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linux/drivers/scsi/isci/port.h
Dan Williams 52d7463433 [SCSI] isci: revert bcn filtering 
The initial bcn filtering implementation was validated on a kernel
baseline that predated the switch to new libata error handling.  Also,
prior to that conversion we borrowed the mvsas MVS_DEV_EH approach to
prevent the unwanted extra ap->ops->phy_reset(ap) that occurred in the
ata_bus_probe() path.

After the conversion to new libata eh resets at discovery are more
frequent and get filtered prematurely by IDEV_EH.  The result is that
our bcn filtering has been blocked from running and at discovery and it
appears to stall discovery completion to the point of triggering hung
task timeouts.  So, revert the implementation for now.  When it returns
it will go into libsas proper.

The domain rediscovery that takes place due to ->lldd_I_T_nexus_reset()
events should now be properly waited for by the ata_port_wait_eh() call
in ata_port_probe().  So the hard coded delay in the isci
->lldd_I_T_nexus_reset() and other libsas drivers should help debounce
the libsas thread from seeing temporary device removals.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2011-10-31 13:23:01 +04:00

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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _ISCI_PORT_H_
#define _ISCI_PORT_H_
#include <scsi/libsas.h>
#include "isci.h"
#include "sas.h"
#include "phy.h"
#define SCIC_SDS_DUMMY_PORT 0xFF
struct isci_phy;
struct isci_host;
enum isci_status {
isci_freed = 0x00,
isci_starting = 0x01,
isci_ready = 0x02,
isci_ready_for_io = 0x03,
isci_stopping = 0x04,
isci_stopped = 0x05,
};
/**
* struct isci_port - isci direct attached sas port object
* @ready_exit: several states constitute 'ready'. When exiting ready we
* need to take extra port-teardown actions that are
* skipped when exiting to another 'ready' state.
* @logical_port_index: software port index
* @physical_port_index: hardware port index
* @active_phy_mask: identifies phy members
* @reserved_tag:
* @reserved_rni: reserver for port task scheduler workaround
* @started_request_count: reference count for outstanding commands
* @not_ready_reason: set during state transitions and notified
* @timer: timeout start/stop operations
*/
struct isci_port {
enum isci_status status;
struct isci_host *isci_host;
struct asd_sas_port sas_port;
struct list_head remote_dev_list;
spinlock_t state_lock;
struct list_head domain_dev_list;
struct completion start_complete;
struct completion hard_reset_complete;
enum sci_status hard_reset_status;
struct sci_base_state_machine sm;
bool ready_exit;
u8 logical_port_index;
u8 physical_port_index;
u8 active_phy_mask;
u8 last_active_phy;
u16 reserved_rni;
u16 reserved_tag;
u32 started_request_count;
u32 assigned_device_count;
u32 not_ready_reason;
struct isci_phy *phy_table[SCI_MAX_PHYS];
struct isci_host *owning_controller;
struct sci_timer timer;
struct scu_port_task_scheduler_registers __iomem *port_task_scheduler_registers;
/* XXX rework: only one register, no need to replicate per-port */
u32 __iomem *port_pe_configuration_register;
struct scu_viit_entry __iomem *viit_registers;
};
enum sci_port_not_ready_reason_code {
SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS,
SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED,
SCIC_PORT_NOT_READY_INVALID_PORT_CONFIGURATION,
SCIC_PORT_NOT_READY_RECONFIGURING,
SCIC_PORT_NOT_READY_REASON_CODE_MAX
};
struct sci_port_end_point_properties {
struct sci_sas_address sas_address;
struct sci_phy_proto protocols;
};
struct sci_port_properties {
u32 index;
struct sci_port_end_point_properties local;
struct sci_port_end_point_properties remote;
u32 phy_mask;
};
/**
* enum sci_port_states - This enumeration depicts all the states for the
* common port state machine.
*
*
*/
