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linux/drivers/s390/block/dasd_int.h
Stefan Haberland 5e6bdd37c5 s390/dasd: fix data corruption for thin provisioned devices 
Devices are formatted in multiple of tracks.
For an Extent Space Efficient (ESE) volume we get errors when accessing
unformatted tracks. In this case the driver either formats the track on
the flight for write requests or returns zero data for read requests.

In case a request spans multiple tracks, the indication of an unformatted
track presented for the first track is incorrectly applied to all tracks
covered by the request. As a result, tracks containing data will be handled
as empty, resulting in zero data being returned on read, or overwriting
existing data with zero on write.

Fix by determining the track that gets the NRF error.
For write requests only format the track that is surely not formatted.
For Read requests all tracks before have returned valid data and should not
be touched.
All tracks after the unformatted track might be formatted or not. Those are
returned to the blocklayer to build a new request.

When using alias devices there is a chance that multiple write requests
trigger a format of the same track which might lead to data loss. Ensure
that a track is formatted only once by maintaining a list of currently
processed tracks.

Fixes: 5e2b17e712 ("s390/dasd: Add dynamic formatting support for ESE volumes")
Cc: stable@vger.kernel.org # 5.3+
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-03-12 07:24:52 -06:00

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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>
* 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 char cpmode; /* 0 = cmd mode, 1 = itcw */
char status; /* status of this request */
char lpm; /* logical path mask */
unsigned long flags; /* flags of this request */
struct dasd_queue *dq;
unsigned long starttime; /* jiffies time of request start */
unsigned long expires; /* expiration period in jiffies */
void *data; /* pointer to data area */
struct irb irb; /* device status in case of an error */
struct dasd_ccw_req *refers; /* ERP-chain queueing. */
void *function; /* originating ERP action */
void *mem_chunk;
unsigned long buildclk; /* TOD-clock of request generation */
unsigned long startclk; /* TOD-clock of request start */
unsigned long stopclk; /* TOD-clock of request interrupt */
unsigned long endclk; /* TOD-clock of request termination */
void (*callback)(struct dasd_ccw_req *, void *data);
void *callback_data;
unsigned int proc_bytes; /* bytes for partial completion */
};
/*
* dasd_ccw_req -> status can be:
*/
#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
#define DASD_CQR_DONE 0x01 /* request is completed successfully */
#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
#define DASD_CQR_FAILED 0x04 /* request is finally failed */
#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
#define DASD_CQR_ERROR 0x82 /* request is completed with error */
#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
#define DASD_CQR_CLEARED 0x84 /* request was cleared */
#define DASD_CQR_SUCCESS 0x85 /* request was successful */
/* default expiration time*/
#define DASD_EXPIRES 300
#define DASD_EXPIRES_MAX 40000000
#define DASD_RETRIES 256
#define DASD_RETRIES_MAX 32768
/* per dasd_ccw_req flags */
#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
#define DASD_CQR_VERIFY_PATH 2 /* path verification request */
#define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was
* stolen. Should not be combined with
* DASD_CQR_FLAGS_USE_ERP
*/
/*
* The following flags are used to suppress output of certain errors.
*/
#define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */
#define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/
#define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */
#define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */
#define DASD_REQ_PER_DEV 4
/* Signature for error recovery functions. */
typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
/*
* A single CQR can only contain a maximum of 255 CCWs. It is limited by
* the locate record and locate record extended count value which can only hold
* 1 Byte max.
*/
#define DASD_CQR_MAX_CCW 255
/*
* Unique identifier for dasd device.
*/
#define UA_NOT_CONFIGURED 0x00
#define UA_BASE_DEVICE 0x01
#define UA_BASE_PAV_ALIAS 0x02
#define UA_HYPER_PAV_ALIAS 0x03
struct dasd_uid {
__u8 type;
char vendor[4];
char serial[15];
__u16 ssid;
__u8 real_unit_addr;
__u8 base_unit_addr;
char vduit[33];
};
/*
* the struct dasd_discipline is
* sth like a table of virtual functions, if you think of dasd_eckd
* inheriting dasd...
