[PATCH v3 2/4] soc: qcom: Add SoC sleep stats driver

Maulik Shah
2020-03-06T07:24:06Z

From: Mahesh Sivasubramanian <msivasub@codeaurora.org>

Let's add a driver to read the the stats from remote processor
and export to debugfs.

The driver creates "soc_sleep_stats" directory in debugfs and adds
files for various low power mode available. Below is sample output
with command

cat /sys/kernel/debug/soc_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>
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
---
drivers/soc/qcom/Kconfig | 9 ++
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/soc_sleep_stats.c | 248 +++++++++++++++++++++++++++++++++++++
3 files changed, 258 insertions(+)
create mode 100644 drivers/soc/qcom/soc_sleep_stats.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index d0a73e7..08bc0df3 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -185,6 +185,15 @@ 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
+ 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 9fb35c8..e6bd052 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 00000000..79a14d2
--- /dev/null
+++ b/drivers/soc/qcom/soc_sleep_stats.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2011-2020, 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 MODEM_ITEM_ID 605
+#define ADSP_ITEM_ID 606
+#define CDSP_ITEM_ID 607
+#define SLPI_ITEM_ID 608
+#define GPU_ITEM_ID 609
+#define DISPLAY_ITEM_ID 610
+
+#define PID_APSS 0
+#define PID_MODEM 1
+#define PID_ADSP 2
+#define PID_SLPI 3
+#define PID_CDSP 5
+
+#define NAME_LENGTH 5
+
+#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
+
+struct subsystem_data {
+ const char *name;
+ u32 item_id;
+ u32 pid;
+};
+
+static struct subsystem_data subsystems[] = {
+ { "modem", MODEM_ITEM_ID, PID_MODEM },
+ { "adsp", ADSP_ITEM_ID, PID_ADSP },
+ { "cdsp", CDSP_ITEM_ID, PID_CDSP },
+ { "slpi", SLPI_ITEM_ID, PID_SLPI },
+ { "gpu", GPU_ITEM_ID, PID_APSS },
+ { "display", DISPLAY_ITEM_ID, PID_APSS },
+};
+
+struct stats_config {
+ unsigned int offset_addr;
+ unsigned int num_records;
+ bool appended_stats_avail;
+};
+
+static const struct stats_config *config;
+
+struct soc_sleep_stats_data {
+ phys_addr_t stats_base;
+ resource_size_t stats_size;
+ void __iomem *reg;
+ struct dentry *root;
+};
+
+struct entry {
+ u32 stat_type;
+ u32 count;
+ u64 last_entered_at;
+ u64 last_exited_at;
+ u64 accumulated;
+};
+
+struct appended_entry {
+ u32 client_votes;
+ u32 reserved[3];
+};
+
+static void print_sleep_stats(struct seq_file *s, struct entry *e)
+{
+ seq_printf(s, "Count = %u\n", e->count);
+ seq_printf(s, "Last Entered At = %llu\n", e->last_entered_at);
+ seq_printf(s, "Last Exited At = %llu\n", e->last_exited_at);
+ seq_printf(s, "Accumulated Duration = %llu\n", e->accumulated);
+}
+
+static int subsystem_sleep_stats_show(struct seq_file *s, void *d)
+{
+ struct subsystem_data *subsystem = s->private;
+ struct entry *e;
+
+ e = qcom_smem_get(subsystem->pid, subsystem->item_id, NULL);
+ if (IS_ERR(e))
+ return PTR_ERR(e);
+
+ /*
+ * If a subsystem is in sleep when reading the sleep stats adjust
+ * the accumulated sleep duration to show actual sleep time.
+ */
+ if (e->last_entered_at > e->last_exited_at)
+ e->accumulated += (arch_timer_read_counter()
+ - e->last_entered_at);
+
+ print_sleep_stats(s, e);
+
+ return 0;
+}
+
+static int soc_sleep_stats_show(struct seq_file *s, void *d)
+{
+ void __iomem *reg = s->private;
+ struct entry e;
+
+ e.count = readl_relaxed(reg + COUNT_ADDR);
+ e.last_entered_at = readq_relaxed(reg + LAST_ENTERED_AT_ADDR);
+ e.last_exited_at = readq_relaxed(reg + LAST_EXITED_AT_ADDR);
+ e.accumulated = readq_relaxed(reg + ACCUMULATED_ADDR);
+
+ print_sleep_stats(s, &e);
+
+ if (config->appended_stats_avail) {
+ struct appended_entry ae;
+
+ ae.client_votes = readl_relaxed(reg + CLIENT_VOTES_ADDR);
+ seq_printf(s, "Client_votes = %#x\n", ae.client_votes);
+ }
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(soc_sleep_stats);
+DEFINE_SHOW_ATTRIBUTE(subsystem_sleep_stats);
+
+static void create_debugfs_entries(struct soc_sleep_stats_data *drv)
+{
+ struct entry *e;
+ char stat_type[NAME_LENGTH] = {0};
+ u32 offset, type;
+ int i;
+
+ drv->root = debugfs_create_dir("soc_sleep_stats", NULL);
+
+ for (i = 0; i < config->num_records; i++) {
+ offset = STAT_TYPE_ADDR + (i * sizeof(struct entry));
+
+ if (config->appended_stats_avail)
+ offset += i * sizeof(struct appended_entry);
+
+ type = le32_to_cpu(readl_relaxed(drv->reg + offset));
+ memcpy(stat_type, &type, sizeof(u32));
+ debugfs_create_file(stat_type, 0444, drv->root,
+ drv->reg + offset,
+ &soc_sleep_stats_fops);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(subsystems); i++) {
+ e = qcom_smem_get(subsystems[i].pid, subsystems[i].item_id,
+ NULL);
+
+ if (IS_ERR(e))
+ continue;
+
+ debugfs_create_file(subsystems[i].name, 0444, drv->root,
+ &subsystems[i],
+ &subsystem_sleep_stats_fops);
+ }
+}
+
+static int soc_sleep_stats_probe(struct platform_device *pdev)
+{
+ struct soc_sleep_stats_data *drv;
+ struct resource *res;
+ void __iomem *offset_addr;
+
+ drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
+ if (!drv)
+ return -ENOMEM;
+
+ 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 = devm_ioremap(&pdev->dev,
+ res->start + config->offset_addr,
+ sizeof(u32));
+ if (IS_ERR(offset_addr))
+ return PTR_ERR(offset_addr);
+
+ drv->stats_base = res->start | readl_relaxed(offset_addr);
+ drv->stats_size = resource_size(res);
+ devm_iounmap(&pdev->dev, offset_addr);
+
+ drv->reg = devm_ioremap(&pdev->dev, drv->stats_base, drv->stats_size);
+ if (!drv->reg)
+ return -ENOMEM;
+
+ create_debugfs_entries(drv);
+ platform_set_drvdata(pdev, drv);
+
+ return 0;
+}
+
+static int soc_sleep_stats_remove(struct platform_device *pdev)
+{
+ struct soc_sleep_stats_data *drv = platform_get_drvdata(pdev);
+
+ debugfs_remove_recursive(drv->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");
--
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