| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Stefan Haberland | 2633 | 46.80% | 29 | 30.21% |
| Martin Schwidefsky | 1263 | 22.45% | 12 | 12.50% |
| Stefan Weinhuber | 839 | 14.91% | 9 | 9.38% |
| Linus Torvalds | 323 | 5.74% | 1 | 1.04% |
| Jan Höppner | 294 | 5.23% | 10 | 10.42% |
| Andrew Morton | 77 | 1.37% | 6 | 6.25% |
| Horst Hummel | 72 | 1.28% | 7 | 7.29% |
| Hannes Reinecke | 39 | 0.69% | 3 | 3.12% |
| Christoph Hellwig | 25 | 0.44% | 2 | 2.08% |
| Sebastian Ott | 22 | 0.39% | 4 | 4.17% |
| Cornelia Huck | 15 | 0.27% | 2 | 2.08% |
| Vignesh Babu | 7 | 0.12% | 1 | 1.04% |
| Peter Oberparleiter | 5 | 0.09% | 1 | 1.04% |
| Al Viro | 3 | 0.05% | 2 | 2.08% |
| Christoph Lameter | 2 | 0.04% | 1 | 1.04% |
| Kay Sievers | 2 | 0.04% | 1 | 1.04% |
| Coly Li | 1 | 0.02% | 1 | 1.04% |
| Alexey Dobriyan | 1 | 0.02% | 1 | 1.04% |
| Greg Kroah-Hartman | 1 | 0.02% | 1 | 1.04% |
| Heiko Carstens | 1 | 0.02% | 1 | 1.04% |
| Arnd Bergmann | 1 | 0.02% | 1 | 1.04% |
| Total | 5626 | 96 |
/* 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; unsigned int proc_bytes; /* bytes for partial completion */ }; /* * 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 */ 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 *); /* * Initialize block layer request queue. */ void (*setup_blk_queue)(struct dasd_block *); /* (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); /* * Extent Space Efficient (ESE) relevant functions */ int (*is_ese)(struct dasd_device *); /* Capacity */ int (*space_allocated)(struct dasd_device *); int (*space_configured)(struct dasd_device *); int (*logical_capacity)(struct dasd_device *); int (*release_space)(struct dasd_device *, struct format_data_t *); /* Extent Pool */ int (*ext_pool_id)(struct dasd_device *); int (*ext_size)(struct dasd_device *); int (*ext_pool_cap_at_warnlevel)(struct dasd_device *); int (*ext_pool_warn_thrshld)(struct dasd_device *); int (*ext_pool_oos)(struct dasd_device *); int (*ext_pool_exhaust)(struct dasd_device *, struct dasd_ccw_req *); struct dasd_ccw_req *(*ese_format)(struct dasd_device *, struct dasd_ccw_req *, struct irb *); int (*ese_read)(struct dasd_ccw_req *, struct irb *); }; 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 #define DASD_EER_NOSPC 5 /* 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_format_entry { struct list_head list; sector_t track; }; 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; void *ese_mem; struct list_head ccw_chunks; struct list_head erp_chunks; struct list_head ese_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_format_entry format_entry; }; 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 list_head format_list; spinlock_t format_lock; }; 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 */ #define DASD_STOPPED_NOSPC 128 /* no space left */ /* 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 *); struct dasd_ccw_req *dasd_fmalloc_request(int, int, int, struct dasd_device *); void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); void dasd_ffree_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_queue_interruptible(struct list_head *); 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); void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *); void dasd_generic_space_avail(struct dasd_device *); 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 */
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