Re: [PATCH 2/4] lightnvm: move metadata mapping to lower level driver

From: Hans Holmberg
Date: Thu Aug 01 2019 - 03:16:25 EST

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On Wed, Jul 31, 2019 at 3:59 PM Javier GonzÃlez <javier@xxxxxxxxxxx> wrote:
>
> > On 31 Jul 2019, at 11.41, Hans Holmberg <hans@xxxxxxxxxxxxx> wrote:
> >
> > Now that blk_rq_map_kern can map both kmem and vmem, move
> > internal metadata mapping down to the lower level driver.
> >
> > Signed-off-by: Hans Holmberg <hans@xxxxxxxxxxxxx>
> > ---
> > drivers/lightnvm/core.c | 16 +++---
> > drivers/lightnvm/pblk-core.c | 113 +++++----------------------------------
> > drivers/lightnvm/pblk-read.c | 22 ++------
> > drivers/lightnvm/pblk-recovery.c | 39 ++------------
> > drivers/lightnvm/pblk-write.c | 20 ++-----
> > drivers/lightnvm/pblk.h | 8 +--
> > drivers/nvme/host/lightnvm.c | 20 +++++--
> > include/linux/lightnvm.h | 6 +--
> > 8 files changed, 54 insertions(+), 190 deletions(-)
> >
> > diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
> > index 01d098fb96ac..3cd03582a2ed 100644
> > --- a/drivers/lightnvm/core.c
> > +++ b/drivers/lightnvm/core.c
> > @@ -731,7 +731,7 @@ static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd)
> > return flags;
> > }
> >
> > -int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
> > +int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf)
> > {
> > struct nvm_dev *dev = tgt_dev->parent;
> > int ret;
> > @@ -745,7 +745,7 @@ int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
> > rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
> >
> > /* In case of error, fail with right address format */
> > - ret = dev->ops->submit_io(dev, rqd);
> > + ret = dev->ops->submit_io(dev, rqd, buf);
> > if (ret)
> > nvm_rq_dev_to_tgt(tgt_dev, rqd);
> > return ret;
> > @@ -759,7 +759,8 @@ static void nvm_sync_end_io(struct nvm_rq *rqd)
> > complete(waiting);
> > }
> >
> > -static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd)
> > +static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd,
> > + void *buf)
> > {
> > DECLARE_COMPLETION_ONSTACK(wait);
> > int ret = 0;
> > @@ -767,7 +768,7 @@ static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd)
> > rqd->end_io = nvm_sync_end_io;
> > rqd->private = &wait;
> >
> > - ret = dev->ops->submit_io(dev, rqd);
> > + ret = dev->ops->submit_io(dev, rqd, buf);
> > if (ret)
> > return ret;
> >
> > @@ -776,7 +777,8 @@ static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd)
> > return 0;
> > }
> >
> > -int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
> > +int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd,
> > + void *buf)
> > {
> > struct nvm_dev *dev = tgt_dev->parent;
> > int ret;
> > @@ -789,7 +791,7 @@ int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd)
> > rqd->dev = tgt_dev;
> > rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd);
> >
> > - ret = nvm_submit_io_wait(dev, rqd);
> > + ret = nvm_submit_io_wait(dev, rqd, buf);
> >
> > return ret;
> > }
> > @@ -816,7 +818,7 @@ static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd)
> > rqd->dev = NULL;
> > rqd->flags = nvm_set_flags(&dev->geo, rqd);
> >
> > - return nvm_submit_io_wait(dev, rqd);
> > + return nvm_submit_io_wait(dev, rqd, NULL);
> > }
> >
> > static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa)
> > diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> > index f546e6f28b8a..a58d3c84a3f2 100644
> > --- a/drivers/lightnvm/pblk-core.c
> > +++ b/drivers/lightnvm/pblk-core.c
> > @@ -507,7 +507,7 @@ void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
> > pblk->sec_per_write = sec_per_write;
> > }
> >
> > -int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
> > +int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd, void *buf)
> > {
> > struct nvm_tgt_dev *dev = pblk->dev;
