quorum: Avoid bdrv_aio_writev() for rewrites
[qemu.git] / device_tree.c
1 /*
2 * Functions to help device tree manipulation using libfdt.
3 * It also provides functions to read entries from device tree proc
4 * interface.
5 *
6 * Copyright 2008 IBM Corporation.
7 * Authors: Jerone Young <jyoung5@us.ibm.com>
8 * Hollis Blanchard <hollisb@us.ibm.com>
9 *
10 * This work is licensed under the GNU GPL license version 2 or later.
11 *
12 */
13
14 #include "qemu/osdep.h"
15
16 #ifdef CONFIG_LINUX
17 #include <dirent.h>
18 #endif
19
20 #include "qapi/error.h"
21 #include "qemu-common.h"
22 #include "qemu/error-report.h"
23 #include "qemu/bswap.h"
24 #include "sysemu/device_tree.h"
25 #include "sysemu/sysemu.h"
26 #include "hw/loader.h"
27 #include "hw/boards.h"
28 #include "qemu/config-file.h"
29
30 #include <libfdt.h>
31
32 #define FDT_MAX_SIZE 0x10000
33
34 void *create_device_tree(int *sizep)
35 {
36 void *fdt;
37 int ret;
38
39 *sizep = FDT_MAX_SIZE;
40 fdt = g_malloc0(FDT_MAX_SIZE);
41 ret = fdt_create(fdt, FDT_MAX_SIZE);
42 if (ret < 0) {
43 goto fail;
44 }
45 ret = fdt_finish_reservemap(fdt);
46 if (ret < 0) {
47 goto fail;
48 }
49 ret = fdt_begin_node(fdt, "");
50 if (ret < 0) {
51 goto fail;
52 }
53 ret = fdt_end_node(fdt);
54 if (ret < 0) {
55 goto fail;
56 }
57 ret = fdt_finish(fdt);
58 if (ret < 0) {
59 goto fail;
60 }
61 ret = fdt_open_into(fdt, fdt, *sizep);
62 if (ret) {
63 error_report("Unable to copy device tree in memory");
64 exit(1);
65 }
66
67 return fdt;
68 fail:
69 error_report("%s Couldn't create dt: %s", __func__, fdt_strerror(ret));
70 exit(1);
71 }
72
73 void *load_device_tree(const char *filename_path, int *sizep)
74 {
75 int dt_size;
76 int dt_file_load_size;
77 int ret;
78 void *fdt = NULL;
79
80 *sizep = 0;
81 dt_size = get_image_size(filename_path);
82 if (dt_size < 0) {
83 error_report("Unable to get size of device tree file '%s'",
84 filename_path);
85 goto fail;
86 }
87
88 /* Expand to 2x size to give enough room for manipulation. */
89 dt_size += 10000;
90 dt_size *= 2;
91 /* First allocate space in qemu for device tree */
92 fdt = g_malloc0(dt_size);
93
94 dt_file_load_size = load_image(filename_path, fdt);
95 if (dt_file_load_size < 0) {
96 error_report("Unable to open device tree file '%s'",
97 filename_path);
98 goto fail;
99 }
100
101 ret = fdt_open_into(fdt, fdt, dt_size);
102 if (ret) {
103 error_report("Unable to copy device tree in memory");
104 goto fail;
105 }
106
107 /* Check sanity of device tree */
108 if (fdt_check_header(fdt)) {
109 error_report("Device tree file loaded into memory is invalid: %s",
110 filename_path);
111 goto fail;
112 }
113 *sizep = dt_size;
114 return fdt;
115
116 fail:
117 g_free(fdt);
118 return NULL;
119 }
120
121 #ifdef CONFIG_LINUX
122
123 #define SYSFS_DT_BASEDIR "/proc/device-tree"
124
125 /**
126 * read_fstree: this function is inspired from dtc read_fstree
127 * @fdt: preallocated fdt blob buffer, to be populated
128 * @dirname: directory to scan under SYSFS_DT_BASEDIR
129 * the search is recursive and the tree is searched down to the
130 * leaves (property files).
131 *
132 * the function asserts in case of error
133 */
134 static void read_fstree(void *fdt, const char *dirname)
135 {
136 DIR *d;
137 struct dirent *de;
138 struct stat st;
139 const char *root_dir = SYSFS_DT_BASEDIR;
140 const char *parent_node;
141
142 if (strstr(dirname, root_dir) != dirname) {
143 error_setg(&error_fatal, "%s: %s must be searched within %s",
144 __func__, dirname, root_dir);
145 }
146 parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];
147
148 d = opendir(dirname);
149 if (!d) {
150 error_setg(&error_fatal, "%s cannot open %s", __func__, dirname);
151 }
152
153 while ((de = readdir(d)) != NULL) {
154 char *tmpnam;
155
156 if (!g_strcmp0(de->d_name, ".")
