path: root/drivers/s390/scsi/zfcp_aux.c

/*
 * zfcp device driver
 *
 * Module interface and handling of zfcp data structures.
 *
 * Copyright IBM Corporation 2002, 2008
 */

/*
 * Driver authors:
 *            Martin Peschke (originator of the driver)
 *            Raimund Schroeder
 *            Aron Zeh
 *            Wolfgang Taphorn
 *            Stefan Bader
 *            Heiko Carstens (kernel 2.6 port of the driver)
 *            Andreas Herrmann
 *            Maxim Shchetynin
 *            Volker Sameske
 *            Ralph Wuerthner
 *            Michael Loehr
 *            Swen Schillig
 *            Christof Schmitt
 *            Martin Petermann
 *            Sven Schuetz
 */

#include <linux/miscdevice.h>
#include "zfcp_ext.h"

static char *device;
/*********************** FUNCTION PROTOTYPES *********************************/

/* written against the module interface */
static int __init  zfcp_module_init(void);

/*********************** KERNEL/MODULE PARAMETERS  ***************************/

/* declare driver module init/cleanup functions */
module_init(zfcp_module_init);

MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
MODULE_DESCRIPTION
    ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
MODULE_LICENSE("GPL");

module_param(device, charp, 0400);
MODULE_PARM_DESC(device, "specify initial device");

/****************************************************************/
/************** Functions without logging ***********************/
/****************************************************************/

void
_zfcp_hex_dump(char *addr, int count)
{
	int i;
	for (i = 0; i < count; i++) {
		printk("%02x", addr[i]);
		if ((i % 4) == 3)
			printk(" ");
		if ((i % 32) == 31)
			printk("\n");
	}
	if (((i-1) % 32) != 31)
		printk("\n");
}


/****************************************************************/
/****** Functions to handle the request ID hash table    ********/
/****************************************************************/

static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
{
	int idx;

	adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
				    GFP_KERNEL);
	if (!adapter->req_list)
		return -ENOMEM;

	for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
		INIT_LIST_HEAD(&adapter->req_list[idx]);
	return 0;
}

static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
{
	kfree(adapter->req_list);
}

int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
{
	unsigned int idx;

	for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
		if (!list_empty(&adapter->req_list[idx]))
			return 0;
	return 1;
}

/****************************************************************/
/************** Uncategorised Functions *************************/
/****************************************************************/

/**
 * zfcp_device_setup - setup function
 * @str: pointer to parameter string
 *
 * Parse "device=..." parameter string.
 */
static int __init
zfcp_device_setup(char *devstr)
{
	char *tmp, *str;
	size_t len;

	if (!devstr)
		return 0;

	len = strlen(devstr) + 1;
	str = kmalloc(len, GFP_KERNEL);
	if (!str) {
		pr_err("zfcp: Could not allocate memory for "
		       "device parameter string, device not attached.\n");
		return 0;
	}
	memcpy(str, devstr, len);

	tmp = strchr(str, ',');
	if (!tmp)
		goto err_out;
	*tmp++ = '\0';
	strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
	zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';

	zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
	if (*tmp++ != ',')
		goto err_out;
	if (*tmp == '\0')
		goto err_out;

	zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
	if (*tmp != '\0')
		goto err_out;
	kfree(str);
	return 1;

 err_out:
	pr_err("zfcp: Parse error for device parameter string %s, "
	       "device not attached.\n", str);
	kfree(str);
	return 0;
}

static void __init
zfcp_init_device_configure(void)
{
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	struct zfcp_unit *unit;

	down(&zfcp_data.config_sema);
	read_lock_irq(&zfcp_data.config_lock);
	adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
	if (adapter)
		zfcp_adapter_get(adapter);
	read_unlock_irq(&zfcp_data.config_lock);

	if (adapter == NULL)
		goto out_adapter;
	port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
	if (!port)
		goto out_port;
	unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
	if (!unit)
		goto out_unit;
	up(&zfcp_data.config_sema);
	ccw_device_set_online(adapter->ccw_device);
	zfcp_erp_wait(adapter);
	down(&zfcp_data.config_sema);
	zfcp_unit_put(unit);
 out_unit:
	zfcp_port_put(port);
 out_port:
	zfcp_adapter_put(adapter);
 out_adapter:
	up(&zfcp_data.config_sema);
	return;
}

static int calc_alignment(