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[83.9.30.99]) by smtp.gmail.com with ESMTPSA id h13-20020a2e900d000000b002987088bda4sm2191329ljg.69.2023.04.17.10.37.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Apr 2023 10:37:55 -0700 (PDT) From: Konrad Dybcio Date: Mon, 17 Apr 2023 19:37:53 +0200 Subject: [PATCH v4 2/2] soc: qcom: Introduce RPM master stats driver MIME-Version: 1.0 Message-Id: <20230405-topic-master_stats-v4-2-4217362fcc79@linaro.org> References: <20230405-topic-master_stats-v4-0-4217362fcc79@linaro.org> In-Reply-To: <20230405-topic-master_stats-v4-0-4217362fcc79@linaro.org> To: Andy Gross , Bjorn Andersson , Rob Herring , Krzysztof Kozlowski Cc: Marijn Suijten , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Konrad Dybcio , Manivannan Sadhasivam X-Mailer: b4 0.12.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1681753072; l=7339; i=konrad.dybcio@linaro.org; s=20230215; h=from:subject:message-id; bh=8gsn6U4CGo0S02zD/8MmPyM/NPVm8x4jX2vbho9jzHY=; b=ukvLi+DqJJTWvKsUbVpWpUxASYB/Vc19tPEfA7DmavN+Kvqi8D1LRWFzfD/beFnK0N76/gg5U0gy 8Pb5hZRTBwH5cUuhN/sJTYx3buJwFR7crTOJVa2M5OKKioLYsCRm X-Developer-Key: i=konrad.dybcio@linaro.org; a=ed25519; pk=iclgkYvtl2w05SSXO5EjjSYlhFKsJ+5OSZBjOkQuEms= Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Introduce a driver to query and expose detailed, per-subsystem (as opposed to the existing qcom_stats driver which exposes SoC-wide data) about low power mode states of a given RPM master. That includes the APSS (ARM), MPSS (modem) and other remote cores, depending on the platform configuration. This is a vastly cleaned up and restructured version of a similar driver found in msm-5.4. Signed-off-by: Konrad Dybcio --- drivers/soc/qcom/Kconfig | 11 +++ drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/rpm_master_stats.c | 162 ++++++++++++++++++++++++++++++++++++ 3 files changed, 174 insertions(+) diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig index a491718f8064..e597799e8121 100644 --- a/drivers/soc/qcom/Kconfig +++ b/drivers/soc/qcom/Kconfig @@ -135,6 +135,17 @@ config QCOM_RMTFS_MEM Say y here if you intend to boot the modem remoteproc. +config QCOM_RPM_MASTER_STATS + tristate "Qualcomm RPM Master stats" + depends on ARCH_QCOM || COMPILE_TEST + help + The RPM Master sleep stats driver provides detailed per-subsystem + sleep/wake data, read from the RPM message RAM. It can be used to + assess whether all the low-power modes available are entered as + expected or to check which part of the SoC prevents it from sleeping. + + Say y here if you intend to debug or monitor platform sleep. + config QCOM_RPMH tristate "Qualcomm RPM-Hardened (RPMH) Communication" depends on ARCH_QCOM || COMPILE_TEST diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile index 0f43a88b4894..7349371fdea1 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o qmi_helpers-y += qmi_encdec.o qmi_interface.o obj-$(CONFIG_QCOM_RAMP_CTRL) += ramp_controller.o obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o +obj-$(CONFIG_QCOM_RPM_MASTER_STATS) += rpm_master_stats.o obj-$(CONFIG_QCOM_RPMH) += qcom_rpmh.o qcom_rpmh-y += rpmh-rsc.o qcom_rpmh-y += rpmh.o diff --git a/drivers/soc/qcom/rpm_master_stats.c b/drivers/soc/qcom/rpm_master_stats.c new file mode 100644 index 000000000000..ac87401e2217 --- /dev/null +++ b/drivers/soc/qcom/rpm_master_stats.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved. + * Copyright (c) 2023, Linaro Limited + * + * This driver supports what is known as "Master Stats v2" in Qualcomm + * downstream kernel terms, which seems to be the only version which has + * ever shipped, all the way from 2013 to 2023. + */ + +#include +#include +#include +#include +#include +#include + +struct master_stats_data { + void __iomem *base; + const char *label; +}; + +struct rpm_master_stats { + uint32_t active_cores; + uint32_t num_shutdowns; + uint64_t shutdown_req; + uint64_t wakeup_idx; + uint64_t bringup_req; + uint64_t