* no, currently we are not planning to reimplement the driver in C++
*/
struct dasd_discipline {
struct module *owner;
char ebcname[8]; /* a name used for tagging and printks */
char name[8]; /* a name used for tagging and printks */
struct list_head list; /* used for list of disciplines */
/*
* Device recognition functions. check_device is used to verify
* the sense data and the information returned by read device
* characteristics. It returns 0 if the discipline can be used
* for the device in question. uncheck_device is called during
* device shutdown to deregister a device from its discipline.
*/
int (*check_device) (struct dasd_device *);
void (*uncheck_device) (struct dasd_device *);
/*
* do_analysis is used in the step from device state "basic" to
* state "accept". It returns 0 if the device can be made ready,
* it returns -EMEDIUMTYPE if the device can't be made ready or
* -EAGAIN if do_analysis started a ccw that needs to complete
* before the analysis may be repeated.
*/
int (*do_analysis) (struct dasd_block *);
/*
* This function is called, when new paths become available.
* Disciplins may use this callback to do necessary setup work,
* e.g. verify that new path is compatible with the current
* configuration.
*/
int (*verify_path)(struct dasd_device *, __u8);
/*
* Last things to do when a device is set online, and first things
* when it is set offline.
*/
int (*basic_to_ready) (struct dasd_device *);
int (*online_to_ready) (struct dasd_device *);
int (*basic_to_known)(struct dasd_device *);
/*
* Initialize block layer request queue.
*/
void (*setup_blk_queue)(struct dasd_block *);
/* (struct dasd_device *);
* Device operation functions. build_cp creates a ccw chain for
* a block device request, start_io starts the request and
* term_IO cancels it (e.g. in case of a timeout). format_device
* formats the device and check_device_format compares the format of
* a device with the expected format_data.
* handle_terminated_request allows to examine a cqr and prepare
* it for retry.
*/
struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
struct dasd_block *,
struct request *);
int (*start_IO) (struct dasd_ccw_req *);
int (*term_IO) (struct dasd_ccw_req *);
void (*handle_terminated_request) (struct dasd_ccw_req *);
int (*format_device) (struct dasd_device *,
struct format_data_t *, int);
int (*check_device_format)(struct dasd_device *,
struct format_check_t *, int);
int (*free_cp) (struct dasd_ccw_req *, struct request *);
/*
* Error recovery functions. examine_error() returns a value that
* indicates what to do for an error condition. If examine_error()
* returns 'dasd_era_recover' erp_action() is called to create a
* special error recovery ccw. erp_postaction() is called after
* an error recovery ccw has finished its execution. dump_sense
* is called for every error condition to print the sense data
* to the console.
*/
dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
struct irb *);
void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
void (*check_for_device_change) (struct dasd_device *,
struct dasd_ccw_req *,
struct irb *);
/* i/o control functions. */
int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
/* suspend/resume functions */
int (*freeze) (struct dasd_device *);
int (*restore) (struct dasd_device *);
/* reload device after state change */
int (*reload) (struct dasd_device *);
int (*get_uid) (struct dasd_device *, struct dasd_uid *);
void (*kick_validate) (struct dasd_device *);
int (*check_attention)(struct dasd_device *, __u8);
int (*host_access_count)(struct dasd_device *);
int (*hosts_print)(struct dasd_device *, struct seq_file *);
void (*handle_hpf_error)(struct dasd_device *, struct irb *);
void (*disable_hpf)(struct dasd_device *);
int (*hpf_enabled)(struct dasd_device *);
void (*reset_path)(struct dasd_device *, __u8);
/*
* Extent Space Efficient (ESE) relevant functions
*/
int (*is_ese)(struct dasd_device *);
/* Capacity */
int (*space_allocated)(struct dasd_device *);
int (*space_configured)(struct dasd_device *);
int (*logical_capacity)(struct dasd_device *);
int (*release_space)(struct dasd_device *, struct format_data_t *);
/* Extent Pool */
int (*ext_pool_id)(struct dasd_device *);
int (*ext_size)(struct dasd_device *);
int (*ext_pool_cap_at_warnlevel)(struct dasd_device *);
int (*ext_pool_warn_thrshld)(struct dasd_device *);
int (*ext_pool_oos)(struct dasd_device *);
int (*ext_pool_exhaust)(struct dasd_device *, struct dasd_ccw_req *);
struct dasd_ccw_req *(*ese_format)(struct dasd_device *,
struct dasd_ccw_req *, struct irb *);
int (*ese_read)(struct dasd_ccw_req *, struct irb *);
};
extern struct dasd_discipline *dasd_diag_discipline_pointer;
/*
* Notification numbers for extended error reporting notifications:
* The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
* eer pointer) is freed. The error reporting module needs to do all necessary
* cleanup steps.
