From 96c3a239054a367d1a18581384985ab9e97c5ce7 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Wed, 31 Jan 2018 12:45:49 -0700 Subject: [PATCH] libnvdimm: expose platform persistence attribute for nd_region Providing a sysfs attribute for nd_region that shows the persistence capabilities for the platform. Signed-off-by: Dave Jiang Reviewed-by: Ross Zwisler Signed-off-by: Ross Zwisler --- drivers/nvdimm/region_devs.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index abaf38c61220..e6d01911e092 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -528,6 +528,18 @@ static ssize_t resource_show(struct device *dev, } static DEVICE_ATTR_RO(resource); +static ssize_t persistence_domain_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_region *nd_region = to_nd_region(dev); + unsigned long flags = nd_region->flags; + + return sprintf(buf, "%s%s\n", + flags & BIT(ND_REGION_PERSIST_CACHE) ? "cpu_cache " : "", + flags & BIT(ND_REGION_PERSIST_MEMCTRL) ? "memory_controller " : ""); +} +static DEVICE_ATTR_RO(persistence_domain); + static struct attribute *nd_region_attributes[] = { &dev_attr_size.attr, &dev_attr_nstype.attr, @@ -543,6 +555,7 @@ static struct attribute *nd_region_attributes[] = { &dev_attr_init_namespaces.attr, &dev_attr_badblocks.attr, &dev_attr_resource.attr, + &dev_attr_persistence_domain.attr, NULL, };