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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>
This commit is contained in:
Aaron Durbin 2016-08-05 15:41:37 -05:00 committed by Martin Roth
parent 4884c5d52d
commit 367f2b9568
1 changed files with 21 additions and 19 deletions
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40
src/drivers/elog/elog.c
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@ -622,7 +622,7 @@ int elog_clear(void)
return elog_prepare_empty();
}
static void elog_find_flash(void)
static int elog_find_flash(void)
{
struct region r;
size_t reserved_space = ELOG_MIN_AVAILABLE_ENTRIES * MAX_EVENT_SIZE;
@ -632,16 +632,28 @@ static void elog_find_flash(void)
/* Find the ELOG base and size in FMAP */
if (fmap_locate_area("RW_ELOG", &r) < 0) {
printk(BIOS_WARNING, "ELOG: Unable to find RW_ELOG in FMAP\n");
flash_base = total_size = 0;
} else {
flash_base = region_offset(&r);
/* Keep 4KiB max size until large malloc()s have been fixed. */
total_size = MIN(4*KiB, region_sz(&r));
return -1;
}
if (region_sz(&r) < 4*KiB) {
printk(BIOS_WARNING, "ELOG: Needs a minium size of 4KiB: %zu\n",
region_sz(&r));
return -1;
}
flash_base = region_offset(&r);
/* Keep 4KiB max size until large malloc()s have been fixed. */
total_size = MIN(4*KiB, region_sz(&r));
full_threshold = total_size - reserved_space;
shrink_size = MIN(total_size * ELOG_SHRINK_PERCENTAGE / 100,
full_threshold);
shrink_size = total_size * ELOG_SHRINK_PERCENTAGE / 100;
if (reserved_space > shrink_size) {
printk(BIOS_ERR, "ELOG: SHRINK_PERCENTAGE too small\n");
return -1;
}
return 0;
}
static int elog_sync_to_nv(void)
@ -711,18 +723,8 @@ int elog_init(void)
}
/* Set up the backing store */
elog_find_flash();
if (flash_base == 0) {
printk(BIOS_ERR, "ELOG: Invalid flash base\n");
if (elog_find_flash() < 0)
return -1;
} else if (total_size < sizeof(struct elog_header) + MAX_EVENT_SIZE) {
printk(BIOS_ERR, "ELOG: Region too small to hold any events\n");
return -1;
} else if (total_size - shrink_size >= full_threshold) {
printk(BIOS_ERR,
"ELOG: SHRINK_PERCENTAGE set too small for MIN_AVAILABLE_ENTRIES\n");
return -1;
}
mirror_buffer = malloc(total_size);
if (!mirror_buffer) {