* The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
*/
#define DASD_EER_DISABLE 0
#define DASD_EER_TRIGGER 1
/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
#define DASD_EER_FATALERROR 1
#define DASD_EER_NOPATH 2
#define DASD_EER_STATECHANGE 3
#define DASD_EER_PPRCSUSPEND 4
#define DASD_EER_NOSPC 5
/* DASD path handling */
#define DASD_PATH_OPERATIONAL 1
#define DASD_PATH_TBV 2
#define DASD_PATH_PP 3
#define DASD_PATH_NPP 4
#define DASD_PATH_MISCABLED 5
#define DASD_PATH_NOHPF 6
#define DASD_PATH_CUIR 7
#define DASD_PATH_IFCC 8
#define DASD_THRHLD_MAX 4294967295U
#define DASD_INTERVAL_MAX 4294967295U
struct dasd_path {
unsigned long flags;
u8 cssid;
u8 ssid;
u8 chpid;
struct dasd_conf_data *conf_data;
atomic_t error_count;
unsigned long errorclk;
};
struct dasd_profile_info {
/* legacy part of profile data, as in dasd_profile_info_t */
unsigned int dasd_io_reqs; /* number of requests processed */
unsigned int dasd_io_sects; /* number of sectors processed */
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]; /* h. of requests's times per sector */
unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
/* new data */
struct timespec64 starttod; /* time of start or last reset */
unsigned int dasd_io_alias; /* requests using an alias */
unsigned int dasd_io_tpm; /* requests using transport mode */
unsigned int dasd_read_reqs; /* total number of read requests */
unsigned int dasd_read_sects; /* total number read sectors */
unsigned int dasd_read_alias; /* read request using an alias */
unsigned int dasd_read_tpm; /* read requests in transport mode */
unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
unsigned int dasd_read_times[32]; /* histogram of requests's times */
unsigned int dasd_read_time1[32]; /* hist. time from build to start */
unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
unsigned long dasd_sum_times; /* sum of request times */
unsigned long dasd_sum_time_str; /* sum of time from build to start */
unsigned long dasd_sum_time_irq; /* sum of time from start to irq */
unsigned long dasd_sum_time_end; /* sum of time from irq to end */
};
struct dasd_profile {
struct dentry *dentry;
struct dasd_profile_info *data;
spinlock_t lock;
};
struct dasd_format_entry {
struct list_head list;
sector_t track;
};
struct dasd_device {
/* Block device stuff. */
struct dasd_block *block;
unsigned int devindex;
unsigned long flags; /* per device flags */
unsigned short features; /* copy of devmap-features (read-only!) */
/* extended error reporting stuff (eer) */
struct dasd_ccw_req *eer_cqr;
/* Device discipline stuff. */
struct dasd_discipline *discipline;
struct dasd_discipline *base_discipline;
void *private;
struct dasd_path path[8];
__u8 opm;
/* Device state and target state. */
int state, target;
struct mutex state_mutex;
int stopped; /* device (ccw_device_start) was stopped */
/* reference count. */
atomic_t ref_count;
/* ccw queue and memory for static ccw/erp buffers. */
struct list_head ccw_queue;
spinlock_t mem_lock;
void *ccw_mem;
void *erp_mem;
void *ese_mem;
struct list_head ccw_chunks;
struct list_head erp_chunks;
struct list_head ese_chunks;
atomic_t tasklet_scheduled;
struct tasklet_struct tasklet;
struct work_struct kick_work;
struct work_struct restore_device;
struct work_struct reload_device;
struct work_struct kick_validate;
struct work_struct suc_work;
struct work_struct requeue_requests;
struct timer_list timer;
debug_info_t *debug_area;
struct ccw_device *cdev;
/* hook for alias management */
struct list_head alias_list;
/* default expiration time in s */
unsigned long default_expires;
unsigned long default_retries;
unsigned long blk_timeout;
unsigned long path_thrhld;
unsigned long path_interval;
struct dentry *debugfs_dentry;
struct dentry *hosts_dentry;
struct dasd_profile profile;
struct dasd_format_entry format_entry;
};
struct dasd_block {
/* Block device stuff. */
struct gendisk *gdp;
struct request_queue *request_queue;
spinlock_t request_queue_lock;
struct blk_mq_tag_set tag_set;
struct block_device *bdev;
atomic_t open_count;
unsigned long blocks; /* size of volume in blocks */
unsigned int bp_block; /* bytes per block */
unsigned int s2b_shift; /* log2 (bp_block/512) */
struct dasd_device *base;
struct list_head ccw_queue;
spinlock_t queue_lock;
