Re: [RFC PATCH 3/4] interconnect: qcom: Refactor icc rpmh support

From: Georgi Djakov
Date: Mon Oct 28 2019 - 12:31:55 EST

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Hi David,

On 17.10.19 Ð. 5:20 Ñ., David Dai wrote:
> Add bcm voter driver and add support for RPMh specific interconnect
> providers so that they may be re-used for icc-next RPMh based provider
> drivers.

For icc-next? You mean to be re-used for other RPMh based drivers?

>
> Signed-off-by: David Dai <daidavid1@xxxxxxxxxxxxxx>
> ---
> drivers/interconnect/qcom/Kconfig | 8 +
> drivers/interconnect/qcom/Makefile | 4 +
> drivers/interconnect/qcom/bcm-voter.c | 355 ++++++++++++++++++++++++++++++++++
> drivers/interconnect/qcom/bcm-voter.h | 28 +++
> drivers/interconnect/qcom/icc-rpmh.c | 154 +++++++++++++++
> drivers/interconnect/qcom/icc-rpmh.h | 150 ++++++++++++++
> 6 files changed, 699 insertions(+)
> create mode 100644 drivers/interconnect/qcom/bcm-voter.c
> create mode 100644 drivers/interconnect/qcom/bcm-voter.h
> create mode 100644 drivers/interconnect/qcom/icc-rpmh.c
> create mode 100644 drivers/interconnect/qcom/icc-rpmh.h
>
> diff --git a/drivers/interconnect/qcom/Kconfig b/drivers/interconnect/qcom/Kconfig
> index 6ab4012..8ff255d 100644
> --- a/drivers/interconnect/qcom/Kconfig
> +++ b/drivers/interconnect/qcom/Kconfig
> @@ -18,9 +18,17 @@ config INTERCONNECT_QCOM_SDM845
> tristate "Qualcomm SDM845 interconnect driver"
> depends on INTERCONNECT_QCOM
> depends on (QCOM_RPMH && QCOM_COMMAND_DB && OF) || COMPILE_TEST
> + select INTERCONNECT_QCOM_RPMH
> + select INTERCONNECT_QCOM_BCM_VOTER
> help
> This is a driver for the Qualcomm Network-on-Chip on sdm845-based
> platforms.
>
> +config INTERCONNECT_QCOM_BCM_VOTER
> + tristate
> +
> +config INTERCONNECT_QCOM_RPMH
> + tristate
> +> config INTERCONNECT_QCOM_SMD_RPM
> tristate
> diff --git a/drivers/interconnect/qcom/Makefile b/drivers/interconnect/qcom/Makefile
> index 67dafb7..0f5e88d 100644
> --- a/drivers/interconnect/qcom/Makefile
> +++ b/drivers/interconnect/qcom/Makefile
> @@ -3,7 +3,11 @@
> qnoc-qcs404-objs := qcs404.o
> qnoc-sdm845-objs := sdm845.o
> icc-smd-rpm-objs := smd-rpm.o
> +bcm-voter-objs := bcm-voter.o

Maybe icc-bcm-voter-objs. Does the BCM vote for stuff other than bandwidth?

