ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/md/dm-stripe.c b/marvell/linux/drivers/md/dm-stripe.c
new file mode 100644
index 0000000..8547d75
--- /dev/null
+++ b/marvell/linux/drivers/md/dm-stripe.c
@@ -0,0 +1,518 @@
+/*
+ * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
+ *
+ * This file is released under the GPL.
+ */
+
+#include "dm.h"
+#include <linux/device-mapper.h>
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/bio.h>
+#include <linux/dax.h>
+#include <linux/slab.h>
+#include <linux/log2.h>
+
+#define DM_MSG_PREFIX "striped"
+#define DM_IO_ERROR_THRESHOLD 15
+
+struct stripe {
+ struct dm_dev *dev;
+ sector_t physical_start;
+
+ atomic_t error_count;
+};
+
+struct stripe_c {
+ uint32_t stripes;
+ int stripes_shift;
+
+ /* The size of this target / num. stripes */
+ sector_t stripe_width;
+
+ uint32_t chunk_size;
+ int chunk_size_shift;
+
+ /* Needed for handling events */
+ struct dm_target *ti;
+
+ /* Work struct used for triggering events*/
+ struct work_struct trigger_event;
+
+ struct stripe stripe[0];
+};
+
+/*
+ * An event is triggered whenever a drive
+ * drops out of a stripe volume.
+ */
+static void trigger_event(struct work_struct *work)
+{
+ struct stripe_c *sc = container_of(work, struct stripe_c,
+ trigger_event);
+ dm_table_event(sc->ti->table);
+}
+
+static inline struct stripe_c *alloc_context(unsigned int stripes)
+{
+ size_t len;
+
+ if (dm_array_too_big(sizeof(struct stripe_c), sizeof(struct stripe),
+ stripes))
+ return NULL;
+
+ len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes);
+
+ return kmalloc(len, GFP_KERNEL);
+}
+
+/*
+ * Parse a single <dev> <sector> pair
+ */
+static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
+ unsigned int stripe, char **argv)
+{
+ unsigned long long start;
+ char dummy;
+ int ret;
+
+ if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1)
+ return -EINVAL;
+
+ ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
+ &sc->stripe[stripe].dev);
+ if (ret)
+ return ret;
+
+ sc->stripe[stripe].physical_start = start;
+
+ return 0;
+}
+
+/*
+ * Construct a striped mapping.
+ * <number of stripes> <chunk size> [<dev_path> <offset>]+
+ */
+static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
+{
+ struct stripe_c *sc;
+ sector_t width, tmp_len;
+ uint32_t stripes;
+ uint32_t chunk_size;
+ int r;
+ unsigned int i;
+
+ if (argc < 2) {
+ ti->error = "Not enough arguments";
+ return -EINVAL;
+ }
+
+ if (kstrtouint(argv[0], 10, &stripes) || !stripes) {
+ ti->error = "Invalid stripe count";
+ return -EINVAL;
+ }
+
+ if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) {
+ ti->error = "Invalid chunk_size";
+ return -EINVAL;
+ }
+
+ width = ti->len;
+ if (sector_div(width, stripes)) {
+ ti->error = "Target length not divisible by "
+ "number of stripes";
+ return -EINVAL;
+ }
+
+ tmp_len = width;
+ if (sector_div(tmp_len, chunk_size)) {
+ ti->error = "Target length not divisible by "
+ "chunk size";
+ return -EINVAL;
+ }
+
+ /*
+ * Do we have enough arguments for that many stripes ?
