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