Hi Maulik, On Wed, Oct 13, 2021 at 12:08:21PM +0530, Maulik Shah wrote: > From: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx> > > Let's add a driver to read the stats from remote processor and > export to debugfs. > > The driver creates "qcom_sleep_stats" directory in debugfs and > adds files for various low power mode available. Below is sample > output with command > > cat /sys/kernel/debug/qcom_sleep_stats/ddr > count = 0 > Last Entered At = 0 > Last Exited At = 0 > Accumulated Duration = 0 > > Signed-off-by: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx> > Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx> > [mkshah: add subsystem sleep stats, create one file for each stat] > Signed-off-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx> > --- > drivers/soc/qcom/Kconfig | 10 ++ > drivers/soc/qcom/Makefile | 1 + > drivers/soc/qcom/qcom_stats.c | 277 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 288 insertions(+) > create mode 100644 drivers/soc/qcom/qcom_stats.c > > diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig > index abfef20..3cf3a6b 100644 > --- a/drivers/soc/qcom/Kconfig > +++ b/drivers/soc/qcom/Kconfig > @@ -199,6 +199,16 @@ config QCOM_SPM > to manage cores, L2 low power modes and to configure the internal > Adaptive Voltage Scaler parameters, where supported. > > +config QCOM_STATS > + tristate "Qualcomm Technologies, Inc. (QTI) Sleep stats driver" > + depends on (ARCH_QCOM && DEBUG_FS) || COMPILE_TEST > + depends on QCOM_SMEM > + help > + Qualcomm Technologies, Inc. (QTI) Sleep stats driver to read > + the shared memory exported by the remote processor related to > + various SoC level low power modes statistics and export to debugfs > + interface. > + > config QCOM_WCNSS_CTRL > tristate "Qualcomm WCNSS control driver" > depends on ARCH_QCOM || COMPILE_TEST > diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile > index 24514c7..70d5de6 100644 > --- a/drivers/soc/qcom/Makefile > +++ b/drivers/soc/qcom/Makefile > @@ -21,6 +21,7 @@ obj-$(CONFIG_QCOM_SMP2P) += smp2p.o > obj-$(CONFIG_QCOM_SMSM) += smsm.o > obj-$(CONFIG_QCOM_SOCINFO) += socinfo.o > obj-$(CONFIG_QCOM_SPM) += spm.o > +obj-$(CONFIG_QCOM_STATS) += qcom_stats.o > obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o > obj-$(CONFIG_QCOM_APR) += apr.o > obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o > diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c > new file mode 100644 > index 0000000..817505b > --- /dev/null > +++ b/drivers/soc/qcom/qcom_stats.c > @@ -0,0 +1,277 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2011-2021, The Linux Foundation. All rights reserved. > + */ > + > +#include <linux/debugfs.h> > +#include <linux/device.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/seq_file.h> > + > +#include <linux/soc/qcom/smem.h> > +#include <clocksource/arm_arch_timer.h> > + > +#define RPM_DYNAMIC_ADDR 0x14 > +#define RPM_DYNAMIC_ADDR_MASK 0xFFFF > + > +#define STAT_TYPE_OFFSET 0x0 > +#define COUNT_OFFSET 0x4 > +#define LAST_ENTERED_AT_OFFSET 0x8 > +#define LAST_EXITED_AT_OFFSET 0x10 > +#define ACCUMULATED_OFFSET 0x18 > +#define CLIENT_VOTES_OFFSET 0x1c >From downstream 'struct msm_rpm_stats_data' [1], it looks that CLIENT_VOTES_OFFSET should be 0x20? Shawn [1] https://source.codeaurora.org/quic/la/kernel/msm-4.19/tree/drivers/soc/qcom/rpm_stats.c?h=kernel.lnx.4.19.r17-rel#n46 > + > +struct subsystem_data { > + const char *name; > + u32 