);
if (!req_buf)
return -ENOMEM;
if (len > op_len)
len = op_len;
if (map_perm & LDC_MAP_R)
memcpy(req_buf, buf, len);
spin_lock_irqsave(&port->vio.lock, flags);
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
/* XXX If we want to use this code generically we have to
* XXX handle TX ring exhaustion etc.
*/
desc = vio_dring_cur(dr);
err = ldc_map_single(port->vio.lp, req_buf, op_len,
desc->cookies, port->ring_cookies,
map_perm);
if (err < 0) {
spin_unlock_irqrestore(&port->vio.lock, flags);
kfree(req_buf);
return err;
}
init_completion(&comp.com);
comp.waiting_for = WAITING_FOR_GEN_CMD;
port->vio.cmp = &comp;
desc->hdr.ack = VIO_ACK_ENABLE;
desc->req_id = port->req_id;
desc->operation = op;
desc->slice = 0;
desc->status = ~0;
desc->offset = 0;
desc->size = op_len;
desc->ncookies = err;
/* This has to be a non-SMP write barrier because we are writing
* to memory which is shared with the peer LDOM.
*/
wmb();
desc->hdr.state = VIO_DESC_READY;
err = __vdc_tx_trigger(port);
if (err >= 0) {
port->req_id++;
dr->prod = (dr->prod + 1) & (VDC_TX_RING_SIZE - 1);
spin_unlock_irqrestore(&port->vio.lock, flags);
wait_for_completion(&comp.com);
err = comp.err;
} else {
port->vio.cmp = NULL;
spin_unlock_irqrestore(&port->vio.lock, flags);
}
if (map_perm & LDC_MAP_W)
memcpy(buf, req_buf, len);
kfree(req_buf);
return err;
}
static int __devinit vdc_alloc_tx_ring(struct vdc_port *port)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
unsigned long len, entry_size;
int ncookies;
void *dring;
entry_size = sizeof(struct vio_disk_desc) +
(sizeof(struct ldc_trans_cookie) * port->ring_cookies);
len = (VDC_TX_RING_SIZE * entry_size);
ncookies = VIO_MAX_RING_COOKIES;
dring = ldc_alloc_exp_dring(port->vio.lp, len,
dr->cookies, &ncookies,
(LDC_MAP_SHADOW |
LDC_MAP_DIRECT |
LDC_MAP_RW));
if (IS_ERR(dring))
return PTR_ERR(dring);
dr->base = dring;
dr->entry_size = entry_size;
dr->num_entries = VDC_TX_RING_SIZE;
dr->prod = dr->cons = 0;
dr->pending = VDC_TX_RING_SIZE;
dr->ncookies = ncookies;
return 0;
}
static void vdc_free_tx_ring(struct vdc_port *port)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
if (dr->base) {
ldc_free_exp_dring(port->vio.lp, dr->base,
(dr->entry_size * dr->num_entries),
dr->cookies, dr->ncookies);
dr->base = NULL;
dr->entry_size = 0;
dr->num_entries = 0;
dr->pending = 0;
dr->ncookies = 0;
}
}
static int probe_disk(struct vdc_port *port)
{
struct vio_completion comp;
struct request_queue *q;
struct gendisk *g;
int err;
init_completion(&comp.com);
comp.err = 0;
comp.waiting_for = WAITING_FOR_LINK_UP;
port->vio.cmp = &comp;
vio_port_up(&port->vio);
wait_for_completion(&comp.com);
if (comp.err)
return comp.err;
err = generic_request(port, VD_OP_GET_VTOC,
&port->label, sizeof(port->label));
if (err < 0) {
printk(KERN_ERR PFX "VD_OP_GET_VTOC returns error %d\n", err);
return err;
}
err = generic_request(port, VD_OP_GET_DISKGEOM,
&port->geom, sizeof(port->geom));
if (err < 0) {
printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
"error %d\n", err);
return err;
}
port->vdisk_size = ((u64)port->geom.num_cyl *
(u64)port->geom.num_hd *
(u64)port->geom.num_sec);
q = blk_init_queue(do_vdc_request, &port->vio.lock);
if (!q) {
printk(KERN_ERR PFX "%s: Could not allocate queue.\n",
port->vio.name);
return -ENOMEM;
}
g = alloc_disk(1 << PARTITION_SHIFT);
if (!g) {
printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
port->vio.name);
blk_cleanup_queue(q);
return -ENOMEM;
}
port->disk = g;
blk_queue_max_hw_segments(q, port->ring_cookies);
