mirror of https://gitee.com/openkylin/linux.git
379 lines
10 KiB
C
379 lines
10 KiB
C
/*
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* Serial Attached SCSI (SAS) Port class
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*
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
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* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
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*
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* This file is licensed under GPLv2.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "sas_internal.h"
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_sas.h>
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#include "../scsi_sas_internal.h"
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static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
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{
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struct sas_ha_struct *sas_ha = phy->ha;
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if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
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SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
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memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
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return false;
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return true;
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}
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static void sas_resume_port(struct asd_sas_phy *phy)
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{
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struct domain_device *dev;
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struct asd_sas_port *port = phy->port;
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struct sas_ha_struct *sas_ha = phy->ha;
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struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt);
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if (si->dft->lldd_port_formed)
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si->dft->lldd_port_formed(phy);
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if (port->suspended)
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port->suspended = 0;
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else {
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/* we only need to handle "link returned" actions once */
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return;
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}
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/* if the port came back:
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* 1/ presume every device came back
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* 2/ force the next revalidation to check all expander phys
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*/
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list_for_each_entry(dev, &port->dev_list, dev_list_node) {
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int i, rc;
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rc = sas_notify_lldd_dev_found(dev);
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if (rc) {
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sas_unregister_dev(port, dev);
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sas_destruct_devices(port);
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continue;
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}
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if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
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dev->ex_dev.ex_change_count = -1;
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for (i = 0; i < dev->ex_dev.num_phys; i++) {
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struct ex_phy *phy = &dev->ex_dev.ex_phy[i];
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phy->phy_change_count = -1;
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}
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}
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}
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sas_discover_event(port, DISCE_RESUME);
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}
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/**
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* sas_form_port - add this phy to a port
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* @phy: the phy of interest
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*
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* This function adds this phy to an existing port, thus creating a wide
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* port, or it creates a port and adds the phy to the port.
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*/
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static void sas_form_port(struct asd_sas_phy *phy)
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{
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int i;
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struct sas_ha_struct *sas_ha = phy->ha;
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struct asd_sas_port *port = phy->port;
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struct domain_device *port_dev;
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struct sas_internal *si =
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to_sas_internal(sas_ha->core.shost->transportt);
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unsigned long flags;
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if (port) {
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if (!phy_is_wideport_member(port, phy))
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sas_deform_port(phy, 0);
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else if (phy->suspended) {
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phy->suspended = 0;
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sas_resume_port(phy);
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/* phy came back, try to cancel the timeout */
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wake_up(&sas_ha->eh_wait_q);
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return;
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} else {
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pr_info("%s: phy%d belongs to port%d already(%d)!\n",
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__func__, phy->id, phy->port->id,
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phy->port->num_phys);
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return;
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}
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}
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/* see if the phy should be part of a wide port */
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spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
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for (i = 0; i < sas_ha->num_phys; i++) {
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port = sas_ha->sas_port[i];
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spin_lock(&port->phy_list_lock);
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if (*(u64 *) port->sas_addr &&
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phy_is_wideport_member(port, phy) && port->num_phys > 0) {
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/* wide port */
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pr_debug("phy%d matched wide port%d\n", phy->id,
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port->id);
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break;
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}
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spin_unlock(&port->phy_list_lock);
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}
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/* The phy does not match any existing port, create a new one */
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if (i == sas_ha->num_phys) {
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for (i = 0; i < sas_ha->num_phys; i++) {
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port = sas_ha->sas_port[i];
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spin_lock(&port->phy_list_lock);
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if (*(u64 *)port->sas_addr == 0
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&& port->num_phys == 0) {
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memcpy(port->sas_addr, phy->sas_addr,
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SAS_ADDR_SIZE);
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break;
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}
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spin_unlock(&port->phy_list_lock);
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}
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}
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if (i >= sas_ha->num_phys) {
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pr_err("%s: couldn't find a free port, bug?\n", __func__);
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spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
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return;
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}
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/* add the phy to the port */
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port_dev = port->port_dev;
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list_add_tail(&phy->port_phy_el, &port->phy_list);
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sas_phy_set_target(phy, port_dev);
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phy->port = port;
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port->num_phys++;
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port->phy_mask |= (1U << phy->id);
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if (*(u64 *)port->attached_sas_addr == 0) {
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port->class = phy->class;
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memcpy(port->attached_sas_addr, phy->attached_sas_addr,
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SAS_ADDR_SIZE);
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port->iproto = phy->iproto;
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port->tproto = phy->tproto;
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port->oob_mode = phy->oob_mode;
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port->linkrate = phy->linkrate;
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} else
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port->linkrate = max(port->linkrate, phy->linkrate);
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spin_unlock(&port->phy_list_lock);
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spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
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if (!port->port) {
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port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
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BUG_ON(!port->port);
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sas_port_add(port->port);
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}
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sas_port_add_phy(port->port, phy->phy);
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pr_debug("%s added to %s, phy_mask:0x%x (%16llx)\n",
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dev_name(&phy->phy->dev), dev_name(&port->port->dev),
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port->phy_mask,
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SAS_ADDR(port->attached_sas_addr));
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if (port_dev)
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port_dev->pathways = port->num_phys;
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/* Tell the LLDD about this port formation. */
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if (si->dft->lldd_port_formed)
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si->dft->lldd_port_formed(phy);
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sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
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/* Only insert a revalidate event after initial discovery */
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if (port_dev && sas_dev_type_is_expander(port_dev->dev_type)) {
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struct expander_device *ex_dev = &port_dev->ex_dev;
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ex_dev->ex_change_count = -1;
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sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
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}
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flush_workqueue(sas_ha->disco_q);
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}
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/**
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* sas_deform_port - remove this phy from the port it belongs to
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* @phy: the phy of interest
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* @gone: whether or not the PHY is gone
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*
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* This is called when the physical link to the other phy has been
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* lost (on this phy), in Event thread context. We cannot delay here.
