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ubuntu-linux-kernel/drivers/scsi/isci/port.c

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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.
*/
#include "isci.h"
#include "port.h"
#include "request.h"
#define SCIC_SDS_PORT_HARD_RESET_TIMEOUT (1000)
#define SCU_DUMMY_INDEX (0xFFFF)
#undef C
#define C(a) (#a)
const char *port_state_name(enum sci_port_states state)
{
static const char * const strings[] = PORT_STATES;
return strings[state];
}
#undef C
static struct device *sciport_to_dev(struct isci_port *iport)
{
int i = iport->physical_port_index;
struct isci_port *table;
struct isci_host *ihost;
if (i == SCIC_SDS_DUMMY_PORT)
i = SCI_MAX_PORTS+1;
table = iport - i;
ihost = container_of(table, typeof(*ihost), ports[0]);
return &ihost->pdev->dev;
}
static void sci_port_get_protocols(struct isci_port *iport, struct sci_phy_proto *proto)
{
u8 index;
proto->all = 0;
for (index = 0; index < SCI_MAX_PHYS; index++) {
struct isci_phy *iphy = iport->phy_table[index];
if (!iphy)
continue;
sci_phy_get_protocols(iphy, proto);
}
}
static u32 sci_port_get_phys(struct isci_port *iport)
{
u32 index;
u32 mask;
mask = 0;
for (index = 0; index < SCI_MAX_PHYS; index++)
if (iport->phy_table[index])
mask |= (1 << index);
return mask;
}
/**
* sci_port_get_properties() - This method simply returns the properties
* regarding the port, such as: physical index, protocols, sas address, etc.
* @port: this parameter specifies the port for which to retrieve the physical
* index.
* @properties: This parameter specifies the properties structure into which to
* copy the requested information.
*
* Indicate if the user specified a valid port. SCI_SUCCESS This value is
* returned if the specified port was valid. SCI_FAILURE_INVALID_PORT This
* value is returned if the specified port is not valid. When this value is
* returned, no data is copied to the properties output parameter.
*/
enum sci_status sci_port_get_properties(struct isci_port *iport,
struct sci_port_properties *prop)
{
if (!iport || iport->logical_port_index == SCIC_SDS_DUMMY_PORT)
return SCI_FAILURE_INVALID_PORT;
prop->index = iport->logical_port_index;
prop->phy_mask = sci_port_get_phys(iport);
sci_port_get_sas_address(iport, &prop->local.sas_address);
sci_port_get_protocols(iport, &prop->local.protocols);
sci_port_get_attached_sas_address(iport, &prop->remote.sas_address);
return SCI_SUCCESS;
}
static void sci_port_bcn_enable(struct isci_port *iport)
{
struct isci_phy *iphy;
u32 val;
int i;
for (i = 0; i < ARRAY_SIZE(iport->phy_table); i++) {
iphy = iport->phy_table[i];
if (!iphy)
continue;
val = readl(&iphy->link_layer_registers->link_layer_control);
/* clear the bit by writing 1. */
writel(val, &iphy->link_layer_registers->link_layer_control);
}
}
static void isci_port_bc_change_received(struct isci_host *ihost,
struct isci_port *iport,
struct isci_phy *iphy)
{
dev_dbg(&ihost->pdev->dev,
"%s: isci_phy = %p, sas_phy = %p\n",
__func__, iphy, &iphy->sas_phy);
ihost->sas_ha.notify_port_event(&iphy->sas_phy, PORTE_BROADCAST_RCVD);
sci_port_bcn_enable(iport);
}
static void isci_port_link_up(struct isci_host *isci_host,
struct isci_port *iport,
struct isci_phy *iphy)
{
unsigned long flags;
struct sci_port_properties properties;
unsigned long success = true;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p\n",
__func__, iport);
spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);
sci_port_get_properties(iport, &properties);
if (iphy->protocol == SAS_PROTOCOL_SATA) {
u64 attached_sas_address;
iphy->sas_phy.oob_mode = SATA_OOB_MODE;
iphy->sas_phy.frame_rcvd_size = sizeof(struct dev_to_host_fis);
/*
* For direct-attached SATA devices, the SCI core will
* automagically assign a SAS address to the end device
* for the purpose of creating a port. This SAS address
* will not be the same as assigned to the PHY and needs
* to be obtained from struct sci_port_properties properties.
*/
attached_sas_address = properties.remote.sas_address.high;
attached_sas_address <<= 32;
attached_sas_address |= properties.remote.sas_address.low;
swab64s(&attached_sas_address);
memcpy(&iphy->sas_phy.attached_sas_addr,
&attached_sas_address, sizeof(attached_sas_address));
} else if (iphy->protocol == SAS_PROTOCOL_SSP) {
iphy->sas_phy.oob_mode = SAS_OOB_MODE;
iphy->sas_phy.frame_rcvd_size = sizeof(struct sas_identify_frame);
/* Copy the attached SAS address from the IAF */
memcpy(iphy->sas_phy.attached_sas_addr,
iphy->frame_rcvd.iaf.sas_addr, SAS_ADDR_SIZE);
} else {
dev_err(&isci_host->pdev->dev, "%s: unknown target\n", __func__);
success = false;
}
iphy->sas_phy.phy->negotiated_linkrate = sci_phy_linkrate(iphy);
spin_unlock_irqrestore(&iphy->sas_phy.frame_rcvd_lock, flags);
/* Notify libsas that we have an address frame, if indeed
* we've found an SSP, SMP, or STP target */
if (success)
isci_host->sas_ha.notify_port_event(&iphy->sas_phy,
PORTE_BYTES_DMAED);
}
/**
* isci_port_link_down() - This function is called by the sci core when a link
* becomes inactive.
* @isci_host: This parameter specifies the isci host object.
* @phy: This parameter specifies the isci phy with the active link.
* @port: This parameter specifies the isci port with the active link.