> >
> > @@ -518,7 +518,7 @@ int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
> > return NVM_IO_ERR;
> > #endif
> >
> > - return nvm_submit_io(dev, rqd);
> > + return nvm_submit_io(dev, rqd, buf);
> > }
> >
> > void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd)
> > @@ -541,7 +541,7 @@ void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd)
> > }
> > }
> >
> > -int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
> > +int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd, void *buf)
> > {
> > struct nvm_tgt_dev *dev = pblk->dev;
> > int ret;
> > @@ -553,7 +553,7 @@ int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
> > return NVM_IO_ERR;
> > #endif
> >
> > - ret = nvm_submit_io_sync(dev, rqd);
> > + ret = nvm_submit_io_sync(dev, rqd, buf);
> >
> > if (trace_pblk_chunk_state_enabled() && !ret &&
> > rqd->opcode == NVM_OP_PWRITE)
> > @@ -562,65 +562,19 @@ int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd)
> > return ret;
> > }
> >
> > -int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd)
> > +static int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd,
> > + void *buf)
> > {
> > struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
> > int ret;
> >
> > pblk_down_chunk(pblk, ppa_list[0]);
> > - ret = pblk_submit_io_sync(pblk, rqd);
> > + ret = pblk_submit_io_sync(pblk, rqd, buf);
> > pblk_up_chunk(pblk, ppa_list[0]);
> >
> > return ret;
> > }
> >
> > -static void pblk_bio_map_addr_endio(struct bio *bio)
> > -{
> > - bio_put(bio);
> > -}
> > -
> > -struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
> > - unsigned int nr_secs, unsigned int len,
> > - int alloc_type, gfp_t gfp_mask)
> > -{
> > - struct nvm_tgt_dev *dev = pblk->dev;
> > - void *kaddr = data;
> > - struct page *page;
> > - struct bio *bio;
> > - int i, ret;
> > -
> > - if (alloc_type == PBLK_KMALLOC_META)
> > - return bio_map_kern(dev->q, kaddr, len, gfp_mask);
> > -
> > - bio = bio_kmalloc(gfp_mask, nr_secs);
> > - if (!bio)
> > - return ERR_PTR(-ENOMEM);
> > -
> > - for (i = 0; i < nr_secs; i++) {
> > - page = vmalloc_to_page(kaddr);
> > - if (!page) {
> > - pblk_err(pblk, "could not map vmalloc bio\n");
> > - bio_put(bio);
> > - bio = ERR_PTR(-ENOMEM);
> > - goto out;
> > - }
> > -
> > - ret = bio_add_pc_page(dev->q, bio, page, PAGE_SIZE, 0);
> > - if (ret != PAGE_SIZE) {
> > - pblk_err(pblk, "could not add page to bio\n");
> > - bio_put(bio);
> > - bio = ERR_PTR(-ENOMEM);
> > - goto out;
> > - }
> > -
> > - kaddr += PAGE_SIZE;
> > - }
> > -
> > - bio->bi_end_io = pblk_bio_map_addr_endio;
> > -out:
> > - return bio;
> > -}
> > -
> > int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
> > unsigned long secs_to_flush, bool skip_meta)
> > {
> > @@ -722,9 +676,7 @@ u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line)
> >
> > int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
> > {
> > - struct nvm_tgt_dev *dev = pblk->dev;
> > struct pblk_line_meta *lm = &pblk->lm;
> > - struct bio *bio;
> > struct ppa_addr *ppa_list;
> > struct nvm_rq rqd;
> > u64 paddr = pblk_line_smeta_start(pblk, line);
> > @@ -736,16 +688,6 @@ int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
> > if (ret)
> > return ret;
> >
> > - bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
> > - if (IS_ERR(bio)) {
> > - ret = PTR_ERR(bio);
> > - goto clear_rqd;
> > - }
> > -
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_READ, 0);
> > -
> > - rqd.bio = bio;
> > rqd.opcode = NVM_OP_PREAD;
> > rqd.nr_ppas = lm->smeta_sec;
> > rqd.is_seq = 1;
> > @@ -754,10 +696,9 @@ int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
> > for (i = 0; i < lm->smeta_sec; i++, paddr++)
> > ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
> >
> > - ret = pblk_submit_io_sync(pblk, &rqd);
> > + ret = pblk_submit_io_sync(pblk, &rqd, line->smeta);
