608 lines
20 KiB
C
608 lines
20 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd_int.h
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Horst Hummel <Horst.Hummel@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
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*
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*/
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#ifndef DASD_INT_H
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#define DASD_INT_H
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#ifdef __KERNEL__
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/* erp debugging in dasd.c and dasd_3990_erp.c */
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#define ERP_DEBUG
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/* we keep old device allocation scheme; IOW, minors are still in 0..255 */
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#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
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#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
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/*
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* States a dasd device can have:
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* new: the dasd_device structure is allocated.
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* known: the discipline for the device is identified.
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* basic: the device can do basic i/o.
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* unfmt: the device could not be analyzed (format is unknown).
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* ready: partition detection is done and the device is can do block io.
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* online: the device accepts requests from the block device queue.
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*
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* Things to do for startup state transitions:
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* new -> known: find discipline for the device and create devfs entries.
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* known -> basic: request irq line for the device.
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* basic -> ready: do the initial analysis, e.g. format detection,
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* do block device setup and detect partitions.
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* ready -> online: schedule the device tasklet.
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* Things to do for shutdown state transitions:
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* online -> ready: just set the new device state.
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* ready -> basic: flush requests from the block device layer, clear
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* partition information and reset format information.
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* basic -> known: terminate all requests and free irq.
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* known -> new: remove devfs entries and forget discipline.
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*/
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#define DASD_STATE_NEW 0
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#define DASD_STATE_KNOWN 1
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#define DASD_STATE_BASIC 2
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#define DASD_STATE_UNFMT 3
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#define DASD_STATE_READY 4
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#define DASD_STATE_ONLINE 5
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#include <linux/module.h>
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#include <linux/wait.h>
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#include <linux/blkdev.h>
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#include <linux/genhd.h>
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#include <linux/hdreg.h>
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#include <linux/interrupt.h>
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#include <asm/ccwdev.h>
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#include <linux/workqueue.h>
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#include <asm/debug.h>
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#include <asm/dasd.h>
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#include <asm/idals.h>
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/*
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* SECTION: Type definitions
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*/
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struct dasd_device;
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typedef enum {
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dasd_era_fatal = -1, /* no chance to recover */
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dasd_era_none = 0, /* don't recover, everything alright */
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dasd_era_msg = 1, /* don't recover, just report... */
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dasd_era_recover = 2 /* recovery action recommended */
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} dasd_era_t;
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/* BIT DEFINITIONS FOR SENSE DATA */
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#define DASD_SENSE_BIT_0 0x80
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#define DASD_SENSE_BIT_1 0x40
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#define DASD_SENSE_BIT_2 0x20
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#define DASD_SENSE_BIT_3 0x10
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/*
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* SECTION: MACROs for klogd and s390 debug feature (dbf)
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*/
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#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
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do { \
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debug_sprintf_event(d_device->debug_area, \
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d_level, \
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d_str "\n", \
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d_data); \
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} while(0)
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#define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
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do { \
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debug_sprintf_exception(d_device->debug_area, \
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d_level, \
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d_str "\n", \
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d_data); \
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} while(0)
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#define DBF_EVENT(d_level, d_str, d_data...)\
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do { \
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debug_sprintf_event(dasd_debug_area, \
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d_level,\
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d_str "\n", \
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d_data); \
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} while(0)
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#define DBF_EXC(d_level, d_str, d_data...)\
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do { \
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debug_sprintf_exception(dasd_debug_area, \
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d_level,\
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d_str "\n", \
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d_data); \
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} while(0)
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/* definition of dbf debug levels */
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#define DBF_EMERG 0 /* system is unusable */
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#define DBF_ALERT 1 /* action must be taken immediately */
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#define DBF_CRIT 2 /* critical conditions */
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#define DBF_ERR 3 /* error conditions */
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#define DBF_WARNING 4 /* warning conditions */
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#define DBF_NOTICE 5 /* normal but significant condition */
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#define DBF_INFO 6 /* informational */
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#define DBF_DEBUG 6 /* debug-level messages */
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/* messages to be written via klogd and dbf */
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#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
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do { \
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printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
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d_device->cdev->dev.bus_id, d_args); \
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DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
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} while(0)
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#define MESSAGE(d_loglevel,d_string,d_args...)\
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do { \
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printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
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DBF_EVENT(DBF_ALERT, d_string, d_args); \
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} while(0)
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/* messages to be written via klogd only */
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#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
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do { \
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printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
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d_device->cdev->dev.bus_id, d_args); \
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} while(0)
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#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
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do { \
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printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
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} while(0)
