LCOV - code coverage report
Current view: top level - drivers/base - swnode.c (source / functions) Hit Total Coverage
Test: landlock.info Lines: 11 473 2.3 %
Date: 2021-04-22 12:43:58 Functions: 3 47 6.4 %

          Line data    Source code
       1             : // SPDX-License-Identifier: GPL-2.0
       2             : /*
       3             :  * Software nodes for the firmware node framework.
       4             :  *
       5             :  * Copyright (C) 2018, Intel Corporation
       6             :  * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
       7             :  */
       8             : 
       9             : #include <linux/device.h>
      10             : #include <linux/kernel.h>
      11             : #include <linux/property.h>
      12             : #include <linux/slab.h>
      13             : 
      14             : struct swnode {
      15             :         int id;
      16             :         struct kobject kobj;
      17             :         struct fwnode_handle fwnode;
      18             :         const struct software_node *node;
      19             : 
      20             :         /* hierarchy */
      21             :         struct ida child_ids;
      22             :         struct list_head entry;
      23             :         struct list_head children;
      24             :         struct swnode *parent;
      25             : 
      26             :         unsigned int allocated:1;
      27             :         unsigned int managed:1;
      28             : };
      29             : 
      30             : static DEFINE_IDA(swnode_root_ids);
      31             : static struct kset *swnode_kset;
      32             : 
      33             : #define kobj_to_swnode(_kobj_) container_of(_kobj_, struct swnode, kobj)
      34             : 
      35             : static const struct fwnode_operations software_node_ops;
      36             : 
      37           0 : bool is_software_node(const struct fwnode_handle *fwnode)
      38             : {
      39           0 :         return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
      40             : }
      41             : EXPORT_SYMBOL_GPL(is_software_node);
      42             : 
      43             : #define to_swnode(__fwnode)                                             \
      44             :         ({                                                              \
      45             :                 typeof(__fwnode) __to_swnode_fwnode = __fwnode;         \
      46             :                                                                         \
      47             :                 is_software_node(__to_swnode_fwnode) ?                  \
      48             :                         container_of(__to_swnode_fwnode,                \
      49             :                                      struct swnode, fwnode) : NULL;     \
      50             :         })
      51             : 
      52         175 : static inline struct swnode *dev_to_swnode(struct device *dev)
      53             : {
      54         175 :         struct fwnode_handle *fwnode = dev_fwnode(dev);
      55             : 
      56         175 :         if (!fwnode)
      57             :                 return NULL;
      58             : 
      59           0 :         if (!is_software_node(fwnode))
      60           0 :                 fwnode = fwnode->secondary;
      61             : 
      62           0 :         return to_swnode(fwnode);
      63             : }
      64             : 
      65             : static struct swnode *
      66           0 : software_node_to_swnode(const struct software_node *node)
      67             : {
      68           0 :         struct swnode *swnode = NULL;
      69           0 :         struct kobject *k;
      70             : 
      71           0 :         if (!node)
      72             :                 return NULL;
      73             : 
      74           0 :         spin_lock(&swnode_kset->list_lock);
      75             : 
      76           0 :         list_for_each_entry(k, &swnode_kset->list, entry) {
      77           0 :                 swnode = kobj_to_swnode(k);
      78           0 :                 if (swnode->node == node)
      79             :                         break;
      80           0 :                 swnode = NULL;
      81             :         }
      82             : 
      83           0 :         spin_unlock(&swnode_kset->list_lock);
      84             : 
      85           0 :         return swnode;
      86             : }
      87             : 
      88           0 : const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
      89             : {
      90           0 :         const struct swnode *swnode = to_swnode(fwnode);
      91             : 
      92           0 :         return swnode ? swnode->node : NULL;
      93             : }
      94             : EXPORT_SYMBOL_GPL(to_software_node);
      95             : 
      96           0 : struct fwnode_handle *software_node_fwnode(const struct software_node *node)
      97             : {
      98           0 :         struct swnode *swnode = software_node_to_swnode(node);
      99             : 
     100           0 :         return swnode ? &swnode->fwnode : NULL;
     101             : }
     102             : EXPORT_SYMBOL_GPL(software_node_fwnode);
     103             : 
     104             : /* -------------------------------------------------------------------------- */
     105             : /* property_entry processing */
     106             : 
     107             : static const struct property_entry *
     108           0 : property_entry_get(const struct property_entry *prop, const char *name)
     109             : {
     110           0 :         if (!prop)
     111             :                 return NULL;
     112             : 
     113           0 :         for (; prop->name; prop++)
     114           0 :                 if (!strcmp(name, prop->name))
     115           0 :                         return prop;
     116             : 
     117             :         return NULL;
     118             : }
     119             : 
     120           0 : static const void *property_get_pointer(const struct property_entry *prop)
     121             : {
     122           0 :         if (!prop->length)
     123             :                 return NULL;
     124             : 
     125           0 :         return prop->is_inline ? &prop->value : prop->pointer;
     126             : }
     127             : 
     128           0 : static const void *property_entry_find(const struct property_entry *props,
     129             :                                        const char *propname, size_t length)
     130             : {
     131           0 :         const struct property_entry *prop;
     132           0 :         const void *pointer;
     133             : 
     134           0 :         prop = property_entry_get(props, propname);
     135           0 :         if (!prop)
     136           0 :                 return ERR_PTR(-EINVAL);
     137           0 :         pointer = property_get_pointer(prop);
     138           0 :         if (!pointer)
     139           0 :                 return ERR_PTR(-ENODATA);
     140           0 :         if (length > prop->length)
     141           0 :                 return ERR_PTR(-EOVERFLOW);
     142             :         return pointer;
     143             : }
     144             : 
     145             : static int
     146           0 : property_entry_count_elems_of_size(const struct property_entry *props,
     147             :                                    const char *propname, size_t length)
     148             : {
     149           0 :         const struct property_entry *prop;
     150             : 
     151           0 :         prop = property_entry_get(props, propname);
     152           0 :         if (!prop)
     153             :                 return -EINVAL;
     154             : 
     155           0 :         return prop->length / length;
