/* * Author(s)......: Holger Smolinski * Horst Hummel * Carsten Otte * Martin Schwidefsky * Bugreports.to..: * Copyright IBM Corp. 1999,2001 * * Device mapping and dasd= parameter parsing functions. All devmap * functions may not be called from interrupt context. In particular * dasd_get_device is a no-no from interrupt context. * */ #define KMSG_COMPONENT "dasd" #include #include #include #include #include #include #include /* This is ugly... */ #define PRINTK_HEADER "dasd_devmap:" #define DASD_BUS_ID_SIZE 20 #define DASD_MAX_PARAMS 256 #include "dasd_int.h" struct kmem_cache *dasd_page_cache; EXPORT_SYMBOL_GPL(dasd_page_cache); /* * dasd_devmap_t is used to store the features and the relation * between device number and device index. To find a dasd_devmap_t * that corresponds to a device number of a device index each * dasd_devmap_t is added to two linked lists, one to search by * the device number and one to search by the device index. As * soon as big minor numbers are available the device index list * can be removed since the device number will then be identical * to the device index. */ struct dasd_devmap { struct list_head list; char bus_id[DASD_BUS_ID_SIZE]; unsigned int devindex; unsigned short features; struct dasd_device *device; }; /* * Parameter parsing functions for dasd= parameter. The syntax is: * : (0x)?[0-9a-fA-F]+ * : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ * : ro * : \((:)*\) * : (-)?? * : (-)?? * : | * : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod * * : autodetect|probeonly|(,)* */ int dasd_probeonly = 0; /* is true, when probeonly mode is active */ int dasd_autodetect = 0; /* is true, when autodetection is active */ int dasd_nopav = 0; /* is true, when PAV is disabled */ EXPORT_SYMBOL_GPL(dasd_nopav); int dasd_nofcx; /* disable High Performance Ficon */ EXPORT_SYMBOL_GPL(dasd_nofcx); /* * 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. */ static char *dasd[DASD_MAX_PARAMS]; module_param_array(dasd, charp, NULL, S_IRUGO); /* * Single spinlock to protect devmap and servermap structures and lists. */ static DEFINE_SPINLOCK(dasd_devmap_lock); /* * Hash lists for devmap structures. */ static struct list_head dasd_hashlists[256]; int dasd_max_devindex; static struct dasd_devmap *dasd_add_busid(const char *, int); static inline int dasd_hash_busid(const char *bus_id) { int hash, i; hash = 0; for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++) hash += *bus_id; return hash & 0xff; } #ifndef MODULE static int __init dasd_call_setup(char *opt) { static int i __initdata; char *tmp; while (i < DASD_MAX_PARAMS) { tmp = strsep(&opt, ","); if (!tmp) break; dasd[i++] = tmp; } return 1; } __setup ("dasd=", dasd_call_setup); #endif /* #ifndef MODULE */ #define DASD_IPLDEV "ipldev" /* * Read a device busid/devno from a string. */ static int __init dasd_busid(char *str, int *id0, int *id1, int *devno) { unsigned int val; char *tok; /* Interpret ipldev busid */ if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) { if (ipl_info.type != IPL_TYPE_CCW) { pr_err("The IPL device is not a CCW device\n"); return -EINVAL; } *id0 = 0; *id1 = ipl_info.data.ccw.dev_id.ssid; *devno = ipl_info.data.ccw.dev_id.devno; return 0; } /* Old style 0xXXXX or XXXX */ if (!kstrtouint(str, 16, &val)) { *id0 = *id1 = 0; if (val < 0 || val > 0xffff) return -EINVAL; *devno = val; return 0; } /* New style x.y.z busid */ tok = strsep(&str, "."); if (kstrtouint(tok, 16, &val) || val > 0xff) return -EINVAL; *id0 = val; tok = strsep(&str, "."); if (kstrtouint(tok, 16, &val) || val > 0xff) return -EINVAL; *id1 = val; tok = strsep(&str, "."); if (kstrtouint(tok, 16, &val) || val > 0xffff) return -EINVAL; *devno = val; return 0; } /* * Read colon separated list of dasd features. */ static int __init dasd_feature_list(char *str) { int features, len, rc; features = 0; rc = 0; if (!str) return DASD_FEATURE_DEFAULT; while (1) { for (len = 0; str[len] && str[len] != ':' && str[len] != ')'; len++); if (len == 2 && !strncmp(str, "ro", 2)) features |= DASD_FEATURE_READONLY; else if (len == 4 && !strncmp(str, "diag", 4)) features |= DASD_FEATURE_USEDIAG; else if (len == 3 && !strncmp(str, "raw", 3)) features |= DASD_FEATURE_USERAW; else if (len == 6 && !strncmp(str, "erplog", 6)) features |= DASD_FEATURE_ERPLOG; else