Dan Williams | a6c7f4c | 2019-11-06 17:43:43 -0800 | [diff] [blame] | 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 | |
| 8 | static 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 | |
| 38 | static int dax_hmem_remove(struct platform_device *pdev) |
| 39 | { |
| 40 | /* devm handles teardown */ |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | static struct platform_driver dax_hmem_driver = { |
| 45 | .probe = dax_hmem_probe, |
| 46 | .remove = dax_hmem_remove, |
| 47 | .driver = { |
| 48 | .name = "hmem", |
| 49 | }, |
| 50 | }; |
| 51 | |
| 52 | module_platform_driver(dax_hmem_driver); |
| 53 | |
| 54 | MODULE_ALIAS("platform:hmem*"); |
| 55 | MODULE_LICENSE("GPL v2"); |
| 56 | MODULE_AUTHOR("Intel Corporation"); |