q3k/linux
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
linux/drivers/scsi/isci/port.c
Marcin Tomczak 05b080fc93 [SCSI] isci: fix, prevent port from getting stuck in the 'configuring' state 
When expander connected in x2 or x4 mode and with IO runnning, if
a cable from wideport is plugged out from the phy, IO's start failing
on all the targets.

Observed that when cable is pulled with IO running, cominit is
happening on all the links and IO's start dropping to 0 and eventually
the whole IO fails. Second observation, target is trying to open and
SCU is responding with "Open reject no destination".

A cause of the problem is when the port went from the "ready
configuring substate" back to "ready configuring substate" as a result
of phy being pulled off, scic suspended the port task scheduler
register. As a result no IO was allowed and in the "substate
configuring enter" routine the IO never goes back to 0. As a result
the port never comes out of "ready substate configuring".

The patch adds a mechanism of activate and deactivate phy when a port
link up, which fixes the problem.

Signed-off-by: Bartek Nowakowski <bartek.nowakowski@intel.com>
Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Marcin Tomczak <marcin.tomczak@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-01-16 11:48:02 +04:00

1749 lines
52 KiB
C
Raw Blame History

/*
* 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);
}
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;
BUG_ON(iphy->isci_port != NULL);
iphy->isci_port = iport;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_port = %p\n",
__func__, iport);
spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);
isci_port_change_state(iphy->isci_port, isci_starting);
sci_port_get_properties(iport, &properties);
if (iphy->protocol == SCIC_SDS_PHY_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 == SCIC_SDS_PHY_PROTOCOL_SAS) {
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: unkown 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);
}
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 isci_host *ihost,
struct isci_port *iport,
enum sci_status completion_status)
{
dev_dbg(&ihost->pdev->dev, "Port stop complete\n");
}
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)
{
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;
if (completion_status != SCI_SUCCESS) {
/* The reset failed. The port state is now SCI_PORT_FAILED. */
if (isci_port->active_phy_mask == 0) {
/* 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(isci_port->isci_host,
&isci_port->isci_host->phys[
isci_port->last_active_phy],
isci_port);
}
/* Advance the port state so that link state changes will be
* noticed.
*/
port_state_machine_change(isci_port, SCI_PORT_SUB_WAITING);
}
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
* 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 != SCIC_SDS_PHY_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 != SCIC_SDS_PHY_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 == SCIC_SDS_PHY_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(unsigned long data)
{
struct sci_timer *tmr = (struct sci_timer *)data;
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 tiemout.\n",
__func__,
iport);
} else if (current_state == SCI_PORT_STOPPING) {
/* if the port is still stopping then the stop has not completed */
isci_port_stop_complete(iport->owning_controller,
iport,
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(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;
isci_port_ready(ihost, iport);
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);
isci_port_not_ready(ihost, iport);
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) {
isci_port_not_ready(ihost, iport);
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: %d\n", __func__, 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: %d\n", __func__, 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: %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 && !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;
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: %d\n", __func__, 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: %d\n", __func__, 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: %d\n", __func__, 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: %d\n", __func__, 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: %d\n", __func__, 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: %d\n", __func__, 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
isci_port_not_ready(ihost, iport);
/* 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);
}
/* --------------------------------------------------------------------------- */
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->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 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;
}
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);
}
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 = sci_port_hard_reset(iport, 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;
dev_err(&ihost->pdev->dev,
"%s: iport = %p; hard reset failed (0x%x)\n",
__func__, iport, iport->hard_reset_status);
}
} else {
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);
}
/* 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) - driving explicit link fail for all phys\n",
__func__, iport, iport->hard_reset_status);
}
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);
}
Reference in a new issue View git blame Copy permalink