*
*/
static void isci_port_link_down(struct isci_host *isci_host,
struct isci_phy *isci_phy,
struct isci_port *isci_port)
{
struct isci_remote_device *isci_device;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p\n", __func__, isci_port);
if (isci_port) {
/* check to see if this is the last phy on this port. */
if (isci_phy->sas_phy.port &&
isci_phy->sas_phy.port->num_phys == 1) {
/* change the state for all devices on this port. The
* next task sent to this device will be returned as
* SAS_TASK_UNDELIVERED, and the scsi mid layer will
* remove the target
*/
list_for_each_entry(isci_device,
&isci_port->remote_dev_list,
node) {
dev_dbg(&isci_host->pdev->dev,
"%s: isci_device = %p\n",
__func__, isci_device);
set_bit(IDEV_GONE, &isci_device->flags);
}
}
}
/* Notify libsas of the borken link, this will trigger calls to our
* isci_port_deformed and isci_dev_gone functions.
*/
sas_phy_disconnected(&isci_phy->sas_phy);
isci_host->sas_ha.notify_phy_event(&isci_phy->sas_phy,
PHYE_LOSS_OF_SIGNAL);
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p - Done\n", __func__, isci_port);
}
static bool is_port_ready_state(enum sci_port_states state)
{
switch (state) {
case SCI_PORT_READY:
case SCI_PORT_SUB_WAITING:
case SCI_PORT_SUB_OPERATIONAL:
case SCI_PORT_SUB_CONFIGURING:
return true;
default:
return false;
}
}
/* flag dummy rnc hanling when exiting a ready state */
static void port_state_machine_change(struct isci_port *iport,
enum sci_port_states state)
{
struct sci_base_state_machine *sm = &iport->sm;
enum sci_port_states old_state = sm->current_state_id;
if (is_port_ready_state(old_state) && !is_port_ready_state(state))
iport->ready_exit = true;
sci_change_state(sm, state);
iport->ready_exit = false;
}
/**
* isci_port_hard_reset_complete() - This function is called by the sci core
* when the hard reset complete notification has been received.
* @port: This parameter specifies the sci port with the active link.
* @completion_status: This parameter specifies the core status for the reset
* process.
*
*/
static void isci_port_hard_reset_complete(struct isci_port *isci_port,
enum sci_status completion_status)
{
struct isci_host *ihost = isci_port->owning_controller;
dev_dbg(&ihost->pdev->dev,
"%s: isci_port = %p, completion_status=%x\n",
__func__, isci_port, completion_status);
/* Save the status of the hard reset from the port. */
isci_port->hard_reset_status = completion_status;
if (completion_status != SCI_SUCCESS) {
/* The reset failed. The port state is now SCI_PORT_FAILED. */
if (isci_port->active_phy_mask == 0) {
int phy_idx = isci_port->last_active_phy;
struct isci_phy *iphy = &ihost->phys[phy_idx];
/* Generate the link down now to the host, since it
* was intercepted by the hard reset state machine when
* it really happened.
*/
isci_port_link_down(ihost, iphy, isci_port);
}
/* Advance the port state so that link state changes will be
* noticed.
*/
port_state_machine_change(isci_port, SCI_PORT_SUB_WAITING);
}
clear_bit(IPORT_RESET_PENDING, &isci_port->state);
wake_up(&ihost->eventq);
}
/* This method will return a true value if the specified phy can be assigned to
* this port The following is a list of phys for each port that are allowed: -
* Port 0 - 3 2 1 0 - Port 1 - 1 - Port 2 - 3 2 - Port 3 - 3 This method
* doesn't preclude all configurations. It merely ensures that a phy is part
* of the allowable set of phy identifiers for that port. For example, one
* could assign phy 3 to port 0 and no other phys. Please refer to
* sci_port_is_phy_mask_valid() for information regarding whether the
* phy_mask for a port can be supported. bool true if this is a valid phy
* assignment for the port false if this is not a valid phy assignment for the
* port
*/
bool sci_port_is_valid_phy_assignment(struct isci_port *iport, u32 phy_index)
{
struct isci_host *ihost = iport->owning_controller;
struct sci_user_parameters *user = &ihost->user_parameters;
/* Initialize to invalid value. */
u32 existing_phy_index = SCI_MAX_PHYS;
u32 index;
if ((iport->physical_port_index == 1) && (phy_index != 1))
return false;
if (iport->physical_port_index == 3 && phy_index != 3)
return false;
if (iport->physical_port_index == 2 &&
(phy_index == 0 || phy_index == 1))
return false;
for (index = 0; index < SCI_MAX_PHYS; index++)
if (iport->phy_table[index] && index != phy_index)
existing_phy_index = index;
/* Ensure that all of the phys in the port are capable of
* operating at the same maximum link rate.
*/
if (existing_phy_index < SCI_MAX_PHYS &&
user->phys[phy_index].max_speed_generation !=
user->phys[existing_phy_index].max_speed_generation)
return false;
return true;
}
/**
*
* @sci_port: This is the port object for which to determine if the phy mask
* can be supported.
*
* This method will return a true value if the port's phy mask can be supported
* by the SCU. The following is a list of valid PHY mask configurations for
* each port: - Port 0 - [[3 2] 1] 0 - Port 1 - [1] - Port 2 - [[3] 2]
* - Port 3 - [3] This method returns a boolean indication specifying if the
* phy mask can be supported. true if this is a valid phy assignment for the
* port false if this is not a valid phy assignment for the port
*/
static bool sci_port_is_phy_mask_valid(
struct isci_port *iport,
u32 phy_mask)
{
if (iport->physical_port_index == 0) {
if (((phy_mask & 0x0F) == 0x0F)
|| ((phy_mask & 0x03) == 0x03)
|| ((phy_mask & 0x01) == 0x01)
|| (phy_mask == 0))
return true;
} else if (iport->physical_port_index == 1) {
if (((phy_mask & 0x02) == 0x02)
|| (phy_mask == 0))
return true;
} else if (iport->physical_port_index == 2) {
if (((phy_mask & 0x0C) == 0x0C)
|| ((phy_mask & 0x04) == 0x04)
|| (phy_mask == 0))
return true;
} else if (iport->physical_port_index == 3) {
if (((phy_mask & 0x08) == 0x08)
|| (phy_mask == 0))
return true;
}
return false;
}
/*
* This method retrieves a currently active (i.e. connected) phy contained in
* the port. Currently, the lowest order phy that is connected is returned.
* This method returns a pointer to a SCIS_SDS_PHY object. NULL This value is
* returned if there are no currently active (i.e. connected to a remote end
* point) phys contained in the port. All other values specify a struct sci_phy
* object that is active in the port.
