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 "ehca_tools.h"
  42#include "ehca_iverbs.h"
  43
  44static struct kmem_cache *pd_cache;
  45
  46struct ib_pd *ehca_alloc_pd(struct ib_device *device,
  47                            struct ib_ucontext *context, struct ib_udata *udata)
  48{
  49        struct ehca_pd *pd;
  50        int i;
  51
  52        pd = kmem_cache_zalloc(pd_cache, GFP_KERNEL);
  53        if (!pd) {
  54                ehca_err(device, "device=%p context=%p out of memory",
  55                         device, context);
  56                return ERR_PTR(-ENOMEM);
  57        }
  58
  59        for (i = 0; i < 2; i++) {
  60                INIT_LIST_HEAD(&pd->free[i]);
  61                INIT_LIST_HEAD(&pd->full[i]);
  62        }
  63        mutex_init(&pd->lock);
  64
  65        /*
  66         * Kernel PD: when device = -1, 0
  67         * User   PD: when context != -1
  68         */
  69        if (!context) {
  70                /*
  71                 * Kernel PDs after init reuses always
  72                 * the one created in ehca_shca_reopen()
  73                 */
  74                struct ehca_shca *shca = container_of(device, struct ehca_shca,
  75                                                      ib_device);
  76                pd->fw_pd.value = shca->pd->fw_pd.value;
  77        } else
  78                pd->fw_pd.value = (u64)pd;
  79
  80        return &pd->ib_pd;
  81}
  82
  83int ehca_dealloc_pd(struct ib_pd *pd)
  84{
  85        struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
  86        int i, leftovers = 0;
  87        struct ipz_small_queue_page *page, *tmp;
  88
  89        for (i = 0; i < 2; i++) {
  90                list_splice(&my_pd->full[i], &my_pd->free[i]);
  91                list_for_each_entry_safe(page, tmp, &my_pd->free[i], list) {
  92                        leftovers = 1;
  93                        free_page(page->page);
  94                        kmem_cache_free(small_qp_cache, page);
  95                }
  96        }
  97
  98        if (leftovers)
  99                ehca_warn(pd->device,
 100                          "Some small queue pages were not freed");
 101
 102        kmem_cache_free(pd_cache, my_pd);
 103
 104        return 0;
 105}
 106
 107int ehca_init_pd_cache(void)
 108{
 109        pd_cache = kmem_cache_create("ehca_cache_pd",
 110                                     sizeof(struct ehca_pd), 0,
 111                                     SLAB_HWCACHE_ALIGN,
 112                                     NULL);
 113        if (!pd_cache)
 114                return -ENOMEM;
 115        return 0;
 116}
 117
 118void ehca_cleanup_pd_cache(void)
 119{
 120        if (pd_cache)
 121                kmem_cache_destroy(pd_cache);
 122}
 123