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lightnvm: dynamic DMA pool entry size

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Currently lightnvm and pblk uses single DMA pool, for which the entry
size always is equal to PAGE_SIZE. The contents of each entry allocated
from the DMA pool consists of a PPA list (8bytes * 64), leaving
56bytes * 64 space for metadata. Since the metadata field can be bigger,
such as 128 bytes, the static size does not cover this use-case.

This patch adds support for I/O metadata above 56 bytes by changing DMA
pool size based on device meta size and allows pblk to use OOB metadata
>=16B.

Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Igor Konopko 2018-12-11 20:16:24 +01:00 committed by Jens Axboe
parent faa79f27f0
commit 24828d0536
7 changed files with 23 additions and 13 deletions
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9
drivers/lightnvm/core.c
View File

@ -1140,7 +1140,7 @@ EXPORT_SYMBOL(nvm_alloc_dev);
int nvm_register(struct nvm_dev *dev)
{
int ret;
int ret, exp_pool_size;
if (!dev->q || !dev->ops)
return -EINVAL;
@ -1149,7 +1149,12 @@ int nvm_register(struct nvm_dev *dev)
if (ret)
return ret;
dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
exp_pool_size = max_t(int, PAGE_SIZE,
(NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos)));
exp_pool_size = round_up(exp_pool_size, PAGE_SIZE);
dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist",
exp_pool_size);
if (!dev->dma_pool) {
pr_err("nvm: could not create dma pool\n");
nvm_free(dev);

8
drivers/lightnvm/pblk-core.c
View File

@ -250,8 +250,8 @@ int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd)
if (rqd->nr_ppas == 1)
return 0;
rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size;
rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size;
rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size(pblk);
rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size(pblk);
return 0;
}
@ -846,8 +846,8 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
if (!meta_list)
return -ENOMEM;
ppa_list = meta_list + pblk_dma_meta_size;
dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
ppa_list = meta_list + pblk_dma_meta_size(pblk);
dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk);
next_rq:
memset(&rqd, 0, sizeof(struct nvm_rq));

2
drivers/lightnvm/pblk-init.c
View File

@ -406,7 +406,7 @@ static int pblk_core_init(struct pblk *pblk)
pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
pblk->oob_meta_size = geo->sos;
if (pblk->oob_meta_size != sizeof(struct pblk_sec_meta)) {
if (pblk->oob_meta_size < sizeof(struct pblk_sec_meta)) {
pblk_err(pblk, "Unsupported metadata size\n");
return -EINVAL;
}

4
drivers/lightnvm/pblk-recovery.c
View File

@ -481,8 +481,8 @@ static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line)
if (!meta_list)
return -ENOMEM;
ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
ppa_list = (void *)(meta_list) + pblk_dma_meta_size(pblk);
dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk);
data = kcalloc(pblk->max_write_pgs, geo->csecs, GFP_KERNEL);
if (!data) {

6
drivers/lightnvm/pblk.h
View File

@ -104,7 +104,6 @@ enum {
PBLK_RL_LOW = 4
};
#define pblk_dma_meta_size (sizeof(struct pblk_sec_meta) * NVM_MAX_VLBA)
#define pblk_dma_ppa_size (sizeof(u64) * NVM_MAX_VLBA)
/* write buffer completion context */
@ -1388,4 +1387,9 @@ static inline struct pblk_sec_meta *pblk_get_meta(struct pblk *pblk,
{
return meta + pblk->oob_meta_size * index;
}
static inline int pblk_dma_meta_size(struct pblk *pblk)
{
return pblk->oob_meta_size * NVM_MAX_VLBA;
}
#endif /* PBLK_H_ */

5
drivers/nvme/host/lightnvm.c
View File

@ -732,11 +732,12 @@ static int nvme_nvm_submit_io_sync(struct nvm_dev *dev, struct nvm_rq *rqd)
return ret;
}
static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name)
static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name,
int size)
{
struct nvme_ns *ns = nvmdev->q->queuedata;
return dma_pool_create(name, ns->ctrl->dev, PAGE_SIZE, PAGE_SIZE, 0);
return dma_pool_create(name, ns->ctrl->dev, size, PAGE_SIZE, 0);
}
static void nvme_nvm_destroy_dma_pool(void *pool)

2
include/linux/lightnvm.h
View File

@ -90,7 +90,7 @@ typedef int (nvm_get_chk_meta_fn)(struct nvm_dev *, sector_t, int,
struct nvm_chk_meta *);
typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
typedef int (nvm_submit_io_sync_fn)(struct nvm_dev *, struct nvm_rq *);
typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *);
typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *, int);
typedef void (nvm_destroy_dma_pool_fn)(void *);
typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t,
dma_addr_t *);