From 338f6dac8585beaf4d913de8847e430808fb7596 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Tue, 24 Mar 2020 09:18:21 +0530 Subject: [PATCH] libnvdimm: Update persistence domain value for of_pmem and papr_scm device Currently, kernel shows the below values "persistence_domain":"cpu_cache" "persistence_domain":"memory_controller" "persistence_domain":"unknown" "cpu_cache" indicates no extra instructions is needed to ensure the persistence of data in the pmem media on power failure. "memory_controller" indicates cpu cache flush instructions are required to flush the data. Platform provides mechanisms to automatically flush outstanding write data from memory controler to pmem on system power loss. Based on the above use memory_controller for non volatile regions on ppc64. Signed-off-by: Aneesh Kumar K.V Link: https://lore.kernel.org/r/20200324034821.60869-1-aneesh.kumar@linux.ibm.com Signed-off-by: Dan Williams --- arch/powerpc/platforms/pseries/papr_scm.c | 4 +++- drivers/nvdimm/of_pmem.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 0b4467e378e5..922a4fc3b61b 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -361,8 +361,10 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p) if (p->is_volatile) p->region = nvdimm_volatile_region_create(p->bus, &ndr_desc); - else + else { + set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags); 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); diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c index 8224d1431ea9..6826a274a1f1 100644 --- a/drivers/nvdimm/of_pmem.c +++ b/drivers/nvdimm/of_pmem.c @@ -62,8 +62,10 @@ static int of_pmem_region_probe(struct platform_device *pdev) if (is_volatile) region = nvdimm_volatile_region_create(bus, &ndr_desc); - else + else { + set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags); region = nvdimm_pmem_region_create(bus, &ndr_desc); + } if (!region) dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n", -- GitLab