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Subject[GIT PULL 31/58] lightnvm: pblk: refactor rqd alloc/free
Date
From: Javier González <javier@cnexlabs.com>

Refactor the rqd allocation and free functions so that all I/O types can
use these helper functions.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
---
drivers/lightnvm/pblk-core.c | 40 ++++++++++++++++++++++++++++++----------
drivers/lightnvm/pblk-read.c | 2 --
drivers/lightnvm/pblk-recovery.c | 2 --
drivers/lightnvm/pblk-write.c | 7 -------
drivers/lightnvm/pblk.h | 4 ++--
5 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index a492964..0de3875 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -146,18 +146,26 @@ static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
spin_unlock(&pblk->trans_lock);
}

-struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw)
+/* Caller must guarantee that the request is a valid type */
+struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type)
{
mempool_t *pool;
struct nvm_rq *rqd;
int rq_size;

- if (rw == PBLK_WRITE) {
+ switch (type) {
+ case PBLK_WRITE:
+ case PBLK_WRITE_INT:
pool = pblk->w_rq_pool;
rq_size = pblk_w_rq_size;
- } else {
+ break;
+ case PBLK_READ:
pool = pblk->r_rq_pool;
rq_size = pblk_g_rq_size;
+ break;
+ default:
+ pool = pblk->e_rq_pool;
+ rq_size = pblk_g_rq_size;
}

rqd = mempool_alloc(pool, GFP_KERNEL);
@@ -166,15 +174,30 @@ struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw)
return rqd;
}

-void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw)
+/* Typically used on completion path. Cannot guarantee request consistency */
+void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
{
+ struct nvm_tgt_dev *dev = pblk->dev;
mempool_t *pool;

- if (rw == PBLK_WRITE)
+ switch (type) {
+ case PBLK_WRITE:
+ kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap);
+ case PBLK_WRITE_INT:
pool = pblk->w_rq_pool;
- else
+ break;
+ case PBLK_READ:
pool = pblk->r_rq_pool;
+ break;
+ case PBLK_ERASE:
+ pool = pblk->e_rq_pool;
+ break;
+ default:
+ pr_err("pblk: trying to free unknown rqd type\n");
+ return;
+ }

+ nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
mempool_free(rqd, pool);
}

@@ -1470,8 +1493,7 @@ int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
struct nvm_rq *rqd;
int err;

- rqd = mempool_alloc(pblk->e_rq_pool, GFP_KERNEL);
- memset(rqd, 0, pblk_g_rq_size);
+ rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);

pblk_setup_e_rq(pblk, rqd, ppa);

@@ -1739,8 +1761,6 @@ void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas,
rlun = &pblk->luns[bit];
up(&rlun->wr_sem);
}
-
- kfree(lun_bitmap);
}

void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index 4b1722f..d7c90c3 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -124,8 +124,6 @@ static void pblk_end_io_read(struct nvm_rq *rqd)
WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n");
#endif

- nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
-
bio_put(bio);
if (r_ctx->private) {
struct bio *orig_bio = r_ctx->private;
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index 19f2fb1..686bc17 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -329,11 +329,9 @@ static void pblk_end_io_recov(struct nvm_rq *rqd)
{
struct pblk_pad_rq *pad_rq = rqd->private;
struct pblk *pblk = pad_rq->pblk;
- struct nvm_tgt_dev *dev = pblk->dev;

pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas);

- nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);

atomic_dec(&pblk->inflight_io);
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index c1b8b83..f2e846f 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -20,7 +20,6 @@
static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
struct pblk_c_ctx *c_ctx)
{
- struct nvm_tgt_dev *dev = pblk->dev;
struct bio *original_bio;
unsigned long ret;
int i;
@@ -43,8 +42,6 @@ static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,

ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid);

- nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
-
bio_put(rqd->bio);
pblk_free_rqd(pblk, rqd, PBLK_WRITE);

@@ -176,7 +173,6 @@ static void pblk_end_io_write(struct nvm_rq *rqd)
static void pblk_end_io_write_meta(struct nvm_rq *rqd)
{
struct pblk *pblk = rqd->private;
- struct nvm_tgt_dev *dev = pblk->dev;
struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd);
struct pblk_line *line = m_ctx->private;
struct pblk_emeta *emeta = line->emeta;
@@ -194,7 +190,6 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws,
GFP_ATOMIC, pblk->close_wq);

- nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);

atomic_dec(&pblk->inflight_io);
@@ -419,8 +414,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
pblk_dealloc_page(pblk, meta_line, rq_ppas);
list_add(&meta_line->list, &meta_line->list);
spin_unlock(&l_mg->close_lock);
-
- nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
fail_free_bio:
bio_put(bio);
fail_free_rqd:
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index d01e003..12a20f8 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -699,11 +699,11 @@ ssize_t pblk_rb_sysfs(struct pblk_rb *rb, char *buf);
/*
* pblk core
*/
-struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw);
+struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type);
+void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type);
void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write);
int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd,
struct pblk_c_ctx *c_ctx);
-void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw);
void pblk_wait_for_meta(struct pblk *pblk);
struct ppa_addr pblk_get_lba_map(struct pblk *pblk, sector_t lba);
void pblk_discard(struct pblk *pblk, struct bio *bio);
--
2.9.3
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