diff options
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
| -rw-r--r-- | drivers/s390/block/dasd_int.h | 1254 |
1 files changed, 1254 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h new file mode 100644 index 000000000..de6b96036 --- /dev/null +++ b/drivers/s390/block/dasd_int.h @@ -0,0 +1,1254 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> + * Horst Hummel <Horst.Hummel@de.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + * Bugreports.to..: <Linux390@de.ibm.com> + * Copyright IBM Corp. 1999, 2009 + */ + +#ifndef DASD_INT_H +#define DASD_INT_H + +/* we keep old device allocation scheme; IOW, minors are still in 0..255 */ +#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) +#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) + +/* + * States a dasd device can have: + * new: the dasd_device structure is allocated. + * known: the discipline for the device is identified. + * basic: the device can do basic i/o. + * unfmt: the device could not be analyzed (format is unknown). + * ready: partition detection is done and the device is can do block io. + * online: the device accepts requests from the block device queue. + * + * Things to do for startup state transitions: + * new -> known: find discipline for the device and create devfs entries. + * known -> basic: request irq line for the device. + * basic -> ready: do the initial analysis, e.g. format detection, + * do block device setup and detect partitions. + * ready -> online: schedule the device tasklet. + * Things to do for shutdown state transitions: + * online -> ready: just set the new device state. + * ready -> basic: flush requests from the block device layer, clear + * partition information and reset format information. + * basic -> known: terminate all requests and free irq. + * known -> new: remove devfs entries and forget discipline. + */ + +#define DASD_STATE_NEW 0 +#define DASD_STATE_KNOWN 1 +#define DASD_STATE_BASIC 2 +#define DASD_STATE_UNFMT 3 +#define DASD_STATE_READY 4 +#define DASD_STATE_ONLINE 5 + +#include <linux/module.h> +#include <linux/wait.h> +#include <linux/blkdev.h> +#include <linux/genhd.h> +#include <linux/hdreg.h> +#include <linux/interrupt.h> +#include <linux/log2.h> +#include <asm/ccwdev.h> +#include <linux/workqueue.h> +#include <asm/debug.h> +#include <asm/dasd.h> +#include <asm/idals.h> +#include <linux/bitops.h> +#include <linux/blk-mq.h> + +/* DASD discipline magic */ +#define DASD_ECKD_MAGIC 0xC5C3D2C4 +#define DASD_DIAG_MAGIC 0xC4C9C1C7 +#define DASD_FBA_MAGIC 0xC6C2C140 + +/* + * SECTION: Type definitions + */ +struct dasd_device; +struct dasd_block; + +/* BIT DEFINITIONS FOR SENSE DATA */ +#define DASD_SENSE_BIT_0 0x80 +#define DASD_SENSE_BIT_1 0x40 +#define DASD_SENSE_BIT_2 0x20 +#define DASD_SENSE_BIT_3 0x10 + +/* BIT DEFINITIONS FOR SIM SENSE */ +#define DASD_SIM_SENSE 0x0F +#define DASD_SIM_MSG_TO_OP 0x03 +#define DASD_SIM_LOG 0x0C + +/* lock class for nested cdev lock */ +#define CDEV_NESTED_FIRST 1 +#define CDEV_NESTED_SECOND 2 + +/* + * SECTION: MACROs for klogd and s390 debug feature (dbf) + */ +#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ +do { \ + debug_sprintf_event(d_device->debug_area, \ + d_level, \ + d_str "\n", \ + d_data); \ +} while(0) + +#define DBF_EVENT(d_level, d_str, d_data...)\ +do { \ + debug_sprintf_event(dasd_debug_area, \ + d_level,\ + d_str "\n", \ + d_data); \ +} while(0) + +#define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ +do { \ + struct ccw_dev_id __dev_id; \ + ccw_device_get_id(d_cdev, &__dev_id); \ + debug_sprintf_event(dasd_debug_area, \ + d_level, \ + "0.%x.%04x " d_str "\n", \ + __dev_id.ssid, __dev_id.devno, d_data); \ +} while (0) + +/* limit size for an errorstring */ +#define ERRORLENGTH 30 + +/* definition of dbf debug levels */ +#define DBF_EMERG 0 /* system is unusable */ +#define DBF_ALERT 1 /* action must be taken immediately */ +#define DBF_CRIT 2 /* critical conditions */ +#define DBF_ERR 3 /* error conditions */ +#define DBF_WARNING 4 /* warning conditions */ +#define DBF_NOTICE 5 /* normal but significant condition */ +#define DBF_INFO 6 /* informational */ +#define DBF_DEBUG 6 /* debug-level messages */ + +/* messages to be written via klogd and dbf */ +#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ + dev_name(&d_device->cdev->dev), d_args); \ + DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ +} while(0) + +#define MESSAGE(d_loglevel,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ + DBF_EVENT(DBF_ALERT, d_string, d_args); \ +} while(0) + +/* messages to be written via klogd only */ +#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ + dev_name(&d_device->cdev->dev), d_args); \ +} while(0) + +#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ +do { \ + printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ +} while(0) + +/* Macro to calculate number of blocks per page */ +#define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize) + +struct dasd_ccw_req { + unsigned int magic; /* Eye catcher */ + int intrc; /* internal error, e.g. from start_IO */ + struct list_head devlist; /* for dasd_device request queue */ + struct list_head blocklist; /* for dasd_block request queue */ + struct dasd_block *block; /* the originating block device */ + struct dasd_device *memdev; /* the device used to allocate this */ + struct dasd_device *startdev; /* device the request is started on */ + struct dasd_device *basedev; /* base device if no block->base */ + void *cpaddr; /* address of ccw or tcw */ + short retries; /* A retry counter */ + unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ + char status; /* status of this request */ + char lpm; /* logical path mask */ + unsigned long flags; /* flags of this request */ + struct dasd_queue *dq; + unsigned long starttime; /* jiffies time of request start */ + unsigned long expires; /* expiration period in jiffies */ + void *data; /* pointer to data area */ + struct irb irb; /* device status in case of an error */ + struct dasd_ccw_req *refers; /* ERP-chain queueing. */ + void *function; /* originating ERP action */ + void *mem_chunk; + + unsigned long buildclk; /* TOD-clock of request generation */ + unsigned long startclk; /* TOD-clock of request start */ + unsigned long stopclk; /* TOD-clock of request interrupt */ + unsigned long endclk; /* TOD-clock of request termination */ + + void (*callback)(struct dasd_ccw_req *, void *data); + void *callback_data; +}; + +/* + * dasd_ccw_req -> status can be: + */ +#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ +#define DASD_CQR_DONE 0x01 /* request is completed successfully */ +#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ +#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ +#define DASD_CQR_FAILED 0x04 /* request is finally failed */ +#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ + +#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ +#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ +#define DASD_CQR_ERROR 0x82 /* request is completed with error */ +#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ +#define DASD_CQR_CLEARED 0x84 /* request was cleared */ +#define DASD_CQR_SUCCESS 0x85 /* request was successful */ + +/* default expiration time*/ +#define DASD_EXPIRES 300 +#define DASD_EXPIRES_MAX 40000000 +#define DASD_RETRIES 256 +#define DASD_RETRIES_MAX 32768 + +/* per dasd_ccw_req flags */ +#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ +#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ +#define DASD_CQR_VERIFY_PATH 2 /* path verification request */ +#define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was + * stolen. Should not be combined with + * DASD_CQR_FLAGS_USE_ERP + */ +/* + * The following flags are used to suppress output of certain errors. + */ +#define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */ +#define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/ +#define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */ +#define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */ + +#define DASD_REQ_PER_DEV 4 + +/* Signature for error recovery functions. */ +typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); + +/* + * A single CQR can only contain a maximum of 255 CCWs. It is limited by + * the locate record and locate record extended count value which can only hold + * 1 Byte max. + */ +#define DASD_CQR_MAX_CCW 255 + +/* + * Unique identifier for dasd device. + */ +#define UA_NOT_CONFIGURED 0x00 +#define UA_BASE_DEVICE 0x01 +#define UA_BASE_PAV_ALIAS 0x02 +#define