![Jason Yan](/assets/img/avatar_default.png)
Now ata devices attached with sas controller do not have transport class, so that we can not see any information of these ata devices in /sys/class/ata_port(or ata_link or ata_device). Add transport class for the ata devices attached with sas controller. The /sys/class directory will show the infomation of the ata devices as follows: localhost:/sys/class # ls ata* ata_device: dev1.0 dev2.0 ata_link: link1 link2 ata_port: ata1 ata2 No functional change of the device scanning and io path. The ata transport class was deleted when destroying the sas devices. Signed-off-by: Jason Yan <yanaijie@huawei.com> CC: Dan Williams <dan.j.williams@intel.com> CC: Tejun Heo <tj@kernel.org> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
599 lines
15 KiB
C
599 lines
15 KiB
C
/*
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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 <linux/async.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_ata.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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switch (dev->dev_type) {
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case SAS_END_DEVICE:
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INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
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break;
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case SAS_EDGE_EXPANDER_DEVICE:
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case SAS_FANOUT_EXPANDER_DEVICE:
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INIT_LIST_HEAD(&dev->ex_dev.children);
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mutex_init(&dev->ex_dev.cmd_mutex);
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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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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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int rc = -ENODEV;
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dev = sas_alloc_device();
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if (!dev)
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return -ENOMEM;
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spin_lock_irq(&port->phy_list_lock);
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if (list_empty(&port->phy_list)) {
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spin_unlock_irq(&port->phy_list_lock);
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sas_put_device(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_irq(&port->phy_list_lock);
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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 = SAS_SATA_PM;
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else
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dev->dev_type = SAS_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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dev->port = port;
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switch (dev->dev_type) {
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case SAS_SATA_DEV:
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rc = sas_ata_init(dev);
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if (rc) {
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rphy = NULL;
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break;
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}
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/* fall through */
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case SAS_END_DEVICE:
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rphy = sas_end_device_alloc(port->port);
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break;
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case SAS_EDGE_EXPANDER_DEVICE:
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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 SAS_FANOUT_EXPANDER_DEVICE:
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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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sas_put_device(dev);
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return rc;
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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->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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sas_device_set_phy(dev, port->port);
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dev->rphy = rphy;
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get_device(&dev->rphy->dev);
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if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE)
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list_add_tail(&dev->disco_list_node, &port->disco_list);
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else {
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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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}
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spin_lock_irq(&port->phy_list_lock);
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list_for_each_entry(phy, &port->phy_list, port_phy_el)
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sas_phy_set_target(phy, dev);
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spin_unlock_irq(&port->phy_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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return 0;
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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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set_bit(SAS_DEV_FOUND, &dev->state);
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kref_get(&dev->kref);
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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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return;
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if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
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i->dft->lldd_dev_gone(dev);
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sas_put_device(dev);
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}
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}
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static void sas_probe_devices(struct asd_sas_port *port)
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{
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struct domain_device *dev, *n;
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/* devices must be domain members before link recovery and probe */
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list_for_each_entry(dev, &port->disco_list, disco_list_node) {
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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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}
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sas_probe_sata(port);
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list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
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int err;
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err = sas_rphy_add(dev->rphy);
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if (err)
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sas_fail_probe(dev, __func__, err);
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else
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list_del_init(&dev->disco_list_node);
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}
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}
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static void sas_suspend_devices(struct work_struct *work)
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{
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struct asd_sas_phy *phy;
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struct domain_device *dev;
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struct sas_discovery_event *ev = to_sas_discovery_event(work);
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struct asd_sas_port *port = ev->port;
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struct Scsi_Host *shost = port->ha->core.shost;
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struct sas_internal *si = to_sas_internal(shost->transportt);
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clear_bit(DISCE_SUSPEND, &port->disc.pending);
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sas_suspend_sata(port);
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/* lldd is free to forget the domain_device across the
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* suspension, we force the issue here to keep the reference
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* counts aligned
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*/
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list_for_each_entry(dev, &port->dev_list, dev_list_node)
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sas_notify_lldd_dev_gone(dev);
