From mboxrd@z Thu Jan 1 00:00:00 1970 From: Saravana Kannan Subject: Re: [PATCH 2/2] interconnect: qcom: Add OSM L3 interconnect provider support Date: Wed, 7 Aug 2019 14:21:04 -0700 Message-ID: References: <20190807112432.26521-1-sibis@codeaurora.org> <20190807112432.26521-3-sibis@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: In-Reply-To: <20190807112432.26521-3-sibis@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: Sibi Sankar Cc: Rob Herring , Georgi Djakov , Bjorn Andersson , agross@kernel.org, LKML , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , linux-arm-msm@vger.kernel.org, Mark Rutland , Evan Green , David Dai List-Id: devicetree@vger.kernel.org On Wed, Aug 7, 2019 at 4:24 AM Sibi Sankar 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 > --- > 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 > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#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