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*/
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void sas_deform_port(struct asd_sas_phy *phy, int gone)
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{
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struct sas_ha_struct *sas_ha = phy->ha;
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struct asd_sas_port *port = phy->port;
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struct sas_internal *si =
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to_sas_internal(sas_ha->core.shost->transportt);
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struct domain_device *dev;
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unsigned long flags;
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if (!port)
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return; /* done by a phy event */
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dev = port->port_dev;
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if (dev)
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dev->pathways--;
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if (port->num_phys == 1) {
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sas_unregister_domain_devices(port, gone);
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sas_destruct_devices(port);
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sas_port_delete(port->port);
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port->port = NULL;
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} else {
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sas_port_delete_phy(port->port, phy->phy);
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sas_device_set_phy(dev, port->port);
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}
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if (si->dft->lldd_port_deformed)
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si->dft->lldd_port_deformed(phy);
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spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
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spin_lock(&port->phy_list_lock);
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list_del_init(&phy->port_phy_el);
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sas_phy_set_target(phy, NULL);
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phy->port = NULL;
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port->num_phys--;
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port->phy_mask &= ~(1U << phy->id);
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if (port->num_phys == 0) {
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INIT_LIST_HEAD(&port->phy_list);
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memset(port->sas_addr, 0, SAS_ADDR_SIZE);
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memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
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port->class = 0;
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port->iproto = 0;
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port->tproto = 0;
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port->oob_mode = 0;
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port->phy_mask = 0;
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}
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spin_unlock(&port->phy_list_lock);
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spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
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/* Only insert revalidate event if the port still has members */
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if (port->port && dev && sas_dev_type_is_expander(dev->dev_type)) {
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struct expander_device *ex_dev = &dev->ex_dev;
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ex_dev->ex_change_count = -1;
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sas_discover_event(port, DISCE_REVALIDATE_DOMAIN);
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}
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flush_workqueue(sas_ha->disco_q);
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return;
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}
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/* ---------- SAS port events ---------- */
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void sas_porte_bytes_dmaed(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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struct asd_sas_phy *phy = ev->phy;
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sas_form_port(phy);
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}
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void sas_porte_broadcast_rcvd(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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struct asd_sas_phy *phy = ev->phy;
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unsigned long flags;
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u32 prim;
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spin_lock_irqsave(&phy->sas_prim_lock, flags);
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prim = phy->sas_prim;
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spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
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pr_debug("broadcast received: %d\n", prim);
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sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
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if (phy->port)
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flush_workqueue(phy->port->ha->disco_q);
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}
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void sas_porte_link_reset_err(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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struct asd_sas_phy *phy = ev->phy;
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sas_deform_port(phy, 1);
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}
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void sas_porte_timer_event(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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struct asd_sas_phy *phy = ev->phy;
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sas_deform_port(phy, 1);
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}
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void sas_porte_hard_reset(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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struct asd_sas_phy *phy = ev->phy;
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sas_deform_port(phy, 1);
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}
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/* ---------- SAS port registration ---------- */
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static void sas_init_port(struct asd_sas_port *port,
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struct sas_ha_struct *sas_ha, int i)
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{
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memset(port, 0, sizeof(*port));
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port->id = i;
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INIT_LIST_HEAD(&port->dev_list);
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INIT_LIST_HEAD(&port->disco_list);
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INIT_LIST_HEAD(&port->destroy_list);
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INIT_LIST_HEAD(&port->sas_port_del_list);
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spin_lock_init(&port->phy_list_lock);
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INIT_LIST_HEAD(&port->phy_list);
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port->ha = sas_ha;
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spin_lock_init(&port->dev_list_lock);
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}
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int sas_register_ports(struct sas_ha_struct *sas_ha)
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{
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int i;
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/* initialize the ports and discovery */
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for (i = 0; i < sas_ha->num_phys; i++) {
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struct asd_sas_port *port = sas_ha->sas_port[i];
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sas_init_port(port, sas_ha, i);
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sas_init_disc(&port->disc, port);
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}
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return 0;
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}
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void sas_unregister_ports(struct sas_ha_struct *sas_ha)
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{
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int i;
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for (i = 0; i < sas_ha->num_phys; i++)
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if (sas_ha->sas_phy[i]->port)
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sas_deform_port(sas_ha->sas_phy[i], 0);
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}
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const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
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[PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
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[PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
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[PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
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[PORTE_TIMER_EVENT] = sas_porte_timer_event,
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[PORTE_HARD_RESET] = sas_porte_hard_reset,
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};
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