| /* |
| * 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> |
| |
| /* 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_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_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) |
| |
| #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) |
| |
| /* 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) |
| |
| 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 */ |
| void *cpaddr; /* address of ccw or tcw */ |
| unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ |
| 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 */ |
| unsigned long expires; /* expiration period in jiffies */ |
| char lpm; /* logical path mask */ |
| void *data; /* pointer to data area */ |
| |
| /* these are important for recovering erroneous requests */ |
| int intrc; /* internal error, e.g. from start_IO */ |
| 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 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 |
| */ |
| |
| /* Signature for error recovery functions. */ |
| typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); |
| |
| /* |
| * 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 */ |
| 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 *); |
| |
| /* |
| * 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 *); |
| |
| /* (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 *); |
| int (*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 (*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 *); |
| }; |
| |
| 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 |
| |
| struct dasd_path { |
| __u8 opm; |
| __u8 tbvpm; |
| __u8 ppm; |
| __u8 npm; |
| }; |
| |
| 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 timespec 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 */ |
| }; |
| |
| struct dasd_profile { |
| struct dentry *dentry; |
| struct dasd_profile_info *data; |
| spinlock_t lock; |
| }; |
| |
| 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; |
| struct dasd_path path_data; |
| |
| /* 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; |
| struct list_head ccw_chunks; |
| struct list_head erp_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 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; |
| |
| struct dentry *debugfs_dentry; |
| struct dasd_profile profile; |
| }; |
| |
| 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 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; |
| }; |
| |
| |
| |
| /* 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 */ |
| |
| /* 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_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_info dasd_global_profile_data; |
| 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_kmalloc_request(int , int, int, struct dasd_device *); |
| struct dasd_ccw_req * |
| dasd_smalloc_request(int , 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 *); |
| void dasd_wakeup_cb(struct dasd_ccw_req *, void *); |
| |
| 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 *); |
| |
| enum blk_eh_timer_return dasd_times_out(struct request *req); |
| |
| 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_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_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); |
| 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); |
| |
| 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 *); |
| void dasd_global_profile_reset(void); |
| 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); |
| 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 */ |
| |
| #endif /* DASD_H */ |