v4.19.13 snapshot.
diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c
new file mode 100644
index 0000000..6a0616a
--- /dev/null
+++ b/drivers/lightnvm/pblk-rl.c
@@ -0,0 +1,250 @@
+/*
+ * Copyright (C) 2016 CNEX Labs
+ * Initial release: Javier Gonzalez <javier@cnexlabs.com>
+ * Matias Bjorling <matias@cnexlabs.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * pblk-rl.c - pblk's rate limiter for user I/O
+ *
+ */
+
+#include "pblk.h"
+
+static void pblk_rl_kick_u_timer(struct pblk_rl *rl)
+{
+ mod_timer(&rl->u_timer, jiffies + msecs_to_jiffies(5000));
+}
+
+int pblk_rl_is_limit(struct pblk_rl *rl)
+{
+ int rb_space;
+
+ rb_space = atomic_read(&rl->rb_space);
+
+ return (rb_space == 0);
+}
+
+int pblk_rl_user_may_insert(struct pblk_rl *rl, int nr_entries)
+{
+ int rb_user_cnt = atomic_read(&rl->rb_user_cnt);
+ int rb_space = atomic_read(&rl->rb_space);
+
+ if (unlikely(rb_space >= 0) && (rb_space - nr_entries < 0))
+ return NVM_IO_ERR;
+
+ if (rb_user_cnt >= rl->rb_user_max)
+ return NVM_IO_REQUEUE;
+
+ return NVM_IO_OK;
+}
+
+void pblk_rl_inserted(struct pblk_rl *rl, int nr_entries)
+{
+ int rb_space = atomic_read(&rl->rb_space);
+
+ if (unlikely(rb_space >= 0))
+ atomic_sub(nr_entries, &rl->rb_space);
+}
+
+int pblk_rl_gc_may_insert(struct pblk_rl *rl, int nr_entries)
+{
+ int rb_gc_cnt = atomic_read(&rl->rb_gc_cnt);
+ int rb_user_active;
+
+ /* If there is no user I/O let GC take over space on the write buffer */
+ rb_user_active = READ_ONCE(rl->rb_user_active);
+ return (!(rb_gc_cnt >= rl->rb_gc_max && rb_user_active));
+}
+
+void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries)
+{
+ atomic_add(nr_entries, &rl->rb_user_cnt);
+
+ /* Release user I/O state. Protect from GC */
+ smp_store_release(&rl->rb_user_active, 1);
+ 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);
+}
+
+void pblk_rl_out(struct pblk_rl *rl, int nr_user, int nr_gc)
+{
+ atomic_sub(nr_user, &rl->rb_user_cnt);
+ atomic_sub(nr_gc, &rl->rb_gc_cnt);
+}
+
+unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl)
+{
+ return atomic_read(&rl->free_blocks);
+}
+
+unsigned long pblk_rl_nr_user_free_blks(struct pblk_rl *rl)
+{
+ return atomic_read(&rl->free_user_blocks);
+}
+
+static void __pblk_rl_update_rates(struct pblk_rl *rl,
+ unsigned long free_blocks)
+{
+ 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) {
+ 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;
+ int user_max = user_windows << PBLK_MAX_REQ_ADDRS_PW;
+
+ rl->rb_user_max = user_max;
+ rl->rb_gc_max = max - user_max;
+
+ if (free_blocks <= rl->rsv_blocks) {
+ rl->rb_user_max = 0;
+ rl->rb_gc_max = max;
+ }
+
+ /* In the worst case, we will need to GC lines in the low list
+ * (high valid sector count). If there are lines to GC on high
+ * or mid lists, these will be prioritized
+ */
+ rl->rb_state = PBLK_RL_LOW;
+ }
+
+ if (rl->rb_state != PBLK_RL_OFF)
+ pblk_gc_should_start(pblk);
+ else
+ pblk_gc_should_stop(pblk);
+}
+
+void pblk_rl_update_rates(struct pblk_rl *rl)
+{
+ __pblk_rl_update_rates(rl, pblk_rl_nr_user_free_blks(rl));
+}
+
+void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line)
+{
+ int blk_in_line = atomic_read(&line->blk_in_line);
+ int free_blocks;
+
+ atomic_add(blk_in_line, &rl->free_blocks);
+ free_blocks = atomic_add_return(blk_in_line, &rl->free_user_blocks);
+
+ __pblk_rl_update_rates(rl, free_blocks);
+}
+
+void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line,
+ bool used)
+{
+ int blk_in_line = atomic_read(&line->blk_in_line);
+ int free_blocks;
+
+ atomic_sub(blk_in_line, &rl->free_blocks);
+
+ if (used)
+ free_blocks = atomic_sub_return(blk_in_line,
+ &rl->free_user_blocks);
+ else
+ free_blocks = atomic_read(&rl->free_user_blocks);
+
+ __pblk_rl_update_rates(rl, free_blocks);
+}
+
+int pblk_rl_high_thrs(struct pblk_rl *rl)
+{
+ return rl->high;
+}
+
+int pblk_rl_max_io(struct pblk_rl *rl)
+{
+ return rl->rb_max_io;
+}
+
+static void pblk_rl_u_timer(struct timer_list *t)
+{
+ struct pblk_rl *rl = from_timer(rl, t, u_timer);
+
+ /* Release user I/O state. Protect from GC */
+ smp_store_release(&rl->rb_user_active, 0);
+}
+
+void pblk_rl_free(struct pblk_rl *rl)
+{
+ del_timer(&rl->u_timer);
+}
+
+void pblk_rl_init(struct pblk_rl *rl, int budget)
+{
+ struct pblk *pblk = container_of(rl, struct pblk, rl);
+ 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;
+ int min_blocks = lm->blk_per_line * PBLK_GC_RSV_LINE;
+ int sec_meta, blk_meta;
+
+ unsigned int rb_windows;
+
+ /* Consider sectors used for metadata */
+ sec_meta = (lm->smeta_sec + lm->emeta_sec[0]) * l_mg->nr_free_lines;
+ blk_meta = DIV_ROUND_UP(sec_meta, geo->clba);
+
+ rl->high = pblk->op_blks - blk_meta - lm->blk_per_line;
+ rl->high_pw = get_count_order(rl->high);
+
+ rl->rsv_blocks = min_blocks;
+
+ /* This will always be a power-of-2 */
+ rb_windows = budget / PBLK_MAX_REQ_ADDRS;
+ rl->rb_windows_pw = get_count_order(rb_windows);
+
+ /* To start with, all buffer is available to user I/O writers */
+ rl->rb_budget = budget;
+ rl->rb_user_max = budget;
+ rl->rb_max_io = budget >> 1;
+ rl->rb_gc_max = 0;
+ rl->rb_state = PBLK_RL_HIGH;
+
+ 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);
+
+ rl->rb_user_active = 0;
+ rl->rb_gc_active = 0;
+}