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/init.h>
  35 #include <linux/errno.h>
  36 #include <linux/export.h>
  37 #include <linux/io-mapping.h>
  38
  39 #include <asm/page.h>
  40
  41 #include "mlx4.h"
  42 #include "icm.h"
  43
  44 enum {
  45         MLX4_NUM_RESERVED_UARS = 8
  46 };
  47
  48 int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
  49 {
  50         struct mlx4_priv *priv = mlx4_priv(dev);
  51
  52         *pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
  53         if (*pdn == -1)
  54                 return -ENOMEM;
  55
  56         return 0;
  57 }
  58 EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
  59
  60 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
  61 {
  62         mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
  63 }
  64 EXPORT_SYMBOL_GPL(mlx4_pd_free);
  65
  66 int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
  67 {
  68         struct mlx4_priv *priv = mlx4_priv(dev);
  69
  70         *xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
  71         if (*xrcdn == -1)
  72                 return -ENOMEM;
  73
  74         return 0;
  75 }
  76 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
  77
  78 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
  79 {
  80         mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
  81 }
  82 EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
  83
  84 int mlx4_init_pd_table(struct mlx4_dev *dev)
  85 {
  86         struct mlx4_priv *priv = mlx4_priv(dev);
  87
  88         return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
  89                                 (1 << NOT_MASKED_PD_BITS) - 1,
  90                                  dev->caps.reserved_pds, 0);
  91 }
  92
  93 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
  94 {
  95         mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
  96 }
  97
  98 int mlx4_init_xrcd_table(struct mlx4_dev *dev)
  99 {
 100         struct mlx4_priv *priv = mlx4_priv(dev);
 101
 102         return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
 103                                 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
 104 }
 105
 106 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
 107 {
 108         mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
 109 }
 110
 111 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
 112 {
 113         int offset;
 114
 115         uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
 116         if (uar->index == -1)
 117                 return -ENOMEM;
 118
 119         if (mlx4_is_slave(dev))
 120                 offset = uar->index % ((int) pci_resource_len(dev->pdev, 2) /
 121                                        dev->caps.uar_page_size);
 122         else
 123                 offset = uar->index;
 124         uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + offset;
 125         uar->map = NULL;
 126         return 0;
 127 }
 128 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
 129
 130 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
 131 {
 132         mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
 133 }
 134 EXPORT_SYMBOL_GPL(mlx4_uar_free);
 135
 136 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
 137 {
 138         struct mlx4_priv *priv = mlx4_priv(dev);
 139         struct mlx4_uar *uar;
 140         int err = 0;
 141         int idx;
 142
 143         if (!priv->bf_mapping)
 144                 return -ENOMEM;
 145
 146         mutex_lock(&priv->bf_mutex);
 147         if (!list_empty(&priv->bf_list))
 148                 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
 149         else {
 150                 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
 151                         err = -ENOMEM;
 152                         goto out;
 153                 }
 154                 uar = kmalloc(sizeof *uar, GFP_KERNEL);
 155                 if (!uar) {
 156                         err = -ENOMEM;
 157                         goto out;
 158                 }
 159                 err = mlx4_uar_alloc(dev, uar);
 160                 if (err)
 161                         goto free_kmalloc;
 162
 163                 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
 164                 if (!uar->map) {
 165                         err = -ENOMEM;
 166                         goto free_uar;
 167                 }
 168
 169                 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
 170                 if (!uar->bf_map) {
 171                         err = -ENOMEM;
 172                         goto unamp_uar;
 173                 }
 174                 uar->free_bf_bmap = 0;
 175                 list_add(&uar->bf_list, &priv->bf_list);
 176         }
 177
 178         bf->uar = uar;
 179         idx = ffz(uar->free_bf_bmap);
 180         uar->free_bf_bmap |= 1 << idx;
 181         bf->uar = uar;
 182         bf->offset = 0;
 183         bf->buf_size = dev->caps.bf_reg_size / 2;
 184         bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
 185         if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
 186                 list_del_init(&uar->bf_list);
 187
 188         goto out;
 189
 190 unamp_uar:
 191         bf->uar = NULL;
 192         iounmap(uar->map);
 193
 194 free_uar:
 195         mlx4_uar_free(dev, uar);
 196
 197 free_kmalloc:
 198         kfree(uar);
 199
 200 out:
 201         mutex_unlock(&priv->bf_mutex);
 202         return err;
 203 }
 204 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 205
 206 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
 207 {
 208         struct mlx4_priv *priv = mlx4_priv(dev);
 209         int idx;
 210
 211         if (!bf->uar || !bf->uar->bf_map)
 212                 return;
 213
 214         mutex_lock(&priv->bf_mutex);
 215         idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
 216         bf->uar->free_bf_bmap &= ~(1 << idx);
 217         if (!bf->uar->free_bf_bmap) {
 218                 if (!list_empty(&bf->uar->bf_list))
 219                         list_del(&bf->uar->bf_list);
 220
 221                 io_mapping_unmap(bf->uar->bf_map);
 222                 iounmap(bf->uar->map);
 223                 mlx4_uar_free(dev, bf->uar);
 224                 kfree(bf->uar);
 225         } else if (list_empty(&bf->uar->bf_list))
 226                 list_add(&bf->uar->bf_list, &priv->bf_list);
 227
 228         mutex_unlock(&priv->bf_mutex);
 229 }
 230 EXPORT_SYMBOL_GPL(mlx4_bf_free);
 231
 232 int mlx4_init_uar_table(struct mlx4_dev *dev)
 233 {
 234         if (dev->caps.num_uars <= 128) {
 235                 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
 236                          dev->caps.num_uars);
 237                 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
 238                 return -ENODEV;
 239         }
 240
 241         return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
 242                                 dev->caps.num_uars, dev->caps.num_uars - 1,
 243                                 dev->caps.reserved_uars, 0);
 244 }
 245
 246 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 247 {
 248         mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 249 }