diff options
Diffstat (limited to 'kernel/drivers/s390/block/dasd_devmap.c')
| -rw-r--r-- | kernel/drivers/s390/block/dasd_devmap.c | 1553 |
1 files changed, 1553 insertions, 0 deletions
diff --git a/kernel/drivers/s390/block/dasd_devmap.c b/kernel/drivers/s390/block/dasd_devmap.c new file mode 100644 index 000000000..8286f7424 --- /dev/null +++ b/kernel/drivers/s390/block/dasd_devmap.c @@ -0,0 +1,1553 @@ +/* + * 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 <asm/uaccess.h> +#include <asm/ipl.h> + +/* This is ugly... */ +#define PRINTK_HEADER "dasd_devmap:" +#define DASD_BUS_ID_SIZE 20 + +#include "dasd_int.h" + +struct kmem_cache *dasd_page_cache; +EXPORT_SYMBOL_GPL(dasd_page_cache); + +/* + * dasd_devmap_t is used to store the features and the relation + * between device number and device index. To find a dasd_devmap_t + * that corresponds to a device number of a device index each + * dasd_devmap_t is added to two linked lists, one to search by + * the device number and one to search by the device index. As + * soon as big minor numbers are available the device index list + * can be removed since the device number will then be identical + * to the device index. + */ +struct dasd_devmap { + struct list_head list; + char bus_id[DASD_BUS_ID_SIZE]; + unsigned int devindex; + unsigned short features; + struct dasd_device *device; +}; + +/* + * Parameter parsing functions for dasd= parameter. The syntax is: + * <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[256]; +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 +/* + * The parameter parsing functions for builtin-drivers are called + * before kmalloc works. Store the pointers to the parameters strings + * into dasd[] for later processing. + */ +static int __init +dasd_call_setup(char *str) +{ + static int count = 0; + + if (count < 256) + dasd[count++] = str; + 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) +{ + int val, old_style; + + /* 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; + *str += strlen(DASD_IPLDEV); + + return 0; + } + /* check for leading '0x' */ + old_style = 0; + if ((*str)[0] == '0' && (*str)[1] == 'x') { + *str += 2; + old_style = 1; + } + if (!isxdigit((*str)[0])) /* We require at least one hex digit */ + return -EINVAL; + val = simple_strtoul(*str, str, 16); + if (old_style || (*str)[0] != '.') { + *id0 = *id1 = 0; + if (val < 0 || val > 0xffff) + return -EINVAL; + *devno = val; + return 0; + } + /* New style x.y.z busid */ + if (val < 0 || val > 0xff) + return -EINVAL; + *id0 = val; + (*str)++; + if (!isxdigit((*str)[0])) /* We require at least one hex digit */ + return -EINVAL; + val = simple_strtoul(*str, str, 16); + if (val < 0 || val > 0xff || (*str)++[0] != '.') + return -EINVAL; + *id1 = val; + if (!isxdigit((*str)[0])) /* We require at least one hex digit */ + return -EINVAL; + val = simple_strtoul(*str, str, 16); + if (val < 0 || val > 0xffff) + return -EINVAL; + *devno = val; + return 0; +} + +/* + * Read colon separated list of dasd features. Currently there is + * only one: "ro" for read-only devices. The default feature set + * is empty (value 0). + */ +static int +dasd_feature_list(char *str, char **endp) +{ + int features, len, rc; + + rc = 0; + if (*str != '(') { + *endp = str; + return DASD_FEATURE_DEFAULT; + } + str++; + features = 0; + + 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_warning("%*s is not a supported device option\n", + len, str); + rc = -EINVAL; + } + str += len; + if (*str != ':') + break; + str++; + } + if (*str != ')') { + pr_warning("A closing parenthesis ')' is missing in the " + "dasd= parameter\n"); + rc = -EINVAL; + } else + str++; + *endp = str; + if (rc != 0) + return rc; + return 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 char * +dasd_parse_keyword( char *parsestring ) { + + char *nextcomma, *residual_str; + int length; + + nextcomma = strchr(parsestring,','); + if (nextcomma) { + length = nextcomma - parsestring; + residual_str = nextcomma + 1; + } else { + length = strlen(parsestring); + residual_str = parsestring + length; + } + if (strncmp("autodetect", parsestring, length) == 0) { + dasd_autodetect = 1; + pr_info("The autodetection mode has been activated\n"); + return residual_str; + } + if (strncmp("probeonly", parsestring, length) == 0) { + dasd_probeonly = 1; + pr_info("The probeonly mode has been