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OpenCloudOS-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)
static void isci_port_change_state(struct isci_port *iport, enum isci_status status)
{
unsigned long flags;
dev_dbg(&iport->isci_host->pdev->dev,
"%s: iport = %p, state = 0x%x\n",
__func__, iport, status);
/* XXX pointless lock */
spin_lock_irqsave(&iport->state_lock, flags);
iport->status = status;
spin_unlock_irqrestore(&iport->state_lock, flags);
}
/*
* This function will indicate which protocols are supported by this port.
* @sci_port: a handle corresponding to the SAS port for which to return the
* supported protocols.
* @protocols: This parameter specifies a pointer to a data structure
* which the core will copy the protocol values for the port from the
* transmit_identification register.
*/
static void
scic_sds_port_get_protocols(struct scic_sds_port *sci_port,
struct scic_phy_proto *protocols)
{
u8 index;
protocols->all = 0;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (sci_port->phy_table[index] != NULL) {
scic_sds_phy_get_protocols(sci_port->phy_table[index],
protocols);
}
}
}
/**
* This method requests a list (mask) of the phys contained in the supplied SAS
* port.
* @sci_port: a handle corresponding to the SAS port for which to return the
* phy mask.
*
* Return a bit mask indicating which phys are a part of this port. Each bit
* corresponds to a phy identifier (e.g. bit 0 = phy id 0).
*/
static u32 scic_sds_port_get_phys(struct scic_sds_port *sci_port)
{
u32 index;
u32 mask;
mask = 0;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (sci_port->phy_table[index] != NULL) {
mask |= (1 << index);
}
}
return mask;
}
/**
* scic_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.
*/
static enum sci_status scic_port_get_properties(struct scic_sds_port *port,
struct scic_port_properties *prop)
{
if ((port == NULL) ||
(port->logical_port_index == SCIC_SDS_DUMMY_PORT))
return SCI_FAILURE_INVALID_PORT;
prop->index = port->logical_port_index;
prop->phy_mask = scic_sds_port_get_phys(port);
scic_sds_port_get_sas_address(port, &prop->local.sas_address);
scic_sds_port_get_protocols(port, &prop->local.protocols);
scic_sds_port_get_attached_sas_address(port, &prop->remote.sas_address);
return SCI_SUCCESS;
}
static void isci_port_link_up(struct isci_host *isci_host,
struct scic_sds_port *port,
struct scic_sds_phy *phy)
{
unsigned long flags;
struct scic_port_properties properties;
struct isci_phy *isci_phy = sci_phy_to_iphy(phy);
struct isci_port *isci_port = sci_port_to_iport(port);
unsigned long success = true;
BUG_ON(isci_phy->isci_port != NULL);
isci_phy->isci_port = isci_port;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p\n",
__func__, isci_port);
spin_lock_irqsave(&isci_phy->sas_phy.frame_rcvd_lock, flags);
isci_port_change_state(isci_phy->isci_port, isci_starting);
scic_port_get_properties(port, &properties);
if (phy->protocol == SCIC_SDS_PHY_PROTOCOL_SATA) {
u64 attached_sas_address;
isci_phy->sas_phy.oob_mode = SATA_OOB_MODE;
isci_phy->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 scic_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(&isci_phy->sas_phy.attached_sas_addr,
&attached_sas_address, sizeof(attached_sas_address));
} else if (phy->protocol == SCIC_SDS_PHY_PROTOCOL_SAS) {
isci_phy->sas_phy.oob_mode = SAS_OOB_MODE;
isci_phy->sas_phy.frame_rcvd_size = sizeof(struct sas_identify_frame);
/* Copy the attached SAS address from the IAF */
memcpy(isci_phy->sas_phy.attached_sas_addr,
isci_phy->frame_rcvd.iaf.sas_addr, SAS_ADDR_SIZE);
} else {
dev_err(&isci_host->pdev->dev, "%s: unkown target\n", __func__);
success = false;
}
isci_phy->sas_phy.phy->negotiated_linkrate = sci_phy_linkrate(phy);
spin_unlock_irqrestore(&isci_phy->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(&isci_phy->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);
isci_remote_device_change_state(isci_device,
isci_stopping);
}
}
isci_port_change_state(isci_port, isci_stopping);
}
/* 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);
isci_phy->isci_port = NULL;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p - Done\n", __func__, isci_port);
}
/**
* isci_port_ready() - This function is called by the sci core when a link
* becomes ready.
* @isci_host: This parameter specifies the isci host object.
* @port: This parameter specifies the sci port with the active link.
*
*/
static void isci_port_ready(struct isci_host *isci_host, struct isci_port *isci_port)
{
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p\n", __func__, isci_port);
complete_all(&isci_port->start_complete);
isci_port_change_state(isci_port, isci_ready);
return;
}
/**
* isci_port_not_ready() - This function is called by the sci core when a link
* is not ready. All remote devices on this link will be removed if they are
* in the stopping state.
* @isci_host: This parameter specifies the isci host object.
* @port: This parameter specifies the sci port with the active link.
