LXR linux/tools/testing/nvdimm/pmem-dax.c

   1/*
   2 * Copyright (c) 2014-2016, 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/blkdev.h>
  15#include <pmem.h>
  16#include <nd.h>
  17
  18long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
  19                long nr_pages, void **kaddr, pfn_t *pfn)
  20{
  21        resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
  22
  23        if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
  24                                        PFN_PHYS(nr_pages))))
  25                return -EIO;
  26
  27        /*
  28         * Limit dax to a single page at a time given vmalloc()-backed
  29         * in the nfit_test case.
  30         */
  31        if (get_nfit_res(pmem->phys_addr + offset)) {
  32                struct page *page;
  33
  34                *kaddr = pmem->virt_addr + offset;
  35                page = vmalloc_to_page(pmem->virt_addr + offset);
  36                *pfn = page_to_pfn_t(page);
  37                pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
  38                                __func__, pmem, pgoff, page_to_pfn(page));
  39
  40                return 1;
  41        }
  42
  43        *kaddr = pmem->virt_addr + offset;
  44        *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
  45
  46        /*
  47         * If badblocks are present, limit known good range to the
  48         * requested range.
  49         */
  50        if (unlikely(pmem->bb.count))
  51                return nr_pages;
  52        return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
  53}
  54