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libnvdimm, pmem, pfn: make pmem_rw_bytes generic and refactor pfn setup

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In preparation for providing an alternative (to block device) access
mechanism to persistent memory, convert pmem_rw_bytes() to
nsio_rw_bytes().  This allows ->rw_bytes() functionality without
requiring a 'struct pmem_device' to be instantiated.

In other words, when ->rw_bytes() is in use i/o is driven through
'struct nd_namespace_io', otherwise it is driven through 'struct
pmem_device' and the block layer.  This consolidates the disjoint calls
to devm_exit_badblocks() and devm_memunmap() into a common
devm_nsio_disable() and cleans up the init path to use a unified
pmem_attach_disk() implementation.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2016-03-22 00:22:16 -07:00
parent 947df02d25
commit 200c79da82
9 changed files with 211 additions and 173 deletions
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4
drivers/nvdimm/pfn_devs.c
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@@ -410,8 +410,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
}
EXPORT_SYMBOL(nd_pfn_validate);
int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns,
void *drvdata)
int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
{
int rc;
struct nd_pfn *nd_pfn;
@@ -427,7 +426,6 @@ int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns,
nvdimm_bus_unlock(&ndns->dev);
if (!pfn_dev)
return -ENOMEM;
dev_set_drvdata(pfn_dev, drvdata);
pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
nd_pfn = to_nd_pfn(pfn_dev);
nd_pfn->pfn_sb = pfn_sb;