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libnvdimm: control character device and nvdimm_bus sysfs attributes

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The control device for a nvdimm_bus is registered as an "nd" class
device.  The expectation is that there will usually only be one "nd" bus
registered under /sys/class/nd.  However, we allow for the possibility
of multiple buses and they will listed in discovery order as
ndctl0...ndctlN.  This character device hosts the ioctl for passing
control messages.  The initial command set has a 1:1 correlation with
the commands listed in the by the "NFIT DSM Example" document [1], but
this scheme is extensible to future command sets.

Note, nd_ioctl() and the backing ->ndctl() implementation are defined in
a subsequent patch.  This is simply the initial registrations and sysfs
attributes.

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

Cc: Neil Brown <[email protected]>
Cc: Greg KH <[email protected]>
Cc: <[email protected]>
Cc: Robert Moore <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Tested-by: Toshi Kani <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2015-04-26 19:26:48 -04:00
commit 45def22c1f
7 changed files with 215 additions and 3 deletions
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28
drivers/acpi/nfit.c
View file

@ -354,6 +354,33 @@ static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
return 0;
}
static ssize_t revision_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
return sprintf(buf, "%d\n", acpi_desc->nfit->header.revision);
}
static DEVICE_ATTR_RO(revision);
static struct attribute *acpi_nfit_attributes[] = {
&dev_attr_revision.attr,
NULL,
};
static struct attribute_group acpi_nfit_attribute_group = {
.name = "nfit",
.attrs = acpi_nfit_attributes,
};
static const struct attribute_group *acpi_nfit_attribute_groups[] = {
&nvdimm_bus_attribute_group,
&acpi_nfit_attribute_group,
NULL,
};
static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)
{
struct device *dev = acpi_desc->dev;
@ -410,6 +437,7 @@ static int acpi_nfit_add(struct acpi_device *adev)
nd_desc = &acpi_desc->nd_desc;
nd_desc->provider_name = "ACPI.NFIT";
nd_desc->ndctl = acpi_nfit_ctl;
nd_desc->attr_groups = acpi_nfit_attribute_groups;
acpi_desc->nvdimm_bus = nvdimm_bus_register(dev, nd_desc);
if (!acpi_desc->nvdimm_bus)

6
drivers/acpi/nfit.h
View file

@ -87,4 +87,10 @@ static inline struct acpi_nfit_memory_map *__to_nfit_memdev(
return nfit_mem->memdev_dcr;
return nfit_mem->memdev_pmem;
}
static inline struct acpi_nfit_desc *to_acpi_desc(
struct nvdimm_bus_descriptor *nd_desc)
{
return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);
}
#endif /* __NFIT_H__ */