Re: [PATCH v9 2/5] soc: qcom: Add SoC sleep stats driver

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Hi,

On 9/25/2021 4:50 AM, Bjorn Andersson wrote:
On Mon 06 Sep 00:28 CDT 2021, 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/soc_sleep_stats.c | 241 +++++++++++++++++++++++++++++++++++++
  3 files changed, 252 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

I know that the rest of the modules here does a bad job and have
completely generic names, but could we rename this "qcom_sleep_stats"
instead?

Sure renamed in v10.


  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
[..]
+static int qcom_soc_sleep_stats_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	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;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return PTR_ERR(res);

You no longer use this "res".

Thanks for catching this, removed in v10.


+
+	reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+	if (!reg)

IS_ERR()

Updated in v10 to use IS_ERR().


+		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_sleep_stats", NULL);
+
+	qcom_create_subsystem_stat_files(root);
+	qcom_create_soc_sleep_stat_files(root, reg, d, config->num_records);
+
+	platform_set_drvdata(pdev, root);
+
+	return 0;
+}
+
+static int qcom_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 = {
+	.num_records = 2,
+	.appended_stats_avail = true,
+};
+
+static const struct stats_config rpmh_data = {
+	.num_records = 3,
+	.appended_stats_avail = false,
+};
+
+static const struct of_device_id qcom_soc_sleep_stats_table[] = {
+	{ .compatible = "qcom,rpm-sleep-stats", .data = &rpm_data },
+	{ .compatible = "qcom,rpmh-sleep-stats", .data = &rpmh_data },
+	{ }
+};

MODULE_DEVICE_TABLE(of, qcom_soc_sleep_stats_table);

Otherwise the module doesn't load automatically.

Regards,
Bjorn

Added MODULE_DEVICE_TABLE in v10.

Thanks,
Maulik


+
+static struct platform_driver soc_sleep_stats = {
+	.probe = qcom_soc_sleep_stats_probe,
+	.remove = qcom_soc_sleep_stats_remove,
+	.driver = {
+		.name = "soc_sleep_stats",
+		.of_match_table = qcom_soc_sleep_stats_table,
+	},
+};
+module_platform_driver(soc_sleep_stats);
+
+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


--
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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