drivers/nvdimm/dax_devs.c

Source file repositories/reference/linux-study-clean/drivers/nvdimm/dax_devs.c

File Facts

System
Linux kernel
Corpus path
drivers/nvdimm/dax_devs.c
Extension
.c
Size
2821 bytes
Lines
127
Domain
Driver Families
Bucket
drivers/nvdimm
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
 */
#include <linux/device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include "nd-core.h"
#include "pfn.h"
#include "nd.h"

static void nd_dax_release(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
	struct nd_dax *nd_dax = to_nd_dax(dev);
	struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;

	dev_dbg(dev, "trace\n");
	nd_detach_ndns(dev, &nd_pfn->ndns);
	ida_free(&nd_region->dax_ida, nd_pfn->id);
	kfree(nd_pfn->uuid);
	kfree(nd_dax);
}

struct nd_dax *to_nd_dax(struct device *dev)
{
	struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev);

	WARN_ON(!is_nd_dax(dev));
	return nd_dax;
}
EXPORT_SYMBOL(to_nd_dax);

static const struct device_type nd_dax_device_type = {
	.name = "nd_dax",
	.release = nd_dax_release,
	.groups = nd_pfn_attribute_groups,
};

bool is_nd_dax(const struct device *dev)
{
	return dev ? dev->type == &nd_dax_device_type : false;
}
EXPORT_SYMBOL(is_nd_dax);

static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
{
	struct nd_pfn *nd_pfn;
	struct nd_dax *nd_dax;
	struct device *dev;

	nd_dax = kzalloc_obj(*nd_dax);
	if (!nd_dax)
		return NULL;

	nd_pfn = &nd_dax->nd_pfn;
	nd_pfn->id = ida_alloc(&nd_region->dax_ida, GFP_KERNEL);
	if (nd_pfn->id < 0) {
		kfree(nd_dax);
		return NULL;
	}

	dev = &nd_pfn->dev;
	dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id);
	dev->type = &nd_dax_device_type;
	dev->parent = &nd_region->dev;

	return nd_dax;
}

struct device *nd_dax_create(struct nd_region *nd_region)
{
	struct device *dev = NULL;
	struct nd_dax *nd_dax;

	if (!is_memory(&nd_region->dev))
		return NULL;

	nd_dax = nd_dax_alloc(nd_region);
	if (nd_dax)
		dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL);
	nd_device_register(dev);
	return dev;
}

int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
{
	int rc;
	struct nd_dax *nd_dax;

Annotation

Implementation Notes