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sunvdc.c
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sunvdc.c
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// SPDX-License-Identifier: GPL-2.0-only
/* sunvdc.c: Sun LDOM Virtual Disk Client.
*
* Copyright (C) 2007, 2008 David S. Miller <[email protected]>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/blk-mq.h>
#include <linux/hdreg.h>
#include <linux/cdrom.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 "1.2"
#define DRV_MODULE_RELDATE "November 24, 2014"
static char version[] =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller ([email protected])");
MODULE_DESCRIPTION("Sun LDOM virtual disk client driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
#define VDC_TX_RING_SIZE 512
#define VDC_DEFAULT_BLK_SIZE 512
#define MAX_XFER_BLKS (128 * 1024)
#define MAX_XFER_SIZE (MAX_XFER_BLKS / VDC_DEFAULT_BLK_SIZE)
#define MAX_RING_COOKIES ((MAX_XFER_BLKS / PAGE_SIZE) + 2)
#define WAITING_FOR_LINK_UP 0x01
#define WAITING_FOR_TX_SPACE 0x02
#define WAITING_FOR_GEN_CMD 0x04
#define WAITING_FOR_ANY -1
#define VDC_MAX_RETRIES 10
static struct workqueue_struct *sunvdc_wq;
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;
u32 drain;
u64 ldc_timeout;
struct delayed_work ldc_reset_timer_work;
struct work_struct ldc_reset_work;
/* The server fills these in for us in the disk attribute
* ACK packet.
*/
u64 operations;
u32 vdisk_size;
u8 vdisk_type;
u8 vdisk_mtype;
u32 vdisk_phys_blksz;
struct blk_mq_tag_set tag_set;
char disk_name[32];
};
static void vdc_ldc_reset(struct vdc_port *port);
static void vdc_ldc_reset_work(struct work_struct *work);
static void vdc_ldc_reset_timer_work(struct work_struct *work);
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 = 2 },
{ .major = 1, .minor = 1 },
{ .major = 1, .minor = 0 },
};
static inline int vdc_version_supported(struct vdc_port *port,
u16 major, u16 minor)
{
return port->vio.ver.major == major && port->vio.ver.minor >= minor;
}
#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;
sector_t nsect = get_capacity(disk);
sector_t cylinders = nsect;
geo->heads = 0xff;
geo->sectors = 0x3f;
sector_div(cylinders, geo->heads * geo->sectors);
geo->cylinders = cylinders;
if ((sector_t)(geo->cylinders + 1) * geo->heads * geo->sectors < nsect)
geo->cylinders = 0xffff;
return 0;
}
/* Add ioctl/CDROM_GET_CAPABILITY to support cdrom_id in udev
* when vdisk_mtype is VD_MEDIA_TYPE_CD or VD_MEDIA_TYPE_DVD.
* Needed to be able to install inside an ldom from an iso image.
*/
static int vdc_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned command, unsigned long argument)
{
struct vdc_port *port = bdev->bd_disk->private_data;
int i;
switch (command) {
case CDROMMULTISESSION:
pr_debug(PFX "Multisession CDs not supported\n");
for (i = 0; i < sizeof(struct cdrom_multisession); i++)
if (put_user(0, (char __user *)(argument + i)))
return -EFAULT;
return 0;
case CDROM_GET_CAPABILITY:
if (!vdc_version_supported(port, 1, 1))
return -EINVAL;
switch (port->vdisk_mtype) {
case VD_MEDIA_TYPE_CD:
case VD_MEDIA_TYPE_DVD:
return 0;
default:
return -EINVAL;
}
default:
pr_debug(PFX "ioctl %08x not supported\n", command);
return -EINVAL;
}
}
static const struct block_device_operations vdc_fops = {
.owner = THIS_MODULE,
.getgeo = vdc_getgeo,
.ioctl = vdc_ioctl,
.compat_ioctl = blkdev_compat_ptr_ioctl,
};
static void vdc_blk_queue_start(struct vdc_port *port)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
/* restart blk queue when ring is half emptied. also called after
* handshake completes, so check for initial handshake before we've
* allocated a disk.
