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path: root/drivers/lightnvm/pblk-rb.c
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Diffstat (limited to 'drivers/lightnvm/pblk-rb.c')
-rw-r--r--drivers/lightnvm/pblk-rb.c106
1 files changed, 74 insertions, 32 deletions
diff --git a/drivers/lightnvm/pblk-rb.c b/drivers/lightnvm/pblk-rb.c
index 045384ddc1f9..5ecc154f6831 100644
--- a/drivers/lightnvm/pblk-rb.c
+++ b/drivers/lightnvm/pblk-rb.c
@@ -150,6 +150,7 @@ try:
/* Release flags on context. Protect from writes and reads */
smp_store_release(&w_ctx->flags, PBLK_WRITABLE_ENTRY);
pblk_ppa_set_empty(&w_ctx->ppa);
+ w_ctx->lba = ADDR_EMPTY;
}
#define pblk_rb_ring_count(head, tail, size) CIRC_CNT(head, tail, size)
@@ -180,6 +181,14 @@ unsigned int pblk_rb_read_count(struct pblk_rb *rb)
return pblk_rb_ring_count(mem, subm, rb->nr_entries);
}
+unsigned int pblk_rb_sync_count(struct pblk_rb *rb)
+{
+ unsigned int mem = READ_ONCE(rb->mem);
+ unsigned int sync = READ_ONCE(rb->sync);
+
+ return pblk_rb_ring_count(mem, sync, rb->nr_entries);
+}
+
unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int nr_entries)
{
unsigned int subm;
@@ -199,12 +208,22 @@ static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd,
struct pblk_line *line;
struct pblk_rb_entry *entry;
struct pblk_w_ctx *w_ctx;
+ unsigned int user_io = 0, gc_io = 0;
unsigned int i;
+ int flags;
for (i = 0; i < to_update; i++) {
entry = &rb->entries[*l2p_upd];
w_ctx = &entry->w_ctx;
+ flags = READ_ONCE(entry->w_ctx.flags);
+ if (flags & PBLK_IOTYPE_USER)
+ user_io++;
+ else if (flags & PBLK_IOTYPE_GC)
+ gc_io++;
+ else
+ WARN(1, "pblk: unknown IO type\n");
+
pblk_update_map_dev(pblk, w_ctx->lba, w_ctx->ppa,
entry->cacheline);
@@ -214,6 +233,8 @@ static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd,
*l2p_upd = (*l2p_upd + 1) & (rb->nr_entries - 1);
}
+ pblk_rl_out(&pblk->rl, user_io, gc_io);
+
return 0;
}
@@ -357,6 +378,9 @@ static int pblk_rb_sync_point_set(struct pblk_rb *rb, struct bio *bio,
/* Protect syncs */
smp_store_release(&rb->sync_point, sync_point);
+ if (!bio)
+ return 0;
+
spin_lock_irq(&rb->s_lock);
bio_list_add(&entry->w_ctx.bios, bio);
spin_unlock_irq(&rb->s_lock);
@@ -395,6 +419,17 @@ static int pblk_rb_may_write(struct pblk_rb *rb, unsigned int nr_entries,
return 1;
}
+void pblk_rb_flush(struct pblk_rb *rb)
+{
+ struct pblk *pblk = container_of(rb, struct pblk, rwb);
+ unsigned int mem = READ_ONCE(rb->mem);
+
+ if (pblk_rb_sync_point_set(rb, NULL, mem))
+ return;
+
+ pblk_write_should_kick(pblk);
+}
+
static int pblk_rb_may_write_flush(struct pblk_rb *rb, unsigned int nr_entries,
unsigned int *pos, struct bio *bio,
int *io_ret)
@@ -431,15 +466,16 @@ int pblk_rb_may_write_user(struct pblk_rb *rb, struct bio *bio,
unsigned int nr_entries, unsigned int *pos)
{
struct pblk *pblk = container_of(rb, struct pblk, rwb);
- int flush_done;
+ int io_ret;
spin_lock(&rb->w_lock);
- if (!pblk_rl_user_may_insert(&pblk->rl, nr_entries)) {
+ io_ret = pblk_rl_user_may_insert(&pblk->rl, nr_entries);
+ if (io_ret) {
spin_unlock(&rb->w_lock);
- return NVM_IO_REQUEUE;
+ return io_ret;
}
- if (!pblk_rb_may_write_flush(rb, nr_entries, pos, bio, &flush_done)) {
+ if (!pblk_rb_may_write_flush(rb, nr_entries, pos, bio, &io_ret)) {
spin_unlock(&rb->w_lock);
return NVM_IO_REQUEUE;
}
@@ -447,7 +483,7 @@ int pblk_rb_may_write_user(struct pblk_rb *rb, struct bio *bio,
pblk_rl_user_in(&pblk->rl, nr_entries);
spin_unlock(&rb->w_lock);
- return flush_done;
+ return io_ret;
}
/*
@@ -521,20 +557,18 @@ out:
* This function is used by the write thread to form the write bio that will
* persist data on the write buffer to the media.
