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Commit de93434f authored by Javier González's avatar Javier González Committed by Jens Axboe
Browse files

lightnvm: remove gen_lun abstraction 



The gen_lun abstraction in the generic media manager was conceived on
the assumption that a single target would instantiated on top of it.
This has complicated target design to implement multi-instances. Remove
this abstraction and move its logic to nvm_lun, which manages physical
lun geometry and operations.

Signed-off-by: default avatarJavier González <javier@cnexlabs.com>
Signed-off-by: default avatarMatias Bjørling <m@bjorling.me>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 98379a12

drivers/lightnvm/gennvm.c

+42 −43
Original line number Diff line number Diff line
@@ -223,13 +223,13 @@ static void gen_put_area(struct nvm_dev *dev, sector_t begin) 
static void gen_blocks_free(struct nvm_dev *dev)

{

	struct gen_dev *gn = dev->mp;

	struct gen_lun *lun;

	struct nvm_lun *lun;

	int i;



	gen_for_each_lun(gn, lun, i) {

		if (!lun->vlun.blocks)

		if (!lun->blocks)

			break;

		vfree(lun->vlun.blocks);

		vfree(lun->blocks);

	}

}
@@ -242,24 +242,24 @@ static void gen_luns_free(struct nvm_dev *dev) 


static int gen_luns_init(struct nvm_dev *dev, struct gen_dev *gn)

{

	struct gen_lun *lun;

	struct nvm_lun *lun;

	int i;



	gn->luns = kcalloc(dev->nr_luns, sizeof(struct gen_lun), GFP_KERNEL);

	gn->luns = kcalloc(dev->nr_luns, sizeof(struct nvm_lun), GFP_KERNEL);

	if (!gn->luns)

		return -ENOMEM;



	gen_for_each_lun(gn, lun, i) {

		spin_lock_init(&lun->vlun.lock);

		INIT_LIST_HEAD(&lun->free_list);

		INIT_LIST_HEAD(&lun->used_list);

		INIT_LIST_HEAD(&lun->bb_list);



		lun->reserved_blocks = 2; /* for GC only */

		lun->vlun.id = i;

		lun->vlun.lun_id = i % dev->luns_per_chnl;

		lun->vlun.chnl_id = i / dev->luns_per_chnl;

		lun->vlun.nr_free_blocks = dev->blks_per_lun;

		spin_lock_init(&lun->lock);



		lun->id = i;

		lun->lun_id = i % dev->luns_per_chnl;

		lun->chnl_id = i / dev->luns_per_chnl;

		lun->nr_free_blocks = dev->blks_per_lun;

	}

	return 0;

}
@@ -268,7 +268,7 @@ static int gen_block_bb(struct gen_dev *gn, struct ppa_addr ppa, 
							u8 *blks, int nr_blks)

{

	struct nvm_dev *dev = gn->dev;

	struct gen_lun *lun;

	struct nvm_lun *lun;

	struct nvm_block *blk;

	int i;
@@ -282,9 +282,10 @@ static int gen_block_bb(struct gen_dev *gn, struct ppa_addr ppa, 
		if (blks[i] == NVM_BLK_T_FREE)

			continue;



		blk = &lun->vlun.blocks[i];

		blk = &lun->blocks[i];

		list_move_tail(&blk->list, &lun->bb_list);

		lun->vlun.nr_free_blocks--;

		blk->state = NVM_BLK_ST_BAD;

		lun->nr_free_blocks--;

	}



	return 0;
@@ -295,7 +296,7 @@ static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private) 
	struct nvm_dev *dev = private;

	struct gen_dev *gn = dev->mp;

	u64 elba = slba + nlb;

	struct gen_lun *lun;

	struct nvm_lun *lun;

	struct nvm_block *blk;

	u64 i;

	int lun_id;
@@ -326,7 +327,7 @@ static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private) 


		/* Calculate block offset into lun */

		pba = pba - (dev->sec_per_lun * lun_id);

		blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];

		blk = &lun->blocks[div_u64(pba, dev->sec_per_blk)];



		if (!blk->state) {

			/* at this point, we don't know anything about the
@@ -335,7 +336,7 @@ static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private) 
			 */

			list_move_tail(&blk->list, &lun->used_list);

			blk->state = NVM_BLK_ST_TGT;

			lun->vlun.nr_free_blocks--;

			lun->nr_free_blocks--;

		}

	}
@@ -344,7 +345,7 @@ static int gen_block_map(u64 slba, u32 nlb, __le64 *entries, void *private) 


static int gen_blocks_init(struct nvm_dev *dev, struct gen_dev *gn)

{

	struct gen_lun *lun;

	struct nvm_lun *lun;

	struct nvm_block *block;

	sector_t lun_iter, blk_iter, cur_block_id = 0;

	int ret, nr_blks;
@@ -356,19 +357,19 @@ static int gen_blocks_init(struct nvm_dev *dev, struct gen_dev *gn) 
		return -ENOMEM;



	gen_for_each_lun(gn, lun, lun_iter) {

		lun->vlun.blocks = vzalloc(sizeof(struct nvm_block) *

		lun->blocks = vzalloc(sizeof(struct nvm_block) *

							dev->blks_per_lun);

		if (!lun->vlun.blocks) {

		if (!lun->blocks) {

			kfree(blks);

			return -ENOMEM;

		}



		for (blk_iter = 0; blk_iter < dev->blks_per_lun; blk_iter++) {

			block = &lun->vlun.blocks[blk_iter];

			block = &lun->blocks[blk_iter];



