tools/testing/nvdimm/dax-dev.c

   1 /*
   2  * Copyright (c) 2016, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13 #include "test/nfit_test.h"
  14 #include <linux/mm.h>
  15 #include "../../../drivers/dax/dax-private.h"
  16
  17 phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
  18                 unsigned long size)
  19 {
  20         struct resource *res = &dev_dax->region->res;
  21         phys_addr_t addr;
  22
  23         addr = pgoff * PAGE_SIZE + res->start;
  24         if (addr >= res->start && addr <= res->end) {
  25                 if (addr + size - 1 <= res->end) {
  26                         if (get_nfit_res(addr)) {
  27                                 struct page *page;
  28
  29                                 if (dev_dax->region->align > PAGE_SIZE)
  30                                         return -1;
  31
  32                                 page = vmalloc_to_page((void *)addr);
  33                                 return PFN_PHYS(page_to_pfn(page));
  34                         } else
  35                                 return addr;
  36                 }
  37         }
  38         return -1;
  39 }