Commit e6dfb2de authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm, nfit: dimm/memory-devices 



Enable nvdimm devices to be registered on a nvdimm_bus.  The kernel
assigned device id for nvdimm devicesis dynamic.  If userspace needs a
more static identifier it should consult a provider-specific attribute.
In the case where NFIT is the provider, the 'nmemX/nfit/handle' or
'nmemX/nfit/serial' attributes may be used for this purpose.

Cc: Neil Brown <neilb@suse.de>
Cc: <linux-acpi@vger.kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Robert Moore <robert.moore@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: default avatarToshi Kani <toshi.kani@hp.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 45def22c

drivers/acpi/nfit.c

+160 −1
Original line number Diff line number Diff line
@@ -381,6 +381,165 @@ static const struct attribute_group *acpi_nfit_attribute_groups[] = { 
	NULL,

};



static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)

{

	struct nvdimm *nvdimm = to_nvdimm(dev);

	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);



	return __to_nfit_memdev(nfit_mem);

}



static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)

{

	struct nvdimm *nvdimm = to_nvdimm(dev);

	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);



	return nfit_mem->dcr;

}



static ssize_t handle_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);



	return sprintf(buf, "%#x\n", memdev->device_handle);

}

static DEVICE_ATTR_RO(handle);



static ssize_t phys_id_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);



	return sprintf(buf, "%#x\n", memdev->physical_id);

}

static DEVICE_ATTR_RO(phys_id);



static ssize_t vendor_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);



	return sprintf(buf, "%#x\n", dcr->vendor_id);

}

static DEVICE_ATTR_RO(vendor);



static ssize_t rev_id_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);



	return sprintf(buf, "%#x\n", dcr->revision_id);

}

static DEVICE_ATTR_RO(rev_id);



static ssize_t device_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);



	return sprintf(buf, "%#x\n", dcr->device_id);

}

static DEVICE_ATTR_RO(device);



static ssize_t format_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);



	return sprintf(buf, "%#x\n", dcr->code);

}

static DEVICE_ATTR_RO(format);



static ssize_t serial_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);



	return sprintf(buf, "%#x\n", dcr->serial_number);

}

static DEVICE_ATTR_RO(serial);



static struct attribute *acpi_nfit_dimm_attributes[] = {

	&dev_attr_handle.attr,

	&dev_attr_phys_id.attr,

	&dev_attr_vendor.attr,

	&dev_attr_device.attr,

	&dev_attr_format.attr,

	&dev_attr_serial.attr,

	&dev_attr_rev_id.attr,

	NULL,

};



static umode_t acpi_nfit_dimm_attr_visible(struct kobject *kobj,

		struct attribute *a, int n)

{

	struct device *dev = container_of(kobj, struct device, kobj);



	if (to_nfit_dcr(dev))

		return a->mode;

	else

		return 0;

}



static struct attribute_group acpi_nfit_dimm_attribute_group = {

	.name = "nfit",

	.attrs = acpi_nfit_dimm_attributes,

	.is_visible = acpi_nfit_dimm_attr_visible,

};



static const struct attribute_group *acpi_nfit_dimm_attribute_groups[] = {

	&acpi_nfit_dimm_attribute_group,

	NULL,

};



static struct nvdimm *acpi_nfit_dimm_by_handle(struct acpi_nfit_desc *acpi_desc,

		u32 device_handle)

{

	struct nfit_mem *nfit_mem;



	list_for_each_entry(nfit_mem, &acpi_desc->dimms, list)

		if (__to_nfit_memdev(nfit_mem)->device_handle == device_handle)

			return nfit_mem->nvdimm;



	return NULL;

}



static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)

{

	struct nfit_mem *nfit_mem;



	list_for_each_entry(nfit_mem, &acpi_desc->dimms, list) {

		struct nvdimm *nvdimm;

		unsigned long flags = 0;

		u32 device_handle;



		device_handle = __to_nfit_memdev(nfit_mem)->device_handle;

		nvdimm = acpi_nfit_dimm_by_handle(acpi_desc, device_handle);

		if (nvdimm) {

			/*

			 * If for some reason we find multiple DCRs the

			 * first one wins

			 */

			dev_err(acpi_desc->dev, "duplicate DCR detected: %s\n",

					nvdimm_name(nvdimm));

			continue;

