xref: /openbmc/linux/drivers/pci/hotplug/rpadlpar_sysfs.c (revision 762f99f4f3cb41a775b5157dd761217beba65873)
1  // SPDX-License-Identifier: GPL-2.0+
2  /*
3   * Interface for Dynamic Logical Partitioning of I/O Slots on
4   * RPA-compliant PPC64 platform.
5   *
6   * John Rose <johnrose@austin.ibm.com>
7   * October 2003
8   *
9   * Copyright (C) 2003 IBM.
10   */
11  #include <linux/kobject.h>
12  #include <linux/string.h>
13  #include <linux/pci.h>
14  #include <linux/pci_hotplug.h>
15  #include "rpaphp.h"
16  #include "rpadlpar.h"
17  #include "../pci.h"
18  
19  #define DLPAR_KOBJ_NAME       "control"
20  
21  /* Those two have no quotes because they are passed to __ATTR() which
22   * stringifies the argument (yuck !)
23   */
24  #define ADD_SLOT_ATTR_NAME    add_slot
25  #define REMOVE_SLOT_ATTR_NAME remove_slot
26  
add_slot_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t nbytes)27  static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
28  			      const char *buf, size_t nbytes)
29  {
30  	char drc_name[MAX_DRC_NAME_LEN];
31  	char *end;
32  	int rc;
33  
34  	if (nbytes >= MAX_DRC_NAME_LEN)
35  		return 0;
36  
37  	strscpy(drc_name, buf, nbytes + 1);
38  
39  	end = strchr(drc_name, '\n');
40  	if (end)
41  		*end = '\0';
42  
43  	rc = dlpar_add_slot(drc_name);
44  	if (rc)
45  		return rc;
46  
47  	return nbytes;
48  }
49  
add_slot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)50  static ssize_t add_slot_show(struct kobject *kobj,
51  			     struct kobj_attribute *attr, char *buf)
52  {
53  	return sysfs_emit(buf, "0\n");
54  }
55  
remove_slot_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t nbytes)56  static ssize_t remove_slot_store(struct kobject *kobj,
57  				 struct kobj_attribute *attr,
58  				 const char *buf, size_t nbytes)
59  {
60  	char drc_name[MAX_DRC_NAME_LEN];
61  	int rc;
62  	char *end;
63  
64  	if (nbytes >= MAX_DRC_NAME_LEN)
65  		return 0;
66  
67  	strscpy(drc_name, buf, nbytes + 1);
68  
69  	end = strchr(drc_name, '\n');
70  	if (end)
71  		*end = '\0';
72  
73  	rc = dlpar_remove_slot(drc_name);
74  	if (rc)
75  		return rc;
76  
77  	return nbytes;
78  }
79  
remove_slot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)80  static ssize_t remove_slot_show(struct kobject *kobj,
81  				struct kobj_attribute *attr, char *buf)
82  {
83  	return sysfs_emit(buf, "0\n");
84  }
85  
86  static struct kobj_attribute add_slot_attr =
87  	__ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
88  
89  static struct kobj_attribute remove_slot_attr =
90  	__ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
91  
92  static struct attribute *default_attrs[] = {
93  	&add_slot_attr.attr,
94  	&remove_slot_attr.attr,
95  	NULL,
96  };
97  
98  static const struct attribute_group dlpar_attr_group = {
99  	.attrs = default_attrs,
100  };
101  
102  static struct kobject *dlpar_kobj;
103  
dlpar_sysfs_init(void)104  int dlpar_sysfs_init(void)
105  {
106  	int error;
107  
108  	dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
109  					    &pci_slots_kset->kobj);
110  	if (!dlpar_kobj)
111  		return -EINVAL;
112  
113  	error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
114  	if (error)
115  		kobject_put(dlpar_kobj);
116  	return error;
117  }
118  
dlpar_sysfs_exit(void)119  void dlpar_sysfs_exit(void)
120  {
121  	sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
122  	kobject_put(dlpar_kobj);
123  }
124