if (len == 8 && !strncmp(str, "failfast", 8)) features |= DASD_FEATURE_FAILFAST; else { pr_warn("%*s is not a supported device option\n", len, str); rc = -EINVAL; } str += len; if (*str != ':') break; str++; } return rc ? : features; } /* * Try to match the first element on the comma separated parse string * with one of the known keywords. If a keyword is found, take the approprate * action and return a pointer to the residual string. If the first element * could not be matched to any keyword then return an error code. */ static int __init dasd_parse_keyword(char *keyword) { int length = strlen(keyword); if (strncmp("autodetect", keyword, length) == 0) { dasd_autodetect = 1; pr_info("The autodetection mode has been activated\n"); return 0; } if (strncmp("probeonly", keyword, length) == 0) { dasd_probeonly = 1; pr_info("The probeonly mode has been activated\n"); return 0; } if (strncmp("nopav", keyword, length) == 0) { if (MACHINE_IS_VM) pr_info("'nopav' is not supported on z/VM\n"); else { dasd_nopav = 1; pr_info("PAV support has be deactivated\n"); } return 0; } if (strncmp("nofcx", keyword, length) == 0) { dasd_nofcx = 1; pr_info("High Performance FICON support has been " "deactivated\n"); return 0; } if (strncmp("fixedbuffers", keyword, length) == 0) { if (dasd_page_cache) return 0; dasd_page_cache = kmem_cache_create("dasd_page_cache", PAGE_SIZE, PAGE_SIZE, SLAB_CACHE_DMA, NULL); if (!dasd_page_cache) DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, " "fixed buffer mode disabled."); else DBF_EVENT(DBF_INFO, "%s", "turning on fixed buffer mode"); return 0; } return -EINVAL; } /* * Split a string of a device range into its pieces and return the from, to, and * feature parts separately. * e.g.: * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw * 0x4321 -> from: 0x4321 to: null features: null */ static int __init dasd_evaluate_range_param(char *range, char **from_str, char **to_str, char **features_str) { int rc = 0; /* Do we have a range or a single device? */ if (strchr(range, '-')) { *from_str = strsep(&range, "-"); *to_str = strsep(&range, "("); *features_str = strsep(&range, ")"); } else { *from_str = strsep(&range, "("); *features_str = strsep(&range, ")"); } if (*features_str && !range) { pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n"); rc = -EINVAL; } return rc; } /* * Try to interprete the range string as a device number or a range of devices. * If the interpretation is successful, create the matching dasd_devmap entries. * If interpretation fails or in case of an error, return an error code. */ static int __init dasd_parse_range(const char *range) { struct dasd_devmap *devmap; int from, from_id0, from_id1; int to, to_id0, to_id1; int features; char bus_id[DASD_BUS_ID_SIZE + 1]; char *features_str = NULL; char *from_str = NULL; char *to_str = NULL; size_t len = strlen(range) + 1; char tmp[len]; strlcpy(tmp, range, len); if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) goto out_err; if (dasd_busid(from_str, &from_id0, &from_id1, &from)) goto out_err; to = from; to_id0 = from_id0; to_id1 = from_id1; if (to_str) { if (dasd_busid(to_str, &to_id0, &to_id1, &to)) goto out_err; if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) { pr_err("%s is not a valid device range\n", range); goto out_err; } } features = dasd_feature_list(features_str); if (features < 0) goto out_err; /* each device in dasd= parameter should be set initially online */ features |= DASD_FEATURE_INITIAL_ONLINE; while (from <= to) { sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++); devmap = dasd_add_busid(bus_id, features); if (IS_ERR(devmap)) return PTR_ERR(devmap); } return 0; out_err: return -EINVAL; } /* * Parse parameters stored in dasd[] * The 'dasd=...' parameter allows to specify a comma separated list of * keywords and device ranges. The parameters in that list will be stored as * separate elementes in dasd[]. */ int __init dasd_parse(void) { int rc, i; char *cur; rc = 0; for (i = 0; i < DASD_MAX_PARAMS; i++) { cur = dasd[i]; if (!cur) break; if (*cur == '\0') continue; rc = dasd_parse_keyword(cur); if (rc) rc = dasd_parse_range(cur); if (rc) break; } return rc; } /* * Add a devmap for the device specified by busid. It is possible that * the devmap already exists (dasd= parameter). The order of