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linux_old1/drivers/s390/block/dasd_int.h

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/*
* File...........: linux/drivers/s390/block/dasd_int.h
* 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>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
*
*/
#ifndef DASD_INT_H
#define DASD_INT_H
#ifdef __KERNEL__
/* 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>
/*
* 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
/*
* 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_DEV_EXC(d_level, d_device, d_str, d_data...) \
do { \
debug_sprintf_exception(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_EXC(d_level, d_str, d_data...)\
do { \
debug_sprintf_exception(dasd_debug_area, \
d_level,\
d_str "\n", \
d_data); \
} while(0)
/* 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", \
d_device->cdev->dev.bus_id, 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", \
d_device->cdev->dev.bus_id, 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)
struct dasd_ccw_req {
unsigned int magic; /* Eye catcher */
struct list_head devlist; /* for dasd_device request queue */
struct list_head blocklist; /* for dasd_block request queue */
/* Where to execute what... */
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 ccw1 *cpaddr; /* address of channel program */
char status; /* status of this request */
short retries; /* A retry counter */
unsigned long flags; /* flags of this request */
/* ... and how */
unsigned long starttime; /* jiffies time of request start */
int expires; /* expiration period in jiffies */
char lpm; /* logical path mask */
void *data; /* pointer to data area */
/* these are important for recovering erroneous requests */
struct irb irb; /* device status in case of an error */
struct dasd_ccw_req *refers; /* ERP-chain queueing. */
void *function; /* originating ERP action */
/* these are for statistics only */
unsigned long long buildclk; /* TOD-clock of request generation */
unsigned long long startclk; /* TOD-clock of request start */
unsigned long long stopclk; /* TOD-clock of request interrupt */
unsigned long long endclk; /* TOD-clock of request termination */
/* Callback that is called after reaching final status. */
void (*callback)(struct dasd_ccw_req *, void *data);
void *callback_data;
};
/*
* 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 successfull */
/* per dasd_ccw_req flags */
#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
/* Signature for error recovery functions. */
typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
/*
* 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 */
int max_blocks; /* maximum number of blocks to be chained */
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 *);
/*
* Last things to do when a device is set online, and first things
* when it is set offline.
*/
int (*ready_to_online) (struct dasd_device *);
int (*online_to_ready) (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
* returns a ccw chain to be used to format the device.
* 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 *);
struct dasd_ccw_req *(*format_device) (struct dasd_device *,
struct format_data_t *);
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 (*handle_unsolicited_interrupt) (struct dasd_device *,
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 *);
};
extern struct dasd_discipline *dasd_diag_discipline_pointer;
/*
* 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;
};
/*
* 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
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;
char *private;
/* Device state and target state. */
int state, target;
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;
struct list_head ccw_chunks;
struct list_head erp_chunks;
atomic_t tasklet_scheduled;
struct tasklet_struct tasklet;
struct work_struct kick_work;
struct timer_list timer;
debug_info_t *debug_area;
struct ccw_device *cdev;
/* hook for alias management */
struct list_head alias_list;
};
struct dasd_block {
/* Block device stuff. */
struct gendisk *gdp;
struct request_queue *request_queue;
spinlock_t request_queue_lock;
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;
#ifdef CONFIG_DASD_PROFILE
struct dasd_profile_info_t profile;
#endif
};
/* 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 */
/* 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 */
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_ON 1
#define DASD_PROFILE_OFF 0
extern debug_info_t *dasd_debug_area;
extern struct dasd_profile_info_t dasd_global_profile;
extern unsigned int dasd_profile_level;
extern struct block_device_operations dasd_device_operations;
extern struct kmem_cache *dasd_page_cache;
struct dasd_ccw_req *
dasd_kmalloc_request(char *, int, int, struct dasd_device *);
struct dasd_ccw_req *
dasd_smalloc_request(char *, int, int, struct dasd_device *);
void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
static inline int
dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
{
return set_normalized_cda(ccw, cda);
}
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 *);
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_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_immediatly(struct dasd_ccw_req *);
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_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);
void dasd_generic_handle_state_change(struct dasd_device *);
int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int);
/* externals in dasd_devmap.c */
extern int dasd_max_devindex;
extern int dasd_probeonly;
extern int dasd_autodetect;
extern int dasd_nopav;
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_uid(struct ccw_device *, struct dasd_uid *);
int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
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);
int dasd_parse(void);
int dasd_busid_known(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 inode *, struct file *, unsigned int, unsigned long);
long dasd_compat_ioctl(struct file *, 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 *);
/* externals in dasd_3990_erp.c */
struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
/* 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 */
#endif /* __KERNEL__ */
#endif /* DASD_H */
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