atomic_t tasklet_scheduled;
struct tasklet_struct tasklet;
struct timer_list timer;
struct dentry *debugfs_dentry;
struct dasd_profile profile;
struct list_head format_list;
spinlock_t format_lock;
};
struct dasd_attention_data {
struct dasd_device *device;
__u8 lpum;
};
struct dasd_queue {
spinlock_t lock;
};
/* reasons why device (ccw_device_start) was stopped */
#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
#define DASD_STOPPED_PENDING 4 /* long busy */
#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
#define DASD_STOPPED_SU 16 /* summary unit check handling */
#define DASD_STOPPED_PM 32 /* pm state transition */
#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
#define DASD_STOPPED_NOSPC 128 /* no space left */
/* per device flags */
#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
* confuse this with the user specified
* read-only feature.
*/
#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
#define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
#define DASD_FLAG_SUC 14 /* unhandled summary unit check */
#define DASD_SLEEPON_START_TAG ((void *) 1)
#define DASD_SLEEPON_END_TAG ((void *) 2)
void dasd_put_device_wake(struct dasd_device *);
/*
* Reference count inliners
*/
static inline void
dasd_get_device(struct dasd_device *device)
{
atomic_inc(&device->ref_count);
}
static inline void
dasd_put_device(struct dasd_device *device)
{
if (atomic_dec_return(&device->ref_count) == 0)
dasd_put_device_wake(device);
}
/*
* The static memory in ccw_mem and erp_mem is managed by a sorted
* list of free memory chunks.
*/
struct dasd_mchunk
{
struct list_head list;
unsigned long size;
} __attribute__ ((aligned(8)));
static inline void
dasd_init_chunklist(struct list_head *chunk_list, void *mem,
unsigned long size)
{
struct dasd_mchunk *chunk;
INIT_LIST_HEAD(chunk_list);
chunk = (struct dasd_mchunk *) mem;
chunk->size = size - sizeof(struct dasd_mchunk);
list_add(&chunk->list, chunk_list);
}
static inline void *
dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
{
struct dasd_mchunk *chunk, *tmp;
size = (size + 7L) & -8L;
list_for_each_entry(chunk, chunk_list, list) {
if (chunk->size < size)
continue;
if (chunk->size > size + sizeof(struct dasd_mchunk)) {
char *endaddr = (char *) (chunk + 1) + chunk->size;
tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
tmp->size = size;
chunk->size -= size + sizeof(struct dasd_mchunk);
chunk = tmp;
} else
list_del(&chunk->list);
return (void *) (chunk + 1);
}
return NULL;
}
static inline void
dasd_free_chunk(struct list_head *chunk_list, void *mem)
{
struct dasd_mchunk *chunk, *tmp;
struct list_head *p, *left;
chunk = (struct dasd_mchunk *)
((char *) mem - sizeof(struct dasd_mchunk));
/* Find out the left neighbour in chunk_list. */
left = chunk_list;
list_for_each(p, chunk_list) {
if (list_entry(p, struct dasd_mchunk, list) > chunk)
break;
left = p;
}
/* Try to merge with right neighbour = next element from left. */
if (left->next != chunk_list) {
tmp = list_entry(left->next, struct dasd_mchunk, list);
if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
list_del(&tmp->list);
chunk->size += tmp->size + sizeof(struct dasd_mchunk);
}
}
/* Try to merge with left neighbour. */
if (left != chunk_list) {
tmp = list_entry(left, struct dasd_mchunk, list);
if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
tmp->size += chunk->size + sizeof(struct dasd_mchunk);
return;
}
}
__list_add(&chunk->list, left, left->next);
}
/*
* Check if bsize is in { 512, 1024, 2048, 4096 }
*/
static inline int
dasd_check_blocksize(int bsize)
{
if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
return -EMEDIUMTYPE;
return 0;
}
/* externals in dasd.c */
#define DASD_PROFILE_OFF 0
#define DASD_PROFILE_ON 1
#define DASD_PROFILE_GLOBAL_ONLY 2
extern debug_info_t *dasd_debug_area;
extern struct dasd_profile dasd_global_profile;
extern unsigned int dasd_global_profile_level;
extern const struct block_device_operations dasd_device_operations;
extern struct kmem_cache *dasd_page_cache;
struct dasd_ccw_req *
dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *);
struct dasd_ccw_req *dasd_fmalloc_request(int, int, int, struct dasd_device *);
void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
void dasd_ffree_request(struct dasd_ccw_req *, struct dasd_device *);
