2 * Copyright (c) 2011, Google Inc. All rights reserved.
4 * SPDX-License-Identifier: GPL-2.0+
9 * This module records the progress of boot and arbitrary commands, and
10 * permits accurate timestamping of each.
12 * TBD: Pass timings to kernel in the FDT
18 #include <linux/compiler.h>
20 DECLARE_GLOBAL_DATA_PTR;
22 struct bootstage_record {
26 int flags; /* see enum bootstage_flags */
30 static struct bootstage_record record[BOOTSTAGE_ID_COUNT] = { {1} };
31 static int next_id = BOOTSTAGE_ID_USER;
34 BOOTSTAGE_VERSION = 0,
35 BOOTSTAGE_MAGIC = 0xb00757a3,
39 struct bootstage_hdr {
40 uint32_t version; /* BOOTSTAGE_VERSION */
41 uint32_t count; /* Number of records */
42 uint32_t size; /* Total data size (non-zero if valid) */
43 uint32_t magic; /* Unused */
46 int bootstage_relocate(void)
51 * Duplicate all strings. They may point to an old location in the
52 * program .text section that can eventually get trashed.
54 for (i = 0; i < BOOTSTAGE_ID_COUNT; i++)
56 record[i].name = strdup(record[i].name);
61 ulong bootstage_add_record(enum bootstage_id id, const char *name,
62 int flags, ulong mark)
64 struct bootstage_record *rec;
66 if (flags & BOOTSTAGEF_ALLOC)
69 if (id < BOOTSTAGE_ID_COUNT) {
72 /* Only record the first event for each */
81 /* Tell the board about this progress */
82 show_boot_progress(flags & BOOTSTAGEF_ERROR ? -id : id);
87 ulong bootstage_mark(enum bootstage_id id)
89 return bootstage_add_record(id, NULL, 0, timer_get_boot_us());
92 ulong bootstage_error(enum bootstage_id id)
94 return bootstage_add_record(id, NULL, BOOTSTAGEF_ERROR,
98 ulong bootstage_mark_name(enum bootstage_id id, const char *name)
102 if (id == BOOTSTAGE_ID_ALLOC)
103 flags = BOOTSTAGEF_ALLOC;
104 return bootstage_add_record(id, name, flags, timer_get_boot_us());
107 ulong bootstage_mark_code(const char *file, const char *func, int linenum)
110 __maybe_unused char *end;
113 /* First work out the length we need to allocate */
121 str = malloc(len + 1);
125 p += snprintf(p, end - p, "%s,", file);
127 p += snprintf(p, end - p, "%d", linenum);
129 p += snprintf(p, end - p, ": %s", func);
131 return bootstage_mark_name(BOOTSTAGE_ID_ALLOC, str);
134 uint32_t bootstage_start(enum bootstage_id id, const char *name)
136 struct bootstage_record *rec = &record[id];
138 rec->start_us = timer_get_boot_us();
140 return rec->start_us;
143 uint32_t bootstage_accum(enum bootstage_id id)
145 struct bootstage_record *rec = &record[id];
148 duration = (uint32_t)timer_get_boot_us() - rec->start_us;
149 rec->time_us += duration;
154 * Get a record name as a printable string
156 * @param buf Buffer to put name if needed
157 * @param len Length of buffer
158 * @param rec Boot stage record to get the name from
159 * @return pointer to name, either from the record or pointing to buf.
161 static const char *get_record_name(char *buf, int len,
162 struct bootstage_record *rec)
166 else if (rec->id >= BOOTSTAGE_ID_USER)
167 snprintf(buf, len, "user_%d", rec->id - BOOTSTAGE_ID_USER);
169 snprintf(buf, len, "id=%d", rec->id);
174 static uint32_t print_time_record(enum bootstage_id id,
175 struct bootstage_record *rec, uint32_t prev)
181 print_grouped_ull(rec->time_us, BOOTSTAGE_DIGITS);
183 print_grouped_ull(rec->time_us, BOOTSTAGE_DIGITS);
184 print_grouped_ull(rec->time_us - prev, BOOTSTAGE_DIGITS);
186 printf(" %s\n", get_record_name(buf, sizeof(buf), rec));
191 static int h_compare_record(const void *r1, const void *r2)
193 const struct bootstage_record *rec1 = r1, *rec2 = r2;
195 return rec1->time_us > rec2->time_us ? 1 : -1;
198 #ifdef CONFIG_OF_LIBFDT
200 * Add all bootstage timings to a device tree.
202 * @param blob Device tree blob
203 * @return 0 on success, != 0 on failure.
205 static int add_bootstages_devicetree(struct fdt_header *blob)
216 * Create the node for bootstage.
217 * The address of flat device tree is set up by the command bootm.
219 bootstage = fdt_add_subnode(blob, 0, "bootstage");
224 * Insert the timings to the device tree in the reverse order so
225 * that they can be printed in the Linux kernel in the right order.