the devices * added through this function will define the kdevs for the individual * devices. */ static struct dasd_devmap * dasd_add_busid(const char *bus_id, int features) { struct dasd_devmap *devmap, *new, *tmp; int hash; new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); if (!new) return ERR_PTR(-ENOMEM); spin_lock(&dasd_devmap_lock); devmap = NULL; hash = dasd_hash_busid(bus_id); list_for_each_entry(tmp, &dasd_hashlists[hash], list) if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { devmap = tmp; break; } if (!devmap) { /* This bus_id is new. */ new->devindex = dasd_max_devindex++; strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); new->features = features; new->device = NULL; list_add(&new->list, &dasd_hashlists[hash]); devmap = new; new = NULL; } spin_unlock(&dasd_devmap_lock); kfree(new); return devmap; } /* * Find devmap for device with given bus_id. */ static struct dasd_devmap * dasd_find_busid(const char *bus_id) { struct dasd_devmap *devmap, *tmp; int hash; spin_lock(&dasd_devmap_lock); devmap = ERR_PTR(-ENODEV); hash = dasd_hash_busid(bus_id); list_for_each_entry(tmp, &dasd_hashlists[hash], list) { if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { devmap = tmp; break; } } spin_unlock(&dasd_devmap_lock); return devmap; } /* * Check if busid has been added to the list of dasd ranges. */ int dasd_busid_known(const char *bus_id) { return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; } /* * Forget all about the device numbers added so far. * This may only be called at module unload or system shutdown. */ static void dasd_forget_ranges(void) { struct dasd_devmap *devmap, *n; int i; spin_lock(&dasd_devmap_lock); for (i = 0; i < 256; i++) { list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { BUG_ON(devmap->device != NULL); list_del(&devmap->list); kfree(devmap); } } spin_unlock(&dasd_devmap_lock); } /* * Find the device struct by its device index. */ struct dasd_device * dasd_device_from_devindex(int devindex) { struct dasd_devmap *devmap, *tmp; struct dasd_device *device; int i; spin_lock(&dasd_devmap_lock); devmap = NULL; for (i = 0; (i < 256) && !devmap; i++) list_for_each_entry(tmp, &dasd_hashlists[i], list) if (tmp->devindex == devindex) { /* Found the devmap for the device. */ devmap = tmp; break; } if (devmap && devmap->device) { device = devmap->device; dasd_get_device(device); } else device = ERR_PTR(-ENODEV); spin_unlock(&dasd_devmap_lock); return device; } /* * Return devmap for cdev. If no devmap exists yet, create one and * connect it to the cdev. */ static struct dasd_devmap * dasd_devmap_from_cdev(struct ccw_device *cdev) { struct dasd_devmap *devmap; devmap = dasd_find_busid(dev_name(&cdev->dev)); if (IS_ERR(devmap)) devmap = dasd_add_busid(dev_name(&cdev->dev), DASD_FEATURE_DEFAULT); return devmap; } /* * Create a dasd device structure for cdev. */ struct dasd_device * dasd_create_device(struct ccw_device *cdev) { struct dasd_devmap *devmap; struct dasd_device *device; unsigned long flags; int rc; devmap = dasd_devmap_from_cdev(cdev); if (IS_ERR(devmap)) return (void *) devmap; device = dasd_alloc_device(); if (IS_ERR(device)) return device; atomic_set(&device->ref_count, 3); spin_lock(&dasd_devmap_lock); if (!devmap->device) { devmap->device = device; device->devindex = devmap->devindex; device->features = devmap->features; get_device(&cdev->dev); device->cdev = cdev; rc = 0; } else /* Someone else was faster. */ rc = -EBUSY; spin_unlock(&dasd_devmap_lock); if (rc) { dasd_free_device(device); return ERR_PTR(rc); } spin_lock_irqsave(get_ccwdev_lock(cdev), flags); dev_set_drvdata(&cdev->dev, device); spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); return device; } /* * Wait queue for dasd_delete_device waits. */ static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); /* * Remove a dasd device structure. The passed referenced * is destroyed. */ void dasd_delete_device(struct dasd_device *device) { struct ccw_device *cdev; struct dasd_devmap *devmap; unsigned long flags; /* First remove device pointer from devmap. */ devmap = dasd_find_busid(dev_name(&device->cdev->dev)); BUG_ON(IS_ERR(devmap)); spin_lock(&dasd_devmap_lock); if (devmap->device != device) { spin_unlock(&dasd_devmap_lock); dasd_put_device(device); return; } devmap->device = NULL; spin_unlock(&dasd_devmap_lock); /* Disconnect dasd_device structure from ccw_device structure. */ spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); dev_set_drvdata(&device->cdev->dev, NULL); spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); /* * Drop ref_count by 3, one for the devmap reference, one for * the cdev reference and one for the passed reference. */ atomic_sub(3, &device->ref_count); /* Wait for reference counter to drop to zero. */ wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); dasd_generic_free_discipline(device); /* Disconnect dasd_device structure from ccw_device structure. */ cdev = device->cdev; device->cdev = NULL; /* Put ccw_device structure. */ put_device(&cdev->dev); /* Now the device structure can be freed. */ dasd_free_device(device); } /* * Reference counter dropped to zero. Wake up waiter * in dasd_delete_device. */ void dasd_put_device_wake(struct dasd_device *device) { wake_up(&dasd_delete_wq); } EXPORT_SYMBOL_GPL(dasd_put_device_wake); /* * Return dasd_device structure associated with cdev. * This function needs to be called with the ccw device * lock held. It can be used from interrupt context. */ struct dasd_device * dasd_device_from_cdev_locked(struct ccw_device *cdev) { struct dasd_device *device = dev_get_drvdata(&cdev->dev); if (!device) return ERR_PTR(-ENODEV); dasd_get_device(device); return device; } /* * Return dasd_device structure associated with cdev. */ struct dasd_device * dasd_device_from_cdev(struct ccw_device *cdev) { struct dasd_device *device; unsigned long flags; spin_lock_irqsave(get_ccwdev_lock(cdev), flags); device = dasd_device_from_cdev_locked(cdev); spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); return device; } void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) { struct dasd_devmap *devmap; devmap = dasd_find_busid(dev_name(&device->cdev->dev)); if (IS_ERR(devmap)) return; spin_lock(&dasd_devmap_lock); gdp->private_data = devmap; spin_unlock(&dasd_devmap_lock); } struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) { struct dasd_device *device; struct dasd_devmap *devmap; if (!gdp->private_data) return NULL; device = NULL; spin_lock(&dasd_devmap_lock); devmap = gdp->private_data; if (devmap && devmap->device) { device = devmap->device; dasd_get_device(device); } spin_unlock(&dasd_devmap_lock); return device; } /* * SECTION: files in sysfs */ /* * failfast controls the behaviour, if no path is available */ static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int ff_flag; devmap = dasd_find_busid(dev_name(dev)); if (!IS_ERR(devmap)) ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; else ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n"); } static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { unsigned int val; int rc; if (kstrtouint(buf, 0, &val) || val > 1) return -EINVAL; rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val); return rc ? : count; } static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); /* * readonly controls the readonly status of a dasd */ static ssize_t dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int ro_flag; devmap = dasd_find_busid(dev_name(dev)); if (!IS_ERR(devmap)) ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; else ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); } static ssize_t dasd_ro_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ccw_device *cdev = to_ccwdev(dev); struct dasd_device *device; unsigned long flags; unsigned int val; int rc; if (kstrtouint(buf, 0, &val) || val > 1) return -EINVAL; rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val); if (rc) return rc; device = dasd_device_from_cdev(cdev); if (IS_ERR(device)) return PTR_ERR(device); spin_lock_irqsave(get_ccwdev_lock(cdev), flags); val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); if (!device->block || !device->block->gdp || test_bit(DASD_FLAG_OFFLINE, &device->flags)) { spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); goto out; } /* Increase open_count to avoid losing the block device */ atomic_inc(&device->block->open_count); spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); set_disk_ro(device->block->gdp, val); atomic_dec(&device->block->open_count); out: dasd_put_device(device); return