857 lines
18 KiB
C
857 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* viohs.c: LDOM Virtual I/O handshake helper layer.
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*
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* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/sched/clock.h>
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#include <linux/slab.h>
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#include <asm/ldc.h>
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#include <asm/vio.h>
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int vio_ldc_send(struct vio_driver_state *vio, void *data, int len)
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{
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int err, limit = 1000;
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err = -EINVAL;
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while (limit-- > 0) {
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err = ldc_write(vio->lp, data, len);
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if (!err || (err != -EAGAIN))
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break;
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udelay(1);
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}
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return err;
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}
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EXPORT_SYMBOL(vio_ldc_send);
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static int send_ctrl(struct vio_driver_state *vio,
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struct vio_msg_tag *tag, int len)
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{
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tag->sid = vio_send_sid(vio);
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return vio_ldc_send(vio, tag, len);
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}
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static void init_tag(struct vio_msg_tag *tag, u8 type, u8 stype, u16 stype_env)
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{
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tag->type = type;
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tag->stype = stype;
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tag->stype_env = stype_env;
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}
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static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
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{
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struct vio_ver_info pkt;
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vio->_local_sid = (u32) sched_clock();
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memset(&pkt, 0, sizeof(pkt));
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init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
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pkt.major = major;
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pkt.minor = minor;
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pkt.dev_class = vio->dev_class;
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viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
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major, minor, vio->dev_class);
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return send_ctrl(vio, &pkt.tag, sizeof(pkt));
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}
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static int start_handshake(struct vio_driver_state *vio)
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{
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int err;
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viodbg(HS, "START HANDSHAKE\n");
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vio->hs_state = VIO_HS_INVALID;
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err = send_version(vio,
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vio->ver_table[0].major,
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vio->ver_table[0].minor);
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if (err < 0)
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return err;
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return 0;
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}
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static void flush_rx_dring(struct vio_driver_state *vio)
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{
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struct vio_dring_state *dr;
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u64 ident;
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BUG_ON(!(vio->dr_state & VIO_DR_STATE_RXREG));
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dr = &vio->drings[VIO_DRIVER_RX_RING];
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ident = dr->ident;
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BUG_ON(!vio->desc_buf);
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kfree(vio->desc_buf);
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vio->desc_buf = NULL;
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memset(dr, 0, sizeof(*dr));
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dr->ident = ident;
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}
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void vio_link_state_change(struct vio_driver_state *vio, int event)
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{
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if (event == LDC_EVENT_UP) {
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vio->hs_state = VIO_HS_INVALID;
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switch (vio->dev_class) {
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case VDEV_NETWORK:
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case VDEV_NETWORK_SWITCH:
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vio->dr_state = (VIO_DR_STATE_TXREQ |
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VIO_DR_STATE_RXREQ);
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break;
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case VDEV_DISK:
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vio->dr_state = VIO_DR_STATE_TXREQ;
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break;
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case VDEV_DISK_SERVER:
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vio->dr_state = VIO_DR_STATE_RXREQ;
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break;
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}
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start_handshake(vio);
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} else if (event == LDC_EVENT_RESET) {
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vio->hs_state = VIO_HS_INVALID;
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if (vio->dr_state & VIO_DR_STATE_RXREG)
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flush_rx_dring(vio);
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vio->dr_state = 0x00;
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memset(&vio->ver, 0, sizeof(vio->ver));
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ldc_disconnect(vio->lp);
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}
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}
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EXPORT_SYMBOL(vio_link_state_change);
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static int handshake_failure(struct vio_driver_state *vio)
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{
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struct vio_dring_state *dr;
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/* XXX Put policy here... Perhaps start a timer to fire
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* XXX in 100 ms, which will bring the link up and retry
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* XXX the handshake.
