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linux-zen-server/drivers/s390/block/dasd_devmap.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Horst Hummel <Horst.Hummel@de.ibm.com>
* Carsten Otte <Cotte@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* Copyright IBM Corp. 1999,2001
*
* Device mapping and dasd= parameter parsing functions. All devmap
* functions may not be called from interrupt context. In particular
* dasd_get_device is a no-no from interrupt context.
*
*/
#define KMSG_COMPONENT "dasd"
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/debug.h>
#include <linux/uaccess.h>
#include <asm/ipl.h>
/* This is ugly... */
#define PRINTK_HEADER "dasd_devmap:"
#define DASD_MAX_PARAMS 256
#include "dasd_int.h"
struct kmem_cache *dasd_page_cache;
EXPORT_SYMBOL_GPL(dasd_page_cache);
/*
* dasd_devmap_t is used to store the features and the relation
* between device number and device index. To find a dasd_devmap_t
* that corresponds to a device number of a device index each
* dasd_devmap_t is added to two linked lists, one to search by
* the device number and one to search by the device index. As
* soon as big minor numbers are available the device index list
* can be removed since the device number will then be identical
* to the device index.
*/
struct dasd_devmap {
struct list_head list;
char bus_id[DASD_BUS_ID_SIZE];
unsigned int devindex;
unsigned short features;
struct dasd_device *device;
struct dasd_copy_relation *copy;
};
/*
* Parameter parsing functions for dasd= parameter. The syntax is:
* <devno> : (0x)?[0-9a-fA-F]+
* <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
* <feature> : ro
* <feature_list> : \(<feature>(:<feature>)*\)
* <devno-range> : <devno>(-<devno>)?<feature_list>?
* <busid-range> : <busid>(-<busid>)?<feature_list>?
* <devices> : <devno-range>|<busid-range>
* <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
*
* <dasd> : autodetect|probeonly|<devices>(,<devices>)*
*/
int dasd_probeonly = 0; /* is true, when probeonly mode is active */
int dasd_autodetect = 0; /* is true, when autodetection is active */
int dasd_nopav = 0; /* is true, when PAV is disabled */
EXPORT_SYMBOL_GPL(dasd_nopav);
int dasd_nofcx; /* disable High Performance Ficon */
EXPORT_SYMBOL_GPL(dasd_nofcx);
/*
* char *dasd[] is intended to hold the ranges supplied by the dasd= statement
* it is named 'dasd' to directly be filled by insmod with the comma separated
* strings when running as a module.
*/
static char *dasd[DASD_MAX_PARAMS];
module_param_array(dasd, charp, NULL, S_IRUGO);
/*
* Single spinlock to protect devmap and servermap structures and lists.
*/
static DEFINE_SPINLOCK(dasd_devmap_lock);
/*
* Hash lists for devmap structures.
*/
static struct list_head dasd_hashlists[256];
int dasd_max_devindex;
static struct dasd_devmap *dasd_add_busid(const char *, int);
static inline int
dasd_hash_busid(const char *bus_id)
{
int hash, i;
hash = 0;
for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
hash += *bus_id;
return hash & 0xff;
}
#ifndef MODULE
static int __init dasd_call_setup(char *opt)
{
static int i __initdata;
char *tmp;
while (i < DASD_MAX_PARAMS) {
tmp = strsep(&opt, ",");
if (!tmp)
break;
dasd[i++] = tmp;
}
return 1;
}
__setup ("dasd=", dasd_call_setup);
#endif /* #ifndef MODULE */
#define DASD_IPLDEV "ipldev"
/*
* Read a device busid/devno from a string.
*/
static int dasd_busid(char *str, int *id0, int *id1, int *devno)
{
unsigned int val;
char *tok;
/* Interpret ipldev busid */
if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) {
if (ipl_info.type != IPL_TYPE_CCW) {
pr_err("The IPL device is not a CCW device\n");
return -EINVAL;
}
*id0 = 0;
*id1 = ipl_info.data.ccw.dev_id.ssid;
*devno = ipl_info.data.ccw.dev_id.devno;
return 0;
}
/* Old style 0xXXXX or XXXX */
if (!kstrtouint(str, 16, &val)) {
*id0 = *id1 = 0;
if (val > 0xffff)
return -EINVAL;
*devno = val;
return 0;
}
/* New style x.y.z busid */
tok = strsep(&str, ".");
if (kstrtouint(tok, 16, &val) || val > 0xff)
return -EINVAL;
*id0 = val;
tok = strsep(&str, ".");
if (kstrtouint(tok, 16, &val) || val > 0xff)
return -EINVAL;
*id1 = val;
tok = strsep(&str, ".");
if (kstrtouint(tok, 16, &val) || val > 0xffff)
return -EINVAL;
*devno = val;
return 0;
}
/*
* Read colon separated list of dasd features.
*/
static int __init dasd_feature_list(char *str)
{
int features, len, rc;
features = 0;
rc = 0;
if (!str)
return DASD_FEATURE_DEFAULT;
while (1) {
for (len = 0;
str[len] && str[len] != ':' && str[len] != ')'; len++);
if (len == 2 && !strncmp(str, "ro", 2))
features |= DASD_FEATURE_READONLY;
else if (len == 4 && !strncmp(str, "diag", 4))
features |= DASD_FEATURE_USEDIAG;
else if (len == 3 && !strncmp(str, "raw", 3))
features |= DASD_FEATURE_USERAW;
else if (len == 6 && !strncmp(str, "erplog", 6))
features |= DASD_FEATURE_ERPLOG;
else if (len == 8 && !strncmp(str, "failfast", 8))
features |= DASD_FEATURE_FAILFAST;
else {
pr_warn("%.*s is not a supported device option\n",
len, str);
rc = -EINVAL;
}
str += len;
if (*str != ':')
break;
str++;
}
return rc ? : features;
}
/*
* Try to match the first element on the comma separated parse string
* with one of the known keywords. If a keyword is found, take the approprate
* action and return a pointer to the residual string. If the first element
* could not be matched to any keyword then return an error code.
