1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux 1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /* 2 /*
3 * PAPR nvDimm Specific Methods (PDSM) and str 3 * PAPR nvDimm Specific Methods (PDSM) and structs for libndctl
4 * 4 *
5 * (C) Copyright IBM 2020 5 * (C) Copyright IBM 2020
6 * 6 *
7 * Author: Vaibhav Jain <vaibhav at linux.ibm. 7 * Author: Vaibhav Jain <vaibhav at linux.ibm.com>
8 */ 8 */
9 9
10 #ifndef _UAPI_ASM_POWERPC_PAPR_PDSM_H_ 10 #ifndef _UAPI_ASM_POWERPC_PAPR_PDSM_H_
11 #define _UAPI_ASM_POWERPC_PAPR_PDSM_H_ 11 #define _UAPI_ASM_POWERPC_PAPR_PDSM_H_
12 12
13 #include <linux/types.h> 13 #include <linux/types.h>
14 #include <linux/ndctl.h> 14 #include <linux/ndctl.h>
15 15
16 /* 16 /*
17 * PDSM Envelope: 17 * PDSM Envelope:
18 * 18 *
19 * The ioctl ND_CMD_CALL exchange data between 19 * The ioctl ND_CMD_CALL exchange data between user-space and kernel via
20 * envelope which consists of 2 headers sectio 20 * envelope which consists of 2 headers sections and payload sections as
21 * illustrated below: 21 * illustrated below:
22 * +-----------------+---------------+------- 22 * +-----------------+---------------+---------------------------+
23 * | 64-Bytes | 8-Bytes | 23 * | 64-Bytes | 8-Bytes | Max 184-Bytes |
24 * +-----------------+---------------+------- 24 * +-----------------+---------------+---------------------------+
25 * | ND-HEADER | PDSM-HEADER | P 25 * | ND-HEADER | PDSM-HEADER | PDSM-PAYLOAD |
26 * +-----------------+---------------+------- 26 * +-----------------+---------------+---------------------------+
27 * | nd_family | | 27 * | nd_family | | |
28 * | nd_size_out | cmd_status | 28 * | nd_size_out | cmd_status | |
29 * | nd_size_in | reserved | nd 29 * | nd_size_in | reserved | nd_pdsm_payload |
30 * | nd_command | payload --> | 30 * | nd_command | payload --> | |
31 * | nd_fw_size | | 31 * | nd_fw_size | | |
32 * | nd_payload ---> | | 32 * | nd_payload ---> | | |
33 * +---------------+-----------------+------- 33 * +---------------+-----------------+---------------------------+
34 * 34 *
35 * ND Header: 35 * ND Header:
36 * This is the generic libnvdimm header descri 36 * This is the generic libnvdimm header described as 'struct nd_cmd_pkg'
37 * which is interpreted by libnvdimm before pa 37 * which is interpreted by libnvdimm before passed on to papr_scm. Important
38 * member fields used are: 38 * member fields used are:
39 * 'nd_family' : (In) NVDIMM_FAMILY_P 39 * 'nd_family' : (In) NVDIMM_FAMILY_PAPR_SCM
40 * 'nd_size_in' : (In) PDSM-HEADER + P 40 * 'nd_size_in' : (In) PDSM-HEADER + PDSM-IN-PAYLOAD (usually 0)
41 * 'nd_size_out' : (In) PDSM-HEADER + P 41 * 'nd_size_out' : (In) PDSM-HEADER + PDSM-RETURN-PAYLOAD
42 * 'nd_command' : (In) One of PAPR_PDS 42 * 'nd_command' : (In) One of PAPR_PDSM_XXX
43 * 'nd_fw_size' : (Out) PDSM-HEADER + 43 * 'nd_fw_size' : (Out) PDSM-HEADER + size of actual payload returned
44 * 44 *
45 * PDSM Header: 45 * PDSM Header:
46 * This is papr-scm specific header that prece 46 * This is papr-scm specific header that precedes the payload. This is defined
47 * as nd_cmd_pdsm_pkg. Following fields aare 47 * as nd_cmd_pdsm_pkg. Following fields aare available in this header:
48 * 48 *
49 * 'cmd_status' : (Out) Errors if any 49 * 'cmd_status' : (Out) Errors if any encountered while servicing PDSM.
50 * 'reserved' : Not used, reserved f 50 * 'reserved' : Not used, reserved for future and should be set to 0.