activated\n"); + return residual_str; + } + if (strncmp("nopav", parsestring, 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 residual_str; + } + if (strncmp("nofcx", parsestring, length) == 0) { + dasd_nofcx = 1; + pr_info("High Performance FICON support has been " + "deactivated\n"); + return residual_str; + } + if (strncmp("fixedbuffers", parsestring, length) == 0) { + if (dasd_page_cache) + return residual_str; + 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 residual_str; + } + return ERR_PTR(-EINVAL); +} + +/* + * Try to interprete the first element on the comma separated parse string + * as a device number or a range of devices. If the interpretation is + * successful, create the matching dasd_devmap entries and return a pointer + * to the residual string. + * If interpretation fails or in case of an error, return an error code. + */ +static char * +dasd_parse_range( char *parsestring ) { + + struct dasd_devmap *devmap; + int from, from_id0, from_id1; + int to, to_id0, to_id1; + int features, rc; + char bus_id[DASD_BUS_ID_SIZE+1], *str; + + str = parsestring; + rc = dasd_busid(&str, &from_id0, &from_id1, &from); + if (rc == 0) { + to = from; + to_id0 = from_id0; + to_id1 = from_id1; + if (*str == '-') { + str++; + rc = dasd_busid(&str, &to_id0, &to_id1, &to); + } + } + if (rc == 0 && + (from_id0 != to_id0 || from_id1 != to_id1 || from > to)) + rc = -EINVAL; + if (rc) { + pr_err("%s is not a valid device range\n", parsestring); + return ERR_PTR(rc); + } + features = dasd_feature_list(str, &str); + if (features < 0) + return ERR_PTR(-EINVAL); + /* each device in dasd= parameter should be set initially online */ + features |= DASD_FEATURE_INITIAL_ONLINE; + while (from <= to) { + sprintf(bus_id, "%01x.%01x.%04x", + from_id0, from_id1, from++); + devmap = dasd_add_busid(bus_id, features); + if (IS_ERR(devmap)) + return (char *)devmap; + } + if (*str == ',') + return str + 1; + if (*str == '\0') + return str; + pr_warning("The dasd= parameter value %s has an invalid ending\n", + str); + return ERR_PTR(-EINVAL); +} + +static char * +dasd_parse_next_element( char *parsestring ) { + char * residual_str; + residual_str = dasd_parse_keyword(parsestring); + if (!IS_ERR(residual_str)) + return residual_str; + residual_str = dasd_parse_range(parsestring); + return residual_str; +} + +/* + * Parse parameters stored in dasd[] + * The 'dasd=...' parameter allows to specify a comma separated list of + * keywords and device ranges. When the dasd driver is build into the kernel, + * the complete list will be stored as one element of the dasd[] array. + * When the dasd driver is build as a module, then the list is broken into + * it's elements and each dasd[] entry contains one element. + */ +int +dasd_parse(void) +{ + int rc, i; + char *parsestring; + + rc = 0; + for (i = 0; i < 256; i++) { + if (dasd[i] == NULL) + break; + parsestring = dasd[i]; + /* loop over the comma separated list in the parsestring */ + while (*parsestring) { + parsestring = dasd_parse_next_element(parsestring); + if(IS_ERR(parsestring)) { + rc = PTR_ERR(parsestring); + break; + } + } + if (rc) { + DBF_EVENT(DBF_ALERT, "%s", "invalid range found"); + break; + } + } + return rc; +} + +/* + * Add a devmap for the device specified by busid. It is possible that + * the devmap already exists (dasd= parameter). The order of the devices + * added through this function will define the kdevs for the individual + * devices. + */ +static struct dasd_devmap * +dasd_add_busid(const char *bus_id, int features) +{ + struct dasd_devmap *devmap, *new, *tmp; + int hash; + + new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); + if (!new) + return ERR_PTR(-ENOMEM); + spin_lock(&dasd_devmap_lock); + devmap = NULL; + hash = dasd_hash_busid(bus_id); + list_for_each_entry(tmp, &dasd_hashlists[hash], list) + if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { + devmap = tmp; + break; + } + if (!devmap) { + /* This bus_id is new. */ + new->devindex = dasd_max_devindex++; + strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); + new->features = features; + new->device = NULL; + list_add(&new->list, &dasd_hashlists[hash]); + devmap = new; + new = NULL; + } + spin_unlock(&dasd_devmap_lock); + kfree(new); + return devmap; +} + +/* + * Find devmap for device with given bus_id. + */ +static struct dasd_devmap * +dasd_find_busid(const