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struct dasd_ccw_req {
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unsigned int magic; /* Eye catcher */
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struct list_head list; /* list_head for request queueing. */
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/* Where to execute what... */
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struct dasd_device *device; /* device the request is for */
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struct ccw1 *cpaddr; /* address of channel program */
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char status; /* status of this request */
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short retries; /* A retry counter */
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unsigned long flags; /* flags of this request */
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/* ... and how */
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unsigned long starttime; /* jiffies time of request start */
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int expires; /* expiration period in jiffies */
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char lpm; /* logical path mask */
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void *data; /* pointer to data area */
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/* these are important for recovering erroneous requests */
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struct irb irb; /* device status in case of an error */
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struct dasd_ccw_req *refers; /* ERP-chain queueing. */
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void *function; /* originating ERP action */
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/* these are for statistics only */
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unsigned long long buildclk; /* TOD-clock of request generation */
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unsigned long long startclk; /* TOD-clock of request start */
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unsigned long long stopclk; /* TOD-clock of request interrupt */
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unsigned long long endclk; /* TOD-clock of request termination */
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/* Callback that is called after reaching final status. */
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void (*callback)(struct dasd_ccw_req *, void *data);
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void *callback_data;
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};
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/*
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* dasd_ccw_req -> status can be:
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*/
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#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
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#define DASD_CQR_QUEUED 0x01 /* request is queued to be processed */
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#define DASD_CQR_IN_IO 0x02 /* request is currently in IO */
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#define DASD_CQR_DONE 0x03 /* request is completed successfully */
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#define DASD_CQR_ERROR 0x04 /* request is completed with error */
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#define DASD_CQR_FAILED 0x05 /* request is finally failed */
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#define DASD_CQR_CLEAR 0x06 /* request is clear pending */
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/* per dasd_ccw_req flags */
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#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
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#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
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/* Signature for error recovery functions. */
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typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
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/*
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* the struct dasd_discipline is
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* sth like a table of virtual functions, if you think of dasd_eckd
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* inheriting dasd...
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* no, currently we are not planning to reimplement the driver in C++
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*/
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struct dasd_discipline {
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struct module *owner;
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char ebcname[8]; /* a name used for tagging and printks */
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char name[8]; /* a name used for tagging and printks */
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int max_blocks; /* maximum number of blocks to be chained */
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struct list_head list; /* used for list of disciplines */
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/*
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* Device recognition functions. check_device is used to verify
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* the sense data and the information returned by read device
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* characteristics. It returns 0 if the discipline can be used
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* for the device in question.
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* do_analysis is used in the step from device state "basic" to
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* state "accept". It returns 0 if the device can be made ready,
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* it returns -EMEDIUMTYPE if the device can't be made ready or
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* -EAGAIN if do_analysis started a ccw that needs to complete
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* before the analysis may be repeated.
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*/
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int (*check_device)(struct dasd_device *);
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int (*do_analysis) (struct dasd_device *);
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/*
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* Device operation functions. build_cp creates a ccw chain for
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* a block device request, start_io starts the request and
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* term_IO cancels it (e.g. in case of a timeout). format_device
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* returns a ccw chain to be used to format the device.
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*/
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struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
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struct request *);
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int (*start_IO) (struct dasd_ccw_req *);
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int (*term_IO) (struct dasd_ccw_req *);
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struct dasd_ccw_req *(*format_device) (struct dasd_device *,
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struct format_data_t *);
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int (*free_cp) (struct dasd_ccw_req *, struct request *);
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/*
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* Error recovery functions. examine_error() returns a value that
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* indicates what to do for an error condition. If examine_error()
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* returns 'dasd_era_recover' erp_action() is called to create a
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* special error recovery ccw. erp_postaction() is called after
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* an error recovery ccw has finished its execution. dump_sense
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* is called for every error condition to print the sense data
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* to the console.
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*/
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dasd_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *);
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dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
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dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
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void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
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struct irb *);
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/* i/o control functions. */
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int (*fill_geometry) (struct dasd_device *, struct hd_geometry *);
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int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
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int (*ioctl) (struct dasd_device *, unsigned int, void __user *);
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};
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extern struct dasd_discipline *dasd_diag_discipline_pointer;
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/*
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* Unique identifier for dasd device.
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*/
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struct dasd_uid {
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__u8 alias;
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char vendor[4];
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char serial[15];
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__u16 ssid;
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__u8 unit_addr;
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};
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/*
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* Notification numbers for extended error reporting notifications:
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* The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
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* eer pointer) is freed. The error reporting module needs to do all necessary
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* cleanup steps.
