drivers/net/ethernet/mellanox/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/export.h>
  36 #include <linux/io-mapping.h>
  37
  38 #include <asm/page.h>
  39
  40 #include "mlx4.h"
  41 #include "icm.h"
  42
  43 enum {
  44         MLX4_NUM_RESERVED_UARS = 8
  45 };
  46
  47 int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
  48 {
  49         struct mlx4_priv *priv = mlx4_priv(dev);
  50
  51         *pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
  52         if (*pdn == -1)
  53                 return -ENOMEM;
  54
  55         return 0;
  56 }
  57 EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
  58
  59 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
  60 {
  61         mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
  62 }
  63 EXPORT_SYMBOL_GPL(mlx4_pd_free);
  64
  65 int mlx4_init_pd_table(struct mlx4_dev *dev)
  66 {
  67         struct mlx4_priv *priv = mlx4_priv(dev);
  68
  69         return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
  70                                 (1 << 24) - 1, dev->caps.reserved_pds, 0);
  71 }
  72
  73 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
  74 {
  75         mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
  76 }
  77
  78
  79 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
  80 {
  81         uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
  82         if (uar->index == -1)
  83                 return -ENOMEM;
  84
  85         uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index;
  86         uar->map = NULL;
  87
  88         return 0;
  89 }
  90 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
  91
  92 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
  93 {
  94         mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
  95 }
  96 EXPORT_SYMBOL_GPL(mlx4_uar_free);
  97
  98 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
  99 {
 100         struct mlx4_priv *priv = mlx4_priv(dev);
 101         struct mlx4_uar *uar;
 102         int err = 0;
 103         int idx;
 104
 105         if (!priv->bf_mapping)
 106                 return -ENOMEM;
 107
 108         mutex_lock(&priv->bf_mutex);
 109         if (!list_empty(&priv->bf_list))
 110                 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
 111         else {
 112                 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
 113                         err = -ENOMEM;
 114                         goto out;
 115                 }
 116                 uar = kmalloc(sizeof *uar, GFP_KERNEL);
 117                 if (!uar) {
 118                         err = -ENOMEM;
 119                         goto out;
 120                 }
 121                 err = mlx4_uar_alloc(dev, uar);
 122                 if (err)
 123                         goto free_kmalloc;
 124
 125                 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
 126                 if (!uar->map) {
 127                         err = -ENOMEM;
 128                         goto free_uar;
 129                 }
 130
 131                 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
 132                 if (!uar->bf_map) {
 133                         err = -ENOMEM;
 134                         goto unamp_uar;
 135                 }
 136                 uar->free_bf_bmap = 0;
 137                 list_add(&uar->bf_list, &priv->bf_list);
 138         }
 139
 140         bf->uar = uar;
 141         idx = ffz(uar->free_bf_bmap);
 142         uar->free_bf_bmap |= 1 << idx;
 143         bf->uar = uar;
 144         bf->offset = 0;
 145         bf->buf_size = dev->caps.bf_reg_size / 2;
 146         bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
 147         if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
 148                 list_del_init(&uar->bf_list);
 149
 150         goto out;
 151
 152 unamp_uar:
 153         bf->uar = NULL;
 154         iounmap(uar->map);
 155
 156 free_uar:
 157         mlx4_uar_free(dev, uar);
 158
 159 free_kmalloc:
 160         kfree(uar);
 161
 162 out:
 163         mutex_unlock(&priv->bf_mutex);
 164         return err;
 165 }
 166 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 167
 168 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
 169 {
 170         struct mlx4_priv *priv = mlx4_priv(dev);
 171         int idx;
 172
 173         if (!bf->uar || !bf->uar->bf_map)
 174                 return;
 175
 176         mutex_lock(&priv->bf_mutex);
 177         idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
 178         bf->uar->free_bf_bmap &= ~(1 << idx);
 179         if (!bf->uar->free_bf_bmap) {
 180                 if (!list_empty(&bf->uar->bf_list))
 181                         list_del(&bf->uar->bf_list);
 182
 183                 io_mapping_unmap(bf->uar->bf_map);
 184                 iounmap(bf->uar->map);
 185                 mlx4_uar_free(dev, bf->uar);
 186                 kfree(bf->uar);
 187         } else if (list_empty(&bf->uar->bf_list))
 188                 list_add(&bf->uar->bf_list, &priv->bf_list);
 189
 190         mutex_unlock(&priv->bf_mutex);
 191 }
 192 EXPORT_SYMBOL_GPL(mlx4_bf_free);
 193
 194 int mlx4_init_uar_table(struct mlx4_dev *dev)
 195 {
 196         if (dev->caps.num_uars <= 128) {
 197                 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
 198                          dev->caps.num_uars);
 199                 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
 200                 return -ENODEV;
 201         }
 202
 203         return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
 204                                 dev->caps.num_uars, dev->caps.num_uars - 1,
 205                                 max(128, dev->caps.reserved_uars), 0);
 206 }
 207
 208 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 209 {
 210         mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 211 }