*/
static struct isci_phy *sci_port_get_a_connected_phy(struct isci_port *iport)
{
u32 index;
struct isci_phy *iphy;
for (index = 0; index < SCI_MAX_PHYS; index++) {
/* Ensure that the phy is both part of the port and currently
* connected to the remote end-point.
*/
iphy = iport->phy_table[index];
if (iphy && sci_port_active_phy(iport, iphy))
return iphy;
}
return NULL;
}
static enum sci_status sci_port_set_phy(struct isci_port *iport, struct isci_phy *iphy)
{
/* Check to see if we can add this phy to a port
* that means that the phy is not part of a port and that the port does
* not already have a phy assinged to the phy index.
*/
if (!iport->phy_table[iphy->phy_index] &&
!phy_get_non_dummy_port(iphy) &&
sci_port_is_valid_phy_assignment(iport, iphy->phy_index)) {
/* Phy is being added in the stopped state so we are in MPC mode
* make logical port index = physical port index
*/
iport->logical_port_index = iport->physical_port_index;
iport->phy_table[iphy->phy_index] = iphy;
sci_phy_set_port(iphy, iport);
return SCI_SUCCESS;
}
return SCI_FAILURE;
}
static enum sci_status sci_port_clear_phy(struct isci_port *iport, struct isci_phy *iphy)
{
/* Make sure that this phy is part of this port */
if (iport->phy_table[iphy->phy_index] == iphy &&
phy_get_non_dummy_port(iphy) == iport) {
struct isci_host *ihost = iport->owning_controller;
/* Yep it is assigned to this port so remove it */
sci_phy_set_port(iphy, &ihost->ports[SCI_MAX_PORTS]);
iport->phy_table[iphy->phy_index] = NULL;
return SCI_SUCCESS;
}
return SCI_FAILURE;
}
void sci_port_get_sas_address(struct isci_port *iport, struct sci_sas_address *sas)
{
u32 index;
sas->high = 0;
sas->low = 0;
for (index = 0; index < SCI_MAX_PHYS; index++)
if (iport->phy_table[index])
sci_phy_get_sas_address(iport->phy_table[index], sas);
}
void sci_port_get_attached_sas_address(struct isci_port *iport, struct sci_sas_address *sas)
{
struct isci_phy *iphy;
/*
* Ensure that the phy is both part of the port and currently
* connected to the remote end-point.
*/
iphy = sci_port_get_a_connected_phy(iport);
if (iphy) {
if (iphy->protocol != SAS_PROTOCOL_SATA) {
sci_phy_get_attached_sas_address(iphy, sas);
} else {
sci_phy_get_sas_address(iphy, sas);
sas->low += iphy->phy_index;
}
} else {
sas->high = 0;
sas->low = 0;
}
}
/**
* sci_port_construct_dummy_rnc() - create dummy rnc for si workaround
*
* @sci_port: logical port on which we need to create the remote node context
* @rni: remote node index for this remote node context.
*
* This routine will construct a dummy remote node context data structure
* This structure will be posted to the hardware to work around a scheduler
* error in the hardware.
*/
static void sci_port_construct_dummy_rnc(struct isci_port *iport, u16 rni)
{
union scu_remote_node_context *rnc;
rnc = &iport->owning_controller->remote_node_context_table[rni];
memset(rnc, 0, sizeof(union scu_remote_node_context));
rnc->ssp.remote_sas_address_hi = 0;
rnc->ssp.remote_sas_address_lo = 0;
rnc->ssp.remote_node_index = rni;
rnc->ssp.remote_node_port_width = 1;
rnc->ssp.logical_port_index = iport->physical_port_index;
rnc->ssp.nexus_loss_timer_enable = false;
rnc->ssp.check_bit = false;
rnc->ssp.is_valid = true;
rnc->ssp.is_remote_node_context = true;
rnc->ssp.function_number = 0;
rnc->ssp.arbitration_wait_time = 0;
}
/*
* construct a dummy task context data structure. This
* structure will be posted to the hardwre to work around a scheduler error
* in the hardware.
*/
static void sci_port_construct_dummy_task(struct isci_port *iport, u16 tag)
{
struct isci_host *ihost = iport->owning_controller;
struct scu_task_context *task_context;
task_context = &ihost->task_context_table[ISCI_TAG_TCI(tag)];
memset(task_context, 0, sizeof(struct scu_task_context));
task_context->initiator_request = 1;
task_context->connection_rate = 1;
task_context->logical_port_index = iport->physical_port_index;
task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
task_context->task_index = ISCI_TAG_TCI(tag);
task_context->valid = SCU_TASK_CONTEXT_VALID;
task_context->context_type = SCU_TASK_CONTEXT_TYPE;
task_context->remote_node_index = iport->reserved_rni;
task_context->do_not_dma_ssp_good_response = 1;
task_context->task_phase = 0x01;
}
static void sci_port_destroy_dummy_resources(struct isci_port *iport)
{
struct isci_host *ihost = iport->owning_controller;
if (iport->reserved_tag != SCI_CONTROLLER_INVALID_IO_TAG)
isci_free_tag(ihost, iport->reserved_tag);
if (iport->reserved_rni != SCU_DUMMY_INDEX)
sci_remote_node_table_release_remote_node_index(&ihost->available_remote_nodes,
1, iport->reserved_rni);
iport->reserved_rni = SCU_DUMMY_INDEX;
iport->reserved_tag = SCI_CONTROLLER_INVALID_IO_TAG;
}
void sci_port_setup_transports(struct isci_port *iport, u32 device_id)
{
u8 index;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (iport->active_phy_mask & (1 << index))
sci_phy_setup_transport(iport->phy_table[index], device_id);
}
}
static void sci_port_resume_phy(struct isci_port *iport, struct isci_phy *iphy)
{
sci_phy_resume(iphy);
iport->enabled_phy_mask |= 1 << iphy->phy_index;
}
static void sci_port_activate_phy(struct isci_port *iport,
struct isci_phy *iphy,
u8 flags)
{
struct isci_host *ihost = iport->owning_controller;
if (iphy->protocol != SAS_PROTOCOL_SATA && (flags & PF_RESUME))
sci_phy_resume(iphy);
iport->active_phy_mask |= 1 << iphy->phy_index;
sci_controller_clear_invalid_phy(ihost, iphy);
if (flags & PF_NOTIFY)
isci_port_link_up(ihost, iport, iphy);
}
void sci_port_deactivate_phy(struct isci_port *iport, struct isci_phy *iphy,
bool do_notify_user)
{
struct isci_host *ihost = iport->owning_controller;
iport->active_phy_mask &= ~(1 << iphy->phy_index);
iport->enabled_phy_mask &= ~(1 << iphy->phy_index);
if (!iport->active_phy_mask)
iport->last_active_phy = iphy->phy_index;
iphy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN;
/* Re-assign the phy back to the LP as if it were a narrow port for APC
* mode. For MPC mode, the phy will remain in the port.
