| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| * Horst Hummel <Horst.Hummel@de.ibm.com> |
| * Carsten Otte <Cotte@de.ibm.com> |
| * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| * Bugreports.to..: <Linux390@de.ibm.com> |
| * 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 <linux/ctype.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| |
| #include <asm/debug.h> |
| #include <linux/uaccess.h> |
| #include <asm/ipl.h> |
| |
| /* This is ugly... */ |
| #define PRINTK_HEADER "dasd_devmap:" |
| #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; |
| struct dasd_copy_relation *copy; |
| }; |
| |
| /* |
| * Parameter parsing functions for dasd= parameter. The syntax is: |
| * <devno> : (0x)?[0-9a-fA-F]+ |
| * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ |
| * <feature> : ro |
| * <feature_list> : \(<feature>(:<feature>)*\) |
| * <devno-range> : <devno>(-<devno>)?<feature_list>? |
| * <busid-range> : <busid>(-<busid>)?<feature_list>? |
| * <devices> : <devno-range>|<busid-range> |
| * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod |
| * |
| * <dasd> : autodetect|probeonly|<devices>(,<devices>)* |
| */ |
| |
| 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 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 > 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; |
| int rc = 0; |
| char *tmp; |
| |
| tmp = kstrdup(range, GFP_KERNEL); |
| if (!tmp) |
| return -ENOMEM; |
| |
| if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) { |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| if (dasd_busid(from_str, &from_id0, &from_id1, &from)) { |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| to = from; |
| to_id0 = from_id0; |
| to_id1 = from_id1; |
| if (to_str) { |
| if (dasd_busid(to_str, &to_id0, &to_id1, &to)) { |
| rc = -EINVAL; |
| goto out; |
| } |
| if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) { |
| pr_err("%s is not a valid device range\n", range); |
| rc = -EINVAL; |
| goto out; |
| } |
| } |
| |
| features = dasd_feature_list(features_str); |
| if (features < 0) { |
| rc = -EINVAL; |
| goto out; |
| } |
| /* 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)) { |
| rc = PTR_ERR(devmap); |
| goto out; |
| } |
| } |
| |
| out: |
| kfree(tmp); |
| |
| return rc; |
| } |
| |
| /* |
| * 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++; |
| strscpy(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; |
| } |
| |
| static struct dasd_devmap * |
| dasd_find_busid_locked(const char *bus_id) |
| { |
| struct dasd_devmap *devmap, *tmp; |
| int hash; |
| |
| 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; |
| } |
| } |
| 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; |
| |
| spin_lock(&dasd_devmap_lock); |
| devmap = dasd_find_busid_locked(bus_id); |
| 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); |
| |
| device->paths_info = kset_create_and_add("paths_info", NULL, |
| &device->cdev->dev.kobj); |
| if (!device->paths_info) |
| dev_warn(&cdev->dev, "Could not create paths_info kset\n"); |
| |
| return device; |
| } |
| |
| /* |
| * allocate a PPRC data structure and call the discipline function to fill |
| */ |
| static int dasd_devmap_get_pprc_status(struct dasd_device *device, |
| struct dasd_pprc_data_sc4 **data) |
| { |
| struct dasd_pprc_data_sc4 *temp; |
| |
| if (!device->discipline || !device->discipline->pprc_status) { |
| dev_warn(&device->cdev->dev, "Unable to query copy relation status\n"); |
| return -EOPNOTSUPP; |
| } |
| temp = kzalloc(sizeof(*temp), GFP_KERNEL); |
| if (!temp) |
| return -ENOMEM; |
| |
| /* get PPRC information from storage */ |
| if (device->discipline->pprc_status(device, temp)) { |
