/* * 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 "host.h" #define SCIC_SDS_MPC_RECONFIGURATION_TIMEOUT (10) #define SCIC_SDS_APC_RECONFIGURATION_TIMEOUT (10) #define SCIC_SDS_APC_WAIT_LINK_UP_NOTIFICATION (1000) enum SCIC_SDS_APC_ACTIVITY { SCIC_SDS_APC_SKIP_PHY, SCIC_SDS_APC_ADD_PHY, SCIC_SDS_APC_START_TIMER, SCIC_SDS_APC_ACTIVITY_MAX }; /* * ****************************************************************************** * General port configuration agent routines * ****************************************************************************** */ /** * * @address_one: A SAS Address to be compared. * @address_two: A SAS Address to be compared. * * Compare the two SAS Address and if SAS Address One is greater than SAS * Address Two then return > 0 else if SAS Address One is less than SAS Address * Two return < 0 Otherwise they are the same return 0 A signed value of x > 0 * > y where x is returned for Address One > Address Two y is returned for * Address One < Address Two 0 is returned ofr Address One = Address Two */ static s32 sci_sas_address_compare( struct sci_sas_address address_one, struct sci_sas_address address_two) { if (address_one.high > address_two.high) { return 1; } else if (address_one.high < address_two.high) { return -1; } else if (address_one.low > address_two.low) { return 1; } else if (address_one.low < address_two.low) { return -1; } /* The two SAS Address must be identical */ return 0; } /** * * @controller: The controller object used for the port search. * @phy: The phy object to match. * * This routine will find a matching port for the phy. This means that the * port and phy both have the same broadcast sas address and same received sas * address. The port address or the NULL if there is no matching * port. port address if the port can be found to match the phy. * NULL if there is no matching port for the phy. */ static struct isci_port *sci_port_configuration_agent_find_port( struct isci_host *ihost, struct isci_phy *iphy) { u8 i; struct sci_sas_address port_sas_address; struct sci_sas_address port_attached_device_address; struct sci_sas_address phy_sas_address; struct sci_sas_address phy_attached_device_address; /* * Since this phy can be a member of a wide port check to see if one or * more phys match the sent and received SAS address as this phy in which * case it should participate in the same port. */ sci_phy_get_sas_address(iphy, &phy_sas_address); sci_phy_get_attached_sas_address(iphy, &phy_attached_device_address); for (i = 0; i < ihost->logical_port_entries; i++) { struct isci_port *iport = &ihost->ports[i]; sci_port_get_sas_address(iport, &port_sas_address); sci_port_get_attached_sas_address(iport, &port_attached_device_address); if (sci_sas_address_compare(port_sas_address, phy_sas_address) == 0 && sci_sas_address_compare(port_attached_device_address, phy_attached_device_address) == 0) return iport; } return NULL; } /** * * @controller: This is the controller object that contains the port agent * @port_agent: This is the port configruation agent for the controller. * * This routine will validate the port configuration is correct for the SCU * hardware. The SCU hardware allows for port configurations as follows. LP0 * -> (PE0), (PE0, PE1), (PE0, PE1, PE2, PE3) LP1 -> (PE1) LP2 -> (PE2), (PE2, * PE3) LP3 -> (PE3) enum sci_status SCI_SUCCESS the port configuration is valid for * this port configuration agent. SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION * the port configuration is not valid for this port configuration agent. */ static enum sci_status sci_port_configuration_agent_validate_ports( struct isci_host *ihost, struct sci_port_configuration_agent *port_agent) { struct sci_sas_address first_address; struct sci_sas_address second_address; /* * Sanity check the max ranges for all the phys the max index * is always equal to the port range index */ if (port_agent->phy_valid_port_range[0].max_index != 0 || port_agent->phy_valid_port_range[1].max_index != 1 || port_agent->phy_valid_port_range[2].max_index != 2 || port_agent->phy_valid_port_range[3].max_index != 3) return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; /* * This is a request to configure a single x4 port or at least attempt * to make all the phys into a single port */ if (port_agent->phy_valid_port_range[0].min_index == 0 && port_agent->phy_valid_port_range[1].min_index == 0 && port_agent->phy_valid_port_range[2].min_index == 0 && port_agent->phy_valid_port_range[3].min_index == 0) return SCI_SUCCESS; /* * This is a degenerate case where phy 1 and phy 2 are assigned * to the same port this is explicitly disallowed by the hardware * unless they are part of the same x4 port and this condition was * already checked above. */ if (port_agent->phy_valid_port_range[2].min_index == 1) { return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } /* * PE0 and PE3 can never have the same SAS Address unless they * are part of the same x4 wide port and we have already checked * for this condition. */ sci_phy_get_sas_address(&ihost->phys[0], &first_address); sci_phy_get_sas_address(&ihost->phys[3], &second_address); if (sci_sas_address_compare(first_address, second_address) == 0) { return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } /* * PE0 and PE1 are configured into a 2x1 ports make sure that the * SAS Address for PE0 and PE2 are different since they can not be * part of the same port. */ if (port_agent->phy_valid_port_range[0].min_index == 0 && port_agent->phy_valid_port_range[1].min_index == 1) { sci_phy_get_sas_address(&ihost->phys[0], &first_address); sci_phy_get_sas_address(&ihost->phys[2], &second_address); if (sci_sas_address_compare(first_address, second_address) == 0) { return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } } /* * PE2 and PE3 are configured into a 2x1 ports make sure that the * SAS Address for PE1 and PE3 are different since they can not be * part of the same port. */ if (port_agent->phy_valid_port_range[2].min_index == 2 && port_agent->phy_valid_port_range[3].min_index == 3) { sci_phy_get_sas_address(&ihost->phys[1], &first_address); sci_phy_get_sas_address(&ihost->phys[3], &second_address); if (sci_sas_address_compare(first_address, second_address) == 0) { return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } } return SCI_SUCCESS; } /* * ****************************************************************************** * Manual port configuration agent routines * ****************************************************************************** */ /* verify all of the phys in the same port are using the same SAS address */ static enum sci_status sci_mpc_agent_validate_phy_configuration(struct isci_host *ihost, struct sci_port_configuration_agent *port_agent) { u32 phy_mask; u32 assigned_phy_mask; struct sci_sas_address sas_address; struct sci_sas_address phy_assigned_address; u8 port_index; u8 phy_index; assigned_phy_mask = 0; sas_address.high = 0; sas_address.low = 0; for (port_index = 0; port_index < SCI_MAX_PORTS; port_index++) { phy_mask = ihost->oem_parameters.ports[port_index].phy_mask; if (!phy_mask) continue; /* * Make sure that one or more of the phys were not already assinged to * a different port. */ if ((phy_mask & ~assigned_phy_mask) == 0) { return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } /* Find the starting phy index for this round through the loop */ for (phy_index = 0; phy_index < SCI_MAX_PHYS; phy_index++) { if ((phy_mask & (1 << phy_index)) == 0) continue; sci_phy_get_sas_address(&ihost->phys[phy_index], &sas_address); /* * The phy_index can be used as the starting point for the * port range since the hardware starts all logical ports * the same as the PE index. */ port_agent->phy_valid_port_range[phy_index].min_index = port_index; port_agent->phy_valid_port_range[phy_index].max_index = phy_index; if (phy_index != port_index) { return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } break; } /* * See how many additional phys are being added to this logical port. * Note: We have not moved the current phy_index so we will actually * compare the startting phy with itself. * This is expected and required to add the phy to the port. */ for (; phy_index < SCI_MAX_PHYS; phy_index++) { if ((phy_mask & (1 << phy_index)) == 0) continue; sci_phy_get_sas_address(&ihost->phys[phy_index], &phy_assigned_address); if (sci_sas_address_compare(sas_address, phy_assigned_address) != 0) { /* * The phy mask specified that this phy is part of the same port * as the starting phy and it is not so fail this configuration */ return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION; } port_agent->phy_valid_port_range[phy_index].min_index = port_index; port_agent->phy_valid_port_range[phy_index].max_index = phy_index; sci_port_add_phy(&ihost->ports[port_index], &ihost->phys[phy_index]); assigned_phy_mask |= (1 << phy_index); } } return sci_port_configuration_agent_validate_ports(ihost, port_agent); } static void mpc_agent_timeout(unsigned long data) { u8 index; struct sci_timer *tmr = (struct sci_timer *)data; struct sci_port_configuration_agent *port_agent; struct isci_host *ihost; unsigned long flags; u16 configure_phy_mask; port_agent = container_of(tmr, typeof(*port_agent), timer); ihost = container_of(port_agent, typeof(*ihost), port_agent); spin_lock_irqsave(&ihost->scic_lock, flags); if (tmr->cancel) goto done; port_agent->timer_pending = false; /* Find the mask of phys that are reported read but as yet unconfigured into a port */ configure_phy_mask = ~port_agent->phy_configured_mask & port_agent->phy_ready_mask; for (index = 0; index < SCI_MAX_PHYS; index++) { struct isci_phy *iphy = &ihost->phys[index]; if (configure_phy_mask & (1 << index)) { port_agent->link_up_handler(ihost, port_agent, phy_get_non_dummy_port(iphy), iphy); } } done: spin_unlock_irqrestore(&ihost->scic_lock, flags); } static void sci_mpc_agent_link_up(struct isci_host *ihost, struct sci_port_configuration_agent *port_agent, struct isci_port *iport, struct isci_phy *iphy) { /* If the port is NULL then the phy was not assigned to a port. * This is because the phy was not given the same SAS Address as * the other PHYs in the port. */ if (!iport) return; port_agent->phy_ready_mask |= (1 << iphy->phy_index); sci_port_link_up(iport, iphy); if ((iport->active_phy_mask & (1 << iphy->phy_index))) port_agent->phy_configured_mask |= (1 << iphy->phy_index); } /** * * @controller: This is the controller object that receives the link down * notification. * @port: This is the port object associated with the phy. If the is no * associated port this is an NULL. The port is an invalid * handle only if the phy was never port of this port. This happens when * the phy is not broadcasting the same SAS address as the other phys in the * assigned port. * @phy: This is the phy object which has gone link down. * * This function handles the manual port configuration link down notifications. * Since all ports and phys are associated at initialization time we just turn * around and notifiy the port object of the link down event. If this PHY is * not associated with a port there is no action taken. Is it possible to get a * link down notification from a phy that has no assocoated port? */ static void sci_mpc_agent_link_down( struct isci_host *ihost, struct sci_port_configuration_agent *port_agent, struct isci_port *iport, struct isci_phy *iphy) { if (iport != NULL) { /* * If we can form a new port from the remainder of the phys * then we want to start the timer to allow the SCI User to * cleanup old devices and rediscover the port before * rebuilding the port with the phys that remain in the ready * state. */ port_agent->phy_ready_mask &= ~(1 << iphy->phy_index); port_agent->phy_configured_mask &= ~(1 << iphy->phy_index); /* * Check to see if there are more phys waiting to be * configured into a port. If there are allow the SCI User * to tear down this port, if necessary, and then reconstruct * the port after the timeout. */ if ((port_agent->phy_configured_mask == 0x0000) && (port_agent->phy_ready_mask != 0x0000) && !port_agent->timer_pending) { port_agent->timer_pending = true; sci_mod_timer(&port_agent->timer, SCIC_SDS_MPC_RECONFIGURATION_TIMEOUT); } sci_port_link_down(iport, iphy); } } /* verify phys are assigned a valid SAS address for automatic port * configuration mode. */ static enum sci_status sci_apc_agent_validate_phy_configuration(struct isci_host *ihost, struct sci_port_configuration_agent *port_agent) { u8 phy_index; u8 port_index; struct sci_sas_address sas_address; struct sci_sas_address phy_assigned_address; phy_index = 0; while (phy_index < SCI_MAX_PHYS) { port_index = phy_index; /* Get the assigned SAS Address for the first PHY on the controller. */ sci_phy_get_sas_address(&ihost->phys[phy_index], &sas_address); while (++phy_index < SCI_MAX_PHYS) { sci_phy_get_sas_address(&ihost->phys[phy_index], &phy_assigned_address); /* Verify each of the SAS address are all the same for every PHY */ if (sci_sas_address_compare(sas_address, phy_assigned_address) == 0) { port_agent->phy_valid_port_range[phy_index].min_index = port_index; port_agent->phy_valid_port_range[phy_index].max_index = phy_index; } else { port_agent->phy_valid_port_range[phy_index].min_index = phy_index; port_agent->phy_valid_port_range[phy_index].max_index = phy_index; break; } } } return sci_port_configuration_agent_validate_ports(ihost, port_agent); } /* * This routine will restart the automatic port configuration timeout * timer for the next time period. This could be caused by either a link * down event or a link up event where we can not yet tell to which a phy * belongs. */ static void sci_apc_agent_start_timer(struct sci_port_configuration_agent *port_agent, u32 timeout) { port_agent->timer_pending = true; sci_mod_timer(&port_agent->timer, timeout); } static void sci_apc_agent_configure_ports(struct isci_host *ihost, struct sci_port_configuration_agent *port_agent, struct isci_phy *iphy, bool start_timer) { u8 port_index; enum sci_status status; struct isci_port *iport; enum SCIC_SDS_APC_ACTIVITY apc_activity = SCIC_SDS_APC_SKIP_PHY; iport = sci_port_configuration_agent_find_port(ihost, iphy); if (iport) { if (sci_port_is_valid_phy_assignment(iport, iphy->phy_index)) apc_activity = SCIC_SDS_APC_ADD_PHY; else apc_activity = SCIC_SDS_APC_SKIP_PHY; } else { /* * There is no matching Port for this PHY so lets search through the * Ports and see if we can add the PHY to its own port or maybe start * the timer and wait to see if a wider port can be made. * * Note the break when we reach the condition of the port id == phy id */ for (port_index = port_agent->phy_valid_port_range[iphy->phy_index].min_index; port_index <= port_agent->phy_valid_port_range[iphy->phy_index].max_index; port_index++) { iport = &ihost->ports[port_index]; /* First we must make sure that this PHY can be added to this Port. */ if (sci_port_is_valid_phy_assignment(iport, iphy->phy_index)) { /* * Port contains a PHY with a greater PHY ID than the current * PHY that has gone link up. This phy can not be part of any * port so skip it and move on. */ if (iport->active_phy_mask > (1 << iphy->phy_index)) { apc_activity = SCIC_SDS_APC_SKIP_PHY; break; } /* * We have reached the end of our Port list and have not found * any reason why we should not either add the PHY to the port * or wait for more phys to become active. */ if (iport->physical_port_index == iphy->phy_index) { /* * The Port either has no active PHYs. * Consider that if the port had any active PHYs we would have * or active PHYs with * a lower PHY Id than this PHY. */ if (apc_activity != SCIC_SDS_APC_START_TIMER) { apc_activity = SCIC_SDS_APC_ADD_PHY; } break; } /* * The current Port has no active PHYs and this PHY could be part * of this Port. Since we dont know as yet setup to start the * timer and see if there is a better configuration. */ if (iport->active_phy_mask == 0) { apc_activity = SCIC_SDS_APC_START_TIMER; } } else if (iport->active_phy_mask != 0) { /* * The Port has an active phy and the current Phy can not * participate in this port so skip the PHY and see if * there is a better configuration. */ apc_activity = SCIC_SDS_APC_SKIP_PHY; } } } /* * Check to see if the start timer operations should instead map to an * add phy operation. This is caused because we have been waiting to * add a phy to a port but could not becuase the automatic port * configuration engine had a choice of possible ports for the phy. * Since we have gone through a timeout we are going to restrict the * choice to the smallest possible port. */ if ( (start_timer == false) && (apc_activity == SCIC_SDS_APC_START_TIMER) ) { apc_activity = SCIC_SDS_APC_ADD_PHY; } switch (apc_activity) { case SCIC_SDS_APC_ADD_PHY: status = sci_port_add_phy(iport, iphy); if (status == SCI_SUCCESS) { port_agent->phy_configured_mask |= (1 << iphy->phy_index); } break; case SCIC_SDS_APC_START_TIMER: sci_apc_agent_start_timer(port_agent, SCIC_SDS_APC_WAIT_LINK_UP_NOTIFICATION); break; case SCIC_SDS_APC_SKIP_PHY: default: /* do nothing the PHY can not be made part of a port at this time. */ break; } } /** * sci_apc_agent_link_up - handle apc link up events * @scic: This is the controller object that receives the link up * notification. * @sci_port: This is the port object associated with the phy. If the is no * associated port this is an NULL. * @sci_phy: This is the phy object which has gone link up. * * This method handles