libnvdimm, pmem: adjust for section collisions with 'System RAM'
On a platform where 'Persistent Memory' and 'System RAM' are mixed
within a given sparsemem section, trim the namespace and notify about the
sub-optimal alignment.
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 9edf7eb..f5cb886 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -133,6 +133,7 @@
bool pmem_should_map_pages(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_namespace_io *nsio;
if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
return false;
@@ -143,6 +144,12 @@
if (is_nd_pfn(dev) || is_nd_btt(dev))
return false;
+ nsio = to_nd_namespace_io(dev);
+ if (region_intersects(nsio->res.start, resource_size(&nsio->res),
+ IORESOURCE_SYSTEM_RAM,
+ IORES_DESC_NONE) == REGION_MIXED)
+ return false;
+
#ifdef ARCH_MEMREMAP_PMEM
return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
#else