[deliverable/linux.git] / arch / sparc64 / kernel / viohs.c

/* viohs.c: LDOM Virtual I/O handshake helper layer.
 *
 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include <asm/ldc.h>
#include <asm/vio.h>

int vio_ldc_send(struct vio_driver_state *vio, void *data, int len)
{
	int err, limit = 1000;

	err = -EINVAL;
	while (limit-- > 0) {
		err = ldc_write(vio->lp, data, len);
		if (!err || (err != -EAGAIN))
			break;
		udelay(1);
	}

	return err;
}
EXPORT_SYMBOL(vio_ldc_send);

static int send_ctrl(struct vio_driver_state *vio,
		     struct vio_msg_tag *tag, int len)
{
	tag->sid = vio_send_sid(vio);
	return vio_ldc_send(vio, tag, len);
}

static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env)
{
	tag->type = type;
	tag->stype = stype;
	tag->stype_env = stype_env;
}

static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
{
	struct vio_ver_info pkt;

	vio->_local_sid = (u32) sched_clock();

	memset(&pkt, 0, sizeof(pkt));
	init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
	pkt.major = major;
	pkt.minor = minor;
	pkt.dev_class = vio->dev_class;

	viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
	       major, minor, vio->dev_class);

	return send_ctrl(vio, &pkt.tag, sizeof(pkt));
}

static int start_handshake(struct vio_driver_state *vio)
{
	int err;

	viodbg(HS, "START HANDSHAKE\n");

	vio->hs_state = VIO_HS_INVALID;

	err = send_version(vio,
			   vio->ver_table[0].major,
			   vio->ver_table[0].minor);
	if (err < 0)
		return err;

	return 0;
}

static void flush_rx_dring(struct vio_driver_state *vio)
{
	struct vio_dring_state *dr;
	u64 ident;

	BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG));

	dr = &vio->drings[VIO_DRIVER_RX_RING];
	ident = dr->ident;

	BUG_ON(!vio->desc_buf);
	kfree(vio->desc_buf);

	memset(dr, 0, sizeof(*dr));
	dr->ident = ident;
}

void vio_link_state_change(struct vio_driver_state *vio, int event)
{
	if (event == LDC_EVENT_UP) {
		vio->hs_state = VIO_HS_INVALID;

		switch (vio->dev_class) {
		case VDEV_NETWORK:
		case VDEV_NETWORK_SWITCH:
			vio->dr_state = (VIO_DR_STATE_TXREQ |
					 VIO_DR_STATE_RXREQ);
			break;

		case VDEV_DISK:
			vio->dr_state = VIO_DR_STATE_TXREQ;
			break;
		case VDEV_DISK_SERVER:
			vio->dr_state = VIO_DR_STATE_RXREQ;
			break;
		}
		start_handshake(vio);
	} else if (event == LDC_EVENT_RESET) {
		vio->hs_state = VIO_HS_INVALID;

		if (vio->dr_state & VIO_DR_STATE_RXREG)
			flush_rx_dring(vio);

		vio->dr_state = 0x00;
		memset(&vio->ver, 0, sizeof(vio->ver));

		ldc_disconnect(vio->lp);
	}
}
EXPORT_SYMBOL(vio_link_state_change);

static int handshake_failure(struct vio_driver_state *vio)
{
	struct vio_dring_state *dr;

	/* XXX Put policy here...  Perhaps start a timer to fire
	 * XXX in 100 ms, which will bring the link up and retry
	 * XXX the handshake.
	 */

	viodbg(HS, "HANDSHAKE FAILURE\n");

	vio->dr_state &= ~(VIO_DR_STATE_TXREG |
			   VIO_DR_STATE_RXREG);

	dr = &vio->drings[VIO_DRIVER_RX_RING];
	memset(dr, 0, sizeof(*dr));

	kfree(vio->desc_buf);
	vio->desc_buf = NULL;
	vio->desc_buf_len = 0;

	vio->hs_state = VIO_HS_INVALID;

	return -ECONNRESET;
}

static int process_unknown(struct vio_driver_state *vio, void *arg)
{
	struct vio_msg_tag *pkt = arg;

	viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
	       pkt->type, pkt->stype, pkt->stype_env, pkt->sid);

	printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
	       vio->vdev->channel_id);

	ldc_disconnect(vio->lp);

	return -ECONNRESET;
}

static int send_dreg(struct vio_driver_state *vio)
{
	struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
	union {
		struct vio_dring_register pkt;
		char all[sizeof(struct vio_dring_register) +
			 (sizeof(struct ldc_trans_cookie) *
			  dr->ncookies)];
	} u;
	int i;

	memset(&u, 0, sizeof(u));
	init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
	u.pkt.dring_ident = 0;
	u.pkt.num_descr = dr->num_entries;
	u.pkt.descr_size = dr->entry_size;
	u.pkt.options = VIO_TX_DRING;
	u.pkt.num_cookies = dr->ncookies;

	viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
	       "ncookies[%u]\n",
	       u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
	       u.pkt.num_cookies);

	for (i = 0; i < dr->ncookies; i++) {
		u.pkt.cookies[i] = dr->cookies[i];

		viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
		       i,
		       (unsigned long long) u.pkt.cookies[i].cookie_addr,
		       (unsigned long long) u.pkt.cookies[i].cookie_size);
	}

	return send_ctrl(vio, &u.pkt.tag, sizeof(u));
}

static int send_rdx(struct vio_driver_state *vio)
{
	struct vio_rdx pkt;

	memset(&pkt, 0, sizeof(pkt));

	init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);

	viodbg(HS, "SEND RDX INFO\n");

	return send_ctrl(vio, &pkt.tag, sizeof(pkt));
}

static int send_attr(struct vio_driver_state *vio)
{
	return vio->ops->send_attr(vio);
}

static struct vio_version *find_by_major(struct vio_driver_state *vio,
					 u16 major)
{
	struct vio_version *ret = NULL;
	int i;