> > if (ret) {
> > pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
> > - bio_put(bio);
> > goto clear_rqd;
> > }
> >
> > @@ -776,9 +717,7 @@ int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
> > static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line,
> > u64 paddr)
> > {
> > - struct nvm_tgt_dev *dev = pblk->dev;
> > struct pblk_line_meta *lm = &pblk->lm;
> > - struct bio *bio;
> > struct ppa_addr *ppa_list;
> > struct nvm_rq rqd;
> > __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
> > @@ -791,16 +730,6 @@ static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line,
> > if (ret)
> > return ret;
> >
> > - bio = bio_map_kern(dev->q, line->smeta, lm->smeta_len, GFP_KERNEL);
> > - if (IS_ERR(bio)) {
> > - ret = PTR_ERR(bio);
> > - goto clear_rqd;
> > - }
> > -
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
> > -
> > - rqd.bio = bio;
> > rqd.opcode = NVM_OP_PWRITE;
> > rqd.nr_ppas = lm->smeta_sec;
> > rqd.is_seq = 1;
> > @@ -814,10 +743,9 @@ static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line,
> > meta->lba = lba_list[paddr] = addr_empty;
> > }
> >
> > - ret = pblk_submit_io_sync_sem(pblk, &rqd);
> > + ret = pblk_submit_io_sync_sem(pblk, &rqd, line->smeta);
> > if (ret) {
> > pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
> > - bio_put(bio);
> > goto clear_rqd;
> > }
> >
> > @@ -838,10 +766,8 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
> > {
> > struct nvm_tgt_dev *dev = pblk->dev;
> > struct nvm_geo *geo = &dev->geo;
> > - struct pblk_line_mgmt *l_mg = &pblk->l_mg;
> > struct pblk_line_meta *lm = &pblk->lm;
> > void *ppa_list_buf, *meta_list;
> > - struct bio *bio;
> > struct ppa_addr *ppa_list;
> > struct nvm_rq rqd;
> > u64 paddr = line->emeta_ssec;
> > @@ -867,17 +793,6 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
> > rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false);
> > rq_len = rq_ppas * geo->csecs;
> >
> > - bio = pblk_bio_map_addr(pblk, emeta_buf, rq_ppas, rq_len,
> > - l_mg->emeta_alloc_type, GFP_KERNEL);
> > - if (IS_ERR(bio)) {
> > - ret = PTR_ERR(bio);
> > - goto free_rqd_dma;
> > - }
> > -
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_READ, 0);
> > -
> > - rqd.bio = bio;
> > rqd.meta_list = meta_list;
> > rqd.ppa_list = ppa_list_buf;
> > rqd.dma_meta_list = dma_meta_list;
> > @@ -896,7 +811,6 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
> > while (test_bit(pos, line->blk_bitmap)) {
> > paddr += min;
> > if (pblk_boundary_paddr_checks(pblk, paddr)) {
> > - bio_put(bio);
> > ret = -EINTR;
> > goto free_rqd_dma;
> > }
> > @@ -906,7 +820,6 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
> > }
> >
> > if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
> > - bio_put(bio);
> > ret = -EINTR;
> > goto free_rqd_dma;
> > }
> > @@ -915,10 +828,9 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
> > ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line_id);
> > }
> >
> > - ret = pblk_submit_io_sync(pblk, &rqd);
> > + ret = pblk_submit_io_sync(pblk, &rqd, emeta_buf);
> > if (ret) {
> > pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
> > - bio_put(bio);
> > goto free_rqd_dma;
> > }
> >
> > @@ -963,7 +875,7 @@ static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
> > /* The write thread schedules erases so that it minimizes disturbances
> > * with writes. Thus, there is no need to take the LUN semaphore.
> > */
> > - ret = pblk_submit_io_sync(pblk, &rqd);
> > + ret = pblk_submit_io_sync(pblk, &rqd, NULL);
> > rqd.private = pblk;
> > __pblk_end_io_erase(pblk, &rqd);
> >
> > @@ -1792,7 +1704,7 @@ int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
> > /* The write thread schedules erases so that it minimizes disturbances
> > * with writes. Thus, there is no need to take the LUN semaphore.
