On 5/9/2023 6:31 PM, Dmitry Baryshkov wrote:
On Tue, 9 May 2023 at 15:27, Souradeep Chowdhury
<quic_schowdhu@xxxxxxxxxxx> wrote:
On 5/9/2023 5:09 PM, Dmitry Baryshkov wrote:
On Tue, 9 May 2023 at 13:53, Souradeep Chowdhury
<quic_schowdhu@xxxxxxxxxxx> wrote:
diff --git a/drivers/soc/qcom/boot_stats.c b/drivers/soc/qcom/boot_stats.c
new file mode 100644
index 000000000000..ca67b6b5d8eb
--- /dev/null
+++ b/drivers/soc/qcom/boot_stats.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+#define TO_MS(timestamp) ((timestamp * 1000) / 32768)
Quoting v4 question, which got no answer:
Some of the platforms DTs define 32KHz clock instead of 32.768 KHz
What should be the divisor in this case?
This is the standard divisor used to calculate the pre_abl and abl times
across most QCOM SoCs. Can you give an example where the sleep_stat
counter has a different frequency?
Following SoCs declare 37000 as sleep_clk frequency:
ipq6018, qdu1000, qru1000, sc7280, sm6125, sm6375, sm8350, sm8450, sm8550.
This might be an error in the dtsi, or might be not.
This sleep_clk is different from the sleep_stats counter of the module
power manager(MPM) which is used to log the timestamps. This driver is
tested and verified with sm8450(waipio) which uses the same
frequency(32768).
+
+/**
+ * struct boot_stats - timestamp information related to boot stats
+ * @abl_start: Time for the starting point of the abl
+ * @abl_end: Time when the kernel starts loading from abl
+ */
+struct boot_stats {
+ u32 abl_start;
+ u32 abl_end;
+} __packed;
+
+struct bs_data {
+ struct boot_stats __iomem *b_stats;
+ struct dentry *dbg_dir;
+};
+
+static void populate_boot_stats(char *abl_str, char *pre_abl_str, struct bs_data *drvdata)
+{
+ u32 abl_time, pre_abl_time;
+
+ abl_time = TO_MS(drvdata->b_stats->abl_end) - TO_MS(drvdata->b_stats->abl_start);
+ sprintf(abl_str, "%u ms", abl_time);
+
+ pre_abl_time = TO_MS(drvdata->b_stats->abl_start);
+ sprintf(pre_abl_str, "%u ms", pre_abl_time);
Another point from v4:
It would be better to move the unit to the file name and include just
the number.
Clarified from your first comment
+}
+
+static int boot_stats_probe(struct platform_device *pdev)
+{
+ char abl_str[20], pre_abl_str[20], *abl, *pre_abl;
+ struct device *bootstat_dev = &pdev->dev;
+ struct bs_data *drvdata;
+
+ drvdata = devm_kzalloc(bootstat_dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return dev_err_probe(bootstat_dev, -ENOMEM, "failed to allocate memory");
+ platform_set_drvdata(pdev, drvdata);
+
+ drvdata->b_stats = devm_of_iomap(bootstat_dev, bootstat_dev->of_node, 0, NULL);
+ if (IS_ERR(drvdata->b_stats))
+ return dev_err_probe(bootstat_dev, PTR_ERR(drvdata->b_stats),
+ "failed to map imem region");
+
+ drvdata->dbg_dir = debugfs_create_dir("qcom_boot_stats", NULL);
+ if (IS_ERR(drvdata->dbg_dir))
+ return dev_err_probe(bootstat_dev, PTR_ERR(drvdata->dbg_dir),
+ "failed to create debugfs directory");
+
+ populate_boot_stats(abl_str, pre_abl_str, drvdata);
+ abl = abl_str;
+ pre_abl = pre_abl_str;
+
+ debugfs_create_str("pre_abl_time", 0400, drvdata->dbg_dir, (char **)&pre_abl);
+ debugfs_create_str("abl_time", 0400, drvdata->dbg_dir, (char **)&abl);
+
+ return 0;
+}
+
+void boot_stats_remove(struct platform_device *pdev)
+{
+ struct bs_data *drvdata = platform_get_drvdata(pdev);
+
+ debugfs_remove_recursive(drvdata->dbg_dir);
+}
+
+static const struct of_device_id boot_stats_dt_match[] = {
+ { .compatible = "qcom,imem-bootstats" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, boot_stats_dt_match);
+
+static struct platform_driver boot_stat_driver = {
+ .probe = boot_stats_probe,
+ .remove_new = boot_stats_remove,
+ .driver = {
+ .name = "qcom-boot-stats",
+ .of_match_table = boot_stats_dt_match,
+ },
+};
+module_platform_driver(boot_stat_driver);
+
+MODULE_DESCRIPTION("Qualcomm Technologies Inc. Boot Stat driver");
+MODULE_LICENSE("GPL");
--
2.17.1