+ */
+ if (argc != (2 + 2 * stripes)) {
+ ti->error = "Not enough destinations "
+ "specified";
+ return -EINVAL;
+ }
+
+ sc = alloc_context(stripes);
+ if (!sc) {
+ ti->error = "Memory allocation for striped context "
+ "failed";
+ return -ENOMEM;
+ }
+
+ INIT_WORK(&sc->trigger_event, trigger_event);
+
+ /* Set pointer to dm target; used in trigger_event */
+ sc->ti = ti;
+ sc->stripes = stripes;
+ sc->stripe_width = width;
+
+ if (stripes & (stripes - 1))
+ sc->stripes_shift = -1;
+ else
+ sc->stripes_shift = __ffs(stripes);
+
+ r = dm_set_target_max_io_len(ti, chunk_size);
+ if (r) {
+ kfree(sc);
+ return r;
+ }
+
+ ti->num_flush_bios = stripes;
+ ti->num_discard_bios = stripes;
+ ti->num_secure_erase_bios = stripes;
+ ti->num_write_same_bios = stripes;
+ ti->num_write_zeroes_bios = stripes;
+
+ sc->chunk_size = chunk_size;
+ if (chunk_size & (chunk_size - 1))
+ sc->chunk_size_shift = -1;
+ else
+ sc->chunk_size_shift = __ffs(chunk_size);
+
+ /*
+ * Get the stripe destinations.
+ */
+ for (i = 0; i < stripes; i++) {
+ argv += 2;
+
+ r = get_stripe(ti, sc, i, argv);
+ if (r < 0) {
+ ti->error = "Couldn't parse stripe destination";
+ while (i--)
+ dm_put_device(ti, sc->stripe[i].dev);
+ kfree(sc);
+ return r;
+ }
+ atomic_set(&(sc->stripe[i].error_count), 0);
+ }
+
+ ti->private = sc;
+
+ return 0;
+}
+
+static void stripe_dtr(struct dm_target *ti)
+{
+ unsigned int i;
+ struct stripe_c *sc = (struct stripe_c *) ti->private;
+
+ for (i = 0; i < sc->stripes; i++)
+ dm_put_device(ti, sc->stripe[i].dev);
+
+ flush_work(&sc->trigger_event);
+ kfree(sc);
+}
+
+static void stripe_map_sector(struct stripe_c *sc, sector_t sector,
+ uint32_t *stripe, sector_t *result)
+{
+ sector_t chunk = dm_target_offset(sc->ti, sector);
+ sector_t chunk_offset;
+
+ if (sc->chunk_size_shift < 0)
+ chunk_offset = sector_div(chunk, sc->chunk_size);
+ else {
+ chunk_offset = chunk & (sc->chunk_size - 1);
+ chunk >>= sc->chunk_size_shift;
+ }
+
+ if (sc->stripes_shift < 0)
+ *stripe = sector_div(chunk, sc->stripes);
+ else {
+ *stripe = chunk & (sc->stripes - 1);
+ chunk >>= sc->stripes_shift;
+ }
+
+ if (sc->chunk_size_shift < 0)
+ chunk *= sc->chunk_size;
+ else
+ chunk <<= sc->chunk_size_shift;
+
+ *result = chunk + chunk_offset;
+}
+
+static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector,
+ uint32_t target_stripe, sector_t *result)
+{
+ uint32_t stripe;
+
+ stripe_map_sector(sc, sector, &stripe, result);
+ if (stripe == target_stripe)
+ return;
+
+ /* round down */
+ sector = *result;
+ if (sc->chunk_size_shift < 0)
+ *result -= sector_div(sector, sc->chunk_size);
+ else
+ *result = sector & ~(sector_t)(sc->chunk_size - 1);
+
+ if (target_stripe < stripe)
+ *result += sc->chunk_size; /* next chunk */
+}
+
+static int stripe_map_range(struct stripe_c *sc, struct bio *bio,
+ uint32_t target_stripe)
+{
+ sector_t begin, end;
+
+ stripe_map_range_sector(sc, bio->bi_iter.bi_sector,
+ target_stripe, &begin);
+ stripe_map_range_sector(sc, bio_end_sector(bio),
+ target_stripe, &end);
+ if (begin < end) {
+ bio_set_dev(bio, sc->stripe[target_stripe].dev->bdev);
+ bio->bi_iter.bi_sector = begin +
+ sc->stripe[target_stripe].physical_start;
+ bio->bi_iter.bi_size = to_bytes(end - begin);
+ return DM_MAPIO_REMAPPED;
+ } else {
+ /* The range doesn't map to the target stripe */
+ bio_endio(bio);
+ return DM_MAPIO_SUBMITTED;
+ }
+}
+
+static int stripe_map(struct dm_target *ti, struct bio *bio)
+{
+ struct stripe_c *sc = ti->private;
+ uint32_t stripe;
+ unsigned target_bio_nr;
+