*/
if (iport->owning_controller->oem_parameters.controller.mode_type ==
SCIC_PORT_AUTOMATIC_CONFIGURATION_MODE)
writel(iphy->phy_index,
&iport->port_pe_configuration_register[iphy->phy_index]);
if (do_notify_user == true)
isci_port_link_down(ihost, iphy, iport);
}
static void sci_port_invalid_link_up(struct isci_port *iport, struct isci_phy *iphy)
{
struct isci_host *ihost = iport->owning_controller;
/*
* Check to see if we have alreay reported this link as bad and if
* not go ahead and tell the SCI_USER that we have discovered an
* invalid link.
*/
if ((ihost->invalid_phy_mask & (1 << iphy->phy_index)) == 0) {
ihost->invalid_phy_mask |= 1 << iphy->phy_index;
dev_warn(&ihost->pdev->dev, "Invalid link up!\n");
}
}
/**
* sci_port_general_link_up_handler - phy can be assigned to port?
* @sci_port: sci_port object for which has a phy that has gone link up.
* @sci_phy: This is the struct isci_phy object that has gone link up.
* @flags: PF_RESUME, PF_NOTIFY to sci_port_activate_phy
*
* Determine if this phy can be assigned to this port . If the phy is
* not a valid PHY for this port then the function will notify the user.
* A PHY can only be part of a port if it's attached SAS ADDRESS is the
* same as all other PHYs in the same port.
*/
static void sci_port_general_link_up_handler(struct isci_port *iport,
struct isci_phy *iphy,
u8 flags)
{
struct sci_sas_address port_sas_address;
struct sci_sas_address phy_sas_address;
sci_port_get_attached_sas_address(iport, &port_sas_address);
sci_phy_get_attached_sas_address(iphy, &phy_sas_address);
/* If the SAS address of the new phy matches the SAS address of
* other phys in the port OR this is the first phy in the port,
* then activate the phy and allow it to be used for operations
* in this port.
*/
if ((phy_sas_address.high == port_sas_address.high &&
phy_sas_address.low == port_sas_address.low) ||
iport->active_phy_mask == 0) {
struct sci_base_state_machine *sm = &iport->sm;
sci_port_activate_phy(iport, iphy, flags);
if (sm->current_state_id == SCI_PORT_RESETTING)
port_state_machine_change(iport, SCI_PORT_READY);
} else
sci_port_invalid_link_up(iport, iphy);
}
/**
* This method returns false if the port only has a single phy object assigned.
* If there are no phys or more than one phy then the method will return
* true.
* @sci_port: The port for which the wide port condition is to be checked.
*
* bool true Is returned if this is a wide ported port. false Is returned if
* this is a narrow port.
*/
static bool sci_port_is_wide(struct isci_port *iport)
{
u32 index;
u32 phy_count = 0;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (iport->phy_table[index] != NULL) {
phy_count++;
}
}
return phy_count != 1;
}
/**
* This method is called by the PHY object when the link is detected. if the
* port wants the PHY to continue on to the link up state then the port
* layer must return true. If the port object returns false the phy object
* must halt its attempt to go link up.
* @sci_port: The port associated with the phy object.
* @sci_phy: The phy object that is trying to go link up.
*
* true if the phy object can continue to the link up condition. true Is
* returned if this phy can continue to the ready state. false Is returned if
* can not continue on to the ready state. This notification is in place for
* wide ports and direct attached phys. Since there are no wide ported SATA
* devices this could become an invalid port configuration.
*/
bool sci_port_link_detected(struct isci_port *iport, struct isci_phy *iphy)
{
if ((iport->logical_port_index != SCIC_SDS_DUMMY_PORT) &&
(iphy->protocol == SAS_PROTOCOL_SATA)) {
if (sci_port_is_wide(iport)) {
sci_port_invalid_link_up(iport, iphy);
return false;
} else {
struct isci_host *ihost = iport->owning_controller;
struct isci_port *dst_port = &(ihost->ports[iphy->phy_index]);
writel(iphy->phy_index,
&dst_port->port_pe_configuration_register[iphy->phy_index]);
}
}
return true;
}
static void port_timeout(struct timer_list *t)
{
struct sci_timer *tmr = from_timer(tmr, t, timer);
struct isci_port *iport = container_of(tmr, typeof(*iport), timer);
struct isci_host *ihost = iport->owning_controller;
unsigned long flags;
u32 current_state;
spin_lock_irqsave(&ihost->scic_lock, flags);
if (tmr->cancel)
goto done;
current_state = iport->sm.current_state_id;
if (current_state == SCI_PORT_RESETTING) {
/* if the port is still in the resetting state then the timeout
* fired before the reset completed.
*/
port_state_machine_change(iport, SCI_PORT_FAILED);
} else if (current_state == SCI_PORT_STOPPED) {
/* if the port is stopped then the start request failed In this
* case stay in the stopped state.
*/
dev_err(sciport_to_dev(iport),
"%s: SCIC Port 0x%p failed to stop before timeout.\n",
__func__,
iport);
} else if (current_state == SCI_PORT_STOPPING) {
dev_dbg(sciport_to_dev(iport),
"%s: port%d: stop complete timeout\n",
__func__, iport->physical_port_index);
} else {
/* The port is in the ready state and we have a timer
* reporting a timeout this should not happen.
*/
dev_err(sciport_to_dev(iport),
"%s: SCIC Port 0x%p is processing a timeout operation "
"in state %d.\n", __func__, iport, current_state);
}
done:
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
/* --------------------------------------------------------------------------- */
/**
* This function updates the hardwares VIIT entry for this port.