| dev_warn(&device->cdev->dev, "Error during copy relation status query\n"); |
| kfree(temp); |
| return -EINVAL; |
| } |
| *data = temp; |
| |
| return 0; |
| } |
| |
| /* |
| * find an entry in a PPRC device_info array by a given UID |
| * depending on the primary/secondary state of the device it has to be |
| * matched with the respective fields |
| */ |
| static int dasd_devmap_entry_from_pprc_data(struct dasd_pprc_data_sc4 *data, |
| struct dasd_uid uid, |
| bool primary) |
| { |
| int i; |
| |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (primary) { |
| if (data->dev_info[i].prim_cu_ssid == uid.ssid && |
| data->dev_info[i].primary == uid.real_unit_addr) |
| return i; |
| } else { |
| if (data->dev_info[i].sec_cu_ssid == uid.ssid && |
| data->dev_info[i].secondary == uid.real_unit_addr) |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| /* |
| * check the consistency of a specified copy relation by checking |
| * the following things: |
| * |
| * - is the given device part of a copy pair setup |
| * - does the state of the device match the state in the PPRC status data |
| * - does the device UID match with the UID in the PPRC status data |
| * - to prevent misrouted IO check if the given device is present in all |
| * related PPRC status data |
| */ |
| static int dasd_devmap_check_copy_relation(struct dasd_device *device, |
| struct dasd_copy_entry *entry, |
| struct dasd_pprc_data_sc4 *data, |
| struct dasd_copy_relation *copy) |
| { |
| struct dasd_pprc_data_sc4 *tmp_dat; |
| struct dasd_device *tmp_dev; |
| struct dasd_uid uid; |
| int i, j; |
| |
| if (!device->discipline || !device->discipline->get_uid || |
| device->discipline->get_uid(device, &uid)) |
| return 1; |
| |
| i = dasd_devmap_entry_from_pprc_data(data, uid, entry->primary); |
| if (i < 0) { |
| dev_warn(&device->cdev->dev, "Device not part of a copy relation\n"); |
| return 1; |
| } |
| |
| /* double check which role the current device has */ |
| if (entry->primary) { |
| if (data->dev_info[i].flags & 0x80) { |
| dev_warn(&device->cdev->dev, "Copy pair secondary is setup as primary\n"); |
| return 1; |
| } |
| if (data->dev_info[i].prim_cu_ssid != uid.ssid || |
| data->dev_info[i].primary != uid.real_unit_addr) { |
| dev_warn(&device->cdev->dev, |
| "Primary device %s does not match copy pair status primary device %04x\n", |
| dev_name(&device->cdev->dev), |
| data->dev_info[i].prim_cu_ssid | |
| data->dev_info[i].primary); |
| return 1; |
| } |
| } else { |
| if (!(data->dev_info[i].flags & 0x80)) { |
| dev_warn(&device->cdev->dev, "Copy pair primary is setup as secondary\n"); |
| return 1; |
| } |
| if (data->dev_info[i].sec_cu_ssid != uid.ssid || |
| data->dev_info[i].secondary != uid.real_unit_addr) { |
| dev_warn(&device->cdev->dev, |
| "Secondary device %s does not match copy pair status secondary device %04x\n", |
| dev_name(&device->cdev->dev), |
| data->dev_info[i].sec_cu_ssid | |
| data->dev_info[i].secondary); |
| return 1; |
| } |
| } |
| |
| /* |
| * the current device has to be part of the copy relation of all |
| * entries to prevent misrouted IO to another copy pair |
| */ |
| for (j = 0; j < DASD_CP_ENTRIES; j++) { |
| if (entry == ©->entry[j]) |
| tmp_dev = device; |
| else |
| tmp_dev = copy->entry[j].device; |
| |
| if (!tmp_dev) |
| continue; |
| |
| if (dasd_devmap_get_pprc_status(tmp_dev, &tmp_dat)) |
| return 1; |
| |
| if (dasd_devmap_entry_from_pprc_data(tmp_dat, uid, entry->primary) < 0) { |
| dev_warn(&tmp_dev->cdev->dev, |
| "Copy pair relation does not contain device: %s\n", |
| dev_name(&device->cdev->dev)); |
| kfree(tmp_dat); |
| return 1; |
| } |
| kfree(tmp_dat); |
| } |
