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linux/drivers/s390/block/dasd_eckd.h
Gustavo A. R. Silva fa226f1d81 s390: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Link: https://lkml.kernel.org/r/20200221150612.GA9717@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2020-02-27 16:02:21 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Horst Hummel <Horst.Hummel@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* Copyright IBM Corp. 1999, 2000
*
*/
#ifndef DASD_ECKD_H
#define DASD_ECKD_H
/*****************************************************************************
* SECTION: CCW Definitions
****************************************************************************/
#define DASD_ECKD_CCW_WRITE 0x05
#define DASD_ECKD_CCW_READ 0x06
#define DASD_ECKD_CCW_WRITE_HOME_ADDRESS 0x09
#define DASD_ECKD_CCW_READ_HOME_ADDRESS 0x0a
#define DASD_ECKD_CCW_WRITE_KD 0x0d
#define DASD_ECKD_CCW_READ_KD 0x0e
#define DASD_ECKD_CCW_ERASE 0x11
#define DASD_ECKD_CCW_READ_COUNT 0x12
#define DASD_ECKD_CCW_SLCK 0x14
#define DASD_ECKD_CCW_WRITE_RECORD_ZERO 0x15
#define DASD_ECKD_CCW_READ_RECORD_ZERO 0x16
#define DASD_ECKD_CCW_WRITE_CKD 0x1d
#define DASD_ECKD_CCW_READ_CKD 0x1e
#define DASD_ECKD_CCW_PSF 0x27
#define DASD_ECKD_CCW_SNID 0x34
#define DASD_ECKD_CCW_RSSD 0x3e
#define DASD_ECKD_CCW_LOCATE_RECORD 0x47
#define DASD_ECKD_CCW_LOCATE_RECORD_EXT 0x4b
#define DASD_ECKD_CCW_SNSS 0x54
#define DASD_ECKD_CCW_DEFINE_EXTENT 0x63
#define DASD_ECKD_CCW_WRITE_MT 0x85
#define DASD_ECKD_CCW_READ_MT 0x86
#define DASD_ECKD_CCW_WRITE_KD_MT 0x8d
#define DASD_ECKD_CCW_READ_KD_MT 0x8e
#define DASD_ECKD_CCW_READ_COUNT_MT 0x92
#define DASD_ECKD_CCW_RELEASE 0x94
#define DASD_ECKD_CCW_WRITE_FULL_TRACK 0x95
#define DASD_ECKD_CCW_READ_CKD_MT 0x9e
#define DASD_ECKD_CCW_WRITE_CKD_MT 0x9d
#define DASD_ECKD_CCW_WRITE_TRACK_DATA 0xA5
#define DASD_ECKD_CCW_READ_TRACK_DATA 0xA6
#define DASD_ECKD_CCW_RESERVE 0xB4
#define DASD_ECKD_CCW_READ_TRACK 0xDE
#define DASD_ECKD_CCW_PFX 0xE7
#define DASD_ECKD_CCW_PFX_READ 0xEA
#define DASD_ECKD_CCW_RSCK 0xF9
#define DASD_ECKD_CCW_RCD 0xFA
#define DASD_ECKD_CCW_DSO 0xF7
/* Define Subssystem Function / Orders */
#define DSO_ORDER_RAS 0x81
/*
* Perform Subsystem Function / Orders
*/
#define PSF_ORDER_PRSSD 0x18
#define PSF_ORDER_CUIR_RESPONSE 0x1A
#define PSF_ORDER_SSC 0x1D
/*
* Perform Subsystem Function / Sub-Orders
*/
#define PSF_SUBORDER_QHA 0x1C /* Query Host Access */
#define PSF_SUBORDER_VSQ 0x52 /* Volume Storage Query */
#define PSF_SUBORDER_LCQ 0x53 /* Logical Configuration Query */
/*
* CUIR response condition codes
*/
#define PSF_CUIR_INVALID 0x00
#define PSF_CUIR_COMPLETED 0x01
#define PSF_CUIR_NOT_SUPPORTED 0x02
#define PSF_CUIR_ERROR_IN_REQ 0x03
#define PSF_CUIR_DENIED 0x04
#define PSF_CUIR_LAST_PATH 0x05
#define PSF_CUIR_DEVICE_ONLINE 0x06
#define PSF_CUIR_VARY_FAILURE 0x07
#define PSF_CUIR_SOFTWARE_FAILURE 0x08
#define PSF_CUIR_NOT_RECOGNIZED 0x09
/*
* CUIR codes
*/
#define CUIR_QUIESCE 0x01
#define CUIR_RESUME 0x02
/*
* Out-of-space (OOS) Codes
*/
#define REPO_WARN 0x01
#define REPO_EXHAUST 0x02
#define POOL_WARN 0x03
#define POOL_EXHAUST 0x04
#define REPO_RELIEVE 0x05
#define POOL_RELIEVE 0x06
/*
* attention message definitions
*/