+ if (bio->bi_opf & REQ_PREFLUSH) {
+ target_bio_nr = dm_bio_get_target_bio_nr(bio);
+ BUG_ON(target_bio_nr >= sc->stripes);
+ bio_set_dev(bio, sc->stripe[target_bio_nr].dev->bdev);
+ return DM_MAPIO_REMAPPED;
+ }
+ if (unlikely(bio_op(bio) == REQ_OP_DISCARD) ||
+ unlikely(bio_op(bio) == REQ_OP_SECURE_ERASE) ||
+ unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES) ||
+ unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) {
+ target_bio_nr = dm_bio_get_target_bio_nr(bio);
+ BUG_ON(target_bio_nr >= sc->stripes);
+ return stripe_map_range(sc, bio, target_bio_nr);
+ }
+
+ stripe_map_sector(sc, bio->bi_iter.bi_sector,
+ &stripe, &bio->bi_iter.bi_sector);
+
+ bio->bi_iter.bi_sector += sc->stripe[stripe].physical_start;
+ bio_set_dev(bio, sc->stripe[stripe].dev->bdev);
+
+ return DM_MAPIO_REMAPPED;
+}
+
+#if IS_ENABLED(CONFIG_DAX_DRIVER)
+static long stripe_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
+ long nr_pages, void **kaddr, pfn_t *pfn)
+{
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+ struct stripe_c *sc = ti->private;
+ struct dax_device *dax_dev;
+ struct block_device *bdev;
+ uint32_t stripe;
+ long ret;
+
+ stripe_map_sector(sc, sector, &stripe, &dev_sector);
+ dev_sector += sc->stripe[stripe].physical_start;
+ dax_dev = sc->stripe[stripe].dev->dax_dev;
+ bdev = sc->stripe[stripe].dev->bdev;
+
+ ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff);
+ if (ret)
+ return ret;
+ return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn);
+}
+
+static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+ struct stripe_c *sc = ti->private;
+ struct dax_device *dax_dev;
+ struct block_device *bdev;
+ uint32_t stripe;
+
+ stripe_map_sector(sc, sector, &stripe, &dev_sector);
+ dev_sector += sc->stripe[stripe].physical_start;
+ dax_dev = sc->stripe[stripe].dev->dax_dev;
+ bdev = sc->stripe[stripe].dev->bdev;
+
+ if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
+ return 0;
+ return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i);
+}
+
+static size_t stripe_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff,
+ void *addr, size_t bytes, struct iov_iter *i)
+{
+ sector_t dev_sector, sector = pgoff * PAGE_SECTORS;
+ struct stripe_c *sc = ti->private;
+ struct dax_device *dax_dev;
+ struct block_device *bdev;
+ uint32_t stripe;
+
+ stripe_map_sector(sc, sector, &stripe, &dev_sector);
+ dev_sector += sc->stripe[stripe].physical_start;
+ dax_dev = sc->stripe[stripe].dev->dax_dev;
+ bdev = sc->stripe[stripe].dev->bdev;
+
+ if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff))
+ return 0;
+ return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i);
+}
+
+#else
+#define stripe_dax_direct_access NULL
+#define stripe_dax_copy_from_iter NULL
+#define stripe_dax_copy_to_iter NULL
+#endif
+
+/*
+ * Stripe status:
+ *
+ * INFO
+ * #stripes [stripe_name <stripe_name>] [group word count]
+ * [error count 'A|D' <error count 'A|D'>]
+ *
+ * TABLE
+ * #stripes [stripe chunk size]
+ * [stripe_name physical_start <stripe_name physical_start>]
+ *
+ */
+
+static void stripe_status(struct dm_target *ti, status_type_t type,
+ unsigned status_flags, char *result, unsigned maxlen)
+{
+ struct stripe_c *sc = (struct stripe_c *) ti->private;
+ unsigned int sz = 0;
+ unsigned int i;
+
+ switch (type) {
+ case STATUSTYPE_INFO:
+ DMEMIT("%d ", sc->stripes);
+ for (i = 0; i < sc->stripes; i++) {
+ DMEMIT("%s ", sc->stripe[i].dev->name);
+ }
+ DMEMIT("1 ");
+ for (i = 0; i < sc->stripes; i++) {
+ DMEMIT("%c", atomic_read(&(sc->stripe[i].error_count)) ?
