[PATCH v2] soc: qcom: Introduce subsystem sleep stats driver
From: Maulik Shah
Date: Thu Sep 05 2019 - 05:17:23 EST
Multiple subsystems like modem, spss, adsp, cdsp present on
Qualcomm Technologies Inc's (QTI) SoCs maintains low power mode
statistics in shared memory (SMEM). Lets add a driver to read
and display this information using sysfs.
Signed-off-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
---
Changes in v2:
- Correct Makefile to use QCOM_SS_SLEEP_STATS config
---
Documentation/ABI/testing/sysfs-power | 10 ++
drivers/soc/qcom/Kconfig | 9 ++
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/subsystem_sleep_stats.c | 146 +++++++++++++++++++++++
4 files changed, 166 insertions(+)
create mode 100644 drivers/soc/qcom/subsystem_sleep_stats.c
diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index 18b7dc929234..1f8bb201246a 100644
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -288,6 +288,16 @@ Description:
writing a "0" (default) to it disables them. Reads from
this file return the current value.
+What: /sys/power/subsystem_sleep/stats
+Date: December 2017
+Contact: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
+Description:
+ The /sys/power/subsystem_sleep/stats file prints the subsystem
+ sleep information on Qualcomm Technologies, Inc. (QTI) SoCs.
+
+ Reading from this file will display subsystem level low power
+ mode statistics.
+
What: /sys/power/resume_offset
Date: April 2018
Contact: Mario Limonciello <mario.limonciello@xxxxxxxx>
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 880cf0290962..da53a96c6cce 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -163,6 +163,15 @@ config QCOM_SMSM
Say yes here to support the Qualcomm Shared Memory State Machine.
The state machine is represented by bits in shared memory.
+config QCOM_SS_SLEEP_STATS
+ tristate "Qualcomm Technologies Inc. Subsystem Sleep Stats driver"
+ depends on QCOM_SMEM
+ help
+ Say y here to enable support for the Qualcomm Technologies Inc (QTI)
+ SS sleep stats driver to read the sleep stats of various subsystems
+ from SMEM. The stats are exported to sysfs. The driver also maintains
+ application processor sleep stats.
+
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 ffe519b0cb66..f00f21b87a22 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_QCOM_SMEM) += smem.o
obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
obj-$(CONFIG_QCOM_SMSM) += smsm.o
+obj-$(CONFIG_QCOM_SS_SLEEP_STATS) += subsystem_sleep_stats.o
obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
obj-$(CONFIG_QCOM_APR) += apr.o
obj-$(CONFIG_QCOM_LLCC) += llcc-slice.o
diff --git a/drivers/soc/qcom/subsystem_sleep_stats.c b/drivers/soc/qcom/subsystem_sleep_stats.c
new file mode 100644
index 000000000000..5379714b6ba4
--- /dev/null
+++ b/drivers/soc/qcom/subsystem_sleep_stats.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, KBUILD_MODNAME
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <linux/soc/qcom/smem.h>
+
+enum subsystem_item_id {
+ MODEM = 605,
+ ADSP,
+ CDSP,
+ SLPI,
+ GPU,
+ DISPLAY,
+};
+
+enum subsystem_pid {
+ PID_APSS = 0,
+ PID_MODEM = 1,
+ PID_ADSP = 2,
+ PID_SLPI = 3,
+ PID_CDSP = 5,
+ PID_GPU = PID_APSS,
+ PID_DISPLAY = PID_APSS,
+};
+
+struct subsystem_data {
+ char *name;
+ enum subsystem_item_id item_id;
+ enum subsystem_pid pid;
+};
+
+static const struct subsystem_data subsystems[] = {
+ {"MODEM", MODEM, PID_MODEM},
+ {"ADSP", ADSP, PID_ADSP},
+ {"CDSP", CDSP, PID_CDSP},
+ {"SLPI", SLPI, PID_SLPI},
+ {"GPU", GPU, PID_GPU},
+ {"DISPLAY", DISPLAY, PID_DISPLAY},
+};
+
+struct subsystem_stats {
+ uint32_t version_id;
+ uint32_t count;
+ uint64_t last_entered;
+ uint64_t last_exited;
+ uint64_t accumulated_duration;
+};
+
+struct subsystem_stats_prv_data {
+ struct kobj_attribute ka;
+ struct kobject *kobj;
+};
+
+static struct subsystem_stats_prv_data *prvdata;
+
+static inline ssize_t subsystem_stats_print(char *prvbuf, ssize_t length,
+ struct subsystem_stats *record,
+ const char *name)
+{
+ return scnprintf(prvbuf, length, "%s\n\tVersion:0x%x\n"
+ "\tSleep Count:0x%x\n"
+ "\tSleep Last Entered At:0x%llx\n"
+ "\tSleep Last Exited At:0x%llx\n"
+ "\tSleep Accumulated Duration:0x%llx\n\n",
+ name, record->version_id, record->count,
+ record->last_entered, record->last_exited,
+ record->accumulated_duration);
+}
+
+static ssize_t subsystem_stats_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ ssize_t length = 0;
+ int i = 0;
+ size_t size = 0;
+ struct subsystem_stats *record = NULL;
+
+ /* Read SMEM data written by other subsystems */
+ for (i = 0; i < ARRAY_SIZE(subsystems); i++) {
+ record = (struct subsystem_stats *) qcom_smem_get(
+ subsystems[i].pid, subsystems[i].item_id, &size);
+
+ if (!IS_ERR_OR_NULL(record) && (PAGE_SIZE - length > 0))
+ length += subsystem_stats_print(buf + length,
+ PAGE_SIZE - length,
+ record,
+ subsystems[i].name);
+ }
+
+ return length;
+}
+
+static int __init subsystem_sleep_stats_init(void)
+{
+ struct kobject *ss_stats_kobj;
+ int ret;
+
+ prvdata = kmalloc(sizeof(*prvdata), GFP_KERNEL);
+ if (!prvdata)
+ return -ENOMEM;
+
+ ss_stats_kobj = kobject_create_and_add("subsystem_sleep",
+ power_kobj);
+ if (!ss_stats_kobj)
+ return -ENOMEM;
+
+ prvdata->kobj = ss_stats_kobj;
+
+ sysfs_attr_init(&prvdata->ka.attr);
+ prvdata->ka.attr.mode = 0444;
+ prvdata->ka.attr.name = "stats";
+ prvdata->ka.show = subsystem_stats_show;
+ prvdata->ka.store = NULL;
+
+ ret = sysfs_create_file(prvdata->kobj, &prvdata->ka.attr);
+ if (ret) {
+ pr_err("sysfs_create_file failed\n");
+ kobject_put(prvdata->kobj);
+ kfree(prvdata);
+ return ret;
+ }
+
+ return ret;
+}
+
+static void __exit subsystem_sleep_stats_exit(void)
+{
+ sysfs_remove_file(prvdata->kobj, &prvdata->ka.attr);
+ kobject_put(prvdata->kobj);
+ kfree(prvdata);
+}
+
+module_init(subsystem_sleep_stats_init);
+module_exit(subsystem_sleep_stats_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc subsystem sleep stats driver");
--
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