blk_queue_max_phys_segments(q, port->ring_cookies);
blk_queue_max_sectors(q, port->max_xfer_size);
g->major = vdc_major;
g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
strcpy(g->disk_name, port->disk_name);
g->fops = &vdc_fops;
g->queue = q;
g->private_data = port;
g->driverfs_dev = &port->vio.vdev->dev;
set_capacity(g, port->vdisk_size);
printk(KERN_INFO PFX "%s: %u sectors (%u MB)\n",
g->disk_name,
port->vdisk_size, (port->vdisk_size >> (20 - 9)));
add_disk(g);
return 0;
}
static struct ldc_channel_config vdc_ldc_cfg = {
.event = vdc_event,
.mtu = 64,
.mode = LDC_MODE_UNRELIABLE,
};
static struct vio_driver_ops vdc_vio_ops = {
.send_attr = vdc_send_attr,
.handle_attr = vdc_handle_attr,
.handshake_complete = vdc_handshake_complete,
};
static void __devinit print_version(void)
{
static int version_printed;
if (version_printed++ == 0)
printk(KERN_INFO "%s", version);
}
static int __devinit vdc_port_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
struct mdesc_handle *hp;
struct vdc_port *port;
int err;
print_version();
hp = mdesc_grab();
err = -ENODEV;
if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
printk(KERN_ERR PFX "Port id [%llu] too large.\n",
vdev->dev_no);
goto err_out_release_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
err = -ENOMEM;
if (!port) {
printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
goto err_out_release_mdesc;
}
if (vdev->dev_no >= 26)
snprintf(port->disk_name, sizeof(port->disk_name),
VDCBLK_NAME "%c%c",
'a' + ((int)vdev->dev_no / 26) - 1,
'a' + ((int)vdev->dev_no % 26));
else
snprintf(port->disk_name, sizeof(port->disk_name),
VDCBLK_NAME "%c", 'a' + ((int)vdev->dev_no % 26));
err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
vdc_versions, ARRAY_SIZE(vdc_versions),
&vdc_vio_ops, port->disk_name);
if (err)
goto err_out_free_port;
port->vdisk_block_size = 512;
port->max_xfer_size = ((128 * 1024) / port->vdisk_block_size);
port->ring_cookies = ((port->max_xfer_size *
port->vdisk_block_size) / PAGE_SIZE) + 2;
err = vio_ldc_alloc(&port->vio, &vdc_ldc_cfg, port);
if (err)
goto err_out_free_port;
err = vdc_alloc_tx_ring(port);
if (err)
goto err_out_free_ldc;
err = probe_disk(port);
if (err)
goto err_out_free_tx_ring;
dev_set_drvdata(&vdev->dev, port);
mdesc_release(hp);
return 0;
err_out_free_tx_ring:
vdc_free_tx_ring(port);
err_out_free_ldc:
vio_ldc_free(&port->vio);
err_out_free_port:
kfree(port);
err_out_release_mdesc:
mdesc_release(hp);
return err;
}
static int vdc_port_remove(struct vio_dev *vdev)
{
struct vdc_port *port = dev_get_drvdata(&vdev->dev);
if (port) {
del_timer_sync(&port->vio.timer);
vdc_free_tx_ring(port);
vio_ldc_free(&port->vio);
dev_set_drvdata(&vdev->dev, NULL);
kfree(port);
}
return 0;
}
static const struct vio_device_id vdc_port_match[] = {
{
.type = "vdc-port",
},
{},
};
MODULE_DEVICE_TABLE(vio, vdc_port_match);
static struct vio_driver vdc_port_driver = {
.id_table = vdc_port_match,
.probe = vdc_port_probe,
.remove = vdc_port_remove,
.driver = {
.name = "vdc_port",
.owner = THIS_MODULE,
}
};
static int __init vdc_init(void)
{
int err;
err = register_blkdev(0, VDCBLK_NAME);
if (err < 0)
goto out_err;
vdc_major = err;
err = vio_register_driver(&vdc_port_driver);
if (err)
goto out_unregister_blkdev;
return 0;
out_unregister_blkdev:
unregister_blkdev(vdc_major, VDCBLK_NAME);
vdc_major = 0;
out_err:
return err;
}
static void __exit vdc_exit(void)
{
vio_unregister_driver(&vdc_port_driver);
unregister_blkdev(vdc_major, VDCBLK_NAME);
}
module_init(vdc_init);
module_exit(vdc_exit);