> +icc-rpmh-obj := icc-rpmh.o
>
> obj-$(CONFIG_INTERCONNECT_QCOM_QCS404) += qnoc-qcs404.o
> obj-$(CONFIG_INTERCONNECT_QCOM_SDM845) += qnoc-sdm845.o
> obj-$(CONFIG_INTERCONNECT_QCOM_SMD_RPM) += icc-smd-rpm.o
> +obj-$(CONFIG_INTERCONNECT_QCOM_BCM_VOTER) += bcm-voter.o
> +obj-$(CONFIG_INTERCONNECT_QCOM_RPMH) += icc-rpmh.o
> diff --git a/drivers/interconnect/qcom/bcm-voter.c b/drivers/interconnect/qcom/bcm-voter.c
> new file mode 100644
> index 0000000..f74ae5f
> --- /dev/null
> +++ b/drivers/interconnect/qcom/bcm-voter.c
[..]
> +/**
> + * of_bcm_voter_get - gets a bcm voter handle from DT node
> + * @dev: device pointer for the consumer device
> + * @name: name for the bcm voter device
> + *
> + * This function will match a device_node pointer for the phandle
> + * specified in the device DT and return a bcm_voter handle on success.
> + *
> + * Returns bcm_voter pointer or ERR_PTR() on error. EPROBE_DEFER is returned
> + * when matching bcm voter is yet to be found.
> + */
> +struct bcm_voter *of_bcm_voter_get(struct device *dev, const char *name)
> +{
> + struct bcm_voter *voter = ERR_PTR(-EPROBE_DEFER);
> + struct bcm_voter *temp;
> + struct device_node *np, *node;
> + int idx = 0;
> +
> + if (!dev || !dev->of_node)
> + return ERR_PTR(-ENODEV);
> +
> + np = dev->of_node;
> +
> + if (name) {
> + idx = of_property_match_string(np, "qcom,bcm-voter-names", name);
> + if (idx < 0)
> + return ERR_PTR(idx);
> + }
> +
> + node = of_parse_phandle(np, "qcom,bcm-voters", idx);
> +
> + list_for_each_entry(temp, &bcm_voters, voter_node) {
> + if (temp->np == node)
> + voter = temp;
> + break;

Missing curly braces!

> + }
> +
> + return voter;
> +}
> +EXPORT_SYMBOL_GPL(of_bcm_voter_get);
> +
[..]
> +++ b/drivers/interconnect/qcom/bcm-voter.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#ifndef __DRIVERS_INTERCONNECT_QCOM_ICC_BCM_VOTER_H__
> +#define __DRIVERS_INTERCONNECT_QCOM_ICC_BCM_VOTER_H__

Doesn't match the path - icc-bcm-voter.h vs bcm-voter.h?

> +
> +#include <soc/qcom/cmd-db.h>
> +#include <soc/qcom/rpmh.h>
> +#include <soc/qcom/tcs.h>
> +
> +#include "icc-rpmh.h"
> +
> +#define DEFINE_QBCM(_name, _bcmname, _keepalive, _numnodes, ...) \
> + static struct qcom_icc_bcm _name = { \
> + .name = _bcmname, \
> + .keepalive = _keepalive, \
> + .num_nodes = _numnodes, \
> + .nodes = { __VA_ARGS__ }, \
> + }
> +
> +struct bcm_voter *of_bcm_voter_get(struct device *dev, const char *name);
> +void qcom_icc_bcm_voter_add(struct bcm_voter *voter, struct qcom_icc_bcm *bcm);
> +int qcom_icc_bcm_voter_commit(struct bcm_voter *voter);
> +
> +#endif
> diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
> new file mode 100644
> index 0000000..abe9f1e
> --- /dev/null
> +++ b/drivers/interconnect/qcom/icc-rpmh.c
> @@ -0,0 +1,154 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#include <asm/div64.h>
> +#include <dt-bindings/interconnect/qcom,sdm845.h>
> +#include <linux/interconnect.h>
> +#include <linux/interconnect-provider.h>
> +
> +#include "icc-rpmh.h"
> +#include "bcm-voter.h"
> +
> +/**
> + * qcom_icc_pre_aggregate - cleans up stale values from prior icc_set
> + * @node: icc node to operate on
> + */
> +void qcom_icc_pre_aggregate(struct icc_node *node)
> +{
> + size_t i;
> + struct qcom_icc_node *qn;
> +
> + qn = node->data;
> +
> + for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
> + qn->sum_avg[i] = 0;
> + qn->max_peak[i] = 0;
> + }
> +}
> +EXPORT_SYMBOL_GPL(qcom_icc_pre_aggregate);
> +
> +/**
> + * qcom_icc_aggregate - aggregate bw for buckets indicated by tag
> + * @node: node to aggregate
> + * @tag: tag to indicate which buckets to aggregate
> + * @avg_bw: new bw to sum aggregate
> + * @peak_bw: new bw to max aggregate
> + * @agg_avg: existing aggregate avg bw val
> + * @agg_peak: existing aggregate peak bw val
> + */
> +int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
> + u32 peak_bw, u32 *agg_avg, u32 *agg_peak)

Nit: Please match the open parenthesis.

