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Date: Mon, 18 Oct 2021 19:45:30 +0530 From: Maulik Shah <mkshah@...eaurora.org> To: Shawn Guo <shawn.guo@...aro.org> Cc: swboyd@...omium.org, mka@...omium.org, evgreen@...omium.org, bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, agross@...nel.org, dianders@...omium.org, linux@...ck-us.net, rnayak@...eaurora.org, lsrao@...eaurora.org, Mahesh Sivasubramanian <msivasub@...eaurora.org>, Lina Iyer <ilina@...eaurora.org> Subject: Re: [PATCH v12 2/5] soc: qcom: Add Sleep stats driver Hi Shawn, On 10/15/2021 7:28 PM, Shawn Guo wrote: > Hi Mahesh, > > Thanks for the work! > > While I tested it good on SDM660 and MSM8939, I have a question > regarding 'vlow' mode below. > > On Wed, Oct 13, 2021 at 12:08:21PM +0530, Maulik Shah wrote: >> From: Mahesh Sivasubramanian <msivasub@...eaurora.org> >> >> 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@...eaurora.org> >> Signed-off-by: Lina Iyer <ilina@...eaurora.org> >> [mkshah: add subsystem sleep stats, create one file for each stat] >> Signed-off-by: Maulik Shah <mkshah@...eaurora.org> >> --- >> 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 >> + >> +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". > > It reports 'vmin' and 'xosd' on MSM8939, 'vmin' and 'vlow' on SDM660. > I know that 'vmin' is VDD Minimization mode, and 'xosd' is XO Shutdown > mode. But I'm not sure about 'vlow' mode. Could you share some > information regarding what this low power mode is, and how it differs > from 'vmin' and 'xosd'? vlow and xosd are same. vmin is xosd plus voltage minimization of chip, memory rails. Thanks, Maulik > > Also I guess XO Shutdown mode is still available on SoCs that report > 'vlow' instead of 'xosd', just like SDM660. Is there any way we can > still check the stats of XO Shutdown mode on these SoCs? Thanks! > > Shawn > >> + */ >> + 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 >> -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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