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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [s390/] [block/] [dasd.c] - Rev 1275
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/* * File...........: linux/drivers/s390/block/dasd.c * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> * Horst Hummel <Horst.Hummel@de.ibm.com> * Carsten Otte <Cotte@de.ibm.com> * Bugreports.to..: <Linux390@de.ibm.com> * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 * * $Revision: 1.1.1.1 $ * * History of changes (starts July 2000) * 11/09/00 complete redesign after code review * 02/01/01 added dynamic registration of ioctls * fixed bug in registration of new majors * fixed handling of request during dasd_end_request * fixed handling of plugged queues * fixed partition handling and HDIO_GETGEO * fixed traditional naming scheme for devices beyond 702 * fixed some race conditions related to modules * added devfs suupport * 03/06/01 refined dynamic attach/detach for leaving devices which are online. * 03/09/01 refined dynamic modifiaction of devices * 03/12/01 moved policy in dasd_format to dasdfmt (renamed BIODASDFORMAT) * 03/19/01 added BIODASDINFO-ioctl * removed 2.2 compatibility * 04/27/01 fixed PL030119COT (dasd_disciplines does not work) * 04/30/01 fixed PL030146HSM (module locking with dynamic ioctls) * fixed PL030130SBA (handling of invalid ranges) * 05/02/01 fixed PL030145SBA (killing dasdmt) * fixed PL030149SBA (status of 'accepted' devices) * fixed PL030146SBA (BUG in ibm.c after adding device) * added BIODASDPRRD ioctl interface * 05/11/01 fixed PL030164MVE (trap in probeonly mode) * 05/15/01 fixed devfs support for unformatted devices * 06/26/01 hopefully fixed PL030172SBA,PL030234SBA * 07/09/01 fixed PL030324MSH (wrong statistics output) * 07/16/01 merged in new fixes for handling low-mem situations * 01/22/01 fixed PL030579KBE (wrong statistics) * 08/07/03 fixed LTC BZ 3847 Erroneous message when formatting DASD */ #include <linux/config.h> #include <linux/version.h> #include <linux/kmod.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/stddef.h> #include <linux/kernel.h> #include <linux/tqueue.h> #include <linux/timer.h> #include <linux/slab.h> #include <linux/genhd.h> #include <linux/hdreg.h> #include <linux/interrupt.h> #include <linux/ctype.h> #ifdef CONFIG_PROC_FS #include <linux/proc_fs.h> #endif /* CONFIG_PROC_FS */ #include <linux/spinlock.h> #include <linux/devfs_fs_kernel.h> #include <linux/blkpg.h> #include <linux/wait.h> #include <asm/ccwcache.h> #include <asm/debug.h> #include <asm/atomic.h> #include <asm/delay.h> #include <asm/io.h> #include <asm/semaphore.h> #include <asm/ebcdic.h> #include <asm/uaccess.h> #include <asm/irq.h> #include <asm/s390_ext.h> #include <asm/s390dyn.h> #include <asm/idals.h> #include "dasd_int.h" #ifdef CONFIG_DASD_ECKD #include "dasd_eckd.h" #endif /* CONFIG_DASD_ECKD */ #ifdef CONFIG_DASD_FBA #include "dasd_fba.h" #endif /* CONFIG_DASD_FBA */ #ifdef CONFIG_DASD_DIAG #include "dasd_diag.h" #endif /* CONFIG_DASD_DIAG */ /******************************************************************************** * SECTION: exported variables of dasd.c ********************************************************************************/ debug_info_t *dasd_debug_area; MODULE_AUTHOR ("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); MODULE_DESCRIPTION ("Linux on S/390 DASD device driver," " Copyright 2000 IBM Corporation"); MODULE_SUPPORTED_DEVICE ("dasd"); MODULE_PARM (dasd, "1-" __MODULE_STRING (256) "s"); MODULE_PARM (dasd_disciplines, "1-" __MODULE_STRING (8) "s"); #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,12)) MODULE_LICENSE ("GPL"); #endif EXPORT_SYMBOL (dasd_chanq_enq_head); EXPORT_SYMBOL (dasd_debug_area); EXPORT_SYMBOL (dasd_chanq_enq); EXPORT_SYMBOL (dasd_chanq_deq); EXPORT_SYMBOL (dasd_discipline_add); EXPORT_SYMBOL (dasd_discipline_del); EXPORT_SYMBOL (dasd_start_IO); EXPORT_SYMBOL (dasd_term_IO); EXPORT_SYMBOL (dasd_schedule_bh); EXPORT_SYMBOL (dasd_schedule_bh_timed); EXPORT_SYMBOL (dasd_int_handler); EXPORT_SYMBOL (dasd_oper_handler); EXPORT_SYMBOL (dasd_alloc_request); EXPORT_SYMBOL (dasd_free_request); EXPORT_SYMBOL (dasd_ioctl_no_register); EXPORT_SYMBOL (dasd_ioctl_no_unregister); EXPORT_SYMBOL (dasd_default_erp_action); EXPORT_SYMBOL (dasd_default_erp_postaction); EXPORT_SYMBOL (dasd_sleep_on_req); EXPORT_SYMBOL (dasd_set_normalized_cda); EXPORT_SYMBOL (dasd_device_from_kdev); /******************************************************************************** * SECTION: Constant definitions to be used within this file ********************************************************************************/ #define PRINTK_HEADER DASD_NAME":" #define DASD_PROFILE /* fill profile information - used for */ /* statistics and perfomance */ #ifndef CONFIG_PROC_FS /* DASD_PROFILE doesn't make sense */ #undef DASD_PROFILE /* without procfs */ #endif /* not CONFIG_PROC_FS */ #define DASD_CHANQ_MAX_SIZE 4 /******************************************************************************** * SECTION: prototypes for static functions of dasd.c ********************************************************************************/ static request_fn_proc do_dasd_request; static int dasd_set_device_level (unsigned int, dasd_discipline_t *, int); static request_queue_t *dasd_get_queue (kdev_t kdev); static void cleanup_dasd (void); static void dasd_plug_device (dasd_device_t * device); static int dasd_fillgeo (int kdev, struct hd_geometry *geo); static void dasd_enable_ranges (dasd_range_t *, dasd_discipline_t *, int); static void dasd_disable_ranges (dasd_range_t *, dasd_discipline_t *, int, int); static void dasd_enable_single_device ( unsigned long); static inline int dasd_state_init_to_ready(dasd_device_t*); static inline void dasd_setup_partitions ( dasd_device_t *); static inline void dasd_destroy_partitions ( dasd_device_t *); static inline int dasd_setup_blkdev(dasd_device_t*); static void dasd_deactivate_queue (dasd_device_t *); static inline int dasd_disable_blkdev(dasd_device_t*); static void dasd_flush_chanq ( dasd_device_t * device, int destroy ); static void dasd_flush_request_queues ( dasd_device_t * device, int destroy ); static struct block_device_operations dasd_device_operations; static inline dasd_device_t ** dasd_device_from_devno (int); static void dasd_process_queues (dasd_device_t * device); static int dasd_sleep_on_immediate (ccw_req_t *cqr); static int dasd_devno_from_devindex (int devindex); static int dasd_devindex_from_devno (int devno); /******************************************************************************** * SECTION: static variables of dasd.c ********************************************************************************/ static devfs_handle_t dasd_devfs_handle; static wait_queue_head_t dasd_init_waitq; static atomic_t dasd_init_pending = ATOMIC_INIT (0); #ifdef CONFIG_DASD_DYNAMIC /******************************************************************************** * SECTION: managing dynamic configuration of dasd_driver ********************************************************************************/ static struct list_head dasd_devreg_head = LIST_HEAD_INIT (dasd_devreg_head); /* * function: dasd_create_devreg * creates a dasd_devreg_t related to a devno */ static inline dasd_devreg_t * dasd_create_devreg (int devno) { dasd_devreg_t *r = kmalloc (sizeof (dasd_devreg_t), GFP_KERNEL); if (r != NULL) { memset (r, 0, sizeof (dasd_devreg_t)); r->devreg.ci.devno = devno; r->devreg.flag = DEVREG_TYPE_DEVNO; r->devreg.oper_func = dasd_oper_handler; } return r; } /* * function: dasd_destroy_devreg * destroys the dasd_devreg_t given as argument */ static inline void dasd_destroy_devreg (dasd_devreg_t * devreg) { kfree (devreg); } #endif /* CONFIG_DASD_DYNAMIC */ /******************************************************************************** * SECTION: managing setup of dasd_driver ********************************************************************************/ /* default setting is probeonly, autodetect */ static int dasd_probeonly = 0; /* is true, when probeonly mode is active */ static int dasd_autodetect = 0; /* is true, when autodetection is active */ static dasd_range_t dasd_range_head = { list:LIST_HEAD_INIT (dasd_range_head.list) }; static spinlock_t range_lock = SPIN_LOCK_UNLOCKED; /* * function: dasd_create_range * creates a dasd_range_t according to the arguments * FIXME: no check is performed for reoccurrence of a devno */ static inline dasd_range_t * dasd_create_range (int from, int to, int features) { dasd_range_t *range = NULL; range = (dasd_range_t *) kmalloc (sizeof (dasd_range_t), GFP_KERNEL); if (range == NULL) return NULL; memset (range, 0, sizeof (dasd_range_t)); range->from = from; range->to = to; range->features = features; return range; } /* * function dasd_destroy_range * destroy a range allocated wit dasd_crate_range * CAUTION: must not be callen in arunning sysztem, because it destroys * the mapping of DASDs */ static inline void dasd_destroy_range (dasd_range_t * range) { kfree (range); } /* * function: dasd_append_range * appends the range given as argument to the list anchored at dasd_range_head. */ static inline void dasd_append_range (dasd_range_t * range) { long flags; spin_lock_irqsave (&range_lock, flags); list_add_tail (&range->list, &dasd_range_head.list); spin_unlock_irqrestore (&range_lock, flags); } /* * function dasd_dechain_range * removes a range from the chain of ranges * CAUTION: must not be called in a running system because it destroys * the mapping of devices */ static inline void dasd_dechain_range (dasd_range_t * range) { unsigned long flags; spin_lock_irqsave (&range_lock, flags); list_del (&range->list); spin_unlock_irqrestore (&range_lock, flags); } /* * function: dasd_add_range * creates a dasd_range_t according to the arguments and * appends it to the list of ranges. * If a device in the range is already in an other range, we split the * range and add the subranges (no duplicate devices). * additionally a devreg_t is created and added to the list of devregs */ static inline void dasd_add_range (int from, int to, int features) { dasd_range_t *range; int start, end, index, i; if (from > to) { MESSAGE (KERN_DEBUG, "Adding device range %04x-%04x: " "range invalid, ignoring.", from, to); return; } /* loop over the given range, remove the already contained devices */ /* and add the remaining subranges */ for (start = index = from, end = -EINVAL; index <= to; index++) { if (dasd_devindex_from_devno(index) > 0) { /* current device is already in range */ MESSAGE (KERN_DEBUG, "dasd_add_range %04x-%04x: " "device %04x is already in range", from, to, index); if (start == index) start++; /* first already in range */ else end = index -1; /* current already in range */ } else { if (index == to) end = to; /* end of original range reached */ } range = NULL; if (end != -EINVAL) { MESSAGE (KERN_DEBUG, "dasd_add_range %04x-%04x: " "add (sub)range %04x-%04x", from, to, start, end); range = dasd_create_range (start, end, features); end = -EINVAL; start = index + 1; } if (range) { dasd_append_range (range); #ifdef CONFIG_DASD_DYNAMIC /* allocate and chain devreg infos for the devnos... */ for (i = range->from; i <= range->to; i++) { dasd_devreg_t *reg = dasd_create_devreg (i); s390_device_register (®->devreg); list_add (®->list, &dasd_devreg_head); } #endif /* CONFIG_DASD_DYNAMIC */ } } return; } /* * function: dasd_remove_range * removes a range and the corresponding devregs from all of the chains * CAUTION: must not be called in a running system because it destroys * the mapping of devices! */ static inline void dasd_remove_range (dasd_range_t * range) { #ifdef CONFIG_DASD_DYNAMIC /* deallocate and dechain devreg infos for the devnos... */ { int i; for (i = range->from; i <= range->to; i++) { struct list_head *l; dasd_devreg_t *reg = NULL; list_for_each (l, &dasd_devreg_head) { reg = list_entry (l, dasd_devreg_t, list); if (reg->devreg.flag == DEVREG_TYPE_DEVNO && reg->devreg.ci.devno == i && reg->devreg.oper_func == dasd_oper_handler) break; } if (l == &dasd_devreg_head) BUG (); list_del(®->list); s390_device_unregister (®->devreg); dasd_destroy_devreg (reg); } } #endif /* CONFIG_DASD_DYNAMIC */ dasd_dechain_range (range); dasd_destroy_range (range); } /* * function: dasd_devindex_from_devno * finds the logical number of the devno supplied as argument in the list * of dasd ranges and returns it or ENODEV when not found */ static int dasd_devindex_from_devno (int devno) { dasd_range_t *temp; int devindex = 0; unsigned long flags; struct list_head *l; spin_lock_irqsave (&range_lock, flags); list_for_each (l, &dasd_range_head.list) { temp = list_entry (l, dasd_range_t, list); if (devno >= temp->from && devno <= temp->to) { spin_unlock_irqrestore (&range_lock, flags); return devindex + devno - temp->from; } devindex += temp->to - temp->from + 1; } spin_unlock_irqrestore (&range_lock, flags); return -ENODEV; } /* * function: dasd_devno_from_devindex */ static int dasd_devno_from_devindex (int devindex) { dasd_range_t *temp; unsigned long flags; struct list_head *l; spin_lock_irqsave (&range_lock, flags); list_for_each (l, &dasd_range_head.list) { temp = list_entry (l, dasd_range_t, list); if ( devindex < temp->to - temp->from + 1) { spin_unlock_irqrestore (&range_lock, flags); return temp->from + devindex; } devindex -= temp->to - temp->from + 1; } spin_unlock_irqrestore (&range_lock, flags); return -ENODEV; } /******************************************************************************** * SECTION: parsing the dasd= parameter of the parmline/insmod cmdline ********************************************************************************/ /* * char *dasd[] is intended to hold the ranges supplied by the dasd= statement * it is named 'dasd' to directly be filled by insmod with the comma separated * strings when running as a module. * a maximum of 256 ranges can be supplied, as the parmline is limited to * <1024 Byte anyway. */ char *dasd[256]; char *dasd_disciplines[8]; #ifndef MODULE /* * function: dasd_split_parm_string * splits the parmline given to the kernel into comma separated strings * which are filled into the 'dasd[]' array, to be parsed later on */ static void dasd_split_parm_string (char *str) { char *tmp = str; int count = 0; while (tmp != NULL && *tmp != '\0') { char *end; int len; end = strchr (tmp, ','); if (end == NULL) { len = strlen (tmp) + 1; } else { len = (long) end - (long) tmp + 1; *end = '\0'; end++; } dasd[count] = kmalloc (len * sizeof (char), GFP_ATOMIC); if (dasd[count] == NULL) { MESSAGE (KERN_WARNING, "can't store dasd= parameter no" " %d", count + 1); break; } memset (dasd[count], 0, len * sizeof (char)); memcpy (dasd[count], tmp, len * sizeof (char)); count++; tmp = end; }; } /* * dasd_parm_string holds a concatenated version of all 'dasd=' parameters * supplied in the parmline, which is later to be split by * dasd_split_parm_string * FIXME: why first concatenate then split ? */ static char dasd_parm_string[1024] __initdata = { 0, }; /* * function: dasd_setup * is invoked for any single 'dasd=' parameter supplied in the parmline * it merges all the arguments into dasd_parm_string */ void __init dasd_setup (char *str, int *ints) { int len = strlen (dasd_parm_string); if (len != 0) { strcat (dasd_parm_string, ","); } strcat (dasd_parm_string, str); } /* * function: dasd_call_setup * is the 2.4 version of dasd_setup and * is invoked for any single 'dasd=' parameter supplied in the parmline */ int __init dasd_call_setup (char *str) { int dummy; dasd_setup (str, &dummy); return 1; } int __init dasd_disciplines_setup (char *str) { return 1; } __setup ("dasd=", dasd_call_setup); __setup ("dasd_disciplines=", dasd_disciplines_setup); #endif /* MODULE */ /* * function: dasd_strtoul * provides a wrapper to simple_strtoul to strip leading '0x' and * interpret any argument to dasd=[range,...] as hexadecimal */ static inline int dasd_strtoul (char *str, char **stra, int* features) { char *temp=str; char *buffer; int val,i,start; buffer=(char*)kmalloc((strlen(str)+1)*sizeof(char),GFP_ATOMIC); if (buffer==NULL) { MESSAGE_LOG (KERN_WARNING, "can't parse dasd= parameter %s due " "to low memory", str); } /* remove leading '0x' */ if (*temp == '0') { temp++; /* strip leading zero */ if (*temp == 'x') temp++; /* strip leading x */ } /* copy device no to buffer and convert to decimal */ for (i=0; temp[i]!