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authorLinus Torvalds <torvalds@linux-foundation.org>2011-07-04 15:54:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-04 15:54:37 -0700
commit532df6f3faa66b28b9b053775f5fa33761b8104e (patch)
tree40486a71d0d45508f887ebdf84f51008adfdf8db /drivers/scsi/isci/port_config.c
parentfc52693f8f54485af29be1adc90ce2bd54ad325f (diff)
parenta5ec7f86dc5432c44d8407a144e7617ec65da770 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6: (277 commits) [SCSI] isci: fix checkpatch errors isci: Device reset should request sas_phy_reset(phy, true) isci: pare back error messsages isci: cleanup silicon revision detection isci: merge scu_unsolicited_frame.h into unsolicited_frame_control.h isci: merge sata.[ch] into request.c isci: kill 'get/set' macros isci: retire scic_sds_ and scic_ prefixes isci: unify isci_host and scic_sds_controller isci: unify isci_remote_device and scic_sds_remote_device isci: unify isci_port and scic_sds_port isci: fix scic_sds_remote_device_terminate_requests isci: unify isci_phy and scic_sds_phy isci: unify isci_request and scic_sds_request isci: rename / clean up scic_sds_stp_request isci: preallocate requests isci: combine request flags isci: unify can_queue tracking on the tci_pool, uplevel tag assignment isci: Terminate dev requests on FIS err bit rx in NCQ isci: fix frame received locking ...
Diffstat (limited to 'drivers/scsi/isci/port_config.c')
-rw-r--r--drivers/scsi/isci/port_config.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/drivers/scsi/isci/port_config.c b/drivers/scsi/isci/port_config.c
new file mode 100644
index 000000000000..486b113c634a
--- /dev/null
+++ b/drivers/scsi/isci/port_config.c
@@ -0,0 +1,754 @@
+/*
+ * 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 (100)
+
+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. */
+ while (phy_index < SCI_MAX_PHYS) {
+ 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);
+ }
+
+ 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);
+}
+
+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:
+ /*
+ * This can occur for either a link down event, or a link
+ * up event where we cannot yet tell the port to which a
+ * phy belongs.
+ */
+ if (port_agent->timer_pending)
+ sci_del_timer(&port_agent->timer);
+
+ port_agent->timer_pending = true;
+ sci_mod_timer(&port_agent->timer,
+ 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_configure_ports(ihost, port_agent, iphy, true);
+ } else {
+ /* the phy is already the part of the port */
+ u32 port_state = iport->sm.current_state_id;
+
+ /* if the PORT'S state is resetting then the link up is from
+ * port hard reset in this case, we need to tell the port
+ * that link up is recieved
+ */
+ BUG_ON(port_state != SCI_PORT_RESETTING);
+ 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)
+ return;
+
+ 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);
+ }
+
+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;
+ }
+}
+
+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;
+}

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