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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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9
include/linux/nd.h
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@@ -15,6 +15,7 @@
#include <linux/fs.h>
#include <linux/ndctl.h>
#include <linux/device.h>
#include <linux/badblocks.h>
enum nvdimm_event {
NVDIMM_REVALIDATE_POISON,
@@ -55,13 +56,19 @@ static inline struct nd_namespace_common *to_ndns(struct device *dev)
}
/**
* struct nd_namespace_io - infrastructure for loading an nd_pmem instance
* struct nd_namespace_io - device representation of a persistent memory range
* @dev: namespace device created by the nd region driver
* @res: struct resource conversion of a NFIT SPA table
* @size: cached resource_size(@res) for fast path size checks
* @addr: virtual address to access the namespace range
* @bb: badblocks list for the namespace range
*/
struct nd_namespace_io {
struct nd_namespace_common common;
struct resource res;
resource_size_t size;
void __pmem *addr;
struct badblocks bb;
};
/**