157 || !g_strcmp0(de->d_name, "..")) {
158 continue;
159 }
160
161 tmpnam = g_strdup_printf("%s/%s", dirname, de->d_name);
162
163 if (lstat(tmpnam, &st) < 0) {
164 error_setg(&error_fatal, "%s cannot lstat %s", __func__, tmpnam);
165 }
166
167 if (S_ISREG(st.st_mode)) {
168 gchar *val;
169 gsize len;
170
171 if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
172 error_setg(&error_fatal, "%s not able to extract info from %s",
173 __func__, tmpnam);
174 }
175
176 if (strlen(parent_node) > 0) {
177 qemu_fdt_setprop(fdt, parent_node,
178 de->d_name, val, len);
179 } else {
180 qemu_fdt_setprop(fdt, "/", de->d_name, val, len);
181 }
182 g_free(val);
183 } else if (S_ISDIR(st.st_mode)) {
184 char *node_name;
185
186 node_name = g_strdup_printf("%s/%s",
187 parent_node, de->d_name);
188 qemu_fdt_add_subnode(fdt, node_name);
189 g_free(node_name);
190 read_fstree(fdt, tmpnam);
191 }
192
193 g_free(tmpnam);
194 }
195
196 closedir(d);
197 }
198
199 /* load_device_tree_from_sysfs: extract the dt blob from host sysfs */
200 void *load_device_tree_from_sysfs(void)
201 {
202 void *host_fdt;
203 int host_fdt_size;
204
205 host_fdt = create_device_tree(&host_fdt_size);
206 read_fstree(host_fdt, SYSFS_DT_BASEDIR);
207 if (fdt_check_header(host_fdt)) {
208 error_setg(&error_fatal,
209 "%s host device tree extracted into memory is invalid",
210 __func__);
211 }
212 return host_fdt;
213 }
214
215 #endif /* CONFIG_LINUX */
216
217 static int findnode_nofail(void *fdt, const char *node_path)
218 {
219 int offset;
220
221 offset = fdt_path_offset(fdt, node_path);
222 if (offset < 0) {
223 error_report("%s Couldn't find node %s: %s", __func__, node_path,
224 fdt_strerror(offset));
225 exit(1);
226 }
227
228 return offset;
229 }
230
231 char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
232 Error **errp)
233 {
234 int offset, len, ret;
235 const char *iter_name;
236 unsigned int path_len = 16, n = 0;
237 GSList *path_list = NULL, *iter;
238 char **path_array;
239
240 offset = fdt_node_offset_by_compatible(fdt, -1, compat);
241
242 while (offset >= 0) {
243 iter_name = fdt_get_name(fdt, offset, &len);
244 if (!iter_name) {
245 offset = len;
246 break;
247 }
248 if (!strcmp(iter_name, name)) {
249 char *path;
250
251 path = g_malloc(path_len);
252 while ((ret = fdt_get_path(fdt, offset, path, path_len))
253 == -FDT_ERR_NOSPACE) {
254 path_len += 16;
255 path = g_realloc(path, path_len);
256 }
257 path_list = g_slist_prepend(path_list, path);
258 n++;
259 }
260 offset = fdt_node_offset_by_compatible(fdt, offset, compat);
261 }
262
263 if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
264 error_setg(errp, "%s: abort parsing dt for %s/%s: %s",
265 __func__, name, compat, fdt_strerror(offset));
266 for (iter = path_list; iter; iter = iter->next) {
267 g_free(iter->data);
268 }
269 g_slist_free(path_list);
270 return NULL;
271 }
272
273 path_array = g_new(char *, n + 1);
274 path_array[n--] = NULL;
275
276 for (iter = path_list; iter; iter = iter->next) {
277 path_array[n--] = iter->data;
278 }
279
280 g_slist_free(path_list);
281
282 return path_array;
283 }
284
285 int qemu_fdt_setprop(void *fdt, const char *node_path,
286 const char *property, const void *val, int size)
287 {
288 int r;
289
290 r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val, size);
291 if (r < 0) {
292 error_report("%s: Couldn't set %s/%s: %s", __func__, node_path,
293 property, fdt_strerror(r));
294 exit(1);
295 }
296
297 return r;
298 }
299
300 int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
301 const char *property, uint32_t val)
302 {
303 int r;
304
305 r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
306 if (r < 0) {
307 error_report("%s: Couldn't set %s/%s = %#08x: %s", __func__,
308 node_path, property, val, fdt_strerror(r));
309 exit(1);
310 }
311
312 return r;
313 }
314
315 int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
316 const char *property, uint64_t val)
317 {
318 val = cpu_to_be64(val);
319 return qemu_fdt_setprop(fdt, node_path, property, &val, sizeof(val));
320 }
321
322 int qemu_fdt_setprop_string(void *fdt, const char *node_path,
323 const char *property, const char *string)
324 {
325 int r;
326
327 r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
