lightnvm: pblk: remove debug from pblk_[down/up]_page

Remove the debug only iteration within __pblk_down_page, which
then allows us to reduce the number of arguments down to pblk and
the parallel unit from the functions that calls it. Simplifying the
callers logic considerably.

Also, rename the functions pblk_[down/up]_page to
pblk_[down/up]_chunk, to communicate that it manages the write
pointer of the chunk. Note that it also protects the parallel unit
such that at most one chunk is active per parallel unit.

Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-core.c

@@ -1861,8 +1861,7 @@ void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
 	queue_work(wq, &line_ws->ws);
 }
 
-static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
-			     int nr_ppas, int pos)
+static void __pblk_down_chunk(struct pblk *pblk, int pos)
 {
 	struct pblk_lun *rlun = &pblk->luns[pos];
 	int ret;
@@ -1871,13 +1870,6 @@ static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
 	 * Only send one inflight I/O per LUN. Since we map at a page
 	 * granurality, all ppas in the I/O will map to the same LUN
 	 */
-#ifdef CONFIG_NVM_PBLK_DEBUG
-	int i;
-
-	for (i = 1; i < nr_ppas; i++)
-		WARN_ON(ppa_list[0].a.lun != ppa_list[i].a.lun ||
-				ppa_list[0].a.ch != ppa_list[i].a.ch);
-#endif
 
 	ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
 	if (ret == -ETIME || ret == -EINTR)
@@ -1885,21 +1877,21 @@ static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list,
 				-ret);
 }
 
-void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
+void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa)
 {
 	struct nvm_tgt_dev *dev = pblk->dev;
 	struct nvm_geo *geo = &dev->geo;
-	int pos = pblk_ppa_to_pos(geo, ppa_list[0]);
+	int pos = pblk_ppa_to_pos(geo, ppa);
 
-	__pblk_down_page(pblk, ppa_list, nr_ppas, pos);
+	__pblk_down_chunk(pblk, pos);
 }
 
-void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
+void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa,
 		  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]);
+	int pos = pblk_ppa_to_pos(geo, ppa);
 
 	/* If the LUN has been locked for this same request, do no attempt to
 	 * lock it again
@@ -1907,23 +1899,15 @@ void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
 	if (test_and_set_bit(pos, lun_bitmap))
 		return;
 
-	__pblk_down_page(pblk, ppa_list, nr_ppas, pos);
+	__pblk_down_chunk(pblk, pos);
 }
 
-void pblk_up_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas)
+void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa)
 {
 	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_PBLK_DEBUG
-	int i;
-
-	for (i = 1; i < nr_ppas; i++)
-		WARN_ON(ppa_list[0].a.lun != ppa_list[i].a.lun ||
-				ppa_list[0].a.ch != ppa_list[i].a.ch);
-#endif
+	int pos = pblk_ppa_to_pos(geo, ppa);
 
 	rlun = &pblk->luns[pos];
 	up(&rlun->wr_sem);