| return 0; |
| } |
| |
| /* delete device from copy relation entry */ |
| static void dasd_devmap_delete_copy_relation_device(struct dasd_device *device) |
| { |
| struct dasd_copy_relation *copy; |
| int i; |
| |
| if (!device->copy) |
| return; |
| |
| copy = device->copy; |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (copy->entry[i].device == device) |
| copy->entry[i].device = NULL; |
| } |
| dasd_put_device(device); |
| device->copy = NULL; |
| } |
| |
| /* |
| * read all required information for a copy relation setup and setup the device |
| * accordingly |
| */ |
| int dasd_devmap_set_device_copy_relation(struct ccw_device *cdev, |
| bool pprc_enabled) |
| { |
| struct dasd_pprc_data_sc4 *data = NULL; |
| struct dasd_copy_entry *entry = NULL; |
| struct dasd_copy_relation *copy; |
| struct dasd_devmap *devmap; |
| struct dasd_device *device; |
| int i, rc = 0; |
| |
| devmap = dasd_devmap_from_cdev(cdev); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| |
| device = devmap->device; |
| if (!device) |
| return -ENODEV; |
| |
| copy = devmap->copy; |
| /* no copy pair setup for this device */ |
| if (!copy) |
| goto out; |
| |
| rc = dasd_devmap_get_pprc_status(device, &data); |
| if (rc) |
| return rc; |
| |
| /* print error if PPRC is requested but not enabled on storage server */ |
| if (!pprc_enabled) { |
| dev_err(&cdev->dev, "Copy relation not enabled on storage server\n"); |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| if (!data->dev_info[0].state) { |
| dev_warn(&device->cdev->dev, "Copy pair setup requested for device not in copy relation\n"); |
| rc = -EINVAL; |
| goto out; |
| } |
| /* find entry */ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (copy->entry[i].configured && |
| strncmp(dev_name(&cdev->dev), |
| copy->entry[i].busid, DASD_BUS_ID_SIZE) == 0) { |
| entry = ©->entry[i]; |
| break; |
| } |
| } |
| if (!entry) { |
| dev_warn(&device->cdev->dev, "Copy relation entry not found\n"); |
| rc = -EINVAL; |
| goto out; |
| } |
| /* check if the copy relation is valid */ |
| if (dasd_devmap_check_copy_relation(device, entry, data, copy)) { |
| dev_warn(&device->cdev->dev, "Copy relation faulty\n"); |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| dasd_get_device(device); |
| copy->entry[i].device = device; |
| device->copy = copy; |
| out: |
| kfree(data); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(dasd_devmap_set_device_copy_relation); |
| |
| /* |
| * 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); |
| |
| /* Removve copy relation */ |
| dasd_devmap_delete_copy_relation_device(device); |
| /* |
| * 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); |
| |
| kset_unregister(device->paths_info); |
| |
| /* 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); |
| } |
| EXPORT_SYMBOL(dasd_add_link_to_gendisk); |
| |
| 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 sysfs_emit(buf, 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; |
| struct dasd_device *device; |
| int ro_flag = 0; |
| |
| devmap = dasd_find_busid(dev_name(dev)); |
| if (IS_ERR(devmap)) |
| goto out; |
| |
| ro_flag = !!(devmap->features & DASD_FEATURE_READONLY); |
| |
| spin_lock(&dasd_devmap_lock); |
| device = devmap->device; |
| if (device) |
| ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags); |
| spin_unlock(&dasd_devmap_lock); |
| |
| out: |
| return sysfs_emit(buf, 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 count; |
| |
| 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 sysfs_emit(buf, 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; |
| unsigned long flags; |
| int rc; |
| |
| spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| device = dasd_device_from_cdev_locked(cdev); |
| if (IS_ERR(device)) { |
| rc = PTR_ERR(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 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); |
| spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| rc = -EBUSY; |
| goto out; |
| } |
| |
| set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); |
| dasd_put_device(device); |
| spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| |
| 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 = sysfs_emit(buf, "%s\n", |
| device->discipline->name); |
| dasd_put_device(device); |
| return len; |
| } |
| out: |
| len = sysfs_emit(buf, "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 = sysfs_emit(buf, "new\n"); |
| break; |
| case DASD_STATE_KNOWN: |
| len = sysfs_emit(buf, "detected\n"); |
| break; |
| case DASD_STATE_BASIC: |
| len = sysfs_emit(buf, "basic\n"); |
| break; |
| case DASD_STATE_UNFMT: |
| len = sysfs_emit(buf, "unformatted\n"); |
| break; |
| case DASD_STATE_READY: |
| len = sysfs_emit(buf, "ready\n"); |
| break; |
| case DASD_STATE_ONLINE: |
| len = sysfs_emit(buf, "online\n"); |
| break; |
| default: |
| len = sysfs_emit(buf, "no stat\n"); |
| break; |
| } |
| dasd_put_device(device); |
| } else |
| len = sysfs_emit(buf, "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 sysfs_emit(buf, "%s\n", vendor); |
| |
| if (device->discipline && device->discipline->get_uid && |
| !device->discipline->get_uid(device, &uid)) |
| vendor = uid.vendor; |
| |
| dasd_put_device(device); |
| |
| return sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, 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 = sysfs_emit(buf, "%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 = sysfs_emit(buf, "%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 = sysfs_emit(buf, "%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; |
| unsigned long val; |
| |
| 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; |
| } |
| if (!device->block->gdp) { |
| dasd_put_device(device); |
| return -ENODEV; |
| } |
| |
| device->blk_timeout = val; |
| blk_queue_rq_timeout(device->block->gdp->queue, val * HZ); |
| |
| 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 sysfs_emit(buf, "%d\n", dasd_nofcx); |
| } |
| hpf = device->discipline->hpf_enabled(device); |
| dasd_put_device(device); |
| return sysfs_emit(buf, "%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 = sysfs_emit(buf, "ignore\n"); |
| } else { |
| spin_lock(&dasd_devmap_lock); |
| if (devmap->features & DASD_FEATURE_FAILONSLCK) |
| rc = sysfs_emit(buf, "fail\n"); |
| else |
| rc = sysfs_emit(buf, "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 sysfs_emit(buf, "none\n"); |
| |
| if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) |
| rc = sysfs_emit(buf, "reserved\n"); |
| else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) |
| rc = sysfs_emit(buf, "lost\n"); |
| else |
| rc = sysfs_emit(buf, "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 = sysfs_emit(buf, "%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); |
| |
| /* |
| * configure if path is disabled after IFCC/CCC error threshold is |
| * exceeded |
| */ |
| static ssize_t |
| dasd_path_autodisable_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct dasd_devmap *devmap; |
| int flag; |
| |
| devmap = dasd_find_busid(dev_name(dev)); |
| if (!IS_ERR(devmap)) |
| flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0; |
| else |
| flag = (DASD_FEATURE_DEFAULT & |
| DASD_FEATURE_PATH_AUTODISABLE) != 0; |
| return sysfs_emit(buf, flag ? "1\n" : "0\n"); |
| } |
| |
| static ssize_t |
| dasd_path_autodisable_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_PATH_AUTODISABLE, val); |