328 if (r < 0) {
329 error_report("%s: Couldn't set %s/%s = %s: %s", __func__,
330 node_path, property, string, fdt_strerror(r));
331 exit(1);
332 }
333
334 return r;
335 }
336
337 const void *qemu_fdt_getprop(void *fdt, const char *node_path,
338 const char *property, int *lenp, Error **errp)
339 {
340 int len;
341 const void *r;
342
343 if (!lenp) {
344 lenp = &len;
345 }
346 r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
347 if (!r) {
348 error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__,
349 node_path, property, fdt_strerror(*lenp));
350 }
351 return r;
352 }
353
354 uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
355 const char *property, int *lenp, Error **errp)
356 {
357 int len;
358 const uint32_t *p;
359
360 if (!lenp) {
361 lenp = &len;
362 }
363 p = qemu_fdt_getprop(fdt, node_path, property, lenp, errp);
364 if (!p) {
365 return 0;
366 } else if (*lenp != 4) {
367 error_setg(errp, "%s: %s/%s not 4 bytes long (not a cell?)",
368 __func__, node_path, property);
369 *lenp = -EINVAL;
370 return 0;
371 }
372 return be32_to_cpu(*p);
373 }
374
375 uint32_t qemu_fdt_get_phandle(void *fdt, const char *path)
376 {
377 uint32_t r;
378
379 r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
380 if (r == 0) {
381 error_report("%s: Couldn't get phandle for %s: %s", __func__,
382 path, fdt_strerror(r));
383 exit(1);
384 }
385
386 return r;
387 }
388
389 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
390 const char *property,
391 const char *target_node_path)
392 {
393 uint32_t phandle = qemu_fdt_get_phandle(fdt, target_node_path);
394 return qemu_fdt_setprop_cell(fdt, node_path, property, phandle);
395 }
396
397 uint32_t qemu_fdt_alloc_phandle(void *fdt)
398 {
399 static int phandle = 0x0;
400
401 /*
402 * We need to find out if the user gave us special instruction at
403 * which phandle id to start allocating phandles.
404 */
405 if (!phandle) {
406 phandle = machine_phandle_start(current_machine);
407 }
408
409 if (!phandle) {
410 /*
411 * None or invalid phandle given on the command line, so fall back to
412 * default starting point.
413 */
414 phandle = 0x8000;
415 }
416
417 return phandle++;
418 }
419
420 int qemu_fdt_nop_node(void *fdt, const char *node_path)
421 {
422 int r;
423
424 r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
425 if (r < 0) {
426 error_report("%s: Couldn't nop node %s: %s", __func__, node_path,
427 fdt_strerror(r));
428 exit(1);
429 }
430
431 return r;
432 }
433
434 int qemu_fdt_add_subnode(void *fdt, const char *name)
435 {
436 char *dupname = g_strdup(name);
437 char *basename = strrchr(dupname, '/');
438 int retval;
439 int parent = 0;
440
441 if (!basename) {
442 g_free(dupname);
443 return -1;
444 }
445
446 basename[0] = '\0';
447 basename++;
448
449 if (dupname[0]) {
450 parent = findnode_nofail(fdt, dupname);
451 }
452
453 retval = fdt_add_subnode(fdt, parent, basename);
454 if (retval < 0) {
455 error_report("FDT: Failed to create subnode %s: %s", name,
456 fdt_strerror(retval));
457 exit(1);
458 }
459
460 g_free(dupname);
461 return retval;
462 }
463
464 void qemu_fdt_dumpdtb(void *fdt, int size)
465 {
466 const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "dumpdtb");
467
468 if (dumpdtb) {
469 /* Dump the dtb to a file and quit */
470 exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
471 }
472 }
473
474 int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
475 const char *node_path,
476 const char *property,
477 int numvalues,
478 uint64_t *values)
479 {
480 uint32_t *propcells;
481 uint64_t value;
482 int cellnum, vnum, ncells;
483 uint32_t hival;
484 int ret;
485
486 propcells = g_new0(uint32_t, numvalues * 2);
487
488 cellnum = 0;
489 for (vnum = 0; vnum < numvalues; vnum++) {
490 ncells = values[vnum * 2];
491 if (ncells != 1 && ncells != 2) {
492 ret = -1;
493 goto out;
494 }
495 value = values[vnum * 2 + 1];
496 hival = cpu_to_be32(value >> 32);
497 if (ncells > 1) {
498 propcells[cellnum++] = hival;
499 } else if (hival != 0) {
500 ret = -1;
501 goto out;
502 }
503 propcells[cellnum++] = cpu_to_be32(value);
504 }
505
506 ret = qemu_fdt_setprop(fdt, node_path, property, propcells,
507 cellnum * sizeof(uint32_t));
508 out:
509 g_free(propcells);
510 return ret;
511 }