='\0' && temp[i]!='(' && temp[i]!='-' && temp[i]!=' '; i++){ if (isxdigit(temp[i])) { buffer[i]=temp[i]; } else { return -EINVAL; } } buffer[i]='\0'; val = simple_strtoul (buffer, &buffer, 16); /* check for features - e.g. (ro) ; the '\0', ')' and '-' stops check */ *features = DASD_FEATURE_DEFAULT; if (temp[i]=='(') { while (temp[i]!='\0' && temp[i]!=')'&&temp[i]!='-') { start=++i; /* move next feature to buffer */ for (;temp[i]!='\0'&&temp[i]!=':'&&temp[i]!=')'&&temp[i]!='-';i++) buffer[i-start]=temp[i]; buffer[i-start]='\0'; if (strlen(buffer)) { if (!strcmp(buffer,"ro")) { /* handle 'ro' feature */ (*features) |= DASD_FEATURE_READONLY; break; } MESSAGE_LOG (KERN_WARNING, "unsupported feature: %s, " "ignoring setting", buffer); } } } *stra = temp+i; if ((val > 0xFFFF) || (val < 0)) return -EINVAL; return val; } /* * function: dasd_parse * examines the strings given in the string array str and * creates and adds the ranges to the apropriate lists */ static int dasd_parse (char **str) { char *temp; int from, to; int features; int rc = 0; while (*str) { temp = *str; from = 0; to = 0; if (strcmp ("autodetect", *str) == 0) { dasd_autodetect = 1; MESSAGE (KERN_INFO, "%s", "turning to autodetection mode"); break; } else if (strcmp ("probeonly", *str) == 0) { dasd_probeonly = 1; MESSAGE (KERN_INFO, "%s", "turning to probeonly mode"); break; } else { /* turn off autodetect mode, if any range is present */ dasd_autodetect = 0; from = dasd_strtoul (temp, &temp, &features); to = from; if (*temp == '-') { temp++; to = dasd_strtoul (temp, &temp, &features); } if (from == -EINVAL || to == -EINVAL ) { rc = -EINVAL; break; } else { dasd_add_range (from, to ,features); } } str++; } return rc; } /******************************************************************************** * SECTION: Dealing with devices registered to multiple major numbers ********************************************************************************/ static spinlock_t dasd_major_lock = SPIN_LOCK_UNLOCKED; static struct list_head dasd_major_info = LIST_HEAD_INIT(dasd_major_info); static major_info_t dasd_major_static = { gendisk:{INIT_GENDISK(94, DASD_NAME, DASD_PARTN_BITS, DASD_PER_MAJOR)}, flags: DASD_MAJOR_INFO_IS_STATIC }; static major_info_t * get_new_major_info (void) { major_info_t *major_info = NULL; major_info = kmalloc (sizeof (major_info_t), GFP_KERNEL); if (major_info) { static major_info_t temp_major_info = { gendisk:{ INIT_GENDISK (0, DASD_NAME, DASD_PARTN_BITS, DASD_PER_MAJOR)} }; memcpy (major_info, &temp_major_info, sizeof (major_info_t)); } return major_info; } /* * register major number * is called with the 'static' major_info during init of the driver or 'NULL' to * allocate an additional dynamic major. */ static int dasd_register_major (major_info_t * major_info) { int rc = 0; int major; unsigned long flags; /* allocate dynamic major */ if (major_info == NULL) { major_info = get_new_major_info (); if (!major_info) { MESSAGE (KERN_WARNING, "%s", "Cannot get memory to allocate another " "major number"); return -ENOMEM; } } major = major_info->gendisk.major; /* init devfs array */ major_info->gendisk.de_arr = (devfs_handle_t *) kmalloc (DASD_PER_MAJOR * sizeof (devfs_handle_t), GFP_KERNEL); if(major_info->gendisk.de_arr == NULL) goto out_gd_de_arr; memset (major_info->gendisk.de_arr, 0, DASD_PER_MAJOR * sizeof (devfs_handle_t)); /* init flags */ major_info->gendisk.flags = (char *) kmalloc (DASD_PER_MAJOR * sizeof (char), GFP_KERNEL); if(major_info->gendisk.flags == NULL) goto out_gd_flags; memset (major_info->gendisk.flags, 0, DASD_PER_MAJOR * sizeof (char)); /* register blockdevice */ rc = devfs_register_blkdev (major, DASD_NAME, &dasd_device_operations); if (rc < 0) { MESSAGE (KERN_WARNING, "Cannot register to major no %d, rc = %d", major, rc); goto out_reg_blkdev; } else { major_info->flags |= DASD_MAJOR_INFO_REGISTERED; } /* Insert the new major info into dasd_major_info if needed (dynamic major) */ if (!(major_info->flags & DASD_MAJOR_INFO_IS_STATIC)) { spin_lock_irqsave (&dasd_major_lock, flags); list_add_tail (&major_info->list, &dasd_major_info); spin_unlock_irqrestore (&dasd_major_lock, flags); } if (major == 0) { major = rc; rc = 0; } /* init array of devices */ major_info->dasd_device = (dasd_device_t **) kmalloc (DASD_PER_MAJOR * sizeof (dasd_device_t *), GFP_ATOMIC); if (!major_info->dasd_device) goto out_devices; memset (major_info->dasd_device, 0, DASD_PER_MAJOR * sizeof (dasd_device_t *)); /* init blk_size */ blk_size[major] = (int *) kmalloc ((1 << MINORBITS) * sizeof (int), GFP_ATOMIC); if (!blk_size[major]) goto out_blk_size; memset (blk_size[major], 0, (1 << MINORBITS) * sizeof (int)); /* init blksize_size */ blksize_size[major] = (int *) kmalloc ((1 << MINORBITS) * sizeof (int), GFP_ATOMIC); if (!blksize_size[major]) goto out_blksize_size; memset (blksize_size[major], 0, (1 << MINORBITS) * sizeof (int)); /* init_hardsect_size */ hardsect_size[major] = (int *) kmalloc ((1 << MINORBITS) * sizeof (int), GFP_ATOMIC); if (!hardsect_size[major]) goto out_hardsect_size; memset (hardsect_size[major], 0, (1 << MINORBITS) * sizeof (int)); /* init max_sectors */ max_sectors[major] = (int *) kmalloc ((1 << MINORBITS) * sizeof (int), GFP_ATOMIC); if (!max_sectors[major]) goto out_max_sectors; memset (max_sectors[major], 0, (1 << MINORBITS) * sizeof (int)); /* finally do the gendisk stuff */ major_info->gendisk.part = kmalloc ((1 << MINORBITS) * sizeof (struct hd_struct), GFP_ATOMIC); if (!major_info->gendisk.part) goto out_gendisk; memset (major_info->gendisk.part, 0, (1 << MINORBITS) * sizeof (struct hd_struct)); INIT_BLK_DEV (major, do_dasd_request, dasd_get_queue, NULL); major_info->gendisk.sizes = blk_size[major]; major_info->gendisk.major = major; add_gendisk (&major_info->gendisk); return major; /* error handling - free the prior allocated memory */ out_gendisk: kfree (max_sectors[major]); max_sectors[major] = NULL; out_max_sectors: kfree (hardsect_size[major]); hardsect_size[major] = NULL; out_hardsect_size: kfree (blksize_size[major]); blksize_size[major] = NULL; out_blksize_size: kfree (blk_size[major]); blk_size[major] = NULL; out_blk_size: kfree (major_info->dasd_device); out_devices: /* Delete the new major info from dasd_major_info list if needed (dynamic) +*/ if (!(major_info->flags & DASD_MAJOR_INFO_IS_STATIC)) { spin_lock_irqsave (&dasd_major_lock, flags); list_del (&major_info->list); spin_unlock_irqrestore (&dasd_major_lock, flags); } /* unregister blockdevice */ rc = devfs_unregister_blkdev (major, DASD_NAME); if (rc < 0) { MESSAGE (KERN_WARNING, "Unable to unregister from major no %d, rc = %d", major, rc); } else { major_info->flags &= ~DASD_MAJOR_INFO_REGISTERED; } out_reg_blkdev: kfree (major_info->gendisk.flags); out_gd_flags: kfree (major_info->gendisk.de_arr); out_gd_de_arr: /* Delete the new major info from dasd_major_info if needed */ if (!(major_info->flags & DASD_MAJOR_INFO_IS_STATIC)) { kfree (major_info); } return -ENOMEM; } static int dasd_unregister_major (major_info_t * major_info) { int rc = 0; int major; unsigned long flags; if (major_info == NULL) { return -EINVAL; } major = major_info->gendisk.major; INIT_BLK_DEV (major, NULL, NULL, NULL); del_gendisk (&major_info->gendisk); kfree (major_info->dasd_device); kfree (major_info->gendisk.part); kfree (blk_size[major]); kfree (blksize_size[major]); kfree (hardsect_size[major]); kfree (max_sectors[major]); blk_size[major] = NULL; blksize_size[major] = NULL; hardsect_size[major] = NULL; max_sectors[major] = NULL; rc = devfs_unregister_blkdev (major, DASD_NAME); if (rc < 0) { MESSAGE (KERN_WARNING, "Cannot unregister from major no %d, rc = %d", major, rc); return rc; } else { major_info->flags &= ~DASD_MAJOR_INFO_REGISTERED; } kfree (major_info->gendisk.flags); kfree (major_info->gendisk.de_arr); /* Delete the new major info from dasd_major_info if needed */ if (!(major_info->flags & DASD_MAJOR_INFO_IS_STATIC)) { spin_lock_irqsave (&dasd_major_lock, flags); list_del (&major_info->list); spin_unlock_irqrestore (&dasd_major_lock, flags); kfree (major_info); } return rc; } /* * function: dasd_device_from_kdev * finds the device structure corresponding to the kdev supplied as argument * in the major_info structures and returns it or NULL when not found */ dasd_device_t * dasd_device_from_kdev (kdev_t kdev) { major_info_t *major_info; dasd_device_t *device; struct list_head *l; unsigned long flags; device = NULL; spin_lock_irqsave (&dasd_major_lock, flags); list_for_each (l, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); if (major_info->gendisk.major == MAJOR (kdev)) { device = major_info->dasd_device[MINOR (kdev) >> DASD_PARTN_BITS]; break; } } spin_unlock_irqrestore (&dasd_major_lock, flags); return device; } /* * function: dasd_device_from_devno * finds the address of the device structure corresponding to the devno * supplied as argument in the major_info structures and returns * it or NULL when not found */ static inline dasd_device_t ** dasd_device_from_devno (int devno) { major_info_t *major_info; dasd_device_t **device; struct list_head *l; int devindex; unsigned long flags; spin_lock_irqsave (&dasd_major_lock, flags); devindex = dasd_devindex_from_devno (devno); if (devindex < 0) { spin_unlock_irqrestore (&dasd_major_lock, flags); return NULL; } device = NULL; list_for_each (l, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); if (devindex < DASD_PER_MAJOR) { device = &major_info->dasd_device[devindex]; break; } devindex -= DASD_PER_MAJOR; } spin_unlock_irqrestore (&dasd_major_lock, flags); return device; } /* * function: dasd_features_from_devno * finds the device range corresponding to the devno * supplied as argument in the major_info structures and returns * the features set for it */ static int dasd_features_from_devno (int devno) { dasd_range_t *temp; int devindex = 0; unsigned long flags; struct list_head *l; spin_lock_irqsave (&range_lock, flags); list_for_each (l, &dasd_range_head.list) { temp = list_entry (l, dasd_range_t, list); if (devno >= temp->from && devno <= temp->to) { spin_unlock_irqrestore (&range_lock, flags); return temp->features; } devindex += temp->to - temp->from + 1; } spin_unlock_irqrestore (&range_lock, flags); return -ENODEV; } /* * function: dasd_check_bp_block * checks the blocksize and returns 0 if valid. */ static int dasd_check_bp_block (dasd_device_t *device) { int rc; switch (device->sizes.bp_block) { case 512: case 1024: case 2048: case 4096: rc = 0; break; default: rc = -EMEDIUMTYPE; } return rc; } /******************************************************************************** * SECTION: managing dasd disciplines ********************************************************************************/ /* anchor and spinlock for list of disciplines */ static struct list_head dasd_disc_head = LIST_HEAD_INIT(dasd_disc_head); static spinlock_t discipline_lock = SPIN_LOCK_UNLOCKED; /* * function dasd_discipline_enq * chains the discpline given as argument to the tail of disiplines. * Exception: DIAG is always queued to the head, to ensure that CMS RESERVED * minidisks are invariably accessed using DIAG. */ static inline void dasd_discipline_enq (dasd_discipline_t *discipline) { if (strncmp (discipline->name, "DIAG", 4) == 0) { list_add (&discipline->list, &dasd_disc_head); } else { list_add_tail (&discipline->list, &dasd_disc_head); } } /* * function dasd_discipline_deq * removes the discipline given as argument from the list of disciplines */ static inline void dasd_discipline_deq (dasd_discipline_t * discipline) { if (&discipline->list) { list_del (&discipline->list); } } void dasd_discipline_add (dasd_discipline_t * discipline) { unsigned long flags; MOD_INC_USE_COUNT; spin_lock_irqsave (&discipline_lock,flags); dasd_discipline_enq (discipline); spin_unlock_irqrestore (&discipline_lock,flags); dasd_enable_ranges (&dasd_range_head, discipline, DASD_STATE_ONLINE); } void dasd_discipline_del (dasd_discipline_t * discipline) { unsigned long flags; dasd_disable_ranges(&dasd_range_head, discipline, DASD_STATE_DEL, 1); spin_lock_irqsave (&discipline_lock,flags); dasd_discipline_deq (discipline); spin_unlock_irqrestore (&discipline_lock,flags); MOD_DEC_USE_COUNT; } /* * function dasd_find_disc * checks the list of disciplines for the first one able to access the device */ static inline dasd_discipline_t * dasd_find_disc (dasd_device_t * device, dasd_discipline_t *discipline) { dasd_discipline_t *t; struct list_head *l = discipline ? &discipline->list : dasd_disc_head.next; do { t = list_entry(l,dasd_discipline_t,list); if ( ( t->id_check == NULL || t->id_check (&device->devinfo) == 0 ) && ( t->check_characteristics == NULL || t->check_characteristics (device) == 0 ) ) break; l = l->next; if ( discipline || l == &dasd_disc_head ) { t = NULL; break; } } while ( 1 ); return t; } /******************************************************************************** * SECTION: profiling stuff ********************************************************************************/ #ifdef CONFIG_PROC_FS static dasd_profile_info_t dasd_global_profile; #endif /* CONFIG_PROC_FS */ #ifdef DASD_PROFILE #define DASD_PROFILE_ON 1 #define DASD_PROFILE_OFF 0 static unsigned int dasd_profile_level = DASD_PROFILE_OFF; /* * macro: dasd_profile_add_counter * increments counter in global and local profiling structures * according to the value */ #define dasd_profile_add_counter( value, counter, device ) \ { \ int ind; \ long help; \ for (ind = 0, help = value >> 2; \ ind < 31 && help; \ help = help >> 1, ind++) {} \ dasd_global_profile.counter[ind]++; \ device->profile.counter[ind]++; \ } /* * function dasd_profile_add * adds the profiling information from the cqr given as argument to the * global and device specific profiling information */ void dasd_profile_add (ccw_req_t * cqr) { long strtime, irqtime, endtime, tottime; /* in microsecnds*/ long tottimeps, sectors; dasd_device_t *device = cqr->device; if (!cqr->req) /* safeguard against abnormal cqrs */ return; if ((!cqr->buildclk) || (!cqr->startclk) || (!cqr->stopclk ) || (!cqr->endclk ) || (!