Date:   Fri, 20 Apr 2018 18:49:39 +0000
From:   Javier Gonzalez <javier@...xlabs.com>
To:     Hans Holmberg <hans.ml.holmberg@...tronix.com>
CC:     Matias Bjørling <mb@...htnvm.io>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: Re: [PATCH 2/3] lightnvm: pblk: garbage collect lines with failed
 writes

> On 19 Apr 2018, at 09.39, Hans Holmberg <hans.ml.holmberg@...tronix.com> wrote:
> 
> From: Hans Holmberg <hans.holmberg@...xlabs.com>
> 
> Write failures should not happen under normal circumstances,
> so in order to bring the chunk back into a known state as soon
> as possible, evacuate all the valid data out of the line and let the
> fw judge if the block can be written to in the next reset cycle.
> 
> Do this by introducing a new gc list for lines with failed writes,
> and ensure that the rate limiter allocates a small portion of
> the write bandwidth to get the job done.
> 
> The lba list is saved in memory for use during gc as we
> cannot gurantee that the emeta data is readable if a write
> error occurred.
> 
> Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
> ---
> drivers/lightnvm/pblk-core.c  | 43 +++++++++++++++++++++--
> drivers/lightnvm/pblk-gc.c    | 79 +++++++++++++++++++++++++++----------------
> drivers/lightnvm/pblk-init.c  | 39 ++++++++++++++-------
> drivers/lightnvm/pblk-rl.c    | 29 +++++++++++++---
> drivers/lightnvm/pblk-sysfs.c | 15 ++++++--
> drivers/lightnvm/pblk-write.c |  2 ++
> drivers/lightnvm/pblk.h       | 25 +++++++++++---
> 7 files changed, 178 insertions(+), 54 deletions(-)
> 
> diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
> index 7762e89..f6135e4 100644
> --- a/drivers/lightnvm/pblk-core.c
> +++ b/drivers/lightnvm/pblk-core.c
> @@ -373,7 +373,13 @@ struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
> 
> 	lockdep_assert_held(&line->lock);
> 
> -	if (!vsc) {
> +	if (line->w_err_gc->has_write_err) {
> +		if (line->gc_group != PBLK_LINEGC_WERR) {
> +			line->gc_group = PBLK_LINEGC_WERR;
> +			move_list = &l_mg->gc_werr_list;
> +			pblk_rl_werr_line_in(&pblk->rl);
> +		}
> +	} else if (!vsc) {
> 		if (line->gc_group != PBLK_LINEGC_FULL) {
> 			line->gc_group = PBLK_LINEGC_FULL;
> 			move_list = &l_mg->gc_full_list;
> @@ -1603,8 +1609,13 @@ static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
> 	line->state = PBLK_LINESTATE_FREE;
> 	line->gc_group = PBLK_LINEGC_NONE;
> 	pblk_line_free(line);
> -	spin_unlock(&line->lock);
> 
> +	if (line->w_err_gc->has_write_err) {
> +		pblk_rl_werr_line_out(&pblk->rl);
> +		line->w_err_gc->has_write_err = 0;
> +	}
> +
> +	spin_unlock(&line->lock);
> 	atomic_dec(&gc->pipeline_gc);
> 
> 	spin_lock(&l_mg->free_lock);
> @@ -1767,11 +1778,32 @@ void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
> 
> 	spin_lock(&l_mg->close_lock);
> 	spin_lock(&line->lock);
> +
> +	/* Update the in-memory start address for emeta, in case it has
> +	 * shifted due to write errors
> +	 */
> +	if (line->emeta_ssec != line->cur_sec)
> +		line->emeta_ssec = line->cur_sec;
> +
> 	list_add_tail(&line->list, &l_mg->emeta_list);
> 	spin_unlock(&line->lock);
> 	spin_unlock(&l_mg->close_lock);
> 
> 	pblk_line_should_sync_meta(pblk);
> +
> +
> +}
> +
> +static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
> +{
> +	struct pblk_line_meta *lm = &pblk->lm;
> +	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;
> +
> +	w_err_gc->lba_list = kmalloc(lba_list_size, GFP_KERNEL);
> +	memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf),
> +				lba_list_size);
> }
> 
> void pblk_line_close_ws(struct work_struct *work)
> @@ -1780,6 +1812,13 @@ void pblk_line_close_ws(struct work_struct *work)
> 									ws);
> 	struct pblk *pblk = line_ws->pblk;
> 	struct pblk_line *line = line_ws->line;
> +	struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
> +
> +	/* Write errors makes the emeta start address stored in smeta invalid,
