1 =========================================== 1 ===========================================
2 GPU Power/Thermal Controls and Monitoring 2 GPU Power/Thermal Controls and Monitoring
3 =========================================== 3 ===========================================
4 4
5 HWMON Interfaces 5 HWMON Interfaces
6 ================ 6 ================
7 7
8 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 8 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
9 :doc: hwmon 9 :doc: hwmon
10 10
11 GPU sysfs Power State Interfaces 11 GPU sysfs Power State Interfaces
12 ================================ 12 ================================
13 13
14 GPU power controls are exposed via sysfs files 14 GPU power controls are exposed via sysfs files.
15 15
16 power_dpm_state 16 power_dpm_state
17 --------------- 17 ---------------
18 18
19 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 19 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
20 :doc: power_dpm_state 20 :doc: power_dpm_state
21 21
22 power_dpm_force_performance_level 22 power_dpm_force_performance_level
23 --------------------------------- 23 ---------------------------------
24 24
25 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 25 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
26 :doc: power_dpm_force_performance_level 26 :doc: power_dpm_force_performance_level
27 27
28 pp_table 28 pp_table
29 -------- 29 --------
30 30
31 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 31 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
32 :doc: pp_table 32 :doc: pp_table
33 33
34 pp_od_clk_voltage 34 pp_od_clk_voltage
35 ----------------- 35 -----------------
36 36
37 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 37 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
38 :doc: pp_od_clk_voltage 38 :doc: pp_od_clk_voltage
39 39
40 pp_dpm_* 40 pp_dpm_*
41 -------- 41 --------
42 42
43 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 43 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
44 :doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk 44 :doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_dcefclk pp_dpm_pcie
45 45
46 pp_power_profile_mode 46 pp_power_profile_mode
47 --------------------- 47 ---------------------
48 48
49 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 49 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
50 :doc: pp_power_profile_mode 50 :doc: pp_power_profile_mode
51 51
52 pm_policy <<
53 --------------------- <<
54 <<
55 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ <<
56 :doc: pm_policy <<
57 <<
58 \*_busy_percent 52 \*_busy_percent
59 --------------- 53 ---------------
60 54
61 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 55 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
62 :doc: gpu_busy_percent 56 :doc: gpu_busy_percent
63 57
64 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 58 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
65 :doc: mem_busy_percent 59 :doc: mem_busy_percent
66 60
67 gpu_metrics 61 gpu_metrics
68 ----------- 62 -----------
69 63
70 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ 64 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
71 :doc: gpu_metrics 65 :doc: gpu_metrics
72 66
73 fan_curve <<
74 --------- <<
75 <<
76 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ <<
77 :doc: fan_curve <<
78 <<
79 acoustic_limit_rpm_threshold <<
80 ---------------------------- <<
81 <<
82 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ <<
83 :doc: acoustic_limit_rpm_threshold <<
84 <<
85 acoustic_target_rpm_threshold <<
86 ----------------------------- <<
87 <<
88 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ <<
89 :doc: acoustic_target_rpm_threshold <<
90 <<
91 fan_target_temperature <<
92 ---------------------- <<
93 <<
94 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ <<
95 :doc: fan_target_temperature <<
96 <<
97 fan_minimum_pwm <<
98 --------------- <<
99 <<
100 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_ <<
101 :doc: fan_minimum_pwm <<
102 <<
103 GFXOFF 67 GFXOFF
104 ====== 68 ======
105 69
106 GFXOFF is a feature found in most recent GPUs 70 GFXOFF is a feature found in most recent GPUs that saves power at runtime. The
107 card's RLC (RunList Controller) firmware power 71 card's RLC (RunList Controller) firmware powers off the gfx engine
108 dynamically when there is no workload on gfx o 72 dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by
109 default on supported GPUs. 73 default on supported GPUs.
110 74
111 Userspace can interact with GFXOFF through a d !! 75 Userspace can interact with GFXOFF through a debugfs interface:
112 `uint32_t`, unless otherwise noted): <<
113 76
114 ``amdgpu_gfxoff`` 77 ``amdgpu_gfxoff``
115 ----------------- 78 -----------------
116 79
117 Use it to enable/disable GFXOFF, and to check 80 Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled::
118 81
119 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_ 82 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff
120 01 83 01
121 84
122 - Write 0 to disable it, and 1 to enable it. 85 - Write 0 to disable it, and 1 to enable it.
123 - Read 0 means it's disabled, 1 it's enabled. 86 - Read 0 means it's disabled, 1 it's enabled.
124 87
125 If it's enabled, that means that the GPU is fr 88 If it's enabled, that means that the GPU is free to enter into GFXOFF mode as
126 needed. Disabled means that it will never ente 89 needed. Disabled means that it will never enter GFXOFF mode.
127 90
128 ``amdgpu_gfxoff_status`` 91 ``amdgpu_gfxoff_status``
129 ------------------------ 92 ------------------------
130 93
131 Read it to check current GFXOFF's status of a 94 Read it to check current GFXOFF's status of a GPU::
132 95
133 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_ 96 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status
134 02 97 02
135 98
136 - 0: GPU is in GFXOFF state, the gfx engine is 99 - 0: GPU is in GFXOFF state, the gfx engine is powered down.
137 - 1: Transition out of GFXOFF state 100 - 1: Transition out of GFXOFF state
138 - 2: Not in GFXOFF state 101 - 2: Not in GFXOFF state
139 - 3: Transition into GFXOFF state 102 - 3: Transition into GFXOFF state
140 103
141 If GFXOFF is enabled, the value will be transi 104 If GFXOFF is enabled, the value will be transitioning around [0, 3], always
142 getting into 0 when possible. When it's disabl 105 getting into 0 when possible. When it's disabled, it's always at 2. Returns
143 ``-EINVAL`` if it's not supported. 106 ``-EINVAL`` if it's not supported.
144 <<
145 ``amdgpu_gfxoff_count`` <<
146 ----------------------- <<
147 <<
148 Read it to get the total GFXOFF entry count at <<
149 power-up. The value is an `uint64_t` type, how <<
150 it can currently overflow as an `uint32_t`. *O <<
151 <<
152 ``amdgpu_gfxoff_residency`` <<
153 --------------------------- <<
154 <<
155 Write 1 to amdgpu_gfxoff_residency to start lo <<
156 get average GFXOFF residency % multiplied by 1 <<
157 interval. E.g. a value of 7854 means 78.54% of <<
158 interval the GPU was in GFXOFF mode. *Only sup <<
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.