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 block_device *bdev, sector_t sector, 19 void **kaddr, pfn_t *pfn, long size) 20 { 21 struct pmem_device *pmem = bdev->bd_queue->queuedata; 22 resource_size_t offset = sector * 512 + pmem->data_offset; 23 24 if (unlikely(is_bad_pmem(&pmem->bb, sector, size))) 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 *kaddr = pmem->virt_addr + offset; 35 page = vmalloc_to_page(pmem->virt_addr + offset); 36 *pfn = page_to_pfn_t(page); 37 dev_dbg_ratelimited(disk_to_dev(bdev->bd_disk)->parent, 38 "%s: sector: %#llx pfn: %#lx\n", __func__, 39 (unsigned long long) sector, page_to_pfn(page)); 40 41 return PAGE_SIZE; 42 } 43 44 *kaddr = pmem->virt_addr + offset; 45 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); 46 47 /* 48 * If badblocks are present, limit known good range to the 49 * requested range. 50 */ 51 if (unlikely(pmem->bb.count)) 52 return size; 53 return pmem->size - pmem->pfn_pad - offset; 54 } 55