*/
static int __init dasd_parse_keyword(char *keyword)
{
int length = strlen(keyword);
if (strncmp("autodetect", keyword, length) == 0) {
dasd_autodetect = 1;
pr_info("The autodetection mode has been activated\n");
return 0;
}
if (strncmp("probeonly", keyword, length) == 0) {
dasd_probeonly = 1;
pr_info("The probeonly mode has been activated\n");
return 0;
}
if (strncmp("nopav", keyword, length) == 0) {
if (MACHINE_IS_VM)
pr_info("'nopav' is not supported on z/VM\n");
else {
dasd_nopav = 1;
pr_info("PAV support has be deactivated\n");
}
return 0;
}
if (strncmp("nofcx", keyword, length) == 0) {
dasd_nofcx = 1;
pr_info("High Performance FICON support has been "
"deactivated\n");
return 0;
}
if (strncmp("fixedbuffers", keyword, length) == 0) {
if (dasd_page_cache)
return 0;
dasd_page_cache =
kmem_cache_create("dasd_page_cache", PAGE_SIZE,
PAGE_SIZE, SLAB_CACHE_DMA,
NULL);
if (!dasd_page_cache)
DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
"fixed buffer mode disabled.");
else
DBF_EVENT(DBF_INFO, "%s",
"turning on fixed buffer mode");
return 0;
}
return -EINVAL;
}
/*
* Split a string of a device range into its pieces and return the from, to, and
* feature parts separately.
* e.g.:
* 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog
* 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw
* 0x4321 -> from: 0x4321 to: null features: null
*/
static int __init dasd_evaluate_range_param(char *range, char **from_str,
char **to_str, char **features_str)
{
int rc = 0;
/* Do we have a range or a single device? */
if (strchr(range, '-')) {
*from_str = strsep(&range, "-");
*to_str = strsep(&range, "(");
*features_str = strsep(&range, ")");
} else {
*from_str = strsep(&range, "(");
*features_str = strsep(&range, ")");
}
if (*features_str && !range) {
pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
rc = -EINVAL;
}
return rc;
}
/*
* Try to interprete the range string as a device number or a range of devices.
* If the interpretation is successful, create the matching dasd_devmap entries.
* If interpretation fails or in case of an error, return an error code.
*/
static int __init dasd_parse_range(const char *range)
{
struct dasd_devmap *devmap;
int from, from_id0, from_id1;
int to, to_id0, to_id1;
int features;
char bus_id[DASD_BUS_ID_SIZE + 1];
char *features_str = NULL;
char *from_str = NULL;
char *to_str = NULL;
int rc = 0;
char *tmp;
tmp = kstrdup(range, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) {
rc = -EINVAL;
goto out;
}
if (dasd_busid(from_str, &from_id0, &from_id1, &from)) {
rc = -EINVAL;
goto out;
}
to = from;
to_id0 = from_id0;
to_id1 = from_id1;
if (to_str) {
if (dasd_busid(to_str, &to_id0, &to_id1, &to)) {
rc = -EINVAL;
goto out;
}
if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) {
pr_err("%s is not a valid device range\n", range);
rc = -EINVAL;
goto out;
}
}
features = dasd_feature_list(features_str);
if (features < 0) {
rc = -EINVAL;
goto out;
}
/* each device in dasd= parameter should be set initially online */
features |= DASD_FEATURE_INITIAL_ONLINE;
while (from <= to) {
sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++);
devmap = dasd_add_busid(bus_id, features);
if (IS_ERR(devmap)) {
rc = PTR_ERR(devmap);
goto out;
}
}
out:
kfree(tmp);
return rc;
}
/*
* Parse parameters stored in dasd[]
* The 'dasd=...' parameter allows to specify a comma separated list of
* keywords and device ranges. The parameters in that list will be stored as
* separate elementes in dasd[].
*/
int __init dasd_parse(void)
{
int rc, i;
char *cur;
rc = 0;
for (i = 0; i < DASD_MAX_PARAMS; i++) {
cur = dasd[i];
if (!cur)
break;
if (*cur == '\0')
continue;
rc = dasd_parse_keyword(cur);
if (rc)
rc = dasd_parse_range(cur);
if (rc)
break;
}
return rc;
}
/*
* Add a devmap for the device specified by busid. It is possible that
* the devmap already exists (dasd= parameter). The order of the devices
* added through this function will define the kdevs for the individual
* devices.
*/
static struct dasd_devmap *
dasd_add_busid(const char *bus_id, int features)
{
struct dasd_devmap *devmap, *new, *tmp;
int hash;
new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
if (!new)
return ERR_PTR(-ENOMEM);
spin_lock(&dasd_devmap_lock);
devmap = NULL;
hash = dasd_hash_busid(bus_id);
list_for_each_entry(tmp, &dasd_hashlists[hash], list)
if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
devmap = tmp;
break;
}
if (!devmap) {
/* This bus_id is new. */
new->devindex = dasd_max_devindex++;
strscpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
new->features = features;
new->device = NULL;
list_add(&new->list, &dasd_hashlists[hash]);
devmap = new;
new = NULL;
}
spin_unlock(&dasd_devmap_lock);
kfree(new);
return devmap;
}
static struct dasd_devmap *
dasd_find_busid_locked(const char *bus_id)
{
struct dasd_devmap *devmap, *tmp;
int hash;
devmap = ERR_PTR(-ENODEV);
hash = dasd_hash_busid(bus_id);
list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
devmap = tmp;
break;
}
}
return devmap;
}
/*
* Find devmap for device with given bus_id.
*/
static struct dasd_devmap *
dasd_find_busid(const char *bus_id)
{
struct dasd_devmap *devmap;
spin_lock(&dasd_devmap_lock);
devmap = dasd_find_busid_locked(bus_id);
spin_unlock(&dasd_devmap_lock);
return devmap;
}
/*
* Check if busid has been added to the list of dasd ranges.
*/
int
dasd_busid_known(const char *bus_id)
{
return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
}
/*
* Forget all about the device numbers added so far.
* This may only be called at module unload or system shutdown.
*/
static void
dasd_forget_ranges(void)
{
struct dasd_devmap *devmap, *n;
int i;
spin_lock(&dasd_devmap_lock);
for (i = 0; i < 256; i++) {
list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
BUG_ON(devmap->device != NULL);
list_del(&devmap->list);
kfree(devmap);
}
}
spin_unlock(&dasd_devmap_lock);
}
/*
* Find the device struct by its device index.
*/
struct dasd_device *
dasd_device_from_devindex(int devindex)
{
struct dasd_devmap *devmap, *tmp;
struct dasd_device *device;
int i;
spin_lock(&dasd_devmap_lock);
devmap = NULL;
for (i = 0; (i < 256) && !devmap; i++)
list_for_each_entry(tmp, &dasd_hashlists[i], list)
if (tmp->devindex == devindex) {
/* Found the devmap for the device. */
devmap = tmp;
break;
}
if (devmap && devmap->device) {
device = devmap->device;
dasd_get_device(device);
} else
device = ERR_PTR(-ENODEV);
spin_unlock(&dasd_devmap_lock);
return device;
}
/*
* Return devmap for cdev. If no devmap exists yet, create one and
* connect it to the cdev.
