/* * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. */ #include "test/nfit_test.h" #include <linux/blkdev.h> #include <pmem.h> #include <nd.h> long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) { resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, PFN_PHYS(nr_pages)))) return -EIO; /* * Limit dax to a single page at a time given vmalloc()-backed * in the nfit_test case. */ if (get_nfit_res(pmem->phys_addr + offset)) { struct page *page; if (kaddr) *kaddr = pmem->virt_addr + offset; page = vmalloc_to_page(pmem->virt_addr + offset); if (pfn) *pfn = page_to_pfn_t(page); pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n", __func__, pmem, pgoff, page_to_pfn(page)); return 1; } if (kaddr) *kaddr = pmem->virt_addr + offset; if (pfn) *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); /* * If badblocks are present, limit known good range to the * requested range. */ if (unlikely(pmem->bb.count)) return nr_pages; return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); }