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libnvdimm, pmem: adjust for section collisions with 'System RAM'

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On a platform where 'Persistent Memory' and 'System RAM' are mixed
within a given sparsemem section, trim the namespace and notify about the
sub-optimal alignment.

Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2016-03-03 09:38:00 -08:00
parent d9cbe09d39
commit cfe30b8720
4 changed files with 111 additions and 36 deletions
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10
drivers/nvdimm/pfn.h
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@@ -27,10 +27,13 @@ struct nd_pfn_sb {
__le32 flags;
__le16 version_major;
__le16 version_minor;
__le64 dataoff;
__le64 dataoff; /* relative to namespace_base + start_pad */
__le64 npfns;
__le32 mode;
u8 padding[4012];
/* minor-version-1 additions for section alignment */
__le32 start_pad;
__le32 end_trunc;
u8 padding[4004];
__le64 checksum;
};
@@ -45,4 +48,7 @@ struct nd_pfn_sb {
#define PFN_SECTION_ALIGN_DOWN(x) (x)
#define PFN_SECTION_ALIGN_UP(x) (x)
#endif
#define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
#define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
#endif /* __NVDIMM_PFN_H */