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         if (mlx4_is_mfunc(dev))
  56                 *pdn |= (dev->caps.function + 1) << NOT_MASKED_PD_BITS;
  57         return 0;
  58 }
  59 EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
  60
  61 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
  62 {
  63         mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
  64 }
  65 EXPORT_SYMBOL_GPL(mlx4_pd_free);
  66
  67 int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
  68 {
  69         struct mlx4_priv *priv = mlx4_priv(dev);
  70
  71         *xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
  72         if (*xrcdn == -1)
  73                 return -ENOMEM;
  74
  75         return 0;
  76 }
  77 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
  78
  79 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
  80 {
  81         mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
  82 }
  83 EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
  84
  85 int mlx4_init_pd_table(struct mlx4_dev *dev)
  86 {
  87         struct mlx4_priv *priv = mlx4_priv(dev);
  88
  89         return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
  90                                 (1 << NOT_MASKED_PD_BITS) - 1,
  91                                  dev->caps.reserved_pds, 0);
  92 }
  93
  94 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
  95 {
  96         mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
  97 }
  98
  99 int mlx4_init_xrcd_table(struct mlx4_dev *dev)
 100 {
 101         struct mlx4_priv *priv = mlx4_priv(dev);
 102
 103         return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
 104                                 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
 105 }
 106
 107 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
 108 {
 109         mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
 110 }
 111
 112 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
 113 {
 114         int offset;
 115
 116         uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
 117         if (uar->index == -1)
 118                 return -ENOMEM;
 119
 120         if (mlx4_is_slave(dev))
 121                 offset = uar->index % ((int) pci_resource_len(dev->pdev, 2) /
 122                                        dev->caps.uar_page_size);
 123         else
 124                 offset = uar->index;
 125         uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + offset;
 126         uar->map = NULL;
 127         return 0;
 128 }
 129 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
 130
 131 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
 132 {
 133         mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
 134 }
 135 EXPORT_SYMBOL_GPL(mlx4_uar_free);
 136
 137 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
 138 {
 139         struct mlx4_priv *priv = mlx4_priv(dev);
 140         struct mlx4_uar *uar;
 141         int err = 0;
 142         int idx;
 143
 144         if (!priv->bf_mapping)
 145                 return -ENOMEM;
 146
 147         mutex_lock(&priv->bf_mutex);
 148         if (!list_empty(&priv->bf_list))
 149                 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
 150         else {
 151                 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
 152                         err = -ENOMEM;
 153                         goto out;
 154                 }
 155                 uar = kmalloc(sizeof *uar, GFP_KERNEL);
 156                 if (!uar) {
 157                         err = -ENOMEM;
 158                         goto out;
 159                 }
 160                 err = mlx4_uar_alloc(dev, uar);
 161                 if (err)
 162                         goto free_kmalloc;
 163
 164                 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
 165                 if (!uar->map) {
 166                         err = -ENOMEM;
 167                         goto free_uar;
 168                 }
 169
 170                 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
 171                 if (!uar->bf_map) {
 172                         err = -ENOMEM;
 173                         goto unamp_uar;
 174                 }
 175                 uar->free_bf_bmap = 0;
 176                 list_add(&uar->bf_list, &priv->bf_list);
 177         }
 178
 179         bf->uar = uar;
 180         idx = ffz(uar->free_bf_bmap);
 181         uar->free_bf_bmap |= 1 << idx;
 182         bf->uar = uar;
 183         bf->offset = 0;
 184         bf->buf_size = dev->caps.bf_reg_size / 2;
 185         bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
 186         if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
 187                 list_del_init(&uar->bf_list);
 188
 189         goto out;
 190
 191 unamp_uar:
 192         bf->uar = NULL;
 193         iounmap(uar->map);
 194
 195 free_uar:
 196         mlx4_uar_free(dev, uar);
 197
 198 free_kmalloc:
 199         kfree(uar);
 200
 201 out:
 202         mutex_unlock(&priv->bf_mutex);
 203         return err;
 204 }
 205 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 206
 207 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
 208 {
 209         struct mlx4_priv *priv = mlx4_priv(dev);
 210         int idx;
 211
 212         if (!bf->uar || !bf->uar->bf_map)
 213                 return;
 214
 215         mutex_lock(&priv->bf_mutex);
 216         idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
 217         bf->uar->free_bf_bmap &= ~(1 << idx);
 218         if (!bf->uar->free_bf_bmap) {
 219                 if (!list_empty(&bf->uar->bf_list))
 220                         list_del(&bf->uar->bf_list);
 221
 222                 io_mapping_unmap(bf->uar->bf_map);
 223                 iounmap(bf->uar->map);
 224                 mlx4_uar_free(dev, bf->uar);
 225                 kfree(bf->uar);
 226         } else if (list_empty(&bf->uar->bf_list))
 227                 list_add(&bf->uar->bf_list, &priv->bf_list);
 228
 229         mutex_unlock(&priv->bf_mutex);
 230 }
 231 EXPORT_SYMBOL_GPL(mlx4_bf_free);
 232
 233 int mlx4_init_uar_table(struct mlx4_dev *dev)
 234 {
 235         if (dev->caps.num_uars <= 128) {
 236                 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
 237                          dev->caps.num_uars);
 238                 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
 239                 return -ENODEV;
 240         }
 241
 242         return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
 243                                 dev->caps.num_uars, dev->caps.num_uars - 1,
 244                                 dev->caps.reserved_uars, 0);
 245 }
 246
 247 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 248 {
 249         mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 250 }