	for (i = 0; i < vio->ver_table_entries; i++) {
		struct vio_version *v = &vio->ver_table[i];
		if (v->major <= major) {
			ret = v;
			break;
		}
	}
	return ret;
}

static int process_ver_info(struct vio_driver_state *vio,
			    struct vio_ver_info *pkt)
{
	struct vio_version *vap;
	int err;

	viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
	       pkt->major, pkt->minor, pkt->dev_class);

	if (vio->hs_state != VIO_HS_INVALID) {
		/* XXX Perhaps invoke start_handshake? XXX */
		memset(&vio->ver, 0, sizeof(vio->ver));
		vio->hs_state = VIO_HS_INVALID;
	}

	vap = find_by_major(vio, pkt->major);

	vio->_peer_sid = pkt->tag.sid;

	if (!vap) {
		pkt->tag.stype = VIO_SUBTYPE_NACK;
		pkt->major = 0;
		pkt->minor = 0;
		viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
		err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
	} else if (vap->major != pkt->major) {
		pkt->tag.stype = VIO_SUBTYPE_NACK;
		pkt->major = vap->major;
		pkt->minor = vap->minor;
		viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
		       pkt->major, pkt->minor);
		err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
	} else {
		struct vio_version ver = {
			.major = pkt->major,
			.minor = pkt->minor,
		};
		if (ver.minor > vap->minor)
			ver.minor = vap->minor;
		pkt->minor = ver.minor;
		pkt->tag.stype = VIO_SUBTYPE_ACK;
		viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
		       pkt->major, pkt->minor);
		err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
		if (err > 0) {
			vio->ver = ver;
			vio->hs_state = VIO_HS_GOTVERS;
		}
	}
	if (err < 0)
		return handshake_failure(vio);

	return 0;
}

static int process_ver_ack(struct vio_driver_state *vio,
			   struct vio_ver_info *pkt)
{
	viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
	       pkt->major, pkt->minor, pkt->dev_class);

	if (vio->hs_state & VIO_HS_GOTVERS) {
		if (vio->ver.major != pkt->major ||
		    vio->ver.minor != pkt->minor) {
			pkt->tag.stype = VIO_SUBTYPE_NACK;
			(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
			return handshake_failure(vio);
		}
	} else {
		vio->ver.major = pkt->major;
		vio->ver.minor = pkt->minor;
		vio->hs_state = VIO_HS_GOTVERS;
	}

	switch (vio->dev_class) {
	case VDEV_NETWORK:
	case VDEV_DISK:
		if (send_attr(vio) < 0)
			return handshake_failure(vio);
		break;

	default:
		break;
	}

	return 0;
}

static int process_ver_nack(struct vio_driver_state *vio,
			    struct vio_ver_info *pkt)
{
	struct vio_version *nver;

	viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
	       pkt->major, pkt->minor, pkt->dev_class);

	if ((pkt->major == 0 && pkt->minor == 0) ||
	    !(nver = find_by_major(vio, pkt->major)))
		return handshake_failure(vio);

	if (send_version(vio, nver->major, nver->minor) < 0)
		return handshake_failure(vio);

	return 0;
}

static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt)
{
	switch (pkt->tag.stype) {
	case VIO_SUBTYPE_INFO:
		return process_ver_info(vio, pkt);

	case VIO_SUBTYPE_ACK:
		return process_ver_ack(vio, pkt);

	case VIO_SUBTYPE_NACK:
		return process_ver_nack(vio, pkt);

	default:
		return handshake_failure(vio);
	};
}

static int process_attr(struct vio_driver_state *vio, void *pkt)
{
	int err;

	if (!(vio->hs_state & VIO_HS_GOTVERS))
		return handshake_failure(vio);

	err = vio->ops->handle_attr(vio, pkt);
	if (err < 0) {
		return handshake_failure(vio);
	} else {
		vio->hs_state |= VIO_HS_GOT_ATTR;

		if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
		    !(vio->hs_state & VIO_HS_SENT_DREG)) {
			if (send_dreg(vio) < 0)
				return handshake_failure(vio);

			vio->hs_state |= VIO_HS_SENT_DREG;
		}
	}
	return 0;
}

static int all_drings_registered(struct vio_driver_state *vio)
{
	int need_rx, need_tx;

	need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ);
	need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);

	if (need_rx &&
	    !(vio->dr_state & VIO_DR_STATE_RXREG))
		return 0;

	if (need_tx &&
	    !(vio->dr_state & VIO_DR_STATE_TXREG))
		return 0;

	return 1;
}

static int process_dreg_info(struct vio_driver_state *vio,
			     struct vio_dring_register *pkt)
{
	struct vio_dring_state *dr;
	int i, len;

	viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
	       "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
	       (unsigned long long) pkt->dring_ident,
	       pkt->num_descr, pkt->descr_size, pkt->options,
	       pkt->num_cookies);

	if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
		goto send_nack;

	if (vio->dr_state & VIO_DR_STATE_RXREG)
		goto send_nack;

	BUG_ON(vio->desc_buf);

	vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
	if (!vio->desc_buf)
		goto send_nack;

	vio->desc_buf_len = pkt->descr_size;

	dr = &vio->drings[VIO_DRIVER_RX_RING];

	dr->num_entries = pkt->num_descr;
	dr->entry_size = pkt->descr_size;
	dr->ncookies = pkt->num_cookies;
	for (i = 0; i < dr->ncookies; i++) {
		dr->cookies[i] = pkt->cookies[i];

		viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
		       i,
		       (unsigned long long)
		       pkt->cookies[i].cookie_addr,
		       (unsigned long long)
		       pkt->cookies[i].cookie_size);
	}

	pkt->tag.stype = VIO_SUBTYPE_ACK;
	pkt->dring_ident = ++dr->ident;

	viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n",
	       (unsigned long long) pkt->dring_ident);

	len = (sizeof(*pkt) +
	       (dr->ncookies * sizeof(struct ldc_trans_cookie)));
	if (send_ctrl(vio, &pkt->tag, len) < 0)
		goto send_nack;