> +	 * so keep a copy of the lba list until we've gc'd the line
> +	 */
> +	if (w_err_gc->has_write_err)
> +		pblk_save_lba_list(pblk, line);
> 
> 	pblk_line_close(pblk, line);
> 	mempool_free(line_ws, pblk->gen_ws_pool);
> diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c
> index b0cc277..62f0548 100644
> --- a/drivers/lightnvm/pblk-gc.c
> +++ b/drivers/lightnvm/pblk-gc.c
> @@ -138,10 +138,10 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> 	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
> 	struct pblk_line_meta *lm = &pblk->lm;
> 	struct pblk_gc *gc = &pblk->gc;
> -	struct line_emeta *emeta_buf;
> +	struct line_emeta *emeta_buf = NULL;
> 	struct pblk_line_ws *gc_rq_ws;
> 	struct pblk_gc_rq *gc_rq;
> -	__le64 *lba_list;
> +	__le64 *lba_list = NULL;
> 	unsigned long *invalid_bitmap;
> 	int sec_left, nr_secs, bit;
> 	int ret;
> @@ -150,34 +150,42 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> 	if (!invalid_bitmap)
> 		goto fail_free_ws;
> 
> -	emeta_buf = pblk_malloc(lm->emeta_len[0], l_mg->emeta_alloc_type,
> -								GFP_KERNEL);
> -	if (!emeta_buf) {
> -		pr_err("pblk: cannot use GC emeta\n");
> -		goto fail_free_bitmap;
> -	}
> -
> -	ret = pblk_line_read_emeta(pblk, line, emeta_buf);
> -	if (ret) {
> -		pr_err("pblk: line %d read emeta failed (%d)\n", line->id, ret);
> -		goto fail_free_emeta;
> -	}
> +	if (line->w_err_gc->has_write_err) {
> +		lba_list = line->w_err_gc->lba_list;
> +	} else {
> +		emeta_buf = pblk_malloc(lm->emeta_len[0],
> +				l_mg->emeta_alloc_type, GFP_KERNEL);
> +		if (!emeta_buf) {
> +			pr_err("pblk: cannot use GC emeta\n");
> +			goto fail_free_bitmap;
> +		}
> 
> -	/* If this read fails, it means that emeta is corrupted. For now, leave
> -	 * the line untouched. TODO: Implement a recovery routine that scans and
> -	 * moves all sectors on the line.
> -	 */
> +		ret = pblk_line_read_emeta(pblk, line, emeta_buf);
> +		if (ret) {
> +			pr_err("pblk: line %d read emeta failed (%d)\n",
> +					line->id, ret);
> +			goto fail_free_emeta;
> +		}
> 
> -	ret = pblk_recov_check_emeta(pblk, emeta_buf);
> -	if (ret) {
> -		pr_err("pblk: inconsistent emeta (line %d)\n", line->id);
> -		goto fail_free_emeta;
> -	}
> +		/* If this read fails, it means that emeta is corrupted.
> +		 * For now, leave the line untouched.
> +		 * TODO: Implement a recovery routine that scans and moves
> +		 * all sectors on the line.
> +		 */
> +
> +		ret = pblk_recov_check_emeta(pblk, emeta_buf);
> +		if (ret) {
> +			pr_err("pblk: inconsistent emeta (line %d)\n",
> +					line->id);
> +			goto fail_free_emeta;
> +		}
> 
> -	lba_list = emeta_to_lbas(pblk, emeta_buf);
> -	if (!lba_list) {
> -		pr_err("pblk: could not interpret emeta (line %d)\n", line->id);
> -		goto fail_free_emeta;
> +		lba_list = emeta_to_lbas(pblk, emeta_buf);
> +		if (!lba_list) {
> +			pr_err("pblk: could not interpret emeta (line %d)\n",
> +					line->id);
> +			goto fail_free_emeta;
> +		}
> 	}


would it be an idea to make move all the logic above to a different
function returning lba_list? This way, we do not have an extra indent
for a single line use case.

> 
> 	spin_lock(&line->lock);
> @@ -240,7 +248,12 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> 		goto next_rq;
> 
> out:
> -	pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
> +	if (line->w_err_gc->has_write_err) {
> +		kfree(lba_list);
> +		line->w_err_gc->lba_list = NULL;
> +	} else
> +		pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
> +
> 	kfree(line_ws);
> 	kfree(invalid_bitmap);
> 
> @@ -252,7 +265,11 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
> fail_free_gc_rq:
> 	kfree(gc_rq);
> fail_free_emeta:
> -	pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
> +	if (line->w_err_gc->has_write_err) {
> +		kfree(lba_list);
> +		line->w_err_gc->lba_list = NULL;
> +	} else
> +		pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);

Can you open/close brackets here too?

