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976daac4a1
Add bcm voter driver and add support for RPMh specific interconnect providers which implements the set and aggregate functionalities that translates bandwidth requests into RPMh messages. These modules provide a common set of functionalities for all Qualcomm RPMh based interconnect providers and should help reduce code duplication when adding new providers. Signed-off-by: David Dai <daidavid1@codeaurora.org> Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Link: https://lore.kernel.org/r/20200228095951.15457-1-sibis@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020, The Linux Foundation. All rights reserved.
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*/
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#include <linux/interconnect.h>
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#include <linux/interconnect-provider.h>
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#include <linux/module.h>
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#include "bcm-voter.h"
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#include "icc-rpmh.h"
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/**
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* qcom_icc_pre_aggregate - cleans up stale values from prior icc_set
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* @node: icc node to operate on
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*/
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void qcom_icc_pre_aggregate(struct icc_node *node)
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{
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size_t i;
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struct qcom_icc_node *qn;
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qn = node->data;
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for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
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qn->sum_avg[i] = 0;
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qn->max_peak[i] = 0;
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}
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}
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EXPORT_SYMBOL_GPL(qcom_icc_pre_aggregate);
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/**
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* qcom_icc_aggregate - aggregate bw for buckets indicated by tag
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* @node: node to aggregate
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* @tag: tag to indicate which buckets to aggregate
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* @avg_bw: new bw to sum aggregate
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* @peak_bw: new bw to max aggregate
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* @agg_avg: existing aggregate avg bw val
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* @agg_peak: existing aggregate peak bw val
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*/
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int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
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u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
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{
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size_t i;
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struct qcom_icc_node *qn;
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struct qcom_icc_provider *qp;
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qn = node->data;
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qp = to_qcom_provider(node->provider);
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if (!tag)
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tag = QCOM_ICC_TAG_ALWAYS;
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for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
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if (tag & BIT(i)) {
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qn->sum_avg[i] += avg_bw;
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qn->max_peak[i] = max_t(u32, qn->max_peak[i], peak_bw);
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}
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}
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*agg_avg += avg_bw;
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*agg_peak = max_t(u32, *agg_peak, peak_bw);
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for (i = 0; i < qn->num_bcms; i++)
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qcom_icc_bcm_voter_add(qp->voter, qn->bcms[i]);
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_icc_aggregate);
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/**
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* qcom_icc_set - set the constraints based on path
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* @src: source node for the path to set constraints on
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* @dst: destination node for the path to set constraints on
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
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{
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struct qcom_icc_provider *qp;
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struct icc_node *node;
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if (!src)
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node = dst;
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else
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node = src;
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qp = to_qcom_provider(node->provider);
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qcom_icc_bcm_voter_commit(qp->voter);
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_icc_set);
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/**
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* qcom_icc_bcm_init - populates bcm aux data and connect qnodes
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* @bcm: bcm to be initialized
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* @dev: associated provider device
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*
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* Return: 0 on success, or an error code otherwise
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*/
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int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev)
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{
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struct qcom_icc_node *qn;
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const struct bcm_db *data;
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size_t data_count;
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int i;
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/* BCM is already initialised*/
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if (bcm->addr)
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return 0;
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bcm->addr = cmd_db_read_addr(bcm->name);
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if (!bcm->addr) {
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dev_err(dev, "%s could not find RPMh address\n",
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bcm->name);
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return -EINVAL;
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}
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data = cmd_db_read_aux_data(bcm->name, &data_count);
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if (IS_ERR(data)) {
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dev_err(dev, "%s command db read error (%ld)\n",
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bcm->name, PTR_ERR(data));
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return PTR_ERR(data);
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}
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if (!data_count) {
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dev_err(dev, "%s command db missing or partial aux data\n",
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bcm->name);
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return -EINVAL;
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}
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bcm->aux_data.unit = le32_to_cpu(data->unit);
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bcm->aux_data.width = le16_to_cpu(data->width);
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bcm->aux_data.vcd = data->vcd;
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bcm->aux_data.reserved = data->reserved;
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INIT_LIST_HEAD(&bcm->list);
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INIT_LIST_HEAD(&bcm->ws_list);
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/* Link Qnodes to their respective BCMs */
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for (i = 0; i < bcm->num_nodes; i++) {
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qn = bcm->nodes[i];
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qn->bcms[qn->num_bcms] = bcm;
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qn->num_bcms++;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_icc_bcm_init);
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MODULE_LICENSE("GPL v2");
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