     156             : }
     157             : 
     158           0 : static int property_entry_read_int_array(const struct property_entry *props,
     159             :                                          const char *name,
     160             :                                          unsigned int elem_size, void *val,
     161             :                                          size_t nval)
     162             : {
     163           0 :         const void *pointer;
     164           0 :         size_t length;
     165             : 
     166           0 :         if (!val)
     167           0 :                 return property_entry_count_elems_of_size(props, name,
     168             :                                                           elem_size);
     169             : 
     170           0 :         if (!is_power_of_2(elem_size) || elem_size > sizeof(u64))
     171             :                 return -ENXIO;
     172             : 
     173           0 :         length = nval * elem_size;
     174             : 
     175           0 :         pointer = property_entry_find(props, name, length);
     176           0 :         if (IS_ERR(pointer))
     177           0 :                 return PTR_ERR(pointer);
     178             : 
     179           0 :         memcpy(val, pointer, length);
     180           0 :         return 0;
     181             : }
     182             : 
     183           0 : static int property_entry_read_string_array(const struct property_entry *props,
     184             :                                             const char *propname,
     185             :                                             const char **strings, size_t nval)
     186             : {
     187           0 :         const void *pointer;
     188           0 :         size_t length;
     189           0 :         int array_len;
     190             : 
     191             :         /* Find out the array length. */
     192           0 :         array_len = property_entry_count_elems_of_size(props, propname,
     193             :                                                        sizeof(const char *));
     194           0 :         if (array_len < 0)
     195           0 :                 return array_len;
     196             : 
     197             :         /* Return how many there are if strings is NULL. */
     198           0 :         if (!strings)
     199             :                 return array_len;
     200             : 
     201           0 :         array_len = min_t(size_t, nval, array_len);
     202           0 :         length = array_len * sizeof(*strings);
     203             : 
     204           0 :         pointer = property_entry_find(props, propname, length);
     205           0 :         if (IS_ERR(pointer))
     206           0 :                 return PTR_ERR(pointer);
     207             : 
     208           0 :         memcpy(strings, pointer, length);
     209             : 
     210           0 :         return array_len;
     211             : }
     212             : 
     213           0 : static void property_entry_free_data(const struct property_entry *p)
     214             : {
     215           0 :         const char * const *src_str;
     216           0 :         size_t i, nval;
     217             : 
     218           0 :         if (p->type == DEV_PROP_STRING) {
     219           0 :                 src_str = property_get_pointer(p);
     220           0 :                 nval = p->length / sizeof(*src_str);
     221           0 :                 for (i = 0; i < nval; i++)
     222           0 :                         kfree(src_str[i]);
     223             :         }
     224             : 
     225           0 :         if (!p->is_inline)
     226           0 :                 kfree(p->pointer);
     227             : 
     228           0 :         kfree(p->name);
     229           0 : }
     230             : 
     231           0 : static bool property_copy_string_array(const char **dst_ptr,
     232             :                                        const char * const *src_ptr,
     233             :                                        size_t nval)
     234             : {
     235           0 :         int i;
     236             : 
     237           0 :         for (i = 0; i < nval; i++) {
     238           0 :                 dst_ptr[i] = kstrdup(src_ptr[i], GFP_KERNEL);
     239           0 :                 if (!dst_ptr[i] && src_ptr[i]) {
     240           0 :                         while (--i >= 0)
     241           0 :                                 kfree(dst_ptr[i]);
     242             :                         return false;
     243             :                 }
     244             :         }
     245             : 
     246             :         return true;
     247             : }
     248             : 
     249           0 : static int property_entry_copy_data(struct property_entry *dst,
     250             :                                     const struct property_entry *src)
     251             : {
     252           0 :         const void *pointer = property_get_pointer(src);
     253           0 :         void *dst_ptr;
     254           0 :         size_t nval;
     255             : 
     256             :         /*
     257             :          * Properties with no data should not be marked as stored
     258             :          * out of line.
     259             :          */
     260           0 :         if (!src->is_inline && !src->length)
     261             :                 return -ENODATA;
     262             : 
     263             :         /*
     264             :          * Reference properties are never stored inline as
     265             :          * they are too big.
     266             :          */
     267           0 :         if (src->type == DEV_PROP_REF && src->is_inline)
     268             :                 return -EINVAL;
     269             : 
     270           0 :         if (src->length <= sizeof(dst->value)) {
     271           0 :                 dst_ptr = &dst->value;
     272           0 :                 dst->is_inline = true;
     273             :         } else {
     274           0 :                 dst_ptr = kmalloc(src->length, GFP_KERNEL);
     275           0 :                 if (!dst_ptr)
     276             :                         return -ENOMEM;
     277           0 :                 dst->pointer = dst_ptr;
     278             :         }
     279             : 
     280           0 :         if (src->type == DEV_PROP_STRING) {
     281           0 :                 nval = src->length / sizeof(const char *);
     282           0 :                 if (!property_copy_string_array(dst_ptr, pointer, nval)) {
     283           0 :                         if (!dst->is_inline)
     284           0 :                                 kfree(dst->pointer);
     285           0 :                         return -ENOMEM;
     286             :                 }
     287             :         } else {
     288           0 :                 memcpy(dst_ptr, pointer, src->length);
     289             :         }
     290             : 
     291           0 :         dst->length = src->length;
     292           0 :         dst->type = src->type;
     293           0 :         dst->name = kstrdup(src->name, GFP_KERNEL);
     294           0 :         if (!dst->name) {
     295           0 :                 property_entry_free_data(dst);
     296           0 :                 return -ENOMEM;
     297             :         }
     298             : 
     299             :         return 0;
     300             : }
     301             : 
     302             : /**
     303             :  * property_entries_dup - duplicate array of properties
     304             :  * @properties: array of properties to copy
     305             :  *
     306             :  * This function creates a deep copy of the given NULL-terminated array
     307             :  * of property entries.
