diff options
Diffstat (limited to 'drivers/s390/block/dasd_devmap.c')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 979 |
1 files changed, 896 insertions, 83 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index 32fc51341d99..73972900fc55 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -13,20 +13,17 @@ * */ -#define KMSG_COMPONENT "dasd" - +#include <linux/export.h> #include <linux/ctype.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> +#include <asm/machine.h> #include <asm/debug.h> #include <linux/uaccess.h> #include <asm/ipl.h> -/* This is ugly... */ -#define PRINTK_HEADER "dasd_devmap:" -#define DASD_BUS_ID_SIZE 20 #define DASD_MAX_PARAMS 256 #include "dasd_int.h" @@ -50,6 +47,8 @@ struct dasd_devmap { unsigned int devindex; unsigned short features; struct dasd_device *device; + struct dasd_copy_relation *copy; + unsigned int aq_mask; }; /* @@ -130,7 +129,7 @@ __setup ("dasd=", dasd_call_setup); /* * Read a device busid/devno from a string. */ -static int __init dasd_busid(char *str, int *id0, int *id1, int *devno) +static int dasd_busid(char *str, int *id0, int *id1, int *devno) { unsigned int val; char *tok; @@ -237,7 +236,7 @@ static int __init dasd_parse_keyword(char *keyword) return 0; } if (strncmp("nopav", keyword, length) == 0) { - if (MACHINE_IS_VM) + if (machine_is_vm()) pr_info("'nopav' is not supported on z/VM\n"); else { dasd_nopav = 1; @@ -356,7 +355,8 @@ static int __init dasd_parse_range(const char *range) /* 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++); + scnprintf(bus_id, sizeof(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); @@ -426,7 +426,7 @@ dasd_add_busid(const char *bus_id, int features) if (!devmap) { /* This bus_id is new. */ new->devindex = dasd_max_devindex++; - strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); + strscpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); new->features = features; new->device = NULL; list_add(&new->list, &dasd_hashlists[hash]); @@ -438,16 +438,12 @@ dasd_add_busid(const char *bus_id, int features) return devmap; } -/* - * Find devmap for device with given bus_id. - */ static struct dasd_devmap * -dasd_find_busid(const char *bus_id) +dasd_find_busid_locked(const char *bus_id) { struct dasd_devmap *devmap, *tmp; int hash; - spin_lock(&dasd_devmap_lock); devmap = ERR_PTR(-ENODEV); hash = dasd_hash_busid(bus_id); list_for_each_entry(tmp, &dasd_hashlists[hash], list) { @@ -456,6 +452,19 @@ dasd_find_busid(const char *bus_id) 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; } @@ -576,10 +585,247 @@ dasd_create_device(struct ccw_device *cdev) 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); @@ -612,6 +858,8 @@ dasd_delete_device(struct dasd_device *device) dev_set_drvdata(&device->cdev->dev, NULL); spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + /* Remove 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. @@ -622,6 +870,9 @@ dasd_delete_device(struct dasd_device *device) 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; @@ -686,6 +937,7 @@ void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) 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) { @@ -723,7 +975,7 @@ static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; else ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; - return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n"); + return sysfs_emit(buf, ff_flag ? "1\n" : "0\n"); } static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, @@ -765,7 +1017,7 @@ dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) spin_unlock(&dasd_devmap_lock); out: - return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); + return sysfs_emit(buf, ro_flag ? "1\n" : "0\n"); } static ssize_t @@ -826,7 +1078,7 @@ dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; else erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; - return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); + return sysfs_emit(buf, erplog ? "1\n" : "0\n"); } static ssize_t @@ -861,7 +1113,7 @@ dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) 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"); + return sysfs_emit(buf, use_diag ? "1\n" : "0\n"); } static ssize_t @@ -910,7 +1162,7 @@ dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) 