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authorDan Williams <dan.j.williams@intel.com>2015-05-01 13:11:27 -0400
committerDan Williams <dan.j.williams@intel.com>2015-06-24 21:24:10 -0400
commiteaf961536e1622ad21247ac8d44acd48ba65566e (patch)
tree479b1d2f81f9f8cc9abf99fa8f9b6496cbc88a25 /include/linux/libnvdimm.h
parent9f53f9fa4ad1d8bddd4d14359cdabc531aedffe8 (diff)
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.h6
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__ */