#include "pblk.h"
-void pblk_submit_rec(struct work_struct *work)
-{
- struct pblk_rec_ctx *recovery =
- container_of(work, struct pblk_rec_ctx, ws_rec);
- struct pblk *pblk = recovery->pblk;
- struct nvm_rq *rqd = recovery->rqd;
- struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
- struct bio *bio;
- unsigned int nr_rec_secs;
- unsigned int pgs_read;
- int ret;
-
- nr_rec_secs = bitmap_weight((unsigned long int *)&rqd->ppa_status,
- NVM_MAX_VLBA);
-
- bio = bio_alloc(GFP_KERNEL, nr_rec_secs);
-
- bio->bi_iter.bi_sector = 0;
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- rqd->bio = bio;
- rqd->nr_ppas = nr_rec_secs;
-
- pgs_read = pblk_rb_read_to_bio_list(&pblk->rwb, bio, &recovery->failed,
- nr_rec_secs);
- if (pgs_read != nr_rec_secs) {
- pr_err("pblk: could not read recovery entries\n");
- goto err;
- }
-
- if (pblk_setup_w_rec_rq(pblk, rqd, c_ctx)) {
- pr_err("pblk: could not setup recovery request\n");
- goto err;
- }
-
-#ifdef CONFIG_NVM_DEBUG
- atomic_long_add(nr_rec_secs, &pblk->recov_writes);
-#endif
-
- ret = pblk_submit_io(pblk, rqd);
- if (ret) {
- pr_err("pblk: I/O submission failed: %d\n", ret);
- goto err;
- }
-
- mempool_free(recovery, &pblk->rec_pool);
- return;
-
-err:
- bio_put(bio);
- pblk_free_rqd(pblk, rqd, PBLK_WRITE);
-}
-
-int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx,
- struct pblk_rec_ctx *recovery, u64 *comp_bits,
- unsigned int comp)
-{
- struct nvm_rq *rec_rqd;
- struct pblk_c_ctx *rec_ctx;
- int nr_entries = c_ctx->nr_valid + c_ctx->nr_padded;
-
- rec_rqd = pblk_alloc_rqd(pblk, PBLK_WRITE);
- rec_ctx = nvm_rq_to_pdu(rec_rqd);
-
- /* Copy completion bitmap, but exclude the first X completed entries */
- bitmap_shift_right((unsigned long int *)&rec_rqd->ppa_status,
- (unsigned long int *)comp_bits,
- comp, NVM_MAX_VLBA);
-
- /* Save the context for the entries that need to be re-written and
- * update current context with the completed entries.
- */
- rec_ctx->sentry = pblk_rb_wrap_pos(&pblk->rwb, c_ctx->sentry + comp);
- if (comp >= c_ctx->nr_valid) {
- rec_ctx->nr_valid = 0;
- rec_ctx->nr_padded = nr_entries - comp;
-
- c_ctx->nr_padded = comp - c_ctx->nr_valid;
- } else {
- rec_ctx->nr_valid = c_ctx->nr_valid - comp;
- rec_ctx->nr_padded = c_ctx->nr_padded;
-
- c_ctx->nr_valid = comp;
- c_ctx->nr_padded = 0;
- }
-
- recovery->rqd = rec_rqd;
- recovery->pblk = pblk;
-
- return 0;
-}
-
int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf)
{
u32 crc;
pblk_rb_sync_end(&pblk->rwb, &flags);
}
-/* When a write fails, we are not sure whether the block has grown bad or a page
- * range is more susceptible to write errors. If a high number of pages fail, we
- * assume that the block is bad and we mark it accordingly. In all cases, we
- * remap and resubmit the failed entries as fast as possible; if a flush is
- * waiting on a completion, the whole stack would stall otherwise.
