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linux/arch/s390/include/asm/dasd.h
Stefan Weinhuber b44b0ab3ba [S390] dasd: add large volume support 
The dasd device driver will now support ECKD devices with more then
65520 cylinders.
In the traditional ECKD adressing scheme each track is addressed
by a 16-bit cylinder and 16-bit head number. The new addressing
scheme makes use of the fact that the actual number of heads is
never larger then 15, so 12 bits of the head number can be redefined
to be part of the cylinder address.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-03-26 15:24:05 +01:00

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/*
* File...........: linux/drivers/s390/block/dasd.c
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
* EMC Symmetrix ioctl Copyright EMC Corporation, 2008
* Author.........: Nigel Hislop <hislop_nigel@emc.com>
*
* This file is the interface of the DASD device driver, which is exported to user space
* any future changes wrt the API will result in a change of the APIVERSION reported
* to userspace by the DASDAPIVER-ioctl
*
*/
#ifndef DASD_H
#define DASD_H
#include <linux/types.h>
#include <linux/ioctl.h>
#define DASD_IOCTL_LETTER 'D'
#define DASD_API_VERSION 6
/*
* struct dasd_information2_t
* represents any data about the device, which is visible to userspace.
* including foramt and featueres.
*/
typedef struct dasd_information2_t {
unsigned int devno; /* S/390 devno */
unsigned int real_devno; /* for aliases */
unsigned int schid; /* S/390 subchannel identifier */
unsigned int cu_type : 16; /* from SenseID */
unsigned int cu_model : 8; /* from SenseID */
unsigned int dev_type : 16; /* from SenseID */
unsigned int dev_model : 8; /* from SenseID */
unsigned int open_count;
unsigned int req_queue_len;
unsigned int chanq_len; /* length of chanq */
char type[4]; /* from discipline.name, 'none' for unknown */
unsigned int status; /* current device level */
unsigned int label_block; /* where to find the VOLSER */
unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
unsigned int characteristics_size;
unsigned int confdata_size;
char characteristics[64]; /* from read_device_characteristics */
char configuration_data[256]; /* from read_configuration_data */
unsigned int format; /* format info like formatted/cdl/ldl/... */
unsigned int features; /* dasd features like 'ro',... */
unsigned int reserved0; /* reserved for further use ,... */
unsigned int reserved1; /* reserved for further use ,... */
unsigned int reserved2; /* reserved for further use ,... */
unsigned int reserved3; /* reserved for further use ,... */
unsigned int reserved4; /* reserved for further use ,... */
unsigned int reserved5; /* reserved for further use ,... */
unsigned int reserved6; /* reserved for further use ,... */
unsigned int reserved7; /* reserved for further use ,... */
} dasd_information2_t;
/*
* values to be used for dasd_information_t.format
* 0x00: NOT formatted
* 0x01: Linux disc layout
* 0x02: Common disc layout
*/
#define DASD_FORMAT_NONE 0
#define DASD_FORMAT_LDL 1
#define DASD_FORMAT_CDL 2
/*
* values to be used for dasd_information_t.features
* 0x00: default features
* 0x01: readonly (ro)
* 0x02: use diag discipline (diag)
* 0x04: set the device initially online (internal use only)
* 0x08: enable ERP related logging
*/
#define DASD_FEATURE_DEFAULT 0x00
#define DASD_FEATURE_READONLY 0x01
#define DASD_FEATURE_USEDIAG 0x02
#define DASD_FEATURE_INITIAL_ONLINE 0x04
#define DASD_FEATURE_ERPLOG 0x08
#define DASD_FEATURE_FAILFAST 0x10
#define DASD_PARTN_BITS 2
/*
* struct dasd_information_t
* represents any data about the data, which is visible to userspace
*/
typedef struct dasd_information_t {
unsigned int devno; /* S/390 devno */
unsigned int real_devno; /* for aliases */
unsigned int schid; /* S/390 subchannel identifier */
unsigned int cu_type : 16; /* from SenseID */
unsigned int cu_model : 8; /* from SenseID */
unsigned int dev_type : 16; /* from SenseID */
unsigned int dev_model : 8; /* from SenseID */
unsigned int open_count;
unsigned int req_queue_len;
unsigned int chanq_len; /* length of chanq */
char type[4]; /* from discipline.name, 'none' for unknown */
unsigned int status; /* current device level */
unsigned int label_block; /* where to find the VOLSER */
unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
unsigned int characteristics_size;
unsigned int confdata_size;
char characteristics[64]; /* from read_device_characteristics */
char configuration_data[256]; /* from read_configuration_data */
} dasd_information_t;
/*
* Read Subsystem Data - Performance Statistics
*/
typedef struct dasd_rssd_perf_stats_t {
unsigned char invalid:1;
unsigned char format:3;
unsigned char data_format:4;
unsigned char unit_address;
unsigned short device_status;
unsigned int nr_read_normal;
unsigned int nr_read_normal_hits;
unsigned int nr_write_normal;
unsigned int nr_write_fast_normal_hits;
unsigned int nr_read_seq;
unsigned int nr_read_seq_hits;
unsigned int nr_write_seq;
unsigned int nr_write_fast_seq_hits;
unsigned int nr_read_cache;
unsigned int nr_read_cache_hits;
