1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * linux/include/linux/amd-pstate.h |
4 | * |
5 | * Copyright (C) 2022 Advanced Micro Devices, Inc. |
6 | * |
7 | * Author: Meng Li <li.meng@amd.com> |
8 | */ |
9 | |
10 | #ifndef _LINUX_AMD_PSTATE_H |
11 | #define _LINUX_AMD_PSTATE_H |
12 | |
13 | #include <linux/pm_qos.h> |
14 | |
15 | #define AMD_CPPC_EPP_PERFORMANCE 0x00 |
16 | #define AMD_CPPC_EPP_BALANCE_PERFORMANCE 0x80 |
17 | #define AMD_CPPC_EPP_BALANCE_POWERSAVE 0xBF |
18 | #define AMD_CPPC_EPP_POWERSAVE 0xFF |
19 | |
20 | /********************************************************************* |
21 | * AMD P-state INTERFACE * |
22 | *********************************************************************/ |
23 | /** |
24 | * struct amd_aperf_mperf |
25 | * @aperf: actual performance frequency clock count |
26 | * @mperf: maximum performance frequency clock count |
27 | * @tsc: time stamp counter |
28 | */ |
29 | struct amd_aperf_mperf { |
30 | u64 aperf; |
31 | u64 mperf; |
32 | u64 tsc; |
33 | }; |
34 | |
35 | /** |
36 | * struct amd_cpudata - private CPU data for AMD P-State |
37 | * @cpu: CPU number |
38 | * @req: constraint request to apply |
39 | * @cppc_req_cached: cached performance request hints |
40 | * @highest_perf: the maximum performance an individual processor may reach, |
41 | * assuming ideal conditions |
42 | * @nominal_perf: the maximum sustained performance level of the processor, |
43 | * assuming ideal operating conditions |
44 | * @lowest_nonlinear_perf: the lowest performance level at which nonlinear power |
45 | * savings are achieved |
46 | * @lowest_perf: the absolute lowest performance level of the processor |
47 | * @max_freq: the frequency that mapped to highest_perf |
48 | * @min_freq: the frequency that mapped to lowest_perf |
49 | * @nominal_freq: the frequency that mapped to nominal_perf |
50 | * @lowest_nonlinear_freq: the frequency that mapped to lowest_nonlinear_perf |
51 | * @cur: Difference of Aperf/Mperf/tsc count between last and current sample |
52 | * @prev: Last Aperf/Mperf/tsc count value read from register |
53 | * @freq: current cpu frequency value |
54 | * @boost_supported: check whether the Processor or SBIOS supports boost mode |
55 | * @epp_policy: Last saved policy used to set energy-performance preference |
56 | * @epp_cached: Cached CPPC energy-performance preference value |
57 | * @policy: Cpufreq policy value |
58 | * @cppc_cap1_cached Cached MSR_AMD_CPPC_CAP1 register value |
59 | * |
60 | * The amd_cpudata is key private data for each CPU thread in AMD P-State, and |
61 | * represents all the attributes and goals that AMD P-State requests at runtime. |
62 | */ |
63 | struct amd_cpudata { |
64 | int cpu; |
65 | |
66 | struct freq_qos_request req[2]; |
67 | u64 cppc_req_cached; |
68 | |
69 | u32 highest_perf; |
70 | u32 nominal_perf; |
71 | u32 lowest_nonlinear_perf; |
72 | u32 lowest_perf; |
73 | |
74 | u32 max_freq; |
75 | u32 min_freq; |
76 | u32 nominal_freq; |
77 | u32 lowest_nonlinear_freq; |
78 | |
79 | struct amd_aperf_mperf cur; |
80 | struct amd_aperf_mperf prev; |
81 | |
82 | u64 freq; |
83 | bool boost_supported; |
84 | |
85 | /* EPP feature related attributes*/ |
86 | s16 epp_policy; |
87 | s16 epp_cached; |
88 | u32 policy; |
89 | u64 cppc_cap1_cached; |
90 | bool suspended; |
91 | }; |
92 | |
93 | /* |
94 | * enum amd_pstate_mode - driver working mode of amd pstate |
95 | */ |
96 | enum amd_pstate_mode { |
97 | AMD_PSTATE_UNDEFINED = 0, |
98 | AMD_PSTATE_DISABLE, |
99 | AMD_PSTATE_PASSIVE, |
100 | AMD_PSTATE_ACTIVE, |
101 | AMD_PSTATE_GUIDED, |
102 | AMD_PSTATE_MAX, |
103 | }; |
104 | |
105 | static const char * const amd_pstate_mode_string[] = { |
106 | [AMD_PSTATE_UNDEFINED] = "undefined" , |
107 | [AMD_PSTATE_DISABLE] = "disable" , |
108 | [AMD_PSTATE_PASSIVE] = "passive" , |
109 | [AMD_PSTATE_ACTIVE] = "active" , |
110 | [AMD_PSTATE_GUIDED] = "guided" , |
111 | NULL, |
112 | }; |
113 | #endif /* _LINUX_AMD_PSTATE_H */ |
114 | |