*/
static struct dasd_devmap *
dasd_devmap_from_cdev(struct ccw_device *cdev)
{
struct dasd_devmap *devmap;
devmap = dasd_find_busid(dev_name(&cdev->dev));
if (IS_ERR(devmap))
devmap = dasd_add_busid(dev_name(&cdev->dev),
DASD_FEATURE_DEFAULT);
return devmap;
}
/*
* Create a dasd device structure for cdev.
*/
struct dasd_device *
dasd_create_device(struct ccw_device *cdev)
{
struct dasd_devmap *devmap;
struct dasd_device *device;
unsigned long flags;
int rc;
devmap = dasd_devmap_from_cdev(cdev);
if (IS_ERR(devmap))
return (void *) devmap;
device = dasd_alloc_device();
if (IS_ERR(device))
return device;
atomic_set(&device->ref_count, 3);
spin_lock(&dasd_devmap_lock);
if (!devmap->device) {
devmap->device = device;
device->devindex = devmap->devindex;
device->features = devmap->features;
get_device(&cdev->dev);
device->cdev = cdev;
rc = 0;
} else
/* Someone else was faster. */
rc = -EBUSY;
spin_unlock(&dasd_devmap_lock);
if (rc) {
dasd_free_device(device);
return ERR_PTR(rc);
}
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
dev_set_drvdata(&cdev->dev, device);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
device->paths_info = kset_create_and_add("paths_info", NULL,
&device->cdev->dev.kobj);
if (!device->paths_info)
dev_warn(&cdev->dev, "Could not create paths_info kset\n");
return device;
}
/*
* allocate a PPRC data structure and call the discipline function to fill
*/
static int dasd_devmap_get_pprc_status(struct dasd_device *device,
struct dasd_pprc_data_sc4 **data)
{
struct dasd_pprc_data_sc4 *temp;
if (!device->discipline || !device->discipline->pprc_status) {
dev_warn(&device->cdev->dev, "Unable to query copy relation status\n");
return -EOPNOTSUPP;
}
temp = kzalloc(sizeof(*temp), GFP_KERNEL);
if (!temp)
return -ENOMEM;
/* get PPRC information from storage */
if (device->discipline->pprc_status(device, temp)) {
dev_warn(&device->cdev->dev, "Error during copy relation status query\n");
kfree(temp);
return -EINVAL;
}
*data = temp;
return 0;
}
/*
* find an entry in a PPRC device_info array by a given UID
* depending on the primary/secondary state of the device it has to be
* matched with the respective fields
*/
static int dasd_devmap_entry_from_pprc_data(struct dasd_pprc_data_sc4 *data,
struct dasd_uid uid,
bool primary)
{
int i;
for (i = 0; i < DASD_CP_ENTRIES; i++) {
if (primary) {
if (data->dev_info[i].prim_cu_ssid == uid.ssid &&
data->dev_info[i].primary == uid.real_unit_addr)
return i;
} else {
if (data->dev_info[i].sec_cu_ssid == uid.ssid &&
data->dev_info[i].secondary == uid.real_unit_addr)
return i;
}
}
return -1;
}
/*
* check the consistency of a specified copy relation by checking
* the following things:
*
* - is the given device part of a copy pair setup
* - does the state of the device match the state in the PPRC status data
* - does the device UID match with the UID in the PPRC status data
* - to prevent misrouted IO check if the given device is present in all
* related PPRC status data
*/
static int dasd_devmap_check_copy_relation(struct dasd_device *device,
struct dasd_copy_entry *entry,
struct dasd_pprc_data_sc4 *data,
struct dasd_copy_relation *copy)
{
struct dasd_pprc_data_sc4 *tmp_dat;
struct dasd_device *tmp_dev;
struct dasd_uid uid;
int i, j;
if (!device->discipline || !device->discipline->get_uid ||
device->discipline->get_uid(device, &uid))
return 1;
i = dasd_devmap_entry_from_pprc_data(data, uid, entry->primary);
if (i < 0) {
dev_warn(&device->cdev->dev, "Device not part of a copy relation\n");
return 1;
}
/* double check which role the current device has */
if (entry->primary) {
if (data->dev_info[i].flags & 0x80) {
dev_warn(&device->cdev->dev, "Copy pair secondary is setup as primary\n");
return 1;
}
if (data->dev_info[i].prim_cu_ssid != uid.ssid ||
data->dev_info[i].primary != uid.real_unit_addr) {
dev_warn(&device->cdev->dev,
"Primary device %s does not match copy pair status primary device %04x\n",
dev_name(&device->cdev->dev),
data->dev_info[i].prim_cu_ssid |
data->dev_info[i].primary);
return 1;
}
} else {
if (!(data->dev_info[i].flags & 0x80)) {
dev_warn(&device->cdev->dev, "Copy pair primary is setup as secondary\n");
return 1;
}
if (data->dev_info[i].sec_cu_ssid != uid.ssid ||
data->dev_info[i].secondary != uid.real_unit_addr) {
dev_warn(&device->cdev->dev,
"Secondary device %s does not match copy pair status secondary device %04x\n",
dev_name(&device->cdev->dev),
data->dev_info[i].sec_cu_ssid |
data->dev_info[i].secondary);
return 1;
}
}
/*
* the current device has to be part of the copy relation of all
* entries to prevent misrouted IO to another copy pair
*/
for (j = 0; j < DASD_CP_ENTRIES; j++) {
if (entry == &copy->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 = &copy->entry[i];
break;
}
}
if (!entry) {
dev_warn(&device->cdev->dev, "Copy relation entry not found\n");
rc = -EINVAL;
goto out;
}
/* check if the copy relation is valid */
if (dasd_devmap_check_copy_relation(device, entry, data, copy)) {
dev_warn(&device->cdev->dev, "Copy relation faulty\n");
rc = -EINVAL;
goto out;
}
dasd_get_device(device);
copy->entry[i].device = device;
device->copy = copy;
out:
kfree(data);
return rc;
}
EXPORT_SYMBOL_GPL(dasd_devmap_set_device_copy_relation);
/*
* Wait queue for dasd_delete_device waits.
*/
static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
/*
* Remove a dasd device structure. The passed referenced
* is destroyed.