(sectors = ((struct request *) (cqr->req))->nr_sectors))) return; strtime = ((cqr->startclk - cqr->buildclk) >> 12); irqtime = ((cqr->stopclk - cqr->startclk) >> 12); endtime = ((cqr->endclk - cqr->stopclk) >> 12); tottime = ((cqr->endclk - cqr->buildclk) >> 12); tottimeps = tottime / sectors; if (!dasd_global_profile.dasd_io_reqs) { memset (&dasd_global_profile, 0, sizeof (dasd_profile_info_t)); }; if (!device->profile.dasd_io_reqs) { memset (&device->profile, 0, sizeof (dasd_profile_info_t)); }; dasd_global_profile.dasd_io_reqs++; device->profile.dasd_io_reqs++; dasd_global_profile.dasd_io_sects+=sectors; device->profile.dasd_io_sects+=sectors; dasd_profile_add_counter (sectors, dasd_io_secs, device); dasd_profile_add_counter (tottime, dasd_io_times, device); dasd_profile_add_counter (tottimeps, dasd_io_timps, device); dasd_profile_add_counter (strtime, dasd_io_time1, device); dasd_profile_add_counter (irqtime, dasd_io_time2, device); dasd_profile_add_counter (irqtime / sectors, dasd_io_time2ps, device); dasd_profile_add_counter (endtime, dasd_io_time3, device); } #endif /* DASD_PROFILE */ /******************************************************************************** * SECTION: All the gendisk stuff ********************************************************************************/ /******************************************************************************** * SECTION: Managing wrappers for ccwcache ********************************************************************************/ /* * function dasd_alloc_request * tries to return space for a channel program of length cplength with * additional data of size datasize. * If the ccwcache cannot fulfill the request it tries the lowmem requests * before giving up finally. * FIXME: initialization of ccw_req_t should be done by function of ccwcache */ ccw_req_t * dasd_alloc_request (char *magic, int cplength, int datasize, dasd_device_t *device) { ccw_req_t *cqr; unsigned long size_needed; unsigned long data_offset, ccw_offset; dasd_lowmem_t *lowmem; if ((cqr = ccw_alloc_request (magic, cplength, datasize)) != NULL) { return cqr; } /* Sanity checks */ if (magic == NULL || datasize > PAGE_SIZE || cplength == 0 || (cplength * sizeof(ccw1_t)) > PAGE_SIZE) BUG(); /* use lowmem page only for ERP or */ /* if there are less than 2 requests on queue */ if (device->queue.head != NULL && device->queue.head->next != NULL && device->queue.head->status != CQR_STATUS_ERROR) { return NULL; } /* We try to keep things together in memory */ size_needed = (sizeof (ccw_req_t) + 7) & (~7L); data_offset = ccw_offset = 0; if (size_needed + datasize <= PAGE_SIZE) { /* Keep data with the request */ data_offset = size_needed; size_needed += (datasize + 7) & (~7L); } if (size_needed + cplength*sizeof(ccw1_t) <= PAGE_SIZE) { /* Keep CCWs with request */ ccw_offset = size_needed; size_needed += (cplength*sizeof(ccw1_t)) & (~7L); } /* take page from lowmem_pool for request */ list_for_each_entry (lowmem, &device->lowmem_pool, list) { list_del (&lowmem->list); cqr = (ccw_req_t *) lowmem; memset (cqr, 0, PAGE_SIZE); cqr->flags |= CQR_FLAGS_LM_CQR; break; } if (cqr == NULL) return NULL; /* take page from lowmem_pool for the extra data */ if (data_offset == 0) { list_for_each_entry (lowmem, &device->lowmem_pool, list) { list_del (&lowmem->list); cqr->data = (void *) lowmem; memset (cqr->data, 0, PAGE_SIZE); break; } if (cqr->data == NULL) { printk(KERN_DEBUG PRINTK_HEADER "Couldn't allocate data area\n"); lowmem = (dasd_lowmem_t *) cqr; list_add (&lowmem->list, &device->lowmem_pool); return NULL; } } else { /* Extra data already allocated with the request */ cqr->data = (void *) ((addr_t) cqr + data_offset); } /* take page from lowmem_pool for the channel program */ if (ccw_offset == 0) { list_for_each_entry (lowmem, &device->lowmem_pool, list) { list_del (&lowmem->list); cqr->cpaddr = (ccw1_t *) lowmem; memset (cqr->cpaddr, 0, PAGE_SIZE); break; } if (cqr->cpaddr == NULL) { printk (KERN_DEBUG PRINTK_HEADER "Couldn't allocate channel program area\n"); if (data_offset == 0) { lowmem = (dasd_lowmem_t *) cqr->data; list_add (&lowmem->list, &device->lowmem_pool); } lowmem = (dasd_lowmem_t *) cqr; list_add (&lowmem->list, &device->lowmem_pool); return NULL; } } else { /* Channel program already allocated with the request */ cqr->cpaddr = (ccw1_t *) ((addr_t) cqr + ccw_offset); } /* use the remaining memory of the cqr page for IDALs */ cqr->lowmem_idal_ptr = (void *) ((addr_t) cqr + size_needed); strncpy ((char *)(&cqr->magic), magic, 4); ASCEBC((char *)(&cqr->magic), 4); cqr->cplength = cplength; cqr->datasize = datasize; return cqr; } /* * function dasd_free_request * returns a ccw_req_t to the appropriate cache or emergeny request line */ void dasd_free_request (ccw_req_t *cqr, dasd_device_t* device) { unsigned long size_needed; dasd_lowmem_t *lowmem; #ifdef CONFIG_ARCH_S390X ccw1_t* ccw; /* clear any idals used for chain (might be in lowmen cqr page, */ /* in seperate lowmen page or kmalloced */ ccw=cqr->cpaddr-1; do { ccw++; if ((cqr->flags & CQR_FLAGS_LM_CQR) && (ccw->cda >= (unsigned long) cqr) && (ccw->cda < (unsigned long) cqr + PAGE_SIZE)) { /* IDAL is on the car lowmem page */ continue; } if ((cqr->flags & CQR_FLAGS_LM_IDAL) && (ccw->cda >= (unsigned long) cqr->lowmem_idal) && (ccw->cda < (unsigned long) cqr->lowmem_idal + PAGE_SIZE)) { /* IDAL is on seperate lowmem page */ continue; } /* IDAL was build by set_normalized_cda */ clear_normalized_cda (ccw); } while ((ccw->flags & CCW_FLAG_CC) || (ccw->flags & CCW_FLAG_DC) ); #endif /* give idal lowmem page back to lowmem_pool */ if (cqr->flags & CQR_FLAGS_LM_IDAL) { lowmem = (dasd_lowmem_t *) cqr->lowmem_idal; list_add (&lowmem->list, &device->lowmem_pool); cqr->flags &= ~CQR_FLAGS_LM_IDAL; } /* give cqr lowmem pages back to lowmem_pool */ if (cqr->flags & CQR_FLAGS_LM_CQR) { /* make the same decisions as in dasd_alloc_request */ size_needed = (sizeof (ccw_req_t) + 7) & (~7L); if (size_needed + cqr->datasize <= PAGE_SIZE) { /* We kept the data with the request */ size_needed += (cqr->datasize + 7) & (~7L); } else { lowmem = (dasd_lowmem_t *) cqr->data; list_add (&lowmem->list, &device->lowmem_pool); } if (size_needed + cqr->cplength * sizeof(ccw1_t) > PAGE_SIZE) { /* We didn't keep the CCWs with request */ lowmem = (dasd_lowmem_t *) cqr->cpaddr; list_add (&lowmem->list, &device->lowmem_pool); } lowmem = (dasd_lowmem_t *) cqr; list_add (&lowmem->list, &device->lowmem_pool); } else { ccw_free_request (cqr); } } /* * function dasd_set_normalized_cda * calls set_normalized_cda to build IDALs. * If this did not work because of low memory, we try to use memory from the * lowmem pool. */ int dasd_set_normalized_cda (ccw1_t *cp, unsigned long address, ccw_req_t *cqr, dasd_device_t *device) { #ifdef CONFIG_ARCH_S390X int rc; int nridaws; dasd_lowmem_t *lowmem; int count = cp->count; /* use lowmem idal page if already assinged */ if (!(cqr->flags & CQR_FLAGS_LM_IDAL)) { rc = set_normalized_cda (cp, (void *)address); if (rc !=-ENOMEM) { return rc; } } /* get number of idal words needed */ nridaws = ((address & (IDA_BLOCK_SIZE-1)) + count + (IDA_BLOCK_SIZE-1)) >> IDA_SIZE_LOG; /* check if we need an additional IDALs page */ if (!(cqr->flags & CQR_FLAGS_LM_IDAL)) { /* we got no lowmem cqr page OR */ /* there is no space left for IDALs */ if ((!(cqr->flags & CQR_FLAGS_LM_CQR)) || ((cqr->lowmem_idal_ptr + nridaws * sizeof(unsigned long)) > ((void *) cqr + PAGE_SIZE))) { /* use lowmem page only for ERP or */ /* if there are less than 2 requests on queue */ if (device->queue.head != NULL && device->queue.head->next != NULL && device->queue.head->status != CQR_STATUS_ERROR) { return -ENOMEM; } list_for_each_entry (lowmem, &device->lowmem_pool, list) { list_del (&lowmem->list); cqr->lowmem_idal = (void *)lowmem; cqr->lowmem_idal_ptr = (void *) lowmem; memset (cqr->lowmem_idal, 0, PAGE_SIZE); cqr->flags |= CQR_FLAGS_LM_IDAL; break; } } } /* now we (should) have an valid lowmem_idal_ptr and enough space for */ /* the IDALs - fill the idals table */ cp->flags |= CCW_FLAG_IDA; cp->cda = (__u32)(unsigned long)cqr->lowmem_idal_ptr; do { *((long*)cqr->lowmem_idal_ptr) = address; address = (address & -(IDA_BLOCK_SIZE)) + (IDA_BLOCK_SIZE); cqr->lowmem_idal_ptr += sizeof(unsigned long); nridaws --; } while ( nridaws > 0 ); #else cp->cda = address; #endif return 0; } /******************************************************************************** * SECTION: (de)queueing of requests to channel program queues ********************************************************************************/ /* * function dasd_chanq_enq * appends the cqr given as argument to the queue * has to be called with the queue lock (namely the s390_irq_lock) acquired */ inline void dasd_chanq_enq (dasd_chanq_t * q, ccw_req_t * cqr) { if (q->head != NULL) { q->tail->next = cqr; } else q->head = cqr; cqr->next = NULL; q->tail = cqr; check_then_set (&cqr->status, CQR_STATUS_FILLED, CQR_STATUS_QUEUED); #ifdef DASD_PROFILE if (dasd_profile_level == DASD_PROFILE_ON) { /* save profile information for non erp cqr */ if (cqr->refers == NULL) { unsigned int counter = 0; ccw_req_t *ptr; dasd_device_t *device = cqr->device; /* count the length of the chanq for statistics */ for (ptr = q->head; ptr->next != NULL && counter <=31; ptr = ptr->next) { counter++; } dasd_global_profile.dasd_io_nr_req[counter]++; device->profile.dasd_io_nr_req[counter]++; } } /* end if DASD_PROFILE_ON */ #endif } /* * function dasd_chanq_enq_head * chains the cqr given as argument to the queue head * has to be called with the queue lock (namely the s390_irq_lock) acquired */ inline void dasd_chanq_enq_head (dasd_chanq_t * q, ccw_req_t * cqr) { cqr->next = q->head; q->head = cqr; if (q->tail == NULL) q->tail = cqr; check_then_set (&cqr->status, CQR_STATUS_FILLED, CQR_STATUS_QUEUED); } /* * function dasd_chanq_deq * dechains the cqr given as argument from the queue * has to be called with the queue lock (namely the s390_irq_lock) acquired */ inline void dasd_chanq_deq (dasd_chanq_t * q, ccw_req_t * cqr) { ccw_req_t *prev; if (cqr == NULL) BUG (); if (cqr == q->head) { q->head = cqr->next; if (q->head == NULL) q->tail = NULL; } else { prev = q->head; while (prev && prev->next != cqr) prev = prev->next; if (prev == NULL) return; /* request not in chanq */ prev->next = cqr->next; if (prev->next == NULL) q->tail = prev; } cqr->next = NULL; } /******************************************************************************** * SECTION: Managing the device queues etc. ********************************************************************************/ /* * DASD_RESREL_TIMEOUT * * A timer is used to suspend the current reserve/release request * if it doesn't return within a certain time. */ void dasd_resrel_timeout (unsigned long cqr_ptr) { dasd_device_t *device = ((ccw_req_t *) cqr_ptr)->device; ccw_req_t *cqr; unsigned long flags; s390irq_spin_lock_irqsave (device->devinfo.irq, flags); cqr = device->queue.head; switch (cqr->status) { case CQR_STATUS_FILLED: case CQR_STATUS_QUEUED: /* request was not started - just set to failed */ cqr->status = CQR_STATUS_FAILED; break; case CQR_STATUS_IN_IO: case CQR_STATUS_ERROR: if (device->discipline->term_IO (cqr) != 0); cqr->status = CQR_STATUS_FAILED; break; default: ; /* DONE and FAILED are ok */ } dasd_schedule_bh (device); s390irq_spin_unlock_irqrestore (device->devinfo.irq, flags); } /* end dasd_resrel_timeout */ /* * Call unconditional reserve to break the reserve of an other system. * Timeout the request if it doesn't succseed within a certain time. */ static int dasd_steal_lock (dasd_device_t *device) { ccw_req_t *cqr; int rc = 0; if (!device->discipline->steal_lock) rc = -EINVAL; cqr = device->discipline->steal_lock (device); if (cqr) { struct timer_list res_timer; init_timer(&res_timer); res_timer.function = dasd_resrel_timeout; res_timer.data = (unsigned long) cqr; res_timer.expires = jiffies + 4 * HZ; add_timer(&res_timer); rc = dasd_sleep_on_immediate (cqr); del_timer_sync(&res_timer); dasd_free_request (cqr, device); } else { rc = -ENOMEM; } return rc; } /* end dasd_steal_lock */ /* * DASD_TERM_IO * * Attempts to terminate the current IO and set it to failed if termination * was successful. * Returns an appropriate return code. */ int dasd_term_IO (ccw_req_t * cqr) { int rc = 0; dasd_device_t *device = cqr->device; int irq; int retries = 0; if (!cqr) { BUG (); } irq = device->devinfo.irq; if (strncmp ((char *) &cqr->magic, device->discipline->ebcname, 4)) { DEV_MESSAGE (KERN_WARNING, device, " ccw_req_t 0x%08x magic doesn't match" " discipline 0x%08x", cqr->magic, *(unsigned int *) device->discipline->name); return -EINVAL; } while ((retries < 5 ) && (cqr->status == CQR_STATUS_IN_IO) ) { rc = clear_IO (irq, (long)cqr, cqr->options); switch (rc) { case 0: /* termination successful */ check_then_set (&cqr->status, CQR_STATUS_IN_IO, CQR_STATUS_FAILED); cqr->stopclk = get_clock (); break; case -ENODEV: DBF_DEV_EVENT (DBF_ERR, device, "%s", "device gone, retry"); break; case -EIO: DBF_DEV_EVENT (DBF_ERR, device, "%s", "I/O error, retry"); break; case -EBUSY: DBF_DEV_EVENT (DBF_ERR, device, "%s", "device busy, retry later"); break; default: DEV_MESSAGE (KERN_ERR, device, "line %d unknown RC=%d, please " "report to linux390@de.ibm.com", __LINE__, rc); BUG (); break; } dasd_schedule_bh (device); retries ++; } return rc; } /* * function dasd_start_IO * attempts to start the IO and returns an appropriate return code */ int dasd_start_IO (ccw_req_t * cqr) { int rc = 0; dasd_device_t *device = cqr->device; int irq; unsigned long long now; if (!cqr) { BUG (); } irq = device->devinfo.irq; if (strncmp ((char *) &cqr->magic, device->discipline->ebcname, 4)) { DEV_MESSAGE (KERN_ERR, device, " ccw_req_t 0x%08x magic doesn't match" " discipline 0x%08x", cqr->magic, *(unsigned int *) device->discipline->name); return -EINVAL; } now = get_clock (); cqr->startclk = now; if (!device->stopped) rc = do_IO (irq, cqr->cpaddr, (long) cqr, cqr->lpm, cqr->options); else rc = -EBUSY; switch (rc) { case 0: if (cqr->options & DOIO_WAIT_FOR_INTERRUPT) { /* request already finished (synchronous IO) */ check_then_set (&cqr->status, CQR_STATUS_QUEUED, CQR_STATUS_DONE); cqr->stopclk = now; dasd_schedule_bh (device); } else { check_then_set (&cqr->status, CQR_STATUS_QUEUED, CQR_STATUS_IN_IO); } break; case -EBUSY: DBF_DEV_EVENT (DBF_ERR, device, "%s", "device busy, retry later"); if (!timer_pending(&device->timer)) { init_timer (&device->timer); device->timer.function = dasd_schedule_bh_timed; device->timer.data = (unsigned long) device; device->timer.expires = jiffies + (HZ >> 4); add_timer (&device->timer); } else { mod_timer(&device->timer, jiffies + (HZ >> 4)); } break; case -ETIMEDOUT: DBF_DEV_EVENT (DBF_ERR, device, "%s", "request timeout - terminated"); case -ENODEV: case -EIO: check_then_set (&cqr->status, CQR_STATUS_QUEUED, CQR_STATUS_FAILED); cqr->stopclk = now; dasd_schedule_bh (device); break; default: DEV_MESSAGE (KERN_ERR, device, "line %d unknown RC=%d, please report" " to linux390@de.ibm.com", __LINE__, rc); BUG (); break; } return rc; } /* * function dasd_sleep_on_req * attempts to start the IO and waits for completion */ int dasd_sleep_on_req (ccw_req_t * cqr) { unsigned long flags; dasd_device_t *device = (dasd_device_t *) cqr->device; if (signal_pending(current)) { return -ERESTARTSYS; } s390irq_spin_lock_irqsave (device->devinfo.irq, flags); dasd_chanq_enq (&device->queue, cqr); /* let the bh start the request to keep them in order */ dasd_schedule_bh (device); s390irq_spin_unlock_irqrestore (device->devinfo.irq, flags); wait_event (device->wait_q, cqr->flags & CQR_FLAGS_FINALIZED); if (cqr->status == CQR_STATUS_FAILED) { return -EIO; } return 0; } /* end dasd_sleep_on_req */ /* * function dasd_sleep_on_immediate * same as dasd_sleep_on_req, but attempts to start the IO immediately * (killing the actual running IO). */ static int dasd_sleep_on_immediate (ccw_req_t *cqr) { unsigned long flags; dasd_device_t *device = (dasd_device_t *) cqr->device; if (signal_pending(current)) return -ERESTARTSYS; s390irq_spin_lock_irqsave (device->devinfo.irq, flags); /* terminate currently running IO */ if (device->queue.head->status == CQR_STATUS_IN_IO) { device->discipline->term_IO (device->queue.head); device->queue.head->status = CQR_STATUS_QUEUED; } dasd_chanq_enq_head (&device->queue, cqr); /* let the bh start the request to keep them in order */ dasd_schedule_bh (device); s390irq_spin_unlock_irqrestore (device->devinfo.irq, flags); wait_event (device->wait_q, cqr->flags & CQR_FLAGS_FINALIZED); if (cqr->status == CQR_STATUS_FAILED) { return -EIO; } return 0; } /* end dasd_sleep_on_immediate */ /* * function dasd_end_request * posts the buffer_cache about a finalized request * FIXME: for requests splitted to serveral cqrs */ static inline void dasd_end_request (struct request *req, int uptodate) { while (end_that_request_first (req, uptodate, DASD_NAME)) { } #ifndef DEVICE_NO_RANDOM add_blkdev_randomness (MAJOR (req->rq_dev)); #endif end_that_request_last (req); return; } /* * function dasd_get_queue * returns the queue corresponding to a device behind a kdev */ static request_queue_t * dasd_get_queue (kdev_t kdev) { dasd_device_t *device = dasd_device_from_kdev (kdev); if (!device) { return NULL; } return device->request_queue; } /* * function dasd_check_expire_time * check the request given as argument for expiration * and returns 0 if not yet expired, EIO else */ static inline int dasd_check_expire_time (ccw_req_t * cqr) { unsigned long long now; int rc = 0; now = get_clock (); if (cqr->expires && cqr->expires + cqr->startclk < now) { DBF_DEV_EVENT (DBF_WARNING, ((dasd_device_t *) cqr->device), "IO timeout 0x%08lx%08lx usecs in req %p", (long) (cqr->expires >> 44), (long) (cqr->expires >> 12), cqr); cqr->expires <<= 1; rc = -EIO; } return rc; } /* * function dasd_finalize_request * implemets the actions to perform, when a request is finally finished * namely in status CQR_STATUS_DONE || CQR_STATUS_FAILED */ static inline void dasd_finalize_request (ccw_req_t * cqr) { dasd_device_t *device = cqr->device; cqr->endclk = get_clock (); if (cqr->req) { #ifdef DASD_PROFILE if (dasd_profile_level == DASD_PROFILE_ON) { dasd_profile_add (cqr); } #endif dasd_end_request (cqr->req, (cqr->status == CQR_STATUS_DONE)); /* free request if nobody is waiting on it */ dasd_free_request (cqr, cqr->device); } else { if (cqr == device->init_cqr && /* bring late devices online */ device->level <= DASD_STATE_ONLINE ) { if (!timer_pending(&device->late_timer)) { init_timer(&device->late_timer); device->late_timer.function = dasd_enable_single_device; device->late_timer.data = (unsigned long) device; device->late_timer.expires = jiffies; add_timer(&device->late_timer); } else { mod_timer(&device->late_timer, jiffies); } } else { /* notify sleep_on_xxx about finished cqr */ cqr->flags |= CQR_FLAGS_FINALIZED; } /* notify sleeping task about finished postprocessing */ wake_up (&device->wait_q); } return; } /* * function dasd_process_queues * transfers the requests on the queue given as argument to the chanq * if possible, the request ist started on a fastpath */ static void dasd_process_queues (dasd_device_t * device) { unsigned long flags; struct request *req; request_queue_t *queue = device->request_queue; dasd_chanq_t *qp = &device->queue; int irq = device->devinfo.irq; ccw_req_t *final_requests = NULL; int chanq_max_size = DASD_CHANQ_MAX_SIZE; ccw_req_t *cqr = NULL, *temp; dasd_erp_postaction_fn_t erp_postaction; s390irq_spin_lock_irqsave (irq, flags); /* First we dechain the requests, processed with completed status */ while (qp->head && ((qp->head->status == CQR_STATUS_DONE ) || (qp->head->status == CQR_STATUS_FAILED) || (qp->head->status == CQR_STATUS_ERROR ) )) { dasd_erp_action_fn_t erp_action; ccw_req_t *erp_cqr = NULL; /* preprocess requests with CQR_STATUS_ERROR */ if (qp->head->status == CQR_STATUS_ERROR) { qp->head->retries--; if ((qp->head->dstat == NULL ) || ((qp->head->dstat->flag & DEVSTAT_FLAG_SENSE_AVAIL) == 0 ) || (device->discipline->erp_action == NULL ) || ((erp_action = device->discipline->erp_action (qp->head)) == NULL) ) { erp_cqr = dasd_default_erp_action (qp->head); } else { /* call discipline ERP action */ erp_cqr = erp_action (qp->head); } continue; } else if (qp->head->refers) { /* we deal with a finished ERP */ if (qp->head->status == CQR_STATUS_DONE) { DBF_DEV_EVENT (DBF_NOTICE, device, "%s", "ERP successful"); } else { DEV_MESSAGE (KERN_WARNING, device, "%s", "ERP unsuccessful"); } if ((device->discipline->erp_postaction == NULL )|| ((erp_postaction = device->discipline->erp_postaction (qp->head)) == NULL) ) { dasd_default_erp_postaction (qp->head); } else { /* call ERP postaction of discipline */ erp_postaction (qp->head); } continue; } /* dechain request now */ if (final_requests == NULL) final_requests = qp->head; cqr = qp->head; qp->head = qp->head->next; if (qp->head == NULL) qp->tail = NULL; } /* end while over completed requests */ if (cqr) cqr->next = NULL; /* terminate final_requests queue */ /* Now clean the requests with final status */ while (final_requests) { temp = final_requests; final_requests = temp->next; dasd_finalize_request (temp); } /* Now we try to fetch requests from the request queue */ for (temp = qp->head; temp != NULL; temp = temp->next) { if (temp->status == CQR_STATUS_QUEUED) chanq_max_size--; } while ((atomic_read(&device->plugged) == 0) && (queue) && (!queue->plugged) && (!list_empty (&queue->queue_head)) && (req = dasd_next_request (queue)) && (qp->head == NULL || chanq_max_size > 0)) { /* queue empty or certain critera fulfilled -> transfer */ cqr = NULL; if (is_read_only(device->kdev) && req->cmd == WRITE) { DBF_EVENT (DBF_ERR, "(%04x) Rejecting write request %p", device->devinfo.devno, req); dasd_dequeue_request (queue,req); dasd_end_request (req, 0); continue; } cqr = device->discipline->build_cp_from_req (device, req); if (cqr == NULL || IS_ERR(cqr)) { if (cqr == ERR_PTR(-ENOMEM)) { break; } MESSAGE (KERN_EMERG, "(%04x) CCW creation failed " "on request %p", device->devinfo.devno, req); dasd_dequeue_request (queue,req); dasd_end_request (req, 0); continue; } dasd_dequeue_request (queue, req); dasd_chanq_enq (qp, cqr); chanq_max_size--; } /* we process the requests with non-final status */ if (qp->head) { switch (qp->head->status) { case CQR_STATUS_QUEUED: /* try to start the first I/O that can be started */ if (device->discipline->start_IO == NULL) BUG (); device->discipline->start_IO(qp->head); break; case CQR_STATUS_IN_IO: /* Check, if to invoke the missing interrupt handler */ if (dasd_check_expire_time (qp->head)) { /* to be filled with MIH */ } break; default: MESSAGE (KERN_EMERG, "invalid cqr (%p) detected with status %02x ", qp->head, qp->head->status); BUG (); } } s390irq_spin_unlock_irqrestore (irq, flags); } /* end dasd_process_queues */ /* * function dasd_run_bh * acquires the locks needed and then runs the bh */ static void dasd_run_bh (dasd_device_t * device) { long flags; spin_lock_irqsave (&io_request_lock, flags); atomic_set (&device->bh_scheduled, 0); dasd_process_queues (device); spin_unlock_irqrestore (&io_request_lock, flags); } /* * function dasd_schedule_bh_timed * retriggers the dasd_schedule_bh function (called by timer queue) */ void dasd_schedule_bh_timed (unsigned long device_ptr) { dasd_device_t *device = (dasd_device_t *) device_ptr; dasd_schedule_bh (device); } /* * function dasd_schedule_bh * schedules the request_fn to run with next run_bh cycle */ void dasd_schedule_bh (dasd_device_t * device) { /* Protect against rescheduling, when already running */ if (atomic_compare_and_swap (0, 1, &device->bh_scheduled)) { return; } INIT_LIST_HEAD (&device->bh_tq.list); device->bh_tq.sync = 0; device->bh_tq.routine = (void *) (void *) dasd_run_bh; device->bh_tq.data = device; queue_task (&device->bh_tq, &tq_immediate); mark_bh (IMMEDIATE_BH); return; } /* * function do_dasd_request * is called from ll_rw_blk.c and provides the caller of * dasd_process_queues */ static void do_dasd_request (request_queue_t * queue) { dasd_device_t *device = (dasd_device_t *)queue->queuedata; dasd_process_queues (device); } /* * function dasd_handle_state_change_pending * * handles the state change pending interrupt. */ void dasd_handle_state_change_pending (devstat_t * stat) { dasd_device_t **device_addr, *device; ccw_req_t *cqr; device_addr = dasd_device_from_devno (stat->devno); if (!device_addr) return; device = *device_addr; if (!device) return; /* restart all 'running' IO on queue */ cqr = device->queue.head; while (cqr) { if (cqr->status == CQR_STATUS_IN_IO) { cqr->status = CQR_STATUS_QUEUED; } cqr = cqr->next; } DEV_MESSAGE (KERN_DEBUG, device, "%s", "device request queue restarted by " "state change pending interrupt"); del_timer_sync (&(device->blocking_timer)); device->stopped &= ~DASD_STOPPED_PENDING; dasd_schedule_bh (device); } /* end dasd_handle_state_change_pending */ /* * function dasd_int_handler * is the DASD driver's default interrupt handler for SSCH-IO */ void dasd_int_handler (int irq, void *ds, struct pt_regs *regs) { int ip; ccw_req_t *cqr; dasd_device_t *device; dasd_era_t era; devstat_t *stat = (devstat_t *)ds; if (stat == NULL) { BUG(); } DBF_EVENT (DBF_DEBUG, "Int: IRQ %02x, CS/DS %04x, flag %08x, devno %04x, ip %08x", irq, ((stat->cstat<<8)|stat->dstat), stat->flag, stat->devno, stat->intparm); /* first of all check for state change pending interrupt */ if ((stat->dstat & DEV_STAT_ATTENTION ) && (stat->dstat & DEV_STAT_DEV_END ) && (stat->dstat & DEV_STAT_UNIT_EXCEP) ) { DBF_EVENT (DBF_NOTICE, "State change Interrupt: %04x", stat->devno); dasd_handle_state_change_pending (stat); return; } ip = stat->intparm; if (!ip) { /* no intparm: unsolicited interrupt */ MESSAGE (KERN_DEBUG, "unsolicited interrupt: irq 0x%x devno %04x", irq, stat->devno); return; } if (ip & 0x80000001) { /* check for invalid 'cqr' address */ MESSAGE (KERN_DEBUG, "spurious interrupt: irq 0x%x devno %04x, parm %08x", irq, stat->devno,ip); return; } cqr = (ccw_req_t *)(long)ip; /* check status - the request might have been killed because of dyn dettach */ if (cqr->status != CQR_STATUS_IN_IO) { MESSAGE (KERN_DEBUG, "invalid status: irq 0x%x devno %04x, status %02x", irq, stat->devno, cqr->status); return; } /* some consistency checks */ device = (dasd_device_t *) cqr->device; if (device == NULL || device != ds-offsetof(dasd_device_t,dev_status)) { BUG(); } if (device->devinfo.irq != irq) { BUG(); } if (strncmp (device->discipline->ebcname, (char *) &cqr->magic, 4)) { BUG(); } /* first of all lets try to find out the appropriate era_action */ if (stat->flag & DEVSTAT_HALT_FUNCTION) { era = dasd_era_fatal; } else if (stat->flag & DEVSTAT_FINAL_STATUS && stat->dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && stat->cstat == 0) { /* received 'ok' for running IO */ era = dasd_era_none; } else if (stat->flag & DEVSTAT_FLAG_SENSE_AVAIL) { /* got sense data */ if (cqr->dstat == NULL) cqr->dstat = kmalloc (sizeof (devstat_t), GFP_ATOMIC); if (cqr->dstat) { memcpy (cqr->dstat, stat, sizeof (devstat_t)); } else { MESSAGE (KERN_DEBUG, "%s", "no memory for dstat...ignoring"); } #ifdef ERP_DEBUG if (device->discipline && device->discipline->dump_sense ) { device->discipline->dump_sense (device, cqr); } #endif if (device->discipline->examine_error == NULL) { era = dasd_era_recover; } else { era = device->discipline->examine_error (cqr, stat); } } else if (stat->flag & DEVSTAT_NOT_OPER) { /* path became offline or similar */ /* => retry to see if there are any other pathes available */ DEV_MESSAGE (KERN_DEBUG, device, "%s", "Device or a path became not operational while in IO"); era = dasd_era_recover; } else if (stat->dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END) || stat->cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN) ) { /* received device state apart from (channel end & device end) */ /* OR any kind of channel check (e.g. IFCC, DATA_CHECK or ..... */ /* we got no sense data, therefore we just retry */ DEV_MESSAGE (KERN_DEBUG, device, "Status without sense (IFCC,...) CS/DS %04x flag %08x", ((stat->cstat<<8)|stat->dstat), stat->flag); era = dasd_era_recover; } else { /* any other kind of interrupt - just retry */ DEV_MESSAGE (KERN_DEBUG, device, "Got unclassified interrupt CS/DS %04x flag %08x", ((stat->cstat<<8)|stat->dstat), stat->flag); era = dasd_era_recover; } switch (era) { case dasd_era_none: check_then_set(&cqr->status, CQR_STATUS_IN_IO, CQR_STATUS_DONE); cqr->stopclk = get_clock (); /* start the next queued request if possible -> fast_io */ if (cqr->next && cqr->next->status == CQR_STATUS_QUEUED) { if (device->discipline->start_IO (cqr->next) != 0) { MESSAGE (KERN_WARNING, "%s", "Interrupt fastpath failed!"); } } break; case dasd_era_fatal: check_then_set (&cqr->status, CQR_STATUS_IN_IO, CQR_STATUS_FAILED); cqr->stopclk = get_clock (); break; case dasd_era_recover: check_then_set (&cqr->status, CQR_STATUS_IN_IO, CQR_STATUS_ERROR); break; default: BUG (); } /* handle special device initialization request */ if ( cqr == device->init_cqr && ( cqr->status == CQR_STATUS_DONE || cqr->status == CQR_STATUS_FAILED )){ dasd_state_init_to_ready(device); if ( atomic_read(&dasd_init_pending) == 0) wake_up (&dasd_init_waitq); } dasd_schedule_bh (device); } /* end dasd_int_handler */ /******************************************************************************** * SECTION: Some stuff related to error recovery ********************************************************************************/ /* * DEFAULT_ERP_ACTION * * DESCRIPTION * just retries the current cqr * * PARAMETER * cqr failed CQR * * RETURN VALUES * cqr modified CQR */ ccw_req_t * dasd_default_erp_action (ccw_req_t * cqr) { dasd_device_t *device = cqr->device; // just retry - there is nothing to save ... I got no sense data.... if (cqr->retries > 0) { DEV_MESSAGE (KERN_DEBUG, device, "default ERP called (%i retries left)", cqr->retries); check_then_set (&cqr->status, CQR_STATUS_ERROR, CQR_STATUS_QUEUED); } else { DEV_MESSAGE (KERN_WARNING, device, "%s", "default ERP called (NO retry left)"); check_then_set (&cqr->status, CQR_STATUS_ERROR, CQR_STATUS_FAILED); cqr->stopclk = get_clock (); } return cqr; } /* end dasd_default_erp_action */ /* * DEFAULT_ERP_POSTACTION * * DESCRIPTION * Frees all ERPs of the current ERP Chain and set the status * of the original CQR either to CQR_STATUS_DONE if ERP was successful * or to CQR_STATUS_FAILED if ERP was NOT successful. * NOTE: This function is only called if no discipline postaction * is available * * PARAMETER * erp current erp_head * * RETURN VALUES * cqr pointer to the original CQR */ ccw_req_t * dasd_default_erp_postaction (ccw_req_t *erp) { ccw_req_t *cqr = NULL, *free_erp = NULL; dasd_device_t *device = erp->device; int success; if (erp->refers == NULL || erp->function == NULL ) { BUG (); } if (erp->status == CQR_STATUS_DONE) success = 1; else success = 0; /* free all ERPs - but NOT the original cqr */ while (erp->refers != NULL) { free_erp = erp; erp = erp->refers; /* remove the request from the device queue */ dasd_chanq_deq (&device->queue, free_erp); /* free the finished erp request */ dasd_free_request (free_erp, free_erp->device); } /* save ptr to original cqr */ cqr = erp; /* set corresponding status for original cqr */ if (success) { cqr->status = CQR_STATUS_DONE; } else { cqr->status = CQR_STATUS_FAILED; cqr->stopclk = get_clock (); } return cqr; } /* end default_erp_postaction */ /******************************************************************************** * SECTION: The helpers of the struct file_operations ********************************************************************************/ /* * function dasd_format * performs formatting of _device_ according to _fdata_ * Note: The discipline's format_function is assumed to deliver formatting * commands to format a single unit of the device. In terms of the ECKD * devices this means CCWs are generated to format a single track. */ static int dasd_format (dasd_device_t * device, format_data_t * fdata) { int rc = 0; int openct = atomic_read (&device->open_count); ccw_req_t *req; if (openct > 1) { DEV_MESSAGE (KERN_WARNING, device, "%s", "dasd_format: device is open! " "expect errors."); } DBF_DEV_EVENT (DBF_NOTICE, device, "formatting units %d to %d (%d B blocks) flags %d", fdata->start_unit, fdata->stop_unit, fdata->blksize, fdata->intensity); while ((!rc) && (fdata->start_unit <= fdata->stop_unit)) { if (device->discipline->format_device == NULL) break; req = device->discipline->format_device (device, fdata); if (req == NULL) { rc = -ENOMEM; break; } rc = dasd_sleep_on_req (req); dasd_free_request (req, device); /* request is no longer used */ if ( rc ) { if (rc != -ERESTARTSYS ) DEV_MESSAGE (KERN_WARNING, device, " Formatting of unit %d failed" " with rc = %d", fdata->start_unit, rc); break; } fdata->start_unit++; } return rc; } /* end dasd_format */ static struct list_head dasd_ioctls = LIST_HEAD_INIT (dasd_ioctls); static dasd_ioctl_list_t * dasd_find_ioctl (int no) { struct list_head *curr; list_for_each (curr, &dasd_ioctls) { if (list_entry (curr, dasd_ioctl_list_t, list)->no == no) { return list_entry (curr, dasd_ioctl_list_t, list); } } return NULL; } int dasd_ioctl_no_register (struct module *owner, int no, dasd_ioctl_fn_t handler) { dasd_ioctl_list_t *new; if (dasd_find_ioctl (no)) return -EBUSY; new = kmalloc (sizeof (dasd_ioctl_list_t), GFP_KERNEL); if (new == NULL) return -ENOMEM; new->owner = owner; new->no = no; new->handler = handler; list_add (&new->list, &dasd_ioctls); MOD_INC_USE_COUNT; return 0; } int dasd_ioctl_no_unregister (struct module *owner, int no, dasd_ioctl_fn_t handler) { dasd_ioctl_list_t *old = dasd_find_ioctl (no); if (old == NULL) return -ENOENT; if (old->no != no || old->handler != handler || owner != old->owner ) return -EINVAL; list_del (&old->list); kfree (old); MOD_DEC_USE_COUNT; return 0; } /* * handle the re-read partition table IOCTL (BLKRRPART) */ static int dasd_revalidate (dasd_device_t * device) { int rc = 0; int i; kdev_t kdev = device->kdev; int openct = atomic_read (&device->open_count); int start = MINOR (kdev); if (openct != 1) { DEV_MESSAGE (KERN_WARNING, device, "%s", "BLKRRPART: device is open! expect errors."); } for (i = (1 << DASD_PARTN_BITS) - 1; i >= 0; i--) { int major = device->major_info->gendisk.major; invalidate_device(MKDEV (major, start+i), 1); } dasd_destroy_partitions(device); dasd_setup_partitions(device); return rc; } /* * function do_dasd_ioctl * Implementation of the DASD API. * Changes to the API should be binary compatible to privous versions * of the user-space applications by means of any already existing tool * (e.g. dasdfmt) must work with the new kernel API. */ static int do_dasd_ioctl (struct inode *inp, /* unsigned */ int no, unsigned long data) { int rc = 0; dasd_device_t *device = dasd_device_from_kdev (inp->i_rdev); major_info_t *major_info; if (!device) { MESSAGE (KERN_WARNING, "No device registered as device (%d:%d)", MAJOR (inp->i_rdev), MINOR (inp->i_rdev)); return -EINVAL; } if ((_IOC_DIR (no) != _IOC_NONE) && (data == 0)) { PRINT_DEBUG ("empty data ptr"); return -EINVAL; } major_info = device->major_info; DBF_DEV_EVENT (DBF_DEBUG, device, "ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no, (_IOC_DIR (no) == _IOC_NONE ? "0" : _IOC_DIR (no) == _IOC_READ ? "r" : _IOC_DIR (no) == _IOC_WRITE ? "w" : _IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u"), _IOC_TYPE (no), _IOC_NR (no), _IOC_SIZE (no), data); switch (no) { case DASDAPIVER: { /* retrun dasd API version */ int ver = DASD_API_VERSION; rc = put_user(ver, (int *) data); break; } case BLKGETSIZE: { /* Return device size in # of sectors */ long blocks = major_info->gendisk.sizes [MINOR (inp->i_rdev)] << 1; rc = put_user(blocks, (long *) data); break; } case BLKGETSIZE64:{ u64 blocks = major_info->gendisk.sizes [MINOR (inp->i_rdev)]; rc = put_user(blocks << 10, (u64 *) data); break; } case BLKRRPART: { /* reread partition table */ if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } rc = dasd_revalidate (device); break; } case HDIO_GETGEO: { /* return disk geometry */ struct hd_geometry geo = { 0, }; rc = dasd_fillgeo (inp->i_rdev, &geo); if (rc) break; rc = copy_to_user ((struct hd_geometry *) data, &geo, sizeof (struct hd_geometry)); if (rc) rc = -EFAULT; break; } case BIODASDDISABLE: { /* disable device */ if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } if ( device->level > DASD_STATE_ACCEPT) { dasd_deactivate_queue(device); if ( device->request_queue) dasd_flush_request_queues(device,0); dasd_flush_chanq(device,0); dasd_disable_blkdev(device); dasd_set_device_level (device->devinfo.devno, device->discipline, DASD_STATE_ACCEPT); } break; } case BIODASDENABLE: { /* enable device */ dasd_range_t range = { from: device->devinfo.devno, to: device->devinfo.devno }; if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } dasd_enable_ranges (&range, device->discipline, 0); break; } case BIODASDFMT: { /* format device */ /* fdata == NULL is no longer a valid arg to dasd_format ! */ int partn = MINOR (inp->i_rdev) & ((1 << major_info->gendisk.minor_shift) - 1); format_data_t fdata; if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } if (dasd_features_from_devno(device->devinfo.devno)&DASD_FEATURE_READONLY) { rc = -EROFS; break; } if (!data) { rc = -EINVAL; break; } rc = copy_from_user (&fdata, (void *) data, sizeof (format_data_t)); if (rc) { rc = -EFAULT; break; } if (partn != 0) { DEV_MESSAGE (KERN_WARNING, device, "%s", "Cannot low-level format a partition"); return -EINVAL; } rc = dasd_format (device, &fdata); break; } case BIODASDGATTR: { /* Get Attributes (cache operations) */ attrib_data_t attrib; if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } if (!data) { rc = -EINVAL; break; } if (!device->discipline->get_attrib) { rc = -EINVAL; break; } device->discipline->get_attrib (device, &attrib); rc = copy_to_user ((void *) data, &attrib, sizeof (attrib_data_t)); if (rc) { rc = -EFAULT; } break; } case BIODASDSATTR: { /* Set Attributes (cache operations) */ attrib_data_t attrib; if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } if (!data) { rc = -EINVAL; break; } if (!device->discipline->set_attrib) { rc = -EINVAL; break; } rc = copy_from_user (&attrib, (void *) data, sizeof (attrib_data_t)); if (rc) { rc = -EFAULT; break; } rc = device->discipline->set_attrib (device, &attrib); break; } case BIODASDPRRST: { /* reset device profile information */ if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } memset (&device->profile, 0, sizeof (dasd_profile_info_t)); break; } case BIODASDPRRD: { /* return device profile information */ rc = copy_to_user((long *)data, (long *)&device->profile, sizeof(dasd_profile_info_t)); if (rc) rc = -EFAULT; break; } case BIODASDRSRV: { /* reserve device */ ccw_req_t *cqr; if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } if (!device->discipline->reserve) { rc = -EINVAL; break; } cqr = device->discipline->reserve (device); if (cqr) { struct timer_list res_timer; init_timer (&res_timer); res_timer.function = dasd_resrel_timeout; res_timer.data = (unsigned long) cqr; res_timer.expires = jiffies + 2 * HZ; add_timer (&res_timer); rc = dasd_sleep_on_immediate (cqr); del_timer_sync (&res_timer); dasd_free_request (cqr, device); } else { rc = -ENOMEM; } break; } case BIODASDRLSE: { /* release device */ ccw_req_t *cqr; if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } if (!device->discipline->release) { rc = -EINVAL; break; } cqr = device->discipline->release (device); if (cqr) { struct timer_list rel_timer; init_timer (&rel_timer); rel_timer.function = dasd_resrel_timeout; rel_timer.data = (unsigned long) cqr; rel_timer.expires = jiffies + 2 * HZ; add_timer (&rel_timer); rc = dasd_sleep_on_immediate (cqr); del_timer_sync (&rel_timer); /* in case of interrupt */ dasd_free_request (cqr, device); } else { rc = -ENOMEM; } break; } case BIODASDSLCK: { /* steal lock - unconditional reserve device */ if (!capable (CAP_SYS_ADMIN)) { rc = -EACCES; break; } rc = dasd_steal_lock (device); break; } case BIODASDINFO: /* return dasd information */ case BIODASDINFO2: { /* return dasd information2 (incl. format and features) */ dasd_information2_t dasd_info; unsigned long flags; if (!device->discipline->fill_info) { rc = -EINVAL; break; } rc = device->discipline->fill_info (device, &dasd_info); dasd_info.label_block = device->sizes.pt_block; dasd_info.devno = device->devinfo.devno; dasd_info.schid = device->devinfo.irq; dasd_info.cu_type = device->devinfo.sid_data.cu_type; dasd_info.cu_model = device->devinfo.sid_data.cu_model; dasd_info.dev_type = device->devinfo.sid_data.dev_type; dasd_info.dev_model = device->devinfo.sid_data.dev_model; dasd_info.open_count = atomic_read (&device->open_count); dasd_info.status = device->level; /* check if device is really formatted - LDL / CDL was returned by 'fill_info' */ if ((device->level < DASD_STATE_READY) || (dasd_check_bp_block (device) ) ) { dasd_info.format = DASD_FORMAT_NONE; } dasd_info.features = dasd_features_from_devno (device->devinfo.devno); if (device->discipline) { memcpy (dasd_info.type, device->discipline->name, 4); } else { memcpy (dasd_info.type, "none", 4); } dasd_info.req_queue_len = 0; dasd_info.chanq_len = 0; if ((device->request_queue ) && (device->request_queue->request_fn) ) { struct list_head *l; ccw_req_t *cqr = device->queue.head; spin_lock_irqsave (&io_request_lock, flags); list_for_each (l, &device->request_queue-> queue_head) { dasd_info.req_queue_len++; } spin_unlock_irqrestore (&io_request_lock, flags); s390irq_spin_lock_irqsave (device->devinfo.irq, flags); while (cqr) { cqr = cqr->next; dasd_info.chanq_len++; } s390irq_spin_unlock_irqrestore (device->devinfo. irq, flags); } rc = copy_to_user ((long *) data, (long *) &dasd_info, ((no == (unsigned int) BIODASDINFO2) ? sizeof (dasd_information2_t) : sizeof (dasd_information_t))); if (rc) rc = -EFAULT; break; } case BIODASDPSRD: { /* Performance Statistics Read */ ccw_req_t *cqr; dasd_rssd_perf_stats_t *stats; if ((!device->discipline->read_stats) || (!device->discipline->ret_stats ) ) { rc = -EINVAL; break; } cqr = device->discipline->read_stats (device); if (cqr) { if ((rc = dasd_sleep_on_req (cqr)) == 0) { if ((stats = device->discipline->ret_stats (cqr)) != NULL) { rc = copy_to_user ((long *) data, (long *) stats, sizeof (dasd_rssd_perf_stats_t)); } else { rc = -EFAULT; } } dasd_free_request (cqr, device); } else { rc = -ENOMEM; } break; } #if 0 /* needed for XFS */ case BLKBSZSET: { int bsz; rc = copy_from_user ((long *)&bsz,(long *)data,sizeof(int)); if ( rc ) { rc = -EFAULT; } else { if ( bsz >= device->sizes.bp_block ) rc = blk_ioctl (inp->i_rdev, no, data); else rc = -EINVAL; } break; } #endif /* 0 */ case BLKROSET: { int intval; dasd_range_t *temp; int devindex = 0; unsigned long flags; struct list_head *l; int major=MAJOR(device->kdev); int minor; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (inp->i_rdev != device->kdev) // ro setting is not allowed for partitions return -EINVAL; if (get_user(intval, (int *)(data))) return -EFAULT; spin_lock_irqsave (&range_lock, flags); list_for_each (l, &dasd_range_head.list) { temp = list_entry (l, dasd_range_t, list); if (device->devinfo.devno >= temp->from && device->devinfo.devno <= temp->to) { spin_unlock_irqrestore (&range_lock, flags); if (intval) temp->features |= DASD_FEATURE_READONLY; else temp->features &= ~DASD_FEATURE_READONLY; goto continue_blkroset; } devindex += temp->to - temp->from + 1; } spin_unlock_irqrestore (&range_lock, flags); return(-ENODEV); continue_blkroset: for (minor = MINOR(device->kdev); minor < MINOR(device->kdev) + (1 << DASD_PARTN_BITS); minor++) set_device_ro(MKDEV(major,minor), intval); return 0; } case BLKBSZGET: case BLKSSZGET: case BLKROGET: case BLKRASET: case BLKRAGET: case BLKFLSBUF: case BLKPG: case BLKELVGET: case BLKELVSET: return blk_ioctl (inp->i_rdev, no, data); break; default: { dasd_ioctl_list_t *old = dasd_find_ioctl (no); if (old) { if ( old->owner ) __MOD_INC_USE_COUNT(old->owner); rc = old->handler (inp, no, data); if ( old->owner ) __MOD_DEC_USE_COUNT(old->owner); } else { DBF_DEV_EVENT (DBF_INFO, device, "unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no, (_IOC_DIR (no) == _IOC_NONE ? "0" : _IOC_DIR (no) == _IOC_READ ? "r" : _IOC_DIR (no) == _IOC_WRITE ? "w" : _IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u"), _IOC_TYPE (no), _IOC_NR (no), _IOC_SIZE (no), data); rc = -ENOTTY; } break; } } return rc; } /******************************************************************************** * SECTION: The members of the struct file_operations ********************************************************************************/ static int dasd_ioctl (struct inode *inp, struct file *filp, unsigned int no, unsigned long data) { int rc = 0; if ((!inp) || !(inp->i_rdev)) { return -EINVAL; } rc = do_dasd_ioctl (inp, no, data); return rc; } static int dasd_open (struct inode *inp, struct file *filp) { int rc = 0; unsigned long flags; dasd_device_t *device; if ((!inp) || !(inp->i_rdev)) { rc = -EINVAL; goto fail; } if (dasd_probeonly) { MESSAGE (KERN_INFO, "No access to device (%d:%d) due to probeonly mode", MAJOR (inp->i_rdev), MINOR (inp->i_rdev)); rc = -EPERM; goto fail; } spin_lock_irqsave(&discipline_lock,flags); device = dasd_device_from_kdev (inp->i_rdev); if (!device) { MESSAGE (KERN_WARNING, "No device registered as (%d:%d)", MAJOR (inp->i_rdev), MINOR (inp->i_rdev)); rc = -ENODEV; goto unlock; } if (device->level <= DASD_STATE_ACCEPT ) { DBF_DEV_EVENT (DBF_ERR, device, " %s", " Cannot open unrecognized device"); rc = -ENODEV; goto unlock; } if (atomic_inc_return (&device->open_count) == 1 ) { if ( device->discipline->owner ) __MOD_INC_USE_COUNT(device->discipline->owner); } unlock: spin_unlock_irqrestore(&discipline_lock,flags); fail: return rc; } /* * DASD_RELEASE * * DESCRIPTION */ static int dasd_release (struct inode *inp, struct file *filp) { int rc = 0; int count; dasd_device_t *device; if ((!inp) || !