void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
struct dasd_device *dasd_alloc_device(void);
void dasd_free_device(struct dasd_device *);
struct dasd_block *dasd_alloc_block(void);
void dasd_free_block(struct dasd_block *);
enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
void dasd_enable_device(struct dasd_device *);
void dasd_set_target_state(struct dasd_device *, int);
void dasd_kick_device(struct dasd_device *);
void dasd_restore_device(struct dasd_device *);
void dasd_reload_device(struct dasd_device *);
void dasd_schedule_requeue(struct dasd_device *);
void dasd_add_request_head(struct dasd_ccw_req *);
void dasd_add_request_tail(struct dasd_ccw_req *);
int dasd_start_IO(struct dasd_ccw_req *);
int dasd_term_IO(struct dasd_ccw_req *);
void dasd_schedule_device_bh(struct dasd_device *);
void dasd_schedule_block_bh(struct dasd_block *);
int dasd_sleep_on(struct dasd_ccw_req *);
int dasd_sleep_on_queue(struct list_head *);
int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
int dasd_sleep_on_queue_interruptible(struct list_head *);
int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
void dasd_device_set_timer(struct dasd_device *, int);
void dasd_device_clear_timer(struct dasd_device *);
void dasd_block_set_timer(struct dasd_block *, int);
void dasd_block_clear_timer(struct dasd_block *);
int dasd_cancel_req(struct dasd_ccw_req *);
int dasd_flush_device_queue(struct dasd_device *);
int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
void dasd_generic_free_discipline(struct dasd_device *);
void dasd_generic_remove (struct ccw_device *cdev);
int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
int dasd_generic_set_offline (struct ccw_device *cdev);
int dasd_generic_notify(struct ccw_device *, int);
int dasd_generic_last_path_gone(struct dasd_device *);
int dasd_generic_path_operational(struct dasd_device *);
void dasd_generic_shutdown(struct ccw_device *);
void dasd_generic_handle_state_change(struct dasd_device *);
int dasd_generic_pm_freeze(struct ccw_device *);
int dasd_generic_restore_device(struct ccw_device *);
enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
void dasd_generic_path_event(struct ccw_device *, int *);
int dasd_generic_verify_path(struct dasd_device *, __u8);
void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *);
void dasd_generic_space_avail(struct dasd_device *);
int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
char *dasd_get_sense(struct irb *);
void dasd_device_set_stop_bits(struct dasd_device *, int);
void dasd_device_remove_stop_bits(struct dasd_device *, int);
int dasd_device_is_ro(struct dasd_device *);
void dasd_profile_reset(struct dasd_profile *);
int dasd_profile_on(struct dasd_profile *);
void dasd_profile_off(struct dasd_profile *);
char *dasd_get_user_string(const char __user *, size_t);
/* externals in dasd_devmap.c */
extern int dasd_max_devindex;
extern int dasd_probeonly;
extern int dasd_autodetect;
extern int dasd_nopav;
extern int dasd_nofcx;
int dasd_devmap_init(void);
void dasd_devmap_exit(void);
struct dasd_device *dasd_create_device(struct ccw_device *);
void dasd_delete_device(struct dasd_device *);
int dasd_get_feature(struct ccw_device *, int);
int dasd_set_feature(struct ccw_device *, int, int);
int dasd_add_sysfs_files(struct ccw_device *);
void dasd_remove_sysfs_files(struct ccw_device *);
struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
struct dasd_device *dasd_device_from_devindex(int);
void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
int dasd_parse(void) __init;
int dasd_busid_known(const char *);
/* externals in dasd_gendisk.c */
int dasd_gendisk_init(void);
void dasd_gendisk_exit(void);
int dasd_gendisk_alloc(struct dasd_block *);
void dasd_gendisk_free(struct dasd_block *);
int dasd_scan_partitions(struct dasd_block *);
void dasd_destroy_partitions(struct dasd_block *);
/* externals in dasd_ioctl.c */
int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
/* externals in dasd_proc.c */
int dasd_proc_init(void);
void dasd_proc_exit(void);
/* externals in dasd_erp.c */
struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
struct dasd_device *);
void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
/* externals in dasd_3990_erp.c */
struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
/* externals in dasd_eer.c */
#ifdef CONFIG_DASD_EER
int dasd_eer_init(void);
void dasd_eer_exit(void);
int dasd_eer_enable(struct dasd_device *);
void dasd_eer_disable(struct dasd_device *);
void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
unsigned int id);
void dasd_eer_snss(struct dasd_device *);
static inline int dasd_eer_enabled(struct dasd_device *device)
{
return device->eer_cqr != NULL;
}
#else
#define dasd_eer_init() (0)
#define dasd_eer_exit() do { } while (0)
#define dasd_eer_enable(d) (0)
#define dasd_eer_disable(d) do { } while (0)
#define dasd_eer_write(d,c,i) do { } while (0)
#define dasd_eer_snss(d) do { } while (0)
#define dasd_eer_enabled(d) (0)
#endif /* CONFIG_DASD_ERR */
/* DASD path handling functions */
/*
* helper functions to modify bit masks for a given channel path for a device
*/
static inline int dasd_path_is_operational(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
}
static inline int dasd_path_need_verify(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_TBV, &device->path[chp].flags);
}
static inline void dasd_path_verify(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_TBV, &device->path[chp].flags);
}
static inline void dasd_path_clear_verify(struct dasd_device *device, int chp)
{
__clear_bit(DASD_PATH_TBV, &device->path[chp].flags);
}
static inline void dasd_path_clear_all_verify(struct dasd_device *device)
{
int chp;
for (chp = 0; chp < 8; chp++)
dasd_path_clear_verify(device, chp);
}
static inline void dasd_path_operational(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
device->opm |= (0x80 >> chp);
}
static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_NPP, &device->path[chp].flags);
}
static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_NPP, &device->path[chp].flags);
}
static inline void dasd_path_clear_nonpreferred(struct dasd_device *device,
int chp)
{
__clear_bit(DASD_PATH_NPP, &device->path[chp].flags);
}
static inline void dasd_path_preferred(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_PP, &device->path[chp].flags);
}
static inline int dasd_path_is_preferred(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_PP, &device->path[chp].flags);
}
static inline void dasd_path_clear_preferred(struct dasd_device *device,
int chp)
{
__clear_bit(DASD_PATH_PP, &device->path[chp].flags);
}
static inline void dasd_path_clear_oper(struct dasd_device *device, int chp)
{
__clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
device->opm &= ~(0x80 >> chp);
}
static inline void dasd_path_clear_cable(struct dasd_device *device, int chp)
{
__clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
}
static inline void dasd_path_cuir(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_CUIR, &device->path[chp].flags);
}
static inline int dasd_path_is_cuir(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_CUIR, &device->path[chp].flags);
}
static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp)
{
__clear_bit(DASD_PATH_CUIR, &device->path[chp].flags);
}
static inline void dasd_path_ifcc(struct dasd_device *device, int chp)
{
set_bit(DASD_PATH_IFCC, &device->path[chp].flags);
}
static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_IFCC, &device->path[chp].flags);
}
static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp)
{
clear_bit(DASD_PATH_IFCC, &device->path[chp].flags);
}
static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp)
{
__clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
}
static inline void dasd_path_miscabled(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
}
static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
}
static inline void dasd_path_nohpf(struct dasd_device *device, int chp)
{
__set_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
}
static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp)
{
return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
}
/*
* get functions for path masks
* will return a path masks for the given device
*/
static inline __u8 dasd_path_get_opm(struct dasd_device *device)
{
return device->opm;
}
static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
{
int chp;
__u8 tbvpm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_need_verify(device, chp))
tbvpm |= 0x80 >> chp;