			INIT_LIST_HEAD(&block->list);



			block->lun = &lun->vlun;

			block->lun = lun;

			block->id = cur_block_id++;



			list_add_tail(&block->list, &lun->free_list);
@@ -378,8 +379,8 @@ static int gen_blocks_init(struct nvm_dev *dev, struct gen_dev *gn) 
			struct ppa_addr ppa;



			ppa.ppa = 0;

			ppa.g.ch = lun->vlun.chnl_id;

			ppa.g.lun = lun->vlun.lun_id;

			ppa.g.ch = lun->chnl_id;

			ppa.g.lun = lun->lun_id;



			ret = nvm_get_bb_tbl(dev, ppa, blks);

			if (ret)
@@ -468,41 +469,39 @@ static void gen_unregister(struct nvm_dev *dev) 
}



static struct nvm_block *gen_get_blk(struct nvm_dev *dev,

				struct nvm_lun *vlun, unsigned long flags)

				struct nvm_lun *lun, unsigned long flags)

{

	struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);

	struct nvm_block *blk = NULL;

	int is_gc = flags & NVM_IOTYPE_GC;



	spin_lock(&vlun->lock);

	spin_lock(&lun->lock);

	if (list_empty(&lun->free_list)) {

		pr_err_ratelimited("gen: lun %u have no free pages available",

								lun->vlun.id);

								lun->id);

		goto out;

	}



	if (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks)

	if (!is_gc && lun->nr_free_blocks < lun->reserved_blocks)

		goto out;



	blk = list_first_entry(&lun->free_list, struct nvm_block, list);



	list_move_tail(&blk->list, &lun->used_list);

	blk->state = NVM_BLK_ST_TGT;

	lun->vlun.nr_free_blocks--;

	lun->nr_free_blocks--;

out:

	spin_unlock(&vlun->lock);

	spin_unlock(&lun->lock);

	return blk;

}



static void gen_put_blk(struct nvm_dev *dev, struct nvm_block *blk)

{

	struct nvm_lun *vlun = blk->lun;

	struct gen_lun *lun = container_of(vlun, struct gen_lun, vlun);

	struct nvm_lun *lun = blk->lun;



	spin_lock(&vlun->lock);

	spin_lock(&lun->lock);

	if (blk->state & NVM_BLK_ST_TGT) {

		list_move_tail(&blk->list, &lun->free_list);

		lun->vlun.nr_free_blocks++;

		lun->nr_free_blocks++;

		blk->state = NVM_BLK_ST_FREE;

	} else if (blk->state & NVM_BLK_ST_BAD) {

		list_move_tail(&blk->list, &lun->bb_list);
@@ -513,13 +512,13 @@ static void gen_put_blk(struct nvm_dev *dev, struct nvm_block *blk) 
							blk->id, blk->state);

		list_move_tail(&blk->list, &lun->bb_list);

	}

	spin_unlock(&vlun->lock);

	spin_unlock(&lun->lock);

}



static void gen_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type)

{

	struct gen_dev *gn = dev->mp;

	struct gen_lun *lun;

	struct nvm_lun *lun;

	struct nvm_block *blk;



	pr_debug("gen: ppa  (ch: %u lun: %u blk: %u pg: %u) -> %u\n",
@@ -537,7 +536,7 @@ static void gen_mark_blk(struct nvm_dev *dev, struct ppa_addr ppa, int type) 
	}



	lun = &gn->luns[(dev->luns_per_chnl * ppa.g.ch) + ppa.g.lun];

	blk = &lun->vlun.blocks[ppa.g.blk];

	blk = &lun->blocks[ppa.g.blk];



	/* will be moved to bb list on put_blk from target */

	blk->state = type;
@@ -587,23 +586,23 @@ static struct nvm_lun *gen_get_lun(struct nvm_dev *dev, int lunid) 
	if (unlikely(lunid >= dev->nr_luns))

		return NULL;



	return &gn->luns[lunid].vlun;

	return &gn->luns[lunid];

}



static void gen_lun_info_print(struct nvm_dev *dev)

{

	struct gen_dev *gn = dev->mp;

	struct gen_lun *lun;

	struct nvm_lun *lun;

	unsigned int i;





	gen_for_each_lun(gn, lun, i) {

		spin_lock(&lun->vlun.lock);

		spin_lock(&lun->lock);



		pr_info("%s: lun%8u\t%u\n", dev->name, i,

						lun->vlun.nr_free_blocks);

						lun->nr_free_blocks);



		spin_unlock(&lun->vlun.lock);

		spin_unlock(&lun->lock);

	}

}

drivers/lightnvm/gennvm.h

+1 −15
Original line number Diff line number Diff line
@@ -20,25 +20,11 @@ 


#include <linux/lightnvm.h>



struct gen_lun {

	struct nvm_lun vlun;



	int reserved_blocks;

	/* lun block lists */

	struct list_head used_list;	/* In-use blocks */

	struct list_head free_list;	/* Not used blocks i.e. released

					 * and ready for use

					 */

	struct list_head bb_list;	/* Bad blocks. Mutually exclusive with

					 * free_list and used_list

					 */

};



struct gen_dev {

	struct nvm_dev *dev;



	int nr_luns;

	struct gen_lun *luns;

	struct nvm_lun *luns;

	struct list_head area_list;



	struct mutex lock;

include/linux/lightnvm.h

+10 −0
Original line number Diff line number Diff line
@@ -275,7 +275,17 @@ struct nvm_lun { 


	spinlock_t lock;



	/* lun block lists */

	struct list_head used_list;	/* In-use blocks */

	struct list_head free_list;	/* Not used blocks i.e. released

					 * and ready for use

					 */

	struct list_head bb_list;	/* Bad blocks. Mutually exclusive with

					 * free_list and used_list

					 */

	unsigned int nr_free_blocks;	/* Number of unused blocks */

	int reserved_blocks;



	struct nvm_block *blocks;

};