(inp->i_rdev)) { rc = -EINVAL; goto out; } device = dasd_device_from_kdev (inp->i_rdev); if (!device) { MESSAGE (KERN_WARNING, "No device registered as %d:%d", MAJOR (inp->i_rdev), MINOR (inp->i_rdev)); rc = -EINVAL; goto out; } if (device->level < DASD_STATE_ACCEPT ) { DBF_DEV_EVENT (DBF_ERR, device, " %s", " Cannot release unrecognized device"); rc = -ENODEV; goto out; } count = atomic_dec_return (&device->open_count); if ( count == 0) { invalidate_buffers (inp->i_rdev); if ( device->discipline->owner ) __MOD_DEC_USE_COUNT(device->discipline->owner); } else if ( count == -1 ) { /* paranoia only */ atomic_set (&device->open_count,0); MESSAGE (KERN_WARNING, "%s", "release called with open count==0"); } out: return rc; } static struct block_device_operations dasd_device_operations = { owner:THIS_MODULE, open:dasd_open, release:dasd_release, ioctl:dasd_ioctl, }; /******************************************************************************** * SECTION: Management of device list ********************************************************************************/ int dasd_fillgeo(int kdev,struct hd_geometry *geo) { dasd_device_t *device = dasd_device_from_kdev (kdev); if (!device) return -EINVAL; if (!device->discipline->fill_geometry) return -EINVAL; device->discipline->fill_geometry (device, geo); geo->start = device->major_info->gendisk.part[MINOR(kdev)].start_sect >> device->sizes.s2b_shift;; return 0; } /* This one is needed for naming 18000+ possible dasd devices */ int dasd_device_name (char *str, int index, int partition, struct gendisk *hd) { major_info_t *major_info; struct list_head *l; char first, second, third; int len; if (hd == NULL) return -EINVAL; major_info = NULL; list_for_each (l, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); if (&major_info->gendisk == hd) break; index += DASD_PER_MAJOR; } if (major_info == NULL || &major_info->gendisk != hd) { /* list empty or hd not found in list */ return -EINVAL; } len = 0; third = index % 26; second = ((index - 26) / 26) % 26; first = (((index - 702) / 26) / 26) % 26; len = sprintf (str, "dasd"); if (index > 701) { len += sprintf (str + len, "%c", first + 'a'); } if (index > 25) { len += sprintf (str + len, "%c", second + 'a'); } len += sprintf (str + len, "%c", third + 'a'); if (partition) { if (partition > 9) { return -EINVAL; } else { len += sprintf (str + len, "%d", partition); } } str[len] = '\0'; return 0; } static void dasd_plug_device (dasd_device_t * device) { atomic_set(&device->plugged,1); } static void dasd_unplug_device (dasd_device_t * device) { atomic_set(&device->plugged,0); dasd_schedule_bh(device); } static void dasd_flush_chanq ( dasd_device_t * device, int destroy ) { ccw_req_t *cqr; unsigned long flags; if ( destroy ) { s390irq_spin_lock_irqsave (device->devinfo.irq, flags); cqr = device->queue.head; while ( cqr != NULL ) { if ( cqr->status == CQR_STATUS_IN_IO ) device->discipline->term_IO (cqr); if ( cqr->status != CQR_STATUS_DONE && cqr->status != CQR_STATUS_FAILED ) { cqr->status = CQR_STATUS_FAILED; cqr->stopclk = get_clock (); } dasd_schedule_bh(device); cqr = cqr->next; } s390irq_spin_unlock_irqrestore (device->devinfo.irq, flags); } wait_event( device->wait_q, device->queue.head == NULL ); } static void dasd_flush_request_queues ( dasd_device_t * device, int destroy ) { int i; int major = MAJOR(device->kdev); int minor = MINOR(device->kdev); for ( i = 0; i < (1 << DASD_PARTN_BITS); i ++) { if ( destroy ) destroy_buffers(MKDEV(major,minor+i)); else invalidate_buffers(MKDEV(major,minor+i)); } } static inline void dasd_do_hotplug_event (dasd_device_t* device, int eventid) { #ifdef CONFIG_HOTPLUG int i; char *argv[3], *envp[8]; char devno[20],major[20],minor[20],devname[26],action[20]; /* setup command line arguments */ i=0; argv[i++] = hotplug_path; argv[i++] = "dasd"; argv[i++] = 0; /* minimal environment */ i=0; envp[i++] = "HOME=/"; envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; /* device information and event*/ sprintf (devno, "DEVNO=%04x", device->devinfo.devno); sprintf (major, "MAJOR=%d", MAJOR(device->kdev)); sprintf (minor, "MINOR=%d", MINOR(device->kdev)); sprintf (devname, "DASDNAME=%s",device->name); switch (eventid) { case DASD_HOTPLUG_EVENT_ADD: sprintf (action,"ACTION=add"); break; case DASD_HOTPLUG_EVENT_REMOVE: sprintf (action,"ACTION=remove"); break; case DASD_HOTPLUG_EVENT_PARTCHK: sprintf (action,"ACTION=partchk"); break; case DASD_HOTPLUG_EVENT_PARTREMOVE: sprintf (action,"ACTION=partremove"); break; default: BUG(); } envp[i++] = devno; envp[i++] = major; envp[i++] = minor; envp[i++] = devname; envp[i++] = action; envp[i++] = 0; call_usermodehelper (argv [0], argv, envp); #endif } static int dasd_disable_volume ( dasd_device_t * device, int force ) { int rc = 0; int target = DASD_STATE_KNOWN; int count = atomic_read (&device->open_count); if ( count ) { DEV_MESSAGE (KERN_EMERG, device, "%s", "device has vanished although it was open!"); } if ( force ) { dasd_deactivate_queue(device); dasd_flush_chanq(device,force); dasd_flush_request_queues(device,force); dasd_disable_blkdev(device); target = DASD_STATE_DEL; } /* unregister partitions ('ungrok_partitions') */ devfs_register_partitions(&device->major_info->gendisk, MINOR(device->kdev),1); dasd_do_hotplug_event (device, DASD_HOTPLUG_EVENT_PARTREMOVE); DBF_DEV_EVENT (DBF_ERR, device, "disabling device, target state: %d", target); dasd_set_device_level (device->devinfo.devno, device->discipline, target); return rc; } static void dasd_disable_ranges (dasd_range_t *range, dasd_discipline_t *discipline, int all, int force ) { dasd_device_t **dptr; dasd_device_t *device; dasd_range_t *rrange; int j; if (range == &dasd_range_head) { rrange = list_entry (range->list.next, dasd_range_t, list); } else { rrange = range; } do { for (j = rrange->from; j <= rrange->to; j++) { dptr = dasd_device_from_devno(j); if (dptr == NULL) { continue; } device = *dptr; if (device == NULL || (discipline != NULL && device -> discipline != discipline)) continue; dasd_disable_volume(device, force); } if (rrange->list.next == NULL) break; rrange = list_entry (rrange->list.next, dasd_range_t, list); } while ( all && rrange && rrange != range ); } static void dasd_enable_single_device ( unsigned long arg ) { dasd_device_t * device =(dasd_device_t *) arg; int devno = device->devinfo.devno; dasd_range_t range = { from: devno, to:devno }; dasd_enable_ranges (&range,NULL,0); } static void dasd_enable_ranges (dasd_range_t *range, dasd_discipline_t *discipline, int all) { int retries = 0; int j; int do_again; kdev_t tempdev; dasd_range_t *rrange; if (range == NULL) return; do { do_again = 0; if (range == &dasd_range_head) { rrange = list_entry (range->list.next, dasd_range_t, list); } else { rrange = range; } do { for (j = rrange->from; j <= rrange->to; j++) { if ( dasd_devindex_from_devno(j) < 0 ) continue; if (-EAGAIN == dasd_set_device_level (j, discipline, DASD_STATE_ONLINE)) do_again = 1; } rrange = list_entry (rrange->list.next, dasd_range_t, list); } while ( all && rrange && rrange != range ); if ((atomic_read (&dasd_init_pending) == 0) && (!do_again)) /* we are done, exit loop */ break; if ( retries == 0 ) { MESSAGE (KERN_INFO, "%s", "waiting for responses..."); } else if ( retries < 5 ) { DBF_EVENT (DBF_NOTICE, "%s", "waiting a little bit longer..."); } else { MESSAGE (KERN_INFO, "%s", "giving up, enable late devices manually!"); break; } /* prevent scheduling if called by bh (timer) */ if (!in_interrupt()) { interruptible_sleep_on_timeout (&dasd_init_waitq, (1 * HZ) ); } retries ++; } while (1); /* now setup block devices */ /* Now do block device and partition setup */ if (range == &dasd_range_head) { rrange = list_entry (range->list.next, dasd_range_t, list); } else { rrange = range; } do { for (j = rrange->from; j <= rrange->to; j++) { dasd_device_t **dptr; dasd_device_t *device; if ( dasd_devindex_from_devno(j) < 0 ) continue; dptr = dasd_device_from_devno(j); device = *dptr; if (device == NULL ) continue; if ( ((discipline == NULL && device->discipline != NULL) || (device->discipline == discipline )) && device->level == DASD_STATE_ONLINE && device->request_queue == NULL ) { if (dasd_features_from_devno(j)&DASD_FEATURE_READONLY) { for (tempdev=device->kdev; tempdev<(device->kdev +(1 << DASD_PARTN_BITS)); tempdev++) set_device_ro (tempdev, 1); DEV_MESSAGE (KERN_WARNING, device, "%s", "setting read-only mode "); } dasd_setup_blkdev(device); dasd_setup_partitions(device); } } rrange = list_entry (rrange->list.next, dasd_range_t, list); } while ( all && rrange && rrange != range ); } #ifdef CONFIG_DASD_DYNAMIC /* * DASD_NOT_OPER_HANDLER * * DESCRIPTION * handles leaving devices */ static void dasd_not_oper_handler (int irq, int status) { dasd_device_t *device; major_info_t *major_info; ccw_req_t* cqr; struct list_head *l; unsigned long flags; int i, devno; /* find out devno of leaving device: CIO has already deleted this information ! */ devno = -ENODEV; device = NULL; list_for_each (l, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); for (i = 0; i < DASD_PER_MAJOR; i++) { device = major_info->dasd_device[i]; if (device && device->devinfo.irq == irq) { devno = device->devinfo.devno; break; } } if (devno != -ENODEV) break; } if (devno < 0) { MESSAGE (KERN_WARNING, "not_oper_handler called on irq 0x%04x no devno!", irq); return; } switch (status) { case DEVSTAT_DEVICE_GONE: case DEVSTAT_REVALIDATE: //FIXME DEV_MESSAGE (KERN_DEBUG, device, "%s", "device is gone, disabling it permanently\n"); dasd_disable_volume(device, 1); break; case DEVSTAT_NOT_ACC: case DEVSTAT_NOT_ACC_ERR: DEV_MESSAGE (KERN_DEBUG, device, "%s", "device is not accessible, disabling it temporary\n"); s390irq_spin_lock_irqsave (device->devinfo.irq, flags); device->stopped |= DASD_STOPPED_NOT_ACC; if (status == DEVSTAT_NOT_ACC_ERR) { cqr = device->queue.head; while (cqr) { if (cqr->status == CQR_STATUS_QUEUED) break; if (cqr->status == CQR_STATUS_IN_IO) cqr->status = CQR_STATUS_QUEUED; cqr = cqr->next; } } s390irq_spin_unlock_irqrestore(device->devinfo.irq, flags); break; default: panic ("dasd not operational handler was called with illegal status\n"); } } /* * DASD_OPER_HANDLER * * DESCRIPTION * called by the machine check handler to make an device operational */ int dasd_oper_handler (int irq, devreg_t * devreg) { int devno; int rc = 0; major_info_t *major_info; dasd_range_t range; dasd_device_t *device; struct list_head *l; unsigned long flags; int i; devno = get_devno_by_irq (irq); if (devno == -ENODEV) { rc = -ENODEV; goto out; } /* find out devno of device */ device = NULL; list_for_each (l, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); for (i = 0; i < DASD_PER_MAJOR; i++) { device = major_info->dasd_device[i]; if (device && device->devinfo.irq == irq) break; else device = NULL; } if (device) break; } if (device && device->level >= DASD_STATE_READY) { s390irq_spin_lock_irqsave (device->devinfo.irq, flags); DEV_MESSAGE (KERN_DEBUG, device, "%s", "device is accessible again, reenabling it\n"); device->stopped &= ~DASD_STOPPED_NOT_ACC; s390irq_spin_unlock_irqrestore(device->devinfo.irq, flags); dasd_schedule_bh(device); } else { if (dasd_autodetect) { dasd_add_range (devno, devno, DASD_FEATURE_DEFAULT); } range.from = devno; range.to = devno; dasd_enable_ranges (&range, NULL, 0); } out: return rc; } #endif /* CONFIG_DASD_DYNAMIC */ static inline dasd_device_t ** dasd_find_device_addr ( int devno ) { dasd_device_t **device_addr; DBF_EVENT (DBF_INFO, "devno %04x", devno); if ( dasd_devindex_from_devno (devno) < 0 ) { DBF_EXC (DBF_ALERT, "no dasd: devno %04x", devno); return NULL; } /* allocate major numbers on demand for new devices */ while ((device_addr = dasd_device_from_devno (devno)) == NULL) { int rc; if ((rc = dasd_register_major (NULL)) <= 0) { DBF_EXC (DBF_ALERT, "%s", "out of major numbers!"); break; } } return device_addr; } static inline int dasd_state_del_to_new (dasd_device_t **addr, int devno) { int i; dasd_device_t* device; dasd_lowmem_t *lowmem; int rc; /* allocate device descriptor on demand for new device */ if (*addr != NULL) { BUG (); } device = kmalloc (sizeof (dasd_device_t), GFP_ATOMIC); if (device == NULL) { return -ENOMEM; } memset (device, 0, sizeof (dasd_device_t)); dasd_plug_device (device); INIT_LIST_HEAD (&device->lowmem_pool); /* allocate pages for lowmem pool */ for (i = 0; i < DASD_LOWMEM_PAGES; i++) { lowmem = (void *) get_free_page (GFP_ATOMIC|GFP_DMA); if (lowmem == NULL) { break; } list_add (&lowmem->list, &device->lowmem_pool); } if (i < DASD_LOWMEM_PAGES) { /* didn't get the needed lowmem pages */ list_for_each_entry (lowmem, &device->lowmem_pool, list) { MESSAGE (KERN_DEBUG, "<devno: %04x> not enough memory - " "Free page again :%p", devno, lowmem); free_page ((unsigned long) lowmem); } kfree (device); rc = -ENOMEM; } else { *addr = device; rc = 0; } return rc; } static inline int dasd_state_new_to_del (dasd_device_t **addr, int devno) { dasd_lowmem_t *lowmem; dasd_device_t *device = *addr; /* free private area */ if (device && device->private) { kfree(device->private); } /* free lowmem_pool */ list_for_each_entry (lowmem, &device->lowmem_pool, list) { free_page ((unsigned long) lowmem); } /* free device */ kfree(device); *addr = NULL; return 0; } static inline int dasd_state_new_to_known (dasd_device_t **dptr, int devno, dasd_discipline_t *discipline) { int rc = 0; umode_t devfs_perm = S_IFBLK | S_IRUSR | S_IWUSR; struct list_head *l; major_info_t *major_info, *tmp; int i; dasd_device_t *device = *dptr; devfs_handle_t dir; char buffer[5]; major_info = NULL; list_for_each (l, &dasd_major_info) { tmp = list_entry (l, major_info_t, list); for (i = 0; i < DASD_PER_MAJOR; i++) { if (tmp->dasd_device[i] == device) { device->kdev = MKDEV (tmp->gendisk.major, i << DASD_PARTN_BITS); major_info = tmp; break; } } if (major_info != NULL) /* we found one */ break; } if ( major_info == NULL ) BUG(); device->major_info = major_info; dasd_device_name (device->name, (((long)dptr - (long)device->major_info->dasd_device) / sizeof (dasd_device_t *)), 0, &device->major_info->gendisk); init_waitqueue_head (&device->wait_q); rc = get_dev_info_by_devno (devno, &device->devinfo); if ( rc ) { /* returns -EUSERS if boxed !!