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 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 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 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 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; 103 104 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 } 118 119 void dlpar_sysfs_exit(void) 120 { 121 sysfs_remove_group(dlpar_kobj, &dlpar_attr_group); 122 kobject_put(dlpar_kobj); 123 } 124