diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:20:04 -0400 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:20:04 -0400 |
| commit | 8c2f7e8658df1d3b7cbfa62706941d14c715823a (patch) | |
| tree | ac93512841113f4d1d7a38d788ec73bb21e2d605 /drivers/nvdimm/nd.h | |
| parent | 0ba1c634892b3590779803a701bcb82e8c32cc7a (diff) | |
libnvdimm: infrastructure for btt devices
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>
Diffstat (limited to 'drivers/nvdimm/nd.h')
| -rw-r--r-- | drivers/nvdimm/nd.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index bfa849617358..d13eccbb67e9 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -19,6 +19,10 @@ #include <linux/types.h> #include "label.h" +enum { + SECTOR_SHIFT = 9, +}; + struct nvdimm_drvdata { struct device *dev; int nsindex_size; @@ -74,7 +78,9 @@ static inline struct nd_namespace_index *to_next_namespace_index( struct nd_region { struct device dev; struct ida ns_ida; + struct ida btt_ida; struct device *ns_seed; + struct device *btt_seed; u16 ndr_mappings; u64 ndr_size; u64 ndr_start; @@ -94,6 +100,14 @@ static inline unsigned nd_inc_seq(unsigned seq) return next[seq & 3]; } +struct nd_btt { + struct device dev; + struct nd_namespace_common *ndns; + unsigned long lbasize; + u8 *uuid; + int id; +}; + enum nd_async_mode { ND_SYNC, ND_ASYNC, @@ -118,6 +132,30 @@ int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd); int nvdimm_init_config_data(struct nvdimm_drvdata *ndd); int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, void *buf, size_t len); +struct nd_btt *to_nd_btt(struct device *dev); +struct btt_sb; +u64 nd_btt_sb_checksum(struct btt_sb *btt_sb); +#if IS_ENABLED(CONFIG_BTT) +int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata); +bool is_nd_btt(struct device *dev); +struct device *nd_btt_create(struct nd_region *nd_region); +#else +static inline nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata) +{ + return -ENODEV; +} + +static inline bool is_nd_btt(struct device *dev) +{ + return false; +} + +static inline struct device *nd_btt_create(struct nd_region *nd_region) +{ + return NULL; +} + +#endif struct nd_region *to_nd_region(struct device *dev); int nd_region_to_nstype(struct nd_region *nd_region); int nd_region_register_namespaces(struct nd_region *nd_region, int *err); @@ -132,4 +170,6 @@ void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res); struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, struct nd_label_id *label_id, resource_size_t start, resource_size_t n); +resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns); +struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev); #endif /* __ND_H__ */ |