UA_HYPER_PAV_ALIAS 0x03 + +struct dasd_uid { + __u8 type; + char vendor[4]; + char serial[15]; + __u16 ssid; + __u8 real_unit_addr; + __u8 base_unit_addr; + char vduit[33]; +}; + +/* + * the struct dasd_discipline is + * sth like a table of virtual functions, if you think of dasd_eckd + * inheriting dasd... + * no, currently we are not planning to reimplement the driver in C++ + */ +struct dasd_discipline { + struct module *owner; + char ebcname[8]; /* a name used for tagging and printks */ + char name[8]; /* a name used for tagging and printks */ + 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 + * formats the device and check_device_format compares the format of + * a device with the expected format_data. + * handle_terminated_request allows to examine a cqr and prepare + * it for retry. + */ + struct dasd_ccw_req *(*build_cp) (struct dasd_device *, + struct dasd_block *, + struct request *); + int (*start_IO) (struct dasd_ccw_req *); + int (*term_IO) (struct dasd_ccw_req *); + void (*handle_terminated_request) (struct dasd_ccw_req *); + int (*format_device) (struct dasd_device *, + struct format_data_t *, int); + int (*check_device_format)(struct dasd_device *, + struct format_check_t *, int); + int (*free_cp) (struct dasd_ccw_req *, struct request *); + + /* + * Error recovery functions. examine_error() returns a value that + * indicates what to do for an error condition. If examine_error() + * returns 'dasd_era_recover' erp_action() is called to create a + * special error recovery ccw. erp_postaction() is called after + * an error recovery ccw has finished its execution. dump_sense + * is called for every error condition to print the sense data + * to the console. + */ + dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); + dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); + void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, + struct irb *); + void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); + void (*check_for_device_change) (struct dasd_device *, + struct dasd_ccw_req *, + struct irb *); + + /* i/o control functions. */ + int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); + int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); + int (*ioctl) (struct dasd_block *, unsigned int, void __user *); + + /* suspend/resume functions */ + int (*freeze) (struct dasd_device *); + int (*restore) (struct dasd_device *); + + /* reload device after state change */ + int (*reload) (struct dasd_device *); + + int (*get_uid) (struct dasd_device *, struct dasd_uid *); + void (*kick_validate) (struct dasd_device *); + int (*check_attention)(struct dasd_device *, __u8); + int (*host_access_count)(struct dasd_device *); + int (*hosts_print)(struct dasd_device *, struct seq_file *); + void (*handle_hpf_error)(struct dasd_device *, struct irb *); + void (*disable_hpf)(struct dasd_device *); + int (*hpf_enabled)(struct dasd_device *); + void (*reset_path)(struct dasd_device *, __u8); +}; + +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 + +/* DASD path handling */ + +#define DASD_PATH_OPERATIONAL 1 +#define DASD_PATH_TBV 2 +#define DASD_PATH_PP 3 +#define DASD_PATH_NPP 4 +#define DASD_PATH_MISCABLED 5 +#define DASD_PATH_NOHPF 6 +#define DASD_PATH_CUIR 7 +#define DASD_PATH_IFCC 8 + +#define DASD_THRHLD_MAX 4294967295U +#define DASD_INTERVAL_MAX 4294967295U + +struct dasd_path { + unsigned long flags; + u8 cssid; + u8 ssid; + u8 chpid; + struct dasd_conf_data *conf_data; + atomic_t error_count; + unsigned long errorclk; +}; + + +struct dasd_profile_info { + /* legacy part of profile data, as in dasd_profile_info_t */ + unsigned int dasd_io_reqs; /* number of requests processed */ + unsigned int dasd_io_sects; /* number of sectors processed */ + unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ + unsigned int dasd_io_times[32]; /* histogram of requests's times */ + unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ + unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ + unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ + unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ + unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ + unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ + + /* new data */ + struct timespec64 starttod; /* time of