*
*/
static void isci_port_not_ready(struct isci_host *isci_host, struct isci_port *isci_port)
{
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p\n", __func__, isci_port);
}
static void isci_port_stop_complete(struct scic_sds_controller *scic,
struct scic_sds_port *sci_port,
enum sci_status completion_status)
{
dev_dbg(&scic_to_ihost(scic)->pdev->dev, "Port stop complete\n");
}
/**
* 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)
{
dev_dbg(&isci_port->isci_host->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;
complete_all(&isci_port->hard_reset_complete);
}
/* 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
* scic_sds_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 scic_sds_port_is_valid_phy_assignment(struct scic_sds_port *sci_port,
u32 phy_index)
{
/* Initialize to invalid value. */
u32 existing_phy_index = SCI_MAX_PHYS;
u32 index;
if ((sci_port->physical_port_index == 1) && (phy_index != 1)) {
return false;
}
if (sci_port->physical_port_index == 3 && phy_index != 3) {
return false;
}
if (
(sci_port->physical_port_index == 2)
&& ((phy_index == 0) || (phy_index == 1))
) {
return false;
}
for (index = 0; index < SCI_MAX_PHYS; index++) {
if ((sci_port->phy_table[index] != NULL)
&& (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)
&& (sci_port->owning_controller->user_parameters.sds1.phys[
phy_index].max_speed_generation !=
sci_port->owning_controller->user_parameters.sds1.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 scic_sds_port_is_phy_mask_valid(
struct scic_sds_port *sci_port,
u32 phy_mask)
{
if (sci_port->physical_port_index == 0) {
if (((phy_mask & 0x0F) == 0x0F)
|| ((phy_mask & 0x03) == 0x03)
|| ((phy_mask & 0x01) == 0x01)
|| (phy_mask == 0))
return true;
} else if (sci_port->physical_port_index == 1) {
if (((phy_mask & 0x02) == 0x02)
|| (phy_mask == 0))
return true;
} else if (sci_port->physical_port_index == 2) {
if (((phy_mask & 0x0C) == 0x0C)
|| ((phy_mask & 0x04) == 0x04)
|| (phy_mask == 0))
return true;
} else if (sci_port->physical_port_index == 3) {
if (((phy_mask & 0x08) == 0x08)
|| (phy_mask == 0))
return true;
}
return false;
}
/**
*
* @sci_port: This parameter specifies the port from which to return a
* connected phy.
*
* 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 scic_sds_phy
* object that is active in the port.
*/
static struct scic_sds_phy *scic_sds_port_get_a_connected_phy(
struct scic_sds_port *sci_port
) {
u32 index;
struct scic_sds_phy *phy;
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. */
phy = sci_port->phy_table[index];
if (
(phy != NULL)
&& scic_sds_port_active_phy(sci_port, phy)
) {
return phy;
}
}
return NULL;
}
/**
* scic_sds_port_set_phy() -
* @out]: port The port object to which the phy assignement is being made.
* @out]: phy The phy which is being assigned to the port.
*
* This method attempts to make the assignment of the phy to the port. If
* successful the phy is assigned to the ports phy table. bool true if the phy
* assignment can be made. false if the phy assignement can not be made. This
* is a functional test that only fails if the phy is currently assigned to a
* different port.
*/
static enum sci_status scic_sds_port_set_phy(
struct scic_sds_port *port,
struct scic_sds_phy *phy)
{
/*
* 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 (
(port->phy_table[phy->phy_index] == NULL)
&& (phy_get_non_dummy_port(phy) == NULL)
&& scic_sds_port_is_valid_phy_assignment(port, phy->phy_index)
) {
/*
* Phy is being added in the stopped state so we are in MPC mode
* make logical port index = physical port index */
port->logical_port_index = port->physical_port_index;
port->phy_table[phy->phy_index] = phy;
scic_sds_phy_set_port(phy, port);
return SCI_SUCCESS;
}
return SCI_FAILURE;
}
/**
* scic_sds_port_clear_phy() -
* @out]: port The port from which the phy is being cleared.
* @out]: phy The phy being cleared from the port.
*
* This method will clear the phy assigned to this port. This method fails if
* this phy is not currently assinged to this port. bool true if the phy is
* removed from the port. false if this phy is not assined to this port.
*/
static enum sci_status scic_sds_port_clear_phy(
struct scic_sds_port *port,
struct scic_sds_phy *phy)
{
/* Make sure that this phy is part of this port */
if (port->phy_table[phy->phy_index] == phy &&
phy_get_non_dummy_port(phy) == port) {
struct scic_sds_controller *scic = port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
/* Yep it is assigned to this port so remove it */
scic_sds_phy_set_port(phy, &ihost->ports[SCI_MAX_PORTS].sci);
port->phy_table[phy->phy_index] = NULL;
return SCI_SUCCESS;
}
return SCI_FAILURE;
}
/**
* This method requests the SAS address for the supplied SAS port from the SCI
* implementation.
* @sci_port: a handle corresponding to the SAS port for which to return the
* SAS address.
* @sas_address: This parameter specifies a pointer to a SAS address structure
* into which the core will copy the SAS address for the port.
*
*/
void scic_sds_port_get_sas_address(
struct scic_sds_port *sci_port,
struct sci_sas_address *sas_address)
{
u32 index;
sas_address->high = 0;
sas_address->low = 0;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (sci_port->phy_table[index] != NULL) {
scic_sds_phy_get_sas_address(sci_port->phy_table[index], sas_address);
}
}
}
/*
* This function requests the SAS address for the device directly attached to
* this SAS port.
* @sci_port: a handle corresponding to the SAS port for which to return the
* SAS address.
* @sas_address: This parameter specifies a pointer to a SAS address structure
* into which the core will copy the SAS address for the device directly
* attached to the port.
