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391 lines
10 KiB
391 lines
10 KiB
/*
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* Serial Attached SCSI (SAS) Discover process
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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 <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_eh.h>
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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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/* ---------- Basic task processing for discovery purposes ---------- */
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void sas_init_dev(struct domain_device *dev)
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{
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INIT_LIST_HEAD(&dev->siblings);
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INIT_LIST_HEAD(&dev->dev_list_node);
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switch (dev->dev_type) {
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case SAS_END_DEV:
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break;
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case EDGE_DEV:
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case FANOUT_DEV:
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INIT_LIST_HEAD(&dev->ex_dev.children);
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break;
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case SATA_DEV:
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case SATA_PM:
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case SATA_PM_PORT:
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INIT_LIST_HEAD(&dev->sata_dev.children);
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break;
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default:
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break;
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}
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}
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/* ---------- Domain device discovery ---------- */
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/**
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* sas_get_port_device -- Discover devices which caused port creation
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* @port: pointer to struct sas_port of interest
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*
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* Devices directly attached to a HA port, have no parent. This is
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* how we know they are (domain) "root" devices. All other devices
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* do, and should have their "parent" pointer set appropriately as
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* soon as a child device is discovered.
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*/
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static int sas_get_port_device(struct asd_sas_port *port)
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{
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unsigned long flags;
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struct asd_sas_phy *phy;
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struct sas_rphy *rphy;
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struct domain_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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spin_lock_irqsave(&port->phy_list_lock, flags);
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if (list_empty(&port->phy_list)) {
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spin_unlock_irqrestore(&port->phy_list_lock, flags);
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kfree(dev);
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return -ENODEV;
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}
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phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
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spin_lock(&phy->frame_rcvd_lock);
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memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
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(size_t)phy->frame_rcvd_size));
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spin_unlock(&phy->frame_rcvd_lock);
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spin_unlock_irqrestore(&port->phy_list_lock, flags);
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if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
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struct dev_to_host_fis *fis =
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(struct dev_to_host_fis *) dev->frame_rcvd;
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if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
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fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
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&& (fis->device & ~0x10) == 0)
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dev->dev_type = SATA_PM;
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else
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dev->dev_type = SATA_DEV;
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dev->tproto = SAS_PROTOCOL_SATA;
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} else {
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struct sas_identify_frame *id =
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(struct sas_identify_frame *) dev->frame_rcvd;
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dev->dev_type = id->dev_type;
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dev->iproto = id->initiator_bits;
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dev->tproto = id->target_bits;
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}
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sas_init_dev(dev);
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switch (dev->dev_type) {
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case SAS_END_DEV:
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case SATA_DEV:
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rphy = sas_end_device_alloc(port->port);
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break;
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case EDGE_DEV:
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rphy = sas_expander_alloc(port->port,
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SAS_EDGE_EXPANDER_DEVICE);
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break;
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case FANOUT_DEV:
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rphy = sas_expander_alloc(port->port,
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SAS_FANOUT_EXPANDER_DEVICE);
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break;
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default:
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printk("ERROR: Unidentified device type %d\n", dev->dev_type);
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rphy = NULL;
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break;
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}
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if (!rphy) {
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kfree(dev);
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return -ENODEV;
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}
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rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
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memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
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sas_fill_in_rphy(dev, rphy);
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sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
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port->port_dev = dev;
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dev->port = port;
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dev->linkrate = port->linkrate;
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dev->min_linkrate = port->linkrate;
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dev->max_linkrate = port->linkrate;
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dev->pathways = port->num_phys;
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memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
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memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
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memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
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port->disc.max_level = 0;
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dev->rphy = rphy;
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spin_lock_irq(&port->dev_list_lock);
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list_add_tail(&dev->dev_list_node, &port->dev_list);
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spin_unlock_irq(&port->dev_list_lock);
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return 0;
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}
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/* ---------- Discover and Revalidate ---------- */
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int sas_notify_lldd_dev_found(struct domain_device *dev)
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{
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int res = 0;
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struct sas_ha_struct *sas_ha = dev->port->ha;
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struct Scsi_Host *shost = sas_ha->core.shost;
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struct sas_internal *i = to_sas_internal(shost->transportt);
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if (i->dft->lldd_dev_found) {
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res = i->dft->lldd_dev_found(dev);
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if (res) {
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printk("sas: driver on pcidev %s cannot handle "
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"device %llx, error:%d\n",
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dev_name(sas_ha->dev),
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SAS_ADDR(dev->sas_addr), res);
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}
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}
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return res;
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}
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void sas_notify_lldd_dev_gone(struct domain_device *dev)
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{
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struct sas_ha_struct *sas_ha = dev->port->ha;
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struct Scsi_Host *shost = sas_ha->core.shost;
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struct sas_internal *i = to_sas_internal(shost->transportt);
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if (i->dft->lldd_dev_gone)
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i->dft->lldd_dev_gone(dev);
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}
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/* ---------- Common/dispatchers ---------- */
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/**
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* sas_discover_end_dev -- discover an end device (SSP, etc)
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* @end: pointer to domain device of interest
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*
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* See comment in sas_discover_sata().