> fail_free_bitmap:
> 	kfree(invalid_bitmap);
> fail_free_ws:
> @@ -349,12 +366,14 @@ static struct pblk_line *pblk_gc_get_victim_line(struct pblk *pblk,
> static bool pblk_gc_should_run(struct pblk_gc *gc, struct pblk_rl *rl)
> {
> 	unsigned int nr_blocks_free, nr_blocks_need;
> +	unsigned int werr_lines = atomic_read(&rl->werr_lines);
> 
> 	nr_blocks_need = pblk_rl_high_thrs(rl);
> 	nr_blocks_free = pblk_rl_nr_free_blks(rl);
> 
> 	/* This is not critical, no need to take lock here */
> -	return ((gc->gc_active) && (nr_blocks_need > nr_blocks_free));
> +	return ((werr_lines > 0) ||
> +		((gc->gc_active) && (nr_blocks_need > nr_blocks_free)));
> }
> 
> void pblk_gc_free_full_lines(struct pblk *pblk)
> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
> index 6f06727..092e361 100644
> --- a/drivers/lightnvm/pblk-init.c
> +++ b/drivers/lightnvm/pblk-init.c
> @@ -495,9 +495,14 @@ static void pblk_line_mg_free(struct pblk *pblk)
> 
> static void pblk_line_meta_free(struct pblk_line *line)
> {
> +	struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
> +
> 	kfree(line->blk_bitmap);
> 	kfree(line->erase_bitmap);
> 	kfree(line->chks);
> +
> +	kfree(w_err_gc->lba_list);
> +	kfree(w_err_gc);
> }
> 
> static void pblk_lines_free(struct pblk *pblk)
> @@ -813,20 +818,28 @@ static int pblk_alloc_line_meta(struct pblk *pblk, struct pblk_line *line)
> 		return -ENOMEM;
> 
> 	line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL);
> -	if (!line->erase_bitmap) {
> -		kfree(line->blk_bitmap);
> -		return -ENOMEM;
> -	}
> +	if (!line->erase_bitmap)
> +		goto free_blk_bitmap;
> +
> 
> 	line->chks = kmalloc(lm->blk_per_line * sizeof(struct nvm_chk_meta),
> 								GFP_KERNEL);
> -	if (!line->chks) {
> -		kfree(line->erase_bitmap);
> -		kfree(line->blk_bitmap);
> -		return -ENOMEM;
> -	}
> +	if (!line->chks)
> +		goto free_erase_bitmap;
> +
> +	line->w_err_gc = kzalloc(sizeof(struct pblk_w_err_gc), GFP_KERNEL);
> +	if (!line->w_err_gc)
> +		goto free_chks;
> 
> 	return 0;
> +
> +free_chks:
> +	kfree(line->chks);
> +free_erase_bitmap:
> +	kfree(line->erase_bitmap);
> +free_blk_bitmap:
> +	kfree(line->blk_bitmap);
> +	return -ENOMEM;
> }
> 
> static int pblk_line_mg_init(struct pblk *pblk)
> @@ -851,12 +864,14 @@ static int pblk_line_mg_init(struct pblk *pblk)
> 	INIT_LIST_HEAD(&l_mg->gc_mid_list);
> 	INIT_LIST_HEAD(&l_mg->gc_low_list);
> 	INIT_LIST_HEAD(&l_mg->gc_empty_list);
> +	INIT_LIST_HEAD(&l_mg->gc_werr_list);
> 
> 	INIT_LIST_HEAD(&l_mg->emeta_list);
> 
> -	l_mg->gc_lists[0] = &l_mg->gc_high_list;
> -	l_mg->gc_lists[1] = &l_mg->gc_mid_list;
> -	l_mg->gc_lists[2] = &l_mg->gc_low_list;
> +	l_mg->gc_lists[0] = &l_mg->gc_werr_list;
> +	l_mg->gc_lists[1] = &l_mg->gc_high_list;
> +	l_mg->gc_lists[2] = &l_mg->gc_mid_list;
> +	l_mg->gc_lists[3] = &l_mg->gc_low_list;
> 
> 	spin_lock_init(&l_mg->free_lock);
> 	spin_lock_init(&l_mg->close_lock);
> diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c
> index 883a711..6a0616a 100644
> --- a/drivers/lightnvm/pblk-rl.c
> +++ b/drivers/lightnvm/pblk-rl.c
> @@ -73,6 +73,16 @@ void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries)
> 	pblk_rl_kick_u_timer(rl);
