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Subject[PATCH 1/2] lightnvm: pblk: control I/O flow also on tear down
Date
When removing a pblk instance, control the write I/O flow to the
controller as we do in the fast path.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
---
drivers/lightnvm/pblk-core.c | 69 ++++++++++++++++++++++++++++++----------
drivers/lightnvm/pblk-recovery.c | 31 ++++++++++++------
drivers/lightnvm/pblk-write.c | 19 ++++-------
drivers/lightnvm/pblk.h | 2 ++
4 files changed, 82 insertions(+), 39 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 11fe0c5b2a9c..81501644fb15 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -1670,13 +1670,10 @@ void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
queue_work(wq, &line_ws->ws);
}

-void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
- unsigned long *lun_bitmap)
+static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
+ int nr_ppas, int pos)
{
- struct nvm_tgt_dev *dev = pblk->dev;
- struct nvm_geo *geo = &dev->geo;
- struct pblk_lun *rlun;
- int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
+ struct pblk_lun *rlun = &pblk->luns[pos];
int ret;

/*
@@ -1690,24 +1687,62 @@ void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
ppa_list[0].g.ch != ppa_list[i].g.ch);
#endif
+
+ ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
+ if (ret) {
+ switch (ret) {
+ case -ETIME:
+ pr_err("pblk: lun semaphore timed out\n");
+ break;
+ case -EINTR:
+ pr_err("pblk: lun semaphore timed out\n");
+ break;
+ }
+ }
+}
+
+void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
+{
+ struct nvm_tgt_dev *dev = pblk->dev;
+ struct nvm_geo *geo = &dev->geo;
+ int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
+
+ __pblk_down_page(pblk, ppa_list, nr_ppas, pos);
+}
+
+void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
+ unsigned long *lun_bitmap)
+{
+ struct nvm_tgt_dev *dev = pblk->dev;
+ struct nvm_geo *geo = &dev->geo;
+ int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
+
/* If the LUN has been locked for this same request, do no attempt to
* lock it again
*/
if (test_and_set_bit(pos, lun_bitmap))
return;

+ __pblk_down_page(pblk, ppa_list, nr_ppas, pos);
+}
+
+void pblk_up_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
+{
+ struct nvm_tgt_dev *dev = pblk->dev;
+ struct nvm_geo *geo = &dev->geo;
+ struct pblk_lun *rlun;
+ int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
+
+#ifdef CONFIG_NVM_DEBUG
+ int i;
+
+ for (i = 1; i < nr_ppas; i++)
+ WARN_ON(ppa_list[0].g.lun != ppa_list[i].g.lun ||
+ ppa_list[0].g.ch != ppa_list[i].g.ch);
+#endif
+
rlun = &pblk->luns[pos];
- ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(5000));
- if (ret) {
- switch (ret) {
- case -ETIME:
- pr_err("pblk: lun semaphore timed out\n");
- break;
- case -EINTR:
- pr_err("pblk: lun semaphore timed out\n");
- break;
- }
- }
+ up(&rlun->wr_sem);
}

void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index 0e48d3e4e143..cb556e06673e 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -340,9 +340,14 @@ static void pblk_end_io_recov(struct nvm_rq *rqd)
struct pblk *pblk = pad_rq->pblk;
struct nvm_tgt_dev *dev = pblk->dev;

- kref_put(&pad_rq->ref, pblk_recov_complete);
+ pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
+
+ bio_put(rqd->bio);
nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
pblk_free_rqd(pblk, rqd, WRITE);
+
+ atomic_dec(&pblk->inflight_io);
+ kref_put(&pad_rq->ref, pblk_recov_complete);
}

static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
@@ -385,7 +390,7 @@ static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
if (rq_ppas < pblk->min_write_pgs) {
pr_err("pblk: corrupted pad line %d\n", line->id);
- goto free_rq;
+ goto fail_free_pad;
}

rq_len = rq_ppas * geo->sec_size;
@@ -393,7 +398,7 @@ static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
if (!meta_list) {
ret = -ENOMEM;
- goto free_data;
+ goto fail_free_pad;
}

ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
@@ -404,9 +409,9 @@ static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
ret = PTR_ERR(rqd);
goto fail_free_meta;
}
- memset(rqd, 0, pblk_w_rq_size);

- bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
+ bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
+ PBLK_VMALLOC_META, GFP_KERNEL);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
goto fail_free_rqd;
@@ -453,15 +458,15 @@ static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
}

kref_get(&pad_rq->ref);
+ pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas);

ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: I/O submission failed: %d\n", ret);
- goto free_data;
+ pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
+ goto fail_free_bio;
}

- atomic_dec(&pblk->inflight_io);
-
left_line_ppas -= rq_ppas;
left_ppas -= rq_ppas;
if (left_ppas && left_line_ppas)
@@ -475,17 +480,23 @@ static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
ret = -ETIME;
}

+ if (!pblk_line_is_full(line))
+ pr_err("pblk: corrupted padded line: %d\n", line->id);
+
+ vfree(data);
free_rq:
kfree(pad_rq);
-free_data:
- vfree(data);
return ret;

+fail_free_bio:
+ bio_put(bio);
fail_free_rqd:
pblk_free_rqd(pblk, rqd, WRITE);
fail_free_meta:
nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
+fail_free_pad:
kfree(pad_rq);
+ vfree(data);
return ret;
}

diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index d62a8f4faaf4..cc2b9414d17c 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -178,15 +178,12 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
{
struct pblk *pblk = rqd->private;
struct nvm_tgt_dev *dev = pblk->dev;
- struct nvm_geo *geo = &dev->geo;
struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd);
struct pblk_line *line = m_ctx->private;
struct pblk_emeta *emeta = line->emeta;
- int pos = pblk_ppa_to_pos(geo, rqd->ppa_list[0]);
- struct pblk_lun *rlun = &pblk->luns[pos];
int sync;

- up(&rlun->wr_sem);
+ pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);

if (rqd->error) {
pblk_log_write_err(pblk, rqd);
@@ -203,6 +200,7 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
pblk->close_wq);

bio_put(rqd->bio);
+ nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
pblk_free_rqd(pblk, rqd, READ);

atomic_dec(&pblk->inflight_io);
@@ -367,7 +365,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
struct pblk_line_meta *lm = &pblk->lm;
struct pblk_emeta *emeta = meta_line->emeta;
struct pblk_g_ctx *m_ctx;
- struct pblk_lun *rlun;
struct bio *bio;
struct nvm_rq *rqd;
void *data;
@@ -411,13 +408,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
rqd->ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id);
}

- rlun = &pblk->luns[pblk_ppa_to_pos(geo, rqd->ppa_list[0])];
- ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(5000));
- if (ret) {
- pr_err("pblk: lun semaphore timed out (%d)\n", ret);
- goto fail_free_bio;
- }
-
emeta->mem += rq_len;
if (emeta->mem >= lm->emeta_len[0]) {
spin_lock(&l_mg->close_lock);
@@ -427,6 +417,8 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
spin_unlock(&l_mg->close_lock);
}

+ pblk_down_page(pblk, rqd->ppa_list, rqd->nr_ppas);
+
ret = pblk_submit_io(pblk, rqd);
if (ret) {
pr_err("pblk: emeta I/O submission failed: %d\n", ret);
@@ -436,10 +428,13 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
return NVM_IO_OK;

fail_rollback:
+ pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);
spin_lock(&l_mg->close_lock);
pblk_dealloc_page(pblk, meta_line, rq_ppas);
list_add(&meta_line->list, &meta_line->list);
spin_unlock(&l_mg->close_lock);
+
+ nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
fail_free_bio:
if (likely(l_mg->emeta_alloc_type == PBLK_VMALLOC_META))
bio_put(bio);
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 15931381348c..0c5692cc2f60 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -739,8 +739,10 @@ u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs);
int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
unsigned long secs_to_flush);
+void pblk_up_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas);
void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
unsigned long *lun_bitmap);
+void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas);
void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
unsigned long *lun_bitmap);
void pblk_end_bio_sync(struct bio *bio);
--
2.7.4
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