*
*
*/
static void sci_port_update_viit_entry(struct isci_port *iport)
{
struct sci_sas_address sas_address;
sci_port_get_sas_address(iport, &sas_address);
writel(sas_address.high,
&iport->viit_registers->initiator_sas_address_hi);
writel(sas_address.low,
&iport->viit_registers->initiator_sas_address_lo);
/* This value get cleared just in case its not already cleared */
writel(0, &iport->viit_registers->reserved);
/* We are required to update the status register last */
writel(SCU_VIIT_ENTRY_ID_VIIT |
SCU_VIIT_IPPT_INITIATOR |
((1 << iport->physical_port_index) << SCU_VIIT_ENTRY_LPVIE_SHIFT) |
SCU_VIIT_STATUS_ALL_VALID,
&iport->viit_registers->status);
}
enum sas_linkrate sci_port_get_max_allowed_speed(struct isci_port *iport)
{
u16 index;
struct isci_phy *iphy;
enum sas_linkrate max_allowed_speed = SAS_LINK_RATE_6_0_GBPS;
/*
* Loop through all of the phys in this port and find the phy with the
* lowest maximum link rate. */
for (index = 0; index < SCI_MAX_PHYS; index++) {
iphy = iport->phy_table[index];
if (iphy && sci_port_active_phy(iport, iphy) &&
iphy->max_negotiated_speed < max_allowed_speed)
max_allowed_speed = iphy->max_negotiated_speed;
}
return max_allowed_speed;
}
static void sci_port_suspend_port_task_scheduler(struct isci_port *iport)
{
u32 pts_control_value;
pts_control_value = readl(&iport->port_task_scheduler_registers->control);
pts_control_value |= SCU_PTSxCR_GEN_BIT(SUSPEND);
writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}
/**
* sci_port_post_dummy_request() - post dummy/workaround request
* @sci_port: port to post task
*
* Prevent the hardware scheduler from posting new requests to the front
* of the scheduler queue causing a starvation problem for currently
* ongoing requests.
*
*/
static void sci_port_post_dummy_request(struct isci_port *iport)
{
struct isci_host *ihost = iport->owning_controller;
u16 tag = iport->reserved_tag;
struct scu_task_context *tc;
u32 command;
tc = &ihost->task_context_table[ISCI_TAG_TCI(tag)];
tc->abort = 0;
command = SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
ISCI_TAG_TCI(tag);
sci_controller_post_request(ihost, command);
}
/**
* This routine will abort the dummy request. This will alow the hardware to
* power down parts of the silicon to save power.
*
* @sci_port: The port on which the task must be aborted.
*
*/
static void sci_port_abort_dummy_request(struct isci_port *iport)
{
struct isci_host *ihost = iport->owning_controller;
u16 tag = iport->reserved_tag;
struct scu_task_context *tc;
u32 command;
tc = &ihost->task_context_table[ISCI_TAG_TCI(tag)];
tc->abort = 1;
command = SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT |
iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
ISCI_TAG_TCI(tag);
sci_controller_post_request(ihost, command);
}
/**
*
* @sci_port: This is the struct isci_port object to resume.
*
* This method will resume the port task scheduler for this port object. none
*/
static void
sci_port_resume_port_task_scheduler(struct isci_port *iport)
{
u32 pts_control_value;
pts_control_value = readl(&iport->port_task_scheduler_registers->control);
pts_control_value &= ~SCU_PTSxCR_GEN_BIT(SUSPEND);
writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}
static void sci_port_ready_substate_waiting_enter(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
sci_port_suspend_port_task_scheduler(iport);
iport->not_ready_reason = SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS;
if (iport->active_phy_mask != 0) {
/* At least one of the phys on the port is ready */
port_state_machine_change(iport,
SCI_PORT_SUB_OPERATIONAL);
}
}
static void scic_sds_port_ready_substate_waiting_exit(
struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
sci_port_resume_port_task_scheduler(iport);
}
static void sci_port_ready_substate_operational_enter(struct sci_base_state_machine *sm)
{
u32 index;
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
struct isci_host *ihost = iport->owning_controller;
dev_dbg(&ihost->pdev->dev, "%s: port%d ready\n",
__func__, iport->physical_port_index);
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (iport->phy_table[index]) {
writel(iport->physical_port_index,
&iport->port_pe_configuration_register[
iport->phy_table[index]->phy_index]);
if (((iport->active_phy_mask^iport->enabled_phy_mask) & (1 << index)) != 0)
sci_port_resume_phy(iport, iport->phy_table[index]);
}
}
sci_port_update_viit_entry(iport);
/*
* Post the dummy task for the port so the hardware can schedule
* io correctly
*/
sci_port_post_dummy_request(iport);
}
static void sci_port_invalidate_dummy_remote_node(struct isci_port *iport)
{
struct isci_host *ihost = iport->owning_controller;
u8 phys_index = iport->physical_port_index;
union scu_remote_node_context *rnc;
u16 rni = iport->reserved_rni;
u32 command;
rnc = &ihost->remote_node_context_table[rni];
rnc->ssp.is_valid = false;
/* ensure the preceding tc abort request has reached the
* controller and give it ample time to act before posting the rnc
* invalidate
*/
readl(&ihost->smu_registers->interrupt_status); /* flush */
udelay(10);
command = SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE |
phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;
sci_controller_post_request(ihost, command);
}
/**
*
* @object: This is the object which is cast to a struct isci_port object.
*
* This method will perform the actions required by the struct isci_port on
* exiting the SCI_PORT_SUB_OPERATIONAL. This function reports
* the port not ready and suspends the port task scheduler. none
*/
static void sci_port_ready_substate_operational_exit(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
struct isci_host *ihost = iport->owning_controller;
/*
* Kill the dummy task for this port if it has not yet posted
* the hardware will treat this as a NOP and just return abort
* complete.
*/
sci_port_abort_dummy_request(iport);
dev_dbg(&ihost->pdev->dev, "%s: port%d !ready\n",
__func__, iport->physical_port_index);
if (iport->ready_exit)
sci_port_invalidate_dummy_remote_node(iport);
}
static void sci_port_ready_substate_configuring_enter(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
struct isci_host *ihost = iport->owning_controller;
if (iport->active_phy_mask == 0) {
dev_dbg(&ihost->pdev->dev, "%s: port%d !ready\n",
__func__, iport->physical_port_index);
port_state_machine_change(iport, SCI_PORT_SUB_WAITING);
} else
port_state_machine_change(iport, SCI_PORT_SUB_OPERATIONAL);
}
enum sci_status sci_port_start(struct isci_port *iport)
{
struct isci_host *ihost = iport->owning_controller;
enum sci_status status = SCI_SUCCESS;
enum sci_port_states state;
u32 phy_mask;
state = iport->sm.current_state_id;
if (state != SCI_PORT_STOPPED) {
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
if (iport->assigned_device_count > 0) {
/* TODO This is a start failure operation because
* there are still devices assigned to this port.
