ehca_pd.c

Go to the documentation of this file.

/*
 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
 *
 *  PD functions
 *
 *  Authors: Christoph Raisch <[email protected]>
 *
 *  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 <linux/slab.h>

#include "ehca_tools.h"
#include "ehca_iverbs.h"

static struct kmem_cache *pd_cache;

struct ib_pd *ehca_alloc_pd(struct ib_device *device,
                struct ib_ucontext *context, struct ib_udata *udata)
{
    struct ehca_pd *pd;
    int i;

    pd = kmem_cache_zalloc(pd_cache, GFP_KERNEL);
    if (!pd) {
        ehca_err(device, "device=%p context=%p out of memory",
             device, context);
        return ERR_PTR(-ENOMEM);
    }

    for (i = 0; i < 2; i++) {
        INIT_LIST_HEAD(&pd->free[i]);
        INIT_LIST_HEAD(&pd->full[i]);
    }
    mutex_init(&pd->lock);

    /*
     * Kernel PD: when device = -1, 0
     * User   PD: when context != -1
     */
    if (!context) {
        /*
         * Kernel PDs after init reuses always
         * the one created in ehca_shca_reopen()
         */
        struct ehca_shca *shca = container_of(device, struct ehca_shca,
                              ib_device);
        pd->fw_pd.value = shca->pd->fw_pd.value;
    } else
        pd->fw_pd.value = (u64)pd;

    return &pd->ib_pd;
}

int ehca_dealloc_pd(struct ib_pd *pd)
{
    struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
    int i, leftovers = 0;
    struct ipz_small_queue_page *page, *tmp;

    for (i = 0; i < 2; i++) {
        list_splice(&my_pd->full[i], &my_pd->free[i]);
        list_for_each_entry_safe(page, tmp, &my_pd->free[i], list) {
            leftovers = 1;
            free_page(page->page);
            kmem_cache_free(small_qp_cache, page);
        }
    }

    if (leftovers)
        ehca_warn(pd->device,
              "Some small queue pages were not freed");

    kmem_cache_free(pd_cache, my_pd);

    return 0;
}

int ehca_init_pd_cache(void)
{
    pd_cache = kmem_cache_create("ehca_cache_pd",
                     sizeof(struct ehca_pd), 0,
                     SLAB_HWCACHE_ALIGN,
                     NULL);
    if (!pd_cache)
        return -ENOMEM;
    return 0;
}

void ehca_cleanup_pd_cache(void)
{
    if (pd_cache)
        kmem_cache_destroy(pd_cache);
}