the automatic port configuration for link up * notifications. Is it possible to get a link down notification from a phy * that has no assocoated port? */ static void sci_apc_agent_link_up(struct isci_host *ihost, struct sci_port_configuration_agent *port_agent, struct isci_port *iport, struct isci_phy *iphy) { u8 phy_index = iphy->phy_index; if (!iport) { /* the phy is not the part of this port */ port_agent->phy_ready_mask |= 1 << phy_index; sci_apc_agent_start_timer(port_agent, SCIC_SDS_APC_WAIT_LINK_UP_NOTIFICATION); } else { /* the phy is already the part of the port */ port_agent->phy_ready_mask |= 1 << phy_index; sci_port_link_up(iport, iphy); } } /** * * @controller: This is the controller object that receives the link down * notification. * @iport: This is the port object associated with the phy. If the is no * associated port this is an NULL. * @iphy: This is the phy object which has gone link down. * * This method handles the automatic port configuration link down * notifications. not associated with a port there is no action taken. Is it * possible to get a link down notification from a phy that has no assocoated * port? */ static void sci_apc_agent_link_down( struct isci_host *ihost, struct sci_port_configuration_agent *port_agent, struct isci_port *iport, struct isci_phy *iphy) { port_agent->phy_ready_mask &= ~(1 << iphy->phy_index); if (!iport) return; if (port_agent->phy_configured_mask & (1 << iphy->phy_index)) { enum sci_status status; status = sci_port_remove_phy(iport, iphy); if (status == SCI_SUCCESS) port_agent->phy_configured_mask &= ~(1 << iphy->phy_index); } } /* configure the phys into ports when the timer fires */ static void apc_agent_timeout(unsigned long data) { u32 index; struct sci_timer *tmr = (struct sci_timer *)data; struct sci_port_configuration_agent *port_agent; struct isci_host *ihost; unsigned long flags; u16 configure_phy_mask; port_agent = container_of(tmr, typeof(*port_agent), timer); ihost = container_of(port_agent, typeof(*ihost), port_agent); spin_lock_irqsave(&ihost->scic_lock, flags); if (tmr->cancel) goto done; port_agent->timer_pending = false; configure_phy_mask = ~port_agent->phy_configured_mask & port_agent->phy_ready_mask; if (!configure_phy_mask) goto done; for (index = 0; index < SCI_MAX_PHYS; index++) { if ((configure_phy_mask & (1 << index)) == 0) continue; sci_apc_agent_configure_ports(ihost, port_agent, &ihost->phys[index], false); } if (is_controller_start_complete(ihost)) sci_controller_transition_to_ready(ihost, SCI_SUCCESS); done: spin_unlock_irqrestore(&ihost->scic_lock, flags); } /* * ****************************************************************************** * Public port configuration agent routines * ****************************************************************************** */ /** * * * This method will construct the port configuration agent for operation. This * call is universal for both manual port configuration and automatic port * configuration modes. */ void sci_port_configuration_agent_construct( struct sci_port_configuration_agent *port_agent) { u32 index; port_agent->phy_configured_mask = 0x00; port_agent->phy_ready_mask = 0x00; port_agent->link_up_handler = NULL; port_agent->link_down_handler = NULL; port_agent->timer_pending = false; for (index = 0; index < SCI_MAX_PORTS; index++) { port_agent->phy_valid_port_range[index].min_index = 0; port_agent->phy_valid_port_range[index].max_index = 0; } } bool is_port_config_apc(struct isci_host *ihost) { return ihost->port_agent.link_up_handler == sci_apc_agent_link_up; } enum sci_status sci_port_configuration_agent_initialize( struct isci_host *ihost, struct sci_port_configuration_agent *port_agent) { enum sci_status status; enum sci_port_configuration_mode mode; mode = ihost->oem_parameters.controller.mode_type; if (mode == SCIC_PORT_MANUAL_CONFIGURATION_MODE) { status = sci_mpc_agent_validate_phy_configuration( ihost, port_agent); port_agent->link_up_handler = sci_mpc_agent_link_up; port_agent->link_down_handler = sci_mpc_agent_link_down; sci_init_timer(&port_agent->timer, mpc_agent_timeout); } else { status = sci_apc_agent_validate_phy_configuration( ihost, port_agent); port_agent->link_up_handler = sci_apc_agent_link_up; port_agent->link_down_handler = sci_apc_agent_link_down; sci_init_timer(&port_agent->timer, apc_agent_timeout); } return status; }