* There must be no devices assigned to a port on a
* start operation.
*/
return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
}
if (iport->reserved_rni == SCU_DUMMY_INDEX) {
u16 rni = sci_remote_node_table_allocate_remote_node(
&ihost->available_remote_nodes, 1);
if (rni != SCU_DUMMY_INDEX)
sci_port_construct_dummy_rnc(iport, rni);
else
status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
iport->reserved_rni = rni;
}
if (iport->reserved_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
u16 tag;
tag = isci_alloc_tag(ihost);
if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
else
sci_port_construct_dummy_task(iport, tag);
iport->reserved_tag = tag;
}
if (status == SCI_SUCCESS) {
phy_mask = sci_port_get_phys(iport);
/*
* There are one or more phys assigned to this port. Make sure
* the port's phy mask is in fact legal and supported by the
* silicon.
*/
if (sci_port_is_phy_mask_valid(iport, phy_mask) == true) {
port_state_machine_change(iport,
SCI_PORT_READY);
return SCI_SUCCESS;
}
status = SCI_FAILURE;
}
if (status != SCI_SUCCESS)
sci_port_destroy_dummy_resources(iport);
return status;
}
enum sci_status sci_port_stop(struct isci_port *iport)
{
enum sci_port_states state;
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_STOPPED:
return SCI_SUCCESS;
case SCI_PORT_SUB_WAITING:
case SCI_PORT_SUB_OPERATIONAL:
case SCI_PORT_SUB_CONFIGURING:
case SCI_PORT_RESETTING:
port_state_machine_change(iport,
SCI_PORT_STOPPING);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
static enum sci_status sci_port_hard_reset(struct isci_port *iport, u32 timeout)
{
enum sci_status status = SCI_FAILURE_INVALID_PHY;
struct isci_phy *iphy = NULL;
enum sci_port_states state;
u32 phy_index;
state = iport->sm.current_state_id;
if (state != SCI_PORT_SUB_OPERATIONAL) {
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
/* Select a phy on which we can send the hard reset request. */
for (phy_index = 0; phy_index < SCI_MAX_PHYS && !iphy; phy_index++) {
iphy = iport->phy_table[phy_index];
if (iphy && !sci_port_active_phy(iport, iphy)) {
/*
* We found a phy but it is not ready select
* different phy
*/
iphy = NULL;
}
}
/* If we have a phy then go ahead and start the reset procedure */
if (!iphy)
return status;
status = sci_phy_reset(iphy);
if (status != SCI_SUCCESS)
return status;
sci_mod_timer(&iport->timer, timeout);
iport->not_ready_reason = SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED;
port_state_machine_change(iport, SCI_PORT_RESETTING);
return SCI_SUCCESS;
}
/**
* sci_port_add_phy() -
* @sci_port: This parameter specifies the port in which the phy will be added.
* @sci_phy: This parameter is the phy which is to be added to the port.
*
* This method will add a PHY to the selected port. This method returns an
* enum sci_status. SCI_SUCCESS the phy has been added to the port. Any other
* status is a failure to add the phy to the port.
*/
enum sci_status sci_port_add_phy(struct isci_port *iport,
struct isci_phy *iphy)
{
enum sci_status status;
enum sci_port_states state;
sci_port_bcn_enable(iport);
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_STOPPED: {
struct sci_sas_address port_sas_address;
/* Read the port assigned SAS Address if there is one */
sci_port_get_sas_address(iport, &port_sas_address);
if (port_sas_address.high != 0 && port_sas_address.low != 0) {
struct sci_sas_address phy_sas_address;
/* Make sure that the PHY SAS Address matches the SAS Address
* for this port
*/
sci_phy_get_sas_address(iphy, &phy_sas_address);
if (port_sas_address.high != phy_sas_address.high ||
port_sas_address.low != phy_sas_address.low)
return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
}
return sci_port_set_phy(iport, iphy);
}
case SCI_PORT_SUB_WAITING:
case SCI_PORT_SUB_OPERATIONAL:
status = sci_port_set_phy(iport, iphy);
if (status != SCI_SUCCESS)
return status;
sci_port_general_link_up_handler(iport, iphy, PF_NOTIFY|PF_RESUME);
iport->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;
port_state_machine_change(iport, SCI_PORT_SUB_CONFIGURING);
return status;
case SCI_PORT_SUB_CONFIGURING:
status = sci_port_set_phy(iport, iphy);
if (status != SCI_SUCCESS)
return status;
sci_port_general_link_up_handler(iport, iphy, PF_NOTIFY);
/* Re-enter the configuring state since this may be the last phy in
* the port.
*/
port_state_machine_change(iport,
SCI_PORT_SUB_CONFIGURING);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
/**
* sci_port_remove_phy() -
* @sci_port: This parameter specifies the port in which the phy will be added.
* @sci_phy: This parameter is the phy which is to be added to the port.
*
* This method will remove the PHY from the selected PORT. This method returns
* an enum sci_status. SCI_SUCCESS the phy has been removed from the port. Any
* other status is a failure to add the phy to the port.