> > */
> > - err = pblk_submit_io(pblk, rqd);
> > + err = pblk_submit_io(pblk, rqd, NULL);
> > if (err) {
> > struct nvm_tgt_dev *dev = pblk->dev;
> > struct nvm_geo *geo = &dev->geo;
> > @@ -1923,7 +1835,6 @@ void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
> > static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
> > {
> > struct pblk_line_meta *lm = &pblk->lm;
> > - struct pblk_line_mgmt *l_mg = &pblk->l_mg;
> > unsigned int lba_list_size = lm->emeta_len[2];
> > struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
> > struct pblk_emeta *emeta = line->emeta;
> > diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
> > index d98ea392fe33..d572d4559e4e 100644
> > --- a/drivers/lightnvm/pblk-read.c
> > +++ b/drivers/lightnvm/pblk-read.c
> > @@ -342,7 +342,7 @@ void pblk_submit_read(struct pblk *pblk, struct bio *bio)
> > bio_put(int_bio);
> > int_bio = bio_clone_fast(bio, GFP_KERNEL, &pblk_bio_set);
> > goto split_retry;
> > - } else if (pblk_submit_io(pblk, rqd)) {
> > + } else if (pblk_submit_io(pblk, rqd, NULL)) {
> > /* Submitting IO to drive failed, let's report an error */
> > rqd->error = -ENODEV;
> > pblk_end_io_read(rqd);
> > @@ -419,7 +419,6 @@ int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
> > {
> > struct nvm_tgt_dev *dev = pblk->dev;
> > struct nvm_geo *geo = &dev->geo;
> > - struct bio *bio;
> > struct nvm_rq rqd;
> > int data_len;
> > int ret = NVM_IO_OK;
> > @@ -447,25 +446,12 @@ int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
> > goto out;
> >
> > data_len = (gc_rq->secs_to_gc) * geo->csecs;
> > - bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len,
> > - PBLK_VMALLOC_META, GFP_KERNEL);
> > - if (IS_ERR(bio)) {
> > - pblk_err(pblk, "could not allocate GC bio (%lu)\n",
> > - PTR_ERR(bio));
> > - ret = PTR_ERR(bio);
> > - goto err_free_dma;
> > - }
> > -
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_READ, 0);
> > -
> > rqd.opcode = NVM_OP_PREAD;
> > rqd.nr_ppas = gc_rq->secs_to_gc;
> > - rqd.bio = bio;
> >
> > - if (pblk_submit_io_sync(pblk, &rqd)) {
> > + if (pblk_submit_io_sync(pblk, &rqd, gc_rq->data)) {
> > ret = -EIO;
> > - goto err_free_bio;
> > + goto err_free_dma;
> > }
> >
> > pblk_read_check_rand(pblk, &rqd, gc_rq->lba_list, gc_rq->nr_secs);
> > @@ -489,8 +475,6 @@ int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq)
> > pblk_free_rqd_meta(pblk, &rqd);
> > return ret;
> >
> > -err_free_bio:
> > - bio_put(bio);
> > err_free_dma:
> > pblk_free_rqd_meta(pblk, &rqd);
> > return ret;
> > diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
> > index e6dda04de144..d5e210c3c5b7 100644
> > --- a/drivers/lightnvm/pblk-recovery.c
> > +++ b/drivers/lightnvm/pblk-recovery.c
> > @@ -178,12 +178,11 @@ static int pblk_recov_pad_line(struct pblk *pblk, struct pblk_line *line,
> > void *meta_list;
> > struct pblk_pad_rq *pad_rq;
> > struct nvm_rq *rqd;
> > - struct bio *bio;
> > struct ppa_addr *ppa_list;
> > void *data;
> > __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
> > u64 w_ptr = line->cur_sec;
> > - int left_line_ppas, rq_ppas, rq_len;
> > + int left_line_ppas, rq_ppas;
> > int i, j;
> > int ret = 0;
> >
> > @@ -212,28 +211,15 @@ static int pblk_recov_pad_line(struct pblk *pblk, struct pblk_line *line,
> > goto fail_complete;
> > }
> >
> > - rq_len = rq_ppas * geo->csecs;
> > -
> > - 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_complete;
> > - }
> > -
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
> > -
> > rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
> >
> > ret = pblk_alloc_rqd_meta(pblk, rqd);
> > if (ret) {
> > pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
> > - bio_put(bio);
> > goto fail_complete;
> > }
> >
> > - rqd->bio = bio;
> > + rqd->bio = NULL;
> > rqd->opcode = NVM_OP_PWRITE;
> > rqd->is_seq = 1;
> > rqd->nr_ppas = rq_ppas;
> > @@ -275,13 +261,12 @@ static int pblk_recov_pad_line(struct pblk *pblk, struct pblk_line *line,
> > kref_get(&pad_rq->ref);
> > pblk_down_chunk(pblk, ppa_list[0]);
> >
> > - ret = pblk_submit_io(pblk, rqd);
> > + ret = pblk_submit_io(pblk, rqd, data);
> > if (ret) {
> > pblk_err(pblk, "I/O submission failed: %d\n", ret);
> > pblk_up_chunk(pblk, ppa_list[0]);
> > kref_put(&pad_rq->ref, pblk_recov_complete);
> > pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
> > - bio_put(bio);
> > goto fail_complete;
> > }
> >
> > @@ -375,7 +360,6 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
> > struct ppa_addr *ppa_list;
> > void *meta_list;
> > struct nvm_rq *rqd;
> > - struct bio *bio;
> > void *data;
> > dma_addr_t dma_ppa_list, dma_meta_list;
> > __le64 *lba_list;
> > @@ -407,15 +391,7 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
> > rq_len = rq_ppas * geo->csecs;
> >
> > retry_rq:
> > - bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
> > - if (IS_ERR(bio))
> > - return PTR_ERR(bio);
> > -
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_READ, 0);
> > - bio_get(bio);
> > -
> > - rqd->bio = bio;
> > + rqd->bio = NULL;
> > rqd->opcode = NVM_OP_PREAD;
> > rqd->meta_list = meta_list;
> > rqd->nr_ppas = rq_ppas;
> > @@ -445,10 +421,9 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
> > addr_to_gen_ppa(pblk, paddr + j, line->id);
> > }
> >
> > - ret = pblk_submit_io_sync(pblk, rqd);
> > + ret = pblk_submit_io_sync(pblk, rqd, data);
> > if (ret) {
> > pblk_err(pblk, "I/O submission failed: %d\n", ret);
> > - bio_put(bio);
> > return ret;
> > }
> >
> > @@ -460,24 +435,20 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
> >
> > if (padded) {
> > pblk_log_read_err(pblk, rqd);
> > - bio_put(bio);
> > return -EINTR;
> > }
> >
> > pad_distance = pblk_pad_distance(pblk, line);
> > ret = pblk_recov_pad_line(pblk, line, pad_distance);
> > if (ret) {
> > - bio_put(bio);
> > return ret;
> > }
> >
> > padded = true;
> > - bio_put(bio);
> > goto retry_rq;
> > }
> >
> > pblk_get_packed_meta(pblk, rqd);
> > - bio_put(bio);
> >
> > for (i = 0; i < rqd->nr_ppas; i++) {
> > struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i);
> > diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
> > index 4e63f9b5954c..b9a2aeba95ab 100644
> > --- a/drivers/lightnvm/pblk-write.c
> > +++ b/drivers/lightnvm/pblk-write.c
> > @@ -373,7 +373,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
> > struct pblk_emeta *emeta = meta_line->emeta;
> > struct ppa_addr *ppa_list;
> > struct pblk_g_ctx *m_ctx;
> > - struct bio *bio;
> > struct nvm_rq *rqd;
> > void *data;
> > u64 paddr;
> > @@ -391,20 +390,9 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
> > rq_len = rq_ppas * geo->csecs;
> > data = ((void *)emeta->buf) + emeta->mem;
> >
> > - bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
> > - l_mg->emeta_alloc_type, GFP_KERNEL);
> > - if (IS_ERR(bio)) {
> > - pblk_err(pblk, "failed to map emeta io");
> > - ret = PTR_ERR(bio);
> > - goto fail_free_rqd;
> > - }
> > - bio->bi_iter.bi_sector = 0; /* internal bio */
> > - bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
> > - rqd->bio = bio;
> > -
> > ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta);
> > if (ret)
> > - goto fail_free_bio;
> > + goto fail_free_rqd;
> >
> > ppa_list = nvm_rq_to_ppa_list(rqd);
> > for (i = 0; i < rqd->nr_ppas; ) {
> > @@ -423,7 +411,7 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
> >
> > pblk_down_chunk(pblk, ppa_list[0]);
> >
> > - ret = pblk_submit_io(pblk, rqd);
> > + ret = pblk_submit_io(pblk, rqd, data);
> > if (ret) {
> > pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
> > goto fail_rollback;
> > @@ -437,8 +425,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
> > pblk_dealloc_page(pblk, meta_line, rq_ppas);
> > list_add(&meta_line->list, &meta_line->list);
> > spin_unlock(&l_mg->close_lock);
> > -fail_free_bio:
> > - bio_put(bio);
> > fail_free_rqd:
> > pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
> > return ret;
> > @@ -523,7 +509,7 @@ static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd)
> > meta_line = pblk_should_submit_meta_io(pblk, rqd);
> >
> > /* Submit data write for current data line */
> > - err = pblk_submit_io(pblk, rqd);
> > + err = pblk_submit_io(pblk, rqd, NULL);
> > if (err) {
> > pblk_err(pblk, "data I/O submission failed: %d\n", err);
> > return NVM_IO_ERR;
> > diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> > index a67855387f53..d515d3409a74 100644
> > --- a/drivers/lightnvm/pblk.h
> > +++ b/drivers/lightnvm/pblk.h
> > @@ -783,14 +783,10 @@ struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
