| /* |
| * File...........: linux/drivers/s390/block/dasd_devmap.c |
| * 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> |
| * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 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. |
| * |
| */ |
| |
| #include <linux/ctype.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| |
| #include <asm/debug.h> |
| #include <asm/uaccess.h> |
| |
| /* This is ugly... */ |
| #define PRINTK_HEADER "dasd_devmap:" |
| |
| #include "dasd_int.h" |
| |
| kmem_cache_t *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[BUS_ID_SIZE]; |
| unsigned int devindex; |
| unsigned short features; |
| struct dasd_device *device; |
| struct dasd_uid uid; |
| }; |
| |
| /* |
| * dasd_servermap is used to store the server_id of all storage servers |
| * accessed by DASD device driver. |
| */ |
| struct dasd_servermap { |
| struct list_head list; |
| struct server_id { |
| char vendor[4]; |
| char serial[15]; |
| } sid; |
| }; |
| |
| static struct list_head dasd_serverlist; |
| |
| /* |
| * 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); |
| |
| /* |
| * 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, 0); |
| |
| /* |
| * Single spinlock to protect devmap 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(char *, int); |
| |
| static inline int |
| dasd_hash_busid(char *bus_id) |
| { |
| int hash, i; |
| |
| hash = 0; |
| for (i = 0; (i < 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 */ |
| |
| /* |
| * Read a device busid/devno from a string. |
| */ |
| static inline int |
| dasd_busid(char **str, int *id0, int *id1, int *devno) |
| { |
| int val, old_style; |
| |
| /* 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 inline 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 { |
| MESSAGE(KERN_WARNING, |
| "unsupported feature: %*s, " |
| "ignoring setting", len, str); |
| rc = -EINVAL; |
| } |
| str += len; |
| if (*str != ':') |
| break; |
| str++; |
| } |
| if (*str != ')') { |
| MESSAGE(KERN_WARNING, "%s", |
| "missing ')' in dasd parameter string\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; |
| MESSAGE (KERN_INFO, "%s", |
| "turning to autodetection mode"); |
| return residual_str; |
| } |
| if (strncmp("probeonly", parsestring, length) == 0) { |
| dasd_probeonly = 1; |
| MESSAGE(KERN_INFO, "%s", |
| "turning to probeonly mode"); |
| return residual_str; |
| } |
| if (strncmp("nopav", parsestring, length) == 0) { |
| dasd_nopav = 1; |
| MESSAGE(KERN_INFO, "%s", "disable PAV mode"); |
| 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, 0, |
| SLAB_CACHE_DMA, NULL, NULL ); |
| if (!dasd_page_cache) |
| MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " |
| "fixed buffer mode disabled."); |
| else |
| MESSAGE (KERN_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 |
| * successfull, 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[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) { |
| MESSAGE(KERN_ERR, "Invalid device range %s", 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; |
| MESSAGE(KERN_WARNING, |
| "junk at end of dasd parameter string: %s\n", str); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| static inline 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(char *bus_id, int features) |
| { |
| struct dasd_devmap *devmap, *new, *tmp; |
| int hash; |
| |
| new = (struct dasd_devmap *) |
| kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); |
| if (!new) |
| return ERR_PTR(-ENOMEM); |
| spin_lock(&dasd_devmap_lock); |
| devmap = 0; |
| hash = dasd_hash_busid(bus_id); |
| list_for_each_entry(tmp, &dasd_hashlists[hash], list) |
| if (strncmp(tmp->bus_id, bus_id, 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, BUS_ID_SIZE); |
| new->features = features; |
| new->device = 0; |
| list_add(&new->list, &dasd_hashlists[hash]); |
| devmap = new; |
| new = 0; |
| } |
| spin_unlock(&dasd_devmap_lock); |
| kfree(new); |
| return devmap; |
| } |
| |
| /* |
| * Find devmap for device with given bus_id. |
| */ |
| static struct dasd_devmap * |
