LXR linux/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
  43enum {
  44        MLX4_NUM_RESERVED_UARS = 8
  45};
  46
  47int 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}
  57EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
  58
  59void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
  60{
  61        mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn, MLX4_USE_RR);
  62}
  63EXPORT_SYMBOL_GPL(mlx4_pd_free);
  64
  65int __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
  76int 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}
  94EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
  95
  96void __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
 101void 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}
 116EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
 117
 118int 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
 127void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
 128{
 129        mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
 130}
 131
 132int 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
 140void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
 141{
 142        mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
 143}
 144
 145int 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}
 164EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
 165
 166void 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}
 170EXPORT_SYMBOL_GPL(mlx4_uar_free);
 171
 172int 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
 230unamp_uar:
 231        bf->uar = NULL;
 232        iounmap(uar->map);
 233
 234free_uar:
 235        mlx4_uar_free(dev, uar);
 236
 237free_kmalloc:
 238        kfree(uar);
 239
 240out:
 241        mutex_unlock(&priv->bf_mutex);
 242        return err;
 243}
 244EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
 245
 246void 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}
 270EXPORT_SYMBOL_GPL(mlx4_bf_free);
 271
 272int 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
 292void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
 293{
 294        mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
 295}
 296