| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Interface for Dynamic Logical Partitioning of I/O Slots on |
| 3 | * RPA-compliant PPC64 platform. |
| 4 | * |
| 5 | * John Rose <johnrose@austin.ibm.com> |
| 6 | * October 2003 |
| 7 | * |
| 8 | * Copyright (C) 2003 IBM. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | #include <linux/kobject.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/pci.h> |
| 18 | #include <linux/pci_hotplug.h> |
| 19 | #include "rpadlpar.h" |
| 20 | #include "../pci.h" |
| 21 | |
| 22 | #define DLPAR_KOBJ_NAME "control" |
| 23 | |
| 24 | /* Those two have no quotes because they are passed to __ATTR() which |
| 25 | * stringifies the argument (yuck !) |
| 26 | */ |
| 27 | #define ADD_SLOT_ATTR_NAME add_slot |
| 28 | #define REMOVE_SLOT_ATTR_NAME remove_slot |
| 29 | |
| 30 | #define MAX_DRC_NAME_LEN 64 |
| 31 | |
| 32 | static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 33 | const char *buf, size_t nbytes) |
| 34 | { |
| 35 | char drc_name[MAX_DRC_NAME_LEN]; |
| 36 | char *end; |
| 37 | int rc; |
| 38 | |
| 39 | if (nbytes >= MAX_DRC_NAME_LEN) |
| 40 | return 0; |
| 41 | |
| 42 | memcpy(drc_name, buf, nbytes); |
| 43 | |
| 44 | end = strchr(drc_name, '\n'); |
| 45 | if (!end) |
| 46 | end = &drc_name[nbytes]; |
| 47 | *end = '\0'; |
| 48 | |
| 49 | rc = dlpar_add_slot(drc_name); |
| 50 | if (rc) |
| 51 | return rc; |
| 52 | |
| 53 | return nbytes; |
| 54 | } |
| 55 | |
| 56 | static ssize_t add_slot_show(struct kobject *kobj, |
| 57 | struct kobj_attribute *attr, char *buf) |
| 58 | { |
| 59 | return sprintf(buf, "0\n"); |
| 60 | } |
| 61 | |
| 62 | static ssize_t remove_slot_store(struct kobject *kobj, |
| 63 | struct kobj_attribute *attr, |
| 64 | const char *buf, size_t nbytes) |
| 65 | { |
| 66 | char drc_name[MAX_DRC_NAME_LEN]; |
| 67 | int rc; |
| 68 | char *end; |
| 69 | |
| 70 | if (nbytes >= MAX_DRC_NAME_LEN) |
| 71 | return 0; |
| 72 | |
| 73 | memcpy(drc_name, buf, nbytes); |
| 74 | |
| 75 | end = strchr(drc_name, '\n'); |
| 76 | if (!end) |
| 77 | end = &drc_name[nbytes]; |
| 78 | *end = '\0'; |
| 79 | |
| 80 | rc = dlpar_remove_slot(drc_name); |
| 81 | if (rc) |
| 82 | return rc; |
| 83 | |
| 84 | return nbytes; |
| 85 | } |
| 86 | |
| 87 | static ssize_t remove_slot_show(struct kobject *kobj, |
| 88 | struct kobj_attribute *attr, char *buf) |
| 89 | { |
| 90 | return sprintf(buf, "0\n"); |
| 91 | } |
| 92 | |
| 93 | static struct kobj_attribute add_slot_attr = |
| 94 | __ATTR(ADD_SLOT_ATTR_NAME, 0644, add_slot_show, add_slot_store); |
| 95 | |
| 96 | static struct kobj_attribute remove_slot_attr = |
| 97 | __ATTR(REMOVE_SLOT_ATTR_NAME, 0644, remove_slot_show, remove_slot_store); |
| 98 | |
| 99 | static struct attribute *default_attrs[] = { |
| 100 | &add_slot_attr.attr, |
| 101 | &remove_slot_attr.attr, |
| 102 | NULL, |
| 103 | }; |
| 104 | |
| 105 | static struct attribute_group dlpar_attr_group = { |
| 106 | .attrs = default_attrs, |
| 107 | }; |
| 108 | |
| 109 | static struct kobject *dlpar_kobj; |
| 110 | |
| 111 | int dlpar_sysfs_init(void) |
| 112 | { |
| 113 | int error; |
| 114 | |
| 115 | dlpar_kobj = kobject_create_and_add(DLPAR_KOBJ_NAME, |
| 116 | &pci_slots_kset->kobj); |
| 117 | if (!dlpar_kobj) |
| 118 | return -EINVAL; |
| 119 | |
| 120 | error = sysfs_create_group(dlpar_kobj, &dlpar_attr_group); |
| 121 | if (error) |
| 122 | kobject_put(dlpar_kobj); |
| 123 | return error; |
| 124 | } |
| 125 | |
| 126 | void dlpar_sysfs_exit(void) |
| 127 | { |
| 128 | sysfs_remove_group(dlpar_kobj, &dlpar_attr_group); |
| 129 | kobject_put(dlpar_kobj); |
| 130 | } |