*/
void
dasd_delete_device(struct dasd_device *device)
{
struct ccw_device *cdev;
struct dasd_devmap *devmap;
unsigned long flags;
/* First remove device pointer from devmap. */
devmap = dasd_find_busid(dev_name(&device->cdev->dev));
BUG_ON(IS_ERR(devmap));
spin_lock(&dasd_devmap_lock);
if (devmap->device != device) {
spin_unlock(&dasd_devmap_lock);
dasd_put_device(device);
return;
}
devmap->device = NULL;
spin_unlock(&dasd_devmap_lock);
/* Disconnect dasd_device structure from ccw_device structure. */
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
dev_set_drvdata(&device->cdev->dev, NULL);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
/* Removve copy relation */
dasd_devmap_delete_copy_relation_device(device);
/*
* Drop ref_count by 3, one for the devmap reference, one for
* the cdev reference and one for the passed reference.
*/
atomic_sub(3, &device->ref_count);
/* Wait for reference counter to drop to zero. */
wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
dasd_generic_free_discipline(device);
kset_unregister(device->paths_info);
/* Disconnect dasd_device structure from ccw_device structure. */
cdev = device->cdev;
device->cdev = NULL;
/* Put ccw_device structure. */
put_device(&cdev->dev);
/* Now the device structure can be freed. */
dasd_free_device(device);
}
/*
* Reference counter dropped to zero. Wake up waiter
* in dasd_delete_device.
*/
void
dasd_put_device_wake(struct dasd_device *device)
{
wake_up(&dasd_delete_wq);
}
EXPORT_SYMBOL_GPL(dasd_put_device_wake);
/*
* Return dasd_device structure associated with cdev.
* This function needs to be called with the ccw device
* lock held. It can be used from interrupt context.
*/
struct dasd_device *
dasd_device_from_cdev_locked(struct ccw_device *cdev)
{
struct dasd_device *device = dev_get_drvdata(&cdev->dev);
if (!device)
return ERR_PTR(-ENODEV);
dasd_get_device(device);
return device;
}
/*
* Return dasd_device structure associated with cdev.
*/
struct dasd_device *
dasd_device_from_cdev(struct ccw_device *cdev)
{
struct dasd_device *device;
unsigned long flags;
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
device = dasd_device_from_cdev_locked(cdev);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
return device;
}
void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
{
struct dasd_devmap *devmap;
devmap = dasd_find_busid(dev_name(&device->cdev->dev));
if (IS_ERR(devmap))
return;
spin_lock(&dasd_devmap_lock);
gdp->private_data = devmap;
spin_unlock(&dasd_devmap_lock);
}
EXPORT_SYMBOL(dasd_add_link_to_gendisk);
struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
{
struct dasd_device *device;
struct dasd_devmap *devmap;
if (!gdp->private_data)
return NULL;
device = NULL;
spin_lock(&dasd_devmap_lock);
devmap = gdp->private_data;
if (devmap && devmap->device) {
device = devmap->device;
dasd_get_device(device);
}
spin_unlock(&dasd_devmap_lock);
return device;
}
/*
* SECTION: files in sysfs
*/
/*
* failfast controls the behaviour, if no path is available
*/
static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_devmap *devmap;
int ff_flag;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
else
ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
return sysfs_emit(buf, ff_flag ? "1\n" : "0\n");
}
static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned int val;
int rc;
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
return rc ? : count;
}
static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
/*
* readonly controls the readonly status of a dasd
*/
static ssize_t
dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
struct dasd_device *device;
int ro_flag = 0;
devmap = dasd_find_busid(dev_name(dev));
if (IS_ERR(devmap))
goto out;
ro_flag = !!(devmap->features & DASD_FEATURE_READONLY);
spin_lock(&dasd_devmap_lock);
device = devmap->device;
if (device)
ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
spin_unlock(&dasd_devmap_lock);
out:
return sysfs_emit(buf, ro_flag ? "1\n" : "0\n");
}
static ssize_t
dasd_ro_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct dasd_device *device;
unsigned long flags;
unsigned int val;
int rc;
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
if (rc)
return rc;
device = dasd_device_from_cdev(cdev);
if (IS_ERR(device))
return count;
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
if (!device->block || !device->block->gdp ||
test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
goto out;
}
/* Increase open_count to avoid losing the block device */
atomic_inc(&device->block->open_count);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
set_disk_ro(device->block->gdp, val);
atomic_dec(&device->block->open_count);
out:
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
/*
* erplog controls the logging of ERP related data
* (e.g. failing channel programs).
*/
static ssize_t
dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int erplog;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
else
erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
return sysfs_emit(buf, erplog ? "1\n" : "0\n");
}
static ssize_t
dasd_erplog_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned int val;
int rc;
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
return rc ? : count;
}
static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
/*
* use_diag controls whether the driver should use diag rather than ssch
* to talk to the device
*/
static ssize_t
dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int use_diag;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
else
use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
return sprintf(buf, use_diag ? "1\n" : "0\n");
}
static ssize_t
dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_devmap *devmap;
unsigned int val;
ssize_t rc;
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
if (IS_ERR(devmap))
return PTR_ERR(devmap);
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
spin_lock(&dasd_devmap_lock);
/* Changing diag discipline flag is only allowed in offline state. */
rc = count;
if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
if (val)
devmap->features |= DASD_FEATURE_USEDIAG;
else
devmap->features &= ~DASD_FEATURE_USEDIAG;
} else
rc = -EPERM;
spin_unlock(&dasd_devmap_lock);
return rc;
}
static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
/*
* use_raw controls whether the driver should give access to raw eckd data or
* operate in standard mode
*/
static ssize_t
dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int use_raw;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
else
use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
return sprintf(buf, use_raw ? "1\n" : "0\n");
}
static ssize_t
dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_devmap *devmap;
ssize_t rc;
unsigned long val;
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
if (IS_ERR(devmap))
return PTR_ERR(devmap);
if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
return -EINVAL;
spin_lock(&dasd_devmap_lock);
/* Changing diag discipline flag is only allowed in offline state. */
rc = count;
if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