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* The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
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*/
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#define DASD_EER_DISABLE 0
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#define DASD_EER_TRIGGER 1
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/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
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#define DASD_EER_FATALERROR 1
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#define DASD_EER_NOPATH 2
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#define DASD_EER_STATECHANGE 3
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#define DASD_EER_PPRCSUSPEND 4
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struct dasd_device {
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/* Block device stuff. */
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struct gendisk *gdp;
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request_queue_t *request_queue;
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spinlock_t request_queue_lock;
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struct block_device *bdev;
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unsigned int devindex;
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unsigned long blocks; /* size of volume in blocks */
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unsigned int bp_block; /* bytes per block */
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unsigned int s2b_shift; /* log2 (bp_block/512) */
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unsigned long flags; /* per device flags */
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unsigned short features; /* copy of devmap-features (read-only!) */
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/* extended error reporting stuff (eer) */
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struct dasd_ccw_req *eer_cqr;
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/* Device discipline stuff. */
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struct dasd_discipline *discipline;
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struct dasd_discipline *base_discipline;
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char *private;
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/* Device state and target state. */
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int state, target;
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int stopped; /* device (ccw_device_start) was stopped */
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/* Open and reference count. */
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atomic_t ref_count;
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atomic_t open_count;
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/* ccw queue and memory for static ccw/erp buffers. */
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struct list_head ccw_queue;
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spinlock_t mem_lock;
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void *ccw_mem;
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void *erp_mem;
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struct list_head ccw_chunks;
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struct list_head erp_chunks;
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atomic_t tasklet_scheduled;
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struct tasklet_struct tasklet;
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struct work_struct kick_work;
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struct timer_list timer;
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debug_info_t *debug_area;
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struct ccw_device *cdev;
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#ifdef CONFIG_DASD_PROFILE
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struct dasd_profile_info_t profile;
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#endif
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};
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/* reasons why device (ccw_device_start) was stopped */
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#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
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#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
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#define DASD_STOPPED_PENDING 4 /* long busy */
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#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
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#define DASD_STOPPED_DC_EIO 16 /* disconnected, return -EIO */
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/* per device flags */
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#define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */
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#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
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#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
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#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
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void dasd_put_device_wake(struct dasd_device *);
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/*
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* Reference count inliners
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*/
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static inline void
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dasd_get_device(struct dasd_device *device)
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{
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atomic_inc(&device->ref_count);
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}
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static inline void
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dasd_put_device(struct dasd_device *device)
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{
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if (atomic_dec_return(&device->ref_count) == 0)
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dasd_put_device_wake(device);
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}
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/*
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* The static memory in ccw_mem and erp_mem is managed by a sorted
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* list of free memory chunks.
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*/
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struct dasd_mchunk
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{
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struct list_head list;
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unsigned long size;
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} __attribute__ ((aligned(8)));
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static inline void
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dasd_init_chunklist(struct list_head *chunk_list, void *mem,
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unsigned long size)
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{
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struct dasd_mchunk *chunk;
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INIT_LIST_HEAD(chunk_list);
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chunk = (struct dasd_mchunk *) mem;
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chunk->size = size - sizeof(struct dasd_mchunk);
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list_add(&chunk->list, chunk_list);
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}
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static inline void *
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dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
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{
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struct dasd_mchunk *chunk, *tmp;
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size = (size + 7L) & -8L;
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list_for_each_entry(chunk, chunk_list, list) {
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if (chunk->size < size)
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continue;
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if (chunk->size > size + sizeof(struct dasd_mchunk)) {
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char *endaddr = (char *) (chunk + 1) + chunk->size;
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tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
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tmp->size = size;
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chunk->size -= size + sizeof(struct dasd_mchunk);
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chunk = tmp;
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} else
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list_del(&chunk->list);
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return (void *) (chunk + 1);
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}
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return NULL;
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}
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static inline void
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dasd_free_chunk(struct list_head *chunk_list, void *mem)
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{
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struct dasd_mchunk *chunk, *tmp;
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struct list_head *p, *left;
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chunk = (struct dasd_mchunk *)
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((char *) mem - sizeof(struct dasd_mchunk));
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/* Find out the left neighbour in chunk_list. */
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left = chunk_list;
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list_for_each(p, chunk_list) {
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if (list_entry(p, struct dasd_mchunk, list) > chunk)
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break;
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left = p;
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}
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/* Try to merge with right neighbour = next element from left. */
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if (left->next != chunk_list) {
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tmp = list_entry(left->next, struct dasd_mchunk, list);
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if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
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list_del(&tmp->list);
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chunk->size += tmp->size + sizeof(struct dasd_mchunk);
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}
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}
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/* Try to merge with left neighbour. */
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if (left != chunk_list) {
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tmp = list_entry(left, struct dasd_mchunk, list);
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if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
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tmp->size += chunk->size + sizeof(struct dasd_mchunk);