		}



		if (nfit_mem->bdw && nfit_mem->memdev_pmem)

			flags |= NDD_ALIASING;



		nvdimm = nvdimm_create(acpi_desc->nvdimm_bus, nfit_mem,

				acpi_nfit_dimm_attribute_groups, flags);

		if (!nvdimm)

			return -ENOMEM;



		nfit_mem->nvdimm = nvdimm;

	}



	return 0;

}



static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz)

{

	struct device *dev = acpi_desc->dev;
@@ -408,7 +567,7 @@ static int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, acpi_size sz) 
	if (nfit_mem_init(acpi_desc) != 0)

		return -ENOMEM;



	return 0;

	return acpi_nfit_register_dimms(acpi_desc);

}



static int acpi_nfit_add(struct acpi_device *adev)

drivers/acpi/nfit.h

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ struct nfit_memdev { 


/* assembled tables for a given dimm/memory-device */

struct nfit_mem {

	struct nvdimm *nvdimm;

	struct acpi_nfit_memory_map *memdev_dcr;

	struct acpi_nfit_memory_map *memdev_pmem;

	struct acpi_nfit_control_region *dcr;

drivers/nvdimm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,3 +2,4 @@ obj-$(CONFIG_LIBNVDIMM) += libnvdimm.o 


libnvdimm-y := core.o

libnvdimm-y += bus.o

libnvdimm-y += dimm_devs.o

drivers/nvdimm/bus.c

+13 −1
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/uaccess.h>

#include <linux/fcntl.h>

#include <linux/async.h>

#include <linux/slab.h>

#include <linux/fs.h>

#include <linux/io.h>
@@ -21,6 +22,10 @@ 
static int nvdimm_bus_major;

static struct class *nd_class;



struct bus_type nvdimm_bus_type = {

	.name = "nd",

};



int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)

{

	dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
@@ -59,9 +64,13 @@ int __init nvdimm_bus_init(void) 
{

	int rc;



	rc = bus_register(&nvdimm_bus_type);

	if (rc)

		return rc;



	rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);

	if (rc < 0)

		return rc;

		goto err_chrdev;

	nvdimm_bus_major = rc;



	nd_class = class_create(THIS_MODULE, "nd");
@@ -72,6 +81,8 @@ int __init nvdimm_bus_init(void) 


 err_class:

	unregister_chrdev(nvdimm_bus_major, "ndctl");

 err_chrdev:

	bus_unregister(&nvdimm_bus_type);



	return rc;

}
@@ -80,4 +91,5 @@ void __exit nvdimm_bus_exit(void) 
{

	class_destroy(nd_class);

	unregister_chrdev(nvdimm_bus_major, "ndctl");

	bus_unregister(&nvdimm_bus_type);

}

drivers/nvdimm/core.c

+31 −2
Original line number Diff line number Diff line
@@ -18,8 +18,8 @@ 
#include <linux/slab.h>

#include "nd-core.h"



static LIST_HEAD(nvdimm_bus_list);

static DEFINE_MUTEX(nvdimm_bus_list_mutex);

LIST_HEAD(nvdimm_bus_list);

DEFINE_MUTEX(nvdimm_bus_list_mutex);

static DEFINE_IDA(nd_ida);



static void nvdimm_bus_release(struct device *dev)
@@ -48,6 +48,19 @@ struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus) 
}

EXPORT_SYMBOL_GPL(to_nd_desc);



struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)

{

	struct device *dev;



	for (dev = nd_dev; dev; dev = dev->parent)

		if (dev->release == nvdimm_bus_release)

			break;

	dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");

	if (dev)

		return to_nvdimm_bus(dev);

	return NULL;

}



static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)

{

	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
@@ -121,6 +134,21 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent, 
}

EXPORT_SYMBOL_GPL(nvdimm_bus_register);



static int child_unregister(struct device *dev, void *data)

{

	/*

	 * the singular ndctl class device per bus needs to be

	 * "device_destroy"ed, so skip it here

	 *

	 * i.e. remove classless children

	 */

	if (dev->class)

		/* pass */;

	else

		device_unregister(dev);

	return 0;

}



void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)

{

	if (!nvdimm_bus)
@@ -130,6 +158,7 @@ void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) 
	list_del_init(&nvdimm_bus->list);

	mutex_unlock(&nvdimm_bus_list_mutex);



	device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);

	nvdimm_bus_destroy_ndctl(nvdimm_bus);



	device_unregister(&nvdimm_bus->dev);

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