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    Subject[PATCH 10/16] ehca: event queue
    Signed-off-by: Heiko J Schick <schickhj@de.ibm.com>


    ehca_eq.c | 225 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 225 insertions(+)



    --- linux-2.6.17-rc2-orig/drivers/infiniband/hw/ehca/ehca_eq.c 1970-01-01 01:00:00.000000000 +0100
    +++ linux-2.6.17-rc2/drivers/infiniband/hw/ehca/ehca_eq.c 2006-04-27 08:34:02.000000000 +0200
    @@ -0,0 +1,225 @@
    +/*
    + * IBM eServer eHCA Infiniband device driver for Linux on POWER
    + *
    + * Event queue handling
    + *
    + * Authors: Waleri Fomin <fomin@de.ibm.com>
    + * Khadija Souissi <souissi@de.ibm.com>
    + * Reinhard Ernst <rernst@de.ibm.com>
    + * Heiko J Schick <schickhj@de.ibm.com>
    + * Hoang-Nam Nguyen <hnguyen@de.ibm.com>
    + *
    + *
    + * Copyright (c) 2005 IBM Corporation
    + *
    + * All rights reserved.
    + *
    + * This source code is distributed under a dual license of GPL v2.0 and OpenIB
    + * BSD.
    + *
    + * OpenIB BSD License
    + *
    + * 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.
    + *
    + * 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.
    + *
    + * $Id: ehca_eq.c,v 1.17 2006/04/27 06:34:02 schickhj Exp $
    + */
    +
    +#define DEB_PREFIX "e_eq"
    +
    +#include "ehca_classes.h"
    +#include "ehca_irq.h"
    +#include "ehca_iverbs.h"
    +#include "ehca_kernel.h"
    +#include "ehca_qes.h"
    +#include "hcp_if.h"
    +#include "ipz_pt_fn.h"
    +
    +int ehca_create_eq(struct ehca_shca *shca,
    + struct ehca_eq *eq,
    + const enum ehca_eq_type type, const u32 length)
    +{
    + u64 ret = H_SUCCESS;
    + u32 nr_pages = 0;
    + u32 i;
    + void *vpage = NULL;
    +
    + EDEB_EN(7, "shca=%p eq=%p length=%x", shca, eq, length);
    + EHCA_CHECK_ADR(shca);
    + EHCA_CHECK_ADR(eq);
    +
    + spin_lock_init(&eq->spinlock);
    + eq->is_initialized = 0;
    +
    + if (type!=EHCA_EQ && type!=EHCA_NEQ) {
    + EDEB_ERR(4, "Invalid EQ type %x. eq=%p", type, eq);
    + return -EINVAL;
    + }
    + if (length==0) {
    + EDEB_ERR(4, "EQ length must not be zero. eq=%p", eq);
    + return -EINVAL;
    + }
    +
    + ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
    + &eq->pf,
    + type,
    + length,
    + &eq->ipz_eq_handle,
    + &eq->length,
    + &nr_pages, &eq->ist);
    +
    + if (ret != H_SUCCESS) {
    + EDEB_ERR(4, "Can't allocate EQ / NEQ. eq=%p", eq);
    + return -EINVAL;
    + }
    +
    + ret = ipz_queue_ctor(&eq->ipz_queue, nr_pages,
    + EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0);
    + if (!ret) {
    + EDEB_ERR(4, "Can't allocate EQ pages. eq=%p", eq);
    + goto create_eq_exit1;
    + }
    +
    + for (i = 0; i < nr_pages; i++) {
    + u64 rpage;
    +
    + if (!(vpage = ipz_qpageit_get_inc(&eq->ipz_queue))) {
    + ret = H_RESOURCE;
    + goto create_eq_exit2;
    + }
    +
    + rpage = virt_to_abs(vpage);
    + ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
    + eq->ipz_eq_handle,
    + &eq->pf,
    + 0, 0, rpage, 1);
    +
    + if (i == (nr_pages - 1)) {
    + /* last page */
    + vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
    + if ((ret != H_SUCCESS) || (vpage != 0))
    + goto create_eq_exit2;
    + } else {
    + if ((ret != H_PAGE_REGISTERED) || (vpage == 0))
    + goto create_eq_exit2;
    + }
    + }
    +
    + ipz_qeit_reset(&eq->ipz_queue);
    +
    + /* register interrupt handlers and initialize work queues */
    + if (type == EHCA_EQ) {
    + ret = ibmebus_request_irq(NULL, eq->ist, ehca_interrupt_eq,
    + SA_INTERRUPT, "ehca_eq",
    + (void *)shca);
    + if (ret < 0)
    + EDEB_ERR(4, "Can't map interrupt handler.");
    +
    + tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
    + } else if (type == EHCA_NEQ) {
    + ret = ibmebus_request_irq(NULL, eq->ist, ehca_interrupt_neq,
    + SA_INTERRUPT, "ehca_neq",
    + (void *)shca);
    + if (ret < 0)
    + EDEB_ERR(4, "Can't map interrupt handler.");
    +
    + tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
    + }
    +
    + eq->is_initialized = 1;
    +
    + EDEB_EX(7, "ret=%lx", ret);
    +
    + return 0;
    +
    +create_eq_exit2:
    + ipz_queue_dtor(&eq->ipz_queue);
    +
    +create_eq_exit1:
    + hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
    +
    + EDEB_EX(7, "ret=%lx", ret);
    +
    + return -EINVAL;
    +}
    +
    +void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
    +{
    + unsigned long flags = 0;
    + void *eqe = NULL;
    +
    + EDEB_EN(7, "shca=%p eq=%p", shca, eq);
    + EHCA_CHECK_ADR_P(shca);
    + EHCA_CHECK_EQ_P(eq);
    +
    + spin_lock_irqsave(&eq->spinlock, flags);
    + eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
    + spin_unlock_irqrestore(&eq->spinlock, flags);
    +
    + EDEB_EX(7, "eq=%p eqe=%p", eq, eqe);
    +
    + return eqe;
    +}
    +
    +void ehca_poll_eqs(unsigned long data)
    +{
    + struct ehca_shca *shca;
    + struct ehca_module *module = (struct ehca_module*)data;
    +
    + spin_lock(&module->shca_lock);
    + list_for_each_entry(shca, &module->shca_list, shca_list) {
    + if (shca->eq.is_initialized)
    + ehca_tasklet_eq((unsigned long)(void*)shca);
    + }
    + mod_timer(&module->timer, jiffies + HZ);
    + spin_unlock(&module->shca_lock);
    +
    + return;
    +}
    +
    +int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
    +{
    + unsigned long flags = 0;
    + u64 retcode = H_SUCCESS;
    +
    + EDEB_EN(7, "shca=%p eq=%p", shca, eq);
    + EHCA_CHECK_ADR(shca);
    + EHCA_CHECK_EQ(eq);
    +
    + spin_lock_irqsave(&eq->spinlock, flags);
    + ibmebus_free_irq(NULL, eq->ist, (void *)shca);
    +
    + retcode = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
    +
    + spin_unlock_irqrestore(&eq->spinlock, flags);
    +
    + if (retcode != H_SUCCESS) {
    + EDEB_ERR(4, "Can't free EQ resources.");
    + return -EINVAL;
    + }
    + ipz_queue_dtor(&eq->ipz_queue);
    +
    + EDEB_EX(7, "retcode=%lx", retcode);
    +
    + return 0;
    +}


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