From 24828d0536bbedc9b265f2b01ffca99de3f6a7c7 Mon Sep 17 00:00:00 2001 From: Igor Konopko Date: Tue, 11 Dec 2018 20:16:24 +0100 Subject: lightnvm: dynamic DMA pool entry size MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Igor Konopko Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/core.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/lightnvm/core.c') diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index 69b841d682c7..5f82036fe322 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -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); -- cgit v1.2.3