#define ATTENTION_LENGTH_CUIR 0x0e
#define ATTENTION_FORMAT_CUIR 0x01
#define ATTENTION_LENGTH_OOS 0x10
#define ATTENTION_FORMAT_OOS 0x06
#define DASD_ECKD_PG_GROUPED 0x10
/*
* Size that is reportet for large volumes in the old 16-bit no_cyl field
*/
#define LV_COMPAT_CYL 0xFFFE
#define FCX_MAX_DATA_FACTOR 65536
#define DASD_ECKD_RCD_DATA_SIZE 256
#define DASD_ECKD_PATH_THRHLD 256
#define DASD_ECKD_PATH_INTERVAL 300
/*
* Maximum number of blocks to be chained
*/
#define DASD_ECKD_MAX_BLOCKS 190
#define DASD_ECKD_MAX_BLOCKS_RAW 256
/*****************************************************************************
* SECTION: Type Definitions
****************************************************************************/
struct eckd_count {
__u16 cyl;
__u16 head;
__u8 record;
__u8 kl;
__u16 dl;
} __attribute__ ((packed));
struct ch_t {
__u16 cyl;
__u16 head;
} __attribute__ ((packed));
struct chr_t {
__u16 cyl;
__u16 head;
__u8 record;
} __attribute__ ((packed));
struct DE_eckd_data {
struct {
unsigned char perm:2; /* Permissions on this extent */
unsigned char reserved:1;
unsigned char seek:2; /* Seek control */
unsigned char auth:2; /* Access authorization */
unsigned char pci:1; /* PCI Fetch mode */
} __attribute__ ((packed)) mask;
struct {
unsigned char mode:2; /* Architecture mode */
unsigned char ckd:1; /* CKD Conversion */
unsigned char operation:3; /* Operation mode */
unsigned char cfw:1; /* Cache fast write */
unsigned char dfw:1; /* DASD fast write */
} __attribute__ ((packed)) attributes;
__u16 blk_size; /* Blocksize */
__u16 fast_write_id;
__u8 ga_additional; /* Global Attributes Additional */
__u8 ga_extended; /* Global Attributes Extended */
struct ch_t beg_ext;
struct ch_t end_ext;
unsigned long ep_sys_time; /* Ext Parameter - System Time Stamp */
__u8 ep_format; /* Extended Parameter format byte */
__u8 ep_prio; /* Extended Parameter priority I/O byte */
__u8 ep_reserved1; /* Extended Parameter Reserved */
__u8 ep_rec_per_track; /* Number of records on a track */
__u8 ep_reserved[4]; /* Extended Parameter Reserved */
} __attribute__ ((packed));
struct LO_eckd_data {
struct {
unsigned char orientation:2;
unsigned char operation:6;
} __attribute__ ((packed)) operation;
struct {
unsigned char last_bytes_used:1;
unsigned char reserved:6;
unsigned char read_count_suffix:1;
} __attribute__ ((packed)) auxiliary;
__u8 unused;
__u8 count;
struct ch_t seek_addr;
struct chr_t search_arg;
__u8 sector;
__u16 length;
} __attribute__ ((packed));
struct LRE_eckd_data {
struct {
unsigned char orientation:2;
unsigned char operation:6;
} __attribute__ ((packed)) operation;
struct {
unsigned char length_valid:1;
unsigned char length_scope:1;
unsigned char imbedded_ccw_valid:1;
unsigned char check_bytes:2;
unsigned char imbedded_count_valid:1;
unsigned char reserved:1;
unsigned char read_count_suffix:1;
} __attribute__ ((packed)) auxiliary;
__u8 imbedded_ccw;
__u8 count;
struct ch_t seek_addr;
struct chr_t search_arg;
__u8 sector;
__u16 length;
__u8 imbedded_count;
__u8 extended_operation;
__u16 extended_parameter_length;
__u8 extended_parameter[];
} __attribute__ ((packed));
/* Prefix data for format 0x00 and 0x01 */
struct PFX_eckd_data {
unsigned char format;
struct {
unsigned char define_extent:1;