     308             :  */
     309             : struct property_entry *
     310           0 : property_entries_dup(const struct property_entry *properties)
     311             : {
     312           0 :         struct property_entry *p;
     313           0 :         int i, n = 0;
     314           0 :         int ret;
     315             : 
     316           0 :         if (!properties)
     317             :                 return NULL;
     318             : 
     319           0 :         while (properties[n].name)
     320           0 :                 n++;
     321             : 
     322           0 :         p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
     323           0 :         if (!p)
     324           0 :                 return ERR_PTR(-ENOMEM);
     325             : 
     326           0 :         for (i = 0; i < n; i++) {
     327           0 :                 ret = property_entry_copy_data(&p[i], &properties[i]);
     328           0 :                 if (ret) {
     329           0 :                         while (--i >= 0)
     330           0 :                                 property_entry_free_data(&p[i]);
     331           0 :                         kfree(p);
     332           0 :                         return ERR_PTR(ret);
     333             :                 }
     334             :         }
     335             : 
     336             :         return p;
     337             : }
     338             : EXPORT_SYMBOL_GPL(property_entries_dup);
     339             : 
     340             : /**
     341             :  * property_entries_free - free previously allocated array of properties
     342             :  * @properties: array of properties to destroy
     343             :  *
     344             :  * This function frees given NULL-terminated array of property entries,
     345             :  * along with their data.
     346             :  */
     347           0 : void property_entries_free(const struct property_entry *properties)
     348             : {
     349           0 :         const struct property_entry *p;
     350             : 
     351           0 :         if (!properties)
     352             :                 return;
     353             : 
     354           0 :         for (p = properties; p->name; p++)
     355           0 :                 property_entry_free_data(p);
     356             : 
     357           0 :         kfree(properties);
     358             : }
     359             : EXPORT_SYMBOL_GPL(property_entries_free);
     360             : 
     361             : /* -------------------------------------------------------------------------- */
     362             : /* fwnode operations */
     363             : 
     364           0 : static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
     365             : {
     366           0 :         struct swnode *swnode = to_swnode(fwnode);
     367             : 
     368           0 :         kobject_get(&swnode->kobj);
     369             : 
     370           0 :         return &swnode->fwnode;
     371             : }
     372             : 
     373           0 : static void software_node_put(struct fwnode_handle *fwnode)
     374             : {
     375           0 :         struct swnode *swnode = to_swnode(fwnode);
     376             : 
     377           0 :         kobject_put(&swnode->kobj);
     378           0 : }
     379             : 
     380           0 : static bool software_node_property_present(const struct fwnode_handle *fwnode,
     381             :                                            const char *propname)
     382             : {
     383           0 :         struct swnode *swnode = to_swnode(fwnode);
     384             : 
     385           0 :         return !!property_entry_get(swnode->node->properties, propname);
     386             : }
     387             : 
     388           0 : static int software_node_read_int_array(const struct fwnode_handle *fwnode,
     389             :                                         const char *propname,
     390             :                                         unsigned int elem_size, void *val,
     391             :                                         size_t nval)
     392             : {
     393           0 :         struct swnode *swnode = to_swnode(fwnode);
     394             : 
     395           0 :         return property_entry_read_int_array(swnode->node->properties, propname,
     396             :                                              elem_size, val, nval);
     397             : }
     398             : 
     399           0 : static int software_node_read_string_array(const struct fwnode_handle *fwnode,
     400             :                                            const char *propname,
     401             :                                            const char **val, size_t nval)
     402             : {
     403           0 :         struct swnode *swnode = to_swnode(fwnode);
     404             : 
     405           0 :         return property_entry_read_string_array(swnode->node->properties,
     406             :                                                 propname, val, nval);
     407             : }
     408             : 
     409             : static const char *
     410           0 : software_node_get_name(const struct fwnode_handle *fwnode)
     411             : {
     412           0 :         const struct swnode *swnode = to_swnode(fwnode);
     413             : 
     414           0 :         if (!swnode)
     415             :                 return "(null)";
     416             : 
     417           0 :         return kobject_name(&swnode->kobj);
     418             : }
     419             : 
     420             : static const char *
     421           0 : software_node_get_name_prefix(const struct fwnode_handle *fwnode)
     422             : {
     423           0 :         struct fwnode_handle *parent;
     424           0 :         const char *prefix;
     425             : 
     426           0 :         parent = fwnode_get_parent(fwnode);
     427           0 :         if (!parent)
     428             :                 return "";
     429             : 
     430             :         /* Figure out the prefix from the parents. */
     431           0 :         while (is_software_node(parent))
     432           0 :                 parent = fwnode_get_next_parent(parent);
     433             : 
     434           0 :         prefix = fwnode_get_name_prefix(parent);
     435           0 :         fwnode_handle_put(parent);
     436             : 
     437             :         /* Guess something if prefix was NULL. */
     438           0 :         return prefix ?: "/";
     439             : }
     440             : 
