tools/testing/nvdimm/pmem-dax.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014-2016, Intel Corporation.
   4  */
   5 #include "test/nfit_test.h"
   6 #include <linux/blkdev.h>
   7 #include <linux/dax.h>
   8 #include <pmem.h>
   9 #include <nd.h>
  10
  11 long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
  12                 long nr_pages, enum dax_access_mode mode, void **kaddr,
  13                 pfn_t *pfn)
  14 {
  15         resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
  16
  17         if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
  18                                         PFN_PHYS(nr_pages))))
  19                 return -EIO;
  20
  21         /*
  22          * Limit dax to a single page at a time given vmalloc()-backed
  23          * in the nfit_test case.
  24          */
  25         if (get_nfit_res(pmem->phys_addr + offset)) {
  26                 struct page *page;
  27
  28                 if (kaddr)
  29                         *kaddr = pmem->virt_addr + offset;
  30                 page = vmalloc_to_page(pmem->virt_addr + offset);
  31                 if (pfn)
  32                         *pfn = page_to_pfn_t(page);
  33                 pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
  34                                 __func__, pmem, pgoff, page_to_pfn(page));
  35
  36                 return 1;
  37         }
  38
  39         if (kaddr)
  40                 *kaddr = pmem->virt_addr + offset;
  41         if (pfn)
  42                 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
  43
  44         /*
  45          * If badblocks are present, limit known good range to the
  46          * requested range.
  47          */
  48         if (unlikely(pmem->bb.count))
  49                 return nr_pages;
  50         return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
  51 }