count; } static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); /* * erplog controls the logging of ERP related data * (e.g. failing channel programs). */ static ssize_t dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int erplog; devmap = dasd_find_busid(dev_name(dev)); if (!IS_ERR(devmap)) erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; else erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); } static ssize_t dasd_erplog_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { unsigned int val; int rc; if (kstrtouint(buf, 0, &val) || val > 1) return -EINVAL; rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val); return rc ? : count; } static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); /* * use_diag controls whether the driver should use diag rather than ssch * to talk to the device */ static ssize_t dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int use_diag; devmap = dasd_find_busid(dev_name(dev)); if (!IS_ERR(devmap)) use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; else use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; return sprintf(buf, use_diag ? "1\n" : "0\n"); } static ssize_t dasd_use_diag_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_devmap *devmap; unsigned int val; ssize_t rc; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); if (kstrtouint(buf, 0, &val) || val > 1) return -EINVAL; spin_lock(&dasd_devmap_lock); /* Changing diag discipline flag is only allowed in offline state. */ rc = count; if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) { if (val) devmap->features |= DASD_FEATURE_USEDIAG; else devmap->features &= ~DASD_FEATURE_USEDIAG; } else rc = -EPERM; spin_unlock(&dasd_devmap_lock); return rc; } static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); /* * use_raw controls whether the driver should give access to raw eckd data or * operate in standard mode */ static ssize_t dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int use_raw; devmap = dasd_find_busid(dev_name(dev)); if (!IS_ERR(devmap)) use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0; else use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0; return sprintf(buf, use_raw ? "1\n" : "0\n"); } static ssize_t dasd_use_raw_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_devmap *devmap; ssize_t rc; unsigned long val; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); if ((kstrtoul(buf, 10, &val) != 0) || val > 1) return -EINVAL; spin_lock(&dasd_devmap_lock); /* Changing diag discipline flag is only allowed in offline state. */ rc = count; if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) { if (val) devmap->features |= DASD_FEATURE_USERAW; else devmap->features &= ~DASD_FEATURE_USERAW; } else rc = -EPERM; spin_unlock(&dasd_devmap_lock); return rc; } static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show, dasd_use_raw_store); static ssize_t dasd_safe_offline_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ccw_device *cdev = to_ccwdev(dev); struct dasd_device *device; int rc; device = dasd_device_from_cdev(cdev); if (IS_ERR(device)) { rc = PTR_ERR(device); goto out; } if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { /* Already doing offline processing */ dasd_put_device(device); rc = -EBUSY; goto out; } set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); dasd_put_device(device); rc = ccw_device_set_offline(cdev); out: return rc ? rc : count; } static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store); static ssize_t dasd_access_show(struct device *dev, struct device_attribute *attr, char *buf) { struct ccw_device *cdev = to_ccwdev(dev); struct dasd_device *device; int count; device = dasd_device_from_cdev(cdev); if (IS_ERR(device)) return PTR_ERR(device); if (!device->discipline) count = -ENODEV; else if (!device->discipline->host_access_count) count = -EOPNOTSUPP; else count = device->discipline->host_access_count(device); dasd_put_device(device); if (count < 0) return count; return sprintf(buf, "%d\n", count); } static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL); static ssize_t dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; ssize_t len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) goto out; else if (!device->discipline) { dasd_put_device(device); goto out; } else { len = snprintf(buf, PAGE_SIZE, "%s\n", device->discipline->name); dasd_put_device(device); return len; } out: len = snprintf(buf, PAGE_SIZE, "none\n"); return len; } static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); static ssize_t dasd_device_status_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; ssize_t len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (!IS_ERR(device)) { switch (device->state) { case DASD_STATE_NEW: len = snprintf(buf, PAGE_SIZE, "new\n"); break; case DASD_STATE_KNOWN: len = snprintf(buf, PAGE_SIZE, "detected\n"); break; case DASD_STATE_BASIC: len = snprintf(buf, PAGE_SIZE, "basic\n"); break; case DASD_STATE_UNFMT: len = snprintf(buf, PAGE_SIZE, "unformatted\n"); break; case DASD_STATE_READY: len = snprintf(buf, PAGE_SIZE, "ready\n"); break; case DASD_STATE_ONLINE: len = snprintf(buf, PAGE_SIZE, "online\n"); break; default: len = snprintf(buf, PAGE_SIZE, "no stat\n"); break; } dasd_put_device(device); } else len = snprintf(buf, PAGE_SIZE, "unknown\n"); return len; } static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); static ssize_t dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; struct dasd_uid uid; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return sprintf(buf, "0\n"); if (device->discipline && device->discipline->get_uid && !device->discipline->get_uid(device, &uid)) { if (uid.type == UA_BASE_PAV_ALIAS || uid.type == UA_HYPER_PAV_ALIAS) { dasd_put_device(device); return sprintf(buf, "1\n"); } } dasd_put_device(device); return sprintf(buf, "0\n"); } static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); static ssize_t dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; struct dasd_uid uid; char *vendor; device = dasd_device_from_cdev(to_ccwdev(dev)); vendor = ""; if (IS_ERR(device)) return snprintf(buf, PAGE_SIZE, "%s\n", vendor); if (device->discipline && device->discipline->get_uid && !device->discipline->get_uid(device, &uid)) vendor = uid.vendor; dasd_put_device(device); return snprintf(buf, PAGE_SIZE, "%s\n", vendor); } static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\ /* vduit */ 32 + 1) static ssize_t dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; struct dasd_uid uid; char uid_string[UID_STRLEN]; char ua_string[3]; device = dasd_device_from_cdev(to_ccwdev(dev)); uid_string[0] = 0; if (IS_ERR(device)) return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); if (device->discipline && device->discipline->get_uid && !device->discipline->get_uid(device, &uid)) { switch (uid.type) { case UA_BASE_DEVICE: snprintf(ua_string, sizeof(ua_string), "%02x", uid.real_unit_addr); break; case UA_BASE_PAV_ALIAS: snprintf(ua_string, sizeof(ua_string), "%02x", uid.base_unit_addr); break; case UA_HYPER_PAV_ALIAS: snprintf(ua_string, sizeof(ua_string), "xx"); break; default: /* should not happen, treat like base device */ snprintf(ua_string, sizeof(ua_string), "%02x", uid.real_unit_addr); break; } if (strlen(uid.vduit) > 0) snprintf(uid_string, sizeof(uid_string), "%s.%s.%04x.%s.%s", uid.vendor, uid.serial, uid.ssid, ua_string, uid.vduit); else snprintf(uid_string, sizeof(uid_string), "%s.%s.%04x.%s", uid.vendor, uid.serial, uid.ssid, ua_string); } dasd_put_device(device); return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); } static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); /* * extended error-reporting */ static ssize_t dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int eer_flag; devmap = dasd_find_busid(dev_name(dev)); if (!IS_ERR(devmap) && devmap->device) eer_flag = dasd_eer_enabled(devmap->device); else eer_flag = 0; return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); } static ssize_t dasd_eer_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; unsigned int val; int rc = 0; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return PTR_ERR(device); if (kstrtouint(buf, 0, &val) || val > 1) return -EINVAL; if (val) rc = dasd_eer_enable(device); else dasd_eer_disable(device); dasd_put_device(device); return rc ? : count; } static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); /* * expiration time for default requests */ static ssize_t dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires); dasd_put_device(device); return len; } static ssize_t dasd_expires_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; unsigned