*
*/
void scic_sds_port_get_attached_sas_address(
struct scic_sds_port *sci_port,
struct sci_sas_address *sas_address)
{
struct scic_sds_phy *sci_phy;
/*
* Ensure that the phy is both part of the port and currently
* connected to the remote end-point.
*/
sci_phy = scic_sds_port_get_a_connected_phy(sci_port);
if (sci_phy) {
if (sci_phy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA) {
scic_sds_phy_get_attached_sas_address(sci_phy,
sas_address);
} else {
scic_sds_phy_get_sas_address(sci_phy, sas_address);
sas_address->low += sci_phy->phy_index;
}
} else {
sas_address->high = 0;
sas_address->low = 0;
}
}
/**
* scic_sds_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 scic_sds_port_construct_dummy_rnc(struct scic_sds_port *sci_port, u16 rni)
{
union scu_remote_node_context *rnc;
rnc = &sci_port->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 = sci_port->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;
}
/**
* scic_sds_port_construct_dummy_task() - create dummy task for si workaround
* @sci_port The logical port on which we need to create the
* remote node context.
* context.
* @tci The remote node index for this remote node context.
*
* This routine will 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 scic_sds_port_construct_dummy_task(struct scic_sds_port *sci_port, u16 tci)
{
struct scu_task_context *task_context;
task_context = scic_sds_controller_get_task_context_buffer(sci_port->owning_controller, tci);
memset(task_context, 0, sizeof(struct scu_task_context));
task_context->abort = 0;
task_context->priority = 0;
task_context->initiator_request = 1;
task_context->connection_rate = 1;
task_context->protocol_engine_index = 0;
task_context->logical_port_index = sci_port->physical_port_index;
task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
task_context->task_index = scic_sds_io_tag_get_index(tci);
task_context->valid = SCU_TASK_CONTEXT_VALID;
task_context->context_type = SCU_TASK_CONTEXT_TYPE;
task_context->remote_node_index = sci_port->reserved_rni;
task_context->command_code = 0;
task_context->link_layer_control = 0;
task_context->do_not_dma_ssp_good_response = 1;
task_context->strict_ordering = 0;
task_context->control_frame = 0;
task_context->timeout_enable = 0;
task_context->block_guard_enable = 0;
task_context->address_modifier = 0;
task_context->task_phase = 0x01;
}
static void scic_sds_port_destroy_dummy_resources(struct scic_sds_port *sci_port)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
if (sci_port->reserved_tci != SCU_DUMMY_INDEX)
scic_controller_free_io_tag(scic, sci_port->reserved_tci);
if (sci_port->reserved_rni != SCU_DUMMY_INDEX)
scic_sds_remote_node_table_release_remote_node_index(&scic->available_remote_nodes,
1, sci_port->reserved_rni);
sci_port->reserved_rni = SCU_DUMMY_INDEX;
sci_port->reserved_tci = SCU_DUMMY_INDEX;
}
/**
* This method performs initialization of the supplied port. Initialization
* includes: - state machine initialization - member variable initialization
* - configuring the phy_mask
* @sci_port:
* @transport_layer_registers:
* @port_task_scheduler_registers:
* @port_configuration_regsiter:
*
* enum sci_status SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION This value is returned
* if the phy being added to the port
*/
enum sci_status scic_sds_port_initialize(
struct scic_sds_port *sci_port,
void __iomem *port_task_scheduler_registers,
void __iomem *port_configuration_regsiter,
void __iomem *viit_registers)
{
sci_port->port_task_scheduler_registers = port_task_scheduler_registers;
sci_port->port_pe_configuration_register = port_configuration_regsiter;
sci_port->viit_registers = viit_registers;
return SCI_SUCCESS;
}
/**
* This method assigns the direct attached device ID for this port.
*
* @param[in] sci_port The port for which the direct attached device id is to
* be assigned.
* @param[in] device_id The direct attached device ID to assign to the port.
* This will be the RNi for the device
*/
void scic_sds_port_setup_transports(
struct scic_sds_port *sci_port,
u32 device_id)
{
u8 index;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (sci_port->active_phy_mask & (1 << index))
scic_sds_phy_setup_transport(sci_port->phy_table[index], device_id);
}
}
/**
*
* @sci_port: This is the port on which the phy should be enabled.
* @sci_phy: This is the specific phy which to enable.
* @do_notify_user: This parameter specifies whether to inform the user (via
* scic_cb_port_link_up()) as to the fact that a new phy as become ready.
*
* This function will activate the phy in the port.
* Activation includes: - adding
* the phy to the port - enabling the Protocol Engine in the silicon. -
* notifying the user that the link is up. none
*/
static void scic_sds_port_activate_phy(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy,
bool do_notify_user)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
if (sci_phy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA)
scic_sds_phy_resume(sci_phy);
sci_port->active_phy_mask |= 1 << sci_phy->phy_index;
scic_sds_controller_clear_invalid_phy(scic, sci_phy);
if (do_notify_user == true)
isci_port_link_up(ihost, sci_port, sci_phy);
}
void scic_sds_port_deactivate_phy(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy,
bool do_notify_user)
{
struct scic_sds_controller *scic = scic_sds_port_get_controller(sci_port);
struct isci_port *iport = sci_port_to_iport(sci_port);
struct isci_host *ihost = scic_to_ihost(scic);
struct isci_phy *iphy = sci_phy_to_iphy(sci_phy);
sci_port->active_phy_mask &= ~(1 << sci_phy->phy_index);
sci_phy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN;
/* Re-assign the phy back to the LP as if it were a narrow port */
writel(sci_phy->phy_index,
&sci_port->port_pe_configuration_register[sci_phy->phy_index]);
if (do_notify_user == true)
isci_port_link_down(ihost, iphy, iport);
}
/**
*
* @sci_port: This is the port on which the phy should be disabled.
