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Subject[PATCH 23/23] lightnvm: transform target get/set bad block
Date
From: Javier González <javier@cnexlabs.com>

Since targets are given a virtual target device, it is necessary to
translate all communication between targets and the backend device.
Implement the translation layer for get/set bad block table.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
---
drivers/lightnvm/core.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/lightnvm/gennvm.c | 19 +++++++++++-----
drivers/lightnvm/rrpc.c | 4 ++--
include/linux/lightnvm.h | 15 +++++++++---
4 files changed, 85 insertions(+), 11 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 07bf989..7622e3d 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -175,6 +175,26 @@ static struct nvm_dev *nvm_find_nvm_dev(const char *name)
return NULL;
}

+static void nvm_tgt_generic_to_addr_mode(struct nvm_tgt_dev *tgt_dev,
+ struct nvm_rq *rqd)
+{
+ struct nvm_dev *dev = tgt_dev->parent;
+ int i;
+
+ if (rqd->nr_ppas > 1) {
+ for (i = 0; i < rqd->nr_ppas; i++) {
+ rqd->ppa_list[i] = dev->mt->trans_ppa(tgt_dev,
+ rqd->ppa_list[i], TRANS_TGT_TO_DEV);
+ rqd->ppa_list[i] = generic_to_dev_addr(dev,
+ rqd->ppa_list[i]);
+ }
+ } else {
+ rqd->ppa_addr = dev->mt->trans_ppa(tgt_dev, rqd->ppa_addr,
+ TRANS_TGT_TO_DEV);
+ rqd->ppa_addr = generic_to_dev_addr(dev, rqd->ppa_addr);
+ }
+}
+
int nvm_set_bb_tbl(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas,
int type)
{
@@ -202,6 +222,34 @@ int nvm_set_bb_tbl(struct nvm_dev *dev, struct ppa_addr *ppas, int nr_ppas,
}
EXPORT_SYMBOL(nvm_set_bb_tbl);

+int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
+ int nr_ppas, int type)
+{
+ struct nvm_dev *dev = tgt_dev->parent;
+ struct nvm_rq rqd;
+ int ret;
+
+ if (nr_ppas > dev->ops->max_phys_sect) {
+ pr_err("nvm: unable to update all blocks atomically\n");
+ return -EINVAL;
+ }
+
+ memset(&rqd, 0, sizeof(struct nvm_rq));
+
+ nvm_set_rqd_ppalist(dev, &rqd, ppas, nr_ppas, 1);
+ nvm_tgt_generic_to_addr_mode(tgt_dev, &rqd);
+
+ ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type);
+ nvm_free_rqd_ppalist(dev, &rqd);
+ if (ret) {
+ pr_err("nvm: sysblk failed bb mark\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(nvm_set_tgt_bb_tbl);
+
int nvm_max_phys_sects(struct nvm_tgt_dev *tgt_dev)
{
struct nvm_dev *dev = tgt_dev->parent;
@@ -519,6 +567,16 @@ int nvm_get_bb_tbl(struct nvm_dev *dev, struct ppa_addr ppa, u8 *blks)
}
EXPORT_SYMBOL(nvm_get_bb_tbl);

+int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa,
+ u8 *blks)
+{
+ struct nvm_dev *dev = tgt_dev->parent;
+
+ ppa = dev->mt->trans_ppa(tgt_dev, ppa, TRANS_TGT_TO_DEV);
+ return nvm_get_bb_tbl(dev, ppa, blks);
+}
+EXPORT_SYMBOL(nvm_get_tgt_bb_tbl);
+
static int nvm_init_slc_tbl(struct nvm_dev *dev, struct nvm_id_group *grp)
{
struct nvm_geo *geo = &dev->geo;
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index befa828..ca78800 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -482,12 +482,6 @@ static void gen_unregister(struct nvm_dev *dev)
module_put(THIS_MODULE);
}

-enum {
- TRANS_TGT_TO_DEV = 0x0,
- TRANS_DEV_TO_TGT = 0x1,
-};
-
-
static int gen_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p)
{
struct gen_dev_map *dev_map = tgt_dev->map;
@@ -584,6 +578,18 @@ static int gen_erase_blk(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p,
return nvm_erase_ppa(tgt_dev->parent, p, 1, flags);
}

