From a14669ebc0e294f19b2290c294958b7741559d9d Mon Sep 17 00:00:00 2001 From: Igor Konopko Date: Sat, 4 May 2019 20:37:55 +0200 Subject: lightnvm: Inherit mdts from the parent nvme device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Current lightnvm and pblk implementation does not care about NVMe max data transfer size, which can be smaller than 64*K=256K. There are existing NVMe controllers which NVMe max data transfer size is lower that 256K (for example 128K, which happens for existing NVMe controllers which are NVMe spec compliant). Such a controllers are not able to handle command which contains 64 PPAs, since the the size of DMAed buffer will be above the capabilities of such a controller. Signed-off-by: Igor Konopko Reviewed-by: Hans Holmberg Reviewed-by: Javier González 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') diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index 5f82036fe322..c01f83b8fbaf 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -325,6 +325,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) struct nvm_target *t; struct nvm_tgt_dev *tgt_dev; void *targetdata; + unsigned int mdts; int ret; switch (create->conf.type) { @@ -412,8 +413,12 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) tdisk->private_data = targetdata; tqueue->queuedata = targetdata; - blk_queue_max_hw_sectors(tqueue, - (dev->geo.csecs >> 9) * NVM_MAX_VLBA); + mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA; + if (dev->geo.mdts) { + mdts = min_t(u32, dev->geo.mdts, + (dev->geo.csecs >> 9) * NVM_MAX_VLBA); + } + blk_queue_max_hw_sectors(tqueue, mdts); set_capacity(tdisk, tt->capacity(targetdata)); add_disk(tdisk); -- cgit