* @sci_phy: This is the specific phy which to disabled.
*
* This function will disable the phy and report that the phy is not valid for
* this port object. None
*/
static void scic_sds_port_invalid_link_up(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
struct scic_sds_controller *scic = sci_port->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 ((scic->invalid_phy_mask & (1 << sci_phy->phy_index)) == 0) {
scic_sds_controller_set_invalid_phy(scic, sci_phy);
dev_warn(&scic_to_ihost(scic)->pdev->dev, "Invalid link up!\n");
}
}
static bool is_port_ready_state(enum scic_sds_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 scic_sds_port *sci_port,
enum scic_sds_port_states state)
{
struct sci_base_state_machine *sm = &sci_port->sm;
enum scic_sds_port_states old_state = sm->current_state_id;
if (is_port_ready_state(old_state) && !is_port_ready_state(state))
sci_port->ready_exit = true;
sci_change_state(sm, state);
sci_port->ready_exit = false;
}
/**
* scic_sds_port_general_link_up_handler - phy can be assigned to port?
* @sci_port: scic_sds_port object for which has a phy that has gone link up.
* @sci_phy: This is the struct scic_sds_phy object that has gone link up.
* @do_notify_user: This parameter specifies whether to inform the user (via
* scic_cb_port_link_up()) as to the fact that a new phy as become ready.
*
* 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. none
*/
static void scic_sds_port_general_link_up_handler(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy,
bool do_notify_user)
{
struct sci_sas_address port_sas_address;
struct sci_sas_address phy_sas_address;
scic_sds_port_get_attached_sas_address(sci_port, &port_sas_address);
scic_sds_phy_get_attached_sas_address(sci_phy, &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) ||
sci_port->active_phy_mask == 0) {
struct sci_base_state_machine *sm = &sci_port->sm;
scic_sds_port_activate_phy(sci_port, sci_phy, do_notify_user);
if (sm->current_state_id == SCI_PORT_RESETTING)
port_state_machine_change(sci_port, SCI_PORT_READY);
} else
scic_sds_port_invalid_link_up(sci_port, sci_phy);
}
/**
* 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 scic_sds_port_is_wide(struct scic_sds_port *sci_port)
{
u32 index;
u32 phy_count = 0;
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (sci_port->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 scic_sds_port_link_detected(
struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
if ((sci_port->logical_port_index != SCIC_SDS_DUMMY_PORT) &&
(sci_phy->protocol == SCIC_SDS_PHY_PROTOCOL_SATA) &&
scic_sds_port_is_wide(sci_port)) {
scic_sds_port_invalid_link_up(sci_port, sci_phy);
return false;
}
return true;
}
static void port_timeout(unsigned long data)
{
struct sci_timer *tmr = (struct sci_timer *)data;
struct scic_sds_port *sci_port = container_of(tmr, typeof(*sci_port), timer);
struct isci_host *ihost = scic_to_ihost(sci_port->owning_controller);
unsigned long flags;
u32 current_state;
spin_lock_irqsave(&ihost->scic_lock, flags);
if (tmr->cancel)
goto done;
current_state = sci_port->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(sci_port, 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(sci_port),
"%s: SCIC Port 0x%p failed to stop before tiemout.\n",
__func__,
sci_port);
} else if (current_state == SCI_PORT_STOPPING) {
/* if the port is still stopping then the stop has not completed */
isci_port_stop_complete(sci_port->owning_controller,
sci_port,
SCI_FAILURE_TIMEOUT);
} 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(sci_port),
"%s: SCIC Port 0x%p is processing a timeout operation "
"in state %d.\n", __func__, sci_port, current_state);
}
done:
spin_unlock_irqrestore(&ihost->scic_lock, flags);
}
/* --------------------------------------------------------------------------- */
/**
* This function updates the hardwares VIIT entry for this port.
*
*
*/
static void scic_sds_port_update_viit_entry(struct scic_sds_port *sci_port)
{
struct sci_sas_address sas_address;
scic_sds_port_get_sas_address(sci_port, &sas_address);
writel(sas_address.high,
&sci_port->viit_registers->initiator_sas_address_hi);
writel(sas_address.low,
&sci_port->viit_registers->initiator_sas_address_lo);
/* This value get cleared just in case its not already cleared */
writel(0, &sci_port->viit_registers->reserved);
/* We are required to update the status register last */
writel(SCU_VIIT_ENTRY_ID_VIIT |
SCU_VIIT_IPPT_INITIATOR |
((1 << sci_port->physical_port_index) << SCU_VIIT_ENTRY_LPVIE_SHIFT) |
SCU_VIIT_STATUS_ALL_VALID,
&sci_port->viit_registers->status);
}
/**
* This method returns the maximum allowed speed for data transfers on this
* port. This maximum allowed speed evaluates to the maximum speed of the
* slowest phy in the port.
* @sci_port: This parameter specifies the port for which to retrieve the
* maximum allowed speed.
*
* This method returns the maximum negotiated speed of the slowest phy in the
* port.
