LXR linux/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
  17phys_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}
  50