/*
 * Copyright 2009 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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.
 * [Insert appropriate license here when releasing outside of Cisco]
 * $Id: fnic_kcompat.c 111268 2012-08-27 17:11:40Z atungara $
 */

#include "fnic.h"
#include "fnic_kcompat.h"

#include <linux/blkdev.h>
#include <linux/device.h>
#include <linux/kernel.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>

/**
 * scsi_dma_map - perform DMA mapping against command's sg lists
 * @cmd:        scsi command
 *
 * Returns the number of sg lists actually used, zero if the sg lists
 * is NULL, or -ENOMEM if the mapping failed.
 */
int scsi_dma_map(struct scsi_cmnd *cmd)
{
	int nseg = 0;

	if (scsi_sg_count(cmd)) {
		struct device *dev = cmd->device->host->shost_gendev.parent;

		nseg = dma_map_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
				  cmd->sc_data_direction);
		if (unlikely(!nseg))
			return -ENOMEM;
	}
	return nseg;
}
#if !defined(__VMKLNX__)
EXPORT_SYMBOL(scsi_dma_map);
#endif /* !defined(__VMKLNX__) */

/**
 * scsi_dma_unmap - unmap command's sg lists mapped by scsi_dma_map
 * @cmd:        scsi command
 */
void scsi_dma_unmap(struct scsi_cmnd *cmd)
{
	if (scsi_sg_count(cmd)) {
		struct device *dev = cmd->device->host->shost_gendev.parent;

		dma_unmap_sg(dev, scsi_sglist(cmd), scsi_sg_count(cmd),
				cmd->sc_data_direction);
	}
}
#if !defined(__VMKLNX__)
EXPORT_SYMBOL(scsi_dma_unmap);
#endif /* !defined(__VMKLNX__) */

/*
 * memmove() implementation taken from vmklinux26/linux/lib/string.c
 */

void *memmove(void *dest, const void *src, size_t count)
{
	char *tmp;
	const char *s;

	if (dest <= src) {
		tmp = dest;
		s = src;
		while (count--)
			*tmp++ = *s++;
	} else {
		tmp = dest;
		tmp += count;
		s = src;
		s += count;
		while (count--)
			*--tmp = *--s;
	}
	return dest;
}
#if !defined(__VMKLNX__)
EXPORT_SYMBOL(memmove);
#endif /* !defined(__VMKLNX__) */

void fnic_block_error_handler(struct scsi_cmnd *sc)
{
	struct Scsi_Host *shost = sc->device->host;
	struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);
	while (rport->port_state == FC_PORTSTATE_BLOCKED) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		msleep(1000);
		spin_lock_irqsave(shost->host_lock, flags);
	}
	spin_unlock_irqrestore(shost->host_lock, flags);
}