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Message-ID: <CAGETcx8JgigJpRgjXsG+xChLUPrASRO7BapkYaSrvvTdQKfEuQ@mail.gmail.com>
Date: Wed, 7 Aug 2019 14:21:04 -0700
From: Saravana Kannan <saravanak@...gle.com>
To: Sibi Sankar <sibis@...eaurora.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Georgi Djakov <georgi.djakov@...aro.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
agross@...nel.org, LKML <linux-kernel@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>, linux-arm-msm@...r.kernel.org,
Mark Rutland <mark.rutland@....com>,
Evan Green <evgreen@...omium.org>,
David Dai <daidavid1@...eaurora.org>
Subject: Re: [PATCH 2/2] interconnect: qcom: Add OSM L3 interconnect provider support
On Wed, Aug 7, 2019 at 4:24 AM Sibi Sankar <sibis@...eaurora.org> wrote:
>
> On some Qualcomm SoCs, Operating State Manager (OSM) controls the
> resources of scaling L3 caches. Add a driver to handle bandwidth
> requests to OSM L3 from CPU/GPU.
>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---
> drivers/interconnect/qcom/Kconfig | 7 +
> drivers/interconnect/qcom/Makefile | 2 +
> drivers/interconnect/qcom/osm-l3.c | 292 +++++++++++++++++++++++++++++
> 3 files changed, 301 insertions(+)
> create mode 100644 drivers/interconnect/qcom/osm-l3.c
>
> diff --git a/drivers/interconnect/qcom/Kconfig b/drivers/interconnect/qcom/Kconfig
> index d5e70ebc24108..f6c2a11a1a2c9 100644
> --- a/drivers/interconnect/qcom/Kconfig
> +++ b/drivers/interconnect/qcom/Kconfig
> @@ -5,6 +5,13 @@ config INTERCONNECT_QCOM
> help
> Support for Qualcomm's Network-on-Chip interconnect hardware.
>
> +config INTERCONNECT_QCOM_OSM_L3
> + tristate "Qualcomm OSM L3 interconnect driver"
> + depends on INTERCONNECT_QCOM || COMPILE_TEST
> + help
> + Say y here to support the Operating State Manager (OSM) interconnect
> + driver which controls the scaling of L3 caches on Qualcomm SoCs.
> +
> config INTERCONNECT_QCOM_SDM845
> tristate "Qualcomm SDM845 interconnect driver"
> depends on INTERCONNECT_QCOM
> diff --git a/drivers/interconnect/qcom/Makefile b/drivers/interconnect/qcom/Makefile
> index 1c1cea690f922..9078af5fed109 100644
> --- a/drivers/interconnect/qcom/Makefile
> +++ b/drivers/interconnect/qcom/Makefile
> @@ -1,5 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
>
> +icc-osm-l3-objs := osm-l3.o
> qnoc-sdm845-objs := sdm845.o
>
> +obj-$(CONFIG_INTERCONNECT_QCOM_OSM_L3) += icc-osm-l3.o
> obj-$(CONFIG_INTERCONNECT_QCOM_SDM845) += qnoc-sdm845.o
> diff --git a/drivers/interconnect/qcom/osm-l3.c b/drivers/interconnect/qcom/osm-l3.c
> new file mode 100644
> index 0000000000000..1e7dfce6f4f9b
> --- /dev/null
> +++ b/drivers/interconnect/qcom/osm-l3.c
> @@ -0,0 +1,292 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#include <dt-bindings/interconnect/qcom,osm-l3.h>
> +#include <dt-bindings/interconnect/qcom,sdm845.h>
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/interconnect-provider.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +
> +#define LUT_MAX_ENTRIES 40U
> +#define LUT_SRC GENMASK(31, 30)
> +#define LUT_L_VAL GENMASK(7, 0)
> +#define LUT_ROW_SIZE 32
> +#define CLK_HW_DIV 2
> +
> +/* Register offsets */
> +#define REG_ENABLE 0x0
> +#define REG_FREQ_LUT 0x110
> +#define REG_PERF_STATE 0x920
> +
> +#define OSM_L3_MAX_LINKS 1
> +
> +#define to_qcom_provider(_provider) \
> + container_of(_provider, struct qcom_icc_provider, provider)
> +
> +enum {
> + SDM845_MASTER_OSM_L3_APPS = SLAVE_TCU + 1,