> }
> 
> +void pblk_rl_werr_line_in(struct pblk_rl *rl)
> +{
> +	atomic_inc(&rl->werr_lines);
> +}
> +
> +void pblk_rl_werr_line_out(struct pblk_rl *rl)
> +{
> +	atomic_dec(&rl->werr_lines);
> +}
> +
> void pblk_rl_gc_in(struct pblk_rl *rl, int nr_entries)
> {
> 	atomic_add(nr_entries, &rl->rb_gc_cnt);
> @@ -99,11 +109,21 @@ static void __pblk_rl_update_rates(struct pblk_rl *rl,
> {
> 	struct pblk *pblk = container_of(rl, struct pblk, rl);
> 	int max = rl->rb_budget;
> +	int werr_gc_needed = atomic_read(&rl->werr_lines);
> 
> 	if (free_blocks >= rl->high) {
> -		rl->rb_user_max = max;
> -		rl->rb_gc_max = 0;
> -		rl->rb_state = PBLK_RL_HIGH;
> +		if (werr_gc_needed) {
> +			/* Allocate a small budget for recovering
> +			 * lines with write errors
> +			 */
> +			rl->rb_gc_max = 1 << rl->rb_windows_pw;
> +			rl->rb_user_max = max - rl->rb_gc_max;
> +			rl->rb_state = PBLK_RL_WERR;
> +		} else {
> +			rl->rb_user_max = max;
> +			rl->rb_gc_max = 0;
> +			rl->rb_state = PBLK_RL_OFF;
> +		}
> 	} else if (free_blocks < rl->high) {
> 		int shift = rl->high_pw - rl->rb_windows_pw;
> 		int user_windows = free_blocks >> shift;
> @@ -124,7 +144,7 @@ static void __pblk_rl_update_rates(struct pblk_rl *rl,
> 		rl->rb_state = PBLK_RL_LOW;
> 	}
> 
> -	if (rl->rb_state == (PBLK_RL_MID | PBLK_RL_LOW))
> +	if (rl->rb_state != PBLK_RL_OFF)
> 		pblk_gc_should_start(pblk);
> 	else
> 		pblk_gc_should_stop(pblk);
> @@ -221,6 +241,7 @@ void pblk_rl_init(struct pblk_rl *rl, int budget)
> 	atomic_set(&rl->rb_user_cnt, 0);
> 	atomic_set(&rl->rb_gc_cnt, 0);
> 	atomic_set(&rl->rb_space, -1);
> +	atomic_set(&rl->werr_lines, 0);
> 
> 	timer_setup(&rl->u_timer, pblk_rl_u_timer, 0);
> 
> diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c
> index e61909a..88a0a7c 100644
> --- a/drivers/lightnvm/pblk-sysfs.c
> +++ b/drivers/lightnvm/pblk-sysfs.c
> @@ -173,6 +173,8 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
> 	int free_line_cnt = 0, closed_line_cnt = 0, emeta_line_cnt = 0;
> 	int d_line_cnt = 0, l_line_cnt = 0;
> 	int gc_full = 0, gc_high = 0, gc_mid = 0, gc_low = 0, gc_empty = 0;
> +	int gc_werr = 0;
> +
> 	int bad = 0, cor = 0;
> 	int msecs = 0, cur_sec = 0, vsc = 0, sec_in_line = 0;
> 	int map_weight = 0, meta_weight = 0;
> @@ -237,6 +239,15 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
> 		gc_empty++;
> 	}
> 
> +	list_for_each_entry(line, &l_mg->gc_werr_list, list) {
> +		if (line->type == PBLK_LINETYPE_DATA)
> +			d_line_cnt++;
> +		else if (line->type == PBLK_LINETYPE_LOG)
> +			l_line_cnt++;
> +		closed_line_cnt++;
> +		gc_werr++;
> +	}
> +
> 	list_for_each_entry(line, &l_mg->bad_list, list)
> 		bad++;
> 	list_for_each_entry(line, &l_mg->corrupt_list, list)
> @@ -275,8 +286,8 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
> 					l_mg->nr_lines);
> 
> 	sz += snprintf(page + sz, PAGE_SIZE - sz,
> -		"GC: full:%d, high:%d, mid:%d, low:%d, empty:%d, queue:%d\n",
> -			gc_full, gc_high, gc_mid, gc_low, gc_empty,
> +		"GC: full:%d, high:%d, mid:%d, low:%d, empty:%d, werr: %d, queue:%d\n",
> +			gc_full, gc_high, gc_mid, gc_low, gc_empty, gc_werr,
> 			atomic_read(&pblk->gc.read_inflight_gc));