| |
| return rc ? : count; |
| } |
| |
| static DEVICE_ATTR(path_autodisable, 0644, |
| dasd_path_autodisable_show, |
| dasd_path_autodisable_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 = sysfs_emit(buf, "%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 ssize_t |
| dasd_device_fcs_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct dasd_device *device; |
| int fc_sec; |
| int rc; |
| |
| device = dasd_device_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(device)) |
| return -ENODEV; |
| fc_sec = dasd_path_get_fcs_device(device); |
| if (fc_sec == -EINVAL) |
| rc = sysfs_emit(buf, "Inconsistent\n"); |
| else |
| rc = sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); |
| dasd_put_device(device); |
| |
| return rc; |
| } |
| static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL); |
| |
| static ssize_t |
| dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) |
| { |
| struct dasd_path *path = to_dasd_path(kobj); |
| unsigned int fc_sec = path->fc_security; |
| |
| return sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); |
| } |
| |
| static struct kobj_attribute path_fcs_attribute = |
| __ATTR(fc_security, 0444, dasd_path_fcs_show, NULL); |
| |
| /* |
| * print copy relation in the form |
| * primary,secondary[1] primary,secondary[2], ... |
| */ |
| static ssize_t |
| dasd_copy_pair_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| char prim_busid[DASD_BUS_ID_SIZE]; |
| struct dasd_copy_relation *copy; |
| struct dasd_devmap *devmap; |
| int len = 0; |
| int i; |
| |
| devmap = dasd_find_busid(dev_name(dev)); |
| if (IS_ERR(devmap)) |
| return -ENODEV; |
| |
| if (!devmap->copy) |
| return -ENODEV; |
| |
| copy = devmap->copy; |
| /* find primary */ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (copy->entry[i].configured && copy->entry[i].primary) { |
| strscpy(prim_busid, copy->entry[i].busid, |
| DASD_BUS_ID_SIZE); |
| break; |
| } |
| } |
| if (i == DASD_CP_ENTRIES) |
| goto out; |
| |
| /* print all secondary */ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (copy->entry[i].configured && !copy->entry[i].primary) |
| len += sysfs_emit_at(buf, len, "%s,%s ", prim_busid, |
| copy->entry[i].busid); |
| } |
| |
| len += sysfs_emit_at(buf, len, "\n"); |
| out: |
| return len; |
| } |
| |
| static int dasd_devmap_set_copy_relation(struct dasd_devmap *devmap, |
| struct dasd_copy_relation *copy, |
| char *busid, bool primary) |
| { |
| int i; |
| |
| /* find free entry */ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| /* current bus_id already included, nothing to do */ |
| if (copy->entry[i].configured && |
| strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) |
| return 0; |
| |
| if (!copy->entry[i].configured) |
| break; |
| } |
| if (i == DASD_CP_ENTRIES) |
| return -EINVAL; |
| |
| copy->entry[i].configured = true; |
| strscpy(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE); |
| if (primary) { |
| copy->active = ©->entry[i]; |
| copy->entry[i].primary = true; |
| } |
| if (!devmap->copy) |
| devmap->copy = copy; |
| |
| return 0; |
| } |
| |
| static void dasd_devmap_del_copy_relation(struct dasd_copy_relation *copy, |
| char *busid) |
| { |
| int i; |
| |
| spin_lock(&dasd_devmap_lock); |
| /* find entry */ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (copy->entry[i].configured && |
| strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) |
| break; |
| } |
| if (i == DASD_CP_ENTRIES || !copy->entry[i].configured) { |
| spin_unlock(&dasd_devmap_lock); |
| return; |
| } |
| |
| copy->entry[i].configured = false; |
| memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); |