if (val)
devmap->features |= DASD_FEATURE_USERAW;
else
devmap->features &= ~DASD_FEATURE_USERAW;
} else
rc = -EPERM;
spin_unlock(&dasd_devmap_lock);
return rc;
}
static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
dasd_use_raw_store);
static ssize_t
dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct dasd_device *device;
unsigned long flags;
int rc;
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
device = dasd_device_from_cdev_locked(cdev);
if (IS_ERR(device)) {
rc = PTR_ERR(device);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
goto out;
}
if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
/* Already doing offline processing */
dasd_put_device(device);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
rc = -EBUSY;
goto out;
}
set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
dasd_put_device(device);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
rc = ccw_device_set_offline(cdev);
out:
return rc ? rc : count;
}
static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
static ssize_t
dasd_access_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ccw_device *cdev = to_ccwdev(dev);
struct dasd_device *device;
int count;
device = dasd_device_from_cdev(cdev);
if (IS_ERR(device))
return PTR_ERR(device);
if (!device->discipline)
count = -ENODEV;
else if (!device->discipline->host_access_count)
count = -EOPNOTSUPP;
else
count = device->discipline->host_access_count(device);
dasd_put_device(device);
if (count < 0)
return count;
return sprintf(buf, "%d\n", count);
}
static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
static ssize_t
dasd_discipline_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_device *device;
ssize_t len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
goto out;
else if (!device->discipline) {
dasd_put_device(device);
goto out;
} else {
len = sysfs_emit(buf, "%s\n",
device->discipline->name);
dasd_put_device(device);
return len;
}
out:
len = sysfs_emit(buf, "none\n");
return len;
}
static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
static ssize_t
dasd_device_status_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_device *device;
ssize_t len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (!IS_ERR(device)) {
switch (device->state) {
case DASD_STATE_NEW:
len = sysfs_emit(buf, "new\n");
break;
case DASD_STATE_KNOWN:
len = sysfs_emit(buf, "detected\n");
break;
case DASD_STATE_BASIC:
len = sysfs_emit(buf, "basic\n");
break;
case DASD_STATE_UNFMT:
len = sysfs_emit(buf, "unformatted\n");
break;
case DASD_STATE_READY:
len = sysfs_emit(buf, "ready\n");
break;
case DASD_STATE_ONLINE:
len = sysfs_emit(buf, "online\n");
break;
default:
len = sysfs_emit(buf, "no stat\n");
break;
}
dasd_put_device(device);
} else
len = sysfs_emit(buf, "unknown\n");
return len;
}
static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
static ssize_t dasd_alias_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
struct dasd_uid uid;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return sprintf(buf, "0\n");
if (device->discipline && device->discipline->get_uid &&
!device->discipline->get_uid(device, &uid)) {
if (uid.type == UA_BASE_PAV_ALIAS ||
uid.type == UA_HYPER_PAV_ALIAS) {
dasd_put_device(device);
return sprintf(buf, "1\n");
}
}
dasd_put_device(device);
return sprintf(buf, "0\n");
}
static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
static ssize_t dasd_vendor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
struct dasd_uid uid;
char *vendor;
device = dasd_device_from_cdev(to_ccwdev(dev));
vendor = "";
if (IS_ERR(device))
return sysfs_emit(buf, "%s\n", vendor);
if (device->discipline && device->discipline->get_uid &&
!device->discipline->get_uid(device, &uid))
vendor = uid.vendor;
dasd_put_device(device);
return sysfs_emit(buf, "%s\n", vendor);
}
static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
#define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\
/* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\
/* vduit */ 32 + 1)
static ssize_t
dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
struct dasd_uid uid;
char uid_string[UID_STRLEN];
char ua_string[3];
device = dasd_device_from_cdev(to_ccwdev(dev));
uid_string[0] = 0;
if (IS_ERR(device))
return sysfs_emit(buf, "%s\n", uid_string);
if (device->discipline && device->discipline->get_uid &&
!device->discipline->get_uid(device, &uid)) {
switch (uid.type) {
case UA_BASE_DEVICE:
snprintf(ua_string, sizeof(ua_string), "%02x",
uid.real_unit_addr);
break;
case UA_BASE_PAV_ALIAS:
snprintf(ua_string, sizeof(ua_string), "%02x",
uid.base_unit_addr);
break;
case UA_HYPER_PAV_ALIAS:
snprintf(ua_string, sizeof(ua_string), "xx");
break;
default:
/* should not happen, treat like base device */
snprintf(ua_string, sizeof(ua_string), "%02x",
uid.real_unit_addr);
break;
}
if (strlen(uid.vduit) > 0)
snprintf(uid_string, sizeof(uid_string),
"%s.%s.%04x.%s.%s",
uid.vendor, uid.serial, uid.ssid, ua_string,
uid.vduit);
else
snprintf(uid_string, sizeof(uid_string),
"%s.%s.%04x.%s",
uid.vendor, uid.serial, uid.ssid, ua_string);
}
dasd_put_device(device);
return sysfs_emit(buf, "%s\n", uid_string);
}
static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
/*
* extended error-reporting
*/
static ssize_t
dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int eer_flag;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap) && devmap->device)
eer_flag = dasd_eer_enabled(devmap->device);
else
eer_flag = 0;
return sysfs_emit(buf, eer_flag ? "1\n" : "0\n");
}
static ssize_t
dasd_eer_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned int val;
int rc = 0;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return PTR_ERR(device);
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
if (val)
rc = dasd_eer_enable(device);
else
dasd_eer_disable(device);
dasd_put_device(device);
return rc ? : count;
}
static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
/*
* expiration time for default requests
*/
static ssize_t
dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
int len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
len = sysfs_emit(buf, "%lu\n", device->default_expires);
dasd_put_device(device);
return len;
}
static ssize_t
dasd_expires_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned long val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if ((kstrtoul(buf, 10, &val) != 0) ||
(val > DASD_EXPIRES_MAX) || val == 0) {
dasd_put_device(device);
return -EINVAL;
}
if (val)
device->default_expires = val;
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
static ssize_t
dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
int len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
len = sysfs_emit(buf, "%lu\n", device->default_retries);
dasd_put_device(device);
return len;
}
static ssize_t
dasd_retries_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned long val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if ((kstrtoul(buf, 10, &val) != 0) ||
(val > DASD_RETRIES_MAX)) {
dasd_put_device(device);
return -EINVAL;
}
if (val)
device->default_retries = val;
