isci: rely on irq core for intx multiplexing, and silence screaming intx

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / isci / host.c

/*
 * 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 "scic_io_request.h"
#include "scic_remote_device.h"
#include "scic_port.h"

#include "port.h"
#include "request.h"
#include "host.h"
#include "probe_roms.h"
#include "core/scic_sds_controller.h"

irqreturn_t isci_msix_isr(int vec, void *data)
{
        struct isci_host *ihost = data;
        struct scic_sds_controller *scic = ihost->core_controller;

        if (scic_sds_controller_isr(scic))
                tasklet_schedule(&ihost->completion_tasklet);

        return IRQ_HANDLED;
}

irqreturn_t isci_intx_isr(int vec, void *data)
{
        irqreturn_t ret = IRQ_NONE;
        struct isci_host *ihost = data;
        struct scic_sds_controller *scic = ihost->core_controller;

        if (scic_sds_controller_isr(scic)) {
                writel(SMU_ISR_COMPLETION, &scic->smu_registers->interrupt_status);
                tasklet_schedule(&ihost->completion_tasklet);
                ret = IRQ_HANDLED;
        } else if (scic_sds_controller_error_isr(scic)) {
                spin_lock(&ihost->scic_lock);
                scic_sds_controller_error_handler(scic);
                spin_unlock(&ihost->scic_lock);
                ret = IRQ_HANDLED;
        }

        return ret;
}

irqreturn_t isci_error_isr(int vec, void *data)
{
        struct isci_host *ihost = data;
        struct scic_sds_controller *scic = ihost->core_controller;

        if (scic_sds_controller_error_isr(scic))
                scic_sds_controller_error_handler(scic);

        return IRQ_HANDLED;
}

/**
 * isci_host_start_complete() - This function is called by the core library,
 *    through the ISCI Module, to indicate controller start status.
 * @isci_host: This parameter specifies the ISCI host object
 * @completion_status: This parameter specifies the completion status from the
 *    core library.
 *
 */
void isci_host_start_complete(struct isci_host *ihost, enum sci_status completion_status)
{
        if (completion_status != SCI_SUCCESS)
                dev_info(&ihost->pdev->dev,
                        "controller start timed out, continuing...\n");
        isci_host_change_state(ihost, isci_ready);
        clear_bit(IHOST_START_PENDING, &ihost->flags);
        wake_up(&ihost->eventq);
}

int isci_host_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
        struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;

        if (test_bit(IHOST_START_PENDING, &ihost->flags))
                return 0;

        /* todo: use sas_flush_discovery once it is upstream */
        scsi_flush_work(shost);

        scsi_flush_work(shost);

        dev_dbg(&ihost->pdev->dev,
                "%s: ihost->status = %d, time = %ld\n",
                 __func__, isci_host_get_state(ihost), time);

        return 1;

}

void isci_host_scan_start(struct Scsi_Host *shost)
{
        struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
        struct scic_sds_controller *scic = ihost->core_controller;
        unsigned long tmo = scic_controller_get_suggested_start_timeout(scic);

        set_bit(IHOST_START_PENDING, &ihost->flags);

        spin_lock_irq(&ihost->scic_lock);
        scic_controller_start(scic, tmo);
        scic_controller_enable_interrupts(scic);
        spin_unlock_irq(&ihost->scic_lock);
}

void isci_host_stop_complete(struct isci_host *ihost, enum sci_status completion_status)
{
        isci_host_change_state(ihost, isci_stopped);
        scic_controller_disable_interrupts(ihost->core_controller);
        clear_bit(IHOST_STOP_PENDING, &ihost->flags);
        wake_up(&ihost->eventq);
}

/**
 * isci_host_completion_routine() - This function is the delayed service
 *    routine that calls the sci core library's completion handler. It's
 *    scheduled as a tasklet from the interrupt service routine when interrupts
 *    in use, or set as the timeout function in polled mode.
 * @data: This parameter specifies the ISCI host object
 *
 */
static void isci_host_completion_routine(unsigned long data)
{
        struct isci_host *isci_host = (struct isci_host *)data;
        struct list_head    completed_request_list;
        struct list_head    errored_request_list;
        struct list_head    *current_position;
        struct list_head    *next_position;
        struct isci_request *request;
        struct isci_request *next_request;
        struct sas_task     *task;

        INIT_LIST_HEAD(&completed_request_list);
        INIT_LIST_HEAD(&errored_request_list);

        spin_lock_irq(&isci_host->scic_lock);

        scic_sds_controller_completion_handler(isci_host->core_controller);

