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Commit f6ed58c7 authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm, pfn: 'resource'-address and 'size' attributes for pfn devices 



Currenty with a raw mode pmem namespace the physical memory address range for
the device can be obtained via /sys/block/pmemX/device/{resource|size}.  Add
similar attributes for pfn instances that takes the struct page memmap and
section padding into account.

Reported-by: default avatarHaozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent cfe30b87

drivers/nvdimm/pfn_devs.c

+56 −0
Original line number Diff line number Diff line
@@ -205,11 +205,67 @@ static ssize_t namespace_store(struct device *dev, 
}

static DEVICE_ATTR_RW(namespace);



static ssize_t resource_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct nd_pfn *nd_pfn = to_nd_pfn(dev);

	ssize_t rc;



	device_lock(dev);

	if (dev->driver) {

		struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;

		u64 offset = __le64_to_cpu(pfn_sb->dataoff);

		struct nd_namespace_common *ndns = nd_pfn->ndns;

		u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);

		struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);



		rc = sprintf(buf, "%#llx\n", (unsigned long long) nsio->res.start

				+ start_pad + offset);

	} else {

		/* no address to convey if the pfn instance is disabled */

		rc = -ENXIO;

	}

	device_unlock(dev);



	return rc;

}

static DEVICE_ATTR_RO(resource);



static ssize_t size_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct nd_pfn *nd_pfn = to_nd_pfn(dev);

	ssize_t rc;



	device_lock(dev);

	if (dev->driver) {

		struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;

		u64 offset = __le64_to_cpu(pfn_sb->dataoff);

		struct nd_namespace_common *ndns = nd_pfn->ndns;

		u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);

		u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);

		struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);



		rc = sprintf(buf, "%llu\n", (unsigned long long)

				resource_size(&nsio->res) - start_pad

				- end_trunc - offset);

	} else {

		/* no size to convey if the pfn instance is disabled */

		rc = -ENXIO;

	}

	device_unlock(dev);



	return rc;

}

static DEVICE_ATTR_RO(size);



static struct attribute *nd_pfn_attributes[] = {

	&dev_attr_mode.attr,

	&dev_attr_namespace.attr,

	&dev_attr_uuid.attr,

	&dev_attr_align.attr,

	&dev_attr_resource.attr,

	&dev_attr_size.attr,

	NULL,

};