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