> 
> 	sz += snprintf(page + sz, PAGE_SIZE - sz,
> diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
> index ab45157..3b6bead 100644
> --- a/drivers/lightnvm/pblk-write.c
> +++ b/drivers/lightnvm/pblk-write.c
> @@ -136,6 +136,7 @@ static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa)
> 		}
> 	}
> 
> +	line->w_err_gc->has_write_err = 1;
> 	spin_unlock(&line->lock);
> }
> 
> @@ -277,6 +278,7 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
> 	if (rqd->error) {
> 		pblk_log_write_err(pblk, rqd);
> 		pr_err("pblk: metadata I/O failed. Line %d\n", line->id);
> +		line->w_err_gc->has_write_err = 1;
> 	}
> 
> 	sync = atomic_add_return(rqd->nr_ppas, &emeta->sync);
> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> index cff6aea..a4e55d8 100644
> --- a/drivers/lightnvm/pblk.h
> +++ b/drivers/lightnvm/pblk.h
> @@ -89,12 +89,14 @@ struct pblk_sec_meta {
> /* The number of GC lists and the rate-limiter states go together. This way the
>  * rate-limiter can dictate how much GC is needed based on resource utilization.
>  */
> -#define PBLK_GC_NR_LISTS 3
> +#define PBLK_GC_NR_LISTS 4
> 
> enum {
> -	PBLK_RL_HIGH = 1,
> -	PBLK_RL_MID = 2,
> -	PBLK_RL_LOW = 3,
> +	PBLK_RL_OFF = 0,
> +	PBLK_RL_WERR = 1,
> +	PBLK_RL_HIGH = 2,
> +	PBLK_RL_MID = 3,
> +	PBLK_RL_LOW = 4
> };
> 
> #define pblk_dma_meta_size (sizeof(struct pblk_sec_meta) * PBLK_MAX_REQ_ADDRS)
> @@ -278,6 +280,8 @@ struct pblk_rl {
> 	int rb_user_active;
> 	int rb_gc_active;
> 
> +	atomic_t werr_lines;	/* Number of write error lines that needs gc */
> +
> 	struct timer_list u_timer;
> 
> 	unsigned long long nr_secs;
> @@ -311,6 +315,7 @@ enum {
> 	PBLK_LINEGC_MID = 23,
> 	PBLK_LINEGC_HIGH = 24,
> 	PBLK_LINEGC_FULL = 25,
> +	PBLK_LINEGC_WERR = 26
> };
> 
> #define PBLK_MAGIC 0x70626c6b /*pblk*/
> @@ -412,6 +417,11 @@ struct pblk_smeta {
> 	struct line_smeta *buf;		/* smeta buffer in persistent format */
> };
> 
> +struct pblk_w_err_gc {
> +	int has_write_err;
> +	__le64 *lba_list;
> +};
> +
> struct pblk_line {
> 	struct pblk *pblk;
> 	unsigned int id;		/* Line number corresponds to the
> @@ -457,6 +467,8 @@ struct pblk_line {
> 
> 	struct kref ref;		/* Write buffer L2P references */
> 
> +	struct pblk_w_err_gc *w_err_gc;	/* Write error gc recovery metadata */
> +
> 	spinlock_t lock;		/* Necessary for invalid_bitmap only */
> };
> 
> @@ -488,6 +500,8 @@ struct pblk_line_mgmt {
> 	struct list_head gc_mid_list;	/* Full lines ready to GC, mid isc */
> 	struct list_head gc_low_list;	/* Full lines ready to GC, low isc */
> 
> +	struct list_head gc_werr_list;  /* Write err recovery list */
> +
> 	struct list_head gc_full_list;	/* Full lines ready to GC, no valid */
> 	struct list_head gc_empty_list;	/* Full lines close, all valid */
> 
> @@ -894,6 +908,9 @@ void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line,
> 			    bool used);
> int pblk_rl_is_limit(struct pblk_rl *rl);
> 
> +void pblk_rl_werr_line_in(struct pblk_rl *rl);
> +void pblk_rl_werr_line_out(struct pblk_rl *rl);
> +
> /*
>  * pblk sysfs
>  */
> --
> 2.7.4

Otherwise, it looks good to me

Javier

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