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lightnvm: simplify geometry enumeration

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Currently the geometry of an OCSSD is enumerated using a two step
approach:

First, nvm_register is called, the OCSSD identify command is issued,
and second the geometry sos and csecs values are read either from the
OCSSD identify if it is a 1.2 drive, or from the NVMe namespace data
structure if it is a 2.0 device.

This patch recombines it into a single step, such that nvm_register can
use the csecs and sos fields independent of which version is used. This
enables one to dynamically size the lightnvm subsystem dma pool.

Reviewed-by: Igor Konopko <igor.j.konopko@intel.com>
Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Matias Bjørling
2018-12-11 20:16:20 +01:00
committed by Jens Axboe
parent 361d889f83
commit 85136c0102
4 changed files with 20 additions and 30 deletions
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12
drivers/lightnvm/core.c
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@@ -1145,25 +1145,23 @@ int nvm_register(struct nvm_dev *dev)
if (!dev->q || !dev->ops)
return -EINVAL;
ret = nvm_init(dev);
if (ret)
return ret;
dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist");
if (!dev->dma_pool) {
pr_err("nvm: could not create dma pool\n");
nvm_free(dev);
return -ENOMEM;
}
ret = nvm_init(dev);
if (ret)
goto err_init;
/* register device with a supported media manager */
down_write(&nvm_lock);
list_add(&dev->devices, &nvm_devices);
up_write(&nvm_lock);
return 0;
err_init:
dev->ops->destroy_dma_pool(dev->dma_pool);
return ret;
}
EXPORT_SYMBOL(nvm_register);