- */
-static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd)
+/* Map remaining sectors in chunk, starting from ppa */
+static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa)
{
- void *comp_bits = &rqd->ppa_status;
- struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
- struct pblk_rec_ctx *recovery;
- struct ppa_addr *ppa_list = rqd->ppa_list;
- int nr_ppas = rqd->nr_ppas;
- unsigned int c_entries;
- int bit, ret;
+ struct nvm_tgt_dev *dev = pblk->dev;
+ struct nvm_geo *geo = &dev->geo;
+ struct pblk_line *line;
+ struct ppa_addr map_ppa = *ppa;
+ u64 paddr;
+ int done = 0;
- if (unlikely(nr_ppas == 1))
- ppa_list = &rqd->ppa_addr;
+ line = &pblk->lines[pblk_ppa_to_line(*ppa)];
+ spin_lock(&line->lock);
- recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC);
+ while (!done) {
+ paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa);
- INIT_LIST_HEAD(&recovery->failed);
+ if (!test_and_set_bit(paddr, line->map_bitmap))
+ line->left_msecs--;
- bit = -1;
- while ((bit = find_next_bit(comp_bits, nr_ppas, bit + 1)) < nr_ppas) {
- struct pblk_rb_entry *entry;
- struct ppa_addr ppa;
+ if (!test_and_set_bit(paddr, line->invalid_bitmap))
+ le32_add_cpu(line->vsc, -1);
- /* Logic error */
- if (bit > c_ctx->nr_valid) {
- WARN_ONCE(1, "pblk: corrupted write request\n");
- mempool_free(recovery, &pblk->rec_pool);
- goto out;
+ if (geo->version == NVM_OCSSD_SPEC_12) {
+ map_ppa.ppa++;
+ if (map_ppa.g.pg == geo->num_pg)
+ done = 1;
+ } else {
+ map_ppa.m.sec++;
+ if (map_ppa.m.sec == geo->clba)
+ done = 1;
}
+ }
- ppa = ppa_list[bit];
- entry = pblk_rb_sync_scan_entry(&pblk->rwb, &ppa);
- if (!entry) {
- pr_err("pblk: could not scan entry on write failure\n");
- mempool_free(recovery, &pblk->rec_pool);
- goto out;
- }
+ spin_unlock(&line->lock);
+}
+
+static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry,
+ unsigned int nr_entries)
+{
+ struct pblk_rb *rb = &pblk->rwb;
+ struct pblk_rb_entry *entry;
+ struct pblk_line *line;
+ struct pblk_w_ctx *w_ctx;
+ struct ppa_addr ppa_l2p;
+ int flags;
+ unsigned int pos, i;
+
+ spin_lock(&pblk->trans_lock);
+ pos = sentry;
+ for (i = 0; i < nr_entries; i++) {
+ entry = &rb->entries[pos];
+ w_ctx = &entry->w_ctx;
+
+ /* Check if the lba has been overwritten */
+ ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba);
+ if (!pblk_ppa_comp(ppa_l2p, entry->cacheline))
+ w_ctx->lba = ADDR_EMPTY;
+
+ /* Mark up the entry as submittable again */
+ flags = READ_ONCE(w_ctx->flags);
+ flags |= PBLK_WRITTEN_DATA;
+ /* Release flags on write context. Protect from writes */
+ smp_store_release(&w_ctx->flags, flags);
- /* The list is filled first and emptied afterwards. No need for
- * protecting it with a lock
+ /* Decrese the reference count to the line as we will
+ * re-map these entries
*/
- list_add_tail(&entry->index, &recovery->failed);
+ line = &pblk->lines[pblk_ppa_to_line(w_ctx->ppa)];
+ kref_put(&line->ref, pblk_line_put);
+
+ pos = (pos + 1) & (rb->nr_entries - 1);
}
+ spin_unlock(&pblk->trans_lock);
+}
- c_entries = find_first_bit(comp_bits, nr_ppas);
- ret = pblk_recov_setup_rq(pblk, c_ctx, recovery, comp_bits, c_entries);
- if (ret) {
- pr_err("pblk: could not recover from write failure\n");
- mempool_free(recovery, &pblk->rec_pool);
- goto out;
+static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx)
+{
+ struct pblk_c_ctx *r_ctx;
+
+ r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL);
+ if (!r_ctx)
+ return;
+
+ r_ctx->lun_bitmap = NULL;
+ r_ctx->sentry = c_ctx->sentry;
+ r_ctx->nr_valid = c_ctx->nr_valid;
+ r_ctx->nr_padded = c_ctx->nr_padded;
+
+ spin_lock(&pblk->resubmit_lock);
+ list_add_tail(&r_ctx->list, &pblk->resubmit_list);
+ spin_unlock(&pblk->resubmit_lock);
+
+#ifdef CONFIG_NVM_DEBUG
+ atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes);
+#endif
+}
+
+static void pblk_submit_rec(struct work_struct *work)
+{
+ struct pblk_rec_ctx *recovery =
+ container_of(work, struct pblk_rec_ctx, ws_rec);
+ struct pblk *pblk = recovery->pblk;
+ struct nvm_rq *rqd = recovery->rqd;
+ struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
+ struct ppa_addr *ppa_list;
+
+ pblk_log_write_err(pblk, rqd);
+
+ if (rqd->nr_ppas == 1)
