1 /* 2 * Copyright (c) 2014-2015, 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 14 #ifndef __NVDIMM_PFN_H 15 #define __NVDIMM_PFN_H 16 17 #include <linux/types.h> 18 #include <linux/mmzone.h> 19 20 #define PFN_SIG_LEN 16 21 #define PFN_SIG "NVDIMM_PFN_INFO\0" 22 #define DAX_SIG "NVDIMM_DAX_INFO\0" 23 24 struct nd_pfn_sb { 25 u8 signature[PFN_SIG_LEN]; 26 u8 uuid[16]; 27 u8 parent_uuid[16]; 28 __le32 flags; 29 __le16 version_major; 30 __le16 version_minor; 31 __le64 dataoff; /* relative to namespace_base + start_pad */ 32 __le64 npfns; 33 __le32 mode; 34 /* minor-version-1 additions for section alignment */ 35 __le32 start_pad; 36 __le32 end_trunc; 37 /* minor-version-2 record the base alignment of the mapping */ 38 __le32 align; 39 /* minor-version-3 guarantee the padding and flags are zero */ 40 u8 padding[4000]; 41 __le64 checksum; 42 }; 43 44 #ifdef CONFIG_SPARSEMEM 45 #define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x) 46 #define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x) 47 #else 48 /* 49 * In this case ZONE_DEVICE=n and we will disable 'pfn' device support, 50 * but we still want pmem to compile. 51 */ 52 #define PFN_SECTION_ALIGN_DOWN(x) (x) 53 #define PFN_SECTION_ALIGN_UP(x) (x) 54 #endif 55 56 #define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x))) 57 #define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x))) 58 #endif /* __NVDIMM_PFN_H */ 59