*/ if (rc == -EUSERS) { device->level = DASD_STATE_BOXED; } goto out; } DBF_EVENT (DBF_NOTICE, "got devinfo CU-type %04x and dev-type %04x", device->devinfo.sid_data.cu_type, device->devinfo.sid_data.dev_type); if ( devno != device->devinfo.devno ) BUG(); device->discipline = dasd_find_disc (device, discipline); if ( device->discipline == NULL ) { rc = -ENODEV; goto out; } sprintf (buffer, "%04x", device->devinfo.devno); dir = devfs_mk_dir (dasd_devfs_handle, buffer, device); device->major_info->gendisk.de_arr[MINOR(device->kdev) >> DASD_PARTN_BITS] = dir; if (dasd_features_from_devno(device->devinfo.devno)&DASD_FEATURE_READONLY) { devfs_perm &= ~(S_IWUSR); } device->devfs_entry = devfs_register (dir,"device",DEVFS_FL_DEFAULT, MAJOR(device->kdev), MINOR(device->kdev), devfs_perm, &dasd_device_operations,NULL); dasd_do_hotplug_event (device, DASD_HOTPLUG_EVENT_ADD); device->level = DASD_STATE_KNOWN; out: return rc; } static inline int dasd_state_known_to_new (dasd_device_t *device ) { int rc = 0; /* don't reset to zeros because of persistent data durich detach/attach! */ devfs_unregister(device->devfs_entry); devfs_unregister(device->major_info->gendisk.de_arr[MINOR(device->kdev) >> DASD_PARTN_BITS]); dasd_do_hotplug_event (device, DASD_HOTPLUG_EVENT_REMOVE); return rc; } static inline int dasd_state_known_to_accept (dasd_device_t *device) { int rc = 0; /* register 'device' debug area, used for all DBF_DEV_XXX calls*/ device->debug_area = debug_register (device->name, 0, /* size of debug area */ 2, /* number of areas */ 8 * sizeof (long)); debug_register_view (device->debug_area, &debug_sprintf_view); debug_set_level (device->debug_area, DBF_ERR); DBF_DEV_EVENT (DBF_EMERG, device, "%s", "debug area created"); if (device->discipline->int_handler) { rc = s390_request_irq_special (device->devinfo.irq, device->discipline->int_handler, dasd_not_oper_handler, SA_DOPATHGROUP, DASD_NAME, &device->dev_status); if ( rc ) { MESSAGE (KERN_DEBUG, "%s", "No request IRQ"); if (rc == -EUSERS) { /* Device is reserved by someone else. */ device->level = DASD_STATE_BOXED; } goto out; } } device->level = DASD_STATE_ACCEPT; out: return rc; } static inline int dasd_state_accept_to_known (dasd_device_t *device ) { if ( device->discipline == NULL ) goto out; if (device->discipline->int_handler) { free_irq (device->devinfo.irq, &device->dev_status); } DBF_DEV_EVENT (DBF_EMERG, device, "%p debug area deleted", device); if (device->debug_area != NULL) { debug_unregister (device->debug_area); device->debug_area = NULL; } device->discipline = NULL; device->level = DASD_STATE_KNOWN; out: return 0; } static inline int dasd_state_accept_to_init (dasd_device_t *device) { int rc = 0; unsigned long flags; if ( device->discipline->init_analysis ) { device->init_cqr=device->discipline->init_analysis (device); if ( device->init_cqr != NULL ) { if ( device->discipline->start_IO == NULL ) BUG(); atomic_inc (&dasd_init_pending); s390irq_spin_lock_irqsave (device->devinfo.irq, flags); rc = device->discipline->start_IO (device->init_cqr); if ( ! rc ) device->level = DASD_STATE_INIT; s390irq_spin_unlock_irqrestore(device->devinfo.irq, flags); } else { rc = -ENOMEM; } } else { rc = dasd_state_init_to_ready ( device ); } return rc; } static inline int dasd_state_init_to_ready (dasd_device_t *device ) { int rc = 0; if (device->discipline->do_analysis != NULL) if ( device->discipline->do_analysis (device) == 0 ) rc = dasd_check_bp_block (device); if ( device->init_cqr ) { /* This pointer is no longer needed, BUT dont't free the */ /* memory, because this is done in bh for finished request!!!! */ atomic_dec(&dasd_init_pending); device->init_cqr = NULL; } device->level = DASD_STATE_READY; return rc; } static inline int dasd_state_ready_to_accept (dasd_device_t *device ) { int rc = 0; unsigned long flags; s390irq_spin_lock_irqsave (device->devinfo.irq, flags); if ( device->init_cqr != NULL && atomic_read(&dasd_init_pending) != 0 ) { if ( device->discipline->term_IO == NULL ) BUG(); device->discipline->term_IO (device->init_cqr); atomic_dec (&dasd_init_pending); dasd_free_request (device->init_cqr, device); device->init_cqr = NULL; } s390irq_spin_unlock_irqrestore(device->devinfo.irq, flags); memset(&device->sizes,0,sizeof(dasd_sizes_t)); device->level = DASD_STATE_ACCEPT; return rc; } static inline int dasd_state_ready_to_online (dasd_device_t *device ) { int rc = 0; if (!(rc = dasd_check_bp_block (device))) { dasd_unplug_device (device); device->level = DASD_STATE_ONLINE; } return rc; } static inline int dasd_state_online_to_ready (dasd_device_t *device ) { int rc = 0; dasd_plug_device (device); device->level = DASD_STATE_READY; return rc; } static inline int dasd_setup_blkdev (dasd_device_t *device ) { int rc = 0; int i; int major = MAJOR(device->kdev); int minor = MINOR(device->kdev); request_queue_t *request_queue; for (i = 0; i < (1 << DASD_PARTN_BITS); i++) { if (i == 0) device->major_info->gendisk.sizes[minor] = (device->sizes.blocks << device-> sizes.s2b_shift) >> 1; else device->major_info->gendisk.sizes[minor + i] = 0; hardsect_size[major][minor + i] = device->sizes.bp_block; blksize_size[major][minor + i] = device->sizes.bp_block; max_sectors[major][minor + i] = device->discipline->max_blocks << device->sizes.s2b_shift; device->major_info->gendisk.part[minor+i].start_sect = 0; device->major_info->gendisk.part[minor+i].nr_sects = 0; } request_queue = kmalloc(sizeof(request_queue_t),GFP_KERNEL); if (request_queue) { request_queue->queuedata = device; blk_init_queue (request_queue, do_dasd_request); blk_queue_headactive (request_queue, 1); elevator_init (&(request_queue->elevator),ELEVATOR_NOOP); } device->request_queue = request_queue; return rc; } static void dasd_deactivate_queue (dasd_device_t *device) { int i; int minor = MINOR(device->kdev); for (i = 0; i < (1 << DASD_PARTN_BITS); i++) { device->major_info->gendisk.sizes[minor + i] = 0; } } static inline int dasd_disable_blkdev (dasd_device_t *device ) { int i; int major = MAJOR(device->kdev); int minor = MINOR(device->kdev); request_queue_t *q = device->request_queue; struct request *req; long flags; spin_lock_irqsave(&io_request_lock, flags); while (q && !list_empty(&q->queue_head) && (req = dasd_next_request(q)) != NULL) { dasd_end_request(req, 0); dasd_dequeue_request(q, req); } spin_unlock_irqrestore(&io_request_lock, flags); for (i = 0; i < (1 << DASD_PARTN_BITS); i++) { destroy_buffers(MKDEV(major,minor+i)); device->major_info->gendisk.sizes[minor + i] = 0; hardsect_size[major][minor + i] = 0; blksize_size[major][minor + i] = 0; max_sectors[major][minor + i] = 0; } if (device->request_queue) { blk_cleanup_queue (device->request_queue); kfree(device->request_queue); device->request_queue = NULL; } return 0; } /* * function dasd_setup_partitions * calls the function in genhd, which is appropriate to setup a partitioned disk */ static inline void dasd_setup_partitions ( dasd_device_t * device ) { register_disk (&device->major_info->gendisk, device->kdev, 1 << DASD_PARTN_BITS, &dasd_device_operations, (device->sizes.blocks << device->sizes.s2b_shift)); dasd_do_hotplug_event (device, DASD_HOTPLUG_EVENT_PARTCHK); } static inline void dasd_destroy_partitions ( dasd_device_t * device ) { int i; int minor = MINOR(device->kdev); for (i = 0; i < (1 << DASD_PARTN_BITS); i++) { device->major_info->gendisk.part[minor+i].start_sect = 0; device->major_info->gendisk.part[minor+i].nr_sects = 0; } devfs_register_partitions(&device->major_info->gendisk, MINOR(device->kdev),1); dasd_do_hotplug_event (device, DASD_HOTPLUG_EVENT_PARTREMOVE); } /* * function dasd_set_device_level */ static int dasd_set_device_level (unsigned int devno, dasd_discipline_t * discipline, int to_state) { int rc = 0; dasd_device_t **device_addr; dasd_device_t *device; int from_state; device_addr = dasd_find_device_addr ( devno ); if ( device_addr == NULL ) { rc = -ENODEV; goto out; } device = *device_addr; if ( device == NULL ) { from_state = DASD_STATE_DEL; if ( to_state == DASD_STATE_DEL ) goto out; } else { from_state = device->level; } DBF_EVENT (DBF_INFO, "devno %04x; from %i to %i", devno, from_state, to_state); if ( from_state == to_state ) goto out; if ( to_state < from_state ) goto shutdown; /* First check for bringup */ if ( from_state <= DASD_STATE_DEL && to_state >= DASD_STATE_NEW ) { rc = dasd_state_del_to_new(device_addr, devno); if ( rc ) { goto bringup_fail; } device = *device_addr; } /* reprobe boxed devices */ if (device->level == DASD_STATE_BOXED) { rc = s390_trigger_resense (device->devinfo.irq); if ( rc ) { goto bringup_fail; } } if ( device->level <= DASD_STATE_BOXED && to_state >= DASD_STATE_KNOWN ) { rc = dasd_state_new_to_known( device_addr, devno, discipline ); if ( rc ) { goto bringup_fail; } } if ( device->level <= DASD_STATE_KNOWN && to_state >= DASD_STATE_ACCEPT ) { rc = dasd_state_known_to_accept(device); if ( rc ) { goto bringup_fail; } } if ( dasd_probeonly ) { goto out; } if ( device->level <= DASD_STATE_ACCEPT && to_state >= DASD_STATE_INIT ) { rc = dasd_state_accept_to_init(device); if ( rc ) { goto bringup_fail; } } if ( device->level <= DASD_STATE_INIT && to_state >= DASD_STATE_READY ) { rc = -EAGAIN; goto out; } if ( device->level <= DASD_STATE_READY && to_state >= DASD_STATE_ONLINE ) { rc = dasd_state_ready_to_online(device); if ( rc ) { goto bringup_fail; } } goto out; bringup_fail: /* revert changes */ DBF_DEV_EVENT (DBF_ERR, device, "failed to set device from state %d to %d at " "level %d rc %d. Reverting...", from_state, to_state, device->level, rc); if (device->level <= DASD_STATE_NEW) { /* Revert - device can not be accessed */ to_state = from_state; from_state = device->level; } /* now do a shutdown */ shutdown: if ( device->level >= DASD_STATE_ONLINE && to_state <= DASD_STATE_READY ) if (dasd_state_online_to_ready(device)) BUG(); if ( device->level >= DASD_STATE_READY && to_state <= DASD_STATE_ACCEPT ) if ( dasd_state_ready_to_accept(device)) BUG(); if ( device->level >= DASD_STATE_ACCEPT && to_state <= DASD_STATE_KNOWN ) if ( dasd_state_accept_to_known(device)) BUG(); if ( device->level >= DASD_STATE_KNOWN && to_state <= DASD_STATE_NEW ) if ( dasd_state_known_to_new(device)) BUG(); if ( device->level >= DASD_STATE_NEW && to_state <= DASD_STATE_DEL) if (dasd_state_new_to_del(device_addr, devno)) BUG(); goto out; out: return rc; } /******************************************************************************** * SECTION: Procfs stuff ********************************************************************************/ #ifdef CONFIG_PROC_FS typedef struct { char *data; int len; } tempinfo_t; void dasd_fill_inode (struct inode *inode, int fill) { if (fill) MOD_INC_USE_COUNT; else MOD_DEC_USE_COUNT; } static struct proc_dir_entry *dasd_proc_root_entry = NULL; static struct proc_dir_entry *dasd_devices_entry; static struct proc_dir_entry *dasd_statistics_entry; static int dasd_devices_open (struct inode *inode, struct file *file) { int rc = 0; int size = 1; int len = 0; major_info_t *temp = NULL; struct list_head *l; tempinfo_t *info; int i; unsigned long flags; int index = 0; MOD_INC_USE_COUNT; spin_lock_irqsave(&discipline_lock, flags); info = (tempinfo_t *) vmalloc (sizeof (tempinfo_t)); if (info == NULL) { MESSAGE (KERN_WARNING, "%s", "No memory available for data (tempinfo)"); spin_unlock_irqrestore(&discipline_lock, flags); MOD_DEC_USE_COUNT; return -ENOMEM; } else { file->private_data = (void *) info; } list_for_each (l, &dasd_major_info) { size += 128 * 1 << (MINORBITS - DASD_PARTN_BITS); } info->data = (char *) vmalloc (size); if (size && info->data == NULL) { MESSAGE (KERN_WARNING, "%s", "No memory available for data (info->data)"); vfree (info); spin_unlock_irqrestore(&discipline_lock, flags); MOD_DEC_USE_COUNT; return -ENOMEM; } DBF_EVENT (DBF_NOTICE, "procfs-area: %p, size 0x%x allocated", info->data, size); list_for_each (l, &dasd_major_info) { temp = list_entry (l, major_info_t, list); for (i = 0; i < 1 << (MINORBITS - DASD_PARTN_BITS); i++) { dasd_device_t *device; int devno = dasd_devno_from_devindex(index+i); int features; if ( devno == -ENODEV ) continue; features = dasd_features_from_devno(devno); if (features < DASD_FEATURE_DEFAULT) features = DASD_FEATURE_DEFAULT; device = temp->dasd_device[i]; if (device) { len += sprintf (info->data + len, "%04x(%s) at (%3d:%3d) is %-7s%4s: ", device->devinfo.devno, device->discipline ? device-> discipline->name : "none", temp->gendisk.major, i << DASD_PARTN_BITS, device->name, (features & DASD_FEATURE_READONLY) ? "(ro)" : " "); switch (device->level) { case DASD_STATE_NEW: len += sprintf (info->data + len, "new"); break; case DASD_STATE_KNOWN: len += sprintf (info->data + len, "detected"); break; case DASD_STATE_BOXED: len += sprintf (info->data + len, "boxed"); break; case DASD_STATE_ACCEPT: len += sprintf (info->data + len, "accepted"); break; case DASD_STATE_INIT: len += sprintf (info->data + len, "busy "); break; case DASD_STATE_READY: len += sprintf (info->data + len, "ready "); break; case DASD_STATE_ONLINE: len += sprintf (info->data + len, "active "); if (dasd_check_bp_block (device)) len += sprintf (info->data + len, "n/f "); else len += sprintf (info->data + len, "at blocksize: %d, %ld blocks, %ld MB", device->sizes.bp_block, device->sizes.blocks, ((device-> sizes.bp_block >> 9) * device->sizes. blocks) >> 11); break; default: len += sprintf (info->data + len, "no stat"); break; } } else { char buffer[7]; dasd_device_name (buffer, i, 0, &temp->gendisk); if ( devno < 0 ) { len += sprintf (info->data + len, "none"); } else { len += sprintf (info->data + len, "%04x",devno); } len += sprintf (info->data + len, "(none) at (%3d:%3d) is %-7s%4s: unknown", temp->gendisk.major, i << DASD_PARTN_BITS, buffer, (features & DASD_FEATURE_READONLY) ? "(ro)" : " "); } if ( dasd_probeonly ) len += sprintf(info->data + len,"(probeonly)"); len += sprintf(info->data + len,"\n"); } index += 1 << (MINORBITS - DASD_PARTN_BITS); } info->len = len; spin_unlock_irqrestore(&discipline_lock, flags); return rc; } #define MIN(a,b) ((a)<(b)?(a):(b)) static ssize_t dasd_generic_read (struct file *file, char *user_buf, size_t user_len, loff_t * offset) { loff_t len; tempinfo_t *p_info = (tempinfo_t *) file->private_data; if (*offset >= p_info->len) { return 0; /* EOF */ } else { len = MIN (user_len, (p_info->len - *offset)); if (copy_to_user (user_buf, &(p_info->data[*offset]), len)) return -EFAULT; (*offset) += len; return len; /* number of bytes "read" */ } } /* * scan for device range in given string (e.g. 0x0150-0x0155). * devnos are always hex and leading 0x are ignored. */ static char * dasd_parse_range (char *buffer, dasd_range_t *range) { char *str; /* remove optional 'device ' and 'range=' and search for nexet digit */ for (str = buffer + 4; isspace(*str); str++); if (strncmp (str, "device ", 7) == 0) for (str = str + 7; isspace(*str); str++); if (strncmp (str, "range=", 6) == 0) for (str = str + 6; isspace(*str); str++); range->to = range->from = dasd_strtoul (str, &str, &(range->features)); if (*str == '-') { str++; range->to = dasd_strtoul (str, &str, &(range->features)); } /* remove blanks after device range */ for (; isspace(*str); str++); if (range->from < 0 || range->to < 0) { MESSAGE_LOG (KERN_WARNING, "/proc/dasd/devices: range parse error in '%s'", buffer); return ERR_PTR (-EINVAL); } return str; } /* end dasd_parse_range */ /* * Enable / Disable the given devices */ static void dasd_proc_set (char *buffer) { dasd_range_t range; char *str; str = dasd_parse_range (buffer, &range); /* Negative numbers in str/from/to indicate errors */ if (IS_ERR (str) || (range.from < 0) || (range.to < 0) || (range.from > 0xFFFF) || (range.to > 0xFFFF)) return; if (strncmp (str, "on", 2) == 0) { dasd_enable_ranges (&range, NULL, 0); } else if (strncmp (str, "off", 3) == 0) { dasd_disable_ranges (&range, NULL, 0, 1); } else { MESSAGE_LOG (KERN_WARNING, "/proc/dasd/devices: " "only 'on' and 'off' are alowed in 'set' " "command ('%s'/'%s')", buffer, str); } return; } /* end dasd_proc_set */ /* * Add the given devices */ static void dasd_proc_add (char *buffer) { dasd_range_t range; char *str; str = dasd_parse_range (buffer, &range); /* Negative numbers in str/from/to indicate errors */ if (IS_ERR (str) || (range.from < 0) || (range.to < 0) || (range.from > 0xFFFF) || (range.to > 0xFFFF)) return; dasd_add_range (range.from, range.to, range.features); dasd_enable_ranges (&range, NULL, 0); return; } /* end dasd_proc_add */ /* * Break the lock of a given 'boxed' dasd. * If the dasd in not in status 'boxed' just return. */ static int dasd_break_boxed (dasd_range_t *range, dasd_device_t *device) { int rc = 0; dasd_discipline_t *discipline; struct list_head *lh = dasd_disc_head.next; /* check devixe status */ if (device->level != DASD_STATE_BOXED) { MESSAGE (KERN_WARNING, "/proc/dasd/devices: the given device (%04X) " "is not 'boxed')", device->devinfo.devno); rc = -EINVAL; goto out; } /* force eckd discipline */ do { discipline = list_entry(lh, dasd_discipline_t, list); if (strncmp (discipline->name, range->discipline, 4) == 0) break; /* discipline found */ lh = lh->next; /* check next discipline in list */ if (lh == &dasd_disc_head) { discipline = NULL; break; } } while ( 1 ); device->discipline = discipline; if (device->discipline == NULL) { MESSAGE (KERN_WARNING, "%s", "/proc/dasd/devices: discipline not found " "in discipline list"); rc = -EINVAL; goto out; } /* register the int handler to enable IO */ rc = s390_request_irq_special (device->devinfo.irq, device->discipline->int_handler, dasd_not_oper_handler, SA_DOPATHGROUP | SA_FORCE, DASD_NAME, &device->dev_status); if ( rc ) goto out; rc = dasd_steal_lock (device); /* unregister the int handler to enable re-sensing */ free_irq (device->devinfo.irq, &device->dev_status); device->discipline = NULL; device->level = DASD_STATE_NEW; out: return rc; } /* end dasd_break_boxed */ /* * Handle the procfs call 'brk <devno> <discipline>. */ static void dasd_proc_brk (char *buffer) { char *str; dasd_range_t range; dasd_device_t *device; int rc = 0; str = dasd_parse_range (buffer, &range); if (IS_ERR (str)) return; if (range.from != range.to) { MESSAGE (KERN_WARNING, "%s", "/proc/dasd/devices: 'brk <devno> <discipline> " "is only allowed for a single device (no ranges)"); return; } /* check for discipline = 'eckd' */ if (strncmp(str, "eckd", 4) != 0) { MESSAGE_LOG (KERN_WARNING, "/proc/dasd/devices: 'brk <devno> <discipline> " "is only allowed for 'eckd' (%s)", str); return; } memcpy (range.discipline, "ECKD", 4); device = *(dasd_device_from_devno (range.from)); if (device == NULL) { MESSAGE (KERN_WARNING, "/proc/dasd/devices: no device found for devno (%04X)", range.from); return; } rc = dasd_break_boxed (&range, device); if (rc == 0) { /* trigger CIO to resense the device */ s390_trigger_resense (device->devinfo.irq); // get the device online now dasd_enable_ranges (&range, NULL, 0); } } /* end dasd_proc_brk */ static ssize_t dasd_devices_write (struct file *file, const char *user_buf, size_t user_len, loff_t * offset) { char *buffer; if (user_len > PAGE_SIZE) return -EINVAL; buffer = vmalloc (user_len+1); if (buffer == NULL) return -ENOMEM; if (copy_from_user (buffer, user_buf, user_len)) { vfree (buffer); return -EFAULT; } /* replace LF with '\0' */ if (buffer[user_len -1] == '\n') { buffer[user_len -1] = '\0'; } else { buffer[user_len] = '\0'; } MESSAGE_LOG (KERN_INFO, "/proc/dasd/devices: '%s'", buffer); if (strncmp (buffer, "set ", 4) == 0) { /* handle 'set <devno> on/off' */ dasd_proc_set (buffer); } else if (strncmp (buffer, "add ", 4) == 0) { /* handle 'add <devno>' */ dasd_proc_add (buffer); } else if (strncmp (buffer, "brk ", 4) == 0) { /* handle 'brk <devno> <discipline>' */ dasd_proc_brk (buffer); } else { MESSAGE (KERN_WARNING, "%s", "/proc/dasd/devices: only 'set' ,'add' and " "'brk' are supported verbs"); vfree (buffer); return -EINVAL; } vfree (buffer); return user_len; } static int dasd_devices_close (struct inode *inode, struct file *file) { int rc = 0; tempinfo_t *p_info = (tempinfo_t *) file->private_data; if (p_info) { if (p_info->data) vfree (p_info->data); vfree (p_info); } MOD_DEC_USE_COUNT; return rc; } static struct file_operations dasd_devices_file_ops = { read:dasd_generic_read, /* read */ write:dasd_devices_write, /* write */ open:dasd_devices_open, /* open */ release:dasd_devices_close, /* close */ }; static struct inode_operations dasd_devices_inode_ops = { }; static int dasd_statistics_open (struct inode *inode, struct file *file) { int rc = 0; int len = 0; tempinfo_t *info; int shift, i, help = 0; MOD_INC_USE_COUNT; info = (tempinfo_t *) vmalloc (sizeof (tempinfo_t)); if (info == NULL) { MESSAGE (KERN_WARNING, "%s", "No memory available for data (tempinfo)"); MOD_DEC_USE_COUNT; return -ENOMEM; } else { file->private_data = (void *) info; } /* FIXME! determine space needed in a better way */ info->data = (char *) vmalloc (PAGE_SIZE); if (info->data == NULL) { MESSAGE (KERN_WARNING, "%s", "No memory available for data (info->data)"); vfree (info); file->private_data = NULL; MOD_DEC_USE_COUNT; return -ENOMEM; } /* check for active profiling */ if (dasd_profile_level == DASD_PROFILE_OFF) { info->len = sprintf (info->data, "Statistics are off - they might be " "switched on using 'echo set on > " "/proc/dasd/statistics'\n"); return rc; } /* prevent couter 'ouverflow' on output */ for (shift = 0, help = dasd_global_profile.dasd_io_reqs; help > 9999999; help = help >> 1, shift++) ; len = sprintf (info->data, "%d dasd I/O requests\n", dasd_global_profile.dasd_io_reqs); len += sprintf (info->data + len, "with %d sectors(512B each)\n", dasd_global_profile.dasd_io_sects); len += sprintf (info->data + len, " __<4 ___8 __16 __32 __64 " " _128 _256 _512 __1k __2k " " __4k __8k _16k _32k _64k " " 128k\n"); len += sprintf (info->data + len, " _256 _512 __1M __2M __4M " " __8M _16M _32M _64M 128M " " 256M 512M __1G __2G __4G " " _>4G\n"); len += sprintf (info->data + len, "Histogram of sizes (512B secs)\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_secs[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_secs[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "Histogram of I/O times (microseconds)\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_times[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_times[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "Histogram of I/O times per sector\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_timps[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_timps[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "Histogram of I/O time till ssch\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time1[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time1[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "Histogram of I/O time between ssch and irq\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time2[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time2[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "Histogram of I/O time between ssch and irq per " "sector\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time2ps[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time2ps[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "Histogram of I/O time between irq and end\n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time3[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_time3[i] >> shift); } len += sprintf (info->data + len, "\n"); len += sprintf (info->data + len, "# of req in chanq at enqueuing (1..32) \n"); for (i = 0; i < 16; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_nr_req[i] >> shift); } len += sprintf (info->data + len, "\n"); for (; i < 32; i++) { len += sprintf (info->data + len, "%7d ", dasd_global_profile.dasd_io_nr_req[i] >> shift); } len += sprintf (info->data + len, "\n"); info->len = len; return rc; } static ssize_t dasd_statistics_write (struct file *file, const char *user_buf, size_t user_len, loff_t * offset) { char *buffer; if(user_len > 65536) user_len = 65536; buffer = vmalloc (user_len); if (buffer == NULL) return -ENOMEM; if (copy_from_user (buffer, user_buf, user_len)) { vfree (buffer); return -EFAULT; } buffer[user_len] = 0; MESSAGE (KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); #ifdef DASD_PROFILE /* check for valid verbs */ if (strncmp (buffer, "reset", 5) && strncmp (buffer, "set ", 4) ) { MESSAGE (KERN_WARNING, "%s", "/proc/dasd/statistics: only 'set' and " "'reset' are supported verbs"); return -EINVAL; } if (!strncmp (buffer, "reset", 5)) { /* reset the statistics */ memset (&dasd_global_profile, 0, sizeof (dasd_profile_info_t)); MESSAGE (KERN_INFO, "%s", "Statictics reset"); } else { /* 'set xxx' was given */ int offset = 4; while (buffer[offset] && !isalnum (buffer[offset])) offset++; if (!strncmp (buffer + offset, "on", 2)) { /* switch on statistics profiling */ dasd_profile_level = DASD_PROFILE_ON; MESSAGE (KERN_INFO, "%s", "Statictics switched on"); } else if (!strncmp (buffer + offset, "off", 3)) { /* switch off and reset statistics profiling */ memset (&dasd_global_profile, 0, sizeof (dasd_profile_info_t)); dasd_profile_level = DASD_PROFILE_OFF; MESSAGE (KERN_INFO, "%s", "Statictics switched off"); } else { MESSAGE (KERN_WARNING, "%s", "/proc/dasd/statistics: only 'set on' and " "'set off' are supported verbs"); } } #else MESSAGE (KERN_WARNING, "%s", "/proc/dasd/statistics: is not activated in this " "kernel"); #endif /* DASD_PROFILE */ return user_len; } static struct file_operations dasd_statistics_file_ops = { read:dasd_generic_read, /* read */ write:dasd_statistics_write, /* write */ open:dasd_statistics_open, /* open */ release:dasd_devices_close, /* close */ }; static struct inode_operations dasd_statistics_inode_ops = { }; int dasd_proc_init (void) { int rc = 0; dasd_proc_root_entry = proc_mkdir ("dasd", &proc_root); dasd_devices_entry = create_proc_entry ("devices", S_IFREG | S_IRUGO | S_IWUSR, dasd_proc_root_entry); dasd_devices_entry->proc_fops = &dasd_devices_file_ops; dasd_devices_entry->proc_iops = &dasd_devices_inode_ops; dasd_statistics_entry = create_proc_entry ("statistics", S_IFREG | S_IRUGO | S_IWUSR, dasd_proc_root_entry); dasd_statistics_entry->proc_fops = &dasd_statistics_file_ops; dasd_statistics_entry->proc_iops = &dasd_statistics_inode_ops; return rc; } void dasd_proc_cleanup (void) { remove_proc_entry ("devices", dasd_proc_root_entry); remove_proc_entry ("statistics", dasd_proc_root_entry); remove_proc_entry ("dasd", &proc_root); } #endif /* CONFIG_PROC_FS */ /******************************************************************************** * SECTION: Initializing the driver ********************************************************************************/ int dasd_request_module ( void *name ) { int rc = -ERESTARTSYS; strcpy(current->comm, name); daemonize(); while ( current->fs->root == NULL ) { /* wait for root-FS */ DECLARE_WAIT_QUEUE_HEAD(wait); sleep_on_timeout(&wait,HZ); /* wait in steps of one second */ } while ( (rc=request_module(name)) != 0 ) { DECLARE_WAIT_QUEUE_HEAD(wait); MESSAGE_LOG (KERN_INFO, "request_module returned %d for %s", rc, (char*)name); sleep_on_timeout(&wait,5* HZ); /* wait in steps of 5 seconds */ } return rc; } int __init dasd_init (void) { int rc = 0; int irq; major_info_t *major_info = NULL; struct list_head *l; MESSAGE (KERN_INFO, "%s", "initializing..."); init_waitqueue_head (&dasd_init_waitq); /* register 'common' DASD debug area, used faor all DBF_XXX calls*/ dasd_debug_area = debug_register (DASD_NAME, 0, /* size of debug area */ 2, /* number of areas */ 8 * sizeof (long)); debug_register_view (dasd_debug_area, &debug_sprintf_view); if (dasd_debug_area == NULL) { goto failed; } debug_set_level (dasd_debug_area, DBF_ERR); DBF_EVENT (DBF_EMERG, "%s", "debug area created"); dasd_devfs_handle = devfs_mk_dir (NULL, DASD_NAME, NULL); if (dasd_devfs_handle < 0) { DBF_EVENT (DBF_ALERT, "%s", "no devfs"); goto failed; } list_add_tail(&dasd_major_static.list, &dasd_major_info); list_for_each (l, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); if ((rc = dasd_register_major (major_info)) > 0) { MESSAGE (KERN_INFO, "Registered successfully to major no %u", major_info->gendisk.major); } else { MESSAGE (KERN_WARNING, "Couldn't register successfully to " "major no %d", major_info->gendisk.major); /* revert registration of major infos */ goto failed; } } #ifndef MODULE dasd_split_parm_string (dasd_parm_string); #endif /* ! MODULE */ rc = dasd_parse (dasd); if (rc) { DBF_EVENT (DBF_ALERT, "%s", "invalid range found"); goto failed; } #ifdef CONFIG_PROC_FS rc = dasd_proc_init (); if (rc) { DBF_EVENT (DBF_ALERT, "%s", "no proc-FS"); goto failed; } #endif /* CONFIG_PROC_FS */ genhd_dasd_name = dasd_device_name; genhd_dasd_ioctl = dasd_ioctl; if (dasd_autodetect) { /* update device range to all devices */ for (irq = get_irq_first (); irq != -ENODEV; irq = get_irq_next (irq)) { int devno = get_devno_by_irq (irq); int index = dasd_devindex_from_devno (devno); if (index < 0) { /* not included in ranges */ DBF_EVENT (DBF_CRIT, "add %04x to range", devno); dasd_add_range (devno, devno, DASD_FEATURE_DEFAULT); } } } if (MACHINE_IS_VM) { #ifdef CONFIG_DASD_DIAG rc = dasd_diag_init (); if (rc == 0) { MESSAGE (KERN_INFO, "%s", "Registered DIAG discipline successfully"); } else { DBF_EVENT (DBF_ALERT, "%s", "Register DIAG discipline failed"); goto failed; } #endif /* CONFIG_DASD_DIAG */ #if defined(CONFIG_DASD_DIAG_MODULE) && defined(CONFIG_DASD_AUTO_DIAG) kernel_thread(dasd_request_module,"dasd_diag_mod",SIGCHLD); #endif /* CONFIG_DASD_AUTO_DIAG */ } #ifdef CONFIG_DASD_ECKD rc = dasd_eckd_init (); if (rc == 0) { MESSAGE (KERN_INFO, "%s", "Registered ECKD discipline successfully"); } else { DBF_EVENT (DBF_ALERT, "%s", "Register ECKD discipline failed"); goto failed; } #endif /* CONFIG_DASD_ECKD */ #if defined(CONFIG_DASD_ECKD_MODULE) && defined(CONFIG_DASD_AUTO_ECKD) kernel_thread(dasd_request_module,"dasd_eckd_mod",SIGCHLD); #endif /* CONFIG_DASD_AUTO_ECKD */ #ifdef CONFIG_DASD_FBA rc = dasd_fba_init (); if (rc == 0) { MESSAGE (KERN_INFO, "%s", "Registered FBA discipline successfully"); } else { DBF_EVENT (DBF_ALERT, "%s", "Register FBA discipline failed"); goto failed; } #endif /* CONFIG_DASD_FBA */ #if defined(CONFIG_DASD_FBA_MODULE) && defined(CONFIG_DASD_AUTO_FBA) kernel_thread(dasd_request_module,"dasd_fba_mod",SIGCHLD); #endif /* CONFIG_DASD_AUTO_FBA */ { char **disc=dasd_disciplines; while (*disc) { kernel_thread(dasd_request_module,*disc,SIGCHLD); disc++; } } rc = 0; goto out; failed: MESSAGE (KERN_INFO, "%s", "initialization not performed due to errors"); cleanup_dasd (); out: MESSAGE (KERN_INFO, "%s", "initialization finished"); return rc; } static void cleanup_dasd (void) { int i,rc=0; major_info_t *major_info = NULL; struct list_head *l,*n; dasd_range_t *range; MESSAGE (KERN_INFO, "%s", "shutting down"); dasd_disable_ranges (&dasd_range_head, NULL, 1, 1); #ifdef CONFIG_DASD_DIAG if (MACHINE_IS_VM) { dasd_diag_cleanup (); MESSAGE (KERN_INFO, "%s", "De-Registered DIAG discipline successfully"); } #endif /* CONFIG_DASD_DIAG */ #ifdef CONFIG_DASD_FBA dasd_fba_cleanup (); MESSAGE (KERN_INFO, "%s", "De-Registered FBA discipline successfully"); #endif /* CONFIG_DASD_FBA */ #ifdef CONFIG_DASD_ECKD dasd_eckd_cleanup (); MESSAGE (KERN_INFO, "%s", "De-Registered ECKD discipline successfully"); #endif /* CONFIG_DASD_ECKD */ genhd_dasd_name = NULL; genhd_dasd_ioctl = NULL; #ifdef CONFIG_PROC_FS dasd_proc_cleanup (); #endif /* CONFIG_PROC_FS */ list_for_each_safe (l, n, &dasd_major_info) { major_info = list_entry (l, major_info_t, list); for (i = 0; i < DASD_PER_MAJOR; i++) { kfree (major_info->dasd_device[i]); } if ((major_info->flags & DASD_MAJOR_INFO_REGISTERED) && (rc = dasd_unregister_major (major_info)) == 0) { MESSAGE (KERN_INFO, "Unregistered successfully from major no %u", major_info->gendisk.major); } else { MESSAGE (KERN_WARNING, "Couldn't unregister successfully from major " "no %d rc = %d", major_info->gendisk.major, rc); } } list_for_each_safe (l, n, &dasd_range_head.list) { range = list_entry (l, dasd_range_t, list); dasd_remove_range(range); } #ifndef MODULE for( i = 0; i < 256; i++ ) if ( dasd[i] ) { kfree(dasd[i]); dasd[i] = NULL; } #endif /* MODULE */ if (dasd_devfs_handle) devfs_unregister(dasd_devfs_handle); if (dasd_debug_area != NULL ) { debug_unregister(dasd_debug_area); dasd_debug_area = NULL; } MESSAGE (KERN_INFO, "%s", "shutdown completed"); } #ifdef MODULE int init_module (void) { int rc = 0; rc = dasd_init (); return rc; } void cleanup_module (void) { cleanup_dasd (); return; } #endif /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-indent-level: 4 * c-brace-imaginary-offset: 0 * c-brace-offset: -4 * c-argdecl-indent: 4 * c-label-offset: -4 * c-continued-statement-offset: 4 * c-continued-brace-offset: 0 * indent-tabs-mode: nil * tab-width: 8 * End: */
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