path: root/drivers/s390/cio/chsc.c

// SPDX-License-Identifier: GPL-2.0
/*
 *   S/390 common I/O routines -- channel subsystem call
 *
 *    Copyright IBM Corp. 1999,2012
 *    Author(s): Ingo Adlung (adlung@de.ibm.com)
 *		 Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Arnd Bergmann (arndb@de.ibm.com)
 */

#define KMSG_COMPONENT "cio"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pci.h>

#include <asm/cio.h>
#include <asm/chpid.h>
#include <asm/chsc.h>
#include <asm/crw.h>
#include <asm/isc.h>
#include <asm/ebcdic.h>
#include <asm/ap.h>

#include "css.h"
#include "cio.h"
#include "cio_debug.h"
#include "ioasm.h"
#include "chp.h"
#include "chsc.h"

static void *sei_page;
static void *chsc_page;
static DEFINE_SPINLOCK(chsc_page_lock);

/**
 * chsc_error_from_response() - convert a chsc response to an error
 * @response: chsc response code
 *
 * Returns an appropriate Linux error code for @response.
 */
int chsc_error_from_response(int response)
{
	switch (response) {
	case 0x0001:
		return 0;
	case 0x0002:
	case 0x0003:
	case 0x0006:
	case 0x0007:
	case 0x0008:
	case 0x000a:
	case 0x0104:
		return -EINVAL;
	case 0x0004:
	case 0x0106:		/* "Wrong Channel Parm" for the op 0x003d */
		return -EOPNOTSUPP;
	case 0x000b:
	case 0x0107:		/* "Channel busy" for the op 0x003d */
		return -EBUSY;
	case 0x0100:
	case 0x0102:
		return -ENOMEM;
	case 0x0108:		/* "HW limit exceeded" for the op 0x003d */
		return -EUSERS;
	default:
		return -EIO;
	}
}
EXPORT_SYMBOL_GPL(chsc_error_from_response);

struct chsc_ssd_area {
	struct chsc_header request;
	u16 :10;
	u16 ssid:2;
	u16 :4;
	u16 f_sch;	  /* first subchannel */
	u16 :16;
	u16 l_sch;	  /* last subchannel */
	u32 :32;
	struct chsc_header response;
	u32 :32;
	u8 sch_valid :