char *bus_id) +{ + struct dasd_devmap *devmap, *tmp; + int hash; + + spin_lock(&dasd_devmap_lock); + devmap = ERR_PTR(-ENODEV); + hash = dasd_hash_busid(bus_id); + list_for_each_entry(tmp, &dasd_hashlists[hash], list) { + if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { + devmap = tmp; + break; + } + } + spin_unlock(&dasd_devmap_lock); + return devmap; +} + +/* + * Check if busid has been added to the list of dasd ranges. + */ +int +dasd_busid_known(const char *bus_id) +{ + return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; +} + +/* + * Forget all about the device numbers added so far. + * This may only be called at module unload or system shutdown. + */ +static void +dasd_forget_ranges(void) +{ + struct dasd_devmap *devmap, *n; + int i; + + spin_lock(&dasd_devmap_lock); + for (i = 0; i < 256; i++) { + list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { + BUG_ON(devmap->device != NULL); + list_del(&devmap->list); + kfree(devmap); + } + } + spin_unlock(&dasd_devmap_lock); +} + +/* + * Find the device struct by its device index. + */ +struct dasd_device * +dasd_device_from_devindex(int devindex) +{ + struct dasd_devmap *devmap, *tmp; + struct dasd_device *device; + int i; + + spin_lock(&dasd_devmap_lock); + devmap = NULL; + for (i = 0; (i < 256) && !devmap; i++) + list_for_each_entry(tmp, &dasd_hashlists[i], list) + if (tmp->devindex == devindex) { + /* Found the devmap for the device. */ + devmap = tmp; + break; + } + if (devmap && devmap->device) { + device = devmap->device; + dasd_get_device(device); + } else + device = ERR_PTR(-ENODEV); + spin_unlock(&dasd_devmap_lock); + return device; +} + +/* + * Return devmap for cdev. If no devmap exists yet, create one and + * connect it to the cdev. + */ +static struct dasd_devmap * +dasd_devmap_from_cdev(struct ccw_device *cdev) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&cdev->dev)); + if (IS_ERR(devmap)) + devmap = dasd_add_busid(dev_name(&cdev->dev), + DASD_FEATURE_DEFAULT); + return devmap; +} + +/* + * Create a dasd device structure for cdev. + */ +struct dasd_device * +dasd_create_device(struct ccw_device *cdev) +{ + struct dasd_devmap *devmap; + struct dasd_device *device; + unsigned long flags; + int rc; + + devmap = dasd_devmap_from_cdev(cdev); + if (IS_ERR(devmap)) + return (void *) devmap; + + device = dasd_alloc_device(); + if (IS_ERR(device)) + return device; + atomic_set(&device->ref_count, 3); + + spin_lock(&dasd_devmap_lock); + if (!devmap->device) { + devmap->device = device; + device->devindex = devmap->devindex; + device->features = devmap->features; + get_device(&cdev->dev); + device->cdev = cdev; + rc = 0; + } else + /* Someone else was faster. */ + rc = -EBUSY; + spin_unlock(&dasd_devmap_lock); + + if (rc) { + dasd_free_device(device); + return ERR_PTR(rc); + } + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + dev_set_drvdata(&cdev->dev, device); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + return device; +} + +/* + * Wait queue for dasd_delete_device waits. + */ +static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); + +/* + * Remove a dasd device structure. The passed referenced + * is destroyed. + */ +void +dasd_delete_device(struct dasd_device *device) +{ + struct ccw_device *cdev; + struct dasd_devmap *devmap; + unsigned long flags; + + /* First remove device pointer from devmap. */ + devmap = dasd_find_busid(dev_name(&device->cdev->dev)); + BUG_ON(IS_ERR(devmap)); + spin_lock(&dasd_devmap_lock); + if (devmap->device != device) { + spin_unlock(&dasd_devmap_lock); + dasd_put_device(device); + return; + } + devmap->device = NULL; + spin_unlock(&dasd_devmap_lock); + + /* Disconnect dasd_device structure from ccw_device structure. */ + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); + dev_set_drvdata(&device->cdev->dev, NULL); + spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + + /* + * Drop ref_count by 3, one for the devmap reference, one for + * the cdev reference and one for the passed reference. + */ + atomic_sub(3, &device->ref_count); + + /* Wait for reference counter to drop to zero. */ + wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); + + /* Disconnect dasd_device structure from ccw_device structure. */ + cdev = device->cdev; + device->cdev = NULL; + + /* Put ccw_device structure. */ + put_device(&cdev->dev); + + /* Now the