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405455734e
Add support for parallel-access-volumes to the dasd driver. This allows concurrent access to dasd devices with multiple channel programs. Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
269 lines
10 KiB
C
269 lines
10 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
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*
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* This file is the interface of the DASD device driver, which is exported to user space
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* any future changes wrt the API will result in a change of the APIVERSION reported
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* to userspace by the DASDAPIVER-ioctl
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*
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*/
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#ifndef DASD_H
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#define DASD_H
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#include <linux/ioctl.h>
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#define DASD_IOCTL_LETTER 'D'
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#define DASD_API_VERSION 6
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/*
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* struct dasd_information2_t
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* represents any data about the device, which is visible to userspace.
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* including foramt and featueres.
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*/
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typedef struct dasd_information2_t {
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unsigned int devno; /* S/390 devno */
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unsigned int real_devno; /* for aliases */
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unsigned int schid; /* S/390 subchannel identifier */
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unsigned int cu_type : 16; /* from SenseID */
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unsigned int cu_model : 8; /* from SenseID */
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unsigned int dev_type : 16; /* from SenseID */
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unsigned int dev_model : 8; /* from SenseID */
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unsigned int open_count;
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unsigned int req_queue_len;
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unsigned int chanq_len; /* length of chanq */
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char type[4]; /* from discipline.name, 'none' for unknown */
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unsigned int status; /* current device level */
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unsigned int label_block; /* where to find the VOLSER */
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unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
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unsigned int characteristics_size;
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unsigned int confdata_size;
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char characteristics[64]; /* from read_device_characteristics */
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char configuration_data[256]; /* from read_configuration_data */
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unsigned int format; /* format info like formatted/cdl/ldl/... */
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unsigned int features; /* dasd features like 'ro',... */
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unsigned int reserved0; /* reserved for further use ,... */
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unsigned int reserved1; /* reserved for further use ,... */
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unsigned int reserved2; /* reserved for further use ,... */
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unsigned int reserved3; /* reserved for further use ,... */
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unsigned int reserved4; /* reserved for further use ,... */
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unsigned int reserved5; /* reserved for further use ,... */
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unsigned int reserved6; /* reserved for further use ,... */
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unsigned int reserved7; /* reserved for further use ,... */
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} dasd_information2_t;
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/*
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* values to be used for dasd_information_t.format
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* 0x00: NOT formatted
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* 0x01: Linux disc layout
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* 0x02: Common disc layout
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*/
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#define DASD_FORMAT_NONE 0
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#define DASD_FORMAT_LDL 1
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#define DASD_FORMAT_CDL 2
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/*
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* values to be used for dasd_information_t.features
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* 0x00: default features
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* 0x01: readonly (ro)
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* 0x02: use diag discipline (diag)
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* 0x04: set the device initially online (internal use only)
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*/
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#define DASD_FEATURE_DEFAULT 0x00
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#define DASD_FEATURE_READONLY 0x01
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#define DASD_FEATURE_USEDIAG 0x02
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#define DASD_FEATURE_INITIAL_ONLINE 0x04
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#define DASD_PARTN_BITS 2
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/*
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* struct dasd_information_t
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* represents any data about the data, which is visible to userspace
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*/
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typedef struct dasd_information_t {
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unsigned int devno; /* S/390 devno */
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unsigned int real_devno; /* for aliases */
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unsigned int schid; /* S/390 subchannel identifier */
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unsigned int cu_type : 16; /* from SenseID */
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unsigned int cu_model : 8; /* from SenseID */
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unsigned int dev_type : 16; /* from SenseID */
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unsigned int dev_model : 8; /* from SenseID */
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unsigned int open_count;
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unsigned int req_queue_len;
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unsigned int chanq_len; /* length of chanq */
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char type[4]; /* from discipline.name, 'none' for unknown */
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unsigned int status; /* current device level */
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unsigned int label_block; /* where to find the VOLSER */
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unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
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unsigned int characteristics_size;
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unsigned int confdata_size;
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char characteristics[64]; /* from read_device_characteristics */
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char configuration_data[256]; /* from read_configuration_data */
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} dasd_information_t;
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/*
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* Read Subsystem Data - Perfomance Statistics
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*/
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typedef struct dasd_rssd_perf_stats_t {
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unsigned char invalid:1;
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unsigned char format:3;
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unsigned char data_format:4;
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unsigned char unit_address;
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unsigned short device_status;
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unsigned int nr_read_normal;
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unsigned int nr_read_normal_hits;
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unsigned int nr_write_normal;
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unsigned int nr_write_fast_normal_hits;
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unsigned int nr_read_seq;
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unsigned int nr_read_seq_hits;
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unsigned int nr_write_seq;
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unsigned int nr_write_fast_seq_hits;
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unsigned int nr_read_cache;
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unsigned int nr_read_cache_hits;
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unsigned int nr_write_cache;
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unsigned int nr_write_fast_cache_hits;
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unsigned int nr_inhibit_cache;
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unsigned int nr_bybass_cache;
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unsigned int nr_seq_dasd_to_cache;