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"); + return sysfs_emit(buf, use_raw ? "1\n" : "0\n"); } static ssize_t @@ -1006,7 +1258,7 @@ dasd_access_show(struct device *dev, struct device_attribute *attr, if (count < 0) return count; - return sprintf(buf, "%d\n", count); + return sysfs_emit(buf, "%d\n", count); } static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL); @@ -1025,13 +1277,13 @@ dasd_discipline_show(struct device *dev, struct device_attribute *attr, dasd_put_device(device); goto out; } else { - len = snprintf(buf, PAGE_SIZE, "%s\n", - device->discipline->name); + len = sysfs_emit(buf, "%s\n", + device->discipline->name); dasd_put_device(device); return len; } out: - len = snprintf(buf, PAGE_SIZE, "none\n"); + len = sysfs_emit(buf, "none\n"); return len; } @@ -1048,30 +1300,30 @@ dasd_device_status_show(struct device *dev, struct device_attribute *attr, if (!IS_ERR(device)) { switch (device->state) { case DASD_STATE_NEW: - len = snprintf(buf, PAGE_SIZE, "new\n"); + len = sysfs_emit(buf, "new\n"); break; case DASD_STATE_KNOWN: - len = snprintf(buf, PAGE_SIZE, "detected\n"); + len = sysfs_emit(buf, "detected\n"); break; case DASD_STATE_BASIC: - len = snprintf(buf, PAGE_SIZE, "basic\n"); + len = sysfs_emit(buf, "basic\n"); break; case DASD_STATE_UNFMT: - len = snprintf(buf, PAGE_SIZE, "unformatted\n"); + len = sysfs_emit(buf, "unformatted\n"); break; case DASD_STATE_READY: - len = snprintf(buf, PAGE_SIZE, "ready\n"); + len = sysfs_emit(buf, "ready\n"); break; case DASD_STATE_ONLINE: - len = snprintf(buf, PAGE_SIZE, "online\n"); + len = sysfs_emit(buf, "online\n"); break; default: - len = snprintf(buf, PAGE_SIZE, "no stat\n"); + len = sysfs_emit(buf, "no stat\n"); break; } dasd_put_device(device); } else - len = snprintf(buf, PAGE_SIZE, "unknown\n"); + len = sysfs_emit(buf, "unknown\n"); return len; } @@ -1085,19 +1337,19 @@ static ssize_t dasd_alias_show(struct device *dev, device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) - return sprintf(buf, "0\n"); + return sysfs_emit(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"); + return sysfs_emit(buf, "1\n"); } } dasd_put_device(device); - return sprintf(buf, "0\n"); + return sysfs_emit(buf, "0\n"); } static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); @@ -1112,7 +1364,7 @@ static ssize_t dasd_vendor_show(struct device *dev, device = dasd_device_from_cdev(to_ccwdev(dev)); vendor = ""; if (IS_ERR(device)) - return snprintf(buf, PAGE_SIZE, "%s\n", vendor); + return sysfs_emit(buf, "%s\n", vendor); if (device->discipline && device->discipline->get_uid && !device->discipline->get_uid(device, &uid)) @@ -1120,27 +1372,23 @@ static ssize_t dasd_vendor_show(struct device *dev, dasd_put_device(device); - return snprintf(buf, PAGE_SIZE, "%s\n", vendor); + 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) { + char uid_string[DASD_UID_STRLEN]; struct dasd_device *device; struct dasd_uid uid; - char uid_string[UID_STRLEN]; char ua_string[3]; device = dasd_device_from_cdev(to_ccwdev(dev)); uid_string[0] = 0; if (IS_ERR(device)) - return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); + return sysfs_emit(buf, "%s\n", uid_string); if (device->discipline && device->discipline->get_uid && !device->discipline->get_uid(device, &uid)) { @@ -1163,19 +1411,13 @@ dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) 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); + snprintf(uid_string, sizeof(uid_string), "%s.%s.%04x.%s%s%s", + uid.vendor, uid.serial, uid.ssid, ua_string, + uid.vduit[0] ? "." : "", uid.vduit); } dasd_put_device(device); - return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); + return sysfs_emit(buf, "%s\n", uid_string); } static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); @@ -1193,7 +1435,7 @@ dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) eer_flag = dasd_eer_enabled(devmap->device); else eer_flag = 0; - return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); + return sysfs_emit(buf, eer_flag ? "1\n" : "0\n"); } static ssize_t @@ -1224,6 +1466,128 @@ dasd_eer_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); /* + * aq_mask controls if the DASD should be quiesced on certain triggers + * The aq_mask attribute is