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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
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@@ -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);