long val; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if ((kstrtoul(buf, 10, &val) != 0) || (val > DASD_EXPIRES_MAX) || val == 0) { dasd_put_device(device); return -EINVAL; } if (val) device->default_expires = val; dasd_put_device(device); return count; } static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); static ssize_t dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries); dasd_put_device(device); return len; } static ssize_t dasd_retries_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; unsigned long val; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if ((kstrtoul(buf, 10, &val) != 0) || (val > DASD_RETRIES_MAX)) { dasd_put_device(device); return -EINVAL; } if (val) device->default_retries = val; dasd_put_device(device); return count; } static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); static ssize_t dasd_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout); dasd_put_device(device); return len; } static ssize_t dasd_timeout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; struct request_queue *q; unsigned long val, flags; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device) || !device->block) return -ENODEV; if ((kstrtoul(buf, 10, &val) != 0) || val > UINT_MAX / HZ) { dasd_put_device(device); return -EINVAL; } q = device->block->request_queue; if (!q) { dasd_put_device(device); return -ENODEV; } spin_lock_irqsave(&device->block->request_queue_lock, flags); if (!val) blk_queue_rq_timed_out(q, NULL); else blk_queue_rq_timed_out(q, dasd_times_out); device->blk_timeout = val; blk_queue_rq_timeout(q, device->blk_timeout * HZ); spin_unlock_irqrestore(&device->block->request_queue_lock, flags); dasd_put_device(device); return count; } static DEVICE_ATTR(timeout, 0644, dasd_timeout_show, dasd_timeout_store); static ssize_t dasd_path_reset_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; unsigned int val; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff) val = 0; if (device->discipline && device->discipline->reset_path) device->discipline->reset_path(device, (__u8) val); dasd_put_device(device); return count; } static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store); static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int hpf; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if (!device->discipline || !device->discipline->hpf_enabled) { dasd_put_device(device); return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx); } hpf = device->discipline->hpf_enabled(device); dasd_put_device(device); return snprintf(buf, PAGE_SIZE, "%d\n", hpf); } static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); static ssize_t dasd_reservation_policy_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; int rc = 0; devmap = dasd_find_busid(dev_name(dev)); if (IS_ERR(devmap)) { rc = snprintf(buf, PAGE_SIZE, "ignore\n"); } else { spin_lock(&dasd_devmap_lock); if (devmap->features & DASD_FEATURE_FAILONSLCK) rc = snprintf(buf, PAGE_SIZE, "fail\n"); else rc = snprintf(buf, PAGE_SIZE, "ignore\n"); spin_unlock(&dasd_devmap_lock); } return rc; } static ssize_t dasd_reservation_policy_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct ccw_device *cdev = to_ccwdev(dev); int rc; if (sysfs_streq("ignore", buf)) rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0); else if (sysfs_streq("fail", buf)) rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1); else rc = -EINVAL; return rc ? : count; } static DEVICE_ATTR(reservation_policy, 0644, dasd_reservation_policy_show, dasd_reservation_policy_store); static ssize_t dasd_reservation_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int rc = 0; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return snprintf(buf, PAGE_SIZE, "none\n"); if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) rc = snprintf(buf, PAGE_SIZE, "reserved\n"); else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) rc = snprintf(buf, PAGE_SIZE, "lost\n"); else rc = snprintf(buf, PAGE_SIZE, "none\n"); dasd_put_device(device); return rc; } static ssize_t dasd_reservation_state_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; int rc = 0; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if (sysfs_streq("reset", buf)) clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); else