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libnvdimm: infrastructure for btt devices

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NVDIMM namespaces, in addition to accepting "struct bio" based requests,
also have the capability to perform byte-aligned accesses.  By default
only the bio/block interface is used.  However, if another driver can
make effective use of the byte-aligned capability it can claim namespace
interface and use the byte-aligned ->rw_bytes() interface.

The BTT driver is the initial first consumer of this mechanism to allow
adding atomic sector update semantics to a pmem or blk namespace.  This
patch is the sysfs infrastructure to allow configuring a BTT instance
for a namespace.  Enabling that BTT and performing i/o is in a
subsequent patch.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2015-06-25 04:20:04 -04:00
parent 0ba1c63489
commit 8c2f7e8658
13 changed files with 879 additions and 99 deletions
Download patch file Download diff file Expand all files Collapse all files

63
include/linux/nd.h
View file

@ -12,6 +12,7 @@
*/
#ifndef __LINUX_ND_H__
#define __LINUX_ND_H__
#include <linux/fs.h>
#include <linux/ndctl.h>
#include <linux/device.h>
@ -28,13 +29,33 @@ static inline struct nd_device_driver *to_nd_device_driver(
return container_of(drv, struct nd_device_driver, drv);
};
/**
* struct nd_namespace_common - core infrastructure of a namespace
* @force_raw: ignore other personalities for the namespace (e.g. btt)
* @dev: device model node
* @claim: when set a another personality has taken ownership of the namespace
* @rw_bytes: access the raw namespace capacity with byte-aligned transfers
*/
struct nd_namespace_common {
int force_raw;
struct device dev;
struct device *claim;
int (*rw_bytes)(struct nd_namespace_common *, resource_size_t offset,
void *buf, size_t size, int rw);
};
static inline struct nd_namespace_common *to_ndns(struct device *dev)
{
return container_of(dev, struct nd_namespace_common, dev);
}
/**
* struct nd_namespace_io - infrastructure for loading an nd_pmem instance
* @dev: namespace device created by the nd region driver
* @res: struct resource conversion of a NFIT SPA table
*/
struct nd_namespace_io {
struct device dev;
struct nd_namespace_common common;
struct resource res;
};
@ -52,7 +73,6 @@ struct nd_namespace_pmem {
/**
* struct nd_namespace_blk - namespace for dimm-bounded persistent memory
* @dev: namespace device creation by the nd region driver
* @alt_name: namespace name supplied in the dimm label
* @uuid: namespace name supplied in the dimm label
* @id: ida allocated id
@ -61,7 +81,7 @@ struct nd_namespace_pmem {
* @res: discontiguous dpa extents for given dimm
*/
struct nd_namespace_blk {
struct device dev;
struct nd_namespace_common common;
char *alt_name;
u8 *uuid;
int id;
@ -72,7 +92,7 @@ struct nd_namespace_blk {
static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
{
return container_of(dev, struct nd_namespace_io, dev);
return container_of(dev, struct nd_namespace_io, common.dev);
}
static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
@ -84,7 +104,40 @@ static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
{
return container_of(dev, struct nd_namespace_blk, dev);
return container_of(dev, struct nd_namespace_blk, common.dev);
}
/**
* nvdimm_read_bytes() - synchronously read bytes from an nvdimm namespace
* @ndns: device to read
* @offset: namespace-relative starting offset
* @buf: buffer to fill
* @size: transfer length
*
* @buf is up-to-date upon return from this routine.
*/
static inline int nvdimm_read_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size)
{
return ndns->rw_bytes(ndns, offset, buf, size, READ);
}
/**
* nvdimm_write_bytes() - synchronously write bytes to an nvdimm namespace
* @ndns: device to read
* @offset: namespace-relative starting offset
* @buf: buffer to drain
* @size: transfer length
*
* NVDIMM Namepaces disks do not implement sectors internally. Depending on
* the @ndns, the contents of @buf may be in cpu cache, platform buffers,
* or on backing memory media upon return from this routine. Flushing
* to media is handled internal to the @ndns driver, if at all.
*/
static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
resource_size_t offset, void *buf, size_t size)
{
return ndns->rw_bytes(ndns, offset, buf, size, WRITE);
}
#define MODULE_ALIAS_ND_DEVICE(type) \