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Subject[PATCH v6 2/4] soc: qcom: Add SoC sleep stats driver
Date
From: Mahesh Sivasubramanian <msivasub@codeaurora.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@codeaurora.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
[mkshah: add subsystem sleep stats, create one file for each stat]
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
---
drivers/soc/qcom/Kconfig | 10 ++
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/soc_sleep_stats.c | 258 +++++++++++++++++++++++++++++++++++++
3 files changed, 269 insertions(+)
create mode 100644 drivers/soc/qcom/soc_sleep_stats.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 79b568f..e80b63a 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -190,6 +190,16 @@ config QCOM_SOCINFO
Say yes here to support the Qualcomm socinfo driver, providing
information about the SoC to user space.

+config QCOM_SOC_SLEEP_STATS
+ tristate "Qualcomm Technologies, Inc. (QTI) SoC sleep stats driver"
+ depends on ARCH_QCOM && DEBUG_FS || COMPILE_TEST
+ depends on QCOM_SMEM
+ help
+ Qualcomm Technologies, Inc. (QTI) SoC 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 ad675a6..5f30d74 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
obj-$(CONFIG_QCOM_SOCINFO) += socinfo.o
+obj-$(CONFIG_QCOM_SOC_SLEEP_STATS) += soc_sleep_stats.o
obj-$(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/soc_sleep_stats.c b/drivers/soc/qcom/soc_sleep_stats.c
new file mode 100644
index 0000000..66df638
--- /dev/null
+++ b/drivers/soc/qcom/soc_sleep_stats.c
@@ -0,0 +1,258 @@
+// 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 STAT_TYPE_ADDR 0x0
+#define COUNT_ADDR 0x4
+#define LAST_ENTERED_AT_ADDR 0x8
+#define LAST_EXITED_AT_ADDR 0x10
+#define ACCUMULATED_ADDR 0x18
+#define CLIENT_VOTES_ADDR 0x1c
+
+#define STAT_OFFSET(record_no, type) (((record_no)*(sizeof(struct sleep_stats))) + (type))
+#define APPENDED_STAT_OFFSET(record_no) ((record_no)*(sizeof(struct appended_stats)))
+
+struct subsystem_data {
+ const char *name;
+ u32 smem_item;
+ u32 pid;
+};
+
+static const struct subsystem_data subsystems[] = {
+ { "modem", 605, 1 },
+ { "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 {
+ u32 offset_addr;
+ u32 num_records;
+ bool appended_stats_avail;
+};
+
+struct stats_prv_data {
+ bool appended_stats_avail;
+ void __iomem *reg;
+};
+
+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 print_sleep_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 subsystem_sleep_stats_show(struct seq_file *s, void *d)
+{
+ struct subsystem_data *subsystem = s->private;
+ struct sleep_stats *stat;
+
+ /*
+ * Saving this pointer during probe may not help in cases like
+ * subsystem restart, beside not each subsystem is a remote processor
+ * for e.g display for which we can get start and stop notification
+ *
+ * Lookup smem pointer each time to keep it simple.