     441             : static struct fwnode_handle *
     442           0 : software_node_get_parent(const struct fwnode_handle *fwnode)
     443             : {
     444           0 :         struct swnode *swnode = to_swnode(fwnode);
     445             : 
     446           0 :         if (!swnode || !swnode->parent)
     447             :                 return NULL;
     448             : 
     449           0 :         return fwnode_handle_get(&swnode->parent->fwnode);
     450             : }
     451             : 
     452             : static struct fwnode_handle *
     453           0 : software_node_get_next_child(const struct fwnode_handle *fwnode,
     454             :                              struct fwnode_handle *child)
     455             : {
     456           0 :         struct swnode *p = to_swnode(fwnode);
     457           0 :         struct swnode *c = to_swnode(child);
     458             : 
     459           0 :         if (!p || list_empty(&p->children) ||
     460           0 :             (c && list_is_last(&c->entry, &p->children))) {
     461           0 :                 fwnode_handle_put(child);
     462           0 :                 return NULL;
     463             :         }
     464             : 
     465           0 :         if (c)
     466           0 :                 c = list_next_entry(c, entry);
     467             :         else
     468           0 :                 c = list_first_entry(&p->children, struct swnode, entry);
     469             : 
     470           0 :         fwnode_handle_put(child);
     471           0 :         return fwnode_handle_get(&c->fwnode);
     472             : }
     473             : 
     474             : static struct fwnode_handle *
     475           0 : software_node_get_named_child_node(const struct fwnode_handle *fwnode,
     476             :                                    const char *childname)
     477             : {
     478           0 :         struct swnode *swnode = to_swnode(fwnode);
     479           0 :         struct swnode *child;
     480             : 
     481           0 :         if (!swnode || list_empty(&swnode->children))
     482             :                 return NULL;
     483             : 
     484           0 :         list_for_each_entry(child, &swnode->children, entry) {
     485           0 :                 if (!strcmp(childname, kobject_name(&child->kobj))) {
     486           0 :                         kobject_get(&child->kobj);
     487           0 :                         return &child->fwnode;
     488             :                 }
     489             :         }
     490             :         return NULL;
     491             : }
     492             : 
     493             : static int
     494           0 : software_node_get_reference_args(const struct fwnode_handle *fwnode,
     495             :                                  const char *propname, const char *nargs_prop,
     496             :                                  unsigned int nargs, unsigned int index,
     497             :                                  struct fwnode_reference_args *args)
     498             : {
     499           0 :         struct swnode *swnode = to_swnode(fwnode);
     500           0 :         const struct software_node_ref_args *ref_array;
     501           0 :         const struct software_node_ref_args *ref;
     502           0 :         const struct property_entry *prop;
     503           0 :         struct fwnode_handle *refnode;
     504           0 :         u32 nargs_prop_val;
     505           0 :         int error;
     506           0 :         int i;
     507             : 
     508           0 :         if (!swnode)
     509             :                 return -ENOENT;
     510             : 
     511           0 :         prop = property_entry_get(swnode->node->properties, propname);
     512           0 :         if (!prop)
     513             :                 return -ENOENT;
     514             : 
     515           0 :         if (prop->type != DEV_PROP_REF)
     516             :                 return -EINVAL;
     517             : 
     518             :         /*
     519             :          * We expect that references are never stored inline, even
     520             :          * single ones, as they are too big.
     521             :          */
     522           0 :         if (prop->is_inline)
     523             :                 return -EINVAL;
     524             : 
     525           0 :         if (index * sizeof(*ref) >= prop->length)
     526             :                 return -ENOENT;
     527             : 
     528           0 :         ref_array = prop->pointer;
     529           0 :         ref = &ref_array[index];
     530             : 
     531           0 :         refnode = software_node_fwnode(ref->node);
     532           0 :         if (!refnode)
     533             :                 return -ENOENT;
     534             : 
     535           0 :         if (nargs_prop) {
     536           0 :                 error = property_entry_read_int_array(swnode->node->properties,
     537             :                                                       nargs_prop, sizeof(u32),
     538             :                                                       &nargs_prop_val, 1);
     539           0 :                 if (error)
     540             :                         return error;
     541             : 
     542           0 :                 nargs = nargs_prop_val;
     543             :         }
     544             : 
     545           0 :         if (nargs > NR_FWNODE_REFERENCE_ARGS)
     546             :                 return -EINVAL;
     547             : 
     548           0 :         args->fwnode = software_node_get(refnode);
     549           0 :         args->nargs = nargs;
     550             : 
     551           0 :         for (i = 0; i < nargs; i++)
     552           0 :                 args->args[i] = ref->args[i];
     553             : 
     554             :         return 0;
     555             : }
     556             : 
     557             : static struct fwnode_handle *
     558           0 : swnode_graph_find_next_port(const struct fwnode_handle *parent,
     559             :                             struct fwnode_handle *port)
     560             : {
     561           0 :         struct fwnode_handle *old = port;
     562             : 
     563           0 :         while ((port = software_node_get_next_child(parent, old))) {
     564             :                 /*
     565             :                  * fwnode ports have naming style "port@", so we search for any
     566             :                  * children that follow that convention.