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*/
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viodbg(HS, "HANDSHAKE FAILURE\n");
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vio->dr_state &= ~(VIO_DR_STATE_TXREG |
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VIO_DR_STATE_RXREG);
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dr = &vio->drings[VIO_DRIVER_RX_RING];
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memset(dr, 0, sizeof(*dr));
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kfree(vio->desc_buf);
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vio->desc_buf = NULL;
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vio->desc_buf_len = 0;
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vio->hs_state = VIO_HS_INVALID;
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return -ECONNRESET;
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}
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static int process_unknown(struct vio_driver_state *vio, void *arg)
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{
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struct vio_msg_tag *pkt = arg;
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viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
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pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
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printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
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vio->vdev->channel_id);
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ldc_disconnect(vio->lp);
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return -ECONNRESET;
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}
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static int send_dreg(struct vio_driver_state *vio)
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{
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struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
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union {
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struct vio_dring_register pkt;
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char all[sizeof(struct vio_dring_register) +
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(sizeof(struct ldc_trans_cookie) *
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dr->ncookies)];
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} u;
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int i;
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memset(&u, 0, sizeof(u));
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init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
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u.pkt.dring_ident = 0;
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u.pkt.num_descr = dr->num_entries;
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u.pkt.descr_size = dr->entry_size;
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u.pkt.options = VIO_TX_DRING;
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u.pkt.num_cookies = dr->ncookies;
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viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
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"ncookies[%u]\n",
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u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
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u.pkt.num_cookies);
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for (i = 0; i < dr->ncookies; i++) {
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u.pkt.cookies[i] = dr->cookies[i];
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viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
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i,
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(unsigned long long) u.pkt.cookies[i].cookie_addr,
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(unsigned long long) u.pkt.cookies[i].cookie_size);
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}
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return send_ctrl(vio, &u.pkt.tag, sizeof(u));
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}
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static int send_rdx(struct vio_driver_state *vio)
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{
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struct vio_rdx pkt;
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memset(&pkt, 0, sizeof(pkt));
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init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);
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viodbg(HS, "SEND RDX INFO\n");
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return send_ctrl(vio, &pkt.tag, sizeof(pkt));
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}
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static int send_attr(struct vio_driver_state *vio)
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{
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if (!vio->ops)
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return -EINVAL;
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return vio->ops->send_attr(vio);
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}
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static struct vio_version *find_by_major(struct vio_driver_state *vio,
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u16 major)
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{
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struct vio_version *ret = NULL;
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int i;
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for (i = 0; i < vio->ver_table_entries; i++) {
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struct vio_version *v = &vio->ver_table[i];
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if (v->major <= major) {
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ret = v;
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break;
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}
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}
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return ret;
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}
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static int process_ver_info(struct vio_driver_state *vio,
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struct vio_ver_info *pkt)
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{
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struct vio_version *vap;
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int err;
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viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
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pkt->major, pkt->minor, pkt->dev_class);
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if (vio->hs_state != VIO_HS_INVALID) {
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/* XXX Perhaps invoke start_handshake? XXX */
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memset(&vio->ver, 0, sizeof(vio->ver));
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vio->hs_state = VIO_HS_INVALID;
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}
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vap = find_by_major(vio, pkt->major);
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vio->_peer_sid = pkt->tag.sid;
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if (!vap) {
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pkt->tag.stype = VIO_SUBTYPE_NACK;
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pkt->major = 0;
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pkt->minor = 0;
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viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
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err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
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} else if (vap->major != pkt->major) {
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pkt->tag.stype = VIO_SUBTYPE_NACK;
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pkt->major = vap->major;
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pkt->minor = vap->minor;
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viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
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pkt->major, pkt->minor);
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err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
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} else {
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struct vio_version ver = {
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.major = pkt->major,
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.minor = pkt->minor,
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};
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if (ver.minor > vap->minor)
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ver.minor = vap->minor;
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pkt->minor = ver.minor;
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pkt->tag.stype = VIO_SUBTYPE_ACK;
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pkt->dev_class = vio->dev_class;
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viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
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pkt->major, pkt->minor);
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err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
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if (err > 0) {
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vio->ver = ver;
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vio->hs_state = VIO_HS_GOTVERS;
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}
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}
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if (err < 0)
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return handshake_failure(vio);
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return 0;
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}
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static int process_ver_ack(struct vio_driver_state *vio,
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struct vio_ver_info *pkt)
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{
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viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
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pkt->major, pkt->minor, pkt->dev_class);
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if (vio->hs_state & VIO_HS_GOTVERS) {
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if (vio->ver.major != pkt->major ||
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vio->ver.minor != pkt->minor) {
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pkt->tag.stype = VIO_SUBTYPE_NACK;
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(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
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return handshake_failure(vio);
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}
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} else {
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vio->ver.major = pkt->major;
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vio->ver.minor = pkt->minor;
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vio->hs_state = VIO_HS_GOTVERS;
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}
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switch (vio->dev_class) {