rc = -EINVAL; dasd_put_device(device); if (rc) return rc; else return count; } static DEVICE_ATTR(last_known_reservation_state, 0644, dasd_reservation_state_show, dasd_reservation_state_store); static ssize_t dasd_pm_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return sprintf(buf, "0\n"); opm = dasd_path_get_opm(device); nppm = dasd_path_get_nppm(device); cablepm = dasd_path_get_cablepm(device); cuirpm = dasd_path_get_cuirpm(device); hpfpm = dasd_path_get_hpfpm(device); ifccpm = dasd_path_get_ifccpm(device); dasd_put_device(device); return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, cablepm, cuirpm, hpfpm, ifccpm); } static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); /* * threshold value for IFCC/CCC errors */ static ssize_t dasd_path_threshold_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld); dasd_put_device(device); return len; } static ssize_t dasd_path_threshold_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; unsigned long flags; unsigned long val; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) { dasd_put_device(device); return -EINVAL; } spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); device->path_thrhld = val; spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); dasd_put_device(device); return count; } static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show, dasd_path_threshold_store); /* * interval for IFCC/CCC checks * meaning time with no IFCC/CCC error before the error counter * gets reset */ static ssize_t dasd_path_interval_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_device *device; int len; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval); dasd_put_device(device); return len; } static ssize_t dasd_path_interval_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; unsigned long flags; unsigned long val; device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; if ((kstrtoul(buf, 10, &val) != 0) || (val > DASD_INTERVAL_MAX) || val == 0) { dasd_put_device(device); return -EINVAL; } spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); if (val) device->path_interval = val; spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); dasd_put_device(device); return count; } static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show, dasd_path_interval_store); static struct attribute * dasd_attrs[] = { &dev_attr_readonly.attr, &dev_attr_discipline.attr, &dev_attr_status.attr, &dev_attr_alias.attr, &dev_attr_vendor.attr, &dev_attr_uid.attr, &dev_attr_use_diag.attr, &dev_attr_raw_track_access.attr, &dev_attr_eer_enabled.attr, &dev_attr_erplog.attr, &dev_attr_failfast.attr, &dev_attr_expires.attr, &dev_attr_retries.attr, &dev_attr_timeout.attr, &dev_attr_reservation_policy.attr, &dev_attr_last_known_reservation_state.attr, &dev_attr_safe_offline.attr, &dev_attr_host_access_count.attr, &dev_attr_path_masks.attr, &dev_attr_path_threshold.attr, &dev_attr_path_interval.attr, &dev_attr_path_reset.attr, &dev_attr_hpf.attr, NULL, }; static struct attribute_group dasd_attr_group = { .attrs = dasd_attrs, }; /* * Return value of the specified feature. */ int dasd_get_feature(struct ccw_device *cdev, int feature) { struct dasd_devmap *devmap; devmap = dasd_find_busid(dev_name(&cdev->dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); return ((devmap->features & feature) != 0); } /* * Set / reset given feature. * Flag indicates whether to set (!=0) or the reset (=0) the feature. */ int dasd_set_feature(struct ccw_device *cdev, int feature, int flag) { struct dasd_devmap *devmap; devmap = dasd_devmap_from_cdev(cdev); if (IS_ERR(devmap)) return PTR_ERR(devmap); spin_lock(&dasd_devmap_lock); if (flag) devmap->features |= feature; else devmap->features &= ~feature; if (devmap->device) devmap->device->features = devmap->features; spin_unlock(&dasd_devmap_lock); return 0; } int dasd_add_sysfs_files(struct ccw_device *cdev) { return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); } void dasd_remove_sysfs_files(struct ccw_device *cdev) { sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); } int dasd_devmap_init(void) { int i; /* Initialize devmap structures. */ dasd_max_devindex = 0; for (i = 0; i < 256; i++) INIT_LIST_HEAD(&dasd_hashlists[i]); return 0; } void dasd_devmap_exit(void) { dasd_forget_ranges(); }