*/
if (port->disk && vdc_tx_dring_avail(dr) * 100 / VDC_TX_RING_SIZE >= 50)
blk_mq_start_stopped_hw_queues(port->disk->queue, true);
}
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)
{
struct vdc_port *port = to_vdc_port(vio);
cancel_delayed_work(&port->ldc_reset_timer_work);
vdc_finish(vio, 0, WAITING_FOR_LINK_UP);
vdc_blk_queue_start(port);
}
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] "
"mtype[0x%x] xfer_mode[0x%x] blksz[%u] max_xfer[%llu]\n",
pkt->tag.stype, pkt->operations,
pkt->vdisk_size, pkt->vdisk_type, pkt->vdisk_mtype,
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_type = pkt->vdisk_type;
if (vdc_version_supported(port, 1, 1)) {
port->vdisk_size = pkt->vdisk_size;
port->vdisk_mtype = pkt->vdisk_mtype;
}
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;
port->vdisk_phys_blksz = VDC_DEFAULT_BLK_SIZE;
if (vdc_version_supported(port, 1, 2))
port->vdisk_phys_blksz = pkt->phys_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 = vio_dring_next(dr, index);
req = rqe->req;
if (req == NULL) {
vdc_end_special(port, desc);
return;
}
rqe->req = NULL;
blk_mq_end_request(req, desc->status ? BLK_STS_IOERR : 0);
vdc_blk_queue_start(port);
}
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)) {
vio_link_state_change(vio, event);
queue_work(sunvdc_wq, &port->ldc_reset_work);
goto out;
}
if (unlikely(event == LDC_EVENT_UP)) {
vio_link_state_change(vio, event);
goto out;
}
if (unlikely(event != LDC_EVENT_DATA_READY)) {
pr_warn(PFX "Unexpected LDC event %d\n", event);
goto out;
}
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);
out:
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;
int retries = 0;
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;
if (retries++ > VDC_MAX_RETRIES)
break;
} while (err == -EAGAIN);
if (err == -ENOTCONN)
vdc_ldc_reset(port);
return err;
}
static int __send_request(struct request *req)
{
struct vdc_port *port = req->q->disk->private_data;
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct scatterlist sg[MAX_RING_COOKIES];
struct vdc_req_entry *rqe;
struct vio_disk_desc *desc;
unsigned int map_perm;
int nsg, err, i;
u64 len;
u8 op;
if (WARN_ON(port->ring_cookies > MAX_RING_COOKIES))
return -EINVAL;
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;
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;
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 = vio_dring_next(dr, dr->prod);
}
return err;
}
static blk_status_t vdc_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct vdc_port *port = hctx->queue->queuedata;
struct vio_dring_state *dr;
unsigned long flags;
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
blk_mq_start_request(bd->rq);
spin_lock_irqsave(&port->vio.lock, flags);
/*
* Doing drain, just end the request in error
*/
if (unlikely(port->drain)) {
spin_unlock_irqrestore(&port->vio.lock, flags);
return BLK_STS_IOERR;
}
if (unlikely(vdc_tx_dring_avail(dr) < 1)) {
spin_unlock_irqrestore(&port->vio.lock, flags);
blk_mq_stop_hw_queue(hctx);
return BLK_STS_DEV_RESOURCE;
}
if (__send_request(bd->rq) < 0) {
spin_unlock_irqrestore(&port->vio.lock, flags);
return BLK_STS_IOERR;
}
spin_unlock_irqrestore(&port->vio.lock, flags);
return BLK_STS_OK;
}
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) & 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;
}
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 = ∁
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 = vio_dring_next(dr, dr->prod);
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 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 vdc_port_up(struct vdc_port *port)
{
struct vio_completion comp;
init_completion(&comp.com);
comp.err = 0;
comp.waiting_for = WAITING_FOR_LINK_UP;
port->vio.cmp = ∁
vio_port_up(&port->vio);
wait_for_completion(&comp.com);
return comp.err;
}
static void vdc_port_down(struct vdc_port *port)
{
ldc_disconnect(port->vio.lp);
ldc_unbind(port->vio.lp);
vdc_free_tx_ring(port);
vio_ldc_free(&port->vio);
}
static const struct blk_mq_ops vdc_mq_ops = {
.queue_rq = vdc_queue_rq,
};
static int probe_disk(struct vdc_port *port)
{
struct request_queue *q;
struct gendisk *g;
int err;
err = vdc_port_up(port);
if (err)
return err;
/* Using version 1.2 means vdisk_phys_blksz should be set unless the
* disk is reserved by another system.
