[PATCH] powerpc/scm: Mark the region volatile if cache flush not required
From: Aneesh Kumar K.V <hidden>
Date: 2019-06-07 06:46:22
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 <redacted> --- arch/powerpc/platforms/pseries/papr_scm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 96c53b23e58f..0176ce66673f 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c@@ -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);
--
2.21.0