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lightnvm: update bad block table format

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The specification was changed to reflect a multi-value bad block table.
Instead of bit-based bad block table, the bad block table now allows
eight bad block categories. Currently four are defined:

 * Factory bad blocks
 * Grown bad blocks
 * Device-side reserved blocks
 * Host-side reserved blocks

The factory and grown bad blocks are the regular bad blocks. The
reserved blocks are either for internal use or external use. In
particular, the device-side reserved blocks allows the host to
bootstrap from a limited number of flash blocks. Reducing the flash
blocks to scan upon super block initialization.

Support for both get bad block table and set bad block table is added.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Matias Bjørling
2015-11-16 15:34:37 +01:00
committed by Jens Axboe
parent aedf17f451
commit 1145046983
4 changed files with 117 additions and 36 deletions
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32
drivers/lightnvm/gennvm.c
View File

@@ -64,19 +64,22 @@ static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn)
return 0;
}
static int gennvm_block_bb(u32 lun_id, void *bb_bitmap, unsigned int nr_blocks,
static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks,
void *private)
{
struct gen_nvm *gn = private;
struct gen_lun *lun = &gn->luns[lun_id];
struct nvm_dev *dev = gn->dev;
struct gen_lun *lun;
struct nvm_block *blk;
int i;
if (unlikely(bitmap_empty(bb_bitmap, nr_blocks)))
return 0;
ppa = addr_to_generic_mode(gn->dev, ppa);
lun = &gn->luns[(dev->nr_luns * ppa.g.ch) + ppa.g.lun];
for (i = 0; i < nr_blocks; i++) {
if (blks[i] == 0)
continue;
i = -1;
while ((i = find_next_bit(bb_bitmap, nr_blocks, i + 1)) < nr_blocks) {
blk = &lun->vlun.blocks[i];
if (!blk) {
pr_err("gennvm: BB data is out of bounds.\n");
@@ -171,8 +174,16 @@ static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
}
if (dev->ops->get_bb_tbl) {
ret = dev->ops->get_bb_tbl(dev->q, lun->vlun.id,
dev->blks_per_lun, gennvm_block_bb, gn);
struct ppa_addr ppa;
ppa.ppa = 0;
ppa.g.ch = lun->vlun.chnl_id;
ppa.g.lun = lun->vlun.id;
ppa = generic_to_addr_mode(dev, ppa);
ret = dev->ops->get_bb_tbl(dev->q, ppa,
dev->blks_per_lun,
gennvm_block_bb, gn);
if (ret)
pr_err("gennvm: could not read BB table\n");
}
@@ -199,6 +210,7 @@ static int gennvm_register(struct nvm_dev *dev)
if (!gn)
return -ENOMEM;
gn->dev = dev;
gn->nr_luns = dev->nr_luns;
dev->mp = gn;
@@ -354,10 +366,10 @@ static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
{
int i;
if (!dev->ops->set_bb)
if (!dev->ops->set_bb_tbl)
return;
if (dev->ops->set_bb(dev->q, rqd, 1))
if (dev->ops->set_bb_tbl(dev->q, rqd, 1))
return;
gennvm_addr_to_generic_mode(dev, rqd);