> + SDM845_MASTER_OSM_L3_GPU,
> + SDM845_SLAVE_OSM_L3,
> +};
> +
> +struct qcom_icc_provider {
> + void __iomem *base;
> + unsigned int max_state;
> + unsigned long lut_tables[LUT_MAX_ENTRIES];
> + struct icc_provider provider;
> +};
> +
> +/**
> + * 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
> + * @buswidth: width of the interconnect between a node and the bus
> + */
> +struct qcom_icc_node {
> + const char *name;
> + u16 links[OSM_L3_MAX_LINKS];
> + u16 id;
> + u16 num_links;
> + u16 buswidth;
> +};
> +
> +struct qcom_icc_desc {
> + struct qcom_icc_node **nodes;
> + size_t num_nodes;
> +};
> +
> +#define DEFINE_QNODE(_name, _id, _buswidth, ...) \
> + static struct qcom_icc_node _name = { \
> + .name = #_name, \
> + .id = _id, \
> + .buswidth = _buswidth, \
> + .num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })), \
> + .links = { __VA_ARGS__ }, \
> + }
> +
> +DEFINE_QNODE(osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, SDM845_SLAVE_OSM_L3);
> +DEFINE_QNODE(osm_gpu_l3, SDM845_MASTER_OSM_L3_GPU, 16, SDM845_SLAVE_OSM_L3);
> +DEFINE_QNODE(osm_l3, SDM845_SLAVE_OSM_L3, 16);
> +
> +static struct qcom_icc_node *sdm845_osm_l3_nodes[] = {
> + [MASTER_OSM_L3_APPS] = &osm_apps_l3,
> + [MASTER_OSM_L3_GPU] = &osm_gpu_l3,
> + [SLAVE_OSM_L3] = &osm_l3,
> +};
> +
> +static struct qcom_icc_desc sdm845_osm_l3 = {
> + .nodes = sdm845_osm_l3_nodes,
> + .num_nodes = ARRAY_SIZE(sdm845_osm_l3_nodes),
> +};
> +
> +static int qcom_icc_aggregate(struct icc_node *node, u32 avg_bw,
> + u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
> +{
> + *agg_avg += avg_bw;
> + *agg_peak = max_t(u32, *agg_peak, peak_bw);
> +
> + return 0;
> +}
> +
> +static int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
> +{
> + struct icc_provider *provider;
> + struct qcom_icc_provider *qp;
> + struct qcom_icc_node *qn;
> + struct icc_node *n;
> + unsigned int index;
> + u32 agg_peak = 0;
> + u32 agg_avg = 0;
> + u64 rate;
> +
> + qn = src->data;
> + provider = src->provider;
> + qp = to_qcom_provider(provider);
> +
> + list_for_each_entry(n, &provider->nodes, node_list)
> + qcom_icc_aggregate(n, n->avg_bw, n->peak_bw,
> + &agg_avg, &agg_peak);
> +
> + rate = max(agg_avg, agg_peak);
> + rate = icc_units_to_bps(rate);
> + do_div(rate, qn->buswidth);
> +
> + for (index = 0; index < qp->max_state; index++) {
> + if (qp->lut_tables[index] >= rate)
> + break;
> + }
> +
> + writel_relaxed(index, qp->base + REG_PERF_STATE);
> +
> + return 0;
> +}
> +
> +static int qcom_osm_l3_probe(struct platform_device *pdev)
> +{
> + u32 info, src, lval, i, prev_freq = 0, freq;
> + static unsigned long hw_rate, xo_rate;
> + const struct qcom_icc_desc *desc;
> + struct icc_onecell_data *data;
> + struct icc_provider *provider;
> + struct qcom_icc_node **qnodes;
> + struct qcom_icc_provider *qp;
> + struct icc_node *node;
> + size_t num_nodes;
> + struct clk *clk;
> + int ret;
> +
> + clk = clk_get(&pdev->dev, "xo");
> + if (IS_ERR(clk))
> + return PTR_ERR(clk);
> +
> + xo_rate = clk_get_rate(clk);
> + clk_put(clk);
> +
> + clk = clk_get(&pdev->dev, "alternate");
> + if (IS_ERR(clk))
> + return PTR_ERR(clk);
> +
> + hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
> + clk_put(clk);
> +
> + qp = devm_kzalloc(&pdev->dev, sizeof(*qp), GFP_KERNEL);
> + if (!qp)
> + return -ENOMEM;
> +
> + qp->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(qp->base))
> + return PTR_ERR(qp->base);
> +
> + /* HW should be in enabled state to proceed */
