LXR linux/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
  10long __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}
  50