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1// SPDX-License-Identifier: GPL-2.0-only2/*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 11long __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()-backed23 * 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 the46 * requested range.47 */48 if (unlikely(pmem->bb.count))49 return nr_pages;50 return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);51}52