return tbvpm;
}
static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
{
int chp;
__u8 npm = 0x00;
for (chp = 0; chp < 8; chp++) {
if (dasd_path_is_nonpreferred(device, chp))
npm |= 0x80 >> chp;
}
return npm;
}
static inline __u8 dasd_path_get_ppm(struct dasd_device *device)
{
int chp;
__u8 ppm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_is_preferred(device, chp))
ppm |= 0x80 >> chp;
return ppm;
}
static inline __u8 dasd_path_get_cablepm(struct dasd_device *device)
{
int chp;
__u8 cablepm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_is_miscabled(device, chp))
cablepm |= 0x80 >> chp;
return cablepm;
}
static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device)
{
int chp;
__u8 cuirpm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_is_cuir(device, chp))
cuirpm |= 0x80 >> chp;
return cuirpm;
}
static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device)
{
int chp;
__u8 ifccpm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_is_ifcc(device, chp))
ifccpm |= 0x80 >> chp;
return ifccpm;
}
static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
{
int chp;
__u8 hpfpm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_is_nohpf(device, chp))
hpfpm |= 0x80 >> chp;
return hpfpm;
}
/*
* add functions for path masks
* the existing path mask will be extended by the given path mask
*/
static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_verify(device, chp);
}
static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device)
{
int chp;
__u8 nopm = 0x00;
for (chp = 0; chp < 8; chp++)
if (dasd_path_is_nohpf(device, chp) ||
dasd_path_is_ifcc(device, chp) ||
dasd_path_is_cuir(device, chp) ||
dasd_path_is_miscabled(device, chp))
nopm |= 0x80 >> chp;
return nopm;
}
static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp)) {
dasd_path_operational(device, chp);
/*
* if the path is used
* it should not be in one of the negative lists
*/
dasd_path_clear_nohpf(device, chp);
dasd_path_clear_cuir(device, chp);
dasd_path_clear_cable(device, chp);
dasd_path_clear_ifcc(device, chp);
}
}
static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_miscabled(device, chp);
}
static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_cuir(device, chp);
}
static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_ifcc(device, chp);
}
static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_nonpreferred(device, chp);
}
static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_nohpf(device, chp);
}
static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_preferred(device, chp);
}
/*
* set functions for path masks
* the existing path mask will be replaced by the given path mask
*/
static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++)
if (pm & (0x80 >> chp))
dasd_path_verify(device, chp);
else
dasd_path_clear_verify(device, chp);
}
static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++) {
dasd_path_clear_oper(device, chp);
if (pm & (0x80 >> chp)) {
dasd_path_operational(device, chp);
/*
* if the path is used
* it should not be in one of the negative lists
*/
dasd_path_clear_nohpf(device, chp);
dasd_path_clear_cuir(device, chp);
dasd_path_clear_cable(device, chp);
dasd_path_clear_ifcc(device, chp);
}
}
}
/*
* remove functions for path masks
* the existing path mask will be cleared with the given path mask
*/
static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm)
{
int chp;
for (chp = 0; chp < 8; chp++) {
if (pm & (0x80 >> chp))
dasd_path_clear_oper(device, chp);
}
}
/*
* add the newly available path to the to be verified pm and remove it from
* normal operation until it is verified
*/
static inline void dasd_path_available(struct dasd_device *device, int chp)
{
dasd_path_clear_oper(device, chp);
dasd_path_verify(device, chp);
}
static inline void dasd_path_notoper(struct dasd_device *device, int chp)
{
dasd_path_clear_oper(device, chp);
dasd_path_clear_preferred(device, chp);
dasd_path_clear_nonpreferred(device, chp);
}
/*
* remove all paths from normal operation
*/
static inline void dasd_path_no_path(struct dasd_device *device)
{
int chp;
for (chp = 0; chp < 8; chp++)
dasd_path_notoper(device, chp);
dasd_path_clear_all_verify(device);
}
/* end - path handling */
#endif /* DASD_H */
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