device structure can be freed. */ + dasd_free_device(device); +} + +/* + * Reference counter dropped to zero. Wake up waiter + * in dasd_delete_device. + */ +void +dasd_put_device_wake(struct dasd_device *device) +{ + wake_up(&dasd_delete_wq); +} +EXPORT_SYMBOL_GPL(dasd_put_device_wake); + +/* + * Return dasd_device structure associated with cdev. + * This function needs to be called with the ccw device + * lock held. It can be used from interrupt context. + */ +struct dasd_device * +dasd_device_from_cdev_locked(struct ccw_device *cdev) +{ + struct dasd_device *device = dev_get_drvdata(&cdev->dev); + + if (!device) + return ERR_PTR(-ENODEV); + dasd_get_device(device); + return device; +} + +/* + * Return dasd_device structure associated with cdev. + */ +struct dasd_device * +dasd_device_from_cdev(struct ccw_device *cdev) +{ + struct dasd_device *device; + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + device = dasd_device_from_cdev_locked(cdev); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + return device; +} + +void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&device->cdev->dev)); + if (IS_ERR(devmap)) + return; + spin_lock(&dasd_devmap_lock); + gdp->private_data = devmap; + spin_unlock(&dasd_devmap_lock); +} + +struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) +{ + struct dasd_device *device; + struct dasd_devmap *devmap; + + if (!gdp->private_data) + return NULL; + device = NULL; + spin_lock(&dasd_devmap_lock); + devmap = gdp->private_data; + if (devmap && devmap->device) { + device = devmap->device; + dasd_get_device(device); + } + spin_unlock(&dasd_devmap_lock); + return device; +} + +/* + * SECTION: files in sysfs + */ + +/* + * failfast controls the behaviour, if no path is available + */ +static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_devmap *devmap; + int ff_flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; + else + ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; + return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n"); +} + +static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + int val; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + if (val) + devmap->features |= DASD_FEATURE_FAILFAST; + else + devmap->features &= ~DASD_FEATURE_FAILFAST; + if (devmap->device) + devmap->device->features = devmap->features; + spin_unlock(&dasd_devmap_lock); + return count; +} + +static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); + +/* + * readonly controls the readonly status of a dasd + */ +static ssize_t +dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int ro_flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; + else + ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; + return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_ro_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + struct dasd_device *device; + int val; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + if (val) + devmap->features |= DASD_FEATURE_READONLY; + else + devmap->features &= ~DASD_FEATURE_READONLY; + device = devmap->device; + if (device) { + device->features = devmap->features; + val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); + } + spin_unlock(&dasd_devmap_lock); + if (device && device->block && device->block->gdp) + set_disk_ro(device->block->gdp, val); + return count; +} + +static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); +/* + * erplog controls the logging of ERP related data + * (e.g. failing channel programs). + */ +static ssize_t +dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int erplog; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; + else + erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; + return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); +} + +static ssize_t +dasd_erplog_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + int val; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + if (val) + devmap->features |= DASD_FEATURE_ERPLOG; + else + devmap->features &= ~DASD_FEATURE_ERPLOG; + if (devmap->device) + devmap->device->features = devmap->features; + spin_unlock(&dasd_devmap_lock); + return 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; + ssize_t rc; + int val; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + /* Changing diag discipline flag is only allowed in offline state. */ + rc = count; + if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) { + if (val) + devmap->features |= DASD_FEATURE_USEDIAG; + else + devmap->features &= ~DASD_FEATURE_USEDIAG; + } else + rc = -EPERM; + spin_unlock(&dasd_devmap_lock); + return rc; +} + +static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); + +/* + * use_raw controls whether the driver should give access to raw eckd data or + * operate in standard mode + */ +static ssize_t +dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int use_raw; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap)) + use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0; + else + use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0; + return sprintf(buf, use_raw ? "1\n" : "0\n"); +} + +static ssize_t +dasd_use_raw_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + ssize_t rc; + unsigned long val; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + if ((kstrtoul(buf, 10, &val) != 0) || val > 1) + return -EINVAL; + + spin_lock(&dasd_devmap_lock); + /* Changing diag discipline flag is only allowed in offline state. */ + rc = count; + if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) { + if (val) + devmap->features |= DASD_FEATURE_USERAW; + else + devmap->features &= ~DASD_FEATURE_USERAW; + } else + rc = -EPERM; + spin_unlock(&dasd_devmap_lock); + return rc; +} + +static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show, + dasd_use_raw_store); + +static ssize_t +dasd_safe_offline_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ccw_device *cdev = to_ccwdev(dev); + struct dasd_device *device; + int rc; + + device = dasd_device_from_cdev(cdev); + if (IS_ERR(device)) { + rc = PTR_ERR(device); + goto out; + } + + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || + test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { + /* Already doing offline processing */ + dasd_put_device(device); + rc = -EBUSY; + goto out; + } + + set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); + dasd_put_device(device); + + rc = ccw_device_set_offline(cdev); + +out: + return rc ? rc : count; +} + +static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store); + +static ssize_t +dasd_discipline_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + ssize_t len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + goto out; + else if (!device->discipline) { + dasd_put_device(device); + goto out; + } else { + len = snprintf(buf, PAGE_SIZE, "%s\n", + device->discipline->name); + dasd_put_device(device); + return len; + } +out: + len = snprintf(buf, PAGE_SIZE, "none\n"); + return len; +} + +static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); + +static ssize_t +dasd_device_status_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + ssize_t len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (!IS_ERR(device)) { + switch (device->state) { + case DASD_STATE_NEW: + len = snprintf(buf, PAGE_SIZE, "new\n"); + break; + case DASD_STATE_KNOWN: + len = snprintf(buf, PAGE_SIZE, "detected\n"); + break; + case DASD_STATE_BASIC: + len = snprintf(buf, PAGE_SIZE, "basic\n"); + break; + case DASD_STATE_UNFMT: + len = snprintf(buf, PAGE_SIZE, "unformatted\n"); + break; + case DASD_STATE_READY: + len = snprintf(buf, PAGE_SIZE, "ready\n"); + break; + case DASD_STATE_ONLINE: + len = snprintf(buf, PAGE_SIZE, "online\n"); + break; + default: + len = snprintf(buf, PAGE_SIZE, "no stat\n"); + break; + } + dasd_put_device(device); + } else + len = snprintf(buf, PAGE_SIZE, "unknown\n"); + return len; +} + +static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); + +static ssize_t dasd_alias_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + struct dasd_uid uid; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return sprintf(buf, "0\n"); + + if (device->discipline && device->discipline->get_uid && + !device->discipline->get_uid(device, &uid)) { + if (uid.type == UA_BASE_PAV_ALIAS || + uid.type == UA_HYPER_PAV_ALIAS) { + dasd_put_device(device); + return sprintf(buf, "1\n"); + } + } + dasd_put_device(device); + + return sprintf(buf, "0\n"); +} + +static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); + +static ssize_t dasd_vendor_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + struct dasd_uid uid; + char *vendor; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + vendor = ""; + if (IS_ERR(device)) + return