/*
 * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2005, 2011-2013 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you 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.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/init.h>
#include <linux/errno.h>
#ifndef __VMKERNEL_MODULE__
#include <linux/export.h>
#include <linux/io-mapping.h>
#endif	/* __VMKERNEL_MODULE__ */

#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, 0);
		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, 0);
		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);

#ifdef __VMKERNEL_BF_ENABLE__
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);
#endif	/* #ifdef __VMKERNEL_BF_ENABLE__ */

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);
}