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SubjectRe: [PATCH v3 4/6] interconnect: qcom: Consolidate interconnect RPMh support
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Hi Sibi,

Thank you for refreshing this patchset!

On 2/9/20 20:34, Sibi Sankar wrote:
> From: David Dai <daidavid1@codeaurora.org>
>
> 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>
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
> ---
> drivers/interconnect/qcom/Kconfig | 13 +-
> drivers/interconnect/qcom/Makefile | 4 +
> drivers/interconnect/qcom/bcm-voter.c | 366 ++++++++++++++++++++++++++
> drivers/interconnect/qcom/bcm-voter.h | 27 ++
> drivers/interconnect/qcom/icc-rpmh.c | 147 +++++++++++
> drivers/interconnect/qcom/icc-rpmh.h | 149 +++++++++++
> 6 files changed, 705 insertions(+), 1 deletion(-)
> 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 76938ece1658e..08cfd676b4299 100644
> --- a/drivers/interconnect/qcom/Kconfig
> +++ b/drivers/interconnect/qcom/Kconfig
> @@ -5,6 +5,11 @@ config INTERCONNECT_QCOM
> help
> Support for Qualcomm's Network-on-Chip interconnect hardware.
>
> +config INTERCONNECT_QCOM_BCM_VOTER
> + tristate
> + depends on INTERCONNECT_QCOM || COMPILE_TEST
> + depends on QCOM_RPMH && OF

This is not user-selectable, but has a "depends on" lines...

> +
> config INTERCONNECT_QCOM_MSM8916
> tristate "Qualcomm MSM8916 interconnect driver"
> depends on INTERCONNECT_QCOM
> @@ -32,10 +37,16 @@ config INTERCONNECT_QCOM_QCS404
> This is a driver for the Qualcomm Network-on-Chip on qcs404-based
> platforms.
>
> +config INTERCONNECT_QCOM_RPMH
> + tristate
> + depends on INTERCONNECT_QCOM || COMPILE_TEST
> + depends on QCOM_COMMAND_DB
> +
> 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

...and these selects will force a symbol to a value without checking its
dependencies. So i was wondering whether this will cause any problems.

> help
> This is a driver for the Qualcomm Network-on-Chip on sdm845-based
> platforms.
> diff --git a/drivers/interconnect/qcom/Makefile b/drivers/interconnect/qcom/Makefile
> index e8271575e3d8a..d591bb56273b1 100644
[..]
> +static const struct of_device_id bcm_voter_of_match[] = {
> + { .compatible = "qcom,bcm-voter" },
> + { }
> +};
> +
> +static struct platform_driver qcom_icc_bcm_voter_driver = {
> + .probe = qcom_icc_bcm_voter_probe,
> + .driver = {
> + .name = "sdm845_bcm_voter",

Nit: This is not just about sdm845 anymore, so maybe qcom_bcm_voter.

> + .of_match_table = bcm_voter_of_match,
> + },
> +};
> +module_platform_driver(qcom_icc_bcm_voter_driver);
> +
> +MODULE_AUTHOR("David Dai <daidavid1@codeaurora.org>");
> +MODULE_DESCRIPTION("Qualcomm BCM Voter interconnect driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/interconnect/qcom/bcm-voter.h b/drivers/interconnect/qcom/bcm-voter.h
> new file mode 100644
> index 0000000000000..3436673e9f104
> --- /dev/null
[.]
> diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
> new file mode 100644
> index 0000000000000..e9443b50e0b48
> --- /dev/null
> +++ b/drivers/interconnect/qcom/icc-rpmh.c
> @@ -0,0 +1,147 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/interconnect.h>
> +#include <linux/interconnect-provider.h>
> +
> +#include "bcm-voter.h"
> +#include "icc-rpmh.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)
> +{
> + 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;
> +
> + if (!src)
> + node = dst;
> + else
> + node = src;
> +
> + qp = to_qcom_provider(node->provider);
> +
> + qcom_icc_bcm_voter_commit(qp->voter);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_icc_set);
> +
> +/**
> + * qcom_icc_bcm_init - populates bcm aux data and connect qnodes
> + * @bcm: bcm to be initialized
> + * @dev: associated provider device
> + *
> + * Return: 0 on success, or an error code otherwise
> + */
> +int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev)
> +{
> + struct qcom_icc_node *qn;
> + const struct bcm_db *data;
> + size_t data_count;
> + int i;
> +
> + /* BCM is already initialised*/
> + if (bcm->addr)
> + return 0;
> +
> + bcm->addr = cmd_db_read_addr(bcm->name);
> + if (!bcm->addr) {
> + dev_err(dev, "%s could not find RPMh address\n",
> + bcm->name);
> + return -EINVAL;
> + }
> +
> + data = cmd_db_read_aux_data(bcm->name, &data_count);
> + if (IS_ERR(data)) {
> + dev_err(dev, "%s command db read error (%ld)\n",
> + bcm->name, PTR_ERR(data));
> + return PTR_ERR(data);
> + }
> + if (!data_count) {
> + dev_err(dev, "%s command db missing or partial aux data\n",
> + bcm->name);
> + return -EINVAL;
> + }
> +
> + bcm->aux_data.unit = le32_to_cpu(data->unit);
> + bcm->aux_data.width = le16_to_cpu(data->width);
> + bcm->aux_data.vcd = data->vcd;
> + bcm->aux_data.reserved = data->reserved;
> + INIT_LIST_HEAD(&bcm->list);
> + INIT_LIST_HEAD(&bcm->ws_list);
> +
> + /* Link Qnodes to their respective BCMs */
> + for (i = 0; i < bcm->num_nodes; i++) {
> + qn = bcm->nodes[i];
> + qn->bcms[qn->num_bcms] = bcm;
> + qn->num_bcms++;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_icc_bcm_init);

When i tried building this as a module i see the following warning:
WARNING: modpost: missing MODULE_LICENSE() in drivers/interconnect/qcom/icc-rpmh.o

So we may want to include module.h and add MODULE_LICENSE("GPL v2") as specified
in the SPDX tag.

Thanks,
Georgi

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