	vio->dr_state |= VIO_DR_STATE_RXREG;

	return 0;

send_nack:
	pkt->tag.stype = VIO_SUBTYPE_NACK;
	viodbg(HS, "SEND DRING_REG NACK\n");
	(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));

	return handshake_failure(vio);
}

static int process_dreg_ack(struct vio_driver_state *vio,
			    struct vio_dring_register *pkt)
{
	struct vio_dring_state *dr;

	viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
	       "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
	       (unsigned long long) pkt->dring_ident,
	       pkt->num_descr, pkt->descr_size, pkt->options,
	       pkt->num_cookies);

	dr = &vio->drings[VIO_DRIVER_TX_RING];

	if (!(vio->dr_state & VIO_DR_STATE_TXREQ))
		return handshake_failure(vio);

	dr->ident = pkt->dring_ident;
	vio->dr_state |= VIO_DR_STATE_TXREG;

	if (all_drings_registered(vio)) {
		if (send_rdx(vio) < 0)
			return handshake_failure(vio);
		vio->hs_state = VIO_HS_SENT_RDX;
	}
	return 0;
}

static int process_dreg_nack(struct vio_driver_state *vio,
			     struct vio_dring_register *pkt)
{
	viodbg(HS, "GOT DRING_REG NACK ident[%llx] "
	       "ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
	       (unsigned long long) pkt->dring_ident,
	       pkt->num_descr, pkt->descr_size, pkt->options,
	       pkt->num_cookies);

	return handshake_failure(vio);
}

static int process_dreg(struct vio_driver_state *vio,
			struct vio_dring_register *pkt)
{
	if (!(vio->hs_state & VIO_HS_GOTVERS))
		return handshake_failure(vio);

	switch (pkt->tag.stype) {
	case VIO_SUBTYPE_INFO:
		return process_dreg_info(vio, pkt);

	case VIO_SUBTYPE_ACK:
		return process_dreg_ack(vio, pkt);

	case VIO_SUBTYPE_NACK:
		return process_dreg_nack(vio, pkt);

	default:
		return handshake_failure(vio);
	}
}

static int process_dunreg(struct vio_driver_state *vio,
			  struct vio_dring_unregister *pkt)
{
	struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING];

	viodbg(HS, "GOT DRING_UNREG\n");

	if (pkt->dring_ident != dr->ident)
		return 0;

	vio->dr_state &= ~VIO_DR_STATE_RXREG;

	memset(dr, 0, sizeof(*dr));

	kfree(vio->desc_buf);
	vio->desc_buf = NULL;
	vio->desc_buf_len = 0;

	return 0;
}

static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
	viodbg(HS, "GOT RDX INFO\n");

	pkt->tag.stype = VIO_SUBTYPE_ACK;
	viodbg(HS, "SEND RDX ACK\n");
	if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0)
		return handshake_failure(vio);

	vio->hs_state |= VIO_HS_SENT_RDX_ACK;
	return 0;
}

static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
	viodbg(HS, "GOT RDX ACK\n");

	if (!(vio->hs_state & VIO_HS_SENT_RDX))
		return handshake_failure(vio);

	vio->hs_state |= VIO_HS_GOT_RDX_ACK;
	return 0;
}

static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
	viodbg(HS, "GOT RDX NACK\n");

	return handshake_failure(vio);
}

static int process_rdx(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
	if (!all_drings_registered(vio))
		handshake_failure(vio);

	switch (pkt->tag.stype) {
	case VIO_SUBTYPE_INFO:
		return process_rdx_info(vio, pkt);

	case VIO_SUBTYPE_ACK:
		return process_rdx_ack(vio, pkt);

	case VIO_SUBTYPE_NACK:
		return process_rdx_nack(vio, pkt);

	default:
		return handshake_failure(vio);
	}
}

int vio_control_pkt_engine(struct vio_driver_state *vio, void *pkt)
{
	struct vio_msg_tag *tag = pkt;
	u8 prev_state = vio->hs_state;
	int err;

	switch (tag->stype_env) {
	case VIO_VER_INFO:
		err = process_ver(vio, pkt);
		break;

	case VIO_ATTR_INFO:
		err = process_attr(vio, pkt);
		break;

	case VIO_DRING_REG:
		err = process_dreg(vio, pkt);
		break;

	case VIO_DRING_UNREG:
		err = process_dunreg(vio, pkt);
		break;

	case VIO_RDX:
		err = process_rdx(vio, pkt);
		break;

	default:
		err = process_unknown(vio, pkt);
		break;
	}
	if (!err &&
	    vio->hs_state != prev_state &&
	    (vio->hs_state & VIO_HS_COMPLETE))
		vio->ops->handshake_complete(vio);

	return err;
}
EXPORT_SYMBOL(vio_control_pkt_engine);

void vio_conn_reset(struct vio_driver_state *vio)
{
}
EXPORT_SYMBOL(vio_conn_reset);

/* The issue is that the Solaris virtual disk server just mirrors the
 * SID values it gets from the client peer.  So we work around that
 * here in vio_{validate,send}_sid() so that the drivers don't need
 * to be aware of this crap.
 */
int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp)
{
	u32 sid;

	/* Always let VERSION+INFO packets through unchecked, they
	 * define the new SID.
	 */
	if (tp->type == VIO_TYPE_CTRL &&
	    tp->stype == VIO_SUBTYPE_INFO &&
	    tp->stype_env == VIO_VER_INFO)
		return 0;

