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SubjectRe: [PATCH 6/8] lightnvm: pblk: implement get log report chunk
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On 02/13/2018 03:06 PM, Javier González wrote:
> From: Javier González <javier@javigon.com>
>
> In preparation of pblk supporting 2.0, implement the get log report
> chunk in pblk.
>
> This patch only replicates de bad block functionality as the rest of the
> metadata requires new pblk functionality (e.g., wear-index to implement
> wear-leveling). This functionality will come in future patches.
>
> Signed-off-by: Javier González <javier@cnexlabs.com>
> ---
> drivers/lightnvm/pblk-core.c | 118 +++++++++++++++++++++++----
> drivers/lightnvm/pblk-init.c | 186 +++++++++++++++++++++++++++++++-----------
> drivers/lightnvm/pblk-sysfs.c | 67 +++++++++++++++
> drivers/lightnvm/pblk.h | 20 +++++
> 4 files changed, 327 insertions(+), 64 deletions(-)
>
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index 519af8b9eab7..01b78ee5c0e0 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -44,11 +44,12 @@ static void pblk_line_mark_bb(struct work_struct *work)
> }
>
> static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
> - struct ppa_addr *ppa)
> + struct ppa_addr ppa_addr)
> {
> struct nvm_tgt_dev *dev = pblk->dev;
> struct nvm_geo *geo = &dev->geo;
> - int pos = pblk_ppa_to_pos(geo, *ppa);
> + struct ppa_addr *ppa;
> + int pos = pblk_ppa_to_pos(geo, ppa_addr);
>
> pr_debug("pblk: erase failed: line:%d, pos:%d\n", line->id, pos);
> atomic_long_inc(&pblk->erase_failed);
> @@ -58,6 +59,15 @@ static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
> pr_err("pblk: attempted to erase bb: line:%d, pos:%d\n",
> line->id, pos);
>
> + /* Not necessary to mark bad blocks on 2.0 spec. */
> + if (geo->c.version == NVM_OCSSD_SPEC_20)
> + return;
> +
> + ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
> + if (!ppa)
> + return;
> +
> + *ppa = ppa_addr;
> pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb,
> GFP_ATOMIC, pblk->bb_wq);
> }
> @@ -69,16 +79,8 @@ static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
> line = &pblk->lines[pblk_ppa_to_line(rqd->ppa_addr)];
> atomic_dec(&line->left_seblks);
>
> - if (rqd->error) {
> - struct ppa_addr *ppa;
> -
> - ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
> - if (!ppa)
> - return;
> -
> - *ppa = rqd->ppa_addr;
> - pblk_mark_bb(pblk, line, ppa);
> - }
> + if (rqd->error)
> + pblk_mark_bb(pblk, line, rqd->ppa_addr);
>
> atomic_dec(&pblk->inflight_io);
> }
> @@ -92,6 +94,47 @@ static void pblk_end_io_erase(struct nvm_rq *rqd)
> mempool_free(rqd, pblk->e_rq_pool);
> }
>
> +/*
> + * Get information for all chunks from the device.