| if (copy->active == ©->entry[i]) { |
| copy->active = NULL; |
| copy->entry[i].primary = false; |
| } |
| spin_unlock(&dasd_devmap_lock); |
| } |
| |
| static int dasd_devmap_clear_copy_relation(struct device *dev) |
| { |
| struct dasd_copy_relation *copy; |
| struct dasd_devmap *devmap; |
| int i, rc = 1; |
| |
| devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(devmap)) |
| return 1; |
| |
| spin_lock(&dasd_devmap_lock); |
| if (!devmap->copy) |
| goto out; |
| |
| copy = devmap->copy; |
| /* first check if all secondary devices are offline*/ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (!copy->entry[i].configured) |
| continue; |
| |
| if (copy->entry[i].device == copy->active->device) |
| continue; |
| |
| if (copy->entry[i].device) |
| goto out; |
| } |
| /* clear all devmap entries */ |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (strlen(copy->entry[i].busid) == 0) |
| continue; |
| if (copy->entry[i].device) { |
| dasd_put_device(copy->entry[i].device); |
| copy->entry[i].device->copy = NULL; |
| copy->entry[i].device = NULL; |
| } |
| devmap = dasd_find_busid_locked(copy->entry[i].busid); |
| devmap->copy = NULL; |
| memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); |
| } |
| kfree(copy); |
| rc = 0; |
| out: |
| spin_unlock(&dasd_devmap_lock); |
| return rc; |
| } |
| |
| /* |
| * parse BUSIDs from a copy pair |
| */ |
| static int dasd_devmap_parse_busid(const char *buf, char *prim_busid, |
| char *sec_busid) |
| { |
| char *primary, *secondary, *tmp, *pt; |
| int id0, id1, id2; |
| |
| pt = kstrdup(buf, GFP_KERNEL); |
| tmp = pt; |
| if (!tmp) |
| return -ENOMEM; |
| |
| primary = strsep(&tmp, ","); |
| if (!primary) { |
| kfree(pt); |
| return -EINVAL; |
| } |
| secondary = strsep(&tmp, ","); |
| if (!secondary) { |
| kfree(pt); |
| return -EINVAL; |
| } |
| if (dasd_busid(primary, &id0, &id1, &id2)) { |
| kfree(pt); |
| return -EINVAL; |
| } |
| sprintf(prim_busid, "%01x.%01x.%04x", id0, id1, id2); |
| if (dasd_busid(secondary, &id0, &id1, &id2)) { |
| kfree(pt); |
| return -EINVAL; |
| } |
| sprintf(sec_busid, "%01x.%01x.%04x", id0, id1, id2); |
| kfree(pt); |
| |
| return 0; |
| } |
| |
| static ssize_t dasd_copy_pair_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct dasd_devmap *prim_devmap, *sec_devmap; |
| char prim_busid[DASD_BUS_ID_SIZE]; |
| char sec_busid[DASD_BUS_ID_SIZE]; |
| struct dasd_copy_relation *copy; |
| struct dasd_device *device; |
| bool pprc_enabled; |
| int rc; |
| |
| if (strncmp(buf, "clear", strlen("clear")) == 0) { |
| if (dasd_devmap_clear_copy_relation(dev)) |
| return -EINVAL; |
| return count; |
| } |
| |
| rc = dasd_devmap_parse_busid(buf, prim_busid, sec_busid); |
| if (rc) |
| return rc; |
| |
| if (strncmp(dev_name(dev), prim_busid, DASD_BUS_ID_SIZE) != 0 && |
| strncmp(dev_name(dev), sec_busid, DASD_BUS_ID_SIZE) != 0) |
| return -EINVAL; |
| |
| /* allocate primary devmap if needed */ |
| prim_devmap = dasd_find_busid(prim_busid); |
| if (IS_ERR(prim_devmap)) |
| prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT); |
| |
| /* allocate secondary devmap if needed */ |
| sec_devmap = dasd_find_busid(sec_busid); |
| if (IS_ERR(sec_devmap)) |
| sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT); |
| |
| /* setting copy relation is only allowed for offline secondary */ |
| if (sec_devmap->device) |
| return -EINVAL; |
| |
| if (prim_devmap->copy) { |
| copy = prim_devmap->copy; |
| } else if (sec_devmap->copy) { |
| copy = sec_devmap->copy; |
| } else { |
| copy = kzalloc(sizeof(*copy), GFP_KERNEL); |
| if (!copy) |
| return -ENOMEM; |
| } |
| spin_lock(&dasd_devmap_lock); |
