diff options
Diffstat (limited to 'arch/sparc/kernel/viohs.c')
-rw-r--r-- | arch/sparc/kernel/viohs.c | 824 |
1 files changed, 824 insertions, 0 deletions
diff --git a/arch/sparc/kernel/viohs.c b/arch/sparc/kernel/viohs.c new file mode 100644 index 0000000..aa6ac70 --- /dev/null +++ b/arch/sparc/kernel/viohs.c @@ -0,0 +1,824 @@ +/* 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) + return handshake_failure(vio); + nver = find_by_major(vio, pkt->major); + if (!nver) + 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); |