testing/nvdimm/dax-dev.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2016, Intel Corporation.
0004  */
0005 #include "test/nfit_test.h"
0006 #include <linux/mm.h>
0007 #include "../../../drivers/dax/dax-private.h"
0008
0009 phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
0010         unsigned long size)
0011 {
0012     int i;
0013
0014     for (i = 0; i < dev_dax->nr_range; i++) {
0015         struct dev_dax_range *dax_range = &dev_dax->ranges[i];
0016         struct range *range = &dax_range->range;
0017         unsigned long long pgoff_end;
0018         phys_addr_t addr;
0019
0020         pgoff_end = dax_range->pgoff + PHYS_PFN(range_len(range)) - 1;
0021         if (pgoff < dax_range->pgoff || pgoff > pgoff_end)
0022             continue;
0023         addr = PFN_PHYS(pgoff - dax_range->pgoff) + range->start;
0024         if (addr + size - 1 <= range->end) {
0025             if (get_nfit_res(addr)) {
0026                 struct page *page;
0027
0028                 if (dev_dax->region->align > PAGE_SIZE)
0029                     return -1;
0030
0031                 page = vmalloc_to_page((void *)addr);
0032                 return PFN_PHYS(page_to_pfn(page));
0033             }
0034             return addr;
0035         }
0036         break;
0037     }
0038     return -1;
0039 }