enum sci_port_states {
/**
* This state indicates that the port has successfully been stopped.
* In this state no new IO operations are permitted.
* This state is entered from the STOPPING state.
*/
SCI_PORT_STOPPED,
/**
* This state indicates that the port is in the process of stopping.
* In this state no new IO operations are permitted, but existing IO
* operations are allowed to complete.
* This state is entered from the READY state.
*/
SCI_PORT_STOPPING,
/**
* This state indicates the port is now ready. Thus, the user is
* able to perform IO operations on this port.
* This state is entered from the STARTING state.
*/
SCI_PORT_READY,
/**
* The substate where the port is started and ready but has no
* active phys.
*/
SCI_PORT_SUB_WAITING,
/**
* The substate where the port is started and ready and there is
* at least one phy operational.
*/
SCI_PORT_SUB_OPERATIONAL,
/**
* The substate where the port is started and there was an
* add/remove phy event. This state is only used in Automatic
* Port Configuration Mode (APC)
*/
SCI_PORT_SUB_CONFIGURING,
/**
* This state indicates the port is in the process of performing a hard
* reset. Thus, the user is unable to perform IO operations on this
* port.
* This state is entered from the READY state.
*/
SCI_PORT_RESETTING,
/**
* This state indicates the port has failed a reset request. This state
* is entered when a port reset request times out.
* This state is entered from the RESETTING state.
*/
SCI_PORT_FAILED,
};
static inline void sci_port_decrement_request_count(struct isci_port *iport)
{
if (WARN_ONCE(iport->started_request_count == 0,
"%s: tried to decrement started_request_count past 0!?",
__func__))
/* pass */;
else
iport->started_request_count--;
}
#define sci_port_active_phy(port, phy) \
(((port)->active_phy_mask & (1 << (phy)->phy_index)) != 0)
void sci_port_construct(
struct isci_port *iport,
u8 port_index,
struct isci_host *ihost);
enum sci_status sci_port_start(struct isci_port *iport);
enum sci_status sci_port_stop(struct isci_port *iport);
enum sci_status sci_port_add_phy(
struct isci_port *iport,
struct isci_phy *iphy);
enum sci_status sci_port_remove_phy(
struct isci_port *iport,
struct isci_phy *iphy);
void sci_port_setup_transports(
struct isci_port *iport,
u32 device_id);
void isci_port_bcn_enable(struct isci_host *, struct isci_port *);
void sci_port_deactivate_phy(
struct isci_port *iport,
struct isci_phy *iphy,
bool do_notify_user);
bool sci_port_link_detected(
struct isci_port *iport,
struct isci_phy *iphy);
enum sci_status sci_port_link_up(struct isci_port *iport,
struct isci_phy *iphy);
enum sci_status sci_port_link_down(struct isci_port *iport,
struct isci_phy *iphy);
struct isci_request;
struct isci_remote_device;
enum sci_status sci_port_start_io(
struct isci_port *iport,
struct isci_remote_device *idev,
struct isci_request *ireq);
enum sci_status sci_port_complete_io(
struct isci_port *iport,
struct isci_remote_device *idev,
struct isci_request *ireq);
enum sas_linkrate sci_port_get_max_allowed_speed(
struct isci_port *iport);
void sci_port_broadcast_change_received(
struct isci_port *iport,
struct isci_phy *iphy);
bool sci_port_is_valid_phy_assignment(
struct isci_port *iport,
u32 phy_index);
void sci_port_get_sas_address(
struct isci_port *iport,
struct sci_sas_address *sas_address);
void sci_port_get_attached_sas_address(
struct isci_port *iport,
struct sci_sas_address *sas_address);
enum isci_status isci_port_get_state(
struct isci_port *isci_port);
void isci_port_formed(struct asd_sas_phy *);
void isci_port_deformed(struct asd_sas_phy *);
void isci_port_init(
struct isci_port *port,
struct isci_host *host,
int index);
int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
struct isci_phy *iphy);
#endif /* !defined(_ISCI_PORT_H_) */
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