start or last reset */ + unsigned int dasd_io_alias; /* requests using an alias */ + unsigned int dasd_io_tpm; /* requests using transport mode */ + unsigned int dasd_read_reqs; /* total number of read requests */ + unsigned int dasd_read_sects; /* total number read sectors */ + unsigned int dasd_read_alias; /* read request using an alias */ + unsigned int dasd_read_tpm; /* read requests in transport mode */ + unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ + unsigned int dasd_read_times[32]; /* histogram of requests's times */ + unsigned int dasd_read_time1[32]; /* hist. time from build to start */ + unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ + unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ + unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ + unsigned long dasd_sum_times; /* sum of request times */ + unsigned long dasd_sum_time_str; /* sum of time from build to start */ + unsigned long dasd_sum_time_irq; /* sum of time from start to irq */ + unsigned long dasd_sum_time_end; /* sum of time from irq to end */ +}; + +struct dasd_profile { + struct dentry *dentry; + struct dasd_profile_info *data; + spinlock_t lock; +}; + +struct dasd_device { + /* Block device stuff. */ + struct dasd_block *block; + + unsigned int devindex; + unsigned long flags; /* per device flags */ + unsigned short features; /* copy of devmap-features (read-only!) */ + + /* extended error reporting stuff (eer) */ + struct dasd_ccw_req *eer_cqr; + + /* Device discipline stuff. */ + struct dasd_discipline *discipline; + struct dasd_discipline *base_discipline; + void *private; + struct dasd_path path[8]; + __u8 opm; + + /* Device state and target state. */ + int state, target; + struct mutex state_mutex; + int stopped; /* device (ccw_device_start) was stopped */ + + /* reference count. */ + atomic_t ref_count; + + /* ccw queue and memory for static ccw/erp buffers. */ + struct list_head ccw_queue; + spinlock_t mem_lock; + void *ccw_mem; + void *erp_mem; + 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 work_struct suc_work; + struct work_struct requeue_requests; + struct timer_list timer; + + debug_info_t *debug_area; + + struct ccw_device *cdev; + + /* hook for alias management */ + struct list_head alias_list; + + /* default expiration time in s */ + unsigned long default_expires; + unsigned long default_retries; + + unsigned long blk_timeout; + + unsigned long path_thrhld; + unsigned long path_interval; + + struct dentry *debugfs_dentry; + struct dentry *hosts_dentry; + struct dasd_profile profile; +}; + +struct dasd_block { + /* Block device stuff. */ + struct gendisk *gdp; + struct request_queue *request_queue; + spinlock_t request_queue_lock; + struct blk_mq_tag_set tag_set; + struct block_device *bdev; + atomic_t open_count; + + unsigned long blocks; /* size of volume in blocks */ + unsigned int bp_block; /* bytes per block */ + unsigned int s2b_shift; /* log2 (bp_block/512) */ + + struct dasd_device *base; + struct list_head ccw_queue; + spinlock_t queue_lock; + + atomic_t tasklet_scheduled; + struct tasklet_struct tasklet; + struct timer_list timer; + + struct dentry *debugfs_dentry; + struct dasd_profile profile; +}; + +struct dasd_attention_data { + struct dasd_device *device; + __u8 lpum; +}; + +struct dasd_queue { + spinlock_t lock; +}; + +/* reasons why device (ccw_device_start) was stopped */ +#define DASD_STOPPED_NOT_ACC 1 /* not accessible */ +#define DASD_STOPPED_QUIESCE 2 /* Quiesced */ +#define DASD_STOPPED_PENDING 4 /* long busy */ +#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ +#define DASD_STOPPED_SU 16 /* summary unit check handling */ +#define DASD_STOPPED_PM 32 /* pm state transition */ +#define DASD_UNRESUMED_PM 64 /* pm resume failed state */ + +/* per device flags */ +#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ +#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ +#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ +#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't + * confuse this with the user specified + * read-only feature. + */ +#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ +#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ +#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ +#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ +#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ +#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ +#define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ +#define DASD_FLAG_SUC 14 /* unhandled summary unit check */ + +#define DASD_SLEEPON_START_TAG ((void *) 1) +#define DASD_SLEEPON_END_TAG ((void *) 2) + +void dasd_put_device_wake(struct dasd_device *); + +/* + * Reference count inliners + */ +static inline void +dasd_get_device(struct dasd_device *device) +{ + atomic_inc(&device->ref_count); +} + +static inline void +dasd_put_device(struct dasd_device *device) +{ + if (atomic_dec_return(&device->ref_count) == 0) + dasd_put_device_wake(device); +} + +/* + * The static memory in ccw_mem and erp_mem is managed by a sorted + * list of free memory chunks. + */ +struct dasd_mchunk +{ + struct list_head list; + unsigned long size; +} __attribute__ ((aligned(8))); + +static inline void +dasd_init_chunklist(struct list_head *chunk_list, void *mem, + unsigned long size) +{ + struct dasd_mchunk *chunk; + + INIT_LIST_HEAD(chunk_list); + chunk = (struct dasd_mchunk *) mem; + chunk->size = size - sizeof(struct dasd_mchunk); + list_add(&chunk->list, chunk_list); +} + +static inline void * +dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) +{ + struct dasd_mchunk *chunk, *tmp; + + size = (size + 7L) & -8L; + list_for_each_entry(chunk, chunk_list, list) { + if (chunk->size < size) + continue; + if (chunk->size > size + sizeof(struct dasd_mchunk)) { + char *endaddr = (char *) (chunk + 1) + chunk->size; + tmp = (struct dasd_mchunk *) (endaddr - size) - 1; + tmp->size = size; + chunk->size -= size + sizeof(struct dasd_mchunk); + chunk = tmp; + } else + list_del(&chunk->list); + return (void *) (chunk + 1); + } + return NULL; +} + +static inline void +dasd_free_chunk(struct list_head *chunk_list, void *mem) +{ + struct dasd_mchunk *chunk, *tmp; + struct list_head *p, *left; + + chunk = (struct dasd_mchunk *) + ((char *) mem - sizeof(struct dasd_mchunk)); + /* Find out the left neighbour in chunk_list. */ + left = chunk_list; + list_for_each(p, chunk_list) { + if (list_entry(p, struct dasd_mchunk, list) > chunk) + break; + left = p; + } + /* Try to merge with right neighbour = next element from left. */ + if (left->next != chunk_list) { + tmp = list_entry(left->next, struct dasd_mchunk, list); + if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { + list_del(&tmp->list); + chunk->size += tmp->size + sizeof(struct dasd_mchunk); + } + } + /* Try to merge with left neighbour. */ + if (left != chunk_list) { + tmp = list_entry(left, struct dasd_mchunk, list); + if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { + tmp->size += chunk->size + sizeof(struct dasd_mchunk); + return; + } + } + __list_add(&chunk->list, left, left->next); +} + +/* + * Check if bsize is in { 512, 1024, 2048, 4096 } + */ +static inline int +dasd_check_blocksize(int bsize) +{ + if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) + return -EMEDIUMTYPE; + return 0; +} + +/* externals in dasd.c */ +#define DASD_PROFILE_OFF 0 +#define DASD_PROFILE_ON 1 +#define DASD_PROFILE_GLOBAL_ONLY 2 + +extern debug_info_t *dasd_debug_area; +extern struct dasd_profile dasd_global_profile; +extern unsigned int dasd_global_profile_level; +extern const struct block_device_operations dasd_device_operations; + +extern struct kmem_cache *dasd_page_cache; + +struct dasd_ccw_req * +dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *); +void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); +void dasd_wakeup_cb(struct dasd_ccw_req *, void *); + +struct dasd_device *dasd_alloc_device(void); +void dasd_free_device(struct dasd_device *); + +struct dasd_block *dasd_alloc_block(void); +void dasd_free_block(struct dasd_block *); + +enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved); + +void dasd_enable_device(struct dasd_device *); +void dasd_set_target_state(struct dasd_device *, int); +void dasd_kick_device(struct dasd_device *); +void dasd_restore_device(struct dasd_device *); +void dasd_reload_device(struct dasd_device *); +void dasd_schedule_requeue(struct dasd_device *); + +void dasd_add_request_head(struct dasd_ccw_req *); +void dasd_add_request_tail(struct dasd_ccw_req *); +int