1 /* 2 * Copyright (c) 2014-2016, Intel Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 */ 13 #include "test/nfit_test.h" 14 #include <linux/blkdev.h> 15 #include <pmem.h> 16 #include <nd.h> 17 18 long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, 19 long nr_pages, void **kaddr, pfn_t *pfn) 20 { 21 resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; 22 23 if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, 24 PFN_PHYS(nr_pages)))) 25 return -EIO; 26 27 /* 28 * Limit dax to a single page at a time given vmalloc()-backed 29 * in the nfit_test case. 30 */ 31 if (get_nfit_res(pmem->phys_addr + offset)) { 32 struct page *page; 33 34 if (kaddr) 35 *kaddr = pmem->virt_addr + offset; 36 page = vmalloc_to_page(pmem->virt_addr + offset); 37 if (pfn) 38 *pfn = page_to_pfn_t(page); 39 pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n", 40 __func__, pmem, pgoff, page_to_pfn(page)); 41 42 return 1; 43 } 44 45 if (kaddr) 46 *kaddr = pmem->virt_addr + offset; 47 if (pfn) 48 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); 49 50 /* 51 * If badblocks are present, limit known good range to the 52 * requested range. 53 */ 54 if (unlikely(pmem->bb.count)) 55 return nr_pages; 56 return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); 57 } 58