smem_item; > + u32 pid; > +}; > + > +static const struct subsystem_data subsystems[] = { > + { "modem", 605, 1 }, > + { "wpss", 605, 13 }, > + { "adsp", 606, 2 }, > + { "cdsp", 607, 5 }, > + { "slpi", 608, 3 }, > + { "gpu", 609, 0 }, > + { "display", 610, 0 }, > + { "adsp_island", 613, 2 }, > + { "slpi_island", 613, 3 }, > +}; > + > +struct stats_config { > + size_t stats_offset; > + size_t num_records; > + bool appended_stats_avail; > + bool dynamic_offset; > + bool subsystem_stats_in_smem; > +}; > + > +struct stats_data { > + bool appended_stats_avail; > + void __iomem *base; > +}; > + > +struct sleep_stats { > + u32 stat_type; > + u32 count; > + u64 last_entered_at; > + u64 last_exited_at; > + u64 accumulated; > +}; > + > +struct appended_stats { > + u32 client_votes; > + u32 reserved[3]; > +}; > + > +static void qcom_print_stats(struct seq_file *s, const struct sleep_stats *stat) > +{ > + u64 accumulated = stat->accumulated; > + /* > + * If a subsystem is in sleep when reading the sleep stats adjust > + * the accumulated sleep duration to show actual sleep time. > + */ > + if (stat->last_entered_at > stat->last_exited_at) > + accumulated += arch_timer_read_counter() - stat->last_entered_at; > + > + seq_printf(s, "Count: %u\n", stat->count); > + seq_printf(s, "Last Entered At: %llu\n", stat->last_entered_at); > + seq_printf(s, "Last Exited At: %llu\n", stat->last_exited_at); > + seq_printf(s, "Accumulated Duration: %llu\n", accumulated); > +} > + > +static int qcom_subsystem_sleep_stats_show(struct seq_file *s, void *unused) > +{ > + struct subsystem_data *subsystem = s->private; > + struct sleep_stats *stat; > + > + /* Items are allocated lazily, so lookup pointer each time */ > + stat = qcom_smem_get(subsystem->pid, subsystem->smem_item, NULL); > + if (IS_ERR(stat)) > + return -EIO; > + > + qcom_print_stats(s, stat); > + > + return 0; > +} > + > +static int qcom_soc_sleep_stats_show(struct seq_file *s, void *unused) > +{ > + struct stats_data *d = s->private; > + void __iomem *reg = d->base; > + struct sleep_stats stat; > + > + memcpy_fromio(&stat, reg, sizeof(stat)); > + qcom_print_stats(s, &stat); > + > + if (d->appended_stats_avail) { > + struct appended_stats votes; > + > + memcpy_fromio(&votes, reg + CLIENT_VOTES_OFFSET, sizeof(votes)); > + seq_printf(s, "Client Votes: %#x\n", votes.client_votes); > + } > + > + return 0; > +} > + > +DEFINE_SHOW_ATTRIBUTE(qcom_soc_sleep_stats); > +DEFINE_SHOW_ATTRIBUTE(qcom_subsystem_sleep_stats); > + > +static void qcom_create_soc_sleep_stat_files(struct dentry *root, void __iomem *reg, > + struct stats_data *d, > + const struct stats_config *config) > +{ > + char stat_type[sizeof(u32) + 1] = {0}; > + size_t stats_offset = config->stats_offset; > + u32 offset = 0, type; > + int i, j; > + > + /* > + * On RPM targets, stats offset location is dynamic and changes from target > + * to target and sometimes from build to build for same target. > + * > + * In such cases the dynamic address is present at 0x14 offset from base > + * address in devicetree. The last 16bits indicates the stats_offset. > + */ > + if (config->dynamic_offset) { > + stats_offset = readl(reg + RPM_DYNAMIC_ADDR); > + stats_offset &= RPM_DYNAMIC_ADDR_MASK; > + } > + > + for (i = 0; i < config->num_records; i++) { > + d[i].base = reg + offset + stats_offset; > + > + /* > + * Read the low power mode name and create debugfs file for it. > + * The names read could be of