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
static ssize_t
dasd_timeout_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_device *device;
int len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
len = sysfs_emit(buf, "%lu\n", device->blk_timeout);
dasd_put_device(device);
return len;
}
static ssize_t
dasd_timeout_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned long val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device) || !device->block)
return -ENODEV;
if ((kstrtoul(buf, 10, &val) != 0) ||
val > UINT_MAX / HZ) {
dasd_put_device(device);
return -EINVAL;
}
if (!device->block->gdp) {
dasd_put_device(device);
return -ENODEV;
}
device->blk_timeout = val;
blk_queue_rq_timeout(device->block->gdp->queue, val * HZ);
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(timeout, 0644,
dasd_timeout_show, dasd_timeout_store);
static ssize_t
dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned int val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
val = 0;
if (device->discipline && device->discipline->reset_path)
device->discipline->reset_path(device, (__u8) val);
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_device *device;
int hpf;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if (!device->discipline || !device->discipline->hpf_enabled) {
dasd_put_device(device);
return sysfs_emit(buf, "%d\n", dasd_nofcx);
}
hpf = device->discipline->hpf_enabled(device);
dasd_put_device(device);
return sysfs_emit(buf, "%d\n", hpf);
}
static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
static ssize_t dasd_reservation_policy_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct dasd_devmap *devmap;
int rc = 0;
devmap = dasd_find_busid(dev_name(dev));
if (IS_ERR(devmap)) {
rc = sysfs_emit(buf, "ignore\n");
} else {
spin_lock(&dasd_devmap_lock);
if (devmap->features & DASD_FEATURE_FAILONSLCK)
rc = sysfs_emit(buf, "fail\n");
else
rc = sysfs_emit(buf, "ignore\n");
spin_unlock(&dasd_devmap_lock);
}
return rc;
}
static ssize_t dasd_reservation_policy_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ccw_device *cdev = to_ccwdev(dev);
int rc;
if (sysfs_streq("ignore", buf))
rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
else if (sysfs_streq("fail", buf))
rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
else
rc = -EINVAL;
return rc ? : count;
}
static DEVICE_ATTR(reservation_policy, 0644,
dasd_reservation_policy_show, dasd_reservation_policy_store);
static ssize_t dasd_reservation_state_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct dasd_device *device;
int rc = 0;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return sysfs_emit(buf, "none\n");
if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
rc = sysfs_emit(buf, "reserved\n");
else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
rc = sysfs_emit(buf, "lost\n");
else
rc = sysfs_emit(buf, "none\n");
dasd_put_device(device);
return rc;
}
static ssize_t dasd_reservation_state_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
int rc = 0;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if (sysfs_streq("reset", buf))
clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
else
rc = -EINVAL;
dasd_put_device(device);
if (rc)
return rc;
else
return count;
}
static DEVICE_ATTR(last_known_reservation_state, 0644,
dasd_reservation_state_show, dasd_reservation_state_store);
static ssize_t dasd_pm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return sprintf(buf, "0\n");
opm = dasd_path_get_opm(device);
nppm = dasd_path_get_nppm(device);
cablepm = dasd_path_get_cablepm(device);
cuirpm = dasd_path_get_cuirpm(device);
hpfpm = dasd_path_get_hpfpm(device);
ifccpm = dasd_path_get_ifccpm(device);
dasd_put_device(device);
return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
cablepm, cuirpm, hpfpm, ifccpm);
}
static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
/*
* threshold value for IFCC/CCC errors
*/
static ssize_t
dasd_path_threshold_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
int len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
len = sysfs_emit(buf, "%lu\n", device->path_thrhld);
dasd_put_device(device);
return len;
}
static ssize_t
dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned long flags;
unsigned long val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) {
dasd_put_device(device);
return -EINVAL;
}
spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
device->path_thrhld = val;
spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
dasd_path_threshold_store);
/*
* configure if path is disabled after IFCC/CCC error threshold is
* exceeded
*/
static ssize_t
dasd_path_autodisable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_devmap *devmap;
int flag;
devmap = dasd_find_busid(dev_name(dev));
if (!IS_ERR(devmap))
flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
else
flag = (DASD_FEATURE_DEFAULT &
DASD_FEATURE_PATH_AUTODISABLE) != 0;
return sysfs_emit(buf, flag ? "1\n" : "0\n");
}
static ssize_t
dasd_path_autodisable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
unsigned int val;
int rc;
if (kstrtouint(buf, 0, &val) || val > 1)
return -EINVAL;
rc = dasd_set_feature(to_ccwdev(dev),
DASD_FEATURE_PATH_AUTODISABLE, val);
return rc ? : count;
}
static DEVICE_ATTR(path_autodisable, 0644,
dasd_path_autodisable_show,
dasd_path_autodisable_store);
/*
* interval for IFCC/CCC checks
* meaning time with no IFCC/CCC error before the error counter
* gets reset
*/
static ssize_t
dasd_path_interval_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_device *device;
int len;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
len = sysfs_emit(buf, "%lu\n", device->path_interval);
dasd_put_device(device);
return len;
}
static ssize_t
dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
unsigned long flags;
unsigned long val;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if ((kstrtoul(buf, 10, &val) != 0) ||
(val > DASD_INTERVAL_MAX) || val == 0) {
dasd_put_device(device);
return -EINVAL;
}
spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
if (val)
device->path_interval = val;
spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
dasd_put_device(device);
return count;
}
static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
dasd_path_interval_store);
static ssize_t
dasd_device_fcs_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct dasd_device *device;
int fc_sec;
int rc;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
fc_sec = dasd_path_get_fcs_device(device);
if (fc_sec == -EINVAL)
rc = sysfs_emit(buf, "Inconsistent\n");
else
rc = sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec));
dasd_put_device(device);
return rc;
}
static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL);
static ssize_t
dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct dasd_path *path = to_dasd_path(kobj);
unsigned int fc_sec = path->fc_security;
return sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec));
}
static struct kobj_attribute path_fcs_attribute =
__ATTR(fc_security, 0444, dasd_path_fcs_show, NULL);
/*
* print copy relation in the form
* primary,secondary[1] primary,secondary[2], ...