*/
enum sas_linkrate scic_sds_port_get_max_allowed_speed(
struct scic_sds_port *sci_port)
{
u16 index;
enum sas_linkrate max_allowed_speed = SAS_LINK_RATE_6_0_GBPS;
struct scic_sds_phy *phy = NULL;
/*
* 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++) {
phy = sci_port->phy_table[index];
if (
(phy != NULL)
&& (scic_sds_port_active_phy(sci_port, phy) == true)
&& (phy->max_negotiated_speed < max_allowed_speed)
)
max_allowed_speed = phy->max_negotiated_speed;
}
return max_allowed_speed;
}
static void scic_port_enable_broadcast_change_notification(struct scic_sds_port *port)
{
struct scic_sds_phy *phy;
u32 register_value;
u8 index;
/* Loop through all of the phys to enable BCN. */
for (index = 0; index < SCI_MAX_PHYS; index++) {
phy = port->phy_table[index];
if (phy != NULL) {
register_value =
readl(&phy->link_layer_registers->link_layer_control);
/* clear the bit by writing 1. */
writel(register_value,
&phy->link_layer_registers->link_layer_control);
}
}
}
/**
*
* @sci_port: This is the struct scic_sds_port object to suspend.
*
* This method will susped the port task scheduler for this port object. none
*/
static void
scic_sds_port_suspend_port_task_scheduler(struct scic_sds_port *port)
{
u32 pts_control_value;
pts_control_value = readl(&port->port_task_scheduler_registers->control);
pts_control_value |= SCU_PTSxCR_GEN_BIT(SUSPEND);
writel(pts_control_value, &port->port_task_scheduler_registers->control);
}
/**
* scic_sds_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 scic_sds_port_post_dummy_request(struct scic_sds_port *sci_port)
{
u32 command;
struct scu_task_context *task_context;
struct scic_sds_controller *scic = sci_port->owning_controller;
u16 tci = sci_port->reserved_tci;
task_context = scic_sds_controller_get_task_context_buffer(scic, tci);
task_context->abort = 0;
command = SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
sci_port->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
tci;
scic_sds_controller_post_request(scic, 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 scic_sds_port_abort_dummy_request(struct scic_sds_port *sci_port)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
u16 tci = sci_port->reserved_tci;
struct scu_task_context *tc;
u32 command;
tc = scic_sds_controller_get_task_context_buffer(scic, tci);
tc->abort = 1;
command = SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT |
sci_port->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT |
tci;
scic_sds_controller_post_request(scic, command);
}
/**
*
* @sci_port: This is the struct scic_sds_port object to resume.
*
* This method will resume the port task scheduler for this port object. none
*/
static void
scic_sds_port_resume_port_task_scheduler(struct scic_sds_port *port)
{
u32 pts_control_value;
pts_control_value = readl(&port->port_task_scheduler_registers->control);
pts_control_value &= ~SCU_PTSxCR_GEN_BIT(SUSPEND);
writel(pts_control_value, &port->port_task_scheduler_registers->control);
}
static void scic_sds_port_ready_substate_waiting_enter(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
scic_sds_port_suspend_port_task_scheduler(sci_port);
sci_port->not_ready_reason = SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS;
if (sci_port->active_phy_mask != 0) {
/* At least one of the phys on the port is ready */
port_state_machine_change(sci_port,
SCI_PORT_SUB_OPERATIONAL);
}
}
static void scic_sds_port_ready_substate_operational_enter(struct sci_base_state_machine *sm)
{
u32 index;
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
struct scic_sds_controller *scic = sci_port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
struct isci_port *iport = sci_port_to_iport(sci_port);
isci_port_ready(ihost, iport);
for (index = 0; index < SCI_MAX_PHYS; index++) {
if (sci_port->phy_table[index]) {
writel(sci_port->physical_port_index,
&sci_port->port_pe_configuration_register[
sci_port->phy_table[index]->phy_index]);
}
}
scic_sds_port_update_viit_entry(sci_port);
scic_sds_port_resume_port_task_scheduler(sci_port);
/*
* Post the dummy task for the port so the hardware can schedule
* io correctly
*/
scic_sds_port_post_dummy_request(sci_port);
}
static void scic_sds_port_invalidate_dummy_remote_node(struct scic_sds_port *sci_port)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
u8 phys_index = sci_port->physical_port_index;
union scu_remote_node_context *rnc;
u16 rni = sci_port->reserved_rni;
u32 command;
rnc = &scic->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(&scic->smu_registers->interrupt_status); /* flush */
udelay(10);
command = SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE |
phys_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT | rni;
scic_sds_controller_post_request(scic, command);
}
/**
*
* @object: This is the object which is cast to a struct scic_sds_port object.
*
* This method will perform the actions required by the struct scic_sds_port on
* exiting the SCI_PORT_SUB_OPERATIONAL. This function reports
* the port not ready and suspends the port task scheduler. none
*/
static void scic_sds_port_ready_substate_operational_exit(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
struct scic_sds_controller *scic = sci_port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
struct isci_port *iport = sci_port_to_iport(sci_port);
/*
* 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.
