lightnvm: pblk: use kvmalloc for metadata

There is no reason now not to use kvmalloc, so replace the internal
metadata allocation scheme.
Reviewed-by: Javier González <javier@javigon.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hans Holmberg <hans@owltronix.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-core.c

@@ -1839,8 +1839,7 @@ static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
 	struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
 	struct pblk_emeta *emeta = line->emeta;
 
-	w_err_gc->lba_list = pblk_malloc(lba_list_size,
-					 l_mg->emeta_alloc_type, GFP_KERNEL);
+	w_err_gc->lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
 	memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf),
 				lba_list_size);
 }

drivers/lightnvm/pblk-gc.c

@@ -132,14 +132,12 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
 				       struct pblk_line *line)
 {
 	struct line_emeta *emeta_buf;
-	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 	struct pblk_line_meta *lm = &pblk->lm;
 	unsigned int lba_list_size = lm->emeta_len[2];
 	__le64 *lba_list;
 	int ret;
 
-	emeta_buf = pblk_malloc(lm->emeta_len[0],
-				l_mg->emeta_alloc_type, GFP_KERNEL);
+	emeta_buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
 	if (!emeta_buf)
 		return NULL;
 
@@ -147,7 +145,7 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
 	if (ret) {
 		pblk_err(pblk, "line %d read emeta failed (%d)\n",
 				line->id, ret);
-		pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
+		kvfree(emeta_buf);
 		return NULL;
 	}
 
@@ -161,16 +159,16 @@ static __le64 *get_lba_list_from_emeta(struct pblk *pblk,
 	if (ret) {
 		pblk_err(pblk, "inconsistent emeta (line %d)\n",
 				line->id);
-		pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
+		kvfree(emeta_buf);
 		return NULL;
 	}
 
-	lba_list = pblk_malloc(lba_list_size,
-			       l_mg->emeta_alloc_type, GFP_KERNEL);
+	lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
+
 	if (lba_list)
 		memcpy(lba_list, emeta_to_lbas(pblk, emeta_buf), lba_list_size);
 
-	pblk_mfree(emeta_buf, l_mg->emeta_alloc_type);
+	kvfree(emeta_buf);
 
 	return lba_list;
 }
@@ -181,7 +179,6 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
 									ws);
 	struct pblk *pblk = line_ws->pblk;
 	struct pblk_line *line = line_ws->line;
-	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 	struct pblk_line_meta *lm = &pblk->lm;
 	struct nvm_tgt_dev *dev = pblk->dev;
 	struct nvm_geo *geo = &dev->geo;
@@ -272,7 +269,7 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
 		goto next_rq;
 
 out:
-	pblk_mfree(lba_list, l_mg->emeta_alloc_type);
+	kvfree(lba_list);
 	kfree(line_ws);
 	kfree(invalid_bitmap);
 
@@ -286,7 +283,7 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work)
 fail_free_gc_rq:
 	kfree(gc_rq);
 fail_free_lba_list:
-	pblk_mfree(lba_list, l_mg->emeta_alloc_type);
+	kvfree(lba_list);
 fail_free_invalid_bitmap:
 	kfree(invalid_bitmap);
 fail_free_ws:

drivers/lightnvm/pblk-init.c

@@ -543,7 +543,7 @@ static void pblk_line_mg_free(struct pblk *pblk)
 
 	for (i = 0; i < PBLK_DATA_LINES; i++) {
 		kfree(l_mg->sline_meta[i]);
-		pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
+		kvfree(l_mg->eline_meta[i]->buf);
 		kfree(l_mg->eline_meta[i]);
 	}
 
@@ -560,7 +560,7 @@ static void pblk_line_meta_free(struct pblk_line_mgmt *l_mg,
 	kfree(line->erase_bitmap);
 	kfree(line->chks);
 
-	pblk_mfree(w_err_gc->lba_list, l_mg->emeta_alloc_type);
+	kvfree(w_err_gc->lba_list);
 	kfree(w_err_gc);
 }
 
@@ -890,21 +890,7 @@ static int pblk_line_mg_init(struct pblk *pblk)
 		if (!emeta)
 			goto fail_free_emeta;
 
-		if (lm->emeta_len[0] > KMALLOC_MAX_CACHE_SIZE) {
-			l_mg->emeta_alloc_type = PBLK_VMALLOC_META;
-
-			emeta->buf = vmalloc(lm->emeta_len[0]);
-			if (!emeta->buf) {
-				kfree(emeta);
-				goto fail_free_emeta;
-			}
-
-			emeta->nr_entries = lm->emeta_sec[0];
-			l_mg->eline_meta[i] = emeta;
-		} else {
-			l_mg->emeta_alloc_type = PBLK_KMALLOC_META;
-
-			emeta->buf = kmalloc(lm->emeta_len[0], GFP_KERNEL);
+		emeta->buf = kvmalloc(lm->emeta_len[0], GFP_KERNEL);
 		if (!emeta->buf) {
 			kfree(emeta);
 			goto fail_free_emeta;
@@ -913,7 +899,6 @@ static int pblk_line_mg_init(struct pblk *pblk)
 		emeta->nr_entries = lm->emeta_sec[0];
 		l_mg->eline_meta[i] = emeta;
 	}
-	}
 
 	for (i = 0; i < l_mg->nr_lines; i++)
 		l_mg->vsc_list[i] = cpu_to_le32(EMPTY_ENTRY);
@@ -926,10 +911,7 @@ static int pblk_line_mg_init(struct pblk *pblk)
 
 fail_free_emeta:
 	while (--i >= 0) {
-		if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
-			vfree(l_mg->eline_meta[i]->buf);
-		else
-			kfree(l_mg->eline_meta[i]->buf);
+		kvfree(l_mg->eline_meta[i]->buf);
 		kfree(l_mg->eline_meta[i]);
 	}
 

drivers/lightnvm/pblk.h

@@ -481,11 +481,6 @@ struct pblk_line {
 
 #define PBLK_DATA_LINES 4
 
-enum {
-	PBLK_KMALLOC_META = 1,
-	PBLK_VMALLOC_META = 2,
-};
-
 enum {
 	PBLK_EMETA_TYPE_HEADER = 1,	/* struct line_emeta first sector */
 	PBLK_EMETA_TYPE_LLBA = 2,	/* lba list - type: __le64 */
@@ -521,9 +516,6 @@ struct pblk_line_mgmt {
 
 	__le32 *vsc_list;		/* Valid sector counts for all lines */
 
-	/* Metadata allocation type: VMALLOC | KMALLOC */
-	int emeta_alloc_type;
-
 	/* Pre-allocated metadata for data lines */
 	struct pblk_smeta *sline_meta[PBLK_DATA_LINES];
 	struct pblk_emeta *eline_meta[PBLK_DATA_LINES];
@@ -934,21 +926,6 @@ void pblk_rl_werr_line_out(struct pblk_rl *rl);
 int pblk_sysfs_init(struct gendisk *tdisk);
 void pblk_sysfs_exit(struct gendisk *tdisk);
 
-static inline void *pblk_malloc(size_t size, int type, gfp_t flags)
-{
-	if (type == PBLK_KMALLOC_META)
-		return kmalloc(size, flags);
-	return vmalloc(size);
-}
-
-static inline void pblk_mfree(void *ptr, int type)
-{
-	if (type == PBLK_KMALLOC_META)
-		kfree(ptr);
-	else
-		vfree(ptr);
-}
-
 static inline struct nvm_rq *nvm_rq_from_c_ctx(void *c_ctx)
 {
 	return c_ctx - sizeof(struct nvm_rq);