     567             :                  */
     568           0 :                 if (!strncmp(to_swnode(port)->node->name, "port@",
     569             :                              strlen("port@")))
     570           0 :                         return port;
     571             :                 old = port;
     572             :         }
     573             : 
     574             :         return NULL;
     575             : }
     576             : 
     577             : static struct fwnode_handle *
     578           0 : software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
     579             :                                       struct fwnode_handle *endpoint)
     580             : {
     581           0 :         struct swnode *swnode = to_swnode(fwnode);
     582           0 :         struct fwnode_handle *parent;
     583           0 :         struct fwnode_handle *port;
     584             : 
     585           0 :         if (!swnode)
     586             :                 return NULL;
     587             : 
     588           0 :         if (endpoint) {
     589           0 :                 port = software_node_get_parent(endpoint);
     590           0 :                 parent = software_node_get_parent(port);
     591             :         } else {
     592           0 :                 parent = software_node_get_named_child_node(fwnode, "ports");
     593           0 :                 if (!parent)
     594           0 :                         parent = software_node_get(&swnode->fwnode);
     595             : 
     596           0 :                 port = swnode_graph_find_next_port(parent, NULL);
     597             :         }
     598             : 
     599           0 :         for (; port; port = swnode_graph_find_next_port(parent, port)) {
     600           0 :                 endpoint = software_node_get_next_child(port, endpoint);
     601           0 :                 if (endpoint) {
     602           0 :                         fwnode_handle_put(port);
     603           0 :                         break;
     604             :                 }
     605             :         }
     606             : 
     607           0 :         fwnode_handle_put(parent);
     608             : 
     609           0 :         return endpoint;
     610             : }
     611             : 
     612             : static struct fwnode_handle *
     613           0 : software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
     614             : {
     615           0 :         struct swnode *swnode = to_swnode(fwnode);
     616           0 :         const struct software_node_ref_args *ref;
     617           0 :         const struct property_entry *prop;
     618             : 
     619           0 :         if (!swnode)
     620             :                 return NULL;
     621             : 
     622           0 :         prop = property_entry_get(swnode->node->properties, "remote-endpoint");
     623           0 :         if (!prop || prop->type != DEV_PROP_REF || prop->is_inline)
     624             :                 return NULL;
     625             : 
     626           0 :         ref = prop->pointer;
     627             : 
     628           0 :         return software_node_get(software_node_fwnode(ref[0].node));
     629             : }
     630             : 
     631             : static struct fwnode_handle *
     632           0 : software_node_graph_get_port_parent(struct fwnode_handle *fwnode)
     633             : {
     634           0 :         struct swnode *swnode = to_swnode(fwnode);
     635             : 
     636           0 :         swnode = swnode->parent;
     637           0 :         if (swnode && !strcmp(swnode->node->name, "ports"))
     638           0 :                 swnode = swnode->parent;
     639             : 
     640           0 :         return swnode ? software_node_get(&swnode->fwnode) : NULL;
     641             : }
     642             : 
     643             : static int
     644           0 : software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
     645             :                                    struct fwnode_endpoint *endpoint)
     646             : {
     647           0 :         struct swnode *swnode = to_swnode(fwnode);
     648           0 :         const char *parent_name = swnode->parent->node->name;
     649           0 :         int ret;
     650             : 
     651           0 :         if (strlen("port@") >= strlen(parent_name) ||
     652           0 :             strncmp(parent_name, "port@", strlen("port@")))
     653             :                 return -EINVAL;
     654             : 
     655             :         /* Ports have naming style "port@n", we need to select the n */
     656           0 :         ret = kstrtou32(parent_name + strlen("port@"), 10, &endpoint->port);
     657           0 :         if (ret)
     658             :                 return ret;
     659             : 
     660           0 :         endpoint->id = swnode->id;
     661           0 :         endpoint->local_fwnode = fwnode;
     662             : 
     663           0 :         return 0;
     664             : }
     665             : 
     666             : static const struct fwnode_operations software_node_ops = {
     667             :         .get = software_node_get,
     668             :         .put = software_node_put,
     669             :         .property_present = software_node_property_present,
     670             :         .property_read_int_array = software_node_read_int_array,
     671             :         .property_read_string_array = software_node_read_string_array,
     672             :         .get_name = software_node_get_name,
     673             :         .get_name_prefix = software_node_get_name_prefix,
     674             :         .get_parent = software_node_get_parent,
     675             :         .get_next_child_node = software_node_get_next_child,
     676             :         .get_named_child_node = software_node_get_named_child_node,
     677             :         .get_reference_args = software_node_get_reference_args,
     678             :         .graph_get_next_endpoint = software_node_graph_get_next_endpoint,
     679             :         .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint,
     680             :         .graph_get_port_parent = software_node_graph_get_port_parent,
     681             :         .graph_parse_endpoint = software_node_graph_parse_endpoint,
     682             : };
     683             : 
     684             : /* -------------------------------------------------------------------------- */
     685             : 
     686             : /**
     687             :  * software_node_find_by_name - Find software node by name
     688             :  * @parent: Parent of the software node
     689             :  * @name: Name of the software node
     690             :  *
     691             :  * The function will find a node that is child of @parent and that is named
     692             :  * @name. If no node is found, the function returns NULL.
     693             :  *
     694             :  * NOTE: you will need to drop the reference with fwnode_handle_put() after use.
     695             :  */
     696             : const struct software_node *
     697           0 : software_node_find_by_name(const struct software_node *parent, const char *name)
     698             : {
     699           0 :         struct swnode *swnode = NULL;
     700           0 :         struct kobject *k;
     701             : 
     702           0 :         if (!name)
     703             :                 return NULL;
     704             : 
     705           0 :         spin_lock(&swnode_kset->list_lock);
     706             : 
     707           0 :         list_for_each_entry(k, &swnode_kset->list, entry) {
     708           0 :                 swnode = kobj_to_swnode(k);
     709           0 :                 if (parent == swnode->node->parent && swnode->node->name &&
     710           0 :                     !strcmp(name, swnode->node->name)) {
     711           0 :                         kobject_get(&swnode->kobj);
     712           0 :                         break;
     713             :                 }
     714           0 :                 swnode = NULL;
     715             :         }
     716             : 
     717           0 :         spin_unlock(&swnode_kset->list_lock);
     718             : 
     719           0 :         return swnode ? swnode->node : NULL;
     720             : }
     721             : EXPORT_SYMBOL_GPL(software_node_find_by_name);
     722             : 
     723             : static int
     724           0 : software_node_register_properties(struct software_node *node,
     725             :                                   const struct property_entry *properties)
     726             : {
     727           0 :         struct property_entry *props;
     728             : 
     729           0 :         props = property_entries_dup(properties);
     730           0 :         if (IS_ERR(props))
     731           0 :                 return PTR_ERR(props);
     732             : 
     733           0 :         node->properties = props;
     734             : 
     735           0 :         return 0;
     736             : }
     737             : 
     738           0 : static void software_node_release(struct kobject *kobj)
     739             : {
     740           0 :         struct swnode *swnode = kobj_to_swnode(kobj);
     741             : 
     742           0 :         if (swnode->parent) {
     743           0 :                 ida_simple_remove(&swnode->parent->child_ids, swnode->id);
     744           0 :                 list_del(&swnode->entry);
     745             :         } else {
     746           0 :                 ida_simple_remove(&swnode_root_ids, swnode->id);
     747             :         }
     748             : 
     749           0 :         if (swnode->allocated) {
     750           0 :                 property_entries_free(swnode->node->properties);
     751           0 :                 kfree(swnode->node);
     752             :         }
     753           0 :         ida_destroy(&swnode->child_ids);
     754           0 :         kfree(swnode);
     755           0 : }
     756             : 
     757             : static struct kobj_type software_node_type = {
     758             :         .release = software_node_release,
     759             :         .sysfs_ops = &kobj_sysfs_ops,
     760             : };
     761             : 
     762             : static struct fwnode_handle *
     763           0 : swnode_register(const struct software_node *node, struct swnode *parent,
     764             :                 unsigned int allocated)
     765             : {
     766           0 :         struct swnode *swnode;
     767           0 :         int ret;
     768             : 
     769           0 :         swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
     770           0 :         if (!swnode) {
     771           0 :                 ret = -ENOMEM;
     772           0 :                 goto out_err;
     773             :         }
     774             : 
     775           0 :         ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
     776             :                              0, 0, GFP_KERNEL);
     777           0 :         if (ret < 0) {
     778           0 :                 kfree(swnode);
     779           0 :                 goto out_err;
     780             :         }
     781             : 
     782           0 :         swnode->id = ret;
     783           0 :         swnode->node = node;
     784           0 :         swnode->parent = parent;
     785           0 :         swnode->allocated = allocated;
     786           0 :         swnode->kobj.kset = swnode_kset;
     787           0 :         fwnode_init(&swnode->fwnode, &software_node_ops);
     788             : 
     789           0 :         ida_init(&swnode->child_ids);
     790           0 :         INIT_LIST_HEAD(&swnode->entry);
     791           0 :         INIT_LIST_HEAD(&swnode->children);
     792             : 
     793           0 :         if (node->name)
     794           0 :                 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
     795             :                                            parent ? &parent->kobj : NULL,
     796             :                                            "%s", node->name);
     797             :         else
     798           0 :                 ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
     799             :                                            parent ? &parent->kobj : NULL,
     800             :                                            "node%d", swnode->id);
     801           0 :         if (ret) {
     802           0 :                 kobject_put(&swnode->kobj);
     803           0 :                 return ERR_PTR(ret);
     804             :         }
     805             : 
     806           0 :         if (parent)
     807           0 :                 list_add_tail(&swnode->entry, &parent->children);
     808             : 
     809           0 :         kobject_uevent(&swnode->kobj, KOBJ_ADD);
     810           0 :         return &swnode->fwnode;
     811             : 
     812           0 : out_err:
     813           0 :         if (allocated)
     814           0 :                 property_entries_free(node->properties);
     815           0 :         return ERR_PTR(ret);
     816             : }
     817             : 
     818             : /**
     819             :  * software_node_register_nodes - Register an array of software nodes
     820             :  * @nodes: Zero terminated array of software nodes to be registered
     821             :  *
     822             :  * Register multiple software nodes at once. If any node in the array
     823             :  * has its .parent pointer set (which can only be to another software_node),
     824             :  * then its parent **must** have been registered before it is; either outside
     825             :  * of this function or by ordering the array such that parent comes before
     826             :  * child.
     827             :  */
     828           0 : int software_node_register_nodes(const struct software_node *nodes)
     829             : {
     830           0 :         int ret;
     831           0 :         int i;
     832             : 
     833           0 :         for (i = 0; nodes[i].name; i++) {
     834           0 :                 const struct software_node *parent = nodes[i].parent;
     835             : 
     836           0 :                 if (parent && !software_node_to_swnode(parent)) {
     837           0 :                         ret = -EINVAL;
     838           0 :                         goto err_unregister_nodes;
     839             :                 }
     840             : 
     841           0 :                 ret = software_node_register(&nodes[i]);
     842           0 :                 if (ret)
     843           0 :                         goto err_unregister_nodes;
     844             :         }
     845             : 
     846             :         return 0;
     847             : 
     848           0 : err_unregister_nodes:
     849           0 :         software_node_unregister_nodes(nodes);
     850           0 :         return ret;
     851             : }
     852             : EXPORT_SYMBOL_GPL(software_node_register_nodes);
     853             : 
     854             : /**
     855             :  * software_node_unregister_nodes - Unregister an array of software nodes
     856             :  * @nodes: Zero terminated array of software nodes to be unregistered
     857             :  *
     858             :  * Unregister multiple software nodes at once. If parent pointers are set up
     859             :  * in any of the software nodes then the array **must** be ordered such that
     860             :  * parents come before their children.
     861             :  *
     862             :  * NOTE: If you are uncertain whether the array is ordered such that
     863             :  * parents will be unregistered before their children, it is wiser to
     864             :  * remove the nodes individually, in the correct order (child before
     865             :  * parent).
