drivers/dax/cxl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright(c) 2023 Intel Corporation. All rights reserved. */
   3 #include <linux/module.h>
   4 #include <linux/dax.h>
   5
   6 #include "../cxl/cxl.h"
   7 #include "bus.h"
   8
   9 static int cxl_dax_region_probe(struct device *dev)
  10 {
  11         struct cxl_dax_region *cxlr_dax = to_cxl_dax_region(dev);
  12         int nid = phys_to_target_node(cxlr_dax->hpa_range.start);
  13         struct cxl_region *cxlr = cxlr_dax->cxlr;
  14         struct dax_region *dax_region;
  15         struct dev_dax_data data;
  16
  17         if (nid == NUMA_NO_NODE)
  18                 nid = memory_add_physaddr_to_nid(cxlr_dax->hpa_range.start);
  19
  20         dax_region = alloc_dax_region(dev, cxlr->id, &cxlr_dax->hpa_range, nid,
  21                                       PMD_SIZE, IORESOURCE_DAX_KMEM);
  22         if (!dax_region)
  23                 return -ENOMEM;
  24
  25         data = (struct dev_dax_data) {
  26                 .dax_region = dax_region,
  27                 .id = -1,
  28                 .size = range_len(&cxlr_dax->hpa_range),
  29                 .memmap_on_memory = true,
  30         };
  31
  32         return PTR_ERR_OR_ZERO(devm_create_dev_dax(&data));
  33 }
  34
  35 static struct cxl_driver cxl_dax_region_driver = {
  36         .name = "cxl_dax_region",
  37         .probe = cxl_dax_region_probe,
  38         .id = CXL_DEVICE_DAX_REGION,
  39         .drv = {
  40                 .suppress_bind_attrs = true,
  41         },
  42 };
  43
  44 module_cxl_driver(cxl_dax_region_driver);
  45 MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION);
  46 MODULE_DESCRIPTION("CXL DAX: direct access to CXL regions");
  47 MODULE_LICENSE("GPL");
  48 MODULE_AUTHOR("Intel Corporation");
  49 MODULE_IMPORT_NS("CXL");