> + *
> + * The caller is responsible for freeing the returned structure
> + */
> +struct nvm_chunk_log_page *pblk_chunk_get_info(struct pblk *pblk)
> +{
> + struct nvm_tgt_dev *dev = pblk->dev;
> + struct nvm_geo *geo = &dev->geo;
> + struct nvm_chunk_log_page *log;
> + unsigned long len;
> + int ret;
> +
> + len = geo->all_chunks * sizeof(*log);
> + log = kzalloc(len, GFP_KERNEL);
> + if (!log)
> + return ERR_PTR(-ENOMEM);
> +
> + ret = nvm_get_chunk_log_page(dev, log, 0, len);
> + if (ret) {
> + pr_err("pblk: could not get chunk log page (%d)\n", ret);
> + kfree(log);
> + return ERR_PTR(-EIO);
> + }
> +
> + return log;
> +}
> +
> +struct nvm_chunk_log_page *pblk_chunk_get_off(struct pblk *pblk,
> + struct nvm_chunk_log_page *lp,
> + struct ppa_addr ppa)
> +{
> + struct nvm_tgt_dev *dev = pblk->dev;
> + struct nvm_geo *geo = &dev->geo;
> + int ch_off = ppa.m.ch * geo->c.num_chk * geo->num_lun;
> + int lun_off = ppa.m.lun * geo->c.num_chk;
> + int chk_off = ppa.m.chk;
> +
> + return lp + ch_off + lun_off + chk_off;
> +}
> +
> void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
> u64 paddr)
> {
> @@ -1094,10 +1137,38 @@ static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
> return 1;
> }
>
> +static int pblk_prepare_new_line(struct pblk *pblk, struct pblk_line *line)
> +{
> + struct pblk_line_meta *lm = &pblk->lm;
> + struct nvm_tgt_dev *dev = pblk->dev;
> + struct nvm_geo *geo = &dev->geo;
> + int blk_to_erase = atomic_read(&line->blk_in_line);
> + int i;
> +
> + for (i = 0; i < lm->blk_per_line; i++) {
> + int state = line->chks[i].state;
> + struct pblk_lun *rlun = &pblk->luns[i];
> +
> + /* Free chunks should not be erased */
> + if (state & NVM_CHK_ST_FREE) {
> + set_bit(pblk_ppa_to_pos(geo, rlun->chunk_bppa),
> + line->erase_bitmap);
> + blk_to_erase--;
> + line->chks[i].state = NVM_CHK_ST_HOST_USE;
> + }
> +
> + WARN_ONCE(state & NVM_CHK_ST_OPEN,
> + "pblk: open chunk in new line: %d\n",
> + line->id);
> + }
> +
> + return blk_to_erase;
> +}
> +
> static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
> {
> struct pblk_line_meta *lm = &pblk->lm;
> - int blk_in_line = atomic_read(&line->blk_in_line);
> + int blk_to_erase;
>
> line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC);
> if (!line->map_bitmap)
> @@ -1110,7 +1181,21 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
> return -ENOMEM;
> }
>
> + /* Bad blocks do not need to be erased */
> + bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
> +
> spin_lock(&line->lock);
> +
> + /* If we have not written to this line, we need to mark up free chunks
> + * as already erased
> + */
> + if (line->state == PBLK_LINESTATE_NEW) {
> + blk_to_erase = pblk_prepare_new_line(pblk, line);
> + line->state = PBLK_LINESTATE_FREE;
> + } else {
> + blk_to_erase = atomic_read(&line->blk_in_line);
> + }
> +
> if (line->state != PBLK_LINESTATE_FREE) {
> kfree(line->map_bitmap);
> kfree(line->invalid_bitmap);
> @@ -1122,15 +1207,12 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
>
> line->state = PBLK_LINESTATE_OPEN;
>
> - atomic_set(&line->left_eblks, blk_in_line);
> - atomic_set(&line->left_seblks, blk_in_line);
> + atomic_set(&line->left_eblks, blk_to_erase);
> + atomic_set(&line->left_seblks, blk_to_erase);
>
> line->meta_distance = lm->meta_distance;
> spin_unlock(&line->lock);
>
> - /* Bad blocks do not need to be erased */
> - bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
> -
> kref_init(&line->ref);
>
> return 0;
> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
> index 72b7902e5d1c..dfc68718e27e 100644
> --- a/drivers/lightnvm/pblk-init.c
> +++ b/drivers/lightnvm/pblk-init.c
> @@ -402,6 +402,7 @@ static void pblk_line_meta_free(struct pblk_line *line)
> {
> kfree(line->blk_bitmap);
> kfree(line->erase_bitmap);
> + kfree(line->chks);
> }
>
> static void pblk_lines_free(struct pblk *pblk)
