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dptf: Add support for Running Average Power Limits

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This change adds support for emitting the PPCC table, which describes
the ranges available as knobs for DPTF to tune. It can support min/max
power, min/max time window for averaging, and the minimum adjustment size
(granularity or step size) of each power limit. The current implementation
only supports PL1 and PL2.

BUG=b:143539650
TEST=compiles

Change-Id: I67e80d661ea5bb79980ef285eca40c9a4b0f1849
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41890
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Tim Wawrzynczak
2020-05-29 14:46:19 -06:00
committed by Patrick Georgi
parent 2ad8ffed6f
commit bb5c255907
4 changed files with 75 additions and 0 deletions
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46
src/acpi/acpigen_dptf.c
View File

@@ -15,6 +15,9 @@ enum {
DEFAULT_TRIP_POINT = 0xFFFFFFFFull,
DEFAULT_WEIGHT = 100,
DPTF_MAX_ART_THRESHOLDS = 10,
PPCC_REVISION = 2,
RAPL_PL1_INDEX = 0,
RAPL_PL2_INDEX = 1,
};
/* Convert degrees C to 1/10 degree Kelvin for ACPI */
@@ -358,3 +361,46 @@ void dptf_write_fan_perf(const struct dptf_fan_perf *states, int max_count)
acpigen_pop_len(); /* Package */
acpigen_pop_len(); /* Scope */
}
void dptf_write_power_limits(const struct dptf_power_limits *limits)
{
char *pkg_count;
/* Nothing to do */
if (!limits->pl1.min_power && !limits->pl2.min_power)
return;
dptf_write_scope(DPTF_CPU);
acpigen_write_method("PPCC", 0);
pkg_count = acpigen_write_package(1); /* 1 for the Revision */
acpigen_write_integer(PPCC_REVISION); /* revision */
if (limits->pl1.min_power) {
(*pkg_count)++;
acpigen_write_package(6);
acpigen_write_integer(RAPL_PL1_INDEX);
acpigen_write_integer(limits->pl1.min_power);
acpigen_write_integer(limits->pl1.max_power);
acpigen_write_integer(limits->pl1.time_window_min);
acpigen_write_integer(limits->pl1.time_window_max);
acpigen_write_integer(limits->pl1.granularity);
acpigen_pop_len(); /* inner Package */
}
if (limits->pl2.min_power) {
(*pkg_count)++;
acpigen_write_package(6);
acpigen_write_integer(RAPL_PL2_INDEX);
acpigen_write_integer(limits->pl2.min_power);
acpigen_write_integer(limits->pl2.max_power);
acpigen_write_integer(limits->pl2.time_window_min);
acpigen_write_integer(limits->pl2.time_window_max);
acpigen_write_integer(limits->pl2.granularity);
acpigen_pop_len(); /* inner Package */
}
acpigen_pop_len(); /* outer Package */
acpigen_pop_len(); /* Method */
acpigen_pop_len(); /* Scope */
}