*/
if (vdc_version_supported(port, 1, 2) && !port->vdisk_phys_blksz)
return -ENODEV;
if (vdc_version_supported(port, 1, 1)) {
/* vdisk_size should be set during the handshake, if it wasn't
* then the underlying disk is reserved by another system
*/
if (port->vdisk_size == -1)
return -ENODEV;
} else {
struct vio_disk_geom geom;
err = generic_request(port, VD_OP_GET_DISKGEOM,
&geom, sizeof(geom));
if (err < 0) {
printk(KERN_ERR PFX "VD_OP_GET_DISKGEOM returns "
"error %d\n", err);
return err;
}
port->vdisk_size = ((u64)geom.num_cyl *
(u64)geom.num_hd *
(u64)geom.num_sec);
}
err = blk_mq_alloc_sq_tag_set(&port->tag_set, &vdc_mq_ops,
VDC_TX_RING_SIZE, BLK_MQ_F_SHOULD_MERGE);
if (err)
return err;
g = blk_mq_alloc_disk(&port->tag_set, port);
if (IS_ERR(g)) {
printk(KERN_ERR PFX "%s: Could not allocate gendisk.\n",
port->vio.name);
err = PTR_ERR(g);
goto out_free_tag;
}
port->disk = g;
q = g->queue;
/* Each segment in a request is up to an aligned page in size. */
blk_queue_segment_boundary(q, PAGE_SIZE - 1);
blk_queue_max_segment_size(q, PAGE_SIZE);
blk_queue_max_segments(q, port->ring_cookies);
blk_queue_max_hw_sectors(q, port->max_xfer_size);
g->major = vdc_major;
g->first_minor = port->vio.vdev->dev_no << PARTITION_SHIFT;
g->minors = 1 << PARTITION_SHIFT;
strcpy(g->disk_name, port->disk_name);
g->fops = &vdc_fops;
g->queue = q;
g->private_data = port;
set_capacity(g, port->vdisk_size);
if (vdc_version_supported(port, 1, 1)) {
switch (port->vdisk_mtype) {
case VD_MEDIA_TYPE_CD:
pr_info(PFX "Virtual CDROM %s\n", port->disk_name);
g->flags |= GENHD_FL_REMOVABLE;
set_disk_ro(g, 1);
break;
case VD_MEDIA_TYPE_DVD:
pr_info(PFX "Virtual DVD %s\n", port->disk_name);
g->flags |= GENHD_FL_REMOVABLE;
set_disk_ro(g, 1);
break;
case VD_MEDIA_TYPE_FIXED:
pr_info(PFX "Virtual Hard disk %s\n", port->disk_name);
break;
}
}
blk_queue_physical_block_size(q, port->vdisk_phys_blksz);
pr_info(PFX "%s: %u sectors (%u MB) protocol %d.%d\n",
g->disk_name,
port->vdisk_size, (port->vdisk_size >> (20 - 9)),
port->vio.ver.major, port->vio.ver.minor);
err = device_add_disk(&port->vio.vdev->dev, g, NULL);
if (err)
goto out_cleanup_disk;
return 0;
out_cleanup_disk:
put_disk(g);
out_free_tag:
blk_mq_free_tag_set(&port->tag_set);
return err;
}
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 print_version(void)
{
static int version_printed;
if (version_printed++ == 0)
printk(KERN_INFO "%s", version);
}
struct vdc_check_port_data {
int dev_no;
char *type;
};
static int vdc_device_probed(struct device *dev, void *arg)
{
struct vio_dev *vdev = to_vio_dev(dev);
struct vdc_check_port_data *port_data;
port_data = (struct vdc_check_port_data *)arg;
if ((vdev->dev_no == port_data->dev_no) &&
(!(strcmp((char *)&vdev->type, port_data->type))) &&
dev_get_drvdata(dev)) {
/* This device has already been configured
* by vdc_port_probe()
*/
return 1;
} else {
return 0;
}
}
/* Determine whether the VIO device is part of an mpgroup
* by locating all the virtual-device-port nodes associated
* with the parent virtual-device node for the VIO device
* and checking whether any of these nodes are vdc-ports
* which have already been configured.
*
* Returns true if this device is part of an mpgroup and has
* already been probed.
*/
static bool vdc_port_mpgroup_check(struct vio_dev *vdev)
{
struct vdc_check_port_data port_data;
struct device *dev;
port_data.dev_no = vdev->dev_no;
port_data.type = (char *)&vdev->type;
dev = device_find_child(vdev->dev.parent, &port_data,
vdc_device_probed);
if (dev)
return true;
return false;
}
static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
struct mdesc_handle *hp;
struct vdc_port *port;
int err;
const u64 *ldc_timeout;
print_version();
hp = mdesc_grab();
if (!hp)
return -ENODEV;
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;
}
/* Check if this device is part of an mpgroup */
if (vdc_port_mpgroup_check(vdev)) {
printk(KERN_WARNING
"VIO: Ignoring extra vdisk port %s",
dev_name(&vdev->dev));
goto err_out_release_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port) {
err = -ENOMEM;
goto err_out_release_mdesc;
}
if (vdev->dev_no >= 26)
snprintf(port->disk_name, sizeof(port->disk_name),