summaryrefslogtreecommitdiff
path: root/drivers/nvdimm/dimm_devs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/nvdimm/dimm_devs.c')
-rw-r--r--drivers/nvdimm/dimm_devs.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 8d348b22ba45..863cabc35215 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -537,6 +537,37 @@ resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
}
/**
+ * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
+ * contiguous unallocated dpa range.
+ * @nd_region: constrain available space check to this reference region
+ * @nd_mapping: container of dpa-resource-root + labels
+ */
+resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping)
+{
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nvdimm_bus *nvdimm_bus;
+ resource_size_t max = 0;
+ struct resource *res;
+
+ /* if a dimm is disabled the available capacity is zero */
+ if (!ndd)
+ return 0;
+
+ nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
+ if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
+ return 0;
+ for_each_dpa_resource(ndd, res) {
+ if (strcmp(res->name, "pmem-reserve") != 0)
+ continue;
+ if (resource_size(res) > max)
+ max = resource_size(res);
+ }
+ release_free_pmem(nvdimm_bus, nd_mapping);
+ return max;
+}
+
+/**
* nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
* @nd_mapping: container of dpa-resource-root + labels
* @nd_region: constrain available space check to this reference region