*/
scic_sds_port_abort_dummy_request(sci_port);
isci_port_not_ready(ihost, iport);
if (sci_port->ready_exit)
scic_sds_port_invalidate_dummy_remote_node(sci_port);
}
static void scic_sds_port_ready_substate_configuring_enter(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
struct scic_sds_controller *scic = sci_port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
struct isci_port *iport = sci_port_to_iport(sci_port);
if (sci_port->active_phy_mask == 0) {
isci_port_not_ready(ihost, iport);
port_state_machine_change(sci_port,
SCI_PORT_SUB_WAITING);
} else if (sci_port->started_request_count == 0)
port_state_machine_change(sci_port,
SCI_PORT_SUB_OPERATIONAL);
}
static void scic_sds_port_ready_substate_configuring_exit(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
scic_sds_port_suspend_port_task_scheduler(sci_port);
if (sci_port->ready_exit)
scic_sds_port_invalidate_dummy_remote_node(sci_port);
}
enum sci_status scic_sds_port_start(struct scic_sds_port *sci_port)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
enum sci_status status = SCI_SUCCESS;
enum scic_sds_port_states state;
u32 phy_mask;
state = sci_port->sm.current_state_id;
if (state != SCI_PORT_STOPPED) {
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
if (sci_port->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 (sci_port->reserved_rni == SCU_DUMMY_INDEX) {
u16 rni = scic_sds_remote_node_table_allocate_remote_node(
&scic->available_remote_nodes, 1);
if (rni != SCU_DUMMY_INDEX)
scic_sds_port_construct_dummy_rnc(sci_port, rni);
else
status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
sci_port->reserved_rni = rni;
}
if (sci_port->reserved_tci == SCU_DUMMY_INDEX) {
/* Allocate a TCI and remove the sequence nibble */
u16 tci = scic_controller_allocate_io_tag(scic);
if (tci != SCU_DUMMY_INDEX)
scic_sds_port_construct_dummy_task(sci_port, tci);
else
status = SCI_FAILURE_INSUFFICIENT_RESOURCES;
sci_port->reserved_tci = tci;
}
if (status == SCI_SUCCESS) {
phy_mask = scic_sds_port_get_phys(sci_port);
/*
* 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 (scic_sds_port_is_phy_mask_valid(sci_port, phy_mask) == true) {
port_state_machine_change(sci_port,
SCI_PORT_READY);
return SCI_SUCCESS;
}
status = SCI_FAILURE;
}
if (status != SCI_SUCCESS)
scic_sds_port_destroy_dummy_resources(sci_port);
return status;
}
enum sci_status scic_sds_port_stop(struct scic_sds_port *sci_port)
{
enum scic_sds_port_states state;
state = sci_port->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(sci_port,
SCI_PORT_STOPPING);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
static enum sci_status scic_port_hard_reset(struct scic_sds_port *sci_port, u32 timeout)
{
enum sci_status status = SCI_FAILURE_INVALID_PHY;
struct scic_sds_phy *selected_phy = NULL;
enum scic_sds_port_states state;
u32 phy_index;
state = sci_port->sm.current_state_id;
if (state != SCI_PORT_SUB_OPERATIONAL) {
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, 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 && !selected_phy; phy_index++) {
selected_phy = sci_port->phy_table[phy_index];
if (selected_phy &&
!scic_sds_port_active_phy(sci_port, selected_phy)) {
/*
* We found a phy but it is not ready select
* different phy
*/
selected_phy = NULL;
}
}
/* If we have a phy then go ahead and start the reset procedure */
if (!selected_phy)
return status;
status = scic_sds_phy_reset(selected_phy);
if (status != SCI_SUCCESS)
return status;
sci_mod_timer(&sci_port->timer, timeout);
sci_port->not_ready_reason = SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED;
port_state_machine_change(sci_port,
SCI_PORT_RESETTING);
return SCI_SUCCESS;
}
/**
* scic_sds_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 scic_sds_port_add_phy(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
enum sci_status status;
enum scic_sds_port_states state;
state = sci_port->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 */
scic_sds_port_get_sas_address(sci_port, &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
*/
scic_sds_phy_get_sas_address(sci_phy, &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 scic_sds_port_set_phy(sci_port, sci_phy);
}
case SCI_PORT_SUB_WAITING:
case SCI_PORT_SUB_OPERATIONAL:
status = scic_sds_port_set_phy(sci_port, sci_phy);
if (status != SCI_SUCCESS)
return status;
scic_sds_port_general_link_up_handler(sci_port, sci_phy, true);
sci_port->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;
port_state_machine_change(sci_port, SCI_PORT_SUB_CONFIGURING);
return status;
case SCI_PORT_SUB_CONFIGURING:
status = scic_sds_port_set_phy(sci_port, sci_phy);
if (status != SCI_SUCCESS)
return status;
scic_sds_port_general_link_up_handler(sci_port, sci_phy, true);
/* Re-enter the configuring state since this may be the last phy in
* the port.
*/
port_state_machine_change(sci_port,
SCI_PORT_SUB_CONFIGURING);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
/**
* scic_sds_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 scic_sds_port_remove_phy(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
enum sci_status status;
enum scic_sds_port_states state;
state = sci_port->sm.current_state_id;
switch (state) {
case SCI_PORT_STOPPED:
return scic_sds_port_clear_phy(sci_port, sci_phy);
case SCI_PORT_SUB_OPERATIONAL:
status = scic_sds_port_clear_phy(sci_port, sci_phy);
if (status != SCI_SUCCESS)
return status;
scic_sds_port_deactivate_phy(sci_port, sci_phy, true);
sci_port->not_ready_reason = SCIC_PORT_NOT_READY_RECONFIGURING;
port_state_machine_change(sci_port,
SCI_PORT_SUB_CONFIGURING);
return SCI_SUCCESS;
case SCI_PORT_SUB_CONFIGURING:
status = scic_sds_port_clear_phy(sci_port, sci_phy);
if (status != SCI_SUCCESS)
return status;
scic_sds_port_deactivate_phy(sci_port, sci_phy, true);
/* Re-enter the configuring state since this may be the last phy in
* the port
*/
port_state_machine_change(sci_port,
SCI_PORT_SUB_CONFIGURING);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status scic_sds_port_link_up(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
enum scic_sds_port_states state;
state = sci_port->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
*/
scic_sds_port_activate_phy(sci_port, sci_phy, true);
port_state_machine_change(sci_port,
SCI_PORT_SUB_OPERATIONAL);
return SCI_SUCCESS;
case SCI_PORT_SUB_OPERATIONAL:
scic_sds_port_general_link_up_handler(sci_port, sci_phy, true);
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.
