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ehca_eq.c

/*
 *  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.
 */

#include "ehca_classes.h"
#include "ehca_irq.h"
#include "ehca_iverbs.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;
      u32 nr_pages;
      u32 i;
      void *vpage;
      struct ib_device *ib_dev = &shca->ib_device;

      spin_lock_init(&eq->spinlock);
      spin_lock_init(&eq->irq_spinlock);
      eq->is_initialized = 0;

      if (type != EHCA_EQ && type != EHCA_NEQ) {
            ehca_err(ib_dev, "Invalid EQ type %x. eq=%p", type, eq);
            return -EINVAL;
      }
      if (!length) {
            ehca_err(ib_dev, "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) {
            ehca_err(ib_dev, "Can't allocate EQ/NEQ. eq=%p", eq);
            return -EINVAL;
      }

      ret = ipz_queue_ctor(NULL, &eq->ipz_queue, nr_pages,
                       EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0, 0);
      if (!ret) {
            ehca_err(ib_dev, "Can't allocate EQ pages eq=%p", eq);
            goto create_eq_exit1;
      }

      for (i = 0; i < nr_pages; i++) {
            u64 rpage;

            vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
            if (!vpage) {
                  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)
                        goto create_eq_exit2;
            } else {
                  if (ret != H_PAGE_REGISTERED || !vpage)
                        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(eq->ist, ehca_interrupt_eq,
                                IRQF_DISABLED, "ehca_eq",
                                (void *)shca);
            if (ret < 0)
                  ehca_err(ib_dev, "Can't map interrupt handler.");

            tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
      } else if (type == EHCA_NEQ) {
            ret = ibmebus_request_irq(eq->ist, ehca_interrupt_neq,
                                IRQF_DISABLED, "ehca_neq",
                                (void *)shca);
            if (ret < 0)
                  ehca_err(ib_dev, "Can't map interrupt handler.");

            tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
      }

      eq->is_initialized = 1;

      return 0;

create_eq_exit2:
      ipz_queue_dtor(NULL, &eq->ipz_queue);

create_eq_exit1:
      hipz_h_destroy_eq(shca->ipz_hca_handle, eq);

      return -EINVAL;
}

void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
{
      unsigned long flags;
      void *eqe;

      spin_lock_irqsave(&eq->spinlock, flags);
      eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
      spin_unlock_irqrestore(&eq->spinlock, flags);

      return eqe;
}

int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
{
      unsigned long flags;
      u64 h_ret;

      spin_lock_irqsave(&eq->spinlock, flags);
      ibmebus_free_irq(eq->ist, (void *)shca);

      h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);

      spin_unlock_irqrestore(&eq->spinlock, flags);

      if (h_ret != H_SUCCESS) {
            ehca_err(&shca->ib_device, "Can't free EQ resources.");
            return -EINVAL;
      }
      ipz_queue_dtor(NULL, &eq->ipz_queue);

      return 0;
}

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