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libnvdimm: handle locked label storage areas 

Per the latest version of the "NVDIMM DSM Interface Example" [1], the
label data retrieval routine can report a "locked" status. In this case
all regions associated with that DIMM are disabled until the label area
is unlocked. Provide generic libnvdimm enabling for NVDIMMs with label
data area locking capabilities.

[1]: http://pmem.io/documents/

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-05-04 11:47:22 -07:00
parent 8f078b38dd
commit 9d62ed9651
5 changed files with 39 additions and 10 deletions
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21
drivers/acpi/nfit/core.c
View File

@ -184,14 +184,29 @@ static int xlat_bus_status(void *buf, unsigned int cmd, u32 status)
return 0;
}
static int xlat_nvdimm_status(void *buf, unsigned int cmd, u32 status)
{
switch (cmd) {
case ND_CMD_GET_CONFIG_SIZE:
if (status >> 16 & ND_CONFIG_LOCKED)
return -EACCES;
break;
default:
break;
}
/* all other non-zero status results in an error */
if (status)
return -EIO;
return 0;
}
static int xlat_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
u32 status)
{
if (!nvdimm)
return xlat_bus_status(buf, cmd, status);
if (status)
return -EIO;
return 0;
return xlat_nvdimm_status(buf, cmd, status);
}
int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,

2
drivers/nvdimm/dimm.c
View File

@ -49,6 +49,8 @@ static int nvdimm_probe(struct device *dev)
kref_init(&ndd->kref);
rc = nvdimm_init_nsarea(ndd);
if (rc == -EACCES)
nvdimm_set_locked(dev);
if (rc)
goto err;

8
drivers/nvdimm/dimm_devs.c
View File

@ -67,6 +67,7 @@ int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
struct nvdimm_bus_descriptor *nd_desc;
int rc = validate_dimm(ndd);
int cmd_rc = 0;
if (rc)
return rc;
@ -76,8 +77,11 @@ int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
memset(cmd, 0, sizeof(*cmd));
nd_desc = nvdimm_bus->nd_desc;
return nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), NULL);
rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
if (rc < 0)
return rc;
return cmd_rc;
}
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)

17
drivers/nvdimm/namespace_devs.c
View File

@ -2236,14 +2236,21 @@ static int init_active_labels(struct nd_region *nd_region)
int count, j;
/*
* If the dimm is disabled then prevent the region from
* being activated if it aliases DPA.
* If the dimm is disabled then we may need to prevent
* the region from being activated.
*/
if (!ndd) {
if (!test_bit(NDD_ALIASING, &nvdimm->flags))
if (test_bit(NDD_LOCKED, &nvdimm->flags))
/* fail, label data may be unreadable */;
else if (test_bit(NDD_ALIASING, &nvdimm->flags))
/* fail, labels needed to disambiguate dpa */;
else
return 0;
dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
dev_name(&nd_mapping->nvdimm->dev));
dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
dev_name(&nd_mapping->nvdimm->dev),
test_bit(NDD_LOCKED, &nvdimm->flags)
? "locked" : "disabled");
return -ENXIO;
}
nd_mapping->ndd = ndd;

1
include/uapi/linux/ndctl.h
View File

@ -169,6 +169,7 @@ enum {
enum {
ND_ARS_VOLATILE = 1,
ND_ARS_PERSISTENT = 2,
ND_CONFIG_LOCKED = 1,
};
static inline const char *nvdimm_bus_cmd_name(unsigned cmd)