+static struct ppa_addr gen_trans_ppa(struct nvm_tgt_dev *tgt_dev,
+ struct ppa_addr p, int direction)
+{
+ gen_trans_fn *f;
+ struct ppa_addr ppa = p;
+
+ f = (direction == TRANS_TGT_TO_DEV) ? gen_map_to_dev : gen_map_to_tgt;
+ f(tgt_dev, &ppa);
+
+ return ppa;
+}
+
static void gen_part_to_tgt(struct nvm_dev *dev, sector_t *entries,
int len)
{
@@ -631,6 +637,7 @@ static struct nvmm_type gen = {
.get_area = gen_get_area,
.put_area = gen_put_area,

+ .trans_ppa = gen_trans_ppa,
.part_to_tgt = gen_part_to_tgt,
};

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 8a27bcc..9fb7de3 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -735,7 +735,7 @@ static void __rrpc_mark_bad_block(struct rrpc *rrpc, struct ppa_addr ppa)
rblk = &rlun->blocks[ppa.g.blk];
rblk->state = NVM_BLK_ST_BAD;

- nvm_set_bb_tbl(dev->parent, &ppa, 1, NVM_BLK_T_GRWN_BAD);
+ nvm_set_tgt_bb_tbl(dev, &ppa, 1, NVM_BLK_T_GRWN_BAD);
}

static void rrpc_mark_bad_block(struct rrpc *rrpc, struct nvm_rq *rqd)
@@ -1267,7 +1267,7 @@ static int rrpc_bb_discovery(struct nvm_tgt_dev *dev, struct rrpc_lun *rlun)
ppa.g.ch = rlun->bppa.g.ch;
ppa.g.lun = rlun->bppa.g.lun;

- ret = nvm_get_bb_tbl(dev->parent, ppa, blks);
+ ret = nvm_get_tgt_bb_tbl(dev, ppa, blks);
if (ret) {
pr_err("rrpc: could not get BB table\n");
goto out;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index e76f9c4..7c273bb 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -496,8 +496,15 @@ typedef int (nvmm_submit_io_fn)(struct nvm_tgt_dev *, struct nvm_rq *);
typedef int (nvmm_erase_blk_fn)(struct nvm_tgt_dev *, struct ppa_addr *, int);
typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
typedef void (nvmm_put_area_fn)(struct nvm_dev *, sector_t);
+typedef struct ppa_addr (nvmm_trans_ppa_fn)(struct nvm_tgt_dev *,
+ struct ppa_addr, int);
typedef void (nvmm_part_to_tgt_fn)(struct nvm_dev *, sector_t*, int);

+enum {
+ TRANS_TGT_TO_DEV = 0x0,
+ TRANS_DEV_TO_TGT = 0x1,
+};
+
struct nvmm_type {
const char *name;
unsigned int version[3];
@@ -514,6 +521,7 @@ struct nvmm_type {
nvmm_get_area_fn *get_area;
nvmm_put_area_fn *put_area;

+ nvmm_trans_ppa_fn *trans_ppa;
nvmm_part_to_tgt_fn *part_to_tgt;

struct list_head list;
@@ -526,9 +534,9 @@ extern struct nvm_dev *nvm_alloc_dev(int);
extern int nvm_register(struct nvm_dev *);
extern void nvm_unregister(struct nvm_dev *);

-extern int nvm_set_bb_tbl(struct nvm_dev *dev, struct ppa_addr *ppas,
- int nr_ppas, int type);
-
+extern int nvm_set_bb_tbl(struct nvm_dev *, struct ppa_addr *, int, int);
+extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *,
+ int, int);
extern int nvm_max_phys_sects(struct nvm_tgt_dev *);
extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *);
extern void nvm_generic_to_addr_mode(struct nvm_dev *, struct nvm_rq *);
@@ -549,6 +557,7 @@ extern int nvm_submit_ppa_list(struct nvm_dev *, struct ppa_addr *, int, int,
int, void *, int);
extern int nvm_bb_tbl_fold(struct nvm_dev *, u8 *, int);
extern int nvm_get_bb_tbl(struct nvm_dev *, struct ppa_addr, u8 *);
+extern int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr, u8 *);

/* sysblk.c */
#define NVM_SYSBLK_MAGIC 0x4E564D53 /* "NVMS" */
--
2.9.3
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