*/
-unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct bio *bio,
- struct pblk_c_ctx *c_ctx,
- unsigned int pos,
- unsigned int nr_entries,
- unsigned int count)
+unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd,
+ struct bio *bio, unsigned int pos,
+ unsigned int nr_entries, unsigned int count)
{
struct pblk *pblk = container_of(rb, struct pblk, rwb);
+ struct request_queue *q = pblk->dev->q;
+ struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
struct pblk_rb_entry *entry;
struct page *page;
- unsigned int pad = 0, read = 0, to_read = nr_entries;
- unsigned int user_io = 0, gc_io = 0;
+ unsigned int pad = 0, to_read = nr_entries;
unsigned int i;
int flags;
- int ret;
if (count < nr_entries) {
pad = nr_entries - count;
@@ -553,15 +587,10 @@ unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct bio *bio,
*/
try:
flags = READ_ONCE(entry->w_ctx.flags);
- if (!(flags & PBLK_WRITTEN_DATA))
+ if (!(flags & PBLK_WRITTEN_DATA)) {
+ io_schedule();
goto try;
-
- if (flags & PBLK_IOTYPE_USER)
- user_io++;
- else if (flags & PBLK_IOTYPE_GC)
- gc_io++;
- else
- WARN(1, "pblk: unknown IO type\n");
+ }
page = virt_to_page(entry->data);
if (!page) {
@@ -570,17 +599,17 @@ try:
flags |= PBLK_SUBMITTED_ENTRY;
/* Release flags on context. Protect from writes */
smp_store_release(&entry->w_ctx.flags, flags);
- goto out;
+ return NVM_IO_ERR;
}
- ret = bio_add_page(bio, page, rb->seg_size, 0);
- if (ret != rb->seg_size) {
+ if (bio_add_pc_page(q, bio, page, rb->seg_size, 0) !=
+ rb->seg_size) {
pr_err("pblk: could not add page to write bio\n");
flags &= ~PBLK_WRITTEN_DATA;
flags |= PBLK_SUBMITTED_ENTRY;
/* Release flags on context. Protect from writes */
smp_store_release(&entry->w_ctx.flags, flags);
- goto out;
+ return NVM_IO_ERR;
}
if (flags & PBLK_FLUSH_ENTRY) {
@@ -607,14 +636,19 @@ try:
pos = (pos + 1) & (rb->nr_entries - 1);
}
- read = to_read;
- pblk_rl_out(&pblk->rl, user_io, gc_io);
+ if (pad) {
+ if (pblk_bio_add_pages(pblk, bio, GFP_KERNEL, pad)) {
+ pr_err("pblk: could not pad page in write bio\n");
+ return NVM_IO_ERR;
+ }
+ }
+
#ifdef CONFIG_NVM_DEBUG
atomic_long_add(pad, &((struct pblk *)
(container_of(rb, struct pblk, rwb)))->padded_writes);
#endif
-out:
- return read;
+
+ return NVM_IO_OK;
}
/*
@@ -623,15 +657,17 @@ out:
* be directed to disk.
*/
int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
- u64 pos, int bio_iter)
+ struct ppa_addr ppa, int bio_iter)
{
+ struct pblk *pblk = container_of(rb, struct pblk, rwb);
struct pblk_rb_entry *entry;
struct pblk_w_ctx *w_ctx;
+ struct ppa_addr l2p_ppa;
+ u64 pos = pblk_addr_to_cacheline(ppa);
void *data;
int flags;
int ret = 1;
- spin_lock(&rb->w_lock);
#ifdef CONFIG_NVM_DEBUG
/* Caller must ensure that the access will not cause an overflow */
@@ -641,8 +677,14 @@ int pblk_rb_copy_to_bio(struct pblk_rb *rb, struct bio *bio, sector_t lba,
w_ctx = &entry->w_ctx;
flags = READ_ONCE(w_ctx->flags);
+ spin_lock(&rb->w_lock);
+ spin_lock(&pblk->trans_lock);
+ l2p_ppa = pblk_trans_map_get(pblk, lba);
+ spin_unlock(&pblk->trans_lock);
+
/* Check if the entry has been overwritten or is scheduled to be */
- if (w_ctx->lba != lba || flags & PBLK_WRITABLE_ENTRY) {
+ if (!pblk_ppa_comp(l2p_ppa, ppa) || w_ctx->lba != lba ||
+ flags & PBLK_WRITABLE_ENTRY) {
ret = 0;
goto out;
}