Intel_powerclamp on Xeon E3v3 Haswell?

Intel_powerclamp on Xeon E3v3 Haswell?

[Ilari Stenroth]

Hi,

Does somebody know why intel_powerclamp driver doesn't work on
a Xeon E3v3 CPU? Tried it on E3-1265L v3 but the driver gave out errors:
[  632.399837] intel_powerclamp: Start idle injection to reduce power
[  632.400068] intel_powerclamp: pkg cstate counter not functional, abort

cat /sys/kernel/debug/intel_powerclamp/powerclamp_calib 
controlling cpu: 0
pct confidence steady dynamic (compensation)
0	0	0	0
1	0	0	0
2	0	0	0
3	0	0	0
4	0	0	0
5	0	0	0
6	0	0	0
7	0	0	0
8	0	0	0
9	0	0	0
10	0	0	0
11	0	0	0
12	0	0	0
13	0	0	0
14	0	0	0
15	0	0	0
16	0	0	0
17	0	0	0
18	0	0	0
19	0	0	0
20	0	0	0
21	0	0	0
22	0	0	0
23	0	0	0
24	0	0	0
25	0	0	0
26	0	0	0
27	0	0	0
28	0	0	0
29	0	0	0
30	0	0	0
31	0	0	0
32	0	0	0
33	0	0	0
34	0	0	0
35	0	0	0
36	0	0	0
37	0	0	0
38	0	0	0
39	0	0	0
40	0	0	0
41	0	0	0
42	0	0	0
43	0	0	0
44	0	0	0
45	0	0	0
46	0	0	0
47	0	0	0
48	0	0	0
49	0	0	0

I've applied a simple patch to make intel_powerclamp detect a CPU
family 0x06 model 0x3c:

diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c
index b40b37c..bac481f 100644
--- a/drivers/thermal/intel_powerclamp.c
+++ b/drivers/thermal/intel_powerclamp.c
@@ -675,6 +675,7 @@ static const struct x86_cpu_id intel_powerclamp_ids[] = {
        { X86_VENDOR_INTEL, 6, 0x2e},
        { X86_VENDOR_INTEL, 6, 0x2f},
        { X86_VENDOR_INTEL, 6, 0x3a},
+       { X86_VENDOR_INTEL, 6, 0x3c},
        {}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_powerclamp_ids);


--
Ilari Stenroth