	/* Ok, now figure out which SID to use.  */
	switch (vio->dev_class) {
	case VDEV_NETWORK:
	case VDEV_NETWORK_SWITCH:
	case VDEV_DISK_SERVER:
	default:
		sid = vio->_peer_sid;
		break;

	case VDEV_DISK:
		sid = vio->_local_sid;
		break;
	}

	if (sid == tp->sid)
		return 0;
	viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n",
	       tp->sid, vio->_peer_sid, vio->_local_sid);
	return -EINVAL;
}
EXPORT_SYMBOL(vio_validate_sid);

u32 vio_send_sid(struct vio_driver_state *vio)
{
	switch (vio->dev_class) {
	case VDEV_NETWORK:
	case VDEV_NETWORK_SWITCH:
	case VDEV_DISK:
	default:
		return vio->_local_sid;

	case VDEV_DISK_SERVER:
		return vio->_peer_sid;
	}
}
EXPORT_SYMBOL(vio_send_sid);

extern int vio_ldc_alloc(struct vio_driver_state *vio,
			 struct ldc_channel_config *base_cfg,
			 void *event_arg)
{
	struct ldc_channel_config cfg = *base_cfg;
	struct ldc_channel *lp;

	cfg.tx_irq = vio->vdev->tx_irq;
	cfg.rx_irq = vio->vdev->rx_irq;

	lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg);
	if (IS_ERR(lp))
		return PTR_ERR(lp);

	vio->lp = lp;

	return 0;
}
EXPORT_SYMBOL(vio_ldc_alloc);

void vio_ldc_free(struct vio_driver_state *vio)
{
	ldc_free(vio->lp);
	vio->lp = NULL;

	kfree(vio->desc_buf);
	vio->desc_buf = NULL;
	vio->desc_buf_len = 0;
}
EXPORT_SYMBOL(vio_ldc_free);

void vio_port_up(struct vio_driver_state *vio)
{
	unsigned long flags;
	int err, state;

	spin_lock_irqsave(&vio->lock, flags);

	state = ldc_state(vio->lp);

	err = 0;
	if (state == LDC_STATE_INIT) {
		err = ldc_bind(vio->lp, vio->name);
		if (err)
			printk(KERN_WARNING "%s: Port %lu bind failed, "
			       "err=%d\n",
			       vio->name, vio->vdev->channel_id, err);
	}

	if (!err) {
		err = ldc_connect(vio->lp);
		if (err)
			printk(KERN_WARNING "%s: Port %lu connect failed, "
			       "err=%d\n",
			       vio->name, vio->vdev->channel_id, err);
	}
	if (err) {
		unsigned long expires = jiffies + HZ;

		expires = round_jiffies(expires);
		mod_timer(&vio->timer, expires);
	}

	spin_unlock_irqrestore(&vio->lock, flags);
}
EXPORT_SYMBOL(vio_port_up);

static void vio_port_timer(unsigned long _arg)
{
	struct vio_driver_state *vio = (struct vio_driver_state *) _arg;

	vio_port_up(vio);
}

int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
		    u8 dev_class, struct vio_version *ver_table,
		    int ver_table_size, struct vio_driver_ops *ops,
		    char *name)
{
	switch (dev_class) {
	case VDEV_NETWORK:
	case VDEV_NETWORK_SWITCH:
	case VDEV_DISK:
	case VDEV_DISK_SERVER:
		break;

	default:
		return -EINVAL;
	}

	if (!ops->send_attr ||
	    !ops->handle_attr ||
	    !ops->handshake_complete)
		return -EINVAL;

	if (!ver_table || ver_table_size < 0)
		return -EINVAL;

	if (!name)
		return -EINVAL;

	spin_lock_init(&vio->lock);

	vio->name = name;

	vio->dev_class = dev_class;
	vio->vdev = vdev;

	vio->ver_table = ver_table;
	vio->ver_table_entries = ver_table_size;

	vio->ops = ops;

	setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio);

