1 files changed, 279 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
new file mode 100644
index 000000000000..253cdcf306a2
--- /dev/null
+++ b/drivers/scsi/libsas/sas_port.c
@@ -0,0 +1,279 @@
+/*
+ * Serial Attached SCSI (SAS) Port class
+ *
+ * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ *
+ * This file is licensed under GPLv2.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "sas_internal.h"
+
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+#include "../scsi_sas_internal.h"
+
+/**
+ * sas_form_port -- add this phy to a port
+ * @phy: the phy of interest
+ *
+ * This function adds this phy to an existing port, thus creating a wide
+ * port, or it creates a port and adds the phy to the port.
+ */
+static void sas_form_port(struct asd_sas_phy *phy)
+{
+        int i;
+        struct sas_ha_struct *sas_ha = phy->ha;
+        struct asd_sas_port *port = phy->port;
+        struct sas_internal *si =
+                to_sas_internal(sas_ha->core.shost->transportt);
+
+        if (port) {
+                if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
+                           SAS_ADDR_SIZE) == 0)
+                        sas_deform_port(phy);
+                else {
+                        SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
+                                    __FUNCTION__, phy->id, phy->port->id,
+                                    phy->port->num_phys);
+                        return;
+                }
+        }
+
+        /* find a port */
+        spin_lock(&sas_ha->phy_port_lock);
+        for (i = 0; i < sas_ha->num_phys; i++) {
+                port = sas_ha->sas_port[i];
+                spin_lock(&port->phy_list_lock);
+                if (*(u64 *) port->sas_addr &&
+                    memcmp(port->attached_sas_addr,
+                           phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 &&
+                    port->num_phys > 0) {
+                        /* wide port */
+                        SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
+                                    port->id);
+                        break;
+                } else if (*(u64 *) port->sas_addr == 0 && port->num_phys==0) {
+                        memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE);
+                        break;
+                }
+                spin_unlock(&port->phy_list_lock);
+        }
+
+        if (i >= sas_ha->num_phys) {
+                printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
+                       __FUNCTION__);
+                spin_unlock(&sas_ha->phy_port_lock);
+                return;
+        }
+
+        /* add the phy to the port */
+        list_add_tail(&phy->port_phy_el, &port->phy_list);
+        phy->port = port;
+        port->num_phys++;
+        port->phy_mask |= (1U << phy->id);
+
+        if (!port->phy)
+                port->phy = phy->phy;
+
+        SAS_DPRINTK("phy%d added to port%d, phy_mask:0x%x\n", phy->id,
+                    port->id, port->phy_mask);
+
+        if (*(u64 *)port->attached_sas_addr == 0) {
+                port->class = phy->class;
+                memcpy(port->attached_sas_addr, phy->attached_sas_addr,
+                       SAS_ADDR_SIZE);
+                port->iproto = phy->iproto;
+                port->tproto = phy->tproto;
+                port->oob_mode = phy->oob_mode;
+                port->linkrate = phy->linkrate;
+        } else
+                port->linkrate = max(port->linkrate, phy->linkrate);
+        spin_unlock(&port->phy_list_lock);
+        spin_unlock(&sas_ha->phy_port_lock);
+
+        if (!port->port) {
+                port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
+                BUG_ON(!port->port);
+                sas_port_add(port->port);
+        }
+        sas_port_add_phy(port->port, phy->phy);
+
+        if (port->port_dev)
+                port->port_dev->pathways = port->num_phys;
+
+        /* Tell the LLDD about this port formation. */
+        if (si->dft->lldd_port_formed)
+                si->dft->lldd_port_formed(phy);
+
+        sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
+}
+
+/**
+ * sas_deform_port -- remove this phy from the port it belongs to
+ * @phy: the phy of interest
+ *
+ * This is called when the physical link to the other phy has been
+ * lost (on this phy), in Event thread context. We cannot delay here.
