/*-
 * Copyright (c) 2013-2015, Mellanox Technologies, Ltd.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/io-mapping.h>
#include <dev/mlx5/driver.h>
#include "mlx5_core.h"

enum {
	NUM_DRIVER_UARS		= 4,
	NUM_LOW_LAT_UUARS	= 4,
};

int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn)
{
	u32 in[MLX5_ST_SZ_DW(alloc_uar_in)];
	u32 out[MLX5_ST_SZ_DW(alloc_uar_out)];
	int err;

	memset(in, 0, sizeof(in));

	MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR);

	memset(out, 0, sizeof(out));
	err = mlx5_cmd_exec_check_status(dev, in, sizeof(in), out, sizeof(out));
	if (err)
		return err;

	*uarn = MLX5_GET(alloc_uar_out, out, uar);

	return 0;
}
EXPORT_SYMBOL(mlx5_cmd_alloc_uar);

int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn)
{
	u32 in[MLX5_ST_SZ_DW(dealloc_uar_in)];
	u32 out[MLX5_ST_SZ_DW(dealloc_uar_out)];

	memset(in, 0, sizeof(in));

	MLX5_SET(dealloc_uar_in, in, opcode, MLX5_CMD_OP_DEALLOC_UAR);
	MLX5_SET(dealloc_uar_in, in, uar, uarn);

	memset(out, 0, sizeof(out));
	return mlx5_cmd_exec_check_status(dev, in,  sizeof(in),
					       out, sizeof(out));
}
EXPORT_SYMBOL(mlx5_cmd_free_uar);

static int need_uuar_lock(int uuarn)
{
	int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE;

	if (uuarn == 0 || tot_uuars - NUM_LOW_LAT_UUARS)
		return 0;

	return 1;
}

int mlx5_alloc_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari)
{
	int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE;
	struct mlx5_bf *bf;
	phys_addr_t addr;
	int err;
	int i;

	uuari->num_uars = NUM_DRIVER_UARS;
	uuari->num_low_latency_uuars = NUM_LOW_LAT_UUARS;

	mutex_init(&uuari->lock);
	uuari->uars = kcalloc(uuari->num_uars, sizeof(*uuari->uars), GFP_KERNEL);

	uuari->bfs = kcalloc(tot_uuars, sizeof(*uuari->bfs), GFP_KERNEL);

	uuari->bitmap = kcalloc(BITS_TO_LONGS(tot_uuars), sizeof(*uuari->bitmap),
				GFP_KERNEL);

	uuari->count = kcalloc(tot_uuars, sizeof(*uuari->count), GFP_KERNEL);

	for (i = 0; i < uuari->num_uars; i++) {
		err = mlx5_cmd_alloc_uar(dev, &uuari->uars[i].index);
		if (err)
			goto out_count;

		addr = pci_resource_start(dev->pdev, 0) +
		       ((phys_addr_t)(uuari->uars[i].index) << PAGE_SHIFT);
		uuari->uars[i].map = ioremap(addr, PAGE_SIZE);
		if (!uuari->uars[i].map) {
			mlx5_cmd_free_uar(dev, uuari->uars[i].index);
			err = -ENOMEM;
			goto out_count;
		}
		mlx5_core_dbg(dev, "allocated uar index 0x%x, mmaped at %p\n",
			      uuari->uars[i].index, uuari->uars[i].map);
	}

	for (i = 0; i < tot_uuars; i++) {
		bf = &uuari->bfs[i];

		bf->buf_size = (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) / 2;
		bf->uar = &uuari->uars[i / MLX5_BF_REGS_PER_PAGE];
		bf->regreg = uuari->uars[i / MLX5_BF_REGS_PER_PAGE].map;
		bf->reg = NULL; /* Add WC support */
		bf->offset = (i % MLX5_BF_REGS_PER_PAGE) *
			     (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) +
			     MLX5_BF_OFFSET;
		bf->need_lock = need_uuar_lock(i);
		spin_lock_init(&bf->lock);
		spin_lock_init(&bf->lock32);
		bf->uuarn = i;
	}

	return 0;

out_count:
	for (i--; i >= 0; i--) {
		iounmap(uuari->uars[i].map);
		mlx5_cmd_free_uar(dev, uuari->uars[i].index);
	}
	kfree(uuari->count);

	kfree(uuari->bitmap);

	kfree(uuari->bfs);

	kfree(uuari->uars);
	return err;
}

int mlx5_free_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari)
{
	int i = uuari->num_uars;

	for (i--; i >= 0; i--) {
		iounmap(uuari->uars[i].map);
		mlx5_cmd_free_uar(dev, uuari->uars[i].index);
	}

	kfree(uuari->count);
	kfree(uuari->bitmap);
	kfree(uuari->bfs);
	kfree(uuari->uars);

	return 0;
}

int mlx5_alloc_map_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar)
{
	phys_addr_t pfn;
	phys_addr_t uar_bar_start;
	int err;

	err = mlx5_cmd_alloc_uar(mdev, &uar->index);
	if (err) {
		mlx5_core_warn(mdev, "mlx5_cmd_alloc_uar() failed, %d\n", err);
		return err;
	}

	uar_bar_start = pci_resource_start(mdev->pdev, 0);
	pfn           = (uar_bar_start >> PAGE_SHIFT) + uar->index;
	uar->map      = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
	if (!uar->map) {
		mlx5_core_warn(mdev, "ioremap() failed, %d\n", err);
		err = -ENOMEM;
		goto err_free_uar;
	}

	if (mdev->priv.bf_mapping)
		uar->bf_map = io_mapping_map_wc(mdev->priv.bf_mapping,
						uar->index << PAGE_SHIFT);

	return 0;

err_free_uar:
	mlx5_cmd_free_uar(mdev, uar->index);

	return err;
}
EXPORT_SYMBOL(mlx5_alloc_map_uar);

void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar)
{
	io_mapping_unmap(uar->bf_map);
	iounmap(uar->map);
	mlx5_cmd_free_uar(mdev, uar->index);
}
EXPORT_SYMBOL(mlx5_unmap_free_uar);