pd.c

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/*
 * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/io-mapping.h>

#include <asm/page.h>

#include "mlx4.h"
#include "icm.h"

enum {
    MLX4_NUM_RESERVED_UARS = 8
};

int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
{
    struct mlx4_priv *priv = mlx4_priv(dev);

    *pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
    if (*pdn == -1)
        return -ENOMEM;

    return 0;
}
EXPORT_SYMBOL_GPL(mlx4_pd_alloc);

void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
{
    mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
}
EXPORT_SYMBOL_GPL(mlx4_pd_free);

int __mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
{
    struct mlx4_priv *priv = mlx4_priv(dev);

    *xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
    if (*xrcdn == -1)
        return -ENOMEM;

    return 0;
}

int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
{
    u64 out_param;
    int err;

    if (mlx4_is_mfunc(dev)) {
        err = mlx4_cmd_imm(dev, 0, &out_param,
                   RES_XRCD, RES_OP_RESERVE,
                   MLX4_CMD_ALLOC_RES,
                   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
        if (err)
            return err;

        *xrcdn = get_param_l(&out_param);
        return 0;
    }
    return __mlx4_xrcd_alloc(dev, xrcdn);
}
EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);

void __mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
{
    mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
}

void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
{
    u64 in_param;
    int err;

    if (mlx4_is_mfunc(dev)) {
        set_param_l(&in_param, xrcdn);
        err = mlx4_cmd(dev, in_param, RES_XRCD,
                   RES_OP_RESERVE, MLX4_CMD_FREE_RES,
                   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
        if (err)
            mlx4_warn(dev, "Failed to release xrcdn %d\n", xrcdn);
    } else
        __mlx4_xrcd_free(dev, xrcdn);
}
EXPORT_SYMBOL_GPL(mlx4_xrcd_free);

int mlx4_init_pd_table(struct mlx4_dev *dev)
{
    struct mlx4_priv *priv = mlx4_priv(dev);

    return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
                (1 << NOT_MASKED_PD_BITS) - 1,
                 dev->caps.reserved_pds, 0);
}

void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
{
    mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
}

int mlx4_init_xrcd_table(struct mlx4_dev *dev)
{
    struct mlx4_priv *priv = mlx4_priv(dev);

    return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
                (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
}

void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
{
    mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
}

int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
{
    int offset;

    uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
    if (uar->index == -1)
        return -ENOMEM;

    if (mlx4_is_slave(dev))
        offset = uar->index % ((int) pci_resource_len(dev->pdev, 2) /
                       dev->caps.uar_page_size);
    else
        offset = uar->index;
    uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + offset;
    uar->map = NULL;
    return 0;
}
EXPORT_SYMBOL_GPL(mlx4_uar_alloc);

void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
{
    mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
}
EXPORT_SYMBOL_GPL(mlx4_uar_free);

int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
{
    struct mlx4_priv *priv = mlx4_priv(dev);
    struct mlx4_uar *uar;
    int err = 0;
    int idx;

    if (!priv->bf_mapping)
        return -ENOMEM;

    mutex_lock(&priv->bf_mutex);
    if (!list_empty(&priv->bf_list))
        uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
    else {
        if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
            err = -ENOMEM;
            goto out;
        }
        uar = kmalloc(sizeof *uar, GFP_KERNEL);
        if (!uar) {
            err = -ENOMEM;
            goto out;
        }
        err = mlx4_uar_alloc(dev, uar);
        if (err)
            goto free_kmalloc;

        uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
        if (!uar->map) {
            err = -ENOMEM;
            goto free_uar;
        }

        uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
        if (!uar->bf_map) {
            err = -ENOMEM;
            goto unamp_uar;
        }
        uar->free_bf_bmap = 0;
        list_add(&uar->bf_list, &priv->bf_list);
    }

    bf->uar = uar;
    idx = ffz(uar->free_bf_bmap);
    uar->free_bf_bmap |= 1 << idx;
    bf->uar = uar;
    bf->offset = 0;
    bf->buf_size = dev->caps.bf_reg_size / 2;
    bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
    if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
        list_del_init(&uar->bf_list);

    goto out;

unamp_uar:
    bf->uar = NULL;
    iounmap(uar->map);

free_uar:
    mlx4_uar_free(dev, uar);

free_kmalloc:
    kfree(uar);

out:
    mutex_unlock(&priv->bf_mutex);
    return err;
}
EXPORT_SYMBOL_GPL(mlx4_bf_alloc);

void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
{
    struct mlx4_priv *priv = mlx4_priv(dev);
    int idx;

    if (!bf->uar || !bf->uar->bf_map)
        return;

    mutex_lock(&priv->bf_mutex);
    idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
    bf->uar->free_bf_bmap &= ~(1 << idx);
    if (!bf->uar->free_bf_bmap) {
        if (!list_empty(&bf->uar->bf_list))
            list_del(&bf->uar->bf_list);

        io_mapping_unmap(bf->uar->bf_map);
        iounmap(bf->uar->map);
        mlx4_uar_free(dev, bf->uar);
        kfree(bf->uar);
    } else if (list_empty(&bf->uar->bf_list))
        list_add(&bf->uar->bf_list, &priv->bf_list);

    mutex_unlock(&priv->bf_mutex);
}
EXPORT_SYMBOL_GPL(mlx4_bf_free);

int mlx4_init_uar_table(struct mlx4_dev *dev)
{
    if (dev->caps.num_uars <= 128) {
        mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
             dev->caps.num_uars);
        mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
        return -ENODEV;
    }

    return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
                dev->caps.num_uars, dev->caps.num_uars - 1,
                dev->caps.reserved_uars, 0);
}

void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
{
    mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
}