+ */
+ stat = qcom_smem_get(subsystem->pid, subsystem->smem_item, NULL);
+ if (IS_ERR(stat))
+ return PTR_ERR(stat);
+
+ print_sleep_stats(s, stat);
+
+ return 0;
+}
+
+static int soc_sleep_stats_show(struct seq_file *s, void *d)
+{
+ struct stats_prv_data *prv_data = s->private;
+ void __iomem *reg = prv_data->reg;
+ struct sleep_stats stat;
+
+ stat.count = readl(reg + COUNT_ADDR);
+ stat.last_entered_at = readq(reg + LAST_ENTERED_AT_ADDR);
+ stat.last_exited_at = readq(reg + LAST_EXITED_AT_ADDR);
+ stat.accumulated = readq(reg + ACCUMULATED_ADDR);
+
+ print_sleep_stats(s, &stat);
+
+ if (prv_data->appended_stats_avail) {
+ struct appended_stats app_stat;
+
+ app_stat.client_votes = readl(reg + CLIENT_VOTES_ADDR);
+ seq_printf(s, "Client_votes = %#x\n", app_stat.client_votes);
+ }
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(soc_sleep_stats);
+DEFINE_SHOW_ATTRIBUTE(subsystem_sleep_stats);
+
+static struct dentry *create_debugfs_entries(void __iomem *reg,
+ struct stats_prv_data *prv_data,
+ u32 num_records)
+{
+ struct dentry *root;
+ struct sleep_stats *stat;
+ char stat_type[sizeof(u32)] = {0};
+ u32 offset, type;
+ int i;
+
+ root = debugfs_create_dir("qcom_sleep_stats", NULL);
+
+ for (i = 0; i < num_records; i++) {
+ offset = STAT_OFFSET(i, STAT_TYPE_ADDR);
+
+ if (prv_data[i].appended_stats_avail)
+ offset += APPENDED_STAT_OFFSET(i);
+
+ prv_data[i].reg = reg + offset;
+
+ type = readl(prv_data[i].reg);
+ memcpy_fromio(stat_type, &type, sizeof(u32));
+ strim(stat_type);
+ debugfs_create_file(stat_type, 0400, root,
+ &prv_data[i],
+ &soc_sleep_stats_fops);
+ }
+
+ 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],
+ &subsystem_sleep_stats_fops);
+ }
+
+ return root;
+}
+
+static int soc_sleep_stats_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ void __iomem *reg;
+ void __iomem *offset_addr;
+ phys_addr_t stats_base;
+ resource_size_t stats_size;
+ struct dentry *root;
+ const struct stats_config *config;
+ struct stats_prv_data *prv_data;
+ int i;
+
+ config = device_get_match_data(&pdev->dev);
+ if (!config)
+ return -ENODEV;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return PTR_ERR(res);
+
+ offset_addr = ioremap(res->start + config->offset_addr, sizeof(u32));
+ if (IS_ERR(offset_addr))
+ return PTR_ERR(offset_addr);
+
+ stats_base = res->start | readl_relaxed(offset_addr);
+ stats_size = resource_size(res);
+ iounmap(offset_addr);
+
+ reg = devm_ioremap(&pdev->dev, stats_base, stats_size);
+ if (!reg)
+ return -ENOMEM;
+
+ prv_data = devm_kcalloc(&pdev->dev, config->num_records,
+ sizeof(struct stats_prv_data), GFP_KERNEL);
+ if (!prv_data)
+ return -ENOMEM;
+
+ for (i = 0; i < config->num_records; i++)
+ prv_data[i].appended_stats_avail = config->appended_stats_avail;
+
+ root = create_debugfs_entries(reg, prv_data, config->num_records);
+ platform_set_drvdata(pdev, root);
+
+ return 0;
+}
+
+static int soc_sleep_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 = {
+ .offset_addr = 0x14,
+ .num_records = 2,
+ .appended_stats_avail = true,
+};
+
+static const struct stats_config rpmh_data = {
+ .offset_addr = 0x4,
+ .num_records = 3,
+ .appended_stats_avail = false,
+};
+
+static const struct of_device_id soc_sleep_stats_table[] = {
+ { .compatible = "qcom,rpm-sleep-stats", .data = &rpm_data },
+ { .compatible = "qcom,rpmh-sleep-stats", .data = &rpmh_data },
+ { }
+};
+
+static struct platform_driver soc_sleep_stats_driver = {
+ .probe = soc_sleep_stats_probe,
+ .remove = soc_sleep_stats_remove,
+ .driver = {
+ .name = "soc_sleep_stats",
+ .of_match_table = soc_sleep_stats_table,
+ },
+};
+module_platform_driver(soc_sleep_stats_driver);
+
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. (QTI) SoC Sleep 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
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