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Commit 42237e39 authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm: allow a platform to force enable label support 



Platforms like QEMU-KVM implement an NFIT table and label DSMs.
However, since that environment does not define an aliased
configuration, the labels are currently ignored and the kernel registers
a single full-sized pmem-namespace per region. Now that the kernel
supports sub-divisions of pmem regions the labels have a purpose.
Arrange for the labels to be honored when we find an existing / valid
namespace index block.

Cc: <qemu-devel@nongnu.org>
Cc: Haozhong Zhang <haozhong.zhang@intel.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 8d7c22ac

drivers/nvdimm/dimm.c

+2 −0
Original line number Diff line number Diff line
@@ -64,6 +64,8 @@ static int nvdimm_probe(struct device *dev) 
	nd_label_copy(ndd, to_next_namespace_index(ndd),

			to_current_namespace_index(ndd));

	rc = nd_label_reserve_dpa(ndd);

	if (ndd->ns_current >= 0)

		nvdimm_set_aliasing(dev);

	nvdimm_bus_unlock(dev);



	if (rc)

drivers/nvdimm/dimm_devs.c

+7 −0
Original line number Diff line number Diff line
@@ -184,6 +184,13 @@ int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, 
	return rc;

}



void nvdimm_set_aliasing(struct device *dev)

{

	struct nvdimm *nvdimm = to_nvdimm(dev);



	nvdimm->flags |= NDD_ALIASING;

}



static void nvdimm_release(struct device *dev)

{

	struct nvdimm *nvdimm = to_nvdimm(dev);

drivers/nvdimm/nd.h

+1 −0
Original line number Diff line number Diff line
@@ -238,6 +238,7 @@ int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, 
		void *buf, size_t len);

long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,

		unsigned int len);

void nvdimm_set_aliasing(struct device *dev);

struct nd_btt *to_nd_btt(struct device *dev);



struct nd_gen_sb {