[PATCH v4 1/5] lightnvm: pblk: Move lba list to partial read context

[Igor Konopko <igor.j.konopko@intel.com>]

Currently DMA allocated memory is reused on partial read
for lba_list_mem and lba_list_media arrays. In preparation
for dynamic DMA pool sizes we need to move this arrays
into pblk_pr_ctx structures.

Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
---
 drivers/lightnvm/pblk-read.c | 20 +++++---------------
 drivers/lightnvm/pblk.h      |  2 ++
 2 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index 9fba614adeeb..19917d3c19b3 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -224,7 +224,6 @@ static void pblk_end_partial_read(struct nvm_rq *rqd)
 	unsigned long *read_bitmap = pr_ctx->bitmap;
 	int nr_secs = pr_ctx->orig_nr_secs;
 	int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs);
-	__le64 *lba_list_mem, *lba_list_media;
 	void *src_p, *dst_p;
 	int hole, i;
 
@@ -237,13 +236,9 @@ static void pblk_end_partial_read(struct nvm_rq *rqd)
 		rqd->ppa_list[0] = ppa;
 	}
 
-	/* Re-use allocated memory for intermediate lbas */
-	lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size);
-	lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size);
-
 	for (i = 0; i < nr_secs; i++) {
-		lba_list_media[i] = meta_list[i].lba;
-		meta_list[i].lba = lba_list_mem[i];
+		pr_ctx->lba_list_media[i] = meta_list[i].lba;
+		meta_list[i].lba = pr_ctx->lba_list_mem[i];
 	}
 
 	/* Fill the holes in the original bio */
@@ -255,7 +250,7 @@ static void pblk_end_partial_read(struct nvm_rq *rqd)
 		line = pblk_ppa_to_line(pblk, rqd->ppa_list[i]);
 		kref_put(&line->ref, pblk_line_put);
 
-		meta_list[hole].lba = lba_list_media[i];
+		meta_list[hole].lba = pr_ctx->lba_list_media[i];
 
 		src_bv = new_bio->bi_io_vec[i++];
 		dst_bv = bio->bi_io_vec[bio_init_idx + hole];
@@ -295,13 +290,9 @@ static int pblk_setup_partial_read(struct pblk *pblk, struct nvm_rq *rqd,
 	struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd);
 	struct pblk_pr_ctx *pr_ctx;
 	struct bio *new_bio, *bio = r_ctx->private;
-	__le64 *lba_list_mem;
 	int nr_secs = rqd->nr_ppas;
 	int i;
 
-	/* Re-use allocated memory for intermediate lbas */
-	lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size);
-
 	new_bio = bio_alloc(GFP_KERNEL, nr_holes);
 
 	if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes))
@@ -312,12 +303,12 @@ static int pblk_setup_partial_read(struct pblk *pblk, struct nvm_rq *rqd,
 		goto fail_free_pages;
 	}
 
-	pr_ctx = kmalloc(sizeof(struct pblk_pr_ctx), GFP_KERNEL);
+	pr_ctx = kzalloc(sizeof(struct pblk_pr_ctx), GFP_KERNEL);
 	if (!pr_ctx)
 		goto fail_free_pages;
 
 	for (i = 0; i < nr_secs; i++)
-		lba_list_mem[i] = meta_list[i].lba;
+		pr_ctx->lba_list_mem[i] = meta_list[i].lba;
 
 	new_bio->bi_iter.bi_sector = 0; /* internal bio */
 	bio_set_op_attrs(new_bio, REQ_OP_READ, 0);
@@ -325,7 +316,6 @@ static int pblk_setup_partial_read(struct pblk *pblk, struct nvm_rq *rqd,
 	rqd->bio = new_bio;
 	rqd->nr_ppas = nr_holes;
 
-	pr_ctx->ppa_ptr = NULL;
 	pr_ctx->orig_bio = bio;
 	bitmap_copy(pr_ctx->bitmap, read_bitmap, NVM_MAX_VLBA);
 	pr_ctx->bio_init_idx = bio_init_idx;
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index e5b88a25d4d6..0e9d3960ac4c 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -132,6 +132,8 @@ struct pblk_pr_ctx {
 	unsigned int bio_init_idx;
 	void *ppa_ptr;
 	dma_addr_t dma_ppa_list;
+	__le64 lba_list_mem[NVM_MAX_VLBA];
+	__le64 lba_list_media[NVM_MAX_VLBA];
 };
 
 /* Pad context */
-- 
2.14.5