/* SPDX-License-Identifier: GPL-2.0 */
/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Horst Hummel <Horst.Hummel@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* Copyright IBM Corp. 1999, 2009
*/
#ifndef DASD_INT_H
#define DASD_INT_H
/* we keep old device allocation scheme; IOW, minors are still in 0..255 */
#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
/*
* States a dasd device can have:
* new: the dasd_device structure is allocated.
* known: the discipline for the device is identified.
* basic: the device can do basic i/o.
* unfmt: the device could not be analyzed (format is unknown).
* ready: partition detection is done and the device is can do block io.
* online: the device accepts requests from the block device queue.
*
* Things to do for startup state transitions:
* new -> known: find discipline for the device and create devfs entries.
* known -> basic: request irq line for the device.
* basic -> ready: do the initial analysis, e.g. format detection,
* do block device setup and detect partitions.
* ready -> online: schedule the device tasklet.
* Things to do for shutdown state transitions:
* online -> ready: just set the new device state.
* ready -> basic: flush requests from the block device layer, clear
* partition information and reset format information.
* basic -> known: terminate all requests and free irq.
* known -> new: remove devfs entries and forget discipline.
*/
#define DASD_STATE_NEW 0
#define DASD_STATE_KNOWN 1
#define DASD_STATE_BASIC 2
#define DASD_STATE_UNFMT 3
#define DASD_STATE_READY 4
#define DASD_STATE_ONLINE 5
#include <linux/module.h>
#include <linux/wait.h>
#include <linux/blkdev.h>
#include <linux/genhd.h>
#include <linux/hdreg.h>
#include <linux/interrupt.h>
#include <linux/log2.h>
#include <asm/ccwdev.h>
#include <linux/workqueue.h>
#include <asm/debug.h>
#include <asm/dasd.h>
#include <asm/idals.h>
#include <linux/bitops.h>
#include <linux/blk-mq.h>
/* DASD discipline magic */
#define DASD_ECKD_MAGIC 0xC5C3D2C4
#define DASD_DIAG_MAGIC 0xC4C9C1C7
#define DASD_FBA_MAGIC 0xC6C2C140
/*
* SECTION: Type definitions
*/
struct dasd_device;
struct dasd_block;
/* BIT DEFINITIONS FOR SENSE DATA */
#define DASD_SENSE_BIT_0 0x80
#define DASD_SENSE_BIT_1 0x40
#define DASD_SENSE_BIT_2 0x20
#define DASD_SENSE_BIT_3 0x10
/* BIT DEFINITIONS FOR SIM SENSE */
#define DASD_SIM_SENSE 0x0F
#define DASD_SIM_MSG_TO_OP 0x03
#define DASD_SIM_LOG 0x0C
/* lock class for nested cdev lock */
#define CDEV_NESTED_FIRST 1
#define CDEV_NESTED_SECOND 2
/*
* SECTION: MACROs for klogd and s390 debug feature (dbf)
*/
#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
do { \
debug_sprintf_event(d_device->debug_area, \
d_level, \
d_str "\n", \
d_data); \
} while(0)
#define DBF_EVENT(d_level, d_str, d_data...)\
do { \
debug_sprintf_event(dasd_debug_area, \
d_level,\
d_str "\n", \
d_data); \
} while(0)
#define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
do { \
struct ccw_dev_id __dev_id; \
ccw_device_get_id(d_cdev, &__dev_id); \
debug_sprintf_event(dasd_debug_area, \
d_level, \
"0.%x.%04x " d_str "\n", \
__dev_id.ssid, __dev_id.devno, d_data); \
} while (0)
/* limit size for an errorstring */
#define ERRORLENGTH 30
/* definition of dbf debug levels */
#define DBF_EMERG 0 /* system is unusable */
#define DBF_ALERT 1 /* action must be taken immediately */
#define DBF_CRIT 2 /* critical conditions */
#define DBF_ERR 3 /* error conditions */
#define DBF_WARNING 4 /* warning conditions */
#define DBF_NOTICE 5 /* normal but significant condition */
#define DBF_INFO 6 /* informational */
#define DBF_DEBUG 6 /* debug-level messages */
/* messages to be written via klogd and dbf */
#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
do { \
printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
dev_name(&d_device->cdev->dev), d_args); \
DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
} while(0)
#define MESSAGE(d_loglevel,d_string,d_args...)\
do { \
printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
DBF_EVENT(DBF_ALERT, d_string, d_args); \
} while(0)
/* messages to be written via klogd only */
#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
do { \
printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
dev_name(&d_device->cdev->dev), d_args); \
} while(0)
#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
do { \
printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
} while(0)
/* Macro to calculate number of blocks per page */
#define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize)
struct dasd_ccw_req {
unsigned int magic; /* Eye catcher */
int intrc; /* internal error, e.g. from start_IO */
struct list_head devlist; /* for dasd_device request queue */
struct list_head blocklist; /* for dasd_block request queue */
struct dasd_block *block; /* the originating block device */
struct dasd_device *memdev; /* the device used to allocate this */
struct dasd_device *startdev; /* device the request is started on */
struct dasd_device *basedev; /* base device if no block->base */
void *cpaddr; /* address of ccw or tcw */
short retries; /* A retry counter */
unsigned