> +{
> + size_t i;
> + struct qcom_icc_node *qn;
> + struct qcom_icc_provider *qp;
> +
> + qn = node->data;
> + qp = to_qcom_provider(node->provider);
> +
> + if (!tag)
> + tag = QCOM_ICC_TAG_ALWAYS;
> +
> + for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
> + if (tag & BIT(i)) {
> + qn->sum_avg[i] += avg_bw;
> + qn->max_peak[i] = max_t(u32, qn->max_peak[i], peak_bw);
> + }
> + }
> +
> + *agg_avg += avg_bw;
> + *agg_peak = max_t(u32, *agg_peak, peak_bw);
> +
> + for (i = 0; i < qn->num_bcms; i++)
> + qcom_icc_bcm_voter_add(qp->voter, qn->bcms[i]);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_icc_aggregate);
> +
> +/**
> + * qcom_icc_set - set the constraints based on path
> + * @src: source node for the path to set constraints on
> + * @dst: destination node for the path to set constraints on
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
> +{
> + struct qcom_icc_provider *qp;
> + struct icc_node *node;
> + int ret = 0;
> +
> + if (!src)
> + pr_err("src(%d)\n", 0);
> + else
> + pr_err("src(%d)\n", src->id);

pr_err?

> +
> + if (!src)
> + node = dst;
> + else
> + node = src;
> +
> + qp = to_qcom_provider(node->provider);
> +
> + qcom_icc_bcm_voter_commit(qp->voter);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(qcom_icc_set);
[..]
> +++ b/drivers/interconnect/qcom/icc-rpmh.h
> @@ -0,0 +1,150 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#ifndef __DRIVERS_INTERCONNECT_QCOM_ICC_RPMH_H__
> +#define __DRIVERS_INTERCONNECT_QCOM_ICC_RPMH_H__
> +
> +#define to_qcom_provider(_provider) \
> + container_of(_provider, struct qcom_icc_provider, provider)
> +
> +/**
> + * struct qcom_icc_provider - Qualcomm specific interconnect provider
> + * @dev: reference to the NoC device
> + * @bcms: list of bcms that maps to the provider
> + * @num_bcms: number of @bcms
> + * @voter: bcm voter targeted by this provider
> + */
> +struct qcom_icc_provider {
> + struct icc_provider provider;
> + struct device *dev;
> + struct qcom_icc_bcm **bcms;
> + size_t num_bcms;
> + struct bcm_voter *voter;
> +};
> +
> +/**
> + * struct bcm_db - Auxiliary data pertaining to each Bus Clock Manager (BCM)
> + * @unit: divisor used to convert bytes/sec bw value to an RPMh msg
> + * @width: multiplier used to convert bytes/sec bw value to an RPMh msg
> + * @vcd: virtual clock domain that this bcm belongs to
> + * @reserved: reserved field
> + */
> +struct bcm_db {
> + __le32 unit;
> + __le16 width;
> + u8 vcd;
> + u8 reserved;
> +};

The same also exists in clk-rpmh.c. Should we move it to some common place?

> +
> +#define MAX_LINKS 128
> +#define MAX_BCMS 64
> +#define MAX_BCM_PER_NODE 3
> +#define MAX_VCD 10
> +
> +/*
> + * The AMC bucket denotes constraints that are applied to hardware when
> + * icc_set_bw() completes, whereas the WAKE and SLEEP constraints are applied
> + * when the execution environment transitions between active and low power mode.
> + */
> +#define QCOM_ICC_BUCKET_AMC 0
> +#define QCOM_ICC_BUCKET_WAKE 1
> +#define QCOM_ICC_BUCKET_SLEEP 2
> +#define QCOM_ICC_NUM_BUCKETS 3
> +#define QCOM_ICC_TAG_AMC BIT(QCOM_ICC_BUCKET_AMC)
> +#define QCOM_ICC_TAG_WAKE BIT(QCOM_ICC_BUCKET_WAKE)
> +#define QCOM_ICC_TAG_SLEEP BIT(QCOM_ICC_BUCKET_SLEEP)
> +#define QCOM_ICC_TAG_ACTIVE_ONLY (QCOM_ICC_TAG_AMC | QCOM_ICC_TAG_WAKE)
> +#define QCOM_ICC_TAG_ALWAYS (QCOM_ICC_TAG_AMC | QCOM_ICC_TAG_WAKE |\
> + QCOM_ICC_TAG_SLEEP)
> +
> +/**
> + * struct qcom_icc_node - Qualcomm specific interconnect nodes
> + * @name: the node name used in debugfs
> + * @links: an array of nodes where we can go next while traversing
> + * @id: a unique node identifier
> + * @num_links: the total number of @links
> + * @channels: num of channels at this node
> + * @buswidth: width of the interconnect between a node and the bus
> + * @sum_avg: current sum aggregate value of all avg bw requests
> + * @max_peak: current max aggregate value of all peak bw requests
> + * @bcms: list of bcms associated with this logical node
> + * @num_bcms: num of @bcms
> + */
> +struct qcom_icc_node {
> + const char *name;
> + u16 links[MAX_LINKS];
> + u16 id;
> + u16 num_links;
> + u16 channels;
> + u16 buswidth;
> + u64 sum_avg[QCOM_ICC_NUM_BUCKETS];
> + u64 max_peak[QCOM_ICC_NUM_BUCKETS];
> + struct qcom_icc_bcm *bcms[MAX_BCM_PER_NODE];
> + size_t num_bcms;
> +};
> +
> +/**
> + * struct qcom_icc_bcm - Qualcomm specific hardware accelerator nodes
> + * known as Bus Clock Manager (BCM)
> + * @name: the bcm node name used to fetch BCM data from command db
> + * @type: latency or bandwidth bcm
> + * @addr: address offsets used when voting to RPMH
> + * @vote_x: aggregated threshold values, represents sum_bw when @type is bw bcm
> + * @vote_y: aggregated threshold values, represents peak_bw when @type is bw bcm
> + * @dirty: flag used to indicate whether the bcm needs to be committed
> + * @keepalive: flag used to indicate whether a keepalive is required
> + * @aux_data: auxiliary data used when calculating threshold values and
> + * communicating with RPMh
> + * @list: used to link to other bcms when compiling lists for commit
> + * @ws_list: used to keep track of bcms that may transition between wake/sleep
> + * @num_nodes: total number of @num_nodes
> + * @nodes: list of qcom_icc_nodes that this BCM encapsulates
> + */
> +struct qcom_icc_bcm {
> + const char *name;
> + u32 type;
> + u32 addr;
> + u64 vote_x[QCOM_ICC_NUM_BUCKETS];
> + u64 vote_y[QCOM_ICC_NUM_BUCKETS];
> + bool dirty;
> + bool keepalive;
> + struct bcm_db aux_data;
> + struct list_head list;
> + struct list_head ws_list;
> + size_t num_nodes;
> + struct qcom_icc_node *nodes[];
> +};
> +
> +struct qcom_icc_fabric {
> + struct qcom_icc_node **nodes;
> + size_t num_nodes;
> +};

Is this used?

> +
> +struct qcom_icc_desc {
> + struct qcom_icc_node **nodes;
> + size_t num_nodes;
> + struct qcom_icc_bcm **bcms;
> + size_t num_bcms;
> +};
> +
> +#define DEFINE_QNODE(_name, _id, _channels, _buswidth, \
> + _numlinks, ...) \
> + static struct qcom_icc_node _name = { \
> + .id = _id, \
> + .name = #_name, \
> + .channels = _channels, \
> + .buswidth = _buswidth, \
> + .num_links = _numlinks, \
> + .links = { __VA_ARGS__ }, \
> + }
> +
> +int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
> + u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
> +int qcom_icc_set(struct icc_node *src, struct icc_node *dst);
> +int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev);
> +void qcom_icc_pre_aggregate(struct icc_node *node);
> +
> +#endif

Thanks for working on this!

BR,
Georgi

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