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
  53         pd = kmem_cache_zalloc(pd_cache, GFP_KERNEL);
  54         if (!pd) {
  55                 ehca_err(device, "device=%p context=%p out of memory",
  56                          device, context);
  57                 return ERR_PTR(-ENOMEM);
  58         }
  59
  60         pd->ownpid = current->tgid;
  61
  62         /*
  63          * Kernel PD: when device = -1, 0
  64          * User   PD: when context != -1
  65          */
  66         if (!context) {
  67                 /*
  68                  * Kernel PDs after init reuses always
  69                  * the one created in ehca_shca_reopen()
  70                  */
  71                 struct ehca_shca *shca = container_of(device, struct ehca_shca,
  72                                                       ib_device);
  73                 pd->fw_pd.value = shca->pd->fw_pd.value;
  74         } else
  75                 pd->fw_pd.value = (u64)pd;
  76
  77         return &pd->ib_pd;
  78 }
  79
  80 int ehca_dealloc_pd(struct ib_pd *pd)
  81 {
  82         u32 cur_pid = current->tgid;
  83         struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
  84
  85         if (my_pd->ib_pd.uobject && my_pd->ib_pd.uobject->context &&
  86             my_pd->ownpid != cur_pid) {
  87                 ehca_err(pd->device, "Invalid caller pid=%x ownpid=%x",
  88                          cur_pid, my_pd->ownpid);
  89                 return -EINVAL;
  90         }
  91
  92         kmem_cache_free(pd_cache,
  93                         container_of(pd, struct ehca_pd, ib_pd));
  94
  95         return 0;
  96 }
  97
  98 int ehca_init_pd_cache(void)
  99 {
 100         pd_cache = kmem_cache_create("ehca_cache_pd",
 101                                      sizeof(struct ehca_pd), 0,
 102                                      SLAB_HWCACHE_ALIGN,
 103                                      NULL, NULL);
 104         if (!pd_cache)
 105                 return -ENOMEM;
 106         return 0;
 107 }
 108
 109 void ehca_cleanup_pd_cache(void)
 110 {
 111         if (pd_cache)
 112                 kmem_cache_destroy(pd_cache);
 113 }