Commit | Line | Data |
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18da2c9e | 1 | menuconfig LIBNVDIMM |
b94d5230 DW |
2 | tristate "NVDIMM (Non-Volatile Memory Device) Support" |
3 | depends on PHYS_ADDR_T_64BIT | |
29b9aa0a | 4 | depends on HAS_IOMEM |
b94d5230 DW |
5 | depends on BLK_DEV |
6 | help | |
7 | Generic support for non-volatile memory devices including | |
8 | ACPI-6-NFIT defined resources. On platforms that define an | |
9 | NFIT, or otherwise can discover NVDIMM resources, a libnvdimm | |
10 | bus is registered to advertise PMEM (persistent memory) | |
11 | namespaces (/dev/pmemX) and BLK (sliding mmio window(s)) | |
5212e11f VV |
12 | namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a |
13 | memory resource that may span multiple DIMMs and support DAX | |
14 | (see CONFIG_DAX). A BLK namespace refers to an NVDIMM control | |
15 | region which exposes an mmio register set for windowed access | |
16 | mode to non-volatile memory. | |
18da2c9e DW |
17 | |
18 | if LIBNVDIMM | |
19 | ||
20 | config BLK_DEV_PMEM | |
21 | tristate "PMEM: Persistent memory block device support" | |
22 | default LIBNVDIMM | |
2080e88a | 23 | select DAX_DRIVER |
5212e11f | 24 | select ND_BTT if BTT |
e1455744 | 25 | select ND_PFN if NVDIMM_PFN |
18da2c9e DW |
26 | help |
27 | Memory ranges for PMEM are described by either an NFIT | |
28 | (NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a | |
29 | non-standard OEM-specific E820 memory type (type-12, see | |
30 | CONFIG_X86_PMEM_LEGACY), or it is manually specified by the | |
31 | 'memmap=nn[KMG]!ss[KMG]' kernel command line (see | |
8c27ceff | 32 | Documentation/admin-guide/kernel-parameters.rst). This driver converts |
18da2c9e DW |
33 | these persistent memory ranges into block devices that are |
34 | capable of DAX (direct-access) file system mappings. See | |
35 | Documentation/nvdimm/nvdimm.txt for more details. | |
36 | ||
37 | Say Y if you want to use an NVDIMM | |
38 | ||
047fc8a1 RZ |
39 | config ND_BLK |
40 | tristate "BLK: Block data window (aperture) device support" | |
41 | default LIBNVDIMM | |
42 | select ND_BTT if BTT | |
43 | help | |
44 | Support NVDIMMs, or other devices, that implement a BLK-mode | |
45 | access capability. BLK-mode access uses memory-mapped-i/o | |
46 | apertures to access persistent media. | |
47 | ||
48 | Say Y if your platform firmware emits an ACPI.NFIT table | |
49 | (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode | |
50 | capabilities. | |
51 | ||
e1455744 DW |
52 | config ND_CLAIM |
53 | bool | |
54 | ||
5212e11f VV |
55 | config ND_BTT |
56 | tristate | |
57 | ||
8c2f7e86 | 58 | config BTT |
5212e11f VV |
59 | bool "BTT: Block Translation Table (atomic sector updates)" |
60 | default y if LIBNVDIMM | |
e1455744 | 61 | select ND_CLAIM |
5212e11f VV |
62 | help |
63 | The Block Translation Table (BTT) provides atomic sector | |
64 | update semantics for persistent memory devices, so that | |
65 | applications that rely on sector writes not being torn (a | |
66 | guarantee that typical disks provide) can continue to do so. | |
67 | The BTT manifests itself as an alternate personality for an | |
68 | NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX, | |
69 | ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys, | |
70 | etc...). | |
71 | ||
72 | Select Y if unsure | |
8c2f7e86 | 73 | |
e1455744 DW |
74 | config ND_PFN |
75 | tristate | |
76 | ||
77 | config NVDIMM_PFN | |
78 | bool "PFN: Map persistent (device) memory" | |
79 | default LIBNVDIMM | |
32ab0a3f | 80 | depends on ZONE_DEVICE |
e1455744 DW |
81 | select ND_CLAIM |
82 | help | |
83 | Map persistent memory, i.e. advertise it to the memory | |
84 | management sub-system. By default persistent memory does | |
85 | not support direct I/O, RDMA, or any other usage that | |
86 | requires a 'struct page' to mediate an I/O request. This | |
87 | driver allocates and initializes the infrastructure needed | |
88 | to support those use cases. | |
89 | ||
90 | Select Y if unsure | |
91 | ||
cd03412a | 92 | config NVDIMM_DAX |
867dfe34 | 93 | bool "NVDIMM DAX: Raw access to persistent memory" |
cd03412a DW |
94 | default LIBNVDIMM |
95 | depends on NVDIMM_PFN | |
96 | help | |
97 | Support raw device dax access to a persistent memory | |
98 | namespace. For environments that want to hard partition | |
83fc61a5 | 99 | persistent memory, this capability provides a mechanism to |
cd03412a DW |
100 | sub-divide a namespace into character devices that can only be |
101 | accessed via DAX (mmap(2)). | |
102 | ||
103 | Select Y if unsure | |
104 | ||
71719760 | 105 | config OF_PMEM |
f22acf82 | 106 | tristate "Device-tree support for persistent memory regions" |
71719760 OH |
107 | depends on OF |
108 | default LIBNVDIMM | |
109 | help | |
110 | Allows regions of persistent memory to be described in the | |
111 | device-tree. | |
112 | ||
113 | Select Y if unsure. | |
114 | ||
4c6926a2 DJ |
115 | config NVDIMM_KEYS |
116 | def_bool y | |
117 | depends on ENCRYPTED_KEYS | |
118 | depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m | |
119 | ||
18da2c9e | 120 | endif |