	return 0;
}
EXPORT_SYMBOL(vio_driver_init);
Commit	Line	Data
e53e97ce DM	1	/* viohs.c: LDOM Virtual I/O handshake helper layer.
	2	*
	3	* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
	4	*/
	5
	6	#include <linux/kernel.h>
	7	#include <linux/module.h>
	8	#include <linux/string.h>
	9	#include <linux/delay.h>
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12
	13	#include <asm/ldc.h>
	14	#include <asm/vio.h>
	15
	16	int vio_ldc_send(struct vio_driver_state vio, void data, int len)
	17	{
	18	int err, limit = 1000;
	19
	20	err = -EINVAL;
	21	while (limit-- > 0) {
	22	err = ldc_write(vio->lp, data, len);
	23	if (!err \|\| (err != -EAGAIN))
	24	break;
	25	udelay(1);
	26	}
	27
	28	return err;
	29	}
	30	EXPORT_SYMBOL(vio_ldc_send);
	31
	32	static int send_ctrl(struct vio_driver_state *vio,
	33	struct vio_msg_tag *tag, int len)
	34	{
	35	tag->sid = vio_send_sid(vio);
	36	return vio_ldc_send(vio, tag, len);
	37	}
	38
	39	static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env)
	40	{
	41	tag->type = type;
	42	tag->stype = stype;
	43	tag->stype_env = stype_env;
	44	}
	45
	46	static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
	47	{
	48	struct vio_ver_info pkt;
	49
	50	vio->_local_sid = (u32) sched_clock();
	51
	52	memset(&pkt, 0, sizeof(pkt));
	53	init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
	54	pkt.major = major;
	55	pkt.minor = minor;
	56	pkt.dev_class = vio->dev_class;
	57
	58	viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
	59	major, minor, vio->dev_class);
	60
	61	return send_ctrl(vio, &pkt.tag, sizeof(pkt));
	62	}
	63
	64	static int start_handshake(struct vio_driver_state *vio)
65	{
66	int err;
67
68	viodbg(HS, "START HANDSHAKE\n");
69
70	vio->hs_state = VIO_HS_INVALID;
71
72	err = send_version(vio,
73	vio->ver_table[0].major,
74	vio->ver_table[0].minor);
75	if (err < 0)
76	return err;
77
78	return 0;
79	}
80
a4cd1845 DM	81	static void flush_rx_dring(struct vio_driver_state *vio)
	82	{
	83	struct vio_dring_state *dr;
	84	u64 ident;
	85
	86	BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG));
	87
	88	dr = &vio->drings[VIO_DRIVER_RX_RING];
	89	ident = dr->ident;
	90
	91	BUG_ON(!vio->desc_buf);
	92	kfree(vio->desc_buf);
	93
	94	memset(dr, 0, sizeof(*dr));
	95	dr->ident = ident;
	96	}
	97
e53e97ce DM	98	void vio_link_state_change(struct vio_driver_state *vio, int event)
	99	{
	100	if (event == LDC_EVENT_UP) {
	101	vio->hs_state = VIO_HS_INVALID;
	102
	103	switch (vio->dev_class) {
	104	case VDEV_NETWORK:
	105	case VDEV_NETWORK_SWITCH:
	106	vio->dr_state = (VIO_DR_STATE_TXREQ \|
	107	VIO_DR_STATE_RXREQ);
	108	break;
	109
	110	case VDEV_DISK:
	111	vio->dr_state = VIO_DR_STATE_TXREQ;
	112	break;
	113	case VDEV_DISK_SERVER:
	114	vio->dr_state = VIO_DR_STATE_RXREQ;
	115	break;
	116	}
	117	start_handshake(vio);
a4cd1845 DM	118	} else if (event == LDC_EVENT_RESET) {
	119	vio->hs_state = VIO_HS_INVALID;
	120
	121	if (vio->dr_state & VIO_DR_STATE_RXREG)
	122	flush_rx_dring(vio);
	123
	124	vio->dr_state = 0x00;
	125	memset(&vio->ver, 0, sizeof(vio->ver));
	126
	127	ldc_disconnect(vio->lp);
e53e97ce DM	128	}
	129	}
	130	EXPORT_SYMBOL(vio_link_state_change);
	131
	132	static int handshake_failure(struct vio_driver_state *vio)
	133	{
	134	struct vio_dring_state *dr;
	135
	136	/* XXX Put policy here... Perhaps start a timer to fire
	137	* XXX in 100 ms, which will bring the link up and retry
	138	* XXX the handshake.
	139	*/
	140
	141	viodbg(HS, "HANDSHAKE FAILURE\n");
	142
	143	vio->dr_state &= ~(VIO_DR_STATE_TXREG \|
	144	VIO_DR_STATE_RXREG);
	145
	146	dr = &vio->drings[VIO_DRIVER_RX_RING];
	147	memset(dr, 0, sizeof(*dr));
	148
	149	kfree(vio->desc_buf);
	150	vio->desc_buf = NULL;
	151	vio->desc_buf_len = 0;
	152
	153	vio->hs_state = VIO_HS_INVALID;
	154
	155	return -ECONNRESET;
	156	}
	157
	158	static int process_unknown(struct vio_driver_state vio, void arg)
	159	{
	160	struct vio_msg_tag *pkt = arg;
	161
	162	viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
	163	pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
	164
	165	printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
43fdf274	166	vio->vdev->channel_id);
e53e97ce DM	167
	168	ldc_disconnect(vio->lp);
	169
	170	return -ECONNRESET;
	171	}
	172
	173	static int send_dreg(struct vio_driver_state *vio)
	174	{
	175	struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
	176	union {
	177	struct vio_dring_register pkt;
	178	char all[sizeof(struct vio_dring_register) +
	179	(sizeof(struct ldc_trans_cookie) *
	180	dr->ncookies)];
	181	} u;
	182	int i;
	183
	184	memset(&u, 0, sizeof(u));
	185	init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
	186	u.pkt.dring_ident = 0;
	187	u.pkt.num_descr = dr->num_entries;
	188	u.pkt.descr_size = dr->entry_size;
	189	u.pkt.options = VIO_TX_DRING;
	190	u.pkt.num_cookies = dr->ncookies;
	191
	192	viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
	193	"ncookies[%u]\n",
	194	u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
	195	u.pkt.num_cookies);
	196
	197	for (i = 0; i < dr->ncookies; i++) {
	198	u.pkt.cookies[i] = dr->cookies[i];
	199
	200	viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
	201	i,
	202	(unsigned long long) u.pkt.cookies[i].cookie_addr,
