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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/errno.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_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 << 24) - 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_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
{
uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
if (uar->index == -1)
return -ENOMEM;
uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index;
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,
max(128, dev->caps.reserved_uars), 0);
}
void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
{
mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
}
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