unsigned char time_stamp:1;
unsigned char verify_base:1;
unsigned char hyper_pav:1;
unsigned char reserved:4;
} __attribute__ ((packed)) validity;
__u8 base_address;
__u8 aux;
__u8 base_lss;
__u8 reserved[7];
struct DE_eckd_data define_extent;
struct LRE_eckd_data locate_record;
} __attribute__ ((packed));
struct dasd_eckd_characteristics {
__u16 cu_type;
struct {
unsigned char support:2;
unsigned char async:1;
unsigned char reserved:1;
unsigned char cache_info:1;
unsigned char model:3;
} __attribute__ ((packed)) cu_model;
__u16 dev_type;
__u8 dev_model;
struct {
unsigned char mult_burst:1;
unsigned char RT_in_LR:1;
unsigned char reserved1:1;
unsigned char RD_IN_LR:1;
unsigned char reserved2:4;
unsigned char reserved3:8;
unsigned char defect_wr:1;
unsigned char XRC_supported:1;
unsigned char reserved4:1;
unsigned char striping:1;
unsigned char reserved5:4;
unsigned char cfw:1;
unsigned char reserved6:2;
unsigned char cache:1;
unsigned char dual_copy:1;
unsigned char dfw:1;
unsigned char reset_alleg:1;
unsigned char sense_down:1;
} __attribute__ ((packed)) facilities;
__u8 dev_class;
__u8 unit_type;
__u16 no_cyl;
__u16 trk_per_cyl;
__u8 sec_per_trk;
__u8 byte_per_track[3];
__u16 home_bytes;
__u8 formula;
union {
struct {
__u8 f1;
__u16 f2;
__u16 f3;
} __attribute__ ((packed)) f_0x01;
struct {
__u8 f1;
__u8 f2;
__u8 f3;
__u8 f4;
__u8 f5;
} __attribute__ ((packed)) f_0x02;
} __attribute__ ((packed)) factors;
__u16 first_alt_trk;
__u16 no_alt_trk;
__u16 first_dia_trk;
__u16 no_dia_trk;
__u16 first_sup_trk;
__u16 no_sup_trk;
__u8 MDR_ID;
__u8 OBR_ID;
__u8 director;
__u8 rd_trk_set;
__u16 max_rec_zero;
__u8 reserved1;
__u8 RWANY_in_LR;
__u8 factor6;
__u8 factor7;
__u8 factor8;
__u8 reserved2[3];
__u8 reserved3[6];
__u32 long_no_cyl;
} __attribute__ ((packed));
/* elements of the configuration data */
struct dasd_ned {
struct {
__u8 identifier:2;
__u8 token_id:1;
__u8 sno_valid:1;
__u8 subst_sno:1;
__u8 recNED:1;
__u8 emuNED:1;
__u8 reserved:1;
} __attribute__ ((packed)) flags;
__u8 descriptor;
__u8 dev_class;
__u8 reserved;
__u8 dev_type[6];
__u8 dev_model[3];
__u8 HDA_manufacturer[3];
__u8 HDA_location[2];
__u8 HDA_seqno[12];
__u8 ID;
__u8 unit_addr;
} __attribute__ ((packed));
struct dasd_sneq {
struct {
__u8 identifier:2;
__u8 reserved:6;
} __attribute__ ((packed)) flags;
__u8 res1;
__u16 format;
__u8 res2[4]; /* byte 4- 7 */
__u8 sua_flags; /* byte 8 */
__u8 base_unit_addr; /* byte 9 */
__u8 res3[22]; /* byte 10-31 */
} __attribute__ ((packed));
struct vd_sneq {
struct {
__u8 identifier:2;
__u8 reserved:6;
} __attribute__ ((packed)) flags;
__u8 res1;
__u16 format;
__u8 res2[4]; /* byte 4- 7 */
__u8 uit[16]; /* byte 8-23 */
__u8 res3[8]; /* byte 24-31 */
} __attribute__ ((packed));
struct dasd_gneq {
struct {
__u8 identifier:2;
__u8 reserved:6;
} __attribute__ ((packed)) flags;
__u8 record_selector;
__u8 reserved[4];
struct {
__u8 value:2;
__u8 number:6;
} __attribute__ ((packed)) timeout;
__u8 reserved3;
__u16 subsystemID;
__u8 reserved2[22];
} __attribute__ ((packed));
struct dasd_rssd_features {
char feature[256];
} __attribute__((packed));
struct dasd_rssd_messages {
__u16 length;
__u8 format;
__u8 code;
__u32 message_id;
__u8 flags;
char messages[4087];