*/
enum sci_status sci_port_remove_phy(struct isci_port *iport,
struct isci_phy *iphy)
{
enum sci_status status;
enum sci_port_states state;
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_STOPPED:
return sci_port_clear_phy(iport, iphy);
case SCI_PORT_SUB_OPERATIONAL:
status = sci_port_clear_phy(iport, iphy);
if (status != SCI_SUCCESS)
return status;
sci_port_deactivate_phy(iport, iphy, true);
iport->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;
port_state_machine_change(iport,
SCI_PORT_SUB_CONFIGURING);
return SCI_SUCCESS;
case SCI_PORT_SUB_CONFIGURING:
status = sci_port_clear_phy(iport, iphy);
if (status != SCI_SUCCESS)
return status;
sci_port_deactivate_phy(iport, iphy, true);
/* Re-enter the configuring state since this may be the last phy in
* the port
*/
port_state_machine_change(iport,
SCI_PORT_SUB_CONFIGURING);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status sci_port_link_up(struct isci_port *iport,
struct isci_phy *iphy)
{
enum sci_port_states state;
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_SUB_WAITING:
/* Since this is the first phy going link up for the port we
* can just enable it and continue
*/
sci_port_activate_phy(iport, iphy, PF_NOTIFY|PF_RESUME);
port_state_machine_change(iport,
SCI_PORT_SUB_OPERATIONAL);
return SCI_SUCCESS;
case SCI_PORT_SUB_OPERATIONAL:
sci_port_general_link_up_handler(iport, iphy, PF_NOTIFY|PF_RESUME);
return SCI_SUCCESS;
case SCI_PORT_RESETTING:
/* TODO We should make sure that the phy that has gone
* link up is the same one on which we sent the reset. It is
* possible that the phy on which we sent the reset is not the
* one that has gone link up and we want to make sure that
* phy being reset comes back. Consider the case where a
* reset is sent but before the hardware processes the reset it
* get a link up on the port because of a hot plug event.
* because of the reset request this phy will go link down
* almost immediately.
*/
/* In the resetting state we don't notify the user regarding
* link up and link down notifications.
*/
sci_port_general_link_up_handler(iport, iphy, PF_RESUME);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status sci_port_link_down(struct isci_port *iport,
struct isci_phy *iphy)
{
enum sci_port_states state;
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_SUB_OPERATIONAL:
sci_port_deactivate_phy(iport, iphy, true);
/* If there are no active phys left in the port, then
* transition the port to the WAITING state until such time
* as a phy goes link up
*/
if (iport->active_phy_mask == 0)
port_state_machine_change(iport,
SCI_PORT_SUB_WAITING);
return SCI_SUCCESS;
case SCI_PORT_RESETTING:
/* In the resetting state we don't notify the user regarding
* link up and link down notifications. */
sci_port_deactivate_phy(iport, iphy, false);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status sci_port_start_io(struct isci_port *iport,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
enum sci_port_states state;
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_SUB_WAITING:
return SCI_FAILURE_INVALID_STATE;
case SCI_PORT_SUB_OPERATIONAL:
iport->started_request_count++;
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status sci_port_complete_io(struct isci_port *iport,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
enum sci_port_states state;
state = iport->sm.current_state_id;
switch (state) {
case SCI_PORT_STOPPED:
dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
__func__, port_state_name(state));
return SCI_FAILURE_INVALID_STATE;
case SCI_PORT_STOPPING:
sci_port_decrement_request_count(iport);
if (iport->started_request_count == 0)
port_state_machine_change(iport,
SCI_PORT_STOPPED);
break;
case SCI_PORT_READY:
case SCI_PORT_RESETTING:
case SCI_PORT_FAILED:
case SCI_PORT_SUB_WAITING:
case SCI_PORT_SUB_OPERATIONAL:
sci_port_decrement_request_count(iport);
break;
case SCI_PORT_SUB_CONFIGURING:
sci_port_decrement_request_count(iport);
if (iport->started_request_count == 0) {
port_state_machine_change(iport,
SCI_PORT_SUB_OPERATIONAL);
}
break;
}
return SCI_SUCCESS;
}
static void sci_port_enable_port_task_scheduler(struct isci_port *iport)
{
u32 pts_control_value;
/* enable the port task scheduler in a suspended state */
pts_control_value = readl(&iport->port_task_scheduler_registers->control);
pts_control_value |= SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND);
writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}
static void sci_port_disable_port_task_scheduler(struct isci_port *iport)
{
u32 pts_control_value;
pts_control_value = readl(&iport->port_task_scheduler_registers->control);
pts_control_value &=
~(SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND));
writel(pts_control_value, &iport->port_task_scheduler_registers->control);
}
static void sci_port_post_dummy_remote_node(struct isci_port *iport)
{
struct isci_host *ihost = iport->owning_controller;
u8 phys_index = iport->physical_port_index;
union scu_remote_node_context *rnc;
u16 rni = iport->reserved_rni;
u32 command;
rnc = &ihost->remote_node_context_table[rni];
rnc->ssp.is_valid = true;
command = SCU_CONTEXT_COMMAND_POST_RNC_32 |
phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;
sci_controller_post_request(ihost, command);
/* ensure hardware has seen the post rnc command and give it
* ample time to act before sending the suspend
*/
readl(&ihost->smu_registers->interrupt_status); /* flush */
udelay(10);
command = SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX |
phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;
sci_controller_post_request(ihost, command);
}
static void sci_port_stopped_state_enter(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
if (iport->sm.previous_state_id == SCI_PORT_STOPPING) {
/*
* If we enter this state becasuse of a request to stop
* the port then we want to disable the hardwares port
* task scheduler. */
sci_port_disable_port_task_scheduler(iport);
}
}
static void sci_port_stopped_state_exit(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
/* Enable and suspend the port task scheduler */
sci_port_enable_port_task_scheduler(iport);
}
static void sci_port_ready_state_enter(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
struct isci_host *ihost = iport->owning_controller;
u32 prev_state;
prev_state = iport->sm.previous_state_id;