	203	(unsigned long long) u.pkt.cookies[i].cookie_size);
	204	}
	205
	206	return send_ctrl(vio, &u.pkt.tag, sizeof(u));
	207	}
	208
	209	static int send_rdx(struct vio_driver_state *vio)
	210	{
	211	struct vio_rdx pkt;
	212
	213	memset(&pkt, 0, sizeof(pkt));
	214
	215	init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);
	216
	217	viodbg(HS, "SEND RDX INFO\n");
	218
	219	return send_ctrl(vio, &pkt.tag, sizeof(pkt));
	220	}
	221
	222	static int send_attr(struct vio_driver_state *vio)
	223	{
	224	return vio->ops->send_attr(vio);
	225	}
	226
	227	static struct vio_version find_by_major(struct vio_driver_state vio,
	228	u16 major)
	229	{
	230	struct vio_version *ret = NULL;
231	int i;
232
233	for (i = 0; i < vio->ver_table_entries; i++) {
234	struct vio_version *v = &vio->ver_table[i];
235	if (v->major <= major) {
236	ret = v;
237	break;
238	}
239	}
240	return ret;
241	}
242
243	static int process_ver_info(struct vio_driver_state *vio,
244	struct vio_ver_info *pkt)
245	{
246	struct vio_version *vap;
247	int err;
248
249	viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
250	pkt->major, pkt->minor, pkt->dev_class);
251
252	if (vio->hs_state != VIO_HS_INVALID) {
253	/* XXX Perhaps invoke start_handshake? XXX */
254	memset(&vio->ver, 0, sizeof(vio->ver));
255	vio->hs_state = VIO_HS_INVALID;
256	}
257
258	vap = find_by_major(vio, pkt->major);
259
260	vio->_peer_sid = pkt->tag.sid;
261
262	if (!vap) {
263	pkt->tag.stype = VIO_SUBTYPE_NACK;
264	pkt->major = 0;
265	pkt->minor = 0;
266	viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
267	err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
268	} else if (vap->major != pkt->major) {
269	pkt->tag.stype = VIO_SUBTYPE_NACK;
270	pkt->major = vap->major;
271	pkt->minor = vap->minor;
272	viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
273	pkt->major, pkt->minor);
274	err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
275	} else {
276	struct vio_version ver = {
277	.major = pkt->major,
278	.minor = pkt->minor,
279	};
280	if (ver.minor > vap->minor)
281	ver.minor = vap->minor;
282	pkt->minor = ver.minor;
283	pkt->tag.stype = VIO_SUBTYPE_ACK;
284	viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
285	pkt->major, pkt->minor);
286	err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
287	if (err > 0) {
288	vio->ver = ver;
289	vio->hs_state = VIO_HS_GOTVERS;
290	}
291	}
292	if (err < 0)
293	return handshake_failure(vio);
294
295	return 0;
296	}
297
298	static int process_ver_ack(struct vio_driver_state *vio,
299	struct vio_ver_info *pkt)
300	{
301	viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
302	pkt->major, pkt->minor, pkt->dev_class);
303
304	if (vio->hs_state & VIO_HS_GOTVERS) {
305	if (vio->ver.major != pkt->major \|\|
306	vio->ver.minor != pkt->minor) {
307	pkt->tag.stype = VIO_SUBTYPE_NACK;
308	(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
309	return handshake_failure(vio);
310	}
311	} else {
312	vio->ver.major = pkt->major;
313	vio->ver.minor = pkt->minor;
314	vio->hs_state = VIO_HS_GOTVERS;
315	}
316
317	switch (vio->dev_class) {
318	case VDEV_NETWORK:
319	case VDEV_DISK:
320	if (send_attr(vio) < 0)
321	return handshake_failure(vio);
322	break;
323
324	default:
325	break;
326	}
327
328	return 0;
329	}
330
331	static int process_ver_nack(struct vio_driver_state *vio,
332	struct vio_ver_info *pkt)
333	{
334	struct vio_version *nver;
335
336	viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
337	pkt->major, pkt->minor, pkt->dev_class);
338
339	if ((pkt->major == 0 && pkt->minor == 0) \|\|
340	!(nver = find_by_major(vio, pkt->major)))
341	return handshake_failure(vio);
342
343	if (send_version(vio, nver->major, nver->minor) < 0)
344	return handshake_failure(vio);
345
346	return 0;
347	}
348
349	static int process_ver(struct vio_driver_state vio, struct vio_ver_info pkt)
350	{
351	switch (pkt->tag.stype) {
352	case VIO_SUBTYPE_INFO:
353	return process_ver_info(vio, pkt);
354
355	case VIO_SUBTYPE_ACK:
356	return process_ver_ack(vio, pkt);
357
358	case VIO_SUBTYPE_NACK:
359	return process_ver_nack(vio, pkt);
360
361	default:
362	return handshake_failure(vio);
363	};
364	}
365
366	static int process_attr(struct vio_driver_state vio, void pkt)
367	{
368	int err;
369
370	if (!(vio->hs_state & VIO_HS_GOTVERS))
371	return handshake_failure(vio);
372
373	err = vio->ops->handle_attr(vio, pkt);
374	if (err < 0) {
375	return handshake_failure(vio);
376	} else {
377	vio->hs_state \|= VIO_HS_GOT_ATTR;
378
379	if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
380	!(vio->hs_state & VIO_HS_SENT_DREG)) {
381	if (send_dreg(vio) < 0)
382	return handshake_failure(vio);
383
384	vio->hs_state \|= VIO_HS_SENT_DREG;
385	}
386	}
387	return 0;
388	}
389
390	static int all_drings_registered(struct vio_driver_state *vio)
391	{
392	int need_rx, need_tx;
393
394	need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ);
395	need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);
396
397	if (need_rx &&
398	!(vio->dr_state & VIO_DR_STATE_RXREG))
399	return 0;
400
401	if (need_tx &&
402	!(vio->dr_state & VIO_DR_STATE_TXREG))
403	return 0;
404
405	return 1;
406	}
407
408	static int process_dreg_info(struct vio_driver_state *vio,