} __packed;
/*
* Read Subsystem Data - Volume Storage Query
*/
struct dasd_rssd_vsq {
struct {
__u8 tse:1;
__u8 space_not_available:1;
__u8 ese:1;
__u8 unused:5;
} __packed vol_info;
__u8 unused1;
__u16 extent_pool_id;
__u8 warn_cap_limit;
__u8 warn_cap_guaranteed;
__u16 unused2;
__u32 limit_capacity;
__u32 guaranteed_capacity;
__u32 space_allocated;
__u32 space_configured;
__u32 logical_capacity;
} __packed;
/*
* Extent Pool Summary
*/
struct dasd_ext_pool_sum {
__u16 pool_id;
__u8 repo_warn_thrshld;
__u8 warn_thrshld;
struct {
__u8 type:1; /* 0 - CKD / 1 - FB */
__u8 track_space_efficient:1;
__u8 extent_space_efficient:1;
__u8 standard_volume:1;
__u8 extent_size_valid:1;
__u8 capacity_at_warnlevel:1;
__u8 pool_oos:1;
__u8 unused0:1;
__u8 unused1;
} __packed flags;
struct {
__u8 reserved0:1;
__u8 size_1G:1;
__u8 reserved1:5;
__u8 size_16M:1;
} __packed extent_size;
__u8 unused;
} __packed;
/*
* Read Subsystem Data-Response - Logical Configuration Query - Header
*/
struct dasd_rssd_lcq {
__u16 data_length; /* Length of data returned */
__u16 pool_count; /* Count of extent pools returned - Max: 448 */
struct {
__u8 pool_info_valid:1; /* Detailed Information valid */
__u8 pool_id_volume:1;
__u8 pool_id_cec:1;
__u8 unused0:5;
__u8 unused1;
} __packed header_flags;
char sfi_type[6]; /* Storage Facility Image Type (EBCDIC) */
char sfi_model[3]; /* Storage Facility Image Model (EBCDIC) */
__u8 sfi_seq_num[10]; /* Storage Facility Image Sequence Number */
__u8 reserved[7];
struct dasd_ext_pool_sum ext_pool_sum[448];
} __packed;
struct dasd_oos_message {
__u16 length;
__u8 format;
__u8 code;
__u8 percentage_empty;
__u8 reserved;
__u16 ext_pool_id;
__u16 token;
__u8 unused[6];
} __packed;
struct dasd_cuir_message {
__u16 length;
__u8 format;
__u8 code;
__u32 message_id;
__u8 flags;
__u8 neq_map[3];
__u8 ned_map;
__u8 record_selector;
} __packed;
struct dasd_psf_cuir_response {
__u8 order;
__u8 flags;
__u8 cc;
__u8 chpid;
__u16 device_nr;
__u16 reserved;
__u32 message_id;
__u64 system_id;
__u8 cssid;
__u8 ssid;
} __packed;
struct dasd_ckd_path_group_entry {
__u8 status_flags;
__u8 pgid[11];
__u8 sysplex_name[8];
__u32 timestamp;
__u32 cylinder;
__u8 reserved[4];
} __packed;
struct dasd_ckd_host_information {
__u8 access_flags;
__u8 entry_size;
__u16 entry_count;
__u8 entry[16390];
} __packed;
struct dasd_psf_query_host_access {
__u8 access_flag;
__u8 version;
__u16 CKD_length;
__u16 SCSI_length;
__u8 unused[10];
__u8 host_access_information[16394];
} __packed;
/*
* Perform Subsystem Function - Prepare for Read Subsystem Data
*/
struct dasd_psf_prssd_data {
unsigned char order;
unsigned char flags;
unsigned char reserved1;
unsigned char reserved2;
unsigned char lss;
unsigned char volume;
unsigned char suborder;
unsigned char varies[5];
} __attribute__ ((packed));
/*
* Perform Subsystem Function - Set Subsystem Characteristics
*/
struct dasd_psf_ssc_data {
unsigned char order;
unsigned char flags;
unsigned char cu_type[4];
unsigned char suborder;
unsigned char reserved[59];
} __attribute__((packed));
/* Maximum number of extents for a single Release Allocated Space command */
#define DASD_ECKD_RAS_EXTS_MAX 110U
struct dasd_dso_ras_ext_range {
struct ch_t beg_ext;
struct ch_t end_ext;