     866             :  */
     867           0 : void software_node_unregister_nodes(const struct software_node *nodes)
     868             : {
     869           0 :         unsigned int i = 0;
     870             : 
     871           0 :         while (nodes[i].name)
     872           0 :                 i++;
     873             : 
     874           0 :         while (i--)
     875           0 :                 software_node_unregister(&nodes[i]);
     876           0 : }
     877             : EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
     878             : 
     879             : /**
     880             :  * software_node_register_node_group - Register a group of software nodes
     881             :  * @node_group: NULL terminated array of software node pointers to be registered
     882             :  *
     883             :  * Register multiple software nodes at once.
     884             :  */
     885           0 : int software_node_register_node_group(const struct software_node **node_group)
     886             : {
     887           0 :         unsigned int i;
     888           0 :         int ret;
     889             : 
     890           0 :         if (!node_group)
     891             :                 return 0;
     892             : 
     893           0 :         for (i = 0; node_group[i]; i++) {
     894           0 :                 ret = software_node_register(node_group[i]);
     895           0 :                 if (ret) {
     896           0 :                         software_node_unregister_node_group(node_group);
     897           0 :                         return ret;
     898             :                 }
     899             :         }
     900             : 
     901             :         return 0;
     902             : }
     903             : EXPORT_SYMBOL_GPL(software_node_register_node_group);
     904             : 
     905             : /**
     906             :  * software_node_unregister_node_group - Unregister a group of software nodes
     907             :  * @node_group: NULL terminated array of software node pointers to be unregistered
     908             :  *
     909             :  * Unregister multiple software nodes at once. The array will be unwound in
     910             :  * reverse order (i.e. last entry first) and thus if any members of the array are
     911             :  * children of another member then the children must appear later in the list such
     912             :  * that they are unregistered first.
     913             :  */
     914           0 : void software_node_unregister_node_group(
     915             :                 const struct software_node **node_group)
     916             : {
     917           0 :         unsigned int i = 0;
     918             : 
     919           0 :         if (!node_group)
     920             :                 return;
     921             : 
     922           0 :         while (node_group[i])
     923           0 :                 i++;
     924             : 
     925           0 :         while (i--)
     926           0 :                 software_node_unregister(node_group[i]);
     927             : }
     928             : EXPORT_SYMBOL_GPL(software_node_unregister_node_group);
     929             : 
     930             : /**
     931             :  * software_node_register - Register static software node
     932             :  * @node: The software node to be registered
     933             :  */
     934           0 : int software_node_register(const struct software_node *node)
     935             : {
     936           0 :         struct swnode *parent = software_node_to_swnode(node->parent);
     937             : 
     938           0 :         if (software_node_to_swnode(node))
     939             :                 return -EEXIST;
     940             : 
     941           0 :         if (node->parent && !parent)
     942             :                 return -EINVAL;
     943             : 
     944           0 :         return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
     945             : }
     946             : EXPORT_SYMBOL_GPL(software_node_register);
     947             : 
     948             : /**
     949             :  * software_node_unregister - Unregister static software node
     950             :  * @node: The software node to be unregistered
     951             :  */
     952           0 : void software_node_unregister(const struct software_node *node)
     953             : {
     954           0 :         struct swnode *swnode;
     955             : 
     956           0 :         swnode = software_node_to_swnode(node);
     957           0 :         if (swnode)
     958           0 :                 fwnode_remove_software_node(&swnode->fwnode);
     959           0 : }
     960             : EXPORT_SYMBOL_GPL(software_node_unregister);
     961             : 
     962             : struct fwnode_handle *
     963           0 : fwnode_create_software_node(const struct property_entry *properties,
     964             :                             const struct fwnode_handle *parent)
     965             : {
     966           0 :         struct software_node *node;
     967           0 :         struct swnode *p = NULL;
     968           0 :         int ret;
     969             : 
     970           0 :         if (parent) {
     971           0 :                 if (IS_ERR(parent))
     972           0 :                         return ERR_CAST(parent);
     973           0 :                 if (!is_software_node(parent))
     974           0 :                         return ERR_PTR(-EINVAL);
     975           0 :                 p = to_swnode(parent);
     976             :         }
     977             : 
     978           0 :         node = kzalloc(sizeof(*node), GFP_KERNEL);
     979           0 :         if (!node)
     980           0 :                 return ERR_PTR(-ENOMEM);
     981             : 
     982           0 :         ret = software_node_register_properties(node, properties);
     983           0 :         if (ret) {
     984           0 :                 kfree(node);
     985           0 :                 return ERR_PTR(ret);
     986             :         }
     987             : 
     988           0 :         node->parent = p ? p->node : NULL;
     989             : 
     990           0 :         return swnode_register(node, p, 1);
     991             : }
     992             : EXPORT_SYMBOL_GPL(fwnode_create_software_node);
     993             : 
     994           0 : void fwnode_remove_software_node(struct fwnode_handle *fwnode)
     995             : {
     996           0 :         struct swnode *swnode = to_swnode(fwnode);
     997             : 
     998           0 :         if (!swnode)
     999             :                 return;
    1000             : 
    1001           0 :         kobject_put(&swnode->kobj);
    1002             : }
    1003             : EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
    1004             : 
    1005             : /**
    1006             :  * device_add_software_node - Assign software node to a device
    1007             :  * @dev: The device the software node is meant for.
    1008             :  * @node: The software node.
    1009             :  *
    1010             :  * This function will make @node the secondary firmware node pointer of @dev. If
    1011             :  * @dev has no primary node, then @node will become the primary node. The
    1012             :  * function will register @node automatically if it wasn't already registered.
