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, MLX4_USE_RR);
  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
  76 int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
  77 {
  78         u64 out_param;
  79         int err;
  80
  81         if (mlx4_is_mfunc(dev)) {
  82                 err = mlx4_cmd_imm(dev, 0, &out_param,
  83                                    RES_XRCD, RES_OP_RESERVE,
  84                                    MLX4_CMD_ALLOC_RES,
  85                                    MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
  86                 if (err)
  87                         return err;
  88
  89                 *xrcdn = get_param_l(&out_param);
  90                 return 0;
  91         }
  92         return __mlx4_xrcd_alloc(dev, xrcdn);
  93 }
  94 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
  95
  96 void __mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
  97 {
  98         mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn, MLX4_USE_RR);
  99 }
 100
 101 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
 102 {
 103         u64 in_param = 0;
 104         int err;
 105
 106         if (mlx4_is_mfunc(dev)) {
 107                 set_param_l(&in_param, xrcdn);
 108                 err = mlx4_cmd(dev, in_param, RES_XRCD,
 109                                RES_OP_RESERVE, MLX4_CMD_FREE_RES,
 110                                MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
 111                 if (err)
 112                         mlx4_warn(dev, "Failed to release xrcdn %d\n", xrcdn);
 113         } else
 114                 __mlx4_xrcd_free(dev, xrcdn);
 115 }
 116 EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
 117
 118 int mlx4_init_pd_table(struct mlx4_dev *dev)
 119 {
 120         struct mlx4_priv *priv = mlx4_priv(dev);
 121
 122         return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
 123                                 (1 << NOT_MASKED_PD_BITS) - 1,
 124                                  dev->caps.reserved_pds, 0);
 125 }
 126
 127 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
 128 {
 129         mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
 130 }
 131
 132 int mlx4_init_xrcd_table(struct mlx4_dev *dev)
 133 {
 134         struct mlx4_priv *priv = mlx4_priv(dev);
 135
 136         return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
 137                                 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
 138 }
 139
 140 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
 141 {
 142         mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
 143 }
 144
 145 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
 146 {
 147         int offset;
 148
 149         uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
 150         if (uar->index == -1)
 151                 return -ENOMEM;
 152
 153         if (mlx4_is_slave(dev))
 154                 offset = uar->index % ((int)pci_resource_len(dev->persist->pdev,
 155                                                              2) /
 156                                        dev->caps.uar_page_size);
 157         else
 158                 offset = uar->index;
 159         uar->pfn = (pci_resource_start(dev->persist->pdev, 2) >> PAGE_SHIFT)
 160                     + offset;
 161         uar->map = NULL;
 162         return 0;
 163 }
 164 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
 165
 166 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
 167 {
 168         mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index, MLX4_USE_RR);
 169 }
 170 EXPORT_SYMBOL_GPL(mlx4_uar_free);
 171
 172 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf, int node)
 173 {
 174         struct mlx4_priv *priv = mlx4_priv(dev);
 175         struct mlx4_uar *uar;
 176         int err = 0;
 177         int idx;
 178
 179         if (!priv->bf_mapping)
 180                 return -ENOMEM;
 181
 182         mutex_lock(&priv->bf_mutex);
 183         if (!list_empty(&priv->bf_list))
 184                 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
 185         else {
 186                 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
 187                         err = -ENOMEM;
 188                         goto out;
 189                 }
 190                 uar = kmalloc_node(sizeof(*uar), GFP_KERNEL, node);
 191                 if (!uar) {
 192                         uar = kmalloc(sizeof(*uar), GFP_KERNEL);
 193                         if (!uar) {
 194                                 err = -ENOMEM;
 195                                 goto out;
 196                         }
 197                 }
 198                 err = mlx4_uar_alloc(dev, uar);
 199                 if (err)
 200                         goto free_kmalloc;
 201
 202                 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
 203                 if (!uar->map) {
 204                         err = -ENOMEM;
 205                         goto free_uar;
 206                 }
 207
 208                 uar->bf_map = io_mapping_map_wc(priv->bf_mapping,
 209                                                 uar->index << PAGE_SHIFT,
 210                                                 PAGE_SIZE);
 211                 if (!uar->bf_map) {
 212                         err = -ENOMEM;
 213                         goto unamp_uar;
 214                 }
 215                 uar->free_bf_bmap = 0;
 216                 list_add(&uar->bf_list, &priv->bf_list);
 217         }
 218
 219         idx = ffz(uar->free_bf_bmap);
 220         uar->free_bf_bmap |= 1 << idx;
 221         bf->uar = uar;
 222         bf->offset = 0;
 223         bf->buf_size = dev->caps.bf_reg_size / 2;
 224         bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
 225         if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
 226                 list_del_init(&uar->bf_list);
 227
 228         goto out;
 229
 230 unamp_uar:
 231         bf->uar = NULL;
 232         iounmap(uar->map);
 233
 234 free_uar:
 235         mlx4_uar_free(dev, uar);
 236
 237 free_kmalloc:
 238         kfree(uar);
 239
 240 out:
 241         mutex_unlock(&priv->bf_mutex);
 242         return err;
 243 }
 244 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 245
 246 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
 247 {
 248         struct mlx4_priv *priv = mlx4_priv(dev);
 249         int idx;
 250
 251         if (!bf->uar || !bf->uar->bf_map)
 252                 return;
 253
 254         mutex_lock(&priv->bf_mutex);
 255         idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
 256         bf->uar->free_bf_bmap &= ~(1 << idx);
 257         if (!bf->uar->free_bf_bmap) {
 258                 if (!list_empty(&bf->uar->bf_list))
 259                         list_del(&bf->uar->bf_list);
 260
 261                 io_mapping_unmap(bf->uar->bf_map);
 262                 iounmap(bf->uar->map);
 263                 mlx4_uar_free(dev, bf->uar);
 264                 kfree(bf->uar);
 265         } else if (list_empty(&bf->uar->bf_list))
 266                 list_add(&bf->uar->bf_list, &priv->bf_list);
 267
 268         mutex_unlock(&priv->bf_mutex);
 269 }
 270 EXPORT_SYMBOL_GPL(mlx4_bf_free);
 271
 272 int mlx4_init_uar_table(struct mlx4_dev *dev)
 273 {
 274         int num_reserved_uar = mlx4_get_num_reserved_uar(dev);
 275
 276         mlx4_dbg(dev, "uar_page_shift = %d", dev->uar_page_shift);
 277         mlx4_dbg(dev, "Effective reserved_uars=%d", dev->caps.reserved_uars);
 278
 279         if (dev->caps.num_uars <= num_reserved_uar) {
 280                 mlx4_err(
 281                         dev, "Only %d UAR pages (need more than %d)\n",
 282                         dev->caps.num_uars, num_reserved_uar);
 283                 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
 284                 return -ENODEV;
 285         }
 286
 287         return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
 288                                 dev->caps.num_uars, dev->caps.num_uars - 1,
 289                                 dev->caps.reserved_uars, 0);
 290 }
 291
 292 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 293 {
 294         mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 295 }