2 * Copyright (C) 2015 Matias Bjorling <m@bjorling.me>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License version
6 * 2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; see the file COPYING. If not, write to
15 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
18 * Implementation of a generic nvm manager for Open-Channel SSDs.
23 static void gennvm_blocks_free(struct nvm_dev *dev)
25 struct gen_nvm *gn = dev->mp;
29 gennvm_for_each_lun(gn, lun, i) {
30 if (!lun->vlun.blocks)
32 vfree(lun->vlun.blocks);
36 static void gennvm_luns_free(struct nvm_dev *dev)
38 struct gen_nvm *gn = dev->mp;
43 static int gennvm_luns_init(struct nvm_dev *dev, struct gen_nvm *gn)
48 gn->luns = kcalloc(dev->nr_luns, sizeof(struct gen_lun), GFP_KERNEL);
52 gennvm_for_each_lun(gn, lun, i) {
53 spin_lock_init(&lun->vlun.lock);
54 INIT_LIST_HEAD(&lun->free_list);
55 INIT_LIST_HEAD(&lun->used_list);
56 INIT_LIST_HEAD(&lun->bb_list);
58 lun->reserved_blocks = 2; /* for GC only */
60 lun->vlun.lun_id = i % dev->luns_per_chnl;
61 lun->vlun.chnl_id = i / dev->luns_per_chnl;
62 lun->vlun.nr_free_blocks = dev->blks_per_lun;
63 lun->vlun.nr_inuse_blocks = 0;
64 lun->vlun.nr_bad_blocks = 0;
69 static int gennvm_block_bb(struct ppa_addr ppa, int nr_blocks, u8 *blks,
72 struct gen_nvm *gn = private;
73 struct nvm_dev *dev = gn->dev;
75 struct nvm_block *blk;
78 lun = &gn->luns[(dev->nr_luns * ppa.g.ch) + ppa.g.lun];
80 for (i = 0; i < nr_blocks; i++) {
84 blk = &lun->vlun.blocks[i];
86 pr_err("gennvm: BB data is out of bounds.\n");
90 list_move_tail(&blk->list, &lun->bb_list);
91 lun->vlun.nr_bad_blocks++;
97 static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
99 struct nvm_dev *dev = private;
100 struct gen_nvm *gn = dev->mp;
101 sector_t max_pages = dev->total_pages * (dev->sec_size >> 9);
102 u64 elba = slba + nlb;
104 struct nvm_block *blk;
108 if (unlikely(elba > dev->total_pages)) {
109 pr_err("gennvm: L2P data from device is out of bounds!\n");
113 for (i = 0; i < nlb; i++) {
114 u64 pba = le64_to_cpu(entries[i]);
116 if (unlikely(pba >= max_pages && pba != U64_MAX)) {
117 pr_err("gennvm: L2P data entry is out of bounds!\n");
121 /* Address zero is a special one. The first page on a disk is
122 * protected. It often holds internal device boot
128 /* resolve block from physical address */
129 lun_id = div_u64(pba, dev->sec_per_lun);
130 lun = &gn->luns[lun_id];
132 /* Calculate block offset into lun */
133 pba = pba - (dev->sec_per_lun * lun_id);
134 blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];
137 /* at this point, we don't know anything about the
138 * block. It's up to the FTL on top to re-etablish the
141 list_move_tail(&blk->list, &lun->used_list);
143 lun->vlun.nr_free_blocks--;
144 lun->vlun.nr_inuse_blocks++;
151 static int gennvm_blocks_init(struct nvm_dev *dev, struct gen_nvm *gn)
154 struct nvm_block *block;
155 sector_t lun_iter, blk_iter, cur_block_id = 0;
158 gennvm_for_each_lun(gn, lun, lun_iter) {
159 lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) *
161 if (!lun->vlun.blocks)
164 for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) {
165 block = &lun->vlun.blocks[blk_iter];
167 INIT_LIST_HEAD(&block->list);
169 block->lun = &lun->vlun;