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/* we are suspending, so we know events are disabled and
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* phy_list is not being mutated
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*/
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list_for_each_entry(phy, &port->phy_list, port_phy_el) {
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if (si->dft->lldd_port_formed)
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si->dft->lldd_port_deformed(phy);
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phy->suspended = 1;
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port->suspended = 1;
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}
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}
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static void sas_resume_devices(struct work_struct *work)
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{
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struct sas_discovery_event *ev = to_sas_discovery_event(work);
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struct asd_sas_port *port = ev->port;
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clear_bit(DISCE_RESUME, &port->disc.pending);
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sas_resume_sata(port);
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}
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/**
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* sas_discover_end_dev - discover an end device (SSP, etc)
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* @dev: 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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return res;
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return 0;
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}
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/* ---------- Device registration and unregistration ---------- */
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void sas_free_device(struct kref *kref)
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{
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struct domain_device *dev = container_of(kref, typeof(*dev), kref);
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put_device(&dev->rphy->dev);
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dev->rphy = NULL;
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if (dev->parent)
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sas_put_device(dev->parent);
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sas_port_put_phy(dev->phy);
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dev->phy = NULL;
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/* remove the phys and ports, everything else should be gone */
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if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
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kfree(dev->ex_dev.ex_phy);
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if (dev_is_sata(dev) && dev->sata_dev.ap) {
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ata_sas_tport_delete(dev->sata_dev.ap);
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ata_sas_port_destroy(dev->sata_dev.ap);
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dev->sata_dev.ap = NULL;
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}
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kfree(dev);
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}
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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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struct sas_ha_struct *ha = port->ha;
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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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if (dev_is_sata(dev))
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sas_ata_end_eh(dev->sata_dev.ap);
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spin_unlock_irq(&port->dev_list_lock);
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spin_lock_irq(&ha->lock);
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if (dev->dev_type == SAS_END_DEVICE &&
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!list_empty(&dev->ssp_dev.eh_list_node)) {
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list_del_init(&dev->ssp_dev.eh_list_node);
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ha->eh_active--;
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}
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spin_unlock_irq(&ha->lock);
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sas_put_device(dev);
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}
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void sas_destruct_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(dev, n, &port->destroy_list, disco_list_node) {
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list_del_init(&dev->disco_list_node);
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sas_remove_children(&dev->rphy->dev);
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sas_rphy_delete(dev->rphy);
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sas_unregister_common_dev(port, dev);
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}
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}
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static void sas_destruct_ports(struct asd_sas_port *port)
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{
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struct sas_port *sas_port, *p;
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list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
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list_del_init(&sas_port->del_list);
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sas_port_delete(sas_port);
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}
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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 (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
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!list_empty(&dev->disco_list_node)) {
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/* this rphy never saw sas_rphy_add */
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list_del_init(&dev->disco_list_node);
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sas_rphy_free(dev->rphy);
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sas_unregister_common_dev(port, dev);
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return;
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}
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if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
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sas_rphy_unlink(dev->rphy);
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list_move_tail(&dev->disco_list_node, &port->destroy_list);
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}
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}
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void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
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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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if (gone)
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set_bit(SAS_DEV_GONE, &dev->state);
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sas_unregister_dev(port, dev);
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}
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list_for_each_entry_safe(dev, n, &port->disco_list, disco_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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void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
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{
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struct sas_ha_struct *ha;
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struct sas_phy *new_phy;
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if (!dev)
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return;
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ha = dev->port->ha;
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new_phy = sas_port_get_phy(port);
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/* pin and record last seen phy */
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spin_lock_irq(&ha->phy_port_lock);
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if (new_phy) {
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sas_port_put_phy(dev->phy);
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dev->phy = new_phy;
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}
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spin_unlock_irq(&ha->phy_port_lock);
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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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* @work: work structure embedded in port domain device.
