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18#define pr_fmt(fmt) "apple-properties: " fmt
19
20#include <linux/bootmem.h>
21#include <linux/dmi.h>
22#include <linux/efi.h>
23#include <linux/property.h>
24#include <linux/slab.h>
25#include <linux/ucs2_string.h>
26#include <asm/setup.h>
27
28static bool dump_properties __initdata;
29
30static int __init dump_properties_enable(char *arg)
31{
32 dump_properties = true;
33 return 0;
34}
35
36__setup("dump_apple_properties", dump_properties_enable);
37
38struct dev_header {
39 u32 len;
40 u32 prop_count;
41 struct efi_dev_path path[0];
42
43
44
45
46};
47
48struct properties_header {
49 u32 len;
50 u32 version;
51 u32 dev_count;
52 struct dev_header dev_header[0];
53};
54
55static u8 one __initdata = 1;
56
57static void __init unmarshal_key_value_pairs(struct dev_header *dev_header,
58 struct device *dev, void *ptr,
59 struct property_entry entry[])
60{
61 int i;
62
63 for (i = 0; i < dev_header->prop_count; i++) {
64 int remaining = dev_header->len - (ptr - (void *)dev_header);
65 u32 key_len, val_len;
66 char *key;
67
68 if (sizeof(key_len) > remaining)
69 break;
70
71 key_len = *(typeof(key_len) *)ptr;
72 if (key_len + sizeof(val_len) > remaining ||
73 key_len < sizeof(key_len) + sizeof(efi_char16_t) ||
74 *(efi_char16_t *)(ptr + sizeof(key_len)) == 0) {
75 dev_err(dev, "invalid property name len at %#zx\n",
76 ptr - (void *)dev_header);
77 break;
78 }
79
80 val_len = *(typeof(val_len) *)(ptr + key_len);
81 if (key_len + val_len > remaining ||
82 val_len < sizeof(val_len)) {
83 dev_err(dev, "invalid property val len at %#zx\n",
84 ptr - (void *)dev_header + key_len);
85 break;
86 }
87
88
89 key = kzalloc((key_len - sizeof(key_len)) * 4 + 1, GFP_KERNEL);
90 if (!key) {
91 dev_err(dev, "cannot allocate property name\n");
92 break;
93 }
94 ucs2_as_utf8(key, ptr + sizeof(key_len),
95 key_len - sizeof(key_len));
96
97 entry[i].name = key;
98 entry[i].is_array = true;
99 entry[i].length = val_len - sizeof(val_len);
100 entry[i].pointer.raw_data = ptr + key_len + sizeof(val_len);
101 if (!entry[i].length) {
102
103 entry[i].length = 1;
104 entry[i].pointer.raw_data = &one;
105 }
106
107 if (dump_properties) {
108 dev_info(dev, "property: %s\n", entry[i].name);
109 print_hex_dump(KERN_INFO, pr_fmt(), DUMP_PREFIX_OFFSET,
110 16, 1, entry[i].pointer.raw_data,
111 entry[i].length, true);
112 }
113
114 ptr += key_len + val_len;
115 }
116
117 if (i != dev_header->prop_count) {
118 dev_err(dev, "got %d device properties, expected %u\n", i,
119 dev_header->prop_count);
120 print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
121 16, 1, dev_header, dev_header->len, true);
122 return;
123 }
124
125 dev_info(dev, "assigning %d device properties\n", i);
126}
127
128static int __init unmarshal_devices(struct properties_header *properties)
129{
130 size_t offset = offsetof(struct properties_header, dev_header[0]);
131
132 while (offset + sizeof(struct dev_header) < properties->len) {
133 struct dev_header *dev_header = (void *)properties + offset;
134 struct property_entry *entry = NULL;
135 struct device *dev;
136 size_t len;
137 int ret, i;
138 void *ptr;
139
140 if (offset + dev_header->len > properties->len ||
141 dev_header->len <= sizeof(*dev_header)) {
142 pr_err("invalid len in dev_header at %#zx\n", offset);
143 return -EINVAL;
144 }
145
146 ptr = dev_header->path;
147 len = dev_header->len - sizeof(*dev_header);
148
149 dev = efi_get_device_by_path((struct efi_dev_path **)&ptr, &len);
150 if (IS_ERR(dev)) {
151 pr_err("device path parse error %ld at %#zx:\n",
152 PTR_ERR(dev), ptr - (void *)dev_header);
153 print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
154 16, 1, dev_header, dev_header->len, true);
155 dev = NULL;
156 goto skip_device;
157 }
158
159 entry = kcalloc(dev_header->prop_count + 1, sizeof(*entry),
160 GFP_KERNEL);
161 if (!entry) {
162 dev_err(dev, "cannot allocate properties\n");
163 goto skip_device;
164 }
165
166 unmarshal_key_value_pairs(dev_header, dev, ptr, entry);
167 if (!entry[0].name)
168 goto skip_device;
169
170 ret = device_add_properties(dev, entry);
171 if (ret)
172 dev_err(dev, "error %d assigning properties\n", ret);
173
174 for (i = 0; entry[i].name; i++)
175 kfree(entry[i].name);
176
177skip_device:
178 kfree(entry);
179 put_device(dev);
180 offset += dev_header->len;
181 }
182
183 return 0;
184}
185
186static int __init map_properties(void)
187{
188 struct properties_header *properties;
189 struct setup_data *data;
190 u32 data_len;
191 u64 pa_data;
192 int ret;
193
194 if (!dmi_match(DMI_SYS_VENDOR, "Apple Inc.") &&
195 !dmi_match(DMI_SYS_VENDOR, "Apple Computer, Inc."))
196 return 0;
197
198 pa_data = boot_params.hdr.setup_data;
199 while (pa_data) {
200 data = ioremap(pa_data, sizeof(*data));
201 if (!data) {
202 pr_err("cannot map setup_data header\n");
203 return -ENOMEM;
204 }
205
206 if (data->type != SETUP_APPLE_PROPERTIES) {
207 pa_data = data->next;
208 iounmap(data);
209 continue;
210 }
211
212 data_len = data->len;
213 iounmap(data);
214
215 data = ioremap(pa_data, sizeof(*data) + data_len);
216 if (!data) {
217 pr_err("cannot map setup_data payload\n");
218 return -ENOMEM;
219 }
220
221 properties = (struct properties_header *)data->data;
222 if (properties->version != 1) {
223 pr_err("unsupported version:\n");
224 print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
225 16, 1, properties, data_len, true);
226 ret = -ENOTSUPP;
227 } else if (properties->len != data_len) {
228 pr_err("length mismatch, expected %u\n", data_len);
229 print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET,
230 16, 1, properties, data_len, true);
231 ret = -EINVAL;
232 } else
233 ret = unmarshal_devices(properties);
234
235
236
237
238
239 data->len = 0;
240 iounmap(data);
241 free_bootmem_late(pa_data + sizeof(*data), data_len);
242
243 return ret;
244 }
245 return 0;
246}
247
248fs_initcall(map_properties);
249
