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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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6
drivers/lightnvm/pblk.h
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@@ -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_ */