170 block->id = cur_block_id++;
172 /* First block is reserved for device */
173 if (unlikely(lun_iter == 0 && blk_iter == 0)) {
174 lun->vlun.nr_free_blocks--;
178 list_add_tail(&block->list, &lun->free_list);
181 if (dev->ops->get_bb_tbl) {
185 ppa.g.ch = lun->vlun.chnl_id;
186 ppa.g.lun = lun->vlun.id;
187 ppa = generic_to_dev_addr(dev, ppa);
189 ret = dev->ops->get_bb_tbl(dev, ppa,
191 gennvm_block_bb, gn);
193 pr_err("gennvm: could not read BB table\n");
197 if (dev->ops->get_l2p_tbl) {
198 ret = dev->ops->get_l2p_tbl(dev->q, 0, dev->total_pages,
199 gennvm_block_map, dev);
201 pr_err("gennvm: could not read L2P table.\n");
202 pr_warn("gennvm: default block initialization");
209 static void gennvm_free(struct nvm_dev *dev)
211 gennvm_blocks_free(dev);
212 gennvm_luns_free(dev);
217 static int gennvm_register(struct nvm_dev *dev)
222 gn = kzalloc(sizeof(struct gen_nvm), GFP_KERNEL);
227 gn->nr_luns = dev->nr_luns;
230 ret = gennvm_luns_init(dev, gn);
232 pr_err("gennvm: could not initialize luns\n");
236 ret = gennvm_blocks_init(dev, gn);
238 pr_err("gennvm: could not initialize blocks\n");
248 static void gennvm_unregister(struct nvm_dev *dev)
253 static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
254 struct nvm_lun *vlun, unsigned long flags)
256 struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
257 struct nvm_block *blk = NULL;
258 int is_gc = flags & NVM_IOTYPE_GC;
260 spin_lock(&vlun->lock);
262 if (list_empty(&lun->free_list)) {
263 pr_err_ratelimited("gennvm: lun %u have no free pages available",
265 spin_unlock(&vlun->lock);
269 while (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks) {
270 spin_unlock(&vlun->lock);
274 blk = list_first_entry(&lun->free_list, struct nvm_block, list);
275 list_move_tail(&blk->list, &lun->used_list);
278 lun->vlun.nr_free_blocks--;
279 lun->vlun.nr_inuse_blocks++;
281 spin_unlock(&vlun->lock);
286 static void gennvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
288 struct nvm_lun *vlun = blk->lun;
289 struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);
291 spin_lock(&vlun->lock);
295 list_move_tail(&blk->list, &lun->free_list);
296 lun->vlun.nr_free_blocks++;
297 lun->vlun.nr_inuse_blocks--;
301 list_move_tail(&blk->list, &lun->bb_list);
302 lun->vlun.nr_bad_blocks++;
303 lun->vlun.nr_inuse_blocks--;
307 pr_err("gennvm: erroneous block type (%lu -> %u)\n",
309 list_move_tail(&blk->list, &lun->bb_list);
310 lun->vlun.nr_bad_blocks++;
311 lun->vlun.nr_inuse_blocks--;
314 spin_unlock(&vlun->lock);
317 static void gennvm_addr_to_generic_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
321 if (rqd->nr_pages > 1) {
322 for (i = 0; i < rqd->nr_pages; i++)
323 rqd->ppa_list[i] = dev_to_generic_addr(dev,
326 rqd->ppa_addr = dev_to_generic_addr(dev, rqd->ppa_addr);
330 static void gennvm_generic_to_addr_mode(struct nvm_dev *dev, struct nvm_rq *rqd)
334 if (rqd->nr_pages > 1) {
335 for (i = 0; i < rqd->nr_pages; i++)
336 rqd->ppa_list[i] = generic_to_dev_addr(dev,
339 rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
343 static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
345 if (!dev->ops->submit_io)
348 /* Convert address space */
349 gennvm_generic_to_addr_mode(dev, rqd);