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*/
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int sas_discover_end_dev(struct domain_device *dev)
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{
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int res;
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res = sas_notify_lldd_dev_found(dev);
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if (res)
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goto out_err2;
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res = sas_rphy_add(dev->rphy);
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if (res)
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goto out_err;
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return 0;
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out_err:
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sas_notify_lldd_dev_gone(dev);
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out_err2:
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return res;
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}
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/* ---------- Device registration and unregistration ---------- */
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static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
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{
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sas_notify_lldd_dev_gone(dev);
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if (!dev->parent)
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dev->port->port_dev = NULL;
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else
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list_del_init(&dev->siblings);
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spin_lock_irq(&port->dev_list_lock);
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list_del_init(&dev->dev_list_node);
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spin_unlock_irq(&port->dev_list_lock);
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}
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void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
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{
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if (dev->rphy) {
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sas_remove_children(&dev->rphy->dev);
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sas_rphy_delete(dev->rphy);
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dev->rphy = NULL;
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}
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if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
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/* remove the phys and ports, everything else should be gone */
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kfree(dev->ex_dev.ex_phy);
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dev->ex_dev.ex_phy = NULL;
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}
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sas_unregister_common_dev(port, dev);
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}
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void sas_unregister_domain_devices(struct asd_sas_port *port)
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{
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struct domain_device *dev, *n;
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list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node)
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sas_unregister_dev(port, dev);
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port->port->rphy = NULL;
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}
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/* ---------- Discovery and Revalidation ---------- */
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/**
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* sas_discover_domain -- discover the domain
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* @port: port to the domain of interest
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*
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* NOTE: this process _must_ quit (return) as soon as any connection
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* errors are encountered. Connection recovery is done elsewhere.
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* Discover process only interrogates devices in order to discover the
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* domain.
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*/
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static void sas_discover_domain(struct work_struct *work)
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{
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struct domain_device *dev;
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int error = 0;
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struct sas_discovery_event *ev =
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container_of(work, struct sas_discovery_event, work);
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struct asd_sas_port *port = ev->port;
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sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
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&port->disc.pending);
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if (port->port_dev)
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return;
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error = sas_get_port_device(port);
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if (error)
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return;
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dev = port->port_dev;
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SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
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task_pid_nr(current));
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switch (dev->dev_type) {
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case SAS_END_DEV:
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error = sas_discover_end_dev(dev);
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break;
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case EDGE_DEV:
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case FANOUT_DEV:
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error = sas_discover_root_expander(dev);
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break;
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case SATA_DEV:
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case SATA_PM:
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#ifdef CONFIG_SCSI_SAS_ATA
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error = sas_discover_sata(dev);
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break;
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#else
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SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
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/* Fall through */
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#endif
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default:
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error = -ENXIO;
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SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
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break;
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}
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if (error) {
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sas_rphy_free(dev->rphy);
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dev->rphy = NULL;
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spin_lock_irq(&port->dev_list_lock);
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list_del_init(&dev->dev_list_node);
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spin_unlock_irq(&port->dev_list_lock);
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kfree(dev); /* not kobject_register-ed yet */
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port->port_dev = NULL;
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}
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SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
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task_pid_nr(current), error);
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}
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static void sas_revalidate_domain(struct work_struct *work)
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{
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int res = 0;
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struct sas_discovery_event *ev =
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container_of(work, struct sas_discovery_event, work);
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struct asd_sas_port *port = ev->port;
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sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
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&port->disc.pending);
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SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
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task_pid_nr(current));
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if (port->port_dev)
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res = sas_ex_revalidate_domain(port->port_dev);
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SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
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port->id, task_pid_nr(current), res);
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}
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/* ---------- Events ---------- */
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int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
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{
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struct sas_discovery *disc;
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if (!port)
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return 0;
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disc = &port->disc;
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BUG_ON(ev >= DISC_NUM_EVENTS);
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sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
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&disc->disc_work[ev].work, port->ha);
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return 0;
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}
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/**
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* sas_init_disc -- initialize the discovery struct in the port
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* @port: pointer to struct port
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*
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* Called when the ports are being initialized.
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*/
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void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
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{
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int i;
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static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
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[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
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[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
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};
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spin_lock_init(&disc->disc_event_lock);
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disc->pending = 0;
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for (i = 0; i < DISC_NUM_EVENTS; i++) {
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INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
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disc->disc_work[i].port = port;
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}
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}
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