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68120783d6
MPMM - the Maximum Power Mitigation Mechanism - is an optional microarchitectural feature present on some Armv9-A cores, introduced with the Cortex-X2, Cortex-A710 and Cortex-A510 cores. MPMM allows the SoC firmware to detect and limit high activity events to assist in SoC processor power domain dynamic power budgeting and limit the triggering of whole-rail (i.e. clock chopping) responses to overcurrent conditions. This feature is enabled via the `ENABLE_MPMM` build option. Configuration can be done via FCONF by enabling `ENABLE_MPMM_FCONF`, or by via the plaform-implemented `plat_mpmm_topology` function. Change-Id: I77da82808ad4744ece8263f0bf215c5a091c3167 Signed-off-by: Chris Kay <chris.kay@arm.com>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
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* Copyright (c) 2021, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <common/debug.h>
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#include <common/fdt_wrappers.h>
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#include <lib/fconf/fconf.h>
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#include <lib/fconf/fconf_mpmm_getter.h>
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#include <libfdt.h>
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#include <plat/common/platform.h>
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struct fconf_mpmm_config fconf_mpmm_config;
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static struct mpmm_topology fconf_mpmm_topology;
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/*
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* Within a `cpu` node, determine support for MPMM via the `supports-mpmm`
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* property.
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*
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* Returns `0` on success, or a negative integer representing an error code.
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*/
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static int fconf_populate_mpmm_cpu(const void *fdt, int off, uintptr_t mpidr)
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{
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int ret, len;
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int core_pos;
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struct mpmm_core *core;
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core_pos = plat_core_pos_by_mpidr(mpidr);
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if (core_pos < 0) {
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return -FDT_ERR_BADVALUE;
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}
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core = &fconf_mpmm_topology.cores[core_pos];
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fdt_getprop(fdt, off, "supports-mpmm", &len);
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if (len >= 0) {
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core->supported = true;
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ret = 0;
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} else {
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core->supported = false;
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ret = len;
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}
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return ret;
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}
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/*
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* Populates the global `fconf_mpmm_config` structure based on what's described
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* by the hardware configuration device tree blob.
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*
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* The device tree is expected to provide a `supports-mpmm` property for each
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* `cpu` node, like so:
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*
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* cpu@0 {
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* supports-mpmm;
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* };
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*
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* This property indicates whether the core implements MPMM, as we cannot detect
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* support for it dynamically.
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*/
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static int fconf_populate_mpmm(uintptr_t config)
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{
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int ret = fdtw_for_each_cpu(
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(const void *)config, fconf_populate_mpmm_cpu);
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if (ret == 0) {
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fconf_mpmm_config.topology = &fconf_mpmm_topology;
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} else {
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ERROR("FCONF: failed to configure MPMM: %d\n", ret);
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}
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return ret;
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}
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FCONF_REGISTER_POPULATOR(HW_CONFIG, mpmm, fconf_populate_mpmm);
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