*/
scic_sds_port_general_link_up_handler(sci_port, sci_phy, false);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status scic_sds_port_link_down(struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
enum scic_sds_port_states state;
state = sci_port->sm.current_state_id;
switch (state) {
case SCI_PORT_SUB_OPERATIONAL:
scic_sds_port_deactivate_phy(sci_port, sci_phy, 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 (sci_port->active_phy_mask == 0)
port_state_machine_change(sci_port,
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. */
scic_sds_port_deactivate_phy(sci_port, sci_phy, false);
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status scic_sds_port_start_io(struct scic_sds_port *sci_port,
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req)
{
enum scic_sds_port_states state;
state = sci_port->sm.current_state_id;
switch (state) {
case SCI_PORT_SUB_WAITING:
return SCI_FAILURE_INVALID_STATE;
case SCI_PORT_SUB_OPERATIONAL:
sci_port->started_request_count++;
return SCI_SUCCESS;
default:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status scic_sds_port_complete_io(struct scic_sds_port *sci_port,
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req)
{
enum scic_sds_port_states state;
state = sci_port->sm.current_state_id;
switch (state) {
case SCI_PORT_STOPPED:
dev_warn(sciport_to_dev(sci_port),
"%s: in wrong state: %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_PORT_STOPPING:
scic_sds_port_decrement_request_count(sci_port);
if (sci_port->started_request_count == 0)
port_state_machine_change(sci_port,
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:
scic_sds_port_decrement_request_count(sci_port);
break;
case SCI_PORT_SUB_CONFIGURING:
scic_sds_port_decrement_request_count(sci_port);
if (sci_port->started_request_count == 0) {
port_state_machine_change(sci_port,
SCI_PORT_SUB_OPERATIONAL);
}
break;
}
return SCI_SUCCESS;
}
/**
*
* @sci_port: This is the port object which to suspend.
*
* This method will enable the SCU Port Task Scheduler for this port object but
* will leave the port task scheduler in a suspended state. none
*/
static void
scic_sds_port_enable_port_task_scheduler(struct scic_sds_port *port)
{
u32 pts_control_value;
pts_control_value = readl(&port->port_task_scheduler_registers->control);
pts_control_value |= SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND);
writel(pts_control_value, &port->port_task_scheduler_registers->control);
}
/**
*
* @sci_port: This is the port object which to resume.
*
* This method will disable the SCU port task scheduler for this port object.
* none
*/
static void
scic_sds_port_disable_port_task_scheduler(struct scic_sds_port *port)
{
u32 pts_control_value;
pts_control_value = readl(&port->port_task_scheduler_registers->control);
pts_control_value &=
~(SCU_PTSxCR_GEN_BIT(ENABLE) | SCU_PTSxCR_GEN_BIT(SUSPEND));
writel(pts_control_value, &port->port_task_scheduler_registers->control);
}
static void scic_sds_port_post_dummy_remote_node(struct scic_sds_port *sci_port)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
u8 phys_index = sci_port->physical_port_index;
union scu_remote_node_context *rnc;
u16 rni = sci_port->reserved_rni;
u32 command;
rnc = &scic->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;
scic_sds_controller_post_request(scic, command);
/* ensure hardware has seen the post rnc command and give it
* ample time to act before sending the suspend
*/
readl(&scic->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;
scic_sds_controller_post_request(scic, command);
}
static void scic_sds_port_stopped_state_enter(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
if (sci_port->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. */
scic_sds_port_disable_port_task_scheduler(sci_port);
}
}
static void scic_sds_port_stopped_state_exit(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
/* Enable and suspend the port task scheduler */
scic_sds_port_enable_port_task_scheduler(sci_port);
}
static void scic_sds_port_ready_state_enter(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
struct scic_sds_controller *scic = sci_port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
struct isci_port *iport = sci_port_to_iport(sci_port);
u32 prev_state;
prev_state = sci_port->sm.previous_state_id;
if (prev_state == SCI_PORT_RESETTING)
isci_port_hard_reset_complete(iport, SCI_SUCCESS);
else
isci_port_not_ready(ihost, iport);
/* Post and suspend the dummy remote node context for this port. */
scic_sds_port_post_dummy_remote_node(sci_port);
/* Start the ready substate machine */
port_state_machine_change(sci_port,
SCI_PORT_SUB_WAITING);
}
static void scic_sds_port_resetting_state_exit(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
sci_del_timer(&sci_port->timer);
}
static void scic_sds_port_stopping_state_exit(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
sci_del_timer(&sci_port->timer);
