libnvdimm: allow a platform to force enable label support (42237e39) · Commits · 戴 / test

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:

Dan Williams <dan.j.williams@intel.com>

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 {

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