+ 'D' : 'A');
+ }
+ break;
+
+ case STATUSTYPE_TABLE:
+ DMEMIT("%d %llu", sc->stripes,
+ (unsigned long long)sc->chunk_size);
+ for (i = 0; i < sc->stripes; i++)
+ DMEMIT(" %s %llu", sc->stripe[i].dev->name,
+ (unsigned long long)sc->stripe[i].physical_start);
+ break;
+ }
+}
+
+static int stripe_end_io(struct dm_target *ti, struct bio *bio,
+ blk_status_t *error)
+{
+ unsigned i;
+ char major_minor[16];
+ struct stripe_c *sc = ti->private;
+
+ if (!*error)
+ return DM_ENDIO_DONE; /* I/O complete */
+
+ if (bio->bi_opf & REQ_RAHEAD)
+ return DM_ENDIO_DONE;
+
+ if (*error == BLK_STS_NOTSUPP)
+ return DM_ENDIO_DONE;
+
+ memset(major_minor, 0, sizeof(major_minor));
+ sprintf(major_minor, "%d:%d", MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)));
+
+ /*
+ * Test to see which stripe drive triggered the event
+ * and increment error count for all stripes on that device.
+ * If the error count for a given device exceeds the threshold
+ * value we will no longer trigger any further events.
+ */
+ for (i = 0; i < sc->stripes; i++)
+ if (!strcmp(sc->stripe[i].dev->name, major_minor)) {
+ atomic_inc(&(sc->stripe[i].error_count));
+ if (atomic_read(&(sc->stripe[i].error_count)) <
+ DM_IO_ERROR_THRESHOLD)
+ schedule_work(&sc->trigger_event);
+ }
+
+ return DM_ENDIO_DONE;
+}
+
+static int stripe_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct stripe_c *sc = ti->private;
+ int ret = 0;
+ unsigned i = 0;
+
+ do {
+ ret = fn(ti, sc->stripe[i].dev,
+ sc->stripe[i].physical_start,
+ sc->stripe_width, data);
+ } while (!ret && ++i < sc->stripes);
+
+ return ret;
+}
+
+static void stripe_io_hints(struct dm_target *ti,
+ struct queue_limits *limits)
+{
+ struct stripe_c *sc = ti->private;
+ unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT;
+
+ blk_limits_io_min(limits, chunk_size);
+ blk_limits_io_opt(limits, chunk_size * sc->stripes);
+}
+
+static struct target_type stripe_target = {
+ .name = "striped",
+ .version = {1, 6, 0},
+ .features = DM_TARGET_PASSES_INTEGRITY,
+ .module = THIS_MODULE,
+ .ctr = stripe_ctr,
+ .dtr = stripe_dtr,
+ .map = stripe_map,
+ .end_io = stripe_end_io,
+ .status = stripe_status,
+ .iterate_devices = stripe_iterate_devices,
+ .io_hints = stripe_io_hints,
+ .direct_access = stripe_dax_direct_access,
+ .dax_copy_from_iter = stripe_dax_copy_from_iter,
+ .dax_copy_to_iter = stripe_dax_copy_to_iter,
+};
+
+int __init dm_stripe_init(void)
+{
+ int r;
+
+ r = dm_register_target(&stripe_target);
+ if (r < 0)
+ DMWARN("target registration failed");
+
+ return r;
+}
+
+void dm_stripe_exit(void)
+{
+ dm_unregister_target(&stripe_target);
+}