bringup_ack; + uint32_t wakeup_reason; /* 0 = "rude wakeup", 1 = scheduled wakeup */ + uint32_t last_sleep_trans_dur; + uint32_t last_wake_trans_dur; + + /* Per-subsystem (*not necessarily* SoC-wide) XO shutdown stats */ + uint32_t xo_count; + uint64_t xo_last_enter; + uint64_t last_exit; + uint64_t xo_total_dur; +} __packed; + +static int master_stats_show(struct seq_file *s, void *unused) +{ + struct master_stats_data *data = s->private; + struct rpm_master_stats stat; + + memcpy_fromio(&stat, data->base, sizeof(stat)); + + seq_printf(s, "%s:\n", data->label); + + seq_printf(s, "\tLast shutdown @ %llu\n", stat.shutdown_req); + seq_printf(s, "\tLast bringup req @ %llu\n", stat.bringup_req); + seq_printf(s, "\tLast bringup ack @ %llu\n", stat.bringup_ack); + seq_printf(s, "\tLast wakeup idx: %llu\n", stat.wakeup_idx); + seq_printf(s, "\tLast XO shutdown enter @ %llu\n", stat.xo_last_enter); + seq_printf(s, "\tLast XO shutdown exit @ %llu\n", stat.last_exit); + seq_printf(s, "\tXO total duration: %llu\n", stat.xo_total_dur); + seq_printf(s, "\tLast sleep transition duration: %u\n", stat.last_sleep_trans_dur); + seq_printf(s, "\tLast wake transition duration: %u\n", stat.last_wake_trans_dur); + seq_printf(s, "\tXO shutdown count: %u\n", stat.xo_count); + seq_printf(s, "\tWakeup reason: 0x%x\n", stat.wakeup_reason); + seq_printf(s, "\tShutdown count: %u\n", stat.num_shutdowns); + seq_printf(s, "\tActive cores bitmask: 0x%x\n", stat.active_cores); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(master_stats); + +static int master_stats_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct master_stats_data *data; + struct device_node *msgram_np; + struct dentry *dent, *root; + struct resource res; + int count, i, ret; + + count = of_property_count_strings(dev->of_node, "qcom,master-names"); + if (count < 0) + return count; + + data = devm_kzalloc(dev, count * sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + root = debugfs_create_dir("qcom_rpm_master_stats", NULL); + platform_set_drvdata(pdev, root); + + for (i = 0; i < count; i++) { + msgram_np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", i); + if (!msgram_np) { + debugfs_remove_recursive(root); + return dev_err_probe(dev, -ENODEV, + "Couldn't parse MSG RAM phandle idx %d", i); + } + + /* + * Purposefully skip devm_platform helpers as we're using a + * shared resource. + */ + ret = of_address_to_resource(msgram_np, 0, &res); + of_node_put(msgram_np); + if (ret < 0) { + debugfs_remove_recursive(root); + return ret; + } + + data[i].base = devm_ioremap(dev, res.start, resource_size(&res)); + if (IS_ERR(data[i].base)) { + debugfs_remove_recursive(root); + return dev_err_probe(dev, -EINVAL, + "Could not map the MSG RAM slice idx %d!\n", i); + } + + ret = of_property_read_string_index(dev->of_node, "qcom,master-names", i, + &data[i].label); + if (ret < 0) { + debugfs_remove_recursive(root); + return dev_err_probe(dev, ret, + "Could not read name idx %d!\n", i); + } + + /* + * Generally it's not advised to fail on debugfs errors, but this + * driver's only job is exposing data therein. + */ + dent = debugfs_create_file(data[i].label, 0444, root, + &data[i], &master_stats_fops); + if (IS_ERR(dent)) { + debugfs_remove_recursive(root); + return -EINVAL; + } + } + + device_set_pm_not_required(dev); + + return 0; +} + +static void master_stats_remove(struct platform_device *pdev) +{ + struct dentry *root = platform_get_drvdata(pdev); + + debugfs_remove_recursive(root); +} + +static const struct of_device_id rpm_master_table[] = { + { .compatible = "qcom,rpm-master-stats" }, + { }, +}; + +static struct platform_driver master_stats_driver = { + .probe = master_stats_probe, + .remove_new = master_stats_remove, + .driver = { + .name = "rpm_master_stats", + .of_match_table = rpm_master_table, + }, +}; +module_platform_driver(master_stats_driver); + +MODULE_DESCRIPTION("Qualcomm RPM Master Statistics driver"); +MODULE_LICENSE("GPL");