LXR linux/drivers/infiniband/hw/ehca/ehca

   1/*
   2 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3 *
   4 *  PD functions
   5 *
   6 *  Authors: Christoph Raisch <raisch@de.ibm.com>
   7 *
   8 *  Copyright (c) 2005 IBM Corporation
   9 *
  10 *  All rights reserved.
  11 *
  12 *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  13 *  BSD.
  14 *
  15 * OpenIB BSD License
  16 *
  17 * Redistribution and use in source and binary forms, with or without
  18 * modification, are permitted provided that the following conditions are met:
  19 *
  20 * Redistributions of source code must retain the above copyright notice, this
  21 * list of conditions and the following disclaimer.
  22 *
  23 * Redistributions in binary form must reproduce the above copyright notice,
  24 * this list of conditions and the following disclaimer in the documentation
  25 * and/or other materials
  26 * provided with the distribution.
  27 *
  28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  29 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  32 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  35 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  36 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 * POSSIBILITY OF SUCH DAMAGE.
  39 */
  40
  41#include <linux/slab.h>
  42
  43#include "ehca_tools.h"
  44#include "ehca_iverbs.h"
  45
  46static struct kmem_cache *pd_cache;
  47
  48struct ib_pd *ehca_alloc_pd(struct ib_device *device,
  49                            struct ib_ucontext *context, struct ib_udata *udata)
  50{
  51        struct ehca_pd *pd;
  52        int i;
  53
  54        pd = kmem_cache_zalloc(pd_cache, GFP_KERNEL);
  55        if (!pd) {
  56                ehca_err(device, "device=%p context=%p out of memory",
  57                         device, context);
  58                return ERR_PTR(-ENOMEM);
  59        }
  60
  61        for (i = 0; i < 2; i++) {
  62                INIT_LIST_HEAD(&pd->free[i]);
  63                INIT_LIST_HEAD(&pd->full[i]);
  64        }
  65        mutex_init(&pd->lock);
  66
  67        /*
  68         * Kernel PD: when device = -1, 0
  69         * User   PD: when context != -1
  70         */
  71        if (!context) {
  72                /*
  73                 * Kernel PDs after init reuses always
  74                 * the one created in ehca_shca_reopen()
  75                 */
  76                struct ehca_shca *shca = container_of(device, struct ehca_shca,
  77                                                      ib_device);
  78                pd->fw_pd.value = shca->pd->fw_pd.value;
  79        } else
  80                pd->fw_pd.value = (u64)pd;
  81
  82        return &pd->ib_pd;
  83}
  84
  85int ehca_dealloc_pd(struct ib_pd *pd)
  86{
  87        struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
  88        int i, leftovers = 0;
  89        struct ipz_small_queue_page *page, *tmp;
  90
  91        for (i = 0; i < 2; i++) {
  92                list_splice(&my_pd->full[i], &my_pd->free[i]);
  93                list_for_each_entry_safe(page, tmp, &my_pd->free[i], list) {
  94                        leftovers = 1;
  95                        free_page(page->page);
  96                        kmem_cache_free(small_qp_cache, page);
  97                }
  98        }
  99
 100        if (leftovers)
 101                ehca_warn(pd->device,
 102                          "Some small queue pages were not freed");
 103
 104        kmem_cache_free(pd_cache, my_pd);
 105
 106        return 0;
 107}
 108
 109int ehca_init_pd_cache(void)
 110{
 111        pd_cache = kmem_cache_create("ehca_cache_pd",
 112                                     sizeof(struct ehca_pd), 0,
 113                                     SLAB_HWCACHE_ALIGN,
 114                                     NULL);
 115        if (!pd_cache)
 116                return -ENOMEM;
 117        return 0;
 118}
 119
 120void ehca_cleanup_pd_cache(void)
 121{
 122        if (pd_cache)
 123                kmem_cache_destroy(pd_cache);
 124}
 125