drivers/net/mlx4/pd.c

   1 /*
   2  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/errno.h>
  35 #include <linux/io-mapping.h>
  36
  37 #include <asm/page.h>
  38
  39 #include "mlx4.h"
  40 #include "icm.h"
  41
  42 enum {
  43         MLX4_NUM_RESERVED_UARS = 8
  44 };
  45
  46 int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
  47 {
  48         struct mlx4_priv *priv = mlx4_priv(dev);
  49
  50         *pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
  51         if (*pdn == -1)
  52                 return -ENOMEM;
  53
  54         return 0;
  55 }
  56 EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
  57
  58 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
  59 {
  60         mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
  61 }
  62 EXPORT_SYMBOL_GPL(mlx4_pd_free);
  63
  64 int mlx4_init_pd_table(struct mlx4_dev *dev)
  65 {
  66         struct mlx4_priv *priv = mlx4_priv(dev);
  67
  68         return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
  69                                 (1 << 24) - 1, dev->caps.reserved_pds, 0);
  70 }
  71
  72 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
  73 {
  74         mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
  75 }
  76
  77
  78 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
  79 {
  80         uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
  81         if (uar->index == -1)
  82                 return -ENOMEM;
  83
  84         uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index;
  85         uar->map = NULL;
  86
  87         return 0;
  88 }
  89 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
  90
  91 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
  92 {
  93         mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
  94 }
  95 EXPORT_SYMBOL_GPL(mlx4_uar_free);
  96
  97 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
  98 {
  99         struct mlx4_priv *priv = mlx4_priv(dev);
 100         struct mlx4_uar *uar;
 101         int err = 0;
 102         int idx;
 103
 104         if (!priv->bf_mapping)
 105                 return -ENOMEM;
 106
 107         mutex_lock(&priv->bf_mutex);
 108         if (!list_empty(&priv->bf_list))
 109                 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
 110         else {
 111                 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
 112                         err = -ENOMEM;
 113                         goto out;
 114                 }
 115                 uar = kmalloc(sizeof *uar, GFP_KERNEL);
 116                 if (!uar) {
 117                         err = -ENOMEM;
 118                         goto out;
 119                 }
 120                 err = mlx4_uar_alloc(dev, uar);
 121                 if (err)
 122                         goto free_kmalloc;
 123
 124                 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
 125                 if (!uar->map) {
 126                         err = -ENOMEM;
 127                         goto free_uar;
 128                 }
 129
 130                 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
 131                 if (!uar->bf_map) {
 132                         err = -ENOMEM;
 133                         goto unamp_uar;
 134                 }
 135                 uar->free_bf_bmap = 0;
 136                 list_add(&uar->bf_list, &priv->bf_list);
 137         }
 138
 139         bf->uar = uar;
 140         idx = ffz(uar->free_bf_bmap);
 141         uar->free_bf_bmap |= 1 << idx;
 142         bf->uar = uar;
 143         bf->offset = 0;
 144         bf->buf_size = dev->caps.bf_reg_size / 2;
 145         bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
 146         if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
 147                 list_del_init(&uar->bf_list);
 148
 149         goto out;
 150
 151 unamp_uar:
 152         bf->uar = NULL;
 153         iounmap(uar->map);
 154
 155 free_uar:
 156         mlx4_uar_free(dev, uar);
 157
 158 free_kmalloc:
 159         kfree(uar);
 160
 161 out:
 162         mutex_unlock(&priv->bf_mutex);
 163         return err;
 164 }
 165 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 166
 167 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
 168 {
 169         struct mlx4_priv *priv = mlx4_priv(dev);
 170         int idx;
 171
 172         if (!bf->uar || !bf->uar->bf_map)
 173                 return;
 174
 175         mutex_lock(&priv->bf_mutex);
 176         idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
 177         bf->uar->free_bf_bmap &= ~(1 << idx);
 178         if (!bf->uar->free_bf_bmap) {
 179                 if (!list_empty(&bf->uar->bf_list))
 180                         list_del(&bf->uar->bf_list);
 181
 182                 io_mapping_unmap(bf->uar->bf_map);
 183                 iounmap(bf->uar->map);
 184                 mlx4_uar_free(dev, bf->uar);
 185                 kfree(bf->uar);
 186         } else if (list_empty(&bf->uar->bf_list))
 187                 list_add(&bf->uar->bf_list, &priv->bf_list);
 188
 189         mutex_unlock(&priv->bf_mutex);
 190 }
 191 EXPORT_SYMBOL_GPL(mlx4_bf_free);
 192
 193 int mlx4_init_uar_table(struct mlx4_dev *dev)
 194 {
 195         if (dev->caps.num_uars <= 128) {
 196                 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
 197                          dev->caps.num_uars);
 198                 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
 199                 return -ENODEV;
 200         }
 201
 202         return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
 203                                 dev->caps.num_uars, dev->caps.num_uars - 1,
 204                                 max(128, dev->caps.reserved_uars), 0);
 205 }
 206
 207 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 208 {
 209         mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 210 }