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-rw-r--r--arch/sparc/kernel/viohs.c822
1 files changed, 822 insertions, 0 deletions
diff --git a/arch/sparc/kernel/viohs.c b/arch/sparc/kernel/viohs.c
new file mode 100644
index 000000000000..708fa1705fbe
--- /dev/null
+++ b/arch/sparc/kernel/viohs.c
@@ -0,0 +1,822 @@
+/* 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);