linux-kernel - [PATCH v2 3/5] firmware: arm_scmi: Add message dump traces for bad and unexpected replies

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Date: Mon, 25 Mar 2024 20:46:18 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: sudeep.holla@....com,
	Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH v2 3/5] firmware: arm_scmi: Add message dump traces for bad and unexpected replies

Trace also late-timed-out, out-of-order and unexpected/spurious messages.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/firmware/arm_scmi/driver.c  | 10 ++++++++++
 drivers/firmware/arm_scmi/mailbox.c |  4 +++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 7fc1c5b1a2a4..207ed1a52d69 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -861,6 +861,9 @@ scmi_xfer_command_acquire(struct scmi_chan_info *cinfo, u32 msg_hdr)
 			"Message for %d type %d is not expected!\n",
 			xfer_id, msg_type);
 		spin_unlock_irqrestore(&minfo->xfer_lock, flags);
+
+		scmi_bad_message_trace(cinfo, msg_hdr, MSG_UNEXPECTED);
+
 		return xfer;
 	}
 	refcount_inc(&xfer->users);
@@ -885,6 +888,9 @@ scmi_xfer_command_acquire(struct scmi_chan_info *cinfo, u32 msg_hdr)
 		dev_err(cinfo->dev,
 			"Invalid message type:%d for %d - HDR:0x%X  state:%d\n",
 			msg_type, xfer_id, msg_hdr, xfer->state);
+
+		scmi_bad_message_trace(cinfo, msg_hdr, MSG_INVALID);
+
 		/* On error the refcount incremented above has to be dropped */
 		__scmi_xfer_put(minfo, xfer);
 		xfer = ERR_PTR(-EINVAL);
@@ -921,6 +927,9 @@ static void scmi_handle_notification(struct scmi_chan_info *cinfo,
 	if (IS_ERR(xfer)) {
 		dev_err(dev