if (prev_state == SCI_PORT_RESETTING)
isci_port_hard_reset_complete(iport, SCI_SUCCESS);
else
dev_dbg(&ihost->pdev->dev, "%s: port%d !ready\n",
__func__, iport->physical_port_index);
/* Post and suspend the dummy remote node context for this port. */
sci_port_post_dummy_remote_node(iport);
/* Start the ready substate machine */
port_state_machine_change(iport,
SCI_PORT_SUB_WAITING);
}
static void sci_port_resetting_state_exit(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
sci_del_timer(&iport->timer);
}
static void sci_port_stopping_state_exit(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
sci_del_timer(&iport->timer);
sci_port_destroy_dummy_resources(iport);
}
static void sci_port_failed_state_enter(struct sci_base_state_machine *sm)
{
struct isci_port *iport = container_of(sm, typeof(*iport), sm);
isci_port_hard_reset_complete(iport, SCI_FAILURE_TIMEOUT);
}
void sci_port_set_hang_detection_timeout(struct isci_port *iport, u32 timeout)
{
int phy_index;
u32 phy_mask = iport->active_phy_mask;
if (timeout)
++iport->hang_detect_users;
else if (iport->hang_detect_users > 1)
--iport->hang_detect_users;
else
iport->hang_detect_users = 0;
if (timeout || (iport->hang_detect_users == 0)) {
for (phy_index = 0; phy_index < SCI_MAX_PHYS; phy_index++) {
if ((phy_mask >> phy_index) & 1) {
writel(timeout,
&iport->phy_table[phy_index]
->link_layer_registers
->link_layer_hang_detection_timeout);
}
}
}
}
/* --------------------------------------------------------------------------- */
static const struct sci_base_state sci_port_state_table[] = {
[SCI_PORT_STOPPED] = {
.enter_state = sci_port_stopped_state_enter,
.exit_state = sci_port_stopped_state_exit
},
[SCI_PORT_STOPPING] = {
.exit_state = sci_port_stopping_state_exit
},
[SCI_PORT_READY] = {
.enter_state = sci_port_ready_state_enter,
},
[SCI_PORT_SUB_WAITING] = {
.enter_state = sci_port_ready_substate_waiting_enter,
.exit_state = scic_sds_port_ready_substate_waiting_exit,
},
[SCI_PORT_SUB_OPERATIONAL] = {
.enter_state = sci_port_ready_substate_operational_enter,
.exit_state = sci_port_ready_substate_operational_exit
},
[SCI_PORT_SUB_CONFIGURING] = {
.enter_state = sci_port_ready_substate_configuring_enter
},
[SCI_PORT_RESETTING] = {
.exit_state = sci_port_resetting_state_exit
},
[SCI_PORT_FAILED] = {
.enter_state = sci_port_failed_state_enter,
}
};
void sci_port_construct(struct isci_port *iport, u8 index,
struct isci_host *ihost)
{
sci_init_sm(&iport->sm, sci_port_state_table, SCI_PORT_STOPPED);
iport->logical_port_index = SCIC_SDS_DUMMY_PORT;
iport->physical_port_index = index;
iport->active_phy_mask = 0;
iport->enabled_phy_mask = 0;
iport->last_active_phy = 0;
iport->ready_exit = false;
iport->owning_controller = ihost;
iport->started_request_count = 0;
iport->assigned_device_count = 0;
iport->hang_detect_users = 0;
iport->reserved_rni = SCU_DUMMY_INDEX;
iport->reserved_tag = SCI_CONTROLLER_INVALID_IO_TAG;
sci_init_timer(&iport->timer, port_timeout);
iport->port_task_scheduler_registers = NULL;
for (index = 0; index < SCI_MAX_PHYS; index++)
iport->phy_table[index] = NULL;
}
void sci_port_broadcast_change_received(struct isci_port *iport, struct isci_phy *iphy)
{
struct isci_host *ihost = iport->owning_controller;
/* notify the user. */
isci_port_bc_change_received(ihost, iport, iphy);
}
static void wait_port_reset(struct isci_host *ihost, struct isci_port *iport)
{
wait_event(ihost->eventq, !test_bit(IPORT_RESET_PENDING, &iport->state));
}
int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
struct isci_phy *iphy)
{
unsigned long flags;
enum sci_status status;
int ret = TMF_RESP_FUNC_COMPLETE;
dev_dbg(&ihost->pdev->dev, "%s: iport = %p\n",
__func__, iport);
spin_lock_irqsave(&ihost->scic_lock, flags);
set_bit(IPORT_RESET_PENDING, &iport->state);
#define ISCI_PORT_RESET_TIMEOUT SCIC_SDS_SIGNATURE_FIS_TIMEOUT
status = sci_port_hard_reset(iport, ISCI_PORT_RESET_TIMEOUT);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (status == SCI_SUCCESS) {
wait_port_reset(ihost, iport);
dev_dbg(&ihost->pdev->dev,
"%s: iport = %p; hard reset completion\n",
__func__, iport);
if (iport->hard_reset_status != SCI_SUCCESS) {
ret = TMF_RESP_FUNC_FAILED;
dev_err(&ihost->pdev->dev,
"%s: iport = %p; hard reset failed (0x%x)\n",
__func__, iport, iport->hard_reset_status);
}
} else {
clear_bit(IPORT_RESET_PENDING, &iport->state);
wake_up(&ihost->eventq);
ret = TMF_RESP_FUNC_FAILED;
dev_err(&ihost->pdev->dev,
"%s: iport = %p; sci_port_hard_reset call"
" failed 0x%x\n",
__func__, iport, status);
}
return ret;
}
int isci_ata_check_ready(struct domain_device *dev)
{
struct isci_port *iport = dev->port->lldd_port;
struct isci_host *ihost = dev_to_ihost(dev);
struct isci_remote_device *idev;
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&ihost->scic_lock, flags);
idev = isci_lookup_device(dev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (!idev)
goto out;
if (test_bit(IPORT_RESET_PENDING, &iport->state))
goto out;
rc = !!iport->active_phy_mask;
out:
isci_put_device(idev);
return rc;
}
void isci_port_deformed(struct asd_sas_phy *phy)
{
struct isci_host *ihost = phy->ha->lldd_ha;
struct isci_port *iport = phy->port->lldd_port;
unsigned long flags;
int i;
/* we got a port notification on a port that was subsequently
* torn down and libsas is just now catching up
*/
if (!iport)
return;
spin_lock_irqsave(&ihost->scic_lock, flags);
for (i = 0; i < SCI_MAX_PHYS; i++) {
if (iport->active_phy_mask & 1 << i)
break;
}
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (i >= SCI_MAX_PHYS)
dev_dbg(&ihost->pdev->dev, "%s: port: %ld\n",
__func__, (long) (iport - &ihost->ports[0]));
}
void isci_port_formed(struct asd_sas_phy *phy)
{
struct isci_host *ihost = phy->ha->lldd_ha;
struct isci_phy *iphy = to_iphy(phy);
struct asd_sas_port *port = phy->port;
struct isci_port *iport = NULL;
unsigned long flags;
int i;
/* initial ports are formed as the driver is still initializing,
* wait for that process to complete
*/
wait_for_start(ihost);
spin_lock_irqsave(&ihost->scic_lock, flags);
for (i = 0; i < SCI_MAX_PORTS; i++) {
iport = &ihost->ports[i];
if (iport->active_phy_mask & 1 << iphy->phy_index)
break;
}
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (i >= SCI_MAX_PORTS)
iport = NULL;
port->lldd_port = iport;
}
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