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kernel: mtk_bmt: extend debug interface

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Add support for showing remapped blocks and garbage collecting old
remapped blocks triggered by using the mark_good/mark_bad files

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2022-01-09 17:27:29 +01:00
parent fde2421597
commit 31b6cfb288
1 changed files with 96 additions and 0 deletions
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96
target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c
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@ -672,8 +672,103 @@ static int mtk_bmt_debug_mark_bad(void *data, u64 val)
return 0;
}
static unsigned long *
mtk_bmt_get_mapping_mask(void)
{
struct bbmt *bbmt = bmt_tbl(bmtd.bbt);
int main_blocks = bmtd.mtd->size >> bmtd.blk_shift;
unsigned long *used;
int i, k;
used = kcalloc(sizeof(unsigned long), BIT_WORD(bmtd.bmt_blk_idx) + 1, GFP_KERNEL);
if (!used)
return NULL;
for (i = 1; i < main_blocks; i++) {
if (bmtd.bbt->bb_tbl[i] == i)
continue;
for (k = 0; k < bmtd.bmt_blk_idx; k++) {
if (bmtd.bbt->bb_tbl[i] != bbmt[k].block)
continue;
set_bit(k, used);
break;
}
}
return used;
}
static int mtk_bmt_debug(void *data, u64 val)
{
struct bbmt *bbmt = bmt_tbl(bmtd.bbt);
struct mtd_info *mtd = bmtd.mtd;
unsigned long *used;
int main_blocks = mtd->size >> bmtd.blk_shift;
int n_remap = 0;
int i;
used = mtk_bmt_get_mapping_mask();
if (!used)
return -ENOMEM;
switch (val) {
case 0:
for (i = 1; i < main_blocks; i++) {
if (bmtd.bbt->bb_tbl[i] == i)
continue;
printk("remap [%x->%x]\n", i, bmtd.bbt->bb_tbl[i]);
n_remap++;
}
for (i = 0; i <= bmtd.bmt_blk_idx; i++) {
char c;
switch (bbmt[i].mapped) {
case NO_MAPPED:
continue;
case NORMAL_MAPPED:
c = 'm';
if (test_bit(i, used))
c = 'M';
break;
case BMT_MAPPED:
c = 'B';
break;
default:
c = 'X';
break;
}
printk("[%x:%c] = 0x%x\n", i, c, bbmt[i].block);
}
break;
case 100:
for (i = 0; i <= bmtd.bmt_blk_idx; i++) {
if (bbmt[i].mapped != NORMAL_MAPPED)
continue;
if (test_bit(i, used))
continue;
n_remap++;
bbmt[i].mapped = NO_MAPPED;
printk("free block [%d:%x]\n", i, bbmt[i].block);
}
if (n_remap)
bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx);
break;
}
kfree(used);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(fops_mark_good, NULL, mtk_bmt_debug_mark_good, "%llu\n");
DEFINE_DEBUGFS_ATTRIBUTE(fops_mark_bad, NULL, mtk_bmt_debug_mark_bad, "%llu\n");
DEFINE_DEBUGFS_ATTRIBUTE(fops_debug, NULL, mtk_bmt_debug, "%llu\n");
static void
mtk_bmt_add_debugfs(void)
@ -686,6 +781,7 @@ mtk_bmt_add_debugfs(void)
debugfs_create_file_unsafe("mark_good", S_IWUSR, dir, NULL, &fops_mark_good);
debugfs_create_file_unsafe("mark_bad", S_IWUSR, dir, NULL, &fops_mark_bad);
debugfs_create_file_unsafe("debug", S_IWUSR, dir, NULL, &fops_debug);
}
void mtk_bmt_detach(struct mtd_info *mtd)