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_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
  66 {
  67         struct mlx4_priv *priv = mlx4_priv(dev);
  68
  69         *xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
  70         if (*xrcdn == -1)
  71                 return -ENOMEM;
  72
  73         return 0;
  74 }
  75 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
  76
  77 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
  78 {
  79         mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
  80 }
  81 EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
  82
  83 int mlx4_init_pd_table(struct mlx4_dev *dev)
  84 {
  85         struct mlx4_priv *priv = mlx4_priv(dev);
  86
  87         return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
  88                                 (1 << 24) - 1, dev->caps.reserved_pds, 0);
  89 }
  90
  91 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
  92 {
  93         mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
  94 }
  95
  96 int mlx4_init_xrcd_table(struct mlx4_dev *dev)
  97 {
  98         struct mlx4_priv *priv = mlx4_priv(dev);
  99
 100         return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
 101                                 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
 102 }
 103
 104 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
 105 {
 106         mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
 107 }
 108
 109 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
 110 {
 111         uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
 112         if (uar->index == -1)
 113                 return -ENOMEM;
 114
 115         uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index;
 116         uar->map = NULL;
 117
 118         return 0;
 119 }
 120 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
 121
 122 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
 123 {
 124         mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
 125 }
 126 EXPORT_SYMBOL_GPL(mlx4_uar_free);
 127
 128 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
 129 {
 130         struct mlx4_priv *priv = mlx4_priv(dev);
 131         struct mlx4_uar *uar;
 132         int err = 0;
 133         int idx;
 134
 135         if (!priv->bf_mapping)
 136                 return -ENOMEM;
 137
 138         mutex_lock(&priv->bf_mutex);
 139         if (!list_empty(&priv->bf_list))
 140                 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
 141         else {
 142                 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
 143                         err = -ENOMEM;
 144                         goto out;
 145                 }
 146                 uar = kmalloc(sizeof *uar, GFP_KERNEL);
 147                 if (!uar) {
 148                         err = -ENOMEM;
 149                         goto out;
 150                 }
 151                 err = mlx4_uar_alloc(dev, uar);
 152                 if (err)
 153                         goto free_kmalloc;
 154
 155                 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
 156                 if (!uar->map) {
 157                         err = -ENOMEM;
 158                         goto free_uar;
 159                 }
 160
 161                 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
 162                 if (!uar->bf_map) {
 163                         err = -ENOMEM;
 164                         goto unamp_uar;
 165                 }
 166                 uar->free_bf_bmap = 0;
 167                 list_add(&uar->bf_list, &priv->bf_list);
 168         }
 169
 170         bf->uar = uar;
 171         idx = ffz(uar->free_bf_bmap);
 172         uar->free_bf_bmap |= 1 << idx;
 173         bf->uar = uar;
 174         bf->offset = 0;
 175         bf->buf_size = dev->caps.bf_reg_size / 2;
 176         bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
 177         if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
 178                 list_del_init(&uar->bf_list);
 179
 180         goto out;
 181
 182 unamp_uar:
 183         bf->uar = NULL;
 184         iounmap(uar->map);
 185
 186 free_uar:
 187         mlx4_uar_free(dev, uar);
 188
 189 free_kmalloc:
 190         kfree(uar);
 191
 192 out:
 193         mutex_unlock(&priv->bf_mutex);
 194         return err;
 195 }
 196 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 197
 198 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
 199 {
 200         struct mlx4_priv *priv = mlx4_priv(dev);
 201         int idx;
 202
 203         if (!bf->uar || !bf->uar->bf_map)
 204                 return;
 205
 206         mutex_lock(&priv->bf_mutex);
 207         idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
 208         bf->uar->free_bf_bmap &= ~(1 << idx);
 209         if (!bf->uar->free_bf_bmap) {
 210                 if (!list_empty(&bf->uar->bf_list))
 211                         list_del(&bf->uar->bf_list);
 212
 213                 io_mapping_unmap(bf->uar->bf_map);
 214                 iounmap(bf->uar->map);
 215                 mlx4_uar_free(dev, bf->uar);
 216                 kfree(bf->uar);
 217         } else if (list_empty(&bf->uar->bf_list))
 218                 list_add(&bf->uar->bf_list, &priv->bf_list);
 219
 220         mutex_unlock(&priv->bf_mutex);
 221 }
 222 EXPORT_SYMBOL_GPL(mlx4_bf_free);
 223
 224 int mlx4_init_uar_table(struct mlx4_dev *dev)
 225 {
 226         if (dev->caps.num_uars <= 128) {
 227                 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
 228                          dev->caps.num_uars);
 229                 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
 230                 return -ENODEV;
 231         }
 232
 233         return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
 234                                 dev->caps.num_uars, dev->caps.num_uars - 1,
 235                                 max(128, dev->caps.reserved_uars), 0);
 236 }
 237
 238 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 239 {
 240         mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 241 }