below, > + * (may change depending on low power mode supported). > + * For rpmh-sleep-stats: "aosd", "cxsd" and "ddr". > + * For rpm-sleep-stats: "vmin" and "vlow". > + */ > + type = readl(d[i].base); > + for (j = 0; j < sizeof(u32); j++) { > + stat_type[j] = type & 0xff; > + type = type >> 8; > + } > + strim(stat_type); > + debugfs_create_file(stat_type, 0400, root, &d[i], > + &qcom_soc_sleep_stats_fops); > + > + offset += sizeof(struct sleep_stats); > + if (d[i].appended_stats_avail) > + offset += sizeof(struct appended_stats); > + } > +} > + > +static void qcom_create_subsystem_stat_files(struct dentry *root, > + const struct stats_config *config) > +{ > + const struct sleep_stats *stat; > + int i; > + > + if (!config->subsystem_stats_in_smem) > + return; > + > + for (i = 0; i < ARRAY_SIZE(subsystems); i++) { > + stat = qcom_smem_get(subsystems[i].pid, subsystems[i].smem_item, NULL); > + if (IS_ERR(stat)) > + continue; > + > + debugfs_create_file(subsystems[i].name, 0400, root, (void *)&subsystems[i], > + &qcom_subsystem_sleep_stats_fops); > + } > +} > + > +static int qcom_stats_probe(struct platform_device *pdev) > +{ > + void __iomem *reg; > + struct dentry *root; > + const struct stats_config *config; > + struct stats_data *d; > + int i; > + > + config = device_get_match_data(&pdev->dev); > + if (!config) > + return -ENODEV; > + > + reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); > + if (IS_ERR(reg)) > + return -ENOMEM; > + > + d = devm_kcalloc(&pdev->dev, config->num_records, > + sizeof(*d), GFP_KERNEL); > + if (!d) > + return -ENOMEM; > + > + for (i = 0; i < config->num_records; i++) > + d[i].appended_stats_avail = config->appended_stats_avail; > + > + root = debugfs_create_dir("qcom_stats", NULL); > + > + qcom_create_subsystem_stat_files(root, config); > + qcom_create_soc_sleep_stat_files(root, reg, d, config); > + > + platform_set_drvdata(pdev, root); > + > + return 0; > +} > + > +static int qcom_stats_remove(struct platform_device *pdev) > +{ > + struct dentry *root = platform_get_drvdata(pdev); > + > + debugfs_remove_recursive(root); > + > + return 0; > +} > + > +static const struct stats_config rpm_data = { > + .stats_offset = 0, > + .num_records = 2, > + .appended_stats_avail = true, > + .dynamic_offset = true, > + .subsystem_stats_in_smem = false, > +}; > + > +static const struct stats_config rpmh_data = { > + .stats_offset = 0x48, > + .num_records = 3, > + .appended_stats_avail = false, > + .dynamic_offset = false, > + .subsystem_stats_in_smem = true, > +}; > + > +static const struct of_device_id qcom_stats_table[] = { > + { .compatible = "qcom,rpm-stats", .data = &rpm_data }, > + { .compatible = "qcom,rpmh-stats", .data = &rpmh_data }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, qcom_stats_table); > + > +static struct platform_driver qcom_stats = { > + .probe = qcom_stats_probe, > + .remove = qcom_stats_remove, > + .driver = { > + .name = "qcom_stats", > + .of_match_table = qcom_stats_table, > + }, > +}; > + > +static int __init qcom_stats_init(void) > +{ > + return platform_driver_register(&qcom_stats); > +} > +late_initcall(qcom_stats_init); > + > +static void __exit qcom_stats_exit(void) > +{ > + platform_driver_unregister(&qcom_stats); > +} > +module_exit(qcom_stats_exit) > + > +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. (QTI) Stats driver"); > +MODULE_LICENSE("GPL v2"); > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation >
