770c69f037
It's often useful during test, debug, and development to issue path
votes from shell. Add a debugfs client for this purpose.
Example usage:
cd /sys/kernel/debug/interconnect/test-client/
# Configure node endpoints for the path from CPU to DDR on
# qcom/sm8550.
echo chm_apps > src_node
echo ebi > dst_node
# Get path between src_node and dst_node. This is only
# necessary after updating the node endpoints.
echo 1 > get
# Set desired BW to 1GBps avg and 2GBps peak.
echo 1000000 > avg_bw
echo 2000000 > peak_bw
# Vote for avg_bw and peak_bw on the latest path from "get".
# Voting for multiple paths is possible by repeating this
# process for different nodes endpoints.
echo 1 > commit
Allowing userspace to directly enable and set bus rates can be dangerous
So, following in the footsteps of the regmap [0] and clk [1] frameworks,
keep these userspace controls compile-time disabled without Kconfig
options to enable them. Enabling this will require code changes to
define INTERCONNECT_ALLOW_WRITE_DEBUGFS.
[0] commit 09c6ecd39410 ("regmap: Add support for writing to regmap registers via debugfs")
[1] commit 37215da5553e ("clk: Add support for setting clk_rate via debugfs")
Signed-off-by: Mike Tipton <quic_mdtipton@quicinc.com>
Link: https://lore.kernel.org/r/20230807142914.12480-4-quic_mdtipton@quicinc.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Interconnect framework internal structs
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*
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* Copyright (c) 2019, Linaro Ltd.
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* Author: Georgi Djakov <georgi.djakov@linaro.org>
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*/
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#ifndef __DRIVERS_INTERCONNECT_INTERNAL_H
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#define __DRIVERS_INTERCONNECT_INTERNAL_H
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/**
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* struct icc_req - constraints that are attached to each node
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* @req_node: entry in list of requests for the particular @node
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* @node: the interconnect node to which this constraint applies
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* @dev: reference to the device that sets the constraints
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* @enabled: indicates whether the path with this request is enabled
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* @tag: path tag (optional)
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* @avg_bw: an integer describing the average bandwidth in kBps
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* @peak_bw: an integer describing the peak bandwidth in kBps
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*/
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struct icc_req {
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struct hlist_node req_node;
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struct icc_node *node;
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struct device *dev;
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bool enabled;
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u32 tag;
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u32 avg_bw;
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u32 peak_bw;
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};
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/**
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* struct icc_path - interconnect path structure
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* @name: a string name of the path (useful for ftrace)
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* @num_nodes: number of hops (nodes)
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* @reqs: array of the requests applicable to this path of nodes
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*/
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struct icc_path {
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const char *name;
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size_t num_nodes;
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struct icc_req reqs[];
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};
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struct icc_path *icc_get(struct device *dev, const char *src, const char *dst);
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int icc_debugfs_client_init(struct dentry *icc_dir);
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#endif
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