*/
static ssize_t
dasd_copy_pair_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
char prim_busid[DASD_BUS_ID_SIZE];
struct dasd_copy_relation *copy;
struct dasd_devmap *devmap;
int len = 0;
int i;
devmap = dasd_find_busid(dev_name(dev));
if (IS_ERR(devmap))
return -ENODEV;
if (!devmap->copy)
return -ENODEV;
copy = devmap->copy;
/* find primary */
for (i = 0; i < DASD_CP_ENTRIES; i++) {
if (copy->entry[i].configured && copy->entry[i].primary) {
strscpy(prim_busid, copy->entry[i].busid,
DASD_BUS_ID_SIZE);
break;
}
}
if (i == DASD_CP_ENTRIES)
goto out;
/* print all secondary */
for (i = 0; i < DASD_CP_ENTRIES; i++) {
if (copy->entry[i].configured && !copy->entry[i].primary)
len += sysfs_emit_at(buf, len, "%s,%s ", prim_busid,
copy->entry[i].busid);
}
len += sysfs_emit_at(buf, len, "\n");
out:
return len;
}
static int dasd_devmap_set_copy_relation(struct dasd_devmap *devmap,
struct dasd_copy_relation *copy,
char *busid, bool primary)
{
int i;
/* find free entry */
for (i = 0; i < DASD_CP_ENTRIES; i++) {
/* current bus_id already included, nothing to do */
if (copy->entry[i].configured &&
strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0)
return 0;
if (!copy->entry[i].configured)
break;
}
if (i == DASD_CP_ENTRIES)
return -EINVAL;
copy->entry[i].configured = true;
strscpy(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE);
if (primary) {
copy->active = &copy->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 == &copy->entry[i]) {
copy->active = NULL;
copy->entry[i].primary = false;
}
spin_unlock(&dasd_devmap_lock);
}
static int dasd_devmap_clear_copy_relation(struct device *dev)
{
struct dasd_copy_relation *copy;
struct dasd_devmap *devmap;
int i, rc = 1;
devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
if (IS_ERR(devmap))
return 1;
spin_lock(&dasd_devmap_lock);
if (!devmap->copy)
goto out;
copy = devmap->copy;
/* first check if all secondary devices are offline*/
for (i = 0; i < DASD_CP_ENTRIES; i++) {
if (!copy->entry[i].configured)
continue;
if (copy->entry[i].device == copy->active->device)
continue;
if (copy->entry[i].device)
goto out;
}
/* clear all devmap entries */
for (i = 0; i < DASD_CP_ENTRIES; i++) {
if (strlen(copy->entry[i].busid) == 0)
continue;
if (copy->entry[i].device) {
dasd_put_device(copy->entry[i].device);
copy->entry[i].device->copy = NULL;
copy->entry[i].device = NULL;
}
devmap = dasd_find_busid_locked(copy->entry[i].busid);
devmap->copy = NULL;
memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE);
}
kfree(copy);
rc = 0;
out:
spin_unlock(&dasd_devmap_lock);
return rc;
}
/*
* parse BUSIDs from a copy pair
*/
static int dasd_devmap_parse_busid(const char *buf, char *prim_busid,
char *sec_busid)
{
char *primary, *secondary, *tmp, *pt;
int id0, id1, id2;
pt = kstrdup(buf, GFP_KERNEL);
tmp = pt;
if (!tmp)
return -ENOMEM;
primary = strsep(&tmp, ",");
if (!primary) {
kfree(pt);
return -EINVAL;
}
secondary = strsep(&tmp, ",");
if (!secondary) {
kfree(pt);
return -EINVAL;
}
if (dasd_busid(primary, &id0, &id1, &id2)) {
kfree(pt);
return -EINVAL;
}
sprintf(prim_busid, "%01x.%01x.%04x", id0, id1, id2);
if (dasd_busid(secondary, &id0, &id1, &id2)) {
kfree(pt);
return -EINVAL;
}
sprintf(sec_busid, "%01x.%01x.%04x", id0, id1, id2);
kfree(pt);
return 0;
}
static ssize_t dasd_copy_pair_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_devmap *prim_devmap, *sec_devmap;
char prim_busid[DASD_BUS_ID_SIZE];
char sec_busid[DASD_BUS_ID_SIZE];
struct dasd_copy_relation *copy;
struct dasd_device *device;
bool pprc_enabled;
int rc;
if (strncmp(buf, "clear", strlen("clear")) == 0) {
if (dasd_devmap_clear_copy_relation(dev))
return -EINVAL;
return count;
}
rc = dasd_devmap_parse_busid(buf, prim_busid, sec_busid);
if (rc)
return rc;
if (strncmp(dev_name(dev), prim_busid, DASD_BUS_ID_SIZE) != 0 &&
strncmp(dev_name(dev), sec_busid, DASD_BUS_ID_SIZE) != 0)
return -EINVAL;
/* allocate primary devmap if needed */
prim_devmap = dasd_find_busid(prim_busid);
if (IS_ERR(prim_devmap))
prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT);
/* allocate secondary devmap if needed */
sec_devmap = dasd_find_busid(sec_busid);
if (IS_ERR(sec_devmap))
sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT);
/* setting copy relation is only allowed for offline secondary */
if (sec_devmap->device)
return -EINVAL;
if (prim_devmap->copy) {
copy = prim_devmap->copy;
} else if (sec_devmap->copy) {
copy = sec_devmap->copy;
} else {
copy = kzalloc(sizeof(*copy), GFP_KERNEL);
if (!copy)
return -ENOMEM;
}
spin_lock(&dasd_devmap_lock);
rc = dasd_devmap_set_copy_relation(prim_devmap, copy, prim_busid, true);
if (rc) {
spin_unlock(&dasd_devmap_lock);
return rc;
}
rc = dasd_devmap_set_copy_relation(sec_devmap, copy, sec_busid, false);
if (rc) {
spin_unlock(&dasd_devmap_lock);
return rc;
}
spin_unlock(&dasd_devmap_lock);
/* if primary device is already online call device setup directly */
if (prim_devmap->device && !prim_devmap->device->copy) {
device = prim_devmap->device;
if (device->discipline->pprc_enabled) {
pprc_enabled = device->discipline->pprc_enabled(device);
rc = dasd_devmap_set_device_copy_relation(device->cdev,
pprc_enabled);
} else {
rc = -EOPNOTSUPP;
}
}
if (rc) {
dasd_devmap_del_copy_relation(copy, prim_busid);
dasd_devmap_del_copy_relation(copy, sec_busid);
count = rc;
}
return count;
}
static DEVICE_ATTR(copy_pair, 0644, dasd_copy_pair_show,
dasd_copy_pair_store);
static ssize_t
dasd_copy_role_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dasd_copy_relation *copy;
struct dasd_device *device;
int len, i;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
if (!device->copy) {
len = sysfs_emit(buf, "none\n");
goto out;
}
copy = device->copy;
/* only the active device is primary */
if (copy->active->device == device) {
len = sysfs_emit(buf, "primary\n");
goto out;
}
for (i = 0; i < DASD_CP_ENTRIES; i++) {
if (copy->entry[i].device == device) {
len = sysfs_emit(buf, "secondary\n");
goto out;
}
}
/* not in the list, no COPY role */
len = sysfs_emit(buf, "none\n");
out:
dasd_put_device(device);
return len;
}
static DEVICE_ATTR(copy_role, 0444, dasd_copy_role_show, NULL);
