drivers/soc/qcom/rpm_master_stats.c

Source file repositories/reference/linux-study-clean/drivers/soc/qcom/rpm_master_stats.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/qcom/rpm_master_stats.c
Extension
.c
Size
4808 bytes
Lines
168
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct master_stats_data {
	void __iomem *base;
	const char *label;
};

struct rpm_master_stats {
	u32 active_cores;
	u32 num_shutdowns;
	u64 shutdown_req;
	u64 wakeup_idx;
	u64 bringup_req;
	u64 bringup_ack;
	u32 wakeup_reason; /* 0 = "rude wakeup", 1 = scheduled wakeup */
	u32 last_sleep_trans_dur;
	u32 last_wake_trans_dur;

	/* Per-subsystem (*not necessarily* SoC-wide) XO shutdown stats */
	u32 xo_count;
	u64 xo_last_enter;
	u64 last_exit;
	u64 xo_total_dur;
} __packed;

static int master_stats_show(struct seq_file *s, void *unused)
{
	struct master_stats_data *data = s->private;
	struct rpm_master_stats stat;

	memcpy_fromio(&stat, data->base, sizeof(stat));

	seq_printf(s, "%s:\n", data->label);

	seq_printf(s, "\tLast shutdown @ %llu\n", stat.shutdown_req);
	seq_printf(s, "\tLast bringup req @ %llu\n", stat.bringup_req);
	seq_printf(s, "\tLast bringup ack @ %llu\n", stat.bringup_ack);
	seq_printf(s, "\tLast wakeup idx: %llu\n", stat.wakeup_idx);
	seq_printf(s, "\tLast XO shutdown enter @ %llu\n", stat.xo_last_enter);
	seq_printf(s, "\tLast XO shutdown exit @ %llu\n", stat.last_exit);
	seq_printf(s, "\tXO total duration: %llu\n", stat.xo_total_dur);
	seq_printf(s, "\tLast sleep transition duration: %u\n", stat.last_sleep_trans_dur);
	seq_printf(s, "\tLast wake transition duration: %u\n", stat.last_wake_trans_dur);
	seq_printf(s, "\tXO shutdown count: %u\n", stat.xo_count);
	seq_printf(s, "\tWakeup reason: 0x%x\n", stat.wakeup_reason);
	seq_printf(s, "\tShutdown count: %u\n", stat.num_shutdowns);
	seq_printf(s, "\tActive cores bitmask: 0x%x\n", stat.active_cores);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(master_stats);

static int master_stats_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct master_stats_data *data;
	struct device_node *msgram_np;
	struct dentry *dent, *root;
	struct resource res;
	int count, i, ret;

	count = of_property_count_strings(dev->of_node, "qcom,master-names");
	if (count < 0)
		return count;

	data = devm_kcalloc(dev, count, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	root = debugfs_create_dir("qcom_rpm_master_stats", NULL);
	platform_set_drvdata(pdev, root);

	for (i = 0; i < count; i++) {
		msgram_np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", i);
		if (!msgram_np) {
			debugfs_remove_recursive(root);
			return dev_err_probe(dev, -ENODEV,
					     "Couldn't parse MSG RAM phandle idx %d", i);
		}

		/*
		 * Purposefully skip devm_platform helpers as we're using a
		 * shared resource.
		 */
		ret = of_address_to_resource(msgram_np, 0, &res);
		of_node_put(msgram_np);
		if (ret < 0) {
			debugfs_remove_recursive(root);
			return ret;
		}

		data[i].base = devm_ioremap(dev, res.start, resource_size(&res));

Annotation

Implementation Notes