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powerpc/pseries/scm: Mark the region volatile if cache flush not required 

The device tree node is documented as below:

  “ibm,cache-flush-required”:
  property name indicates Cache Flush Required for this Persistent Memory Segment to persist memory
  prop-encoded-array: None, this is a name only property.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2019-06-07 12:14:07 +05:30 committed by Michael Ellerman
parent c0b1b23b9c
commit 2a0ffbd478
1 changed files with 7 additions and 1 deletions
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8
arch/powerpc/platforms/pseries/papr_scm.c
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@ -28,6 +28,7 @@ struct papr_scm_priv {
uint64_t blocks;
uint64_t block_size;
int metadata_size;
bool is_volatile;
uint64_t bound_addr;
@ -248,7 +249,10 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
ndr_desc.nd_set = &p->nd_set;
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
p->region = nvdimm_pmem_region_create(p->bus, &ndr_desc);
if (p->is_volatile)
p->region = nvdimm_volatile_region_create(p->bus, &ndr_desc);
else
p->region = nvdimm_pmem_region_create(p->bus, &ndr_desc);
if (!p->region) {
dev_err(dev, "Error registering region %pR from %pOF\n",
ndr_desc.res, p->dn);
@ -293,6 +297,7 @@ static int papr_scm_probe(struct platform_device *pdev)
return -ENODEV;
}
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
@ -304,6 +309,7 @@ static int papr_scm_probe(struct platform_device *pdev)
p->drc_index = drc_index;
p->block_size = block_size;
p->blocks = blocks;
p->is_volatile = !of_property_read_bool(dn, "ibm,cache-flush-required");
/* We just need to ensure that set cookies are unique across */
uuid_parse(uuid_str, (uuid_t *) uuid);