409	struct vio_dring_register *pkt)
410	{
411	struct vio_dring_state *dr;
412	int i, len;
413
414	viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
415	"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
416	(unsigned long long) pkt->dring_ident,
417	pkt->num_descr, pkt->descr_size, pkt->options,
418	pkt->num_cookies);
419
420	if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
421	goto send_nack;
422
423	if (vio->dr_state & VIO_DR_STATE_RXREG)
424	goto send_nack;
425
a4cd1845 DM	426	BUG_ON(vio->desc_buf);
a4cd1845 DM	427
e53e97ce DM	428	vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
	429	if (!vio->desc_buf)
	430	goto send_nack;
	431
	432	vio->desc_buf_len = pkt->descr_size;
	433
	434	dr = &vio->drings[VIO_DRIVER_RX_RING];
	435
	436	dr->num_entries = pkt->num_descr;
	437	dr->entry_size = pkt->descr_size;
	438	dr->ncookies = pkt->num_cookies;
	439	for (i = 0; i < dr->ncookies; i++) {
	440	dr->cookies[i] = pkt->cookies[i];
	441
	442	viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
	443	i,
	444	(unsigned long long)
	445	pkt->cookies[i].cookie_addr,
	446	(unsigned long long)
	447	pkt->cookies[i].cookie_size);
	448	}
	449
	450	pkt->tag.stype = VIO_SUBTYPE_ACK;
	451	pkt->dring_ident = ++dr->ident;
	452
	453	viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n",
	454	(unsigned long long) pkt->dring_ident);
	455
	456	len = (sizeof(*pkt) +
	457	(dr->ncookies * sizeof(struct ldc_trans_cookie)));
	458	if (send_ctrl(vio, &pkt->tag, len) < 0)
	459	goto send_nack;
	460
	461	vio->dr_state \|= VIO_DR_STATE_RXREG;
	462
	463	return 0;
	464
	465	send_nack:
	466	pkt->tag.stype = VIO_SUBTYPE_NACK;
	467	viodbg(HS, "SEND DRING_REG NACK\n");
	468	(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
	469
	470	return handshake_failure(vio);
	471	}
	472
	473	static int process_dreg_ack(struct vio_driver_state *vio,
	474	struct vio_dring_register *pkt)
	475	{
	476	struct vio_dring_state *dr;
	477
	478	viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
	479	"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
	480	(unsigned long long) pkt->dring_ident,
	481	pkt->num_descr, pkt->descr_size, pkt->options,
	482	pkt->num_cookies);
	483
	484	dr = &vio->drings[VIO_DRIVER_TX_RING];
	485
	486	if (!(vio->dr_state & VIO_DR_STATE_TXREQ))
	487	return handshake_failure(vio);
	488
	489	dr->ident = pkt->dring_ident;
	490	vio->dr_state \|= VIO_DR_STATE_TXREG;
	491
492	if (all_drings_registered(vio)) {
493	if (send_rdx(vio) < 0)
494	return handshake_failure(vio);
495	vio->hs_state = VIO_HS_SENT_RDX;
496	}
497	return 0;
498	}
499
500	static int process_dreg_nack(struct vio_driver_state *vio,
501	struct vio_dring_register *pkt)
502	{
503	viodbg(HS, "GOT DRING_REG NACK ident[%llx] "
504	"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
505	(unsigned long long) pkt->dring_ident,
506	pkt->num_descr, pkt->descr_size, pkt->options,
507	pkt->num_cookies);
508
509	return handshake_failure(vio);
510	}
511
512	static int process_dreg(struct vio_driver_state *vio,
513	struct vio_dring_register *pkt)
514	{
515	if (!(vio->hs_state & VIO_HS_GOTVERS))
516	return handshake_failure(vio);
517
518	switch (pkt->tag.stype) {
519	case VIO_SUBTYPE_INFO:
520	return process_dreg_info(vio, pkt);
521
522	case VIO_SUBTYPE_ACK:
523	return process_dreg_ack(vio, pkt);
524
525	case VIO_SUBTYPE_NACK:
526	return process_dreg_nack(vio, pkt);
527
528	default:
529	return handshake_failure(vio);
530	}
531	}
532
533	static int process_dunreg(struct vio_driver_state *vio,
534	struct vio_dring_unregister *pkt)
535	{
536	struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING];
537
538	viodbg(HS, "GOT DRING_UNREG\n");
539
540	if (pkt->dring_ident != dr->ident)
541	return 0;
542
543	vio->dr_state &= ~VIO_DR_STATE_RXREG;
544
545	memset(dr, 0, sizeof(*dr));
546
547	kfree(vio->desc_buf);
548	vio->desc_buf = NULL;
549	vio->desc_buf_len = 0;
550
551	return 0;
552	}
553
554	static int process_rdx_info(struct vio_driver_state vio, struct vio_rdx pkt)
555	{
556	viodbg(HS, "GOT RDX INFO\n");
557
558	pkt->tag.stype = VIO_SUBTYPE_ACK;
559	viodbg(HS, "SEND RDX ACK\n");
560	if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0)
561	return handshake_failure(vio);
562
563	vio->hs_state \|= VIO_HS_SENT_RDX_ACK;
564	return 0;
565	}
566
567	static int process_rdx_ack(struct vio_driver_state vio, struct vio_rdx pkt)
568	{
569	viodbg(HS, "GOT RDX ACK\n");
570
571	if (!(vio->hs_state & VIO_HS_SENT_RDX))
572	return handshake_failure(vio);
573
574	vio->hs_state \|= VIO_HS_GOT_RDX_ACK;
575	return 0;
576	}
577
578	static int process_rdx_nack(struct vio_driver_state vio, struct vio_rdx pkt)
579	{
580	viodbg(HS, "GOT RDX NACK\n");
581
582	return handshake_failure(vio);
583	}
584
585	static int process_rdx(struct vio_driver_state vio, struct vio_rdx pkt)
586	{
587	if (!all_drings_registered(vio))
588	handshake_failure(vio);
589
590	switch (pkt->tag.stype) {
591	case VIO_SUBTYPE_INFO:
592	return process_rdx_info(vio, pkt);
593
594	case VIO_SUBTYPE_ACK:
595	return process_rdx_ack(vio, pkt);
596
597	case VIO_SUBTYPE_NACK:
598	return process_rdx_nack(vio, pkt);
599
600	default:
601	return handshake_failure(vio);
602	}
603	}
604