unsigned int nr_write_cache;
unsigned int nr_write_fast_cache_hits;
unsigned int nr_inhibit_cache;
unsigned int nr_bybass_cache;
unsigned int nr_seq_dasd_to_cache;
unsigned int nr_dasd_to_cache;
unsigned int nr_cache_to_dasd;
unsigned int nr_delayed_fast_write;
unsigned int nr_normal_fast_write;
unsigned int nr_seq_fast_write;
unsigned int nr_cache_miss;
unsigned char status2;
unsigned int nr_quick_write_promotes;
unsigned char reserved;
unsigned short ssid;
unsigned char reseved2[96];
} __attribute__((packed)) dasd_rssd_perf_stats_t;
/*
* struct profile_info_t
* holds the profinling information
*/
typedef struct dasd_profile_info_t {
unsigned int dasd_io_reqs; /* number of requests processed at all */
unsigned int dasd_io_sects; /* number of sectors processed at all */
unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
unsigned int dasd_io_times[32]; /* histogram of requests's times */
unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */
unsigned int dasd_io_time1[32]; /* histogram of time from build to start */
unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */
unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */
unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
} dasd_profile_info_t;
/*
* struct format_data_t
* represents all data necessary to format a dasd
*/
typedef struct format_data_t {
unsigned int start_unit; /* from track */
unsigned int stop_unit; /* to track */
unsigned int blksize; /* sectorsize */
unsigned int intensity;
} format_data_t;
/*
* values to be used for format_data_t.intensity
* 0/8: normal format
* 1/9: also write record zero
* 3/11: also write home address
* 4/12: invalidate track
*/
#define DASD_FMT_INT_FMT_R0 1 /* write record zero */
#define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
#define DASD_FMT_INT_INVAL 4 /* invalidate tracks */
#define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
/*
* struct attrib_data_t
* represents the operation (cache) bits for the device.
* Used in DE to influence caching of the DASD.
*/
typedef struct attrib_data_t {
unsigned char operation:3; /* cache operation mode */
unsigned char reserved:5; /* cache operation mode */
__u16 nr_cyl; /* no of cyliners for read ahaed */
__u8 reserved2[29]; /* for future use */
} __attribute__ ((packed)) attrib_data_t;
/* definition of operation (cache) bits within attributes of DE */
#define DASD_NORMAL_CACHE 0x0
#define DASD_BYPASS_CACHE 0x1
#define DASD_INHIBIT_LOAD 0x2
#define DASD_SEQ_ACCESS 0x3
#define DASD_SEQ_PRESTAGE 0x4
#define DASD_REC_ACCESS 0x5
/*
* Perform EMC Symmetrix I/O
*/
typedef struct dasd_symmio_parms {
unsigned char reserved[8]; /* compat with older releases */
unsigned long long psf_data; /* char * cast to u64 */
unsigned long long rssd_result; /* char * cast to u64 */
int psf_data_len;
int rssd_result_len;
} __attribute__ ((packed)) dasd_symmio_parms_t;
/********************************************************************************
* SECTION: Definition of IOCTLs
*
* Here ist how the ioctl-nr should be used:
* 0 - 31 DASD driver itself
* 32 - 239 still open
* 240 - 255 reserved for EMC
*******************************************************************************/
/* Disable the volume (for Linux) */
#define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
/* Enable the volume (for Linux) */
#define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1)
/* Issue a reserve/release command, rsp. */
#define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */
#define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */
#define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */
/* reset profiling information of a device */
#define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5)
/* Quiesce IO on device */
#define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
/* Resume IO on device */
#define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7)
/* retrieve API version number */
#define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int)
/* Get information on a dasd device */
#define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
/* retrieve profiling information of a device */
#define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
/* Get information on a dasd device (enhanced) */
#define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
/* Performance Statistics Read */
#define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
/* Get Attributes (cache operations) */
#define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
#define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
/* Set Attributes (cache operations) */
#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
#define BIODASDSYMMIO _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)
#endif /* DASD_H */
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-indent-level: 4
* c-brace-imaginary-offset: 0
* c-brace-offset: -4
* c-argdecl-indent: 4
* c-label-offset: -4
* c-continued-statement-offset: 4
* c-continued-brace-offset: 0
* indent-tabs-mode: nil
* tab-width: 8
* End:
*/
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