        /* Take the lists of completed I/Os from the host. */

        list_splice_init(&isci_host->requests_to_complete,
                         &completed_request_list);

        /* Take the list of errored I/Os from the host. */
        list_splice_init(&isci_host->requests_to_errorback,
                         &errored_request_list);

        spin_unlock_irq(&isci_host->scic_lock);

        /* Process any completions in the lists. */
        list_for_each_safe(current_position, next_position,
                           &completed_request_list) {

                request = list_entry(current_position, struct isci_request,
                                     completed_node);
                task = isci_request_access_task(request);

                /* Normal notification (task_done) */
                dev_dbg(&isci_host->pdev->dev,
                        "%s: Normal - request/task = %p/%p\n",
                        __func__,
                        request,
                        task);

                /* Return the task to libsas */
                if (task != NULL) {

                        task->lldd_task = NULL;
                        if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {

                                /* If the task is already in the abort path,
                                * the task_done callback cannot be called.
                                */
                                task->task_done(task);
                        }
                }
                /* Free the request object. */
                isci_request_free(isci_host, request);
        }
        list_for_each_entry_safe(request, next_request, &errored_request_list,
                                 completed_node) {

                task = isci_request_access_task(request);

                /* Use sas_task_abort */
                dev_warn(&isci_host->pdev->dev,
                         "%s: Error - request/task = %p/%p\n",
                         __func__,
                         request,
                         task);

                if (task != NULL) {

                        /* Put the task into the abort path if it's not there
                         * already.
                         */
                        if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED))
                                sas_task_abort(task);

                } else {
                        /* This is a case where the request has completed with a
                         * status such that it needed further target servicing,
                         * but the sas_task reference has already been removed
                         * from the request.  Since it was errored, it was not
                         * being aborted, so there is nothing to do except free
                         * it.
                         */

                        spin_lock_irq(&isci_host->scic_lock);
                        /* Remove the request from the remote device's list
                        * of pending requests.
                        */
                        list_del_init(&request->dev_node);
                        spin_unlock_irq(&isci_host->scic_lock);

                        /* Free the request object. */
                        isci_request_free(isci_host, request);
                }
        }

}

void isci_host_deinit(struct isci_host *ihost)
{
        struct scic_sds_controller *scic = ihost->core_controller;
        int i;

        isci_host_change_state(ihost, isci_stopping);
        for (i = 0; i < SCI_MAX_PORTS; i++) {
                struct isci_port *port = &ihost->isci_ports[i];
                struct isci_remote_device *idev, *d;

                list_for_each_entry_safe(idev, d, &port->remote_dev_list, node) {
                        isci_remote_device_change_state(idev, isci_stopping);
                        isci_remote_device_stop(ihost, idev);
                }
        }

        set_bit(IHOST_STOP_PENDING, &ihost->flags);

        spin_lock_irq(&ihost->scic_lock);
        scic_controller_stop(scic, SCIC_CONTROLLER_STOP_TIMEOUT);
        spin_unlock_irq(&ihost->scic_lock);

        wait_for_stop(ihost);
        scic_controller_reset(scic);
        isci_timer_list_destroy(ihost);
}

static void __iomem *scu_base(struct isci_host *isci_host)
{
        struct pci_dev *pdev = isci_host->pdev;
        int id = isci_host->id;

        return pcim_iomap_table(pdev)[SCI_SCU_BAR * 2] + SCI_SCU_BAR_SIZE * id;
}

static void __iomem *smu_base(struct isci_host *isci_host)
{
        struct pci_dev *pdev = isci_host->pdev;
        int id = isci_host->id;

        return pcim_iomap_table(pdev)[SCI_SMU_BAR * 2] + SCI_SMU_BAR_SIZE * id;
}

static void isci_user_parameters_get(
                struct isci_host *isci_host,
                union scic_user_parameters *scic_user_params)
{
        struct scic_sds_user_parameters *u = &scic_user_params->sds1;
        int i;

        for (i = 0; i < SCI_MAX_PHYS; i++) {
                struct sci_phy_user_params *u_phy = &u->phys[i];

                u_phy->max_speed_generation = phy_gen;