+ ppa_list = &rqd->ppa_addr;
+ else
+ ppa_list = rqd->ppa_list;
+
+ pblk_map_remaining(pblk, ppa_list);
+ pblk_queue_resubmit(pblk, c_ctx);
+
+ pblk_up_rq(pblk, rqd->ppa_list, rqd->nr_ppas, c_ctx->lun_bitmap);
+ if (c_ctx->nr_padded)
+ pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
+ c_ctx->nr_padded);
+ bio_put(rqd->bio);
+ pblk_free_rqd(pblk, rqd, PBLK_WRITE);
+ mempool_free(recovery, &pblk->rec_pool);
+
+ atomic_dec(&pblk->inflight_io);
+}
+
+
+static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd)
+{
+ struct pblk_rec_ctx *recovery;
+
+ recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC);
+ if (!recovery) {
+ pr_err("pblk: could not allocate recovery work\n");
+ return;
}
+ recovery->pblk = pblk;
+ recovery->rqd = rqd;
+
INIT_WORK(&recovery->ws_rec, pblk_submit_rec);
queue_work(pblk->close_wq, &recovery->ws_rec);
-
-out:
- pblk_complete_write(pblk, rqd, c_ctx);
}
static void pblk_end_io_write(struct nvm_rq *rqd)
struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
if (rqd->error) {
- pblk_log_write_err(pblk, rqd);
- return pblk_end_w_fail(pblk, rqd);
+ pblk_end_w_fail(pblk, rqd);
+ return;
}
#ifdef CONFIG_NVM_DEBUG
else
return 0;
}
-int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd,
- struct pblk_c_ctx *c_ctx)
-{
- struct pblk_line_meta *lm = &pblk->lm;
- unsigned long *lun_bitmap;
- int ret;
-
- lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL);
- if (!lun_bitmap)
- return -ENOMEM;
-
- c_ctx->lun_bitmap = lun_bitmap;
-
- ret = pblk_alloc_w_rq(pblk, rqd, rqd->nr_ppas, pblk_end_io_write);
- if (ret)
- return ret;
-
- pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, c_ctx->nr_valid, 0);
-
- rqd->ppa_status = (u64)0;
- rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE);
-
- return ret;
-}
-
static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail,
unsigned int secs_to_flush)
{
bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len,
l_mg->emeta_alloc_type, GFP_KERNEL);
if (IS_ERR(bio)) {
+ pr_err("pblk: failed to map emeta io");
ret = PTR_ERR(bio);
goto fail_free_rqd;
}
unsigned int secs_avail, secs_to_sync, secs_to_com;
unsigned int secs_to_flush;
unsigned long pos;
+ unsigned int resubmit;
- /* If there are no sectors in the cache, flushes (bios without data)
- * will be cleared on the cache threads
- */
- secs_avail = pblk_rb_read_count(&pblk->rwb);
- if (!secs_avail)
- return 1;
-
- secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb);
- if (!secs_to_flush && secs_avail < pblk->min_write_pgs)
- return 1;
-
- secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, secs_to_flush);
- if (secs_to_sync > pblk->max_write_pgs) {
- pr_err("pblk: bad buffer sync calculation\n");
- return 1;
- }
+ spin_lock(&pblk->resubmit_lock);
+ resubmit = !list_empty(&pblk->resubmit_list);
+ spin_unlock(&pblk->resubmit_lock);
+
+ /* Resubmit failed writes first */
+ if (resubmit) {
+ struct pblk_c_ctx *r_ctx;
+
+ spin_lock(&pblk->resubmit_lock);
+ r_ctx = list_first_entry(&pblk->resubmit_list,
+ struct pblk_c_ctx, list);
+ list_del(&r_ctx->list);
+ spin_unlock(&pblk->resubmit_lock);
+
+ secs_avail = r_ctx->nr_valid;
+ pos = r_ctx->sentry;
+
+ pblk_prepare_resubmit(pblk, pos, secs_avail);
+ secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
+ secs_avail);
- secs_to_com = (secs_to_sync > secs_avail) ? secs_avail : secs_to_sync;
- pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
+ kfree(r_ctx);
+ } else {
+ /* If there are no sectors in the cache,
+ * flushes (bios without data) will be cleared on
+ * the cache threads
+ */
+ secs_avail = pblk_rb_read_count(&pblk->rwb);
+ if (!secs_avail)
+ return 1;
+
+ secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb);
+ if (!secs_to_flush && secs_avail < pblk->min_write_pgs)
+ return 1;
+
+ secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
+ secs_to_flush);
+ if (secs_to_sync > pblk->max_write_pgs) {
+ pr_err("pblk: bad buffer sync calculation\n");
+ return 1;
+ }
+
+ secs_to_com = (secs_to_sync > secs_avail) ?
+ secs_avail : secs_to_sync;
+ pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
+ }
bio = bio_alloc(GFP_KERNEL, secs_to_sync);
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