snprintf(buf, PAGE_SIZE, "%s\n", vendor); + + if (device->discipline && device->discipline->get_uid && + !device->discipline->get_uid(device, &uid)) + vendor = uid.vendor; + + dasd_put_device(device); + + return snprintf(buf, PAGE_SIZE, "%s\n", vendor); +} + +static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); + +#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ + /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\ + /* vduit */ 32 + 1) + +static ssize_t +dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + struct dasd_uid uid; + char uid_string[UID_STRLEN]; + char ua_string[3]; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + uid_string[0] = 0; + if (IS_ERR(device)) + return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); + + if (device->discipline && device->discipline->get_uid && + !device->discipline->get_uid(device, &uid)) { + switch (uid.type) { + case UA_BASE_DEVICE: + snprintf(ua_string, sizeof(ua_string), "%02x", + uid.real_unit_addr); + break; + case UA_BASE_PAV_ALIAS: + snprintf(ua_string, sizeof(ua_string), "%02x", + uid.base_unit_addr); + break; + case UA_HYPER_PAV_ALIAS: + snprintf(ua_string, sizeof(ua_string), "xx"); + break; + default: + /* should not happen, treat like base device */ + snprintf(ua_string, sizeof(ua_string), "%02x", + uid.real_unit_addr); + break; + } + + if (strlen(uid.vduit) > 0) + snprintf(uid_string, sizeof(uid_string), + "%s.%s.%04x.%s.%s", + uid.vendor, uid.serial, uid.ssid, ua_string, + uid.vduit); + else + snprintf(uid_string, sizeof(uid_string), + "%s.%s.%04x.%s", + uid.vendor, uid.serial, uid.ssid, ua_string); + } + dasd_put_device(device); + + return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); +} +static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); + +/* + * extended error-reporting + */ +static ssize_t +dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_devmap *devmap; + int eer_flag; + + devmap = dasd_find_busid(dev_name(dev)); + if (!IS_ERR(devmap) && devmap->device) + eer_flag = dasd_eer_enabled(devmap->device); + else + eer_flag = 0; + return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); +} + +static ssize_t +dasd_eer_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + int val, rc; + char *endp; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + if (!devmap->device) + return -ENODEV; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + if (val) { + rc = dasd_eer_enable(devmap->device); + if (rc) + return rc; + } else + dasd_eer_disable(devmap->device); + return count; +} + +static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); + +/* + * expiration time for default requests + */ +static ssize_t +dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_expires_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + (val > DASD_EXPIRES_MAX) || val == 0) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->default_expires = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); + +static ssize_t +dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_retries_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + unsigned long val; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + (val > DASD_RETRIES_MAX)) { + dasd_put_device(device); + return -EINVAL; + } + + if (val) + device->default_retries = val; + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); + +static ssize_t +dasd_timeout_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + int len; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout); + dasd_put_device(device); + return len; +} + +static ssize_t +dasd_timeout_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + struct request_queue *q; + unsigned long val, flags; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device) || !device->block) + return -ENODEV; + + if ((kstrtoul(buf, 10, &val) != 0) || + val > UINT_MAX / HZ) { + dasd_put_device(device); + return -EINVAL; + } + q = device->block->request_queue; + if (!q) { + dasd_put_device(device); + return -ENODEV; + } + spin_lock_irqsave(&device->block->request_queue_lock, flags); + if (!val) + blk_queue_rq_timed_out(q, NULL); + else + blk_queue_rq_timed_out(q, dasd_times_out); + + device->blk_timeout = val; + + blk_queue_rq_timeout(q, device->blk_timeout * HZ); + spin_unlock_irqrestore(&device->block->request_queue_lock, flags); + + dasd_put_device(device); + return count; +} + +static