From bb5c255907378a5c5798b5dab3616df1e63d3ee7 Mon Sep 17 00:00:00 2001 From: Tim Wawrzynczak Date: Fri, 29 May 2020 14:46:19 -0600 Subject: dptf: Add support for Running Average Power Limits 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/41890 Tested-by: build bot (Jenkins) Reviewed-by: Duncan Laurie --- src/acpi/acpigen_dptf.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'src/acpi/acpigen_dptf.c') diff --git a/src/acpi/acpigen_dptf.c b/src/acpi/acpigen_dptf.c index 6caf8bfcaf..9be3f5be8f 100644 --- a/src/acpi/acpigen_dptf.c +++ b/src/acpi/acpigen_dptf.c @@ -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 */ +} -- cgit v1.2.3