227 for (id = BOOTSTAGE_ID_COUNT - 1, i = 0; id >= 0; id--, i++) {
228 struct bootstage_record *rec = &record[id];
231 if (id != BOOTSTAGE_ID_AWAKE && rec->time_us == 0)
234 node = fdt_add_subnode(blob, bootstage, simple_itoa(i));
238 /* add properties to the node. */
239 if (fdt_setprop_string(blob, node, "name",
240 get_record_name(buf, sizeof(buf), rec)))
243 /* Check if this is a 'mark' or 'accum' record */
244 if (fdt_setprop_cell(blob, node,
245 rec->start_us ? "accum" : "mark",
253 int bootstage_fdt_add_report(void)
255 if (add_bootstages_devicetree(working_fdt))
256 puts("bootstage: Failed to add to device tree\n");
262 void bootstage_report(void)
264 struct bootstage_record *rec = record;
268 puts("Timer summary in microseconds:\n");
269 printf("%11s%11s %s\n", "Mark", "Elapsed", "Stage");
271 /* Fake the first record - we could get it from early boot */
274 prev = print_time_record(BOOTSTAGE_ID_AWAKE, rec, 0);
276 /* Sort records by increasing time */
277 qsort(record, ARRAY_SIZE(record), sizeof(*rec), h_compare_record);
279 for (id = 0; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
280 if (rec->time_us != 0 && !rec->start_us)
281 prev = print_time_record(rec->id, rec, prev);
283 if (next_id > BOOTSTAGE_ID_COUNT)
284 printf("(Overflowed internal boot id table by %d entries\n"
285 "- please increase CONFIG_BOOTSTAGE_USER_COUNT\n",
286 next_id - BOOTSTAGE_ID_COUNT);
288 puts("\nAccumulated time:\n");
289 for (id = 0, rec = record; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
291 prev = print_time_record(id, rec, -1);
295 ulong __timer_get_boot_us(void)
297 static ulong base_time;
300 * We can't implement this properly. Return 0 on the first call and
301 * larger values after that.
304 return get_timer(base_time) * 1000;
305 base_time = get_timer(0);
309 ulong timer_get_boot_us(void)
310 __attribute__((weak, alias("__timer_get_boot_us")));
313 * Append data to a memory buffer
315 * Write data to the buffer if there is space. Whether there is space or not,
316 * the buffer pointer is incremented.
318 * @param ptrp Pointer to buffer, updated by this function
319 * @param end Pointer to end of buffer
320 * @param data Data to write to buffer
321 * @param size Size of data
323 static void append_data(char **ptrp, char *end, const void *data, int size)
331 memcpy(ptr, data, size);
334 int bootstage_stash(void *base, int size)
336 struct bootstage_hdr *hdr = (struct bootstage_hdr *)base;
337 struct bootstage_record *rec;
339 char *ptr = base, *end = ptr + size;
343 if (hdr + 1 > (struct bootstage_hdr *)end) {
344 debug("%s: Not enough space for bootstage hdr\n", __func__);
348 /* Write an arbitrary version number */
349 hdr->version = BOOTSTAGE_VERSION;
351 /* Count the number of records, and write that value first */
352 for (rec = record, id = count = 0; id < BOOTSTAGE_ID_COUNT;
354 if (rec->time_us != 0)
359 hdr->magic = BOOTSTAGE_MAGIC;
362 /* Write the records, silently stopping when we run out of space */
363 for (rec = record, id = 0; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
364 if (rec->time_us != 0)
365 append_data(&ptr, end, rec, sizeof(*rec));
368 /* Write the name strings */
369 for (rec = record, id = 0; id < BOOTSTAGE_ID_COUNT; id++, rec++) {
370 if (rec->time_us != 0) {
373 name = get_record_name(buf, sizeof(buf), rec);
374 append_data(&ptr, end, name, strlen(name) + 1);
378 /* Check for buffer overflow */
380 debug("%s: Not enough space for bootstage stash\n", __func__);
384 /* Update total data size */
385 hdr->size = ptr - (char *)base;
386 printf("Stashed %d records\n", hdr->count);
391 int bootstage_unstash(void *base, int size)
393 struct bootstage_hdr *hdr = (struct bootstage_hdr *)base;
394 struct bootstage_record *rec;
395 char *ptr = base, *end = ptr + size;
400 end = (char *)(~(uintptr_t)0);
402 if (hdr + 1 > (struct bootstage_hdr *)end) {
403 debug("%s: Not enough space for bootstage hdr\n", __func__);
407 if (hdr->magic != BOOTSTAGE_MAGIC) {
408 debug("%s: Invalid bootstage magic\n", __func__);
412 if (ptr + hdr->size > end) {
413 debug("%s: Bootstage data runs past buffer end\n", __func__);
417 if (hdr->count * sizeof(*rec) > hdr->size) {
418 debug("%s: Bootstage has %d records needing %lu bytes, but "
419 "only %d bytes is available\n", __func__, hdr->count,
420 (ulong)hdr->count * sizeof(*rec), hdr->size);
424 if (hdr->version != BOOTSTAGE_VERSION) {
425 debug("%s: Bootstage data version %#0x unrecognised\n",
426 __func__, hdr->version);
430 if (next_id + hdr->count > BOOTSTAGE_ID_COUNT) {
431 debug("%s: Bootstage has %d records, we have space for %d\n"
432 "- please increase CONFIG_BOOTSTAGE_USER_COUNT\n",
433 __func__, hdr->count, BOOTSTAGE_ID_COUNT - next_id);
439 /* Read the records */
440 rec_size = hdr->count * sizeof(*record);
441 memcpy(record + next_id, ptr, rec_size);
443 /* Read the name strings */
445 for (rec = record + next_id, id = 0; id < hdr->count; id++, rec++) {
448 /* Assume no data corruption here */
449 ptr += strlen(ptr) + 1;
452 /* Mark the records as read */
453 next_id += hdr->count;
454 printf("Unstashed %d records\n", hdr->count);