    1013             :  */
    1014           0 : int device_add_software_node(struct device *dev, const struct software_node *node)
    1015             : {
    1016           0 :         struct swnode *swnode;
    1017           0 :         int ret;
    1018             : 
    1019             :         /* Only one software node per device. */
    1020           0 :         if (dev_to_swnode(dev))
    1021             :                 return -EBUSY;
    1022             : 
    1023           0 :         swnode = software_node_to_swnode(node);
    1024           0 :         if (swnode) {
    1025           0 :                 kobject_get(&swnode->kobj);
    1026             :         } else {
    1027           0 :                 ret = software_node_register(node);
    1028           0 :                 if (ret)
    1029             :                         return ret;
    1030             : 
    1031           0 :                 swnode = software_node_to_swnode(node);
    1032             :         }
    1033             : 
    1034           0 :         set_secondary_fwnode(dev, &swnode->fwnode);
    1035             : 
    1036           0 :         return 0;
    1037             : }
    1038             : EXPORT_SYMBOL_GPL(device_add_software_node);
    1039             : 
    1040             : /**
    1041             :  * device_remove_software_node - Remove device's software node
    1042             :  * @dev: The device with the software node.
    1043             :  *
    1044             :  * This function will unregister the software node of @dev.
    1045             :  */
    1046           0 : void device_remove_software_node(struct device *dev)
    1047             : {
    1048           0 :         struct swnode *swnode;
    1049             : 
    1050           0 :         swnode = dev_to_swnode(dev);
    1051           0 :         if (!swnode)
    1052             :                 return;
    1053             : 
    1054           0 :         software_node_notify(dev, KOBJ_REMOVE);
    1055           0 :         set_secondary_fwnode(dev, NULL);
    1056           0 :         kobject_put(&swnode->kobj);
    1057             : }
    1058             : EXPORT_SYMBOL_GPL(device_remove_software_node);
    1059             : 
    1060             : /**
    1061             :  * device_create_managed_software_node - Create a software node for a device
    1062             :  * @dev: The device the software node is assigned to.
    1063             :  * @properties: Device properties for the software node.
    1064             :  * @parent: Parent of the software node.
    1065             :  *
    1066             :  * Creates a software node as a managed resource for @dev, which means the
    1067             :  * lifetime of the newly created software node is tied to the lifetime of @dev.
    1068             :  * Software nodes created with this function should not be reused or shared
    1069             :  * because of that. The function takes a deep copy of @properties for the
    1070             :  * software node.
    1071             :  *
    1072             :  * Since the new software node is assigned directly to @dev, and since it should
    1073             :  * not be shared, it is not returned to the caller. The function returns 0 on
    1074             :  * success, and errno in case of an error.
    1075             :  */
    1076           0 : int device_create_managed_software_node(struct device *dev,
    1077             :                                         const struct property_entry *properties,
    1078             :                                         const struct software_node *parent)
    1079             : {
    1080           0 :         struct fwnode_handle *p = software_node_fwnode(parent);
    1081           0 :         struct fwnode_handle *fwnode;
    1082             : 
    1083           0 :         if (parent && !p)
    1084             :                 return -EINVAL;
    1085             : 
    1086           0 :         fwnode = fwnode_create_software_node(properties, p);
    1087           0 :         if (IS_ERR(fwnode))
    1088           0 :                 return PTR_ERR(fwnode);
    1089             : 
    1090           0 :         to_swnode(fwnode)->managed = true;
    1091           0 :         set_secondary_fwnode(dev, fwnode);
    1092             : 
    1093           0 :         return 0;
    1094             : }
    1095             : EXPORT_SYMBOL_GPL(device_create_managed_software_node);
    1096             : 
    1097         175 : int software_node_notify(struct device *dev, unsigned long action)
    1098             : {
    1099         175 :         struct swnode *swnode;
    1100         175 :         int ret;
    1101             : 
    1102         175 :         swnode = dev_to_swnode(dev);
    1103         175 :         if (!swnode)
    1104             :                 return 0;
    1105             : 
    1106           0 :         switch (action) {
    1107           0 :         case KOBJ_ADD:
    1108           0 :                 ret = sysfs_create_link(&dev->kobj, &swnode->kobj,
    1109             :                                         "software_node");
    1110           0 :                 if (ret)
    1111             :                         break;
    1112             : 
    1113           0 :                 ret = sysfs_create_link(&swnode->kobj, &dev->kobj,
    1114             :                                         dev_name(dev));
    1115           0 :                 if (ret) {
    1116           0 :                         sysfs_remove_link(&dev->kobj, "software_node");
    1117           0 :                         break;
    1118             :                 }
    1119           0 :                 kobject_get(&swnode->kobj);
    1120           0 :                 break;
    1121             :         case KOBJ_REMOVE:
    1122           0 :                 sysfs_remove_link(&swnode->kobj, dev_name(dev));
    1123           0 :                 sysfs_remove_link(&dev->kobj, "software_node");
    1124           0 :                 kobject_put(&swnode->kobj);
    1125             : 
    1126           0 :                 if (swnode->managed) {
    1127           0 :                         set_secondary_fwnode(dev, NULL);
    1128           0 :                         kobject_put(&swnode->kobj);
    1129             :                 }
    1130             :                 break;
    1131             :         default:
    1132             :                 break;
    1133             :         }
    1134             : 
    1135           0 :         return 0;
    1136             : }
    1137             : 
    1138           1 : static int __init software_node_init(void)
    1139             : {
    1140           1 :         swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
    1141           1 :         if (!swnode_kset)
    1142           0 :                 return -ENOMEM;
    1143             :         return 0;
    1144             : }
    1145             : postcore_initcall(software_node_init);
    1146             : 
    1147           0 : static void __exit software_node_exit(void)
    1148             : {
    1149           0 :         ida_destroy(&swnode_root_ids);
    1150           0 :         kset_unregister(swnode_kset);
    1151           0 : }
    1152             : __exitcall(software_node_exit);

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