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kernel-ark/drivers/s390/block/dasd_int.h
Horst Hummel 3d05259542 [PATCH] s390: dasd device identifiers 
Generate new sysfs-attribute 'uid' that contains an device specific unique
identifier.  This can be used to identity multiple ALIASES of the same
physical device (PAV).  In addition the sysfs-attributes 'vendor' (containing
the manufacturer of the device) and 'alias' (identify alias or base device) is
added.  This is first part of PAV support in LPAR (also valid on zVM).

Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-04-28 08:33:48 -07:00

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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__
/* erp debugging in dasd.c and dasd_3990_erp.c */
#define ERP_DEBUG
/* 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/devfs_fs_kernel.h>
#include <linux/genhd.h>
#include <linux/hdreg.h>
#include <linux/interrupt.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;
typedef enum {
dasd_era_fatal = -1, /* no chance to recover */
dasd_era_none = 0, /* don't recover, everything alright */
dasd_era_msg = 1, /* don't recover, just report... */
dasd_era_recover = 2 /* recovery action recommended */
} dasd_era_t;
/* 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 list; /* list_head for request queueing. */
/* Where to execute what... */
struct dasd_device *device; /* device the request is for */
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_QUEUED 0x01 /* request is queued to be processed */
#define DASD_CQR_IN_IO 0x02 /* request is currently in IO */
#define DASD_CQR_DONE 0x03 /* request is completed successfully */
#define DASD_CQR_ERROR 0x04 /* request is completed with error */
#define DASD_CQR_FAILED 0x05 /* request is finally failed */
#define DASD_CQR_CLEAR 0x06 /* request is clear pending */
/* 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.
* 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 (*check_device)(struct dasd_device *);
int (*do_analysis) (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.
*/
struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
struct request *);
int (*start_IO) (struct dasd_ccw_req *);
int (*term_IO) (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_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *);
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 *);
/* i/o control functions. */
int (*fill_geometry) (struct dasd_device *, struct hd_geometry *);
int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
int (*ioctl) (struct dasd_device *, unsigned int, void __user *);
};
extern struct dasd_discipline *dasd_diag_discipline_pointer;
/*
* Unique identifier for dasd device.
*/
struct dasd_uid {
__u8 alias;
char vendor[4];
char serial[15];
__u16 ssid;
__u8 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 gendisk *gdp;
request_queue_t *request_queue;
spinlock_t request_queue_lock;
struct block_device *bdev;
unsigned int devindex;
unsigned long blocks; /* size of volume in blocks */
unsigned int bp_block; /* bytes per block */
unsigned int s2b_shift; /* log2 (bp_block/512) */
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 */
/* Open and reference count. */
atomic_t ref_count;
atomic_t open_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;
#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_DC_EIO 16 /* disconnected, return -EIO */
/* per device flags */
#define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */
#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 || (bsize & (bsize - 1)) != 0)
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 kmem_cache_t *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 *);
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_bh(struct dasd_device *);
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_set_timer(struct dasd_device *, int);
void dasd_clear_timer(struct dasd_device *);
int dasd_cancel_req(struct dasd_ccw_req *);
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_auto_online (struct ccw_driver *);
/* externals in dasd_devmap.c */
extern int dasd_max_devindex;
extern int dasd_probeonly;
extern int dasd_autodetect;
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_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_device *);
void dasd_gendisk_free(struct dasd_device *);
int dasd_scan_partitions(struct dasd_device *);
void dasd_destroy_partitions(struct dasd_device *);
/* 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 *);
void dasd_log_ccw(struct dasd_ccw_req *, int, __u32);
/* externals in dasd_3370_erp.c */
dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *);
/* externals in dasd_3990_erp.c */
dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *);
struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
/* externals in dasd_9336_erp.c */
dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
/* externals in dasd_9336_erp.c */
dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
struct dasd_ccw_req *dasd_9343_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 */
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-indent-level: 4
* c-brace-imaginary-offset: 0
* c-brace-offset: -4
* c-argdecl-indent: 4
* c-label-offset: -4
* c-continued-statement-offset: 4
* c-continued-brace-offset: 0
* indent-tabs-mode: 1
* tab-width: 8
* End:
*/
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