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