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Diffstat (limited to 'drivers/scsi/isci/port.c')
| -rw-r--r-- | drivers/scsi/isci/port.c | 1757 |
1 files changed, 1757 insertions, 0 deletions
diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c new file mode 100644 index 000000000000..8f6f9b77e41a --- /dev/null +++ b/drivers/scsi/isci/port.c @@ -0,0 +1,1757 @@ +/* + * 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. + */ +static 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); + } +} + +/* called under sci_lock to stabilize phy:port associations */ +void isci_port_bcn_enable(struct isci_host *ihost, struct isci_port *iport) +{ + int i; + + clear_bit(IPORT_BCN_BLOCKED, &iport->flags); + wake_up(&ihost->eventq); + + if (!test_and_clear_bit(IPORT_BCN_PENDING, &iport->flags)) + return; + + for (i = 0; i < ARRAY_SIZE(iport->phy_table); i++) { + struct isci_phy *iphy = iport->phy_table[i]; + + if (!iphy) + continue; + + ihost->sas_ha.notify_port_event(&iphy->sas_phy, + PORTE_BROADCAST_RCVD); + break; + } +} + +static void isci_port_bc_change_received(struct isci_host *ihost, + struct isci_port *iport, + struct isci_phy *iphy) +{ + if (iport && test_bit(IPORT_BCN_BLOCKED, &iport->flags)) { + dev_dbg(&ihost->pdev->dev, + "%s: disabled BCN; isci_phy = %p, sas_phy = %p\n", + __func__, iphy, &iphy->sas_phy); + set_bit(IPORT_BCN_PENDING, &iport->flags); + atomic_inc(&iport->event); + wake_up(&ihost->eventq); + } else { + 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) { + atomic_inc(&isci_port->event); + isci_port_bcn_enable(isci_host, isci_port); + + /* 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"); +} + +/** + * 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 + * 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_activate_phy(struct isci_port *iport, struct isci_phy *iphy, + bool do_notify_user) +{ + struct isci_host *ihost = iport->owning_controller; + + if (iphy->protocol != SCIC_SDS_PHY_PROTOCOL_SATA) + sci_phy_resume(iphy); + + iport->active_phy_mask |= 1 << iphy->phy_index; + + sci_controller_clear_invalid_phy(ihost, iphy); + + if (do_notify_user == true) + 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); + + iphy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN; + + /* Re-assign the phy back to the LP as if it were a narrow port */ + 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"); + } +} + +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; +} + +/** + * 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. + * @do_notify_user: This parameter specifies whether to inform the user (via + * sci_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 sci_port_general_link_up_handler(struct isci_port *iport, + struct isci_phy *iphy, + bool do_notify_user) +{ + 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, do_notify_user); + 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) && + sci_port_is_wide(iport)) { + sci_port_invalid_link_up(iport, iphy); + + return false; + } + + 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 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]); + } + } + + sci_port_update_viit_entry(iport); + + sci_port_resume_port_task_scheduler(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 if (iport->started_request_count == 0) + port_state_machine_change(iport, + SCI_PORT_SUB_OPERATIONAL); +} + +static void sci_port_ready_substate_configuring_exit(struct sci_base_state_machine *sm) +{ + struct isci_port *iport = container_of(sm, typeof(*iport), sm); + + sci_port_suspend_port_task_scheduler(iport); + if (iport->ready_exit) + sci_port_invalidate_dummy_remote_node(iport); +} + +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, true); + 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, 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; + } +} + +/** + * 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, true); + + 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, 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. + */ + sci_port_general_link_up_handler(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_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, + }, + [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, + .exit_state = sci_port_ready_substate_configuring_exit + }, + [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->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); + atomic_set(&iport->event, 0); +} + +/** + * 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 idx, 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; + } 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); + + /* Down all phys in the port. */ + spin_lock_irqsave(&ihost->scic_lock, flags); + for (idx = 0; idx < SCI_MAX_PHYS; ++idx) { + struct isci_phy *iphy = iport->phy_table[idx]; + + if (!iphy) + continue; + sci_phy_stop(iphy); + sci_phy_start(iphy); + } + spin_unlock_irqrestore(&ihost->scic_lock, flags); + } + 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); +} |