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libnvdimm: allow a platform to force enable label support

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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>
This commit is contained in:
Dan Williams 2016-10-15 15:33:52 -07:00
parent 8d7c22ac0c
commit 42237e393f
3 changed files with 10 additions and 0 deletions
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2
drivers/nvdimm/dimm.c
View File

@ -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)

7
drivers/nvdimm/dimm_devs.c
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@ -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);

1
drivers/nvdimm/nd.h
View File

@ -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 {