> + if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
> + dev_err(&pdev->dev, "error hardware not enabled\n");
> + return -ENODEV;
> + }
> +
> + for (i = 0; i < LUT_MAX_ENTRIES; i++) {
> + info = readl_relaxed(qp->base + REG_FREQ_LUT +
> + i * LUT_ROW_SIZE);
> + src = FIELD_GET(LUT_SRC, info);
> + lval = FIELD_GET(LUT_L_VAL, info);
> + if (src)
> + freq = xo_rate * lval;
> + else
> + freq = hw_rate;
> +
> + /*
> + * Two of the same frequencies with the same core counts means
> + * end of table
> + */
> + if (i > 0 && prev_freq == freq)
> + break;
> +
> + qp->lut_tables[i] = freq;
> + prev_freq = freq;
> + }
> + qp->max_state = i;
> +
> + desc = of_device_get_match_data(&pdev->dev);
> + if (!desc)
> + return -EINVAL;
> +
> + qnodes = desc->nodes;
> + num_nodes = desc->num_nodes;
> +
> + data = devm_kcalloc(&pdev->dev, num_nodes, sizeof(*node), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + provider = &qp->provider;
> + provider->dev = &pdev->dev;
> + provider->set = qcom_icc_set;
> + provider->aggregate = qcom_icc_aggregate;
> + provider->xlate = of_icc_xlate_onecell;
> + INIT_LIST_HEAD(&provider->nodes);
> + provider->data = data;
> +
> + ret = icc_provider_add(provider);
> + if (ret) {
> + dev_err(&pdev->dev, "error adding interconnect provider\n");
> + return ret;
> + }
> +
> + for (i = 0; i < num_nodes; i++) {
> + size_t j;
> +
> + node = icc_node_create(qnodes[i]->id);
> + if (IS_ERR(node)) {
> + ret = PTR_ERR(node);
> + goto err;
> + }
> +
> + node->name = qnodes[i]->name;
> + node->data = qnodes[i];
> + icc_node_add(node, provider);
> +
> + dev_dbg(&pdev->dev, "registered node %p %s %d\n", node,
> + qnodes[i]->name, node->id);
> +
> + /* populate links */
> + for (j = 0; j < qnodes[i]->num_links; j++)
> + icc_link_create(node, qnodes[i]->links[j]);
> +
> + data->nodes[i] = node;
> + }
> + data->num_nodes = num_nodes;
> +
> + platform_set_drvdata(pdev, qp);
> +
> + return ret;
> +err:
> + list_for_each_entry(node, &provider->nodes, node_list) {
> + icc_node_del(node);
> + icc_node_destroy(node->id);
> + }
> +
> + icc_provider_del(provider);
> + return ret;
> +}
> +
> +static int qcom_osm_l3_remove(struct platform_device *pdev)
> +{
> + struct qcom_icc_provider *qp = platform_get_drvdata(pdev);
> + struct icc_provider *provider = &qp->provider;
> + struct icc_node *n;
> +
> + list_for_each_entry(n, &provider->nodes, node_list) {
> + icc_node_del(n);
> + icc_node_destroy(n->id);
> + }
> +
> + return icc_provider_del(provider);
> +}
> +
> +static const struct of_device_id osm_l3_of_match[] = {
> + { .compatible = "qcom,sdm845-osm-l3", .data = &sdm845_osm_l3 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, osm_l3_of_match);
> +
> +static struct platform_driver osm_l3_driver = {
> + .probe = qcom_osm_l3_probe,
> + .remove = qcom_osm_l3_remove,
> + .driver = {
> + .name = "osm-l3",
> + .of_match_table = osm_l3_of_match,
> + },
> +};
> +module_platform_driver(osm_l3_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm OSM L3 interconnect driver");
> +MODULE_LICENSE("GPL v2");
Did a quick scan of the code and it's not clear how you connect the L3
interconnect provider to the rest of the interconnect. I don't see any
DT or code references to the rest of the interconnects in the system.
If GPU is making a bandwidth request all the way to L3, how do you
make sure the interconnects between GPU and L3 also scale up properly.
-Saravana
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