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;
  21         phys_addr_t addr;
  22         int i;
  23
  24         for (i = 0; i < dev_dax->num_resources; i++) {
  25                 res = &dev_dax->res[i];
  26                 addr = pgoff * PAGE_SIZE + res->start;
  27                 if (addr >= res->start && addr <= res->end)
  28                         break;
  29                 pgoff -= PHYS_PFN(resource_size(res));
  30         }
  31
  32         if (i < dev_dax->num_resources) {
  33                 res = &dev_dax->res[i];
  34                 if (addr + size - 1 <= res->end) {
  35                         if (get_nfit_res(addr)) {
  36                                 struct page *page;
  37
  38                                 if (dev_dax->region->align > PAGE_SIZE)
  39                                         return -1;
  40
  41                                 page = vmalloc_to_page((void *)addr);
  42                                 return PFN_PHYS(page_to_pfn(page));
  43                         } else
  44                                 return addr;
  45                 }
  46         }
  47
  48         return -1;
  49 }