DEVICE_ATTR(timeout, 0644, + dasd_timeout_show, dasd_timeout_store); + +static ssize_t dasd_reservation_policy_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dasd_devmap *devmap; + int rc = 0; + + devmap = dasd_find_busid(dev_name(dev)); + if (IS_ERR(devmap)) { + rc = snprintf(buf, PAGE_SIZE, "ignore\n"); + } else { + spin_lock(&dasd_devmap_lock); + if (devmap->features & DASD_FEATURE_FAILONSLCK) + rc = snprintf(buf, PAGE_SIZE, "fail\n"); + else + rc = snprintf(buf, PAGE_SIZE, "ignore\n"); + spin_unlock(&dasd_devmap_lock); + } + return rc; +} + +static ssize_t dasd_reservation_policy_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_devmap *devmap; + int rc; + + devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + rc = 0; + spin_lock(&dasd_devmap_lock); + if (sysfs_streq("ignore", buf)) + devmap->features &= ~DASD_FEATURE_FAILONSLCK; + else if (sysfs_streq("fail", buf)) + devmap->features |= DASD_FEATURE_FAILONSLCK; + else + rc = -EINVAL; + if (devmap->device) + devmap->device->features = devmap->features; + spin_unlock(&dasd_devmap_lock); + if (rc) + return rc; + else + return count; +} + +static DEVICE_ATTR(reservation_policy, 0644, + dasd_reservation_policy_show, dasd_reservation_policy_store); + +static ssize_t dasd_reservation_state_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dasd_device *device; + int rc = 0; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return snprintf(buf, PAGE_SIZE, "none\n"); + + if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) + rc = snprintf(buf, PAGE_SIZE, "reserved\n"); + else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) + rc = snprintf(buf, PAGE_SIZE, "lost\n"); + else + rc = snprintf(buf, PAGE_SIZE, "none\n"); + dasd_put_device(device); + return rc; +} + +static ssize_t dasd_reservation_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dasd_device *device; + int rc = 0; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return -ENODEV; + if (sysfs_streq("reset", buf)) + clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); + else + rc = -EINVAL; + dasd_put_device(device); + + if (rc) + return rc; + else + return count; +} + +static DEVICE_ATTR(last_known_reservation_state, 0644, + dasd_reservation_state_show, dasd_reservation_state_store); + +static ssize_t dasd_pm_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dasd_device *device; + u8 opm, nppm, cablepm, cuirpm, hpfpm; + + device = dasd_device_from_cdev(to_ccwdev(dev)); + if (IS_ERR(device)) + return sprintf(buf, "0\n"); + + opm = device->path_data.opm; + nppm = device->path_data.npm; + cablepm = device->path_data.cablepm; + cuirpm = device->path_data.cuirpm; + hpfpm = device->path_data.hpfpm; + dasd_put_device(device); + + return sprintf(buf, "%02x %02x %02x %02x %02x\n", opm, nppm, + cablepm, cuirpm, hpfpm); +} + +static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); + +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_path_masks.attr, + NULL, +}; + +static struct attribute_group dasd_attr_group = { + .attrs = dasd_attrs, +}; + +/* + * Return value of the specified feature. + */ +int +dasd_get_feature(struct ccw_device *cdev, int feature) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&cdev->dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + return ((devmap->features & feature) != 0); +} + +/* + * Set / reset given feature. + * Flag indicates whether to set (!=0) or the reset (=0) the feature. + */ +int +dasd_set_feature(struct ccw_device *cdev, int feature, int flag) +{ + struct dasd_devmap *devmap; + + devmap = dasd_find_busid(dev_name(&cdev->dev)); + if (IS_ERR(devmap)) + return PTR_ERR(devmap); + + spin_lock(&dasd_devmap_lock); + if (flag) + devmap->features |= feature; + else + devmap->features &= ~feature; + if (devmap->device) + devmap->device->features = devmap->features; + spin_unlock(&dasd_devmap_lock); + return 0; +} + + +int +dasd_add_sysfs_files(struct ccw_device *cdev) +{ + return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); +} + +void +dasd_remove_sysfs_files(struct ccw_device *cdev) +{ + sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); +} + + +int +dasd_devmap_init(void) +{ + int i; + + /* Initialize devmap structures. */ + dasd_max_devindex = 0; + for (i = 0; i < 256; i++) + INIT_LIST_HEAD(&dasd_hashlists[i]); + return 0; +} + +void +dasd_devmap_exit(void) +{ + dasd_forget_ranges(); +} |