scic_sds_port_destroy_dummy_resources(sci_port);
}
static void scic_sds_port_failed_state_enter(struct sci_base_state_machine *sm)
{
struct scic_sds_port *sci_port = container_of(sm, typeof(*sci_port), sm);
struct isci_port *iport = sci_port_to_iport(sci_port);
isci_port_hard_reset_complete(iport, SCI_FAILURE_TIMEOUT);
}
/* --------------------------------------------------------------------------- */
static const struct sci_base_state scic_sds_port_state_table[] = {
[SCI_PORT_STOPPED] = {
.enter_state = scic_sds_port_stopped_state_enter,
.exit_state = scic_sds_port_stopped_state_exit
},
[SCI_PORT_STOPPING] = {
.exit_state = scic_sds_port_stopping_state_exit
},
[SCI_PORT_READY] = {
.enter_state = scic_sds_port_ready_state_enter,
},
[SCI_PORT_SUB_WAITING] = {
.enter_state = scic_sds_port_ready_substate_waiting_enter,
},
[SCI_PORT_SUB_OPERATIONAL] = {
.enter_state = scic_sds_port_ready_substate_operational_enter,
.exit_state = scic_sds_port_ready_substate_operational_exit
},
[SCI_PORT_SUB_CONFIGURING] = {
.enter_state = scic_sds_port_ready_substate_configuring_enter,
.exit_state = scic_sds_port_ready_substate_configuring_exit
},
[SCI_PORT_RESETTING] = {
.exit_state = scic_sds_port_resetting_state_exit
},
[SCI_PORT_FAILED] = {
.enter_state = scic_sds_port_failed_state_enter,
}
};
void scic_sds_port_construct(struct scic_sds_port *sci_port, u8 index,
struct scic_sds_controller *scic)
{
sci_init_sm(&sci_port->sm, scic_sds_port_state_table, SCI_PORT_STOPPED);
sci_port->logical_port_index = SCIC_SDS_DUMMY_PORT;
sci_port->physical_port_index = index;
sci_port->active_phy_mask = 0;
sci_port->ready_exit = false;
sci_port->owning_controller = scic;
sci_port->started_request_count = 0;
sci_port->assigned_device_count = 0;
sci_port->reserved_rni = SCU_DUMMY_INDEX;
sci_port->reserved_tci = SCU_DUMMY_INDEX;
sci_init_timer(&sci_port->timer, port_timeout);
sci_port->port_task_scheduler_registers = NULL;
for (index = 0; index < SCI_MAX_PHYS; index++)
sci_port->phy_table[index] = NULL;
}
void isci_port_init(struct isci_port *iport, struct isci_host *ihost, int index)
{
INIT_LIST_HEAD(&iport->remote_dev_list);
INIT_LIST_HEAD(&iport->domain_dev_list);
spin_lock_init(&iport->state_lock);
init_completion(&iport->start_complete);
iport->isci_host = ihost;
isci_port_change_state(iport, isci_freed);
}
/**
* isci_port_get_state() - This function gets the status of the port object.
* @isci_port: This parameter points to the isci_port object
*
* status of the object as a isci_status enum.
*/
enum isci_status isci_port_get_state(
struct isci_port *isci_port)
{
return isci_port->status;
}
static void isci_port_bc_change_received(struct isci_host *ihost,
struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
struct isci_phy *iphy = sci_phy_to_iphy(sci_phy);
dev_dbg(&ihost->pdev->dev, "%s: iphy = %p, sas_phy = %p\n",
__func__, iphy, &iphy->sas_phy);
ihost->sas_ha.notify_port_event(&iphy->sas_phy, PORTE_BROADCAST_RCVD);
scic_port_enable_broadcast_change_notification(sci_port);
}
void scic_sds_port_broadcast_change_received(
struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy)
{
struct scic_sds_controller *scic = sci_port->owning_controller;
struct isci_host *ihost = scic_to_ihost(scic);
/* notify the user. */
isci_port_bc_change_received(ihost, sci_port, sci_phy);
}
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);
init_completion(&iport->hard_reset_complete);
spin_lock_irqsave(&ihost->scic_lock, flags);
#define ISCI_PORT_RESET_TIMEOUT SCIC_SDS_SIGNATURE_FIS_TIMEOUT
status = scic_port_hard_reset(&iport->sci, ISCI_PORT_RESET_TIMEOUT);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (status == SCI_SUCCESS) {
wait_for_completion(&iport->hard_reset_complete);
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;
} else {
ret = TMF_RESP_FUNC_FAILED;
dev_err(&ihost->pdev->dev,
"%s: iport = %p; scic_port_hard_reset call"
" failed 0x%x\n",
__func__, iport, status);
}
/* If the hard reset for the port has failed, consider this
* the same as link failures on all phys in the port.
*/
if (ret != TMF_RESP_FUNC_COMPLETE) {
dev_err(&ihost->pdev->dev,
"%s: iport = %p; hard reset failed "
"(0x%x) - sending link down to libsas for phy %p\n",
__func__, iport, iport->hard_reset_status, iphy);
isci_port_link_down(ihost, iphy, iport);
}
return ret;
}
/**
* isci_port_deformed() - This function is called by libsas when a port becomes
* inactive.
* @phy: This parameter specifies the libsas phy with the inactive port.
*
*/
void isci_port_deformed(struct asd_sas_phy *phy)
{
pr_debug("%s: sas_phy = %p\n", __func__, phy);
}
/**
* isci_port_formed() - This function is called by libsas when a port becomes
* active.
* @phy: This parameter specifies the libsas phy with the active port.
*
*/
void isci_port_formed(struct asd_sas_phy *phy)
{
pr_debug("%s: sas_phy = %p, sas_port = %p\n", __func__, phy, phy->port);
}
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