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return;
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}
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}
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__list_add(&chunk->list, left, left->next);
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}
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/*
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* Check if bsize is in { 512, 1024, 2048, 4096 }
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*/
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static inline int
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dasd_check_blocksize(int bsize)
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{
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if (bsize < 512 || bsize > 4096 || (bsize & (bsize - 1)) != 0)
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return -EMEDIUMTYPE;
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return 0;
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}
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/* externals in dasd.c */
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#define DASD_PROFILE_ON 1
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#define DASD_PROFILE_OFF 0
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extern debug_info_t *dasd_debug_area;
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extern struct dasd_profile_info_t dasd_global_profile;
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extern unsigned int dasd_profile_level;
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extern struct block_device_operations dasd_device_operations;
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extern kmem_cache_t *dasd_page_cache;
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struct dasd_ccw_req *
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dasd_kmalloc_request(char *, int, int, struct dasd_device *);
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struct dasd_ccw_req *
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dasd_smalloc_request(char *, int, int, struct dasd_device *);
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void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
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void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
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static inline int
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dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
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{
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return set_normalized_cda(ccw, cda);
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}
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struct dasd_device *dasd_alloc_device(void);
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void dasd_free_device(struct dasd_device *);
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void dasd_enable_device(struct dasd_device *);
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void dasd_set_target_state(struct dasd_device *, int);
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void dasd_kick_device(struct dasd_device *);
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void dasd_add_request_head(struct dasd_ccw_req *);
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void dasd_add_request_tail(struct dasd_ccw_req *);
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int dasd_start_IO(struct dasd_ccw_req *);
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int dasd_term_IO(struct dasd_ccw_req *);
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void dasd_schedule_bh(struct dasd_device *);
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int dasd_sleep_on(struct dasd_ccw_req *);
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int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
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int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
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void dasd_set_timer(struct dasd_device *, int);
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void dasd_clear_timer(struct dasd_device *);
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int dasd_cancel_req(struct dasd_ccw_req *);
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int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
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void dasd_generic_remove (struct ccw_device *cdev);
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int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
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int dasd_generic_set_offline (struct ccw_device *cdev);
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int dasd_generic_notify(struct ccw_device *, int);
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/* externals in dasd_devmap.c */
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extern int dasd_max_devindex;
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extern int dasd_probeonly;
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extern int dasd_autodetect;
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extern int dasd_nopav;
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int dasd_devmap_init(void);
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void dasd_devmap_exit(void);
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struct dasd_device *dasd_create_device(struct ccw_device *);
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void dasd_delete_device(struct dasd_device *);
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int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
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int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
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int dasd_get_feature(struct ccw_device *, int);
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int dasd_set_feature(struct ccw_device *, int, int);
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int dasd_add_sysfs_files(struct ccw_device *);
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void dasd_remove_sysfs_files(struct ccw_device *);
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struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
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struct dasd_device *dasd_device_from_devindex(int);
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int dasd_parse(void);
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int dasd_busid_known(char *);
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/* externals in dasd_gendisk.c */
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int dasd_gendisk_init(void);
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void dasd_gendisk_exit(void);
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int dasd_gendisk_alloc(struct dasd_device *);
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void dasd_gendisk_free(struct dasd_device *);
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int dasd_scan_partitions(struct dasd_device *);
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void dasd_destroy_partitions(struct dasd_device *);
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/* externals in dasd_ioctl.c */
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int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
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long dasd_compat_ioctl(struct file *, unsigned int, unsigned long);
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/* externals in dasd_proc.c */
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int dasd_proc_init(void);
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void dasd_proc_exit(void);
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/* externals in dasd_erp.c */
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struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
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struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
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struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
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struct dasd_device *);
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void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
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void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
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void dasd_log_ccw(struct dasd_ccw_req *, int, __u32);
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/* externals in dasd_3370_erp.c */
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dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *);
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/* externals in dasd_3990_erp.c */
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dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *);
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struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
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/* externals in dasd_9336_erp.c */
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dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
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/* externals in dasd_9336_erp.c */
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dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
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struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *);
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/* externals in dasd_eer.c */
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#ifdef CONFIG_DASD_EER
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int dasd_eer_init(void);
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void dasd_eer_exit(void);
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int dasd_eer_enable(struct dasd_device *);
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void dasd_eer_disable(struct dasd_device *);
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void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
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unsigned int id);
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void dasd_eer_snss(struct dasd_device *);
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static inline int dasd_eer_enabled(struct dasd_device *device)
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{
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return device->eer_cqr != NULL;
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}
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#else
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#define dasd_eer_init() (0)
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#define dasd_eer_exit() do { } while (0)
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#define dasd_eer_enable(d) (0)
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#define dasd_eer_disable(d) do { } while (0)
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#define dasd_eer_write(d,c,i) do { } while (0)
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#define dasd_eer_snss(d) do { } while (0)
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#define dasd_eer_enabled(d) (0)
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#endif /* CONFIG_DASD_ERR */
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#endif /* __KERNEL__ */
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#endif /* DASD_H */
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