| dasd_find_busid(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, 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(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 = 0; |
| 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(cdev->dev.bus_id); |
| if (IS_ERR(devmap)) |
| devmap = dasd_add_busid(cdev->dev.bus_id, |
| 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; |
| int rc; |
| |
| devmap = dasd_devmap_from_cdev(cdev); |
| if (IS_ERR(devmap)) |
| return (void *) devmap; |
| cdev->dev.driver_data = devmap; |
| |
| device = dasd_alloc_device(); |
| if (IS_ERR(device)) |
| return device; |
| atomic_set(&device->ref_count, 2); |
| |
| 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); |
| } |
| 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; |
| |
| /* First remove device pointer from devmap. */ |
| devmap = dasd_find_busid(device->cdev->dev.bus_id); |
| 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); |
| |
| /* Drop ref_count by 2, one for the devmap reference and |
| * one for the passed reference. */ |
| atomic_sub(2, &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; |
| |
| /* Disconnect dasd_devmap structure from ccw_device structure. */ |
| cdev->dev.driver_data = 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); |
| } |
| |
| /* |
| * Return dasd_device structure associated with cdev. |
| */ |
| struct dasd_device * |
| dasd_device_from_cdev(struct ccw_device *cdev) |
| { |
| struct dasd_devmap *devmap; |
| struct dasd_device *device; |
| |
| device = ERR_PTR(-ENODEV); |
| spin_lock(&dasd_devmap_lock); |
| devmap = cdev->dev.driver_data; |
| if (devmap && devmap->device) { |
| device = devmap->device; |
| dasd_get_device(device); |
| } |
| spin_unlock(&dasd_devmap_lock); |
| return device; |
| } |
| |
| /* |
| * SECTION: files in sysfs |
| */ |
| |
| /* |
| * 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->bus_id); |
| 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; |
| int ro_flag; |
| |
| devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| ro_flag = buf[0] == '1'; |
| spin_lock(&dasd_devmap_lock); |
| if (ro_flag) |
| devmap->features |= DASD_FEATURE_READONLY; |
| else |
| devmap->features &= ~DASD_FEATURE_READONLY; |
| if (devmap->device) |
| devmap->device->features = devmap->features; |
| if (devmap->device && devmap->device->gdp) |
| set_disk_ro(devmap->device->gdp, ro_flag); |
| spin_unlock(&dasd_devmap_lock); |
| return count; |
| } |
| |
| static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_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->bus_id); |
| 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 use_diag; |
| |
| devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| use_diag = buf[0] == '1'; |
| spin_lock(&dasd_devmap_lock); |
| /* Changing diag discipline flag is only allowed in offline state. */ |
| rc = count; |
| if (!devmap->device) { |
| if (use_diag) |
| 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); |
| |
| static ssize_t |
| dasd_discipline_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct dasd_devmap *devmap; |
| char *dname; |
| |
| spin_lock(&dasd_devmap_lock); |
| dname = "none"; |
| devmap = dev->driver_data; |
| if (devmap && devmap->device && devmap->device->discipline) |
| dname = devmap->device->discipline->name; |
| spin_unlock(&dasd_devmap_lock); |
| return snprintf(buf, PAGE_SIZE, "%s\n", dname); |
| } |
| |
| static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); |
| |
| static ssize_t |
| dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct dasd_devmap *devmap; |
| int alias; |
| |
| devmap = dasd_find_busid(dev->bus_id); |
| spin_lock(&dasd_devmap_lock); |
| if (!IS_ERR(devmap)) |
| alias = devmap->uid.alias; |
| else |
| alias = 0; |
| spin_unlock(&dasd_devmap_lock); |
| |
| return sprintf(buf, alias ? "1\n" : "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_devmap *devmap; |
| char *vendor; |
| |
| devmap = dasd_find_busid(dev->bus_id); |
| spin_lock(&dasd_devmap_lock); |
| if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) |
| vendor = devmap->uid.vendor; |
| else |
| vendor = ""; |
