/*-
 * 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/random.h>
#include <linux/vmalloc.h>
#include <dev/mlx5/driver.h>
#include <dev/mlx5/mlx5_ifc.h>
#include "mlx5_core.h"

#define	MLX5_HEALTH_POLL_INTERVAL	(2 * HZ)
#define	MAX_MISSES			3

static DEFINE_SPINLOCK(health_lock);
static LIST_HEAD(health_list);
static struct work_struct health_work;

static void health_care(struct work_struct *work)
{
	struct mlx5_core_health *health, *n;
	struct mlx5_core_dev *dev;
	struct mlx5_priv *priv;
	LIST_HEAD(tlist);

	spin_lock_irq(&health_lock);
	list_splice_init(&health_list, &tlist);

	spin_unlock_irq(&health_lock);

	list_for_each_entry_safe(health, n, &tlist, list) {
		priv = container_of(health, struct mlx5_priv, health);
		dev = container_of(priv, struct mlx5_core_dev, priv);
		mlx5_core_warn(dev, "handling bad device here\n");
		/* nothing yet */
		spin_lock_irq(&health_lock);
		list_del_init(&health->list);
		spin_unlock_irq(&health_lock);
	}
}

static const char *hsynd_str(u8 synd)
{
	switch (synd) {
	case MLX5_HEALTH_SYNDR_FW_ERR:
		return "firmware internal error";
	case MLX5_HEALTH_SYNDR_IRISC_ERR:
		return "irisc not responding";
	case MLX5_HEALTH_SYNDR_CRC_ERR:
		return "firmware CRC error";
	case MLX5_HEALTH_SYNDR_FETCH_PCI_ERR:
		return "ICM fetch PCI error";
	case MLX5_HEALTH_SYNDR_HW_FTL_ERR:
		return "HW fatal error\n";
	case MLX5_HEALTH_SYNDR_ASYNC_EQ_OVERRUN_ERR:
		return "async EQ buffer overrun";
	case MLX5_HEALTH_SYNDR_EQ_ERR:
		return "EQ error";
	case MLX5_HEALTH_SYNDR_FFSER_ERR:
		return "FFSER error";
	default:
		return "unrecognized error";
	}
}

static u16 read_be16(__be16 __iomem *p)
{
	return swab16(readl((__force u16 __iomem *) p));
}

static u32 read_be32(__be32 __iomem *p)
{
	return swab32(readl((__force u32 __iomem *) p));
}

static void print_health_info(struct mlx5_core_dev *dev)
{
	struct mlx5_core_health *health = &dev->priv.health;
	struct mlx5_health_buffer __iomem *h = health->health;
	int i;

	for (i = 0; i < ARRAY_SIZE(h->assert_var); i++)
		printf("mlx5_core: INFO: ""assert_var[%d] 0x%08x\n", i, read_be32(h->assert_var + i));

	printf("mlx5_core: INFO: ""assert_exit_ptr 0x%08x\n", read_be32(&h->assert_exit_ptr));
	printf("mlx5_core: INFO: ""assert_callra 0x%08x\n", read_be32(&h->assert_callra));
	printf("mlx5_core: INFO: ""fw_ver 0x%08x\n", read_be32(&h->fw_ver));
	printf("mlx5_core: INFO: ""hw_id 0x%08x\n", read_be32(&h->hw_id));
	printf("mlx5_core: INFO: ""irisc_index %d\n", readb(&h->irisc_index));
	printf("mlx5_core: INFO: ""synd 0x%x: %s\n", readb(&h->synd), hsynd_str(readb(&h->synd)));
	printf("mlx5_core: INFO: ""ext_sync 0x%04x\n", read_be16(&h->ext_sync));
}

static void poll_health(unsigned long data)
{
	struct mlx5_core_dev *dev = (struct mlx5_core_dev *)data;
	struct mlx5_core_health *health = &dev->priv.health;
	int next;
	u32 count;

	count = ioread32be(health->health_counter);
	if (count == health->prev)
		++health->miss_counter;
	else
		health->miss_counter = 0;

	health->prev = count;
	if (health->miss_counter == MAX_MISSES) {
		mlx5_core_err(dev, "device's health compromised\n");
		print_health_info(dev);
		spin_lock_irq(&health_lock);
		list_add_tail(&health->list, &health_list);
		spin_unlock_irq(&health_lock);

		if (!queue_work(mlx5_core_wq, &health_work))
			mlx5_core_warn(dev, "failed to queue health work\n");
	} else {
		get_random_bytes(&next, sizeof(next));
		next %= HZ;
		next += jiffies + MLX5_HEALTH_POLL_INTERVAL;
		mod_timer(&health->timer, next);
	}
}

void mlx5_start_health_poll(struct mlx5_core_dev *dev)
{
	struct mlx5_core_health *health = &dev->priv.health;

	INIT_LIST_HEAD(&health->list);
	init_timer(&health->timer);
	health->health = &dev->iseg->health;
	health->health_counter = &dev->iseg->health_counter;

	setup_timer(&health->timer, poll_health, (unsigned long)dev);
	mod_timer(&health->timer,
		  round_jiffies(jiffies + MLX5_HEALTH_POLL_INTERVAL));
}

void mlx5_stop_health_poll(struct mlx5_core_dev *dev)
{
	struct mlx5_core_health *health = &dev->priv.health;

	del_timer_sync(&health->timer);

	spin_lock_irq(&health_lock);
	if (!list_empty(&health->list))
		list_del_init(&health->list);
	spin_unlock_irq(&health_lock);
}

void mlx5_health_cleanup(void)
{
}

void  __init mlx5_health_init(void)
{

	INIT_WORK(&health_work, health_care);
}