drivers/dax/hmem.c

   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");