diff mbox series

[v2,2/3] soc: qcom: qcom_stats: Add QMP support for syncing ddr stats

Message ID 20250521-ddr_stats_-v2-2-2c54ea4fc071@oss.qualcomm.com
State New
Headers show
Series [v2,1/3] soc: qcom: qcom_stats: Add support to read DDR statistic | expand

Commit Message

Maulik Shah (mkshah) May 21, 2025, 8:32 a.m. UTC 
Recent SoCs (SM8450 onwards) require QMP command to be sent before reading
ddr stats. The duration field of ddr stats will get populated only if QMP
command is sent.

Add support to send ddr stats freqsync QMP command.

Signed-off-by: Maulik Shah <maulik.shah@oss.qualcomm.com>
---
 drivers/soc/qcom/qcom_stats.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/soc/qcom/qcom_stats.c b/drivers/soc/qcom/qcom_stats.c
index 6ee73268db1d4f69deaf4ff1ee8cc8e245b76f07..52b0f909bc4a365af77ca7e7fc7f997ce2c2be9a 100644
--- a/drivers/soc/qcom/qcom_stats.c
+++ b/drivers/soc/qcom/qcom_stats.c
@@ -13,6 +13,7 @@ 
 #include <linux/platform_device.h>
 #include <linux/seq_file.h>
 
+#include <linux/soc/qcom/qcom_aoss.h>
 #include <linux/soc/qcom/smem.h>
 #include <clocksource/arm_arch_timer.h>
 
@@ -37,6 +38,8 @@ 
 #define DDR_STATS_TYPE(data)		FIELD_GET(GENMASK(15, 8), data)
 #define DDR_STATS_FREQ(data)		FIELD_GET(GENMASK(31, 16), data)
 
+static struct qmp *qcom_stats_qmp;
+
 struct subsystem_data {
 	const char *name;
 	u32 smem_item;
@@ -188,12 +191,28 @@  static int qcom_ddr_stats_show(struct seq_file *s, void *d)
 	struct ddr_stats_entry data[DDR_STATS_MAX_NUM_MODES];
 	void __iomem *reg = (void __iomem *)s->private;
 	u32 entry_count;
-	int i;
+	int i, ret;
 
 	entry_count = readl_relaxed(reg + DDR_STATS_NUM_MODES_ADDR);
 	if (entry_count > DDR_STATS_MAX_NUM_MODES)
 		return -EINVAL;
 
+	if (qcom_stats_qmp) {
+		/*
+		 * Recent SoCs (SM8450 onwards) do not have duration field
+		 * populated from boot up onwards for both DDR LPM Stats
+		 * and DDR Frequency Stats.
+		 *
+		 * Send QMP message to Always on processor which will
+		 * populate duration field into MSG RAM area.
+		 *
+		 * Sent everytime to read latest data.
+		 */
+		ret = qmp_send(qcom_stats_qmp, "{class: ddr, action: freqsync}");
+		if (ret)
+			return ret;
+	}
+
 	reg += DDR_STATS_ENTRY_START_ADDR;
 	memcpy_fromio(data, reg, sizeof(struct ddr_stats_entry) * entry_count);
 
@@ -310,6 +329,14 @@  static int qcom_stats_probe(struct platform_device *pdev)
 	qcom_create_subsystem_stat_files(root, config);
 	qcom_create_soc_sleep_stat_files(root, reg, d, config);
 	qcom_create_ddr_stat_files(root, reg, config);
+	/*
+	 * QMP is used for DDR stats syncing to MSG RAM for recent SoCs (SM8450 onwards).
+	 * The prior SoCs do not need QMP handle as the required stats are already present
+	 * in MSG RAM, provided the DDR_STATS_MAGIC_KEY matches.
+	 */
+	qcom_stats_qmp = qmp_get(&pdev->dev);
+	if (IS_ERR(qcom_stats_qmp))
+		qcom_stats_qmp = NULL;
 
 	platform_set_drvdata(pdev, root);