> @@ -470,25 +471,15 @@ static void *pblk_bb_get_log(struct pblk *pblk)
> return log;
> }
>
> -static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line,
> - u8 *bb_log, int blk_per_line)
> +static void *pblk_chunk_get_log(struct pblk *pblk)
> {
> struct nvm_tgt_dev *dev = pblk->dev;
> struct nvm_geo *geo = &dev->geo;
> - int i, bb_cnt = 0;
>
> - for (i = 0; i < blk_per_line; i++) {
> - struct pblk_lun *rlun = &pblk->luns[i];
> - u8 *lun_bb_log = bb_log + i * blk_per_line;
> -
> - if (lun_bb_log[line->id] == NVM_BLK_T_FREE)
> - continue;
> -
> - set_bit(pblk_ppa_to_pos(geo, rlun->bppa), line->blk_bitmap);
> - bb_cnt++;
> - }
> -
> - return bb_cnt;
> + if (geo->c.version == NVM_OCSSD_SPEC_12)
> + return pblk_bb_get_log(pblk);
> + else
> + return pblk_chunk_get_info(pblk);
> }
>
> static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
> @@ -517,6 +508,7 @@ static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns)
>
> rlun = &pblk->luns[i];
> rlun->bppa = luns[lunid];
> + rlun->chunk_bppa = luns[i];
>
> sema_init(&rlun->wr_sem, 1);
> }
> @@ -696,8 +688,125 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk)
> return -ENOMEM;
> }
>
> -static int pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
> - void *chunk_log, long *nr_bad_blks)
> +static int pblk_setup_line_meta_12(struct pblk *pblk, struct pblk_line *line,
> + void *chunk_log)
> +{
> + struct nvm_tgt_dev *dev = pblk->dev;
> + struct nvm_geo *geo = &dev->geo;
> + struct pblk_line_meta *lm = &pblk->lm;
> + int i, chk_per_lun, nr_bad_chks = 0;
> +
> + chk_per_lun = geo->c.num_chk * geo->c.pln_mode;
> +
> + for (i = 0; i < lm->blk_per_line; i++) {
> + struct pblk_chunk *chunk = &line->chks[i];
> + struct pblk_lun *rlun = &pblk->luns[i];
> + u8 *lun_bb_log = chunk_log + i * chk_per_lun;
> +
> + /*
> + * In 1.2 spec. chunk state is not persisted by the device. Thus
> + * some of the values are reset each time pblk is instantiated.
> + */
> + if (lun_bb_log[line->id] == NVM_BLK_T_FREE)
> + chunk->state = NVM_CHK_ST_HOST_USE;
> + else
> + chunk->state = NVM_CHK_ST_OFFLINE;
> +
> + chunk->type = NVM_CHK_TP_W_SEQ;
> + chunk->wi = 0;
> + chunk->slba = -1;
> + chunk->cnlb = geo->c.clba;
> + chunk->wp = 0;
> +
> + if (!(chunk->state & NVM_CHK_ST_OFFLINE))
> + continue;
> +
> + set_bit(pblk_ppa_to_pos(geo, rlun->bppa), line->blk_bitmap);
> + nr_bad_chks++;
> + }
> +
> + return nr_bad_chks;
> +}
> +
> +static int pblk_setup_line_meta_20(struct pblk *pblk, struct pblk_line *line,
> + struct nvm_chunk_log_page *log_page)
> +{
> + struct nvm_tgt_dev *dev = pblk->dev;
> + struct nvm_geo *geo = &dev->geo;
> + struct pblk_line_meta *lm = &pblk->lm;
> + int i, nr_bad_chks = 0;
> +
> + for (i = 0; i < lm->blk_per_line; i++) {
> + struct pblk_chunk *chunk = &line->chks[i];
> + struct pblk_lun *rlun = &pblk->luns[i];
> + struct nvm_chunk_log_page *chunk_log_page;
> + struct ppa_addr ppa;
> +
> + ppa = rlun->chunk_bppa;
> + ppa.m.chk = line->id;
> + chunk_log_page = pblk_chunk_get_off(pblk, log_page, ppa);
> +
> + chunk->state = chunk_log_page->state;
> + chunk->type = chunk_log_page->type;
> + chunk->wi = chunk_log_page->wear_index;
> + chunk->slba = le64_to_cpu(chunk_log_page->slba);
> + chunk->cnlb = le64_to_cpu(chunk_log_page->cnlb);
> + chunk->wp = le64_to_cpu(chunk_log_page->wp);
> +
> + if (!(chunk->state & NVM_CHK_ST_OFFLINE))
> + continue;
> +
> + if (chunk->type & NVM_CHK_TP_SZ_SPEC) {
> + WARN_ONCE(1, "pblk: custom-sized chunks unsupported\n");
> + continue;
> + }
> +
> + set_bit(pblk_ppa_to_pos(geo, rlun->chunk_bppa),
> + line->blk_bitmap);
> + nr_bad_chks++;
> + }
> +
> + return nr_bad_chks;
> +}
> +

The device chunk to nvm_chunk logic belongs in the lightnvm core. A
target should preferably not handle the case between 1.2 and 2.0 interface.


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