kernel/arch/x86/kernel/pmem.c

   1 /*
   2  * Copyright (c) 2015, Christoph Hellwig.
   3  */
   4 #include <linux/memblock.h>
   5 #include <linux/platform_device.h>
   6 #include <linux/slab.h>
   7 #include <asm/e820.h>
   8 #include <asm/page_types.h>
   9 #include <asm/setup.h>
  10
  11 static __init void register_pmem_device(struct resource *res)
  12 {
  13         struct platform_device *pdev;
  14         int error;
  15
  16         pdev = platform_device_alloc("pmem", PLATFORM_DEVID_AUTO);
  17         if (!pdev)
  18                 return;
  19
  20         error = platform_device_add_resources(pdev, res, 1);
  21         if (error)
  22                 goto out_put_pdev;
  23
  24         error = platform_device_add(pdev);
  25         if (error)
  26                 goto out_put_pdev;
  27         return;
  28
  29 out_put_pdev:
  30         dev_warn(&pdev->dev, "failed to add 'pmem' (persistent memory) device!\n");
  31         platform_device_put(pdev);
  32 }
  33
  34 static __init int register_pmem_devices(void)
  35 {
  36         int i;
  37
  38         for (i = 0; i < e820.nr_map; i++) {
  39                 struct e820entry *ei = &e820.map[i];
  40
  41                 if (ei->type == E820_PRAM) {
  42                         struct resource res = {
  43                                 .flags  = IORESOURCE_MEM,
  44                                 .start  = ei->addr,
  45                                 .end    = ei->addr + ei->size - 1,
  46                         };
  47                         register_pmem_device(&res);
  48                 }
  49         }
  50
  51         return 0;
  52 }
  53 device_initcall(register_pmem_devices);