diff options
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 2497 |
1 files changed, 2497 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c new file mode 100644 index 000000000..b2a4c3433 --- /dev/null +++ b/drivers/s390/block/dasd_devmap.c @@ -0,0 +1,2497 @@ +// 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); + +static ssize_t +dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + char uid_string[DASD_UID_STRLEN]; + struct dasd_device *device; + struct dasd_uid uid; + 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(); +} |