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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 = to_sas_discovery_event(work);
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struct asd_sas_port *port = ev->port;
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clear_bit(DISCE_DISCOVER_DOMAIN, &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_DEVICE:
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error = sas_discover_end_dev(dev);
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break;
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case SAS_EDGE_EXPANDER_DEVICE:
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case SAS_FANOUT_EXPANDER_DEVICE:
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error = sas_discover_root_expander(dev);
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break;
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case SAS_SATA_DEV:
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case SAS_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");
|
|
/* Fall through */
|
|
#endif
|
|
default:
|
|
error = -ENXIO;
|
|
SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
|
|
break;
|
|
}
|
|
|
|
if (error) {
|
|
sas_rphy_free(dev->rphy);
|
|
list_del_init(&dev->disco_list_node);
|
|
spin_lock_irq(&port->dev_list_lock);
|
|
list_del_init(&dev->dev_list_node);
|
|
spin_unlock_irq(&port->dev_list_lock);
|
|
|
|
sas_put_device(dev);
|
|
port->port_dev = NULL;
|
|
}
|
|
|
|
sas_probe_devices(port);
|
|
|
|
SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
|
|
task_pid_nr(current), error);
|
|
}
|
|
|
|
static void sas_revalidate_domain(struct work_struct *work)
|
|
{
|
|
int res = 0;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
struct sas_ha_struct *ha = port->ha;
|
|
struct domain_device *ddev = port->port_dev;
|
|
|
|
/* prevent revalidation from finding sata links in recovery */
|
|
mutex_lock(&ha->disco_mutex);
|
|
if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
|
|
SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
|
|
port->id, task_pid_nr(current));
|
|
goto out;
|
|
}
|
|
|
|
clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
|
|
|
|
SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
|
|
task_pid_nr(current));
|
|
|
|
if (ddev && (ddev->dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
|
|
ddev->dev_type == SAS_EDGE_EXPANDER_DEVICE))
|
|
res = sas_ex_revalidate_domain(ddev);
|
|
|
|
SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
|
|
port->id, task_pid_nr(current), res);
|
|
out:
|
|
mutex_unlock(&ha->disco_mutex);
|
|
|
|
sas_destruct_devices(port);
|
|
sas_destruct_ports(port);
|
|
sas_probe_devices(port);
|
|
}
|
|
|
|
/* ---------- Events ---------- */
|
|
|
|
static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
|
|
{
|
|
/* chained work is not subject to SA_HA_DRAINING or
|
|
* SAS_HA_REGISTERED, because it is either submitted in the
|
|
* workqueue, or known to be submitted from a context that is
|
|
* not racing against draining
|
|
*/
|
|
queue_work(ha->disco_q, &sw->work);
|
|
}
|
|
|
|
static void sas_chain_event(int event, unsigned long *pending,
|
|
struct sas_work *sw,
|
|
struct sas_ha_struct *ha)
|
|
{
|
|
if (!test_and_set_bit(event, pending)) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ha->lock, flags);
|
|
sas_chain_work(ha, sw);
|
|
spin_unlock_irqrestore(&ha->lock, flags);
|
|
}
|
|
}
|
|
|
|
int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
|
|
{
|
|
struct sas_discovery *disc;
|
|
|
|
if (!port)
|
|
return 0;
|
|
disc = &port->disc;
|
|
|
|
BUG_ON(ev >= DISC_NUM_EVENTS);
|
|
|
|
sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sas_init_disc - initialize the discovery struct in the port
|
|
* @disc: port discovery structure
|
|
* @port: pointer to struct port
|
|
*
|
|
* Called when the ports are being initialized.
|
|
*/
|
|
void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
|
|
{
|
|
int i;
|
|
|
|
static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
|
|
[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
|
|
[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
|
|
[DISCE_SUSPEND] = sas_suspend_devices,
|
|
[DISCE_RESUME] = sas_resume_devices,
|
|
};
|
|
|
|
disc->pending = 0;
|
|
for (i = 0; i < DISC_NUM_EVENTS; i++) {
|
|
INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
|
|
disc->disc_work[i].port = port;
|
|
}
|
|
}
|