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 memcpy(drc_name, buf, nbytes);
38
39 end = strchr(drc_name, '\n');
40 if (!end)
41 end = &drc_name[nbytes];
42 *end = '\0';
43
44 rc = dlpar_add_slot(drc_name);
45 if (rc)
46 return rc;
47
48 return nbytes;
49 }
50
add_slot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)51 static ssize_t add_slot_show(struct kobject *kobj,
52 struct kobj_attribute *attr, char *buf)
53 {
54 return sprintf(buf, "0\n");
55 }
56
remove_slot_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t nbytes)57 static ssize_t remove_slot_store(struct kobject *kobj,
58 struct kobj_attribute *attr,
59 const char *buf, size_t nbytes)
60 {
61 char drc_name[MAX_DRC_NAME_LEN];
62 int rc;
63 char *end;
64
65 if (nbytes >= MAX_DRC_NAME_LEN)
66 return 0;
67
68 memcpy(drc_name, buf, nbytes);
69
70 end = strchr(drc_name, '\n');
71 if (!end)
72 end = &drc_name[nbytes];
73 *end = '\0';
74
75 rc = dlpar_remove_slot(drc_name);
76 if (rc)
77 return rc;
78
79 return nbytes;
80 }
81
remove_slot_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)82 static ssize_t remove_slot_show(struct kobject *kobj,
83 struct kobj_attribute *attr, char *buf)
84 {
85 return sprintf(buf, "0\n");
86 }
87
88 static struct kobj_attribute add_slot_attr =
89 __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store);
90
91 static struct kobj_attribute remove_slot_attr =
92 __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store);
93
94 static struct attribute *default_attrs[] = {
95 &add_slot_attr.attr,
96 &remove_slot_attr.attr,
97 NULL,
98 };
99
100 static const struct attribute_group dlpar_attr_group = {
101 .attrs = default_attrs,
102 };
103
104 static struct kobject *dlpar_kobj;
105
dlpar_sysfs_init(void)106 int dlpar_sysfs_init(void)
107 {
108 int error;
109
110 dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME,
111 &pci_slots_kset->kobj);
112 if (!dlpar_kobj)
113 return -EINVAL;
114
115 error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group);
116 if (error)
117 kobject_put(dlpar_kobj);
118 return error;
119 }
120
dlpar_sysfs_exit(void)121 void dlpar_sysfs_exit(void)
122 {
123 sysfs_remove_group(dlpar_kobj, &dlpar_attr_group);
124 kobject_put(dlpar_kobj);
125 }
126
