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| author | Dan Williams <dan.j.williams@intel.com> | 2015-05-01 20:11:27 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2015-06-25 04:24:10 +0300 |
| commit | eaf961536e1622ad21247ac8d44acd48ba65566e (patch) | |
| tree | 479b1d2f81f9f8cc9abf99fa8f9b6496cbc88a25 /include/linux/libnvdimm.h | |
| parent | 9f53f9fa4ad1d8bddd4d14359cdabc531aedffe8 (diff) | |
| download | linux-eaf961536e1622ad21247ac8d44acd48ba65566e.tar.xz | |
libnvdimm, nfit: add interleave-set state-tracking infrastructure
On platforms that have firmware support for reading/writing per-dimm
label space, a portion of the dimm may be accessible via an interleave
set PMEM mapping in addition to the dimm's BLK (block-data-window
aperture(s)) interface. A label, stored in a "configuration data
region" on the dimm, disambiguates which dimm addresses are accessed
through which exclusive interface.
Add infrastructure that allows the kernel to block modifications to a
label in the set while any member dimm is active. Note that this is
meant only for enforcing "no modifications of active labels" via the
coarse ioctl command. Adding/deleting namespaces from an active
interleave set is always possible via sysfs.
Another aspect of tracking interleave sets is tracking their integrity
when DIMMs in a set are physically re-ordered. For this purpose we
generate an "interleave-set cookie" that can be recorded in a label and
validated against the current configuration. It is the bus provider
implementation's responsibility to calculate the interleave set cookie
and attach it to a given region.
Cc: Neil Brown <neilb@suse.de>
Cc: <linux-acpi@vger.kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/libnvdimm.h')
| -rw-r--r-- | include/linux/libnvdimm.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index 37f966aff386..1b627b109360 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -61,11 +61,16 @@ struct nd_cmd_desc { int out_sizes[ND_CMD_MAX_ELEM]; }; +struct nd_interleave_set { + u64 cookie; +}; + struct nd_region_desc { struct resource *res; struct nd_mapping *nd_mapping; u16 num_mappings; const struct attribute_group **attr_groups; + struct nd_interleave_set *nd_set; void *provider_data; }; @@ -101,4 +106,5 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus, struct nd_region_desc *ndr_desc); struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, struct nd_region_desc *ndr_desc); +u64 nd_fletcher64(void *addr, size_t len, bool le); #endif /* __LIBNVDIMM_H__ */ |