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unsigned int nr_dasd_to_cache;
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unsigned int nr_cache_to_dasd;
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unsigned int nr_delayed_fast_write;
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unsigned int nr_normal_fast_write;
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unsigned int nr_seq_fast_write;
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unsigned int nr_cache_miss;
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unsigned char status2;
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unsigned int nr_quick_write_promotes;
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unsigned char reserved;
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unsigned short ssid;
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unsigned char reseved2[96];
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} __attribute__((packed)) dasd_rssd_perf_stats_t;
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/*
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* struct profile_info_t
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* holds the profinling information
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*/
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typedef struct dasd_profile_info_t {
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unsigned int dasd_io_reqs; /* number of requests processed at all */
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unsigned int dasd_io_sects; /* number of sectors processed at all */
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unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
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unsigned int dasd_io_times[32]; /* histogram of requests's times */
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unsigned int dasd_io_timps[32]; /* histogram of requests's times per sector */
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unsigned int dasd_io_time1[32]; /* histogram of time from build to start */
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unsigned int dasd_io_time2[32]; /* histogram of time from start to irq */
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unsigned int dasd_io_time2ps[32]; /* histogram of time from start to irq */
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unsigned int dasd_io_time3[32]; /* histogram of time from irq to end */
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unsigned int dasd_io_nr_req[32]; /* histogram of # of requests in chanq */
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} dasd_profile_info_t;
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/*
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* struct format_data_t
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* represents all data necessary to format a dasd
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*/
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typedef struct format_data_t {
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int start_unit; /* from track */
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int stop_unit; /* to track */
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int blksize; /* sectorsize */
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int intensity;
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} format_data_t;
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/*
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* values to be used for format_data_t.intensity
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* 0/8: normal format
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* 1/9: also write record zero
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* 3/11: also write home address
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* 4/12: invalidate track
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*/
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#define DASD_FMT_INT_FMT_R0 1 /* write record zero */
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#define DASD_FMT_INT_FMT_HA 2 /* write home address, also set FMT_R0 ! */
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#define DASD_FMT_INT_INVAL 4 /* invalidate tracks */
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#define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
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/*
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* struct attrib_data_t
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* represents the operation (cache) bits for the device.
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* Used in DE to influence caching of the DASD.
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*/
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typedef struct attrib_data_t {
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unsigned char operation:3; /* cache operation mode */
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unsigned char reserved:5; /* cache operation mode */
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__u16 nr_cyl; /* no of cyliners for read ahaed */
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__u8 reserved2[29]; /* for future use */
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} __attribute__ ((packed)) attrib_data_t;
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/* definition of operation (cache) bits within attributes of DE */
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#define DASD_NORMAL_CACHE 0x0
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#define DASD_BYPASS_CACHE 0x1
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#define DASD_INHIBIT_LOAD 0x2
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#define DASD_SEQ_ACCESS 0x3
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#define DASD_SEQ_PRESTAGE 0x4
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#define DASD_REC_ACCESS 0x5
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/********************************************************************************
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* SECTION: Definition of IOCTLs
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*
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* Here ist how the ioctl-nr should be used:
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* 0 - 31 DASD driver itself
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* 32 - 239 still open
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* 240 - 255 reserved for EMC
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*******************************************************************************/
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/* Disable the volume (for Linux) */
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#define BIODASDDISABLE _IO(DASD_IOCTL_LETTER,0)
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/* Enable the volume (for Linux) */
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#define BIODASDENABLE _IO(DASD_IOCTL_LETTER,1)
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/* Issue a reserve/release command, rsp. */
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#define BIODASDRSRV _IO(DASD_IOCTL_LETTER,2) /* reserve */
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#define BIODASDRLSE _IO(DASD_IOCTL_LETTER,3) /* release */
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#define BIODASDSLCK _IO(DASD_IOCTL_LETTER,4) /* steal lock */
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/* reset profiling information of a device */
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#define BIODASDPRRST _IO(DASD_IOCTL_LETTER,5)
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/* Quiesce IO on device */
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#define BIODASDQUIESCE _IO(DASD_IOCTL_LETTER,6)
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/* Resume IO on device */
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#define BIODASDRESUME _IO(DASD_IOCTL_LETTER,7)
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/* retrieve API version number */
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#define DASDAPIVER _IOR(DASD_IOCTL_LETTER,0,int)
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/* Get information on a dasd device */
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#define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
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/* retrieve profiling information of a device */
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#define BIODASDPRRD _IOR(DASD_IOCTL_LETTER,2,dasd_profile_info_t)
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/* Get information on a dasd device (enhanced) */
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#define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER,3,dasd_information2_t)
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/* Performance Statistics Read */
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#define BIODASDPSRD _IOR(DASD_IOCTL_LETTER,4,dasd_rssd_perf_stats_t)
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/* Get Attributes (cache operations) */
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#define BIODASDGATTR _IOR(DASD_IOCTL_LETTER,5,attrib_data_t)
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/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
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#define BIODASDFMT _IOW(DASD_IOCTL_LETTER,1,format_data_t)
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/* Set Attributes (cache operations) */
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#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
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#endif /* DASD_H */
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-indent-level: 4
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* c-brace-imaginary-offset: 0
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* c-brace-offset: -4
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* c-argdecl-indent: 4
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* c-label-offset: -4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: 0
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* indent-tabs-mode: nil
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* tab-width: 8
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* End:
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*/
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