                /* we are not exporting these for now */
                u_phy->align_insertion_frequency = 0x7f;
                u_phy->in_connection_align_insertion_frequency = 0xff;
                u_phy->notify_enable_spin_up_insertion_frequency = 0x33;
        }

        u->stp_inactivity_timeout = stp_inactive_to;
        u->ssp_inactivity_timeout = ssp_inactive_to;
        u->stp_max_occupancy_timeout = stp_max_occ_to;
        u->ssp_max_occupancy_timeout = ssp_max_occ_to;
        u->no_outbound_task_timeout = no_outbound_task_to;
        u->max_number_concurrent_device_spin_up = max_concurr_spinup;
}

int isci_host_init(struct isci_host *isci_host)
{
        int err = 0, i;
        enum sci_status status;
        struct scic_sds_controller *controller;
        union scic_oem_parameters oem;
        union scic_user_parameters scic_user_params;
        struct isci_pci_info *pci_info = to_pci_info(isci_host->pdev);

        isci_timer_list_construct(isci_host);

        controller = scic_controller_alloc(&isci_host->pdev->dev);

        if (!controller) {
                dev_err(&isci_host->pdev->dev,
                        "%s: failed (%d)\n",
                        __func__,
                        err);
                return -ENOMEM;
        }

        isci_host->core_controller = controller;
        sci_object_set_association(isci_host->core_controller, isci_host);
        spin_lock_init(&isci_host->state_lock);
        spin_lock_init(&isci_host->scic_lock);
        spin_lock_init(&isci_host->queue_lock);
        init_waitqueue_head(&isci_host->eventq);

        isci_host_change_state(isci_host, isci_starting);
        isci_host->can_queue = ISCI_CAN_QUEUE_VAL;

        status = scic_controller_construct(controller, scu_base(isci_host),
                                           smu_base(isci_host));

        if (status != SCI_SUCCESS) {
                dev_err(&isci_host->pdev->dev,
                        "%s: scic_controller_construct failed - status = %x\n",
                        __func__,
                        status);
                return -ENODEV;
        }

        isci_host->sas_ha.dev = &isci_host->pdev->dev;
        isci_host->sas_ha.lldd_ha = isci_host;

        /*
         * grab initial values stored in the controller object for OEM and USER
         * parameters
         */
        isci_user_parameters_get(isci_host, &scic_user_params);
        status = scic_user_parameters_set(isci_host->core_controller,
                                          &scic_user_params);
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
                         "%s: scic_user_parameters_set failed\n",
                         __func__);
                return -ENODEV;
        }

        scic_oem_parameters_get(controller, &oem);

        /* grab any OEM parameters specified in orom */
        if (pci_info->orom) {
                status = isci_parse_oem_parameters(&oem,
                                                   pci_info->orom,
                                                   isci_host->id);
                if (status != SCI_SUCCESS) {
                        dev_warn(&isci_host->pdev->dev,
                                 "parsing firmware oem parameters failed\n");
                        return -EINVAL;
                }
        }

        status = scic_oem_parameters_set(isci_host->core_controller, &oem);
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
                                "%s: scic_oem_parameters_set failed\n",
                                __func__);
                return -ENODEV;
        }

        tasklet_init(&isci_host->completion_tasklet,
                     isci_host_completion_routine, (unsigned long)isci_host);

        INIT_LIST_HEAD(&isci_host->requests_to_complete);
        INIT_LIST_HEAD(&isci_host->requests_to_errorback);

        spin_lock_irq(&isci_host->scic_lock);
        status = scic_controller_initialize(isci_host->core_controller);
        spin_unlock_irq(&isci_host->scic_lock);
        if (status != SCI_SUCCESS) {
                dev_warn(&isci_host->pdev->dev,
                         "%s: scic_controller_initialize failed -"
                         " status = 0x%x\n",
                         __func__, status);
                return -ENODEV;
        }

        err = scic_controller_mem_init(isci_host->core_controller);
        if (err)
                return err;

        /*
         * keep the pool alloc size around, will use it for a bounds checking
         * when trying to convert virtual addresses to physical addresses
         */
        isci_host->dma_pool_alloc_size = sizeof(struct isci_request) +
                                         scic_io_request_get_object_size();
        isci_host->dma_pool = dmam_pool_create(DRV_NAME, &isci_host->pdev->dev,
                                               isci_host->dma_pool_alloc_size,
                                               SLAB_HWCACHE_ALIGN, 0);

        if (!isci_host->dma_pool)
                return -ENOMEM;

        for (i = 0; i < SCI_MAX_PORTS; i++)
                isci_port_init(&isci_host->isci_ports[i], isci_host, i);

        for (i = 0; i < SCI_MAX_PHYS; i++)
                isci_phy_init(&isci_host->phys[i], isci_host, i);

        for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
                struct isci_remote_device *idev = idev_by_id(isci_host, i);

                INIT_LIST_HEAD(&idev->reqs_in_process);
                INIT_LIST_HEAD(&idev->node);
                spin_lock_init(&idev->state_lock);
        }

        return 0;
}