| spin_unlock(&dasd_devmap_lock); |
| |
| 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) |
| |
| static ssize_t |
| dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) |
| { |
| struct dasd_devmap *devmap; |
| char uid[UID_STRLEN]; |
| |
| devmap = dasd_find_busid(dev->bus_id); |
| spin_lock(&dasd_devmap_lock); |
| if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0) |
| snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x", |
| devmap->uid.vendor, devmap->uid.serial, |
| devmap->uid.ssid, devmap->uid.unit_addr); |
| else |
| uid[0] = 0; |
| spin_unlock(&dasd_devmap_lock); |
| |
| return snprintf(buf, PAGE_SIZE, "%s\n", uid); |
| } |
| |
| 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->bus_id); |
| 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 rc; |
| |
| devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| if (!devmap->device) |
| return count; |
| if (buf[0] == '1') { |
| 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); |
| |
| static struct attribute * dasd_attrs[] = { |
| &dev_attr_readonly.attr, |
| &dev_attr_discipline.attr, |
| &dev_attr_alias.attr, |
| &dev_attr_vendor.attr, |
| &dev_attr_uid.attr, |
| &dev_attr_use_diag.attr, |
| &dev_attr_eer_enabled.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group dasd_attr_group = { |
| .attrs = dasd_attrs, |
| }; |
| |
| /* |
| * Check if the related storage server is already contained in the |
| * dasd_serverlist. If server is not contained, create new entry. |
| * Return 0 if server was already in serverlist, |
| * 1 if the server was added successfully |
| * <0 in case of error. |
| */ |
| static int |
| dasd_add_server(struct dasd_uid *uid) |
| { |
| struct dasd_servermap *new, *tmp; |
| |
| /* check if server is already contained */ |
| list_for_each_entry(tmp, &dasd_serverlist, list) |
| // normale cmp? |
| if (strncmp(tmp->sid.vendor, uid->vendor, |
| sizeof(tmp->sid.vendor)) == 0 |
| && strncmp(tmp->sid.serial, uid->serial, |
| sizeof(tmp->sid.serial)) == 0) |
| return 0; |
| |
| new = (struct dasd_servermap *) |
| kzalloc(sizeof(struct dasd_servermap), GFP_KERNEL); |
| if (!new) |
| return -ENOMEM; |
| |
| strncpy(new->sid.vendor, uid->vendor, sizeof(new->sid.vendor)); |
| strncpy(new->sid.serial, uid->serial, sizeof(new->sid.serial)); |
| list_add(&new->list, &dasd_serverlist); |
| return 1; |
| } |
| |
| |
| /* |
| * Return copy of the device unique identifier. |
| */ |
| int |
| dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid) |
| { |
| struct dasd_devmap *devmap; |
| |
| devmap = dasd_find_busid(cdev->dev.bus_id); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| spin_lock(&dasd_devmap_lock); |
| *uid = devmap->uid; |
| spin_unlock(&dasd_devmap_lock); |
| return 0; |
| } |
| |
| /* |
| * Register the given device unique identifier into devmap struct. |
| * Return 0 if server was already in serverlist, |
| * 1 if the server was added successful |
| * <0 in case of error. |
| */ |
| int |
| dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid) |
| { |
| struct dasd_devmap *devmap; |
| int rc; |
| |
| devmap = dasd_find_busid(cdev->dev.bus_id); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| spin_lock(&dasd_devmap_lock); |
| devmap->uid = *uid; |
| rc = dasd_add_server(uid); |
| spin_unlock(&dasd_devmap_lock); |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(dasd_set_uid); |
| |
| /* |
| * Return value of the specified feature. |
| */ |
| int |
| dasd_get_feature(struct ccw_device *cdev, int feature) |
| { |
| struct dasd_devmap *devmap; |
| |
| devmap = dasd_find_busid(cdev->dev.bus_id); |
| if (IS_ERR(devmap)) |
| return PTR_ERR(devmap); |
| |
| return ((devmap->features & feature) != 0); |
| } |
| |
| /* |
| * Set / reset given feature. |
| * Flag indicates wether 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(cdev->dev.bus_id); |
| 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]); |
| |
| /* Initialize servermap structure. */ |
| INIT_LIST_HEAD(&dasd_serverlist); |
| return 0; |
| } |
| |
| void |
| dasd_devmap_exit(void) |
| { |
| dasd_forget_ranges(); |
| } |