drivers/elog: consolidate checks in elog_find_flash()
There were checks against global variables trying to determine failing cases of elog_find_flash(). Instead move the checks into elog_find_flash() and return value indicating failure. A minimum 4KiB check was added to ensure the eventlog is at least that size which makes the heuristic checks cleaner. BUG=chrome-os-partner:55932 Change-Id: I4d9d13148555e05d4f217a10f995831a0e437fc3 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/16101 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
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@ -622,7 +622,7 @@ int elog_clear(void)
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return elog_prepare_empty();
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}
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static void elog_find_flash(void)
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static int elog_find_flash(void)
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{
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struct region r;
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size_t reserved_space = ELOG_MIN_AVAILABLE_ENTRIES * MAX_EVENT_SIZE;
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@ -632,16 +632,28 @@ static void elog_find_flash(void)
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/* Find the ELOG base and size in FMAP */
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if (fmap_locate_area("RW_ELOG", &r) < 0) {
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printk(BIOS_WARNING, "ELOG: Unable to find RW_ELOG in FMAP\n");
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flash_base = total_size = 0;
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} else {
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flash_base = region_offset(&r);
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/* Keep 4KiB max size until large malloc()s have been fixed. */
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total_size = MIN(4*KiB, region_sz(&r));
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return -1;
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}
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if (region_sz(&r) < 4*KiB) {
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printk(BIOS_WARNING, "ELOG: Needs a minium size of 4KiB: %zu\n",
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region_sz(&r));
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return -1;
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}
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flash_base = region_offset(&r);
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/* Keep 4KiB max size until large malloc()s have been fixed. */
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total_size = MIN(4*KiB, region_sz(&r));
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full_threshold = total_size - reserved_space;
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shrink_size = MIN(total_size * ELOG_SHRINK_PERCENTAGE / 100,
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full_threshold);
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shrink_size = total_size * ELOG_SHRINK_PERCENTAGE / 100;
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if (reserved_space > shrink_size) {
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printk(BIOS_ERR, "ELOG: SHRINK_PERCENTAGE too small\n");
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return -1;
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}
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return 0;
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}
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static int elog_sync_to_nv(void)
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@ -711,18 +723,8 @@ int elog_init(void)
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}
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/* Set up the backing store */
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elog_find_flash();
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if (flash_base == 0) {
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printk(BIOS_ERR, "ELOG: Invalid flash base\n");
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if (elog_find_flash() < 0)
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return -1;
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} else if (total_size < sizeof(struct elog_header) + MAX_EVENT_SIZE) {
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printk(BIOS_ERR, "ELOG: Region too small to hold any events\n");
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return -1;
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} else if (total_size - shrink_size >= full_threshold) {
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printk(BIOS_ERR,
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"ELOG: SHRINK_PERCENTAGE set too small for MIN_AVAILABLE_ENTRIES\n");
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return -1;
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}
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mirror_buffer = malloc(total_size);
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if (!mirror_buffer) {
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