[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/md/bcache/io.c b/src/kernel/linux/v4.14/drivers/md/bcache/io.c
new file mode 100644
index 0000000..fac97ec
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/md/bcache/io.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Some low level IO code, and hacks for various block layer limitations
+ *
+ * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
+ * Copyright 2012 Google, Inc.
+ */
+
+#include "bcache.h"
+#include "bset.h"
+#include "debug.h"
+
+#include <linux/blkdev.h>
+
+/* Bios with headers */
+
+void bch_bbio_free(struct bio *bio, struct cache_set *c)
+{
+ struct bbio *b = container_of(bio, struct bbio, bio);
+ mempool_free(b, c->bio_meta);
+}
+
+struct bio *bch_bbio_alloc(struct cache_set *c)
+{
+ struct bbio *b = mempool_alloc(c->bio_meta, GFP_NOIO);
+ struct bio *bio = &b->bio;
+
+ bio_init(bio, bio->bi_inline_vecs, bucket_pages(c));
+
+ return bio;
+}
+
+void __bch_submit_bbio(struct bio *bio, struct cache_set *c)
+{
+ struct bbio *b = container_of(bio, struct bbio, bio);
+
+ bio->bi_iter.bi_sector = PTR_OFFSET(&b->key, 0);
+ bio_set_dev(bio, PTR_CACHE(c, &b->key, 0)->bdev);
+
+ b->submit_time_us = local_clock_us();
+ closure_bio_submit(bio, bio->bi_private);
+}
+
+void bch_submit_bbio(struct bio *bio, struct cache_set *c,
+ struct bkey *k, unsigned ptr)
+{
+ struct bbio *b = container_of(bio, struct bbio, bio);
+ bch_bkey_copy_single_ptr(&b->key, k, ptr);
+ __bch_submit_bbio(bio, c);
+}
+
+/* IO errors */
+
+void bch_count_io_errors(struct cache *ca, blk_status_t error, const char *m)
+{
+ /*
+ * The halflife of an error is:
+ * log2(1/2)/log2(127/128) * refresh ~= 88 * refresh
+ */
+
+ if (ca->set->error_decay) {
+ unsigned count = atomic_inc_return(&ca->io_count);
+
+ while (count > ca->set->error_decay) {
+ unsigned errors;
+ unsigned old = count;
+ unsigned new = count - ca->set->error_decay;
+
+ /*
+ * First we subtract refresh from count; each time we
+ * succesfully do so, we rescale the errors once:
+ */
+
+ count = atomic_cmpxchg(&ca->io_count, old, new);
+
+ if (count == old) {
+ count = new;
+
+ errors = atomic_read(&ca->io_errors);
+ do {
+ old = errors;
+ new = ((uint64_t) errors * 127) / 128;
+ errors = atomic_cmpxchg(&ca->io_errors,
+ old, new);
+ } while (old != errors);
+ }
+ }
+ }
+
+ if (error) {
+ char buf[BDEVNAME_SIZE];
+ unsigned errors = atomic_add_return(1 << IO_ERROR_SHIFT,
+ &ca->io_errors);
+ errors >>= IO_ERROR_SHIFT;
+
+ if (errors < ca->set->error_limit)
+ pr_err("%s: IO error on %s, recovering",
+ bdevname(ca->bdev, buf), m);
+ else
+ bch_cache_set_error(ca->set,
+ "%s: too many IO errors %s",
+ bdevname(ca->bdev, buf), m);
+ }
+}
+
+void bch_bbio_count_io_errors(struct cache_set *c, struct bio *bio,
+ blk_status_t error, const char *m)
+{
+ struct bbio *b = container_of(bio, struct bbio, bio);
+ struct cache *ca = PTR_CACHE(c, &b->key, 0);
+
+ unsigned threshold = op_is_write(bio_op(bio))
+ ? c->congested_write_threshold_us
+ : c->congested_read_threshold_us;
+
+ if (threshold) {
+ unsigned t = local_clock_us();
+
+ int us = t - b->submit_time_us;
+ int congested = atomic_read(&c->congested);
+
+ if (us > (int) threshold) {
+ int ms = us / 1024;
+ c->congested_last_us = t;
+
+ ms = min(ms, CONGESTED_MAX + congested);
+ atomic_sub(ms, &c->congested);
+ } else if (congested < 0)
+ atomic_inc(&c->congested);
+ }
+
+ bch_count_io_errors(ca, error, m);
+}
+
+void bch_bbio_endio(struct cache_set *c, struct bio *bio,
+ blk_status_t error, const char *m)
+{
+ struct closure *cl = bio->bi_private;
+
+ bch_bbio_count_io_errors(c, bio, error, m);
+ bio_put(bio);
+ closure_put(cl);
+}