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case VDEV_NETWORK:
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case VDEV_DISK:
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if (send_attr(vio) < 0)
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return handshake_failure(vio);
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break;
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default:
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break;
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}
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return 0;
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}
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static int process_ver_nack(struct vio_driver_state *vio,
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struct vio_ver_info *pkt)
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{
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struct vio_version *nver;
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viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
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pkt->major, pkt->minor, pkt->dev_class);
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if (pkt->major == 0 && pkt->minor == 0)
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return handshake_failure(vio);
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nver = find_by_major(vio, pkt->major);
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if (!nver)
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return handshake_failure(vio);
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if (send_version(vio, nver->major, nver->minor) < 0)
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return handshake_failure(vio);
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return 0;
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}
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static int process_ver(struct vio_driver_state *vio, struct vio_ver_info *pkt)
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{
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switch (pkt->tag.stype) {
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case VIO_SUBTYPE_INFO:
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return process_ver_info(vio, pkt);
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case VIO_SUBTYPE_ACK:
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return process_ver_ack(vio, pkt);
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case VIO_SUBTYPE_NACK:
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return process_ver_nack(vio, pkt);
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default:
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return handshake_failure(vio);
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}
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}
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static int process_attr(struct vio_driver_state *vio, void *pkt)
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{
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int err;
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if (!(vio->hs_state & VIO_HS_GOTVERS))
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return handshake_failure(vio);
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if (!vio->ops)
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return 0;
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err = vio->ops->handle_attr(vio, pkt);
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if (err < 0) {
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return handshake_failure(vio);
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} else {
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vio->hs_state |= VIO_HS_GOT_ATTR;
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if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
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!(vio->hs_state & VIO_HS_SENT_DREG)) {
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if (send_dreg(vio) < 0)
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return handshake_failure(vio);
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vio->hs_state |= VIO_HS_SENT_DREG;
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}
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}
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return 0;
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}
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static int all_drings_registered(struct vio_driver_state *vio)
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{
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int need_rx, need_tx;
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need_rx = (vio->dr_state & VIO_DR_STATE_RXREQ);
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need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);
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if (need_rx &&
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!(vio->dr_state & VIO_DR_STATE_RXREG))
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return 0;
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if (need_tx &&
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!(vio->dr_state & VIO_DR_STATE_TXREG))
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return 0;
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return 1;
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}
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static int process_dreg_info(struct vio_driver_state *vio,
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struct vio_dring_register *pkt)
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{
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struct vio_dring_state *dr;
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int i, len;
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viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
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"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
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(unsigned long long) pkt->dring_ident,
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pkt->num_descr, pkt->descr_size, pkt->options,
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pkt->num_cookies);
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if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
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goto send_nack;
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if (vio->dr_state & VIO_DR_STATE_RXREG)
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goto send_nack;
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/* v1.6 and higher, ACK with desired, supported mode, or NACK */
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if (vio_version_after_eq(vio, 1, 6)) {
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if (!(pkt->options & VIO_TX_DRING))
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goto send_nack;
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pkt->options = VIO_TX_DRING;
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}
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BUG_ON(vio->desc_buf);
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vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
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if (!vio->desc_buf)
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goto send_nack;
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vio->desc_buf_len = pkt->descr_size;
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dr = &vio->drings[VIO_DRIVER_RX_RING];
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dr->num_entries = pkt->num_descr;
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dr->entry_size = pkt->descr_size;
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dr->ncookies = pkt->num_cookies;
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for (i = 0; i < dr->ncookies; i++) {
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dr->cookies[i] = pkt->cookies[i];
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viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
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i,
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(unsigned long long)
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pkt->cookies[i].cookie_addr,
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(unsigned long long)
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pkt->cookies[i].cookie_size);
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}
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pkt->tag.stype = VIO_SUBTYPE_ACK;
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pkt->dring_ident = ++dr->ident;
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viodbg(HS, "SEND DRING_REG ACK ident[%llx] "
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"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
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(unsigned long long) pkt->dring_ident,
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pkt->num_descr, pkt->descr_size, pkt->options,
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pkt->num_cookies);
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len = (sizeof(*pkt) +
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(dr->ncookies * sizeof(struct ldc_trans_cookie)));
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if (send_ctrl(vio, &pkt->tag, len) < 0)
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goto send_nack;
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vio->dr_state |= VIO_DR_STATE_RXREG;
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return 0;
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send_nack:
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pkt->tag.stype = VIO_SUBTYPE_NACK;
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viodbg(HS, "SEND DRING_REG NACK\n");
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(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
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return handshake_failure(vio);
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}
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static int process_dreg_ack(struct vio_driver_state *vio,
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struct vio_dring_register *pkt)
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{
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struct vio_dring_state *dr;
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viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
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|
"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)) {
|
|
if (vio->ops)
|
|
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, vio->name);
|
|
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);
|
|
if (err)
|
|
printk(KERN_WARNING "%s: Port %lu bind failed, "
|
|
"err=%d\n",
|
|
vio->name, vio->vdev->channel_id, err);
|
|
}
|
|
|
|
if (!err) {
|
|
if (ldc_mode(vio->lp) == LDC_MODE_RAW)
|
|
ldc_set_state(vio->lp, LDC_STATE_CONNECTED);
|
|
else
|
|
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(struct timer_list *t)
|
|
{
|
|
struct vio_driver_state *vio = from_timer(vio, t, timer);
|
|
|
|
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:
|
|
case VDEV_CONSOLE_CON:
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev_class == VDEV_NETWORK ||
|
|
dev_class == VDEV_NETWORK_SWITCH ||
|
|
dev_class == VDEV_DISK ||
|
|
dev_class == VDEV_DISK_SERVER) {
|
|
if (!ops || !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;
|
|
|
|
timer_setup(&vio->timer, vio_port_timer, 0);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(vio_driver_init);
|