testing/nvdimm/pmem-dax.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2014-2016, Intel Corporation.
0004  */
0005 #include "test/nfit_test.h"
0006 #include <linux/blkdev.h>
0007 #include <linux/dax.h>
0008 #include <pmem.h>
0009 #include <nd.h>
0010
0011 long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
0012         long nr_pages, enum dax_access_mode mode, void **kaddr,
0013         pfn_t *pfn)
0014 {
0015     resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
0016
0017     if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
0018                     PFN_PHYS(nr_pages))))
0019         return -EIO;
0020
0021     /*
0022      * Limit dax to a single page at a time given vmalloc()-backed
0023      * in the nfit_test case.
0024      */
0025     if (get_nfit_res(pmem->phys_addr + offset)) {
0026         struct page *page;
0027
0028         if (kaddr)
0029             *kaddr = pmem->virt_addr + offset;
0030         page = vmalloc_to_page(pmem->virt_addr + offset);
0031         if (pfn)
0032             *pfn = page_to_pfn_t(page);
0033         pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
0034                 __func__, pmem, pgoff, page_to_pfn(page));
0035
0036         return 1;
0037     }
0038
0039     if (kaddr)
0040         *kaddr = pmem->virt_addr + offset;
0041     if (pfn)
0042         *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
0043
0044     /*
0045      * If badblocks are present, limit known good range to the
0046      * requested range.
0047      */
0048     if (unlikely(pmem->bb.count))
0049         return nr_pages;
0050     return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
0051 }