+ */
+void sas_deform_port(struct asd_sas_phy *phy)
+{
+        struct sas_ha_struct *sas_ha = phy->ha;
+        struct asd_sas_port *port = phy->port;
+        struct sas_internal *si =
+                to_sas_internal(sas_ha->core.shost->transportt);
+
+        if (!port)
+                return;           /* done by a phy event */
+
+        if (port->port_dev)
+                port->port_dev->pathways--;
+
+        if (port->num_phys == 1) {
+                sas_unregister_domain_devices(port);
+                sas_port_delete(port->port);
+                port->port = NULL;
+        } else
+                sas_port_delete_phy(port->port, phy->phy);
+
+
+        if (si->dft->lldd_port_deformed)
+                si->dft->lldd_port_deformed(phy);
+
+        spin_lock(&sas_ha->phy_port_lock);
+        spin_lock(&port->phy_list_lock);
+
+        list_del_init(&phy->port_phy_el);
+        phy->port = NULL;
+        port->num_phys--;
+        port->phy_mask &= ~(1U << phy->id);
+
+        if (port->num_phys == 0) {
+                INIT_LIST_HEAD(&port->phy_list);
+                memset(port->sas_addr, 0, SAS_ADDR_SIZE);
+                memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
+                port->class = 0;
+                port->iproto = 0;
+                port->tproto = 0;
+                port->oob_mode = 0;
+                port->phy_mask = 0;
+        }
+        spin_unlock(&port->phy_list_lock);
+        spin_unlock(&sas_ha->phy_port_lock);
+
+        return;
+}
+
+/* ---------- SAS port events ---------- */
+
+void sas_porte_bytes_dmaed(void *data)
+{
+        struct asd_sas_phy *phy = data;
+
+        sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
+                        &phy->port_events_pending);
+
+        sas_form_port(phy);
+}
+
+void sas_porte_broadcast_rcvd(void *data)
+{
+        unsigned long flags;
+        u32 prim;
+        struct asd_sas_phy *phy = data;
+
+        sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
+                        &phy->port_events_pending);
+
+        spin_lock_irqsave(&phy->sas_prim_lock, flags);
+        prim = phy->sas_prim;
+        spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
+
+        SAS_DPRINTK("broadcast received: %d\n", prim);
+        sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
+}
+
+void sas_porte_link_reset_err(void *data)
+{
+        struct asd_sas_phy *phy = data;
+
+        sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
+                        &phy->port_events_pending);
+
+        sas_deform_port(phy);
+}
+
+void sas_porte_timer_event(void *data)
+{
+        struct asd_sas_phy *phy = data;
+
+        sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
+                        &phy->port_events_pending);
+
+        sas_deform_port(phy);
+}
+
+void sas_porte_hard_reset(void *data)
+{
+        struct asd_sas_phy *phy = data;
+
+        sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
+                        &phy->port_events_pending);
+
+        sas_deform_port(phy);
+}
+
+/* ---------- SAS port registration ---------- */
+
+static void sas_init_port(struct asd_sas_port *port,
+                          struct sas_ha_struct *sas_ha, int i)
+{
+        port->id = i;
+        INIT_LIST_HEAD(&port->dev_list);
+        spin_lock_init(&port->phy_list_lock);
+        INIT_LIST_HEAD(&port->phy_list);
+        port->num_phys = 0;
+        port->phy_mask = 0;
+        port->ha = sas_ha;
+
+        spin_lock_init(&port->dev_list_lock);
+}
+
+int sas_register_ports(struct sas_ha_struct *sas_ha)
+{
+        int i;
+
+        /* initialize the ports and discovery */
+        for (i = 0; i < sas_ha->num_phys; i++) {
+                struct asd_sas_port *port = sas_ha->sas_port[i];
+
+                sas_init_port(port, sas_ha, i);
+                sas_init_disc(&port->disc, port);
+        }
+        return 0;
+}
+
+void sas_unregister_ports(struct sas_ha_struct *sas_ha)
+{
+        int i;
+
+        for (i = 0; i < sas_ha->num_phys; i++)
+                if (sas_ha->sas_phy[i]->port)
+                        sas_deform_port(sas_ha->sas_phy[i]);
+
+}