352 return dev->ops->submit_io(dev->q, rqd);
355 static void gennvm_blk_set_type(struct nvm_dev *dev, struct ppa_addr *ppa,
358 struct gen_nvm *gn = dev->mp;
360 struct nvm_block *blk;
362 if (unlikely(ppa->g.ch > dev->nr_chnls ||
363 ppa->g.lun > dev->luns_per_chnl ||
364 ppa->g.blk > dev->blks_per_lun)) {
366 pr_err("gennvm: ppa broken (ch: %u > %u lun: %u > %u blk: %u > %u",
367 ppa->g.ch, dev->nr_chnls,
368 ppa->g.lun, dev->luns_per_chnl,
369 ppa->g.blk, dev->blks_per_lun);
373 lun = &gn->luns[ppa->g.lun * ppa->g.ch];
374 blk = &lun->vlun.blocks[ppa->g.blk];
376 /* will be moved to bb list on put_blk from target */
380 /* mark block bad. It is expected the target recover from the error. */
381 static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
385 if (!dev->ops->set_bb_tbl)
388 if (dev->ops->set_bb_tbl(dev->q, rqd, 1))
391 gennvm_addr_to_generic_mode(dev, rqd);
393 /* look up blocks and mark them as bad */
394 if (rqd->nr_pages > 1)
395 for (i = 0; i < rqd->nr_pages; i++)
396 gennvm_blk_set_type(dev, &rqd->ppa_list[i], 2);
398 gennvm_blk_set_type(dev, &rqd->ppa_addr, 2);
401 static int gennvm_end_io(struct nvm_rq *rqd, int error)
403 struct nvm_tgt_instance *ins = rqd->ins;
407 case NVM_RSP_SUCCESS:
409 case NVM_RSP_ERR_EMPTYPAGE:
411 case NVM_RSP_ERR_FAILWRITE:
412 gennvm_mark_blk_bad(rqd->dev, rqd);
417 ret += ins->tt->end_io(rqd, error);
422 static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
425 int plane_cnt = 0, pl_idx, ret;
426 struct ppa_addr addr;
429 if (!dev->ops->erase_block)
432 addr = block_to_ppa(dev, blk);
434 if (dev->plane_mode == NVM_PLANE_SINGLE) {
438 plane_cnt = (1 << dev->plane_mode);
439 rqd.nr_pages = plane_cnt;
441 rqd.ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL,
444 pr_err("gennvm: failed to allocate dma memory\n");
448 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) {
450 rqd.ppa_list[pl_idx] = addr;
454 gennvm_generic_to_addr_mode(dev, &rqd);
456 ret = dev->ops->erase_block(dev->q, &rqd);
459 nvm_dev_dma_free(dev, rqd.ppa_list, rqd.dma_ppa_list);
464 static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
466 struct gen_nvm *gn = dev->mp;
468 return &gn->luns[lunid].vlun;
471 static void gennvm_lun_info_print(struct nvm_dev *dev)
473 struct gen_nvm *gn = dev->mp;
478 gennvm_for_each_lun(gn, lun, i) {
479 spin_lock(&lun->vlun.lock);
481 pr_info("%s: lun%8u\t%u\t%u\t%u\n",
483 lun->vlun.nr_free_blocks,
484 lun->vlun.nr_inuse_blocks,
485 lun->vlun.nr_bad_blocks);
487 spin_unlock(&lun->vlun.lock);
491 static struct nvmm_type gennvm = {
493 .version = {0, 1, 0},
495 .register_mgr = gennvm_register,
496 .unregister_mgr = gennvm_unregister,
498 .get_blk = gennvm_get_blk,
499 .put_blk = gennvm_put_blk,
501 .submit_io = gennvm_submit_io,
502 .end_io = gennvm_end_io,
503 .erase_blk = gennvm_erase_blk,
505 .get_lun = gennvm_get_lun,
506 .lun_info_print = gennvm_lun_info_print,
509 static int __init gennvm_module_init(void)
511 return nvm_register_mgr(&gennvm);
514 static void gennvm_module_exit(void)
516 nvm_unregister_mgr(&gennvm);
519 module_init(gennvm_module_init);
520 module_exit(gennvm_module_exit);
521 MODULE_LICENSE("GPL v2");
522 MODULE_DESCRIPTION("Generic media manager for Open-Channel SSDs");