} __packed;
/*
* Define Subsytem Operation - Release Allocated Space
*/
struct dasd_dso_ras_data {
__u8 order;
struct {
__u8 message:1; /* Must be zero */
__u8 reserved1:2;
__u8 vol_type:1; /* 0 - CKD/FBA, 1 - FB */
__u8 reserved2:4;
} __packed flags;
/* Operation Flags to specify scope */
struct {
__u8 reserved1:2;
/* Release Space by Extent */
__u8 by_extent:1; /* 0 - entire volume, 1 - specified extents */
__u8 guarantee_init:1;
__u8 force_release:1; /* Internal - will be ignored */
__u16 reserved2:11;
} __packed op_flags;
__u8 lss;
__u8 dev_addr;
__u32 reserved1;
__u8 reserved2[10];
__u16 nr_exts; /* Defines number of ext_scope - max 110 */
__u16 reserved3;
} __packed;
/*
* some structures and definitions for alias handling
*/
struct dasd_unit_address_configuration {
struct {
char ua_type;
char base_ua;
} unit[256];
} __attribute__((packed));
#define MAX_DEVICES_PER_LCU 256
/* flags on the LCU */
#define NEED_UAC_UPDATE 0x01
#define UPDATE_PENDING 0x02
enum pavtype {NO_PAV, BASE_PAV, HYPER_PAV};
struct alias_root {
struct list_head serverlist;
spinlock_t lock;
};
struct alias_server {
struct list_head server;
struct dasd_uid uid;
struct list_head lculist;
};
struct summary_unit_check_work_data {
char reason;
struct dasd_device *device;
struct work_struct worker;
};
struct read_uac_work_data {
struct dasd_device *device;
struct delayed_work dwork;
};
struct alias_lcu {
struct list_head lcu;
struct dasd_uid uid;
enum pavtype pav;
char flags;
spinlock_t lock;
struct list_head grouplist;
struct list_head active_devices;
struct list_head inactive_devices;
struct dasd_unit_address_configuration *uac;
struct summary_unit_check_work_data suc_data;
struct read_uac_work_data ruac_data;
struct dasd_ccw_req *rsu_cqr;
struct completion lcu_setup;
};
struct alias_pav_group {
struct list_head group;
struct dasd_uid uid;
struct alias_lcu *lcu;
struct list_head baselist;
struct list_head aliaslist;
struct dasd_device *next;
};
struct dasd_conf_data {
struct dasd_ned neds[5];
u8 reserved[64];
struct dasd_gneq gneq;
} __packed;
struct dasd_eckd_private {
struct dasd_eckd_characteristics rdc_data;
u8 *conf_data;
int conf_len;
/* pointers to specific parts in the conf_data */
struct dasd_ned *ned;
struct dasd_sneq *sneq;
struct vd_sneq *vdsneq;
struct dasd_gneq *gneq;
struct eckd_count count_area[5];
int init_cqr_status;
int uses_cdl;
struct attrib_data_t attrib; /* e.g. cache operations */
struct dasd_rssd_features features;
struct dasd_rssd_vsq vsq;
struct dasd_ext_pool_sum eps;
u32 real_cyl;
/* alias managemnet */
struct dasd_uid uid;
struct alias_pav_group *pavgroup;
struct alias_lcu *lcu;
int count;
u32 fcx_max_data;
char suc_reason;
};
int dasd_alias_make_device_known_to_lcu(struct dasd_device *);
void dasd_alias_disconnect_device_from_lcu(struct dasd_device *);
int dasd_alias_add_device(struct dasd_device *);
int dasd_alias_remove_device(struct dasd_device *);
struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *);
void dasd_alias_handle_summary_unit_check(struct work_struct *);
void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *);
int dasd_alias_update_add_device(struct dasd_device *);
#endif /* DASD_ECKD_H */
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