dasd_start_IO(struct dasd_ccw_req *); +int dasd_term_IO(struct dasd_ccw_req *); +void dasd_schedule_device_bh(struct dasd_device *); +void dasd_schedule_block_bh(struct dasd_block *); +int dasd_sleep_on(struct dasd_ccw_req *); +int dasd_sleep_on_queue(struct list_head *); +int dasd_sleep_on_immediatly(struct dasd_ccw_req *); +int dasd_sleep_on_interruptible(struct dasd_ccw_req *); +void dasd_device_set_timer(struct dasd_device *, int); +void dasd_device_clear_timer(struct dasd_device *); +void dasd_block_set_timer(struct dasd_block *, int); +void dasd_block_clear_timer(struct dasd_block *); +int dasd_cancel_req(struct dasd_ccw_req *); +int dasd_flush_device_queue(struct dasd_device *); +int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); +void dasd_generic_free_discipline(struct dasd_device *); +void dasd_generic_remove (struct ccw_device *cdev); +int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); +int dasd_generic_set_offline (struct ccw_device *cdev); +int dasd_generic_notify(struct ccw_device *, int); +int dasd_generic_last_path_gone(struct dasd_device *); +int dasd_generic_path_operational(struct dasd_device *); +void dasd_generic_shutdown(struct ccw_device *); + +void dasd_generic_handle_state_change(struct dasd_device *); +int dasd_generic_pm_freeze(struct ccw_device *); +int dasd_generic_restore_device(struct ccw_device *); +enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); +void dasd_generic_path_event(struct ccw_device *, int *); +int dasd_generic_verify_path(struct dasd_device *, __u8); + +int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); +char *dasd_get_sense(struct irb *); + +void dasd_device_set_stop_bits(struct dasd_device *, int); +void dasd_device_remove_stop_bits(struct dasd_device *, int); + +int dasd_device_is_ro(struct dasd_device *); + +void dasd_profile_reset(struct dasd_profile *); +int dasd_profile_on(struct dasd_profile *); +void dasd_profile_off(struct dasd_profile *); +char *dasd_get_user_string(const char __user *, size_t); + +/* externals in dasd_devmap.c */ +extern int dasd_max_devindex; +extern int dasd_probeonly; +extern int dasd_autodetect; +extern int dasd_nopav; +extern int dasd_nofcx; + +int dasd_devmap_init(void); +void dasd_devmap_exit(void); + +struct dasd_device *dasd_create_device(struct ccw_device *); +void dasd_delete_device(struct dasd_device *); + +int dasd_get_feature(struct ccw_device *, int); +int dasd_set_feature(struct ccw_device *, int, int); + +int dasd_add_sysfs_files(struct ccw_device *); +void dasd_remove_sysfs_files(struct ccw_device *); + +struct dasd_device *dasd_device_from_cdev(struct ccw_device *); +struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); +struct dasd_device *dasd_device_from_devindex(int); + +void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); +struct dasd_device *dasd_device_from_gendisk(struct gendisk *); + +int dasd_parse(void) __init; +int dasd_busid_known(const char *); + +/* externals in dasd_gendisk.c */ +int dasd_gendisk_init(void); +void dasd_gendisk_exit(void); +int dasd_gendisk_alloc(struct dasd_block *); +void dasd_gendisk_free(struct dasd_block *); +int dasd_scan_partitions(struct dasd_block *); +void dasd_destroy_partitions(struct dasd_block *); + +/* externals in dasd_ioctl.c */ +int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); + +/* externals in dasd_proc.c */ +int dasd_proc_init(void); +void dasd_proc_exit(void); + +/* externals in dasd_erp.c */ +struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); +struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); +struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, + struct dasd_device *); +void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); +void dasd_log_sense(struct dasd_ccw_req *, struct irb *); +void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); + +/* externals in dasd_3990_erp.c */ +struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); +void dasd_3990_erp_handle_sim(struct dasd_device *, char *); + +/* externals in dasd_eer.c */ +#ifdef CONFIG_DASD_EER +int dasd_eer_init(void); +void dasd_eer_exit(void); +int dasd_eer_enable(struct dasd_device *); +void dasd_eer_disable(struct dasd_device *); +void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, + unsigned int