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| author | Dan Williams <dan.j.williams@intel.com> | 2015-08-01 08:16:37 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-08-29 05:40:04 +0200 |
| commit | 32ab0a3f51701cb37ab960635254d5f84ec3de0a (patch) | |
| tree | 5e6ff1b400f4f1c42c7aecc76234f007d70e6a25 /drivers/nvdimm/nd.h | |
| parent | libnvdimm, pfn: 'struct page' provider infrastructure (diff) | |
| download | linux-32ab0a3f51701cb37ab960635254d5f84ec3de0a.tar.xz linux-32ab0a3f51701cb37ab960635254d5f84ec3de0a.zip | |
libnvdimm, pmem: 'struct page' for pmem
Enable the pmem driver to handle PFN device instances. Attaching a pmem
namespace to a pfn device triggers the driver to allocate and initialize
struct page entries for pmem. Memory capacity for this allocation comes
exclusively from RAM for now which is suitable for low PMEM to RAM
ratios. This mechanism will be expanded later for setting an "allocate
from PMEM" policy.
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Christoph Hellwig <hch@lst.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 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h index 8da2be1cecb8..83e5d0935012 100644 --- a/drivers/nvdimm/nd.h +++ b/drivers/nvdimm/nd.h @@ -217,6 +217,7 @@ struct nd_pfn *to_nd_pfn(struct device *dev); int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata); bool is_nd_pfn(struct device *dev); struct device *nd_pfn_create(struct nd_region *nd_region); +int nd_pfn_validate(struct nd_pfn *nd_pfn); #else static inline int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata) { @@ -232,6 +233,11 @@ static inline struct device *nd_pfn_create(struct nd_region *nd_region) { return NULL; } + +static inline int nd_pfn_validate(struct nd_pfn *nd_pfn) +{ + return -ENODEV; +} #endif struct nd_region *to_nd_region(struct device *dev); |