51 * 'payload' : A union of all the p 51 * 'payload' : A union of all the possible payload structs
52 * 52 *
53 * PDSM Payload: 53 * PDSM Payload:
54 * 54 *
55 * The layout of the PDSM Payload is defined b 55 * The layout of the PDSM Payload is defined by various structs shared between
56 * papr_scm and libndctl so that contents of p 56 * papr_scm and libndctl so that contents of payload can be interpreted. As such
57 * its defined as a union of all possible payl 57 * its defined as a union of all possible payload structs as
58 * 'union nd_pdsm_payload'. Based on the value 58 * 'union nd_pdsm_payload'. Based on the value of 'nd_cmd_pkg.nd_command'
59 * appropriate member of the union is accessed 59 * appropriate member of the union is accessed.
60 */ 60 */
61 61
62 /* Max payload size that we can handle */ 62 /* Max payload size that we can handle */
63 #define ND_PDSM_PAYLOAD_MAX_SIZE 184 63 #define ND_PDSM_PAYLOAD_MAX_SIZE 184
64 64
65 /* Max payload size that we can handle */ 65 /* Max payload size that we can handle */
66 #define ND_PDSM_HDR_SIZE \ 66 #define ND_PDSM_HDR_SIZE \
67 (sizeof(struct nd_pkg_pdsm) - ND_PDSM_ 67 (sizeof(struct nd_pkg_pdsm) - ND_PDSM_PAYLOAD_MAX_SIZE)
68 68
69 /* Various nvdimm health indicators */ 69 /* Various nvdimm health indicators */
70 #define PAPR_PDSM_DIMM_HEALTHY 0 70 #define PAPR_PDSM_DIMM_HEALTHY 0
71 #define PAPR_PDSM_DIMM_UNHEALTHY 1 71 #define PAPR_PDSM_DIMM_UNHEALTHY 1
72 #define PAPR_PDSM_DIMM_CRITICAL 2 72 #define PAPR_PDSM_DIMM_CRITICAL 2
73 #define PAPR_PDSM_DIMM_FATAL 3 73 #define PAPR_PDSM_DIMM_FATAL 3
74 74
75 /* struct nd_papr_pdsm_health.extension_flags 75 /* struct nd_papr_pdsm_health.extension_flags field flags */
76 76
77 /* Indicate that the 'dimm_fuel_gauge' field i 77 /* Indicate that the 'dimm_fuel_gauge' field is valid */
78 #define PDSM_DIMM_HEALTH_RUN_GAUGE_VALID 1 78 #define PDSM_DIMM_HEALTH_RUN_GAUGE_VALID 1
79 79
80 /* Indicate that the 'dimm_dsc' field is valid 80 /* Indicate that the 'dimm_dsc' field is valid */
81 #define PDSM_DIMM_DSC_VALID 2 81 #define PDSM_DIMM_DSC_VALID 2
82 82
83 /* 83 /*
84 * Struct exchanged between kernel & ndctl in 84 * Struct exchanged between kernel & ndctl in for PAPR_PDSM_HEALTH
85 * Various flags indicate the health status of 85 * Various flags indicate the health status of the dimm.
86 * 86 *
87 * extension_flags : Any extension fields 87 * extension_flags : Any extension fields present in the struct.
88 * dimm_unarmed : Dimm not armed. So c 88 * dimm_unarmed : Dimm not armed. So contents wont persist.
89 * dimm_bad_shutdown : Previous shutdown di 89 * dimm_bad_shutdown : Previous shutdown did not persist contents.
90 * dimm_bad_restore : Contents from previo 90 * dimm_bad_restore : Contents from previous shutdown werent restored.
91 * dimm_scrubbed : Contents of the dimm 91 * dimm_scrubbed : Contents of the dimm have been scrubbed.
92 * dimm_locked : Contents of the dimm 92 * dimm_locked : Contents of the dimm cant be modified until CEC reboot
93 * dimm_encrypted : Contents of dimm are 93 * dimm_encrypted : Contents of dimm are encrypted.