id); +void dasd_eer_snss(struct dasd_device *); + +static inline int dasd_eer_enabled(struct dasd_device *device) +{ + return device->eer_cqr != NULL; +} +#else +#define dasd_eer_init() (0) +#define dasd_eer_exit() do { } while (0) +#define dasd_eer_enable(d) (0) +#define dasd_eer_disable(d) do { } while (0) +#define dasd_eer_write(d,c,i) do { } while (0) +#define dasd_eer_snss(d) do { } while (0) +#define dasd_eer_enabled(d) (0) +#endif /* CONFIG_DASD_ERR */ + + +/* DASD path handling functions */ + +/* + * helper functions to modify bit masks for a given channel path for a device + */ +static inline int dasd_path_is_operational(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); +} + +static inline int dasd_path_need_verify(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_TBV, &device->path[chp].flags); +} + +static inline void dasd_path_verify(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_TBV, &device->path[chp].flags); +} + +static inline void dasd_path_clear_verify(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_TBV, &device->path[chp].flags); +} + +static inline void dasd_path_clear_all_verify(struct dasd_device *device) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + dasd_path_clear_verify(device, chp); +} + +static inline void dasd_path_operational(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); + device->opm |= (0x80 >> chp); +} + +static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_NPP, &device->path[chp].flags); +} + +static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_NPP, &device->path[chp].flags); +} + +static inline void dasd_path_clear_nonpreferred(struct dasd_device *device, + int chp) +{ + __clear_bit(DASD_PATH_NPP, &device->path[chp].flags); +} + +static inline void dasd_path_preferred(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_PP, &device->path[chp].flags); +} + +static inline int dasd_path_is_preferred(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_PP, &device->path[chp].flags); +} + +static inline void dasd_path_clear_preferred(struct dasd_device *device, + int chp) +{ + __clear_bit(DASD_PATH_PP, &device->path[chp].flags); +} + +static inline void dasd_path_clear_oper(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); + device->opm &= ~(0x80 >> chp); +} + +static inline void dasd_path_clear_cable(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); +} + +static inline void dasd_path_cuir(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_CUIR, &device->path[chp].flags); +} + +static inline int dasd_path_is_cuir(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_CUIR, &device->path[chp].flags); +} + +static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags); +} + +static inline void dasd_path_ifcc(struct dasd_device *device, int chp) +{ + set_bit(DASD_PATH_IFCC, &device->path[chp].flags); +} + +static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_IFCC, &device->path[chp].flags); +} + +static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp) +{ + clear_bit(DASD_PATH_IFCC, &device->path[chp].flags); +} + +static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp) +{ + __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags); +} + +static inline void dasd_path_miscabled(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); +} + +static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); +} + +static inline void dasd_path_nohpf(struct dasd_device *device, int chp) +{ + __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags); +} + +static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp) +{ + return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags); +} + +/* + * get functions for path masks + * will return a path masks for the given device + */ + +static inline __u8 dasd_path_get_opm(struct dasd_device *device) +{ + return device->opm; +} + +static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device) +{ + int chp; + __u8 tbvpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_need_verify(device, chp)) + tbvpm |= 0x80 >> chp; + return tbvpm; +} + +static inline __u8 dasd_path_get_nppm(struct dasd_device *device) +{ + int chp; + __u8 npm = 0x00; + + for (chp = 0; chp < 8; chp++) { + if (dasd_path_is_nonpreferred(device, chp)) + npm |= 0x80 >> chp; + } + return npm; +} + +static inline __u8 dasd_path_get_ppm(struct dasd_device *device) +{ + int chp; + __u8 ppm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_preferred(device, chp)) + ppm |= 0x80 >> chp; + return ppm; +} + +static inline __u8 dasd_path_get_cablepm(struct dasd_device *device) +{ + int chp; + __u8 cablepm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_miscabled(device, chp)) + cablepm |= 0x80 >> chp; + return cablepm; +} + +static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device) +{ + int chp; + __u8 cuirpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_cuir(device, chp)) + cuirpm |= 0x80 >> chp; + return cuirpm; +} + +static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device) +{ + int chp; + __u8 ifccpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_ifcc(device, chp)) + ifccpm |= 0x80 >> chp; + return ifccpm; +} + +static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device) +{ + int chp; + __u8 hpfpm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_nohpf(device, chp)) + hpfpm |= 0x80 >> chp; + return hpfpm; +} + +/* + * add functions for path masks + * the existing path mask will be extended by the given path mask + */ +static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_verify(device, chp); +} + +static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device) +{ + int chp; + __u8 nopm = 0x00; + + for (chp = 0; chp < 8; chp++) + if (dasd_path_is_nohpf(device, chp) || + dasd_path_is_ifcc(device, chp) || + dasd_path_is_cuir(device, chp) || + dasd_path_is_miscabled(device, chp)) + nopm |= 0x80 >> chp; + return nopm; +} + +static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) { + dasd_path_operational(device, chp); + /* + * if the path is used + * it should not be in one of the negative lists + */ + dasd_path_clear_nohpf(device, chp); + dasd_path_clear_cuir(device, chp); + dasd_path_clear_cable(device, chp); + dasd_path_clear_ifcc(device, chp); + } +} + +static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_miscabled(device, chp); +} + +static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_cuir(device, chp); +} + +static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_ifcc(device, chp); +} + +static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_nonpreferred(device, chp); +} + +static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_nohpf(device, chp); +} + +static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_preferred(device, chp); +} + +/* + * set functions for path masks + * the existing path mask will be replaced by the given path mask + */ +static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + if (pm & (0x80 >> chp)) + dasd_path_verify(device, chp); + else + dasd_path_clear_verify(device, chp); +} + +static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) { + dasd_path_clear_oper(device, chp); + if (pm & (0x80 >> chp)) { + dasd_path_operational(device, chp); + /* + * if the path is used + * it should not be in one of the negative lists + */ + dasd_path_clear_nohpf(device, chp); + dasd_path_clear_cuir(device, chp); + dasd_path_clear_cable(device, chp); + dasd_path_clear_ifcc(device, chp); + } + } +} + +/* + * remove functions for path masks + * the existing path mask will be cleared with the given path mask + */ +static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm) +{ + int chp; + + for (chp = 0; chp < 8; chp++) { + if (pm & (0x80 >> chp)) + dasd_path_clear_oper(device, chp); + } +} + +/* + * add the newly available path to the to be verified pm and remove it from + * normal operation until it is verified + */ +static inline void dasd_path_available(struct dasd_device *device, int chp) +{ + dasd_path_clear_oper(device, chp); + dasd_path_verify(device, chp); +} + +static inline void dasd_path_notoper(struct dasd_device *device, int chp) +{ + dasd_path_clear_oper(device, chp); + dasd_path_clear_preferred(device, chp); + dasd_path_clear_nonpreferred(device, chp); +} + +/* + * remove all paths from normal operation + */ +static inline void dasd_path_no_path(struct dasd_device *device) +{ + int chp; + + for (chp = 0; chp < 8; chp++) + dasd_path_notoper(device, chp); + + dasd_path_clear_all_verify(device); +} + +/* end - path handling */ + +#endif /* DASD_H */ |