| rc = dasd_devmap_set_copy_relation(prim_devmap, copy, prim_busid, true); |
| if (rc) { |
| spin_unlock(&dasd_devmap_lock); |
| return rc; |
| } |
| rc = dasd_devmap_set_copy_relation(sec_devmap, copy, sec_busid, false); |
| if (rc) { |
| spin_unlock(&dasd_devmap_lock); |
| return rc; |
| } |
| spin_unlock(&dasd_devmap_lock); |
| |
| /* if primary device is already online call device setup directly */ |
| if (prim_devmap->device && !prim_devmap->device->copy) { |
| device = prim_devmap->device; |
| if (device->discipline->pprc_enabled) { |
| pprc_enabled = device->discipline->pprc_enabled(device); |
| rc = dasd_devmap_set_device_copy_relation(device->cdev, |
| pprc_enabled); |
| } else { |
| rc = -EOPNOTSUPP; |
| } |
| } |
| if (rc) { |
| dasd_devmap_del_copy_relation(copy, prim_busid); |
| dasd_devmap_del_copy_relation(copy, sec_busid); |
| count = rc; |
| } |
| |
| return count; |
| } |
| static DEVICE_ATTR(copy_pair, 0644, dasd_copy_pair_show, |
| dasd_copy_pair_store); |
| |
| static ssize_t |
| dasd_copy_role_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct dasd_copy_relation *copy; |
| struct dasd_device *device; |
| int len, i; |
| |
| device = dasd_device_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(device)) |
| return -ENODEV; |
| |
| if (!device->copy) { |
| len = sysfs_emit(buf, "none\n"); |
| goto out; |
| } |
| copy = device->copy; |
| /* only the active device is primary */ |
| if (copy->active->device == device) { |
| len = sysfs_emit(buf, "primary\n"); |
| goto out; |
| } |
| for (i = 0; i < DASD_CP_ENTRIES; i++) { |
| if (copy->entry[i].device == device) { |
| len = sysfs_emit(buf, "secondary\n"); |
| goto out; |
| } |
| } |
| /* not in the list, no COPY role */ |
| len = sysfs_emit(buf, "none\n"); |
| out: |
| dasd_put_device(device); |
| return len; |
| } |
| static DEVICE_ATTR(copy_role, 0444, dasd_copy_role_show, NULL); |
| |
| static ssize_t dasd_device_ping(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct dasd_device *device; |
| size_t rc; |
| |
| device = dasd_device_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(device)) |
| return -ENODEV; |
| |
| /* |
| * do not try during offline processing |
| * early check only |
| * the sleep_on function itself checks for offline |
| * processing again |
| */ |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { |
| rc = -EBUSY; |
| goto out; |
| } |
| if (!device->discipline || !device->discipline->device_ping) { |
| rc = -EOPNOTSUPP; |
| goto out; |
| } |
| rc = device->discipline->device_ping(device); |
| if (!rc) |
| rc = count; |
| out: |
| dasd_put_device(device); |
| return rc; |
| } |
| static DEVICE_ATTR(ping, 0200, NULL, dasd_device_ping); |
| |
| #define DASD_DEFINE_ATTR(_name, _func) \ |
| static ssize_t dasd_##_name##_show(struct device *dev, \ |
| struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| struct ccw_device *cdev = to_ccwdev(dev); \ |
| struct dasd_device *device = dasd_device_from_cdev(cdev); \ |
| int val = 0; \ |
| \ |
| if (IS_ERR(device)) \ |
| return -ENODEV; \ |
| if (device->discipline && _func) \ |
| val = _func(device); \ |
| dasd_put_device(device); \ |
| \ |
| return sysfs_emit(buf, "%d\n", val); \ |
| } \ |
| static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \ |
| |
| DASD_DEFINE_ATTR(ese, device->discipline->is_ese); |
| DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size); |
| DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id); |
| DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured); |
| DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated); |
| DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity); |
| DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld); |
| DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel); |
| DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos); |
| |
| 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_autodisable.attr, |
| &dev_attr_path_interval.attr, |
| &dev_attr_path_reset.attr, |
| &dev_attr_hpf.attr, |
| &dev_attr_ese.attr, |
| &dev_attr_fc_security.attr, |
| &dev_attr_copy_pair.attr, |
| &dev_attr_copy_role.attr, |
| &dev_attr_ping.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group dasd_attr_group = { |
| .attrs = dasd_attrs, |
| }; |
| |
| static struct attribute *capacity_attrs[] = { |
| &dev_attr_space_configured.attr, |
| &dev_attr_space_allocated.attr, |
| &dev_attr_logical_capacity.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group capacity_attr_group = { |
| .name = "capacity", |
| .attrs = capacity_attrs, |
| }; |
| |
| static struct attribute *ext_pool_attrs[] = { |
| &dev_attr_pool_id.attr, |
| &dev_attr_extent_size.attr, |
| &dev_attr_warn_threshold.attr, |
| &dev_attr_cap_at_warnlevel.attr, |
| &dev_attr_pool_oos.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ext_pool_attr_group = { |
| .name = "extent_pool", |
| .attrs = ext_pool_attrs, |
| }; |
| |
| const struct attribute_group *dasd_dev_groups[] = { |
| &dasd_attr_group, |
| &capacity_attr_group, |
| &ext_pool_attr_group, |
| NULL, |
| }; |
| EXPORT_SYMBOL_GPL(dasd_dev_groups); |
| |
| /* |
| * 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; |
| } |
| EXPORT_SYMBOL(dasd_set_feature); |
| |
| static struct attribute *paths_info_attrs[] = { |
| &path_fcs_attribute.attr, |
| NULL, |
| }; |
| ATTRIBUTE_GROUPS(paths_info); |
| |
| static struct kobj_type path_attr_type = { |
| .release = dasd_path_release, |
| .default_groups = paths_info_groups, |
| .sysfs_ops = &kobj_sysfs_ops, |
| }; |
| |
| static void dasd_path_init_kobj(struct dasd_device *device, int chp) |
| { |
| device->path[chp].kobj.kset = device->paths_info; |
| kobject_init(&device->path[chp].kobj, &path_attr_type); |
| } |
| |
| void dasd_path_create_kobj(struct dasd_device *device, int chp) |
| { |
| int rc; |
| |
| if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) |
| return; |
| if (!device->paths_info) { |
| dev_warn(&device->cdev->dev, "Unable to create paths objects\n"); |
| return; |
| } |
| if (device->path[chp].in_sysfs) |
| return; |
| if (!device->path[chp].conf_data) |
| return; |
| |
| dasd_path_init_kobj(device, chp); |
| |
| rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x", |
| device->path[chp].cssid, device->path[chp].chpid); |
| if (rc) |
| kobject_put(&device->path[chp].kobj); |
| device->path[chp].in_sysfs = true; |
| } |
| EXPORT_SYMBOL(dasd_path_create_kobj); |
| |
| void dasd_path_create_kobjects(struct dasd_device *device) |
| { |
| u8 lpm, opm; |
| |
| opm = dasd_path_get_opm(device); |
| for (lpm = 0x80; lpm; lpm >>= 1) { |
| if (!(lpm & opm)) |
| continue; |
| dasd_path_create_kobj(device, pathmask_to_pos(lpm)); |
| } |
| } |
| EXPORT_SYMBOL(dasd_path_create_kobjects); |
| |
| static void dasd_path_remove_kobj(struct dasd_device *device, int chp) |
| { |
| if (device->path[chp].in_sysfs) { |
| kobject_put(&device->path[chp].kobj); |
| device->path[chp].in_sysfs = false; |
| } |
| } |
| |
| /* |
| * As we keep kobjects for the lifetime of a device, this function must not be |
| * called anywhere but in the context of offlining a device. |
| */ |
| void dasd_path_remove_kobjects(struct dasd_device *device) |
| { |
| int i; |
| |
| for (i = 0; i < 8; i++) |
| dasd_path_remove_kobj(device, i); |
| } |
| EXPORT_SYMBOL(dasd_path_remove_kobjects); |
| |
| 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(); |
| } |