605	int vio_control_pkt_engine(struct vio_driver_state vio, void pkt)
606	{
607	struct vio_msg_tag *tag = pkt;
608	u8 prev_state = vio->hs_state;
609	int err;
610
611	switch (tag->stype_env) {
612	case VIO_VER_INFO:
613	err = process_ver(vio, pkt);
614	break;
615
616	case VIO_ATTR_INFO:
617	err = process_attr(vio, pkt);
618	break;
619
620	case VIO_DRING_REG:
621	err = process_dreg(vio, pkt);
622	break;
623
624	case VIO_DRING_UNREG:
625	err = process_dunreg(vio, pkt);
626	break;
627
628	case VIO_RDX:
629	err = process_rdx(vio, pkt);
630	break;
631
632	default:
633	err = process_unknown(vio, pkt);
634	break;
635	}
636	if (!err &&
637	vio->hs_state != prev_state &&
638	(vio->hs_state & VIO_HS_COMPLETE))
639	vio->ops->handshake_complete(vio);
640
641	return err;
642	}
643	EXPORT_SYMBOL(vio_control_pkt_engine);
644
645	void vio_conn_reset(struct vio_driver_state *vio)
646	{
647	}
648	EXPORT_SYMBOL(vio_conn_reset);
649
650	/* The issue is that the Solaris virtual disk server just mirrors the
651	* SID values it gets from the client peer. So we work around that
652	* here in vio_{validate,send}_sid() so that the drivers don't need
653	* to be aware of this crap.
654	*/
655	int vio_validate_sid(struct vio_driver_state vio, struct vio_msg_tag tp)
656	{
657	u32 sid;
658
659	/* Always let VERSION+INFO packets through unchecked, they
660	* define the new SID.
661	*/
662	if (tp->type == VIO_TYPE_CTRL &&
663	tp->stype == VIO_SUBTYPE_INFO &&
664	tp->stype_env == VIO_VER_INFO)
665	return 0;
666
667	/* Ok, now figure out which SID to use. */
668	switch (vio->dev_class) {
669	case VDEV_NETWORK:
670	case VDEV_NETWORK_SWITCH:
671	case VDEV_DISK_SERVER:
672	default:
673	sid = vio->_peer_sid;
674	break;
675
676	case VDEV_DISK:
677	sid = vio->_local_sid;
678	break;
679	}
680
681	if (sid == tp->sid)
682	return 0;
683	viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n",
684	tp->sid, vio->_peer_sid, vio->_local_sid);
685	return -EINVAL;
686	}
687	EXPORT_SYMBOL(vio_validate_sid);
688
689	u32 vio_send_sid(struct vio_driver_state *vio)
690	{
691	switch (vio->dev_class) {
692	case VDEV_NETWORK:
693	case VDEV_NETWORK_SWITCH:
694	case VDEV_DISK:
695	default:
696	return vio->_local_sid;
697
698	case VDEV_DISK_SERVER:
699	return vio->_peer_sid;
700	}
701	}
702	EXPORT_SYMBOL(vio_send_sid);
703
704	extern int vio_ldc_alloc(struct vio_driver_state *vio,
705	struct ldc_channel_config *base_cfg,
706	void *event_arg)
707	{
708	struct ldc_channel_config cfg = *base_cfg;
709	struct ldc_channel *lp;
e53e97ce	710
43fdf274 DM	711	cfg.tx_irq = vio->vdev->tx_irq;
43fdf274 DM	712	cfg.rx_irq = vio->vdev->rx_irq;
e53e97ce	713
43fdf274	714	lp = ldc_alloc(vio->vdev->channel_id, &cfg, event_arg);
e53e97ce DM	715	if (IS_ERR(lp))
	716	return PTR_ERR(lp);
	717
	718	vio->lp = lp;
	719
	720	return 0;
	721	}
	722	EXPORT_SYMBOL(vio_ldc_alloc);
	723
	724	void vio_ldc_free(struct vio_driver_state *vio)
	725	{
	726	ldc_free(vio->lp);
	727	vio->lp = NULL;
	728
	729	kfree(vio->desc_buf);
	730	vio->desc_buf = NULL;
	731	vio->desc_buf_len = 0;
	732	}
	733	EXPORT_SYMBOL(vio_ldc_free);
	734
	735	void vio_port_up(struct vio_driver_state *vio)
	736	{
	737	unsigned long flags;
	738	int err, state;
	739
	740	spin_lock_irqsave(&vio->lock, flags);
	741
	742	state = ldc_state(vio->lp);
	743
	744	err = 0;
	745	if (state == LDC_STATE_INIT) {
133f09a1	746	err = ldc_bind(vio->lp, vio->name);
e53e97ce DM	747	if (err)
	748	printk(KERN_WARNING "%s: Port %lu bind failed, "
	749	"err=%d\n",
43fdf274	750	vio->name, vio->vdev->channel_id, err);
e53e97ce DM	751	}
	752
	753	if (!err) {
	754	err = ldc_connect(vio->lp);
	755	if (err)
	756	printk(KERN_WARNING "%s: Port %lu connect failed, "
	757	"err=%d\n",
43fdf274	758	vio->name, vio->vdev->channel_id, err);
e53e97ce DM	759	}
	760	if (err) {
	761	unsigned long expires = jiffies + HZ;
	762
	763	expires = round_jiffies(expires);
	764	mod_timer(&vio->timer, expires);
	765	}
	766
	767	spin_unlock_irqrestore(&vio->lock, flags);
	768	}
	769	EXPORT_SYMBOL(vio_port_up);
	770
	771	static void vio_port_timer(unsigned long _arg)
	772	{
	773	struct vio_driver_state vio = (struct vio_driver_state ) _arg;
	774
	775	vio_port_up(vio);
	776	}
	777
	778	int vio_driver_init(struct vio_driver_state vio, struct vio_dev vdev,
43fdf274 DM	779	u8 dev_class, struct vio_version *ver_table,
	780	int ver_table_size, struct vio_driver_ops *ops,
	781	char *name)
e53e97ce DM	782	{
	783	switch (dev_class) {
	784	case VDEV_NETWORK:
	785	case VDEV_NETWORK_SWITCH:
	786	case VDEV_DISK:
	787	case VDEV_DISK_SERVER:
	788	break;
	789
	790	default:
	791	return -EINVAL;
	792	}
	793
	794	if (!ops->send_attr \|\|
	795	!ops->handle_attr \|\|
	796	!ops->handshake_complete)
	797	return -EINVAL;
	798
e53e97ce DM	799	if (!ver_table \|\| ver_table_size < 0)
	800	return -EINVAL;
	801
	802	if (!name)
	803	return -EINVAL;
	804
	805	spin_lock_init(&vio->lock);
	806
	807	vio->name = name;
	808
	809	vio->dev_class = dev_class;
	810	vio->vdev = vdev;
	811
e53e97ce DM	812	vio->ver_table = ver_table;
	813	vio->ver_table_entries = ver_table_size;
	814
	815	vio->ops = ops;
	816
	817	setup_timer(&vio->timer, vio_port_timer, (unsigned long) vio);
	818
	819	return 0;
	820	}
	821	EXPORT_SYMBOL(vio_driver_init);