> > struct ppa_addr ppa);
> > void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd);
> > void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd);
> > -int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd);
> > -int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd);
> > -int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd);
> > +int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd, void *buf);
> > +int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd, void *buf);
> > int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line);
> > void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd);
> > -struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
> > - unsigned int nr_secs, unsigned int len,
> > - int alloc_type, gfp_t gfp_mask);
> > struct pblk_line *pblk_line_get(struct pblk *pblk);
> > struct pblk_line *pblk_line_get_first_data(struct pblk *pblk);
> > struct pblk_line *pblk_line_replace_data(struct pblk *pblk);
> > diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
> > index d6f121452d5d..ec46693f6b64 100644
> > --- a/drivers/nvme/host/lightnvm.c
> > +++ b/drivers/nvme/host/lightnvm.c
> > @@ -667,11 +667,14 @@ static struct request *nvme_nvm_alloc_request(struct request_queue *q,
> > return rq;
> > }
> >
> > -static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
> > +static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd,
> > + void *buf)
> > {
> > + struct nvm_geo *geo = &dev->geo;
> > struct request_queue *q = dev->q;
> > struct nvme_nvm_command *cmd;
> > struct request *rq;
> > + int ret;
> >
> > cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
> > if (!cmd)
> > @@ -679,8 +682,15 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
> >
> > rq = nvme_nvm_alloc_request(q, rqd, cmd);
> > if (IS_ERR(rq)) {
> > - kfree(cmd);
> > - return PTR_ERR(rq);
> > + ret = PTR_ERR(rq);
> > + goto err_free_cmd;
> > + }
> > +
> > + if (buf) {
> > + ret = blk_rq_map_kern(q, rq, buf, geo->csecs * rqd->nr_ppas,
> > + GFP_KERNEL);
> > + if (ret)
> > + goto err_free_cmd;
> > }
> >
> > rq->end_io_data = rqd;
> > @@ -688,6 +698,10 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
> > blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io);
> >
> > return 0;
> > +
> > +err_free_cmd:
> > + kfree(cmd);
> > + return ret;
> > }
> >
> > static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name,
> > diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
> > index 8891647b24b1..ee8ec2e68055 100644
> > --- a/include/linux/lightnvm.h
> > +++ b/include/linux/lightnvm.h
> > @@ -88,7 +88,7 @@ typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *);
> > typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int);
> > typedef int (nvm_get_chk_meta_fn)(struct nvm_dev *, sector_t, int,
> > struct nvm_chk_meta *);
> > -typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
> > +typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *, void *);
> > typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *, int);
> > typedef void (nvm_destroy_dma_pool_fn)(void *);
> > typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
> > @@ -680,8 +680,8 @@ extern int nvm_get_chunk_meta(struct nvm_tgt_dev *, struct ppa_addr,
> > int, struct nvm_chk_meta *);
> > extern int nvm_set_chunk_meta(struct nvm_tgt_dev *, struct ppa_addr *,
> > int, int);
> > -extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *);
> > -extern int nvm_submit_io_sync(struct nvm_tgt_dev *, struct nvm_rq *);
> > +extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *, void *);
> > +extern int nvm_submit_io_sync(struct nvm_tgt_dev *, struct nvm_rq *, void *);
> > extern void nvm_end_io(struct nvm_rq *);
> >
> > #else /* CONFIG_NVM */
> > --
> > 2.7.4
>
> Itâs very good to get rid of pblk_bio_map_addr(). Need to look at this
> closer because I remember a number of corner cases due to the metadata
> allocation. Have you tested the vmalloc allocation path? Note that you
> need big lines for this to happen as it will try to do kmalloc if
> possible

Yeah, i checked that vmalloc worked for the emeta buffers(by switching
over manually), so we should be good.

>
> Javier

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