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 10 long __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