94 * dimm_health : Dimm health indicato 94 * dimm_health : Dimm health indicator. One of PAPR_PDSM_DIMM_XXXX
95 * dimm_fuel_gauge : Life remaining of DI 95 * dimm_fuel_gauge : Life remaining of DIMM as a percentage from 0-100
96 */ 96 */
97 struct nd_papr_pdsm_health { 97 struct nd_papr_pdsm_health {
98 union { 98 union {
99 struct { 99 struct {
100 __u32 extension_flags; 100 __u32 extension_flags;
101 __u8 dimm_unarmed; 101 __u8 dimm_unarmed;
102 __u8 dimm_bad_shutdown 102 __u8 dimm_bad_shutdown;
103 __u8 dimm_bad_restore; 103 __u8 dimm_bad_restore;
104 __u8 dimm_scrubbed; 104 __u8 dimm_scrubbed;
105 __u8 dimm_locked; 105 __u8 dimm_locked;
106 __u8 dimm_encrypted; 106 __u8 dimm_encrypted;
107 __u16 dimm_health; 107 __u16 dimm_health;
108 108
109 /* Extension flag PDSM 109 /* Extension flag PDSM_DIMM_HEALTH_RUN_GAUGE_VALID */
110 __u16 dimm_fuel_gauge; 110 __u16 dimm_fuel_gauge;
111 111
112 /* Extension flag PDSM 112 /* Extension flag PDSM_DIMM_DSC_VALID */
113 __u64 dimm_dsc; 113 __u64 dimm_dsc;
114 }; 114 };
115 __u8 buf[ND_PDSM_PAYLOAD_MAX_S 115 __u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];
116 }; 116 };
117 }; 117 };
118 118
119 /* Flags for injecting specific smart errors * 119 /* Flags for injecting specific smart errors */
120 #define PDSM_SMART_INJECT_HEALTH_FATAL 120 #define PDSM_SMART_INJECT_HEALTH_FATAL (1 << 0)
121 #define PDSM_SMART_INJECT_BAD_SHUTDOWN 121 #define PDSM_SMART_INJECT_BAD_SHUTDOWN (1 << 1)
122 122
123 struct nd_papr_pdsm_smart_inject { 123 struct nd_papr_pdsm_smart_inject {
124 union { 124 union {
125 struct { 125 struct {
126 /* One or more of PDSM 126 /* One or more of PDSM_SMART_INJECT_ */
127 __u32 flags; 127 __u32 flags;
128 __u8 fatal_enable; 128 __u8 fatal_enable;
129 __u8 unsafe_shutdown_e 129 __u8 unsafe_shutdown_enable;
130 }; 130 };
131 __u8 buf[ND_PDSM_PAYLOAD_MAX_S 131 __u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];
132 }; 132 };
133 }; 133 };
134 134
135 /* 135 /*
136 * Methods to be embedded in ND_CMD_CALL reque 136 * Methods to be embedded in ND_CMD_CALL request. These are sent to the kernel
137 * via 'nd_cmd_pkg.nd_command' member of the i 137 * via 'nd_cmd_pkg.nd_command' member of the ioctl struct
138 */ 138 */
139 enum papr_pdsm { 139 enum papr_pdsm {
140 PAPR_PDSM_MIN = 0x0, 140 PAPR_PDSM_MIN = 0x0,
141 PAPR_PDSM_HEALTH, 141 PAPR_PDSM_HEALTH,
142 PAPR_PDSM_SMART_INJECT, 142 PAPR_PDSM_SMART_INJECT,
143 PAPR_PDSM_MAX, 143 PAPR_PDSM_MAX,
144 }; 144 };
145 145
146 /* Maximal union that can hold all possible pa 146 /* Maximal union that can hold all possible payload types */
147 union nd_pdsm_payload { 147 union nd_pdsm_payload {
148 struct nd_papr_pdsm_health health; 148 struct nd_papr_pdsm_health health;
149 struct nd_papr_pdsm_smart_inject smart 149 struct nd_papr_pdsm_smart_inject smart_inject;
150 __u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE]; 150 __u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];
151 } __packed; 151 } __packed;
152 152
153 /* 153 /*
154 * PDSM-header + payload expected with ND_CMD_ 154 * PDSM-header + payload expected with ND_CMD_CALL ioctl from libnvdimm
155 * Valid member of union 'payload' is identifi 155 * Valid member of union 'payload' is identified via 'nd_cmd_pkg.nd_command'
156 * that should always precede this struct when 156 * that should always precede this struct when sent to papr_scm via CMD_CALL
157 * interface. 157 * interface.
158 */ 158 */
159 struct nd_pkg_pdsm { 159 struct nd_pkg_pdsm {
160 __s32 cmd_status; /* Out: Sub-cm 160 __s32 cmd_status; /* Out: Sub-cmd status returned back */
161 __u16 reserved[2]; /* Ignored and 161 __u16 reserved[2]; /* Ignored and to be set as '' */
162 union nd_pdsm_payload payload; 162 union nd_pdsm_payload payload;
163 } __packed; 163 } __packed;
164 164
165 #endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */ 165 #endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */
166 166
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