drivers/infiniband/hw/ehca/ehca_pd.c

   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 <asm/current.h>
  42
  43 #include "ehca_tools.h"
  44 #include "ehca_iverbs.h"
  45
  46 static struct kmem_cache *pd_cache;
  47
  48 struct 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         pd->ownpid = current->tgid;
  62         for (i = 0; i < 2; i++) {
  63                 INIT_LIST_HEAD(&pd->free[i]);
  64                 INIT_LIST_HEAD(&pd->full[i]);
  65         }
  66         mutex_init(&pd->lock);
  67
  68         /*
  69          * Kernel PD: when device = -1, 0
  70          * User   PD: when context != -1
  71          */
  72         if (!context) {
  73                 /*
  74                  * Kernel PDs after init reuses always
  75                  * the one created in ehca_shca_reopen()
  76                  */
  77                 struct ehca_shca *shca = container_of(device, struct ehca_shca,
  78                                                       ib_device);
  79                 pd->fw_pd.value = shca->pd->fw_pd.value;
  80         } else
  81                 pd->fw_pd.value = (u64)pd;
  82
  83         return &pd->ib_pd;
  84 }
  85
  86 int ehca_dealloc_pd(struct ib_pd *pd)
  87 {
  88         u32 cur_pid = current->tgid;
  89         struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
  90         int i, leftovers = 0;
  91         struct ipz_small_queue_page *page, *tmp;
  92
  93         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
  94             my_pd->ownpid != cur_pid) {
  95                 ehca_err(pd->device, "Invalid caller pid=%x ownpid=%x",
  96                          cur_pid, my_pd->ownpid);
  97                 return -EINVAL;
  98         }
  99
 100         for (i = 0; i < 2; i++) {
 101                 list_splice(&my_pd->full[i], &my_pd->free[i]);
 102                 list_for_each_entry_safe(page, tmp, &my_pd->free[i], list) {
 103                         leftovers = 1;
 104                         free_page(page->page);
 105                         kmem_cache_free(small_qp_cache, page);
 106                 }
 107         }
 108
 109         if (leftovers)
 110                 ehca_warn(pd->device,
 111                           "Some small queue pages were not freed");
 112
 113         kmem_cache_free(pd_cache, my_pd);
 114
 115         return 0;
 116 }
 117
 118 int ehca_init_pd_cache(void)
 119 {
 120         pd_cache = kmem_cache_create("ehca_cache_pd",
 121                                      sizeof(struct ehca_pd), 0,
 122                                      SLAB_HWCACHE_ALIGN,
 123                                      NULL);
 124         if (!pd_cache)
 125                 return -ENOMEM;
 126         return 0;
 127 }
 128
 129 void ehca_cleanup_pd_cache(void)
 130 {
 131         if (pd_cache)
 132                 kmem_cache_destroy(pd_cache);
 133 }