interpreted as bitmap of the DASD_EER_* triggers. + */ +static ssize_t dasd_aq_mask_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_devmap *devmap; + unsigned int aq_mask = 0; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + aq_mask = devmap->aq_mask; + + return sysfs_emit(buf, "%d\n", aq_mask); +} + +static ssize_t dasd_aq_mask_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + unsigned int val; + + if (kstrtouint(buf, 0, &val) || val > DASD_EER_VALID) + return -EINVAL; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + spin_lock(&dasd_devmap_lock); + devmap->aq_mask = val; + if (devmap->device) + devmap->device->aq_mask = devmap->aq_mask; + spin_unlock(&dasd_devmap_lock); + + return count; +} + +static DEVICE_ATTR(aq_mask, 0644, dasd_aq_mask_show, dasd_aq_mask_store); + +/* + * aq_requeue controls if requests are returned to the blocklayer on quiesce + * or if requests are only not started + */ +static ssize_t dasd_aqr_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_REQUEUEQUIESCE) != 0; + else + flag = (DASD_FEATURE_DEFAULT & + DASD_FEATURE_REQUEUEQUIESCE) != 0; + return sysfs_emit(buf, "%d\n", flag); +} + +static ssize_t dasd_aqr_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + bool val; + int rc; + + if (kstrtobool(buf, &val)) + return -EINVAL; + + rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_REQUEUEQUIESCE, val); + + return rc ? : count; +} + +static DEVICE_ATTR(aq_requeue, 0644, dasd_aqr_show, dasd_aqr_store); + +/* + * aq_timeouts controls how much retries have to time out until + * a device gets autoquiesced + */ +static ssize_t +dasd_aq_timeouts_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, "%u\n", device->aq_timeouts); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_aq_timeouts_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, 10, &val) != 0) || + val > DASD_RETRIES_MAX || val == 0) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->aq_timeouts = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(aq_timeouts, 0644, dasd_aq_timeouts_show, + dasd_aq_timeouts_store); + +/* * expiration time for default requests */ static ssize_t @@ -1235,7 +1599,7 @@ dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; - len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires); + len = sysfs_emit(buf, "%lu\n", device->default_expires); dasd_put_device(device); return len; } @@ -1275,7 +1639,7 @@ dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; - len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries); + len = sysfs_emit(buf, "%lu\n", device->default_retries); dasd_put_device(device); return len; } @@ -1316,7 +1680,7 @@ dasd_timeout_show(struct device *dev, struct device_attribute *attr, device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; - len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout); + len = sysfs_emit(buf, "%lu\n", device->blk_timeout); dasd_put_device(device); return len; } @@ -1326,7 +1690,6 @@ dasd_timeout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_device *device; - struct request_queue *q; unsigned long val; device = dasd_device_from_cdev(to_ccwdev(dev)); @@ -1338,15 +1701,13 @@ dasd_timeout_store(struct device *dev, struct device_attribute *attr, dasd_put_device(device); return -EINVAL; } - q = device->block->request_queue; - if (!q) { + if (!device->block->gdp) { dasd_put_device(device); return -ENODEV; } device->blk_timeout = val; - - blk_queue_rq_timeout(q, device->blk_timeout * HZ); + blk_queue_rq_timeout(device->block->gdp->queue, val * HZ); dasd_put_device(device); return count; @@ -1390,11 +1751,11 @@ static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, return -ENODEV; if (!device->discipline || !device->discipline->hpf_enabled) { dasd_put_device(device); - return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx); + return sysfs_emit(buf, "%d\n", dasd_nofcx); } hpf = device->discipline->hpf_enabled(device); dasd_put_device(device); - return snprintf(buf, PAGE_SIZE, "%d\n", hpf); + return sysfs_emit(buf, "%d\n", hpf); } static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); @@ -1408,13 +1769,13 @@ static ssize_t dasd_reservation_policy_show(struct device *dev, devmap = dasd_find_busid(dev_name(dev)); if (IS_ERR(devmap)) { - rc = snprintf(buf, PAGE_SIZE, "ignore\n"); + rc = sysfs_emit(buf, "ignore\n"); } else { spin_lock(&dasd_devmap_lock); if (devmap->features & DASD_FEATURE_FAILONSLCK) - rc = snprintf(buf, PAGE_SIZE, "fail\n"); + rc = sysfs_emit(buf, "fail\n"); else - rc = snprintf(buf, PAGE_SIZE, "ignore\n"); + rc = sysfs_emit(buf, "ignore\n"); spin_unlock(&dasd_devmap_lock); } return rc; @@ -1449,14 +1810,14 @@ static ssize_t dasd_reservation_state_show(struct device *dev, device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) - return snprintf(buf, PAGE_SIZE, "none\n"); + return sysfs_emit(buf, "none\n"); if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) - rc = snprintf(buf, PAGE_SIZE, "reserved\n"); + rc = sysfs_emit(buf, "reserved\n"); else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) - rc = snprintf(buf, PAGE_SIZE, "lost\n"); + rc = sysfs_emit(buf, "lost\n"); else - rc = snprintf(buf, PAGE_SIZE, "none\n"); + rc = sysfs_emit(buf, "none\n"); dasd_put_device(device); return rc; } @@ -1494,7 +1855,7 @@ static ssize_t dasd_pm_show(struct device *dev, device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) - return sprintf(buf, "0\n"); + return sysfs_emit(buf, "0\n"); opm = dasd_path_get_opm(device); nppm = dasd_path_get_nppm(device); @@ -1504,8 +1865,8 @@ static ssize_t dasd_pm_show(struct device *dev, 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); + return sysfs_emit(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, + cablepm, cuirpm, hpfpm, ifccpm); } static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); @@ -1523,7 +1884,7 @@ dasd_path_threshold_show(struct device *dev, device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; - len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld); + len = sysfs_emit(buf, "%lu\n", device->path_thrhld); dasd_put_device(device); return len; } @@ -1570,7 +1931,7 @@ dasd_path_autodisable_show(struct device *dev, else flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_PATH_AUTODISABLE) != 0; - return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n"); + return sysfs_emit(buf, flag ? "1\n" : "0\n"); } static ssize_t @@ -1608,7 +1969,7 @@ dasd_path_interval_show(struct device *dev, device = dasd_device_from_cdev(to_ccwdev(dev)); if (IS_ERR(device)) return -ENODEV; - len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval); + len = sysfs_emit(buf, "%lu\n", device->path_interval); dasd_put_device(device); return len; } @@ -1641,6 +2002,386 @@ dasd_path_interval_store(struct device *dev, struct device_attribute *attr, 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); + if (IS_ERR(prim_devmap)) + return PTR_ERR(prim_devmap); + } + + /* 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); + if (IS_ERR(sec_devmap)) + return PTR_ERR(sec_devmap); + } + + /* 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, \ @@ -1657,7 +2398,7 @@ static ssize_t dasd_##_name##_show(struct device *dev, \ val = _func(device); \ dasd_put_device(device); \ \ - return snprintf(buf, PAGE_SIZE, "%d\n", val); \ + return sysfs_emit(buf, "%d\n", val); \ } \ static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \ @@ -1697,6 +2438,13 @@ static struct attribute * dasd_attrs[] = { &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, + &dev_attr_aq_mask.attr, + &dev_attr_aq_requeue.attr, + &dev_attr_aq_timeouts.attr, NULL, }; @@ -1730,12 +2478,13 @@ static const struct attribute_group ext_pool_attr_group = { .attrs = ext_pool_attrs, }; -static const struct attribute_group *dasd_attr_groups[] = { +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. @@ -1777,18 +2526,82 @@ dasd_set_feature(struct ccw_device *cdev, int feature, int flag) } 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, +}; -int dasd_add_sysfs_files(struct ccw_device *cdev) +static void dasd_path_init_kobj(struct dasd_device *device, int chp) { - return sysfs_create_groups(&cdev->dev.kobj, dasd_attr_groups); + device->path[chp].kobj.kset = device->paths_info; + kobject_init(&device->path[chp].kobj, &path_attr_type); } -void -dasd_remove_sysfs_files(struct ccw_device *cdev) +void dasd_path_create_kobj(struct dasd_device *device, int chp) { - sysfs_remove_groups(&cdev->dev.kobj, dasd_attr_groups); + 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) |