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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);
      vio->desc_buf = NULL;

      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);

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);

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