static ssize_t dasd_device_ping(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct dasd_device *device;
size_t rc;
device = dasd_device_from_cdev(to_ccwdev(dev));
if (IS_ERR(device))
return -ENODEV;
/*
* do not try during offline processing
* early check only
* the sleep_on function itself checks for offline
* processing again
*/
if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
rc = -EBUSY;
goto out;
}
if (!device->discipline || !device->discipline->device_ping) {
rc = -EOPNOTSUPP;
goto out;
}
rc = device->discipline->device_ping(device);
if (!rc)
rc = count;
out:
dasd_put_device(device);
return rc;
}
static DEVICE_ATTR(ping, 0200, NULL, dasd_device_ping);
#define DASD_DEFINE_ATTR(_name, _func) \
static ssize_t dasd_##_name##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct ccw_device *cdev = to_ccwdev(dev); \
struct dasd_device *device = dasd_device_from_cdev(cdev); \
int val = 0; \
\
if (IS_ERR(device)) \
return -ENODEV; \
if (device->discipline && _func) \
val = _func(device); \
dasd_put_device(device); \
\
return sysfs_emit(buf, "%d\n", val); \
} \
static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \
DASD_DEFINE_ATTR(ese, device->discipline->is_ese);
DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size);
DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id);
DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured);
DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated);
DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity);
DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld);
DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel);
DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos);
static struct attribute * dasd_attrs[] = {
&dev_attr_readonly.attr,
&dev_attr_discipline.attr,
&dev_attr_status.attr,
&dev_attr_alias.attr,
&dev_attr_vendor.attr,
&dev_attr_uid.attr,
&dev_attr_use_diag.attr,
&dev_attr_raw_track_access.attr,
&dev_attr_eer_enabled.attr,
&dev_attr_erplog.attr,
&dev_attr_failfast.attr,
&dev_attr_expires.attr,
&dev_attr_retries.attr,
&dev_attr_timeout.attr,
&dev_attr_reservation_policy.attr,
&dev_attr_last_known_reservation_state.attr,
&dev_attr_safe_offline.attr,
&dev_attr_host_access_count.attr,
&dev_attr_path_masks.attr,
&dev_attr_path_threshold.attr,
&dev_attr_path_autodisable.attr,
&dev_attr_path_interval.attr,
&dev_attr_path_reset.attr,
&dev_attr_hpf.attr,
&dev_attr_ese.attr,
&dev_attr_fc_security.attr,
&dev_attr_copy_pair.attr,
&dev_attr_copy_role.attr,
&dev_attr_ping.attr,
NULL,
};
static const struct attribute_group dasd_attr_group = {
.attrs = dasd_attrs,
};
static struct attribute *capacity_attrs[] = {
&dev_attr_space_configured.attr,
&dev_attr_space_allocated.attr,
&dev_attr_logical_capacity.attr,
NULL,
};
static const struct attribute_group capacity_attr_group = {
.name = "capacity",
.attrs = capacity_attrs,
};
static struct attribute *ext_pool_attrs[] = {
&dev_attr_pool_id.attr,
&dev_attr_extent_size.attr,
&dev_attr_warn_threshold.attr,
&dev_attr_cap_at_warnlevel.attr,
&dev_attr_pool_oos.attr,
NULL,
};
static const struct attribute_group ext_pool_attr_group = {
.name = "extent_pool",
.attrs = ext_pool_attrs,
};
const struct attribute_group *dasd_dev_groups[] = {
&dasd_attr_group,
&capacity_attr_group,
&ext_pool_attr_group,
NULL,
};
EXPORT_SYMBOL_GPL(dasd_dev_groups);
/*
* Return value of the specified feature.
*/
int
dasd_get_feature(struct ccw_device *cdev, int feature)
{
struct dasd_devmap *devmap;
devmap = dasd_find_busid(dev_name(&cdev->dev));
if (IS_ERR(devmap))
return PTR_ERR(devmap);
return ((devmap->features & feature) != 0);
}
/*
* Set / reset given feature.
* Flag indicates whether to set (!=0) or the reset (=0) the feature.
*/
int
dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
{
struct dasd_devmap *devmap;
devmap = dasd_devmap_from_cdev(cdev);
if (IS_ERR(devmap))
return PTR_ERR(devmap);
spin_lock(&dasd_devmap_lock);
if (flag)
devmap->features |= feature;
else
devmap->features &= ~feature;
if (devmap->device)
devmap->device->features = devmap->features;
spin_unlock(&dasd_devmap_lock);
return 0;
}
EXPORT_SYMBOL(dasd_set_feature);
static struct attribute *paths_info_attrs[] = {
&path_fcs_attribute.attr,
NULL,
};
ATTRIBUTE_GROUPS(paths_info);
static struct kobj_type path_attr_type = {
.release = dasd_path_release,
.default_groups = paths_info_groups,
.sysfs_ops = &kobj_sysfs_ops,
};
static void dasd_path_init_kobj(struct dasd_device *device, int chp)
{
device->path[chp].kobj.kset = device->paths_info;
kobject_init(&device->path[chp].kobj, &path_attr_type);
}
void dasd_path_create_kobj(struct dasd_device *device, int chp)
{
int rc;
if (test_bit(DASD_FLAG_OFFLINE, &device->flags))
return;
if (!device->paths_info) {
dev_warn(&device->cdev->dev, "Unable to create paths objects\n");
return;
}
if (device->path[chp].in_sysfs)
return;
if (!device->path[chp].conf_data)
return;
dasd_path_init_kobj(device, chp);
rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x",
device->path[chp].cssid, device->path[chp].chpid);
if (rc)
kobject_put(&device->path[chp].kobj);
device->path[chp].in_sysfs = true;
}
EXPORT_SYMBOL(dasd_path_create_kobj);
void dasd_path_create_kobjects(struct dasd_device *device)
{
u8 lpm, opm;
opm = dasd_path_get_opm(device);
for (lpm = 0x80; lpm; lpm >>= 1) {
if (!(lpm & opm))
continue;
dasd_path_create_kobj(device, pathmask_to_pos(lpm));
}
}
EXPORT_SYMBOL(dasd_path_create_kobjects);
static void dasd_path_remove_kobj(struct dasd_device *device, int chp)
{
if (device->path[chp].in_sysfs) {
kobject_put(&device->path[chp].kobj);
device->path[chp].in_sysfs = false;
}
}
/*
* As we keep kobjects for the lifetime of a device, this function must not be
* called anywhere but in the context of offlining a device.
*/
void dasd_path_remove_kobjects(struct dasd_device *device)
{
int i;
for (i = 0; i < 8; i++)
dasd_path_remove_kobj(device, i);
}
EXPORT_SYMBOL(dasd_path_remove_kobjects);
int
dasd_devmap_init(void)
{
int i;
/* Initialize devmap structures. */
dasd_max_devindex = 0;
for (i = 0; i < 256; i++)
INIT_LIST_HEAD(&dasd_hashlists[i]);
return 0;
}
void
dasd_devmap_exit(void)
{
dasd_forget_ranges();
}