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authorDan Williams <dan.j.williams@intel.com>2019-01-25 04:33:06 +0300
committerDan Williams <dan.j.williams@intel.com>2019-02-12 21:48:14 +0300
commitfa7d2e639cd90442d868dfc6ca1d4cc9d8bf206e (patch)
tree0328b374c2d676b6756d4ae834841f094ab26c6b /drivers/nvdimm
parent11a358109e0c48fa74f27e750dde4d25de4d5fc3 (diff)
downloadlinux-fa7d2e639cd90442d868dfc6ca1d4cc9d8bf206e.tar.xz
libnvdimm/pmem: Honor force_raw for legacy pmem regions
For recovery, where non-dax access is needed to a given physical address range, and testing, allow the 'force_raw' attribute to override the default establishment of a dev_pagemap. Otherwise without this capability it is possible to end up with a namespace that can not be activated due to corrupted info-block, and one that can not be repaired due to a section collision. Cc: <stable@vger.kernel.org> Fixes: 004f1afbe199 ("libnvdimm, pmem: direct map legacy pmem by default") Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/namespace_devs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 4b077555ac70..33a3b23b3db7 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -138,6 +138,7 @@ bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
bool pmem_should_map_pages(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
+ struct nd_namespace_common *ndns = to_ndns(dev);
struct nd_namespace_io *nsio;
if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
@@ -149,6 +150,9 @@ bool pmem_should_map_pages(struct device *dev)
if (is_nd_pfn(dev) || is_nd_btt(dev))
return false;
+ if (ndns->force_raw)
+ return false;
+
nsio = to_nd_namespace_io(dev);
if (region_intersects(nsio->res.start, resource_size(&nsio->res),
IORESOURCE_SYSTEM_RAM,