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Note: File does not exist in v5.4.
 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/platform_device.h>
 3#include <linux/memregion.h>
 4#include <linux/module.h>
 5#include <linux/pfn_t.h>
 6#include "bus.h"
 7
 8static int dax_hmem_probe(struct platform_device *pdev)
 9{
10	struct device *dev = &pdev->dev;
11	struct dev_pagemap pgmap = { };
12	struct dax_region *dax_region;
13	struct memregion_info *mri;
14	struct dev_dax *dev_dax;
15	struct resource *res;
16
17	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
18	if (!res)
19		return -ENOMEM;
20
21	mri = dev->platform_data;
22	memcpy(&pgmap.res, res, sizeof(*res));
23
24	dax_region = alloc_dax_region(dev, pdev->id, res, mri->target_node,
25			PMD_SIZE, PFN_DEV|PFN_MAP);
26	if (!dax_region)
27		return -ENOMEM;
28
29	dev_dax = devm_create_dev_dax(dax_region, 0, &pgmap);
30	if (IS_ERR(dev_dax))
31		return PTR_ERR(dev_dax);
32
33	/* child dev_dax instances now own the lifetime of the dax_region */
34	dax_region_put(dax_region);
35	return 0;
36}
37
38static int dax_hmem_remove(struct platform_device *pdev)
39{
40	/* devm handles teardown */
41	return 0;
42}
43
44static struct platform_driver dax_hmem_driver = {
45	.probe = dax_hmem_probe,
46	.remove = dax_hmem_remove,
47	.driver = {
48		.name = "hmem",
49	},
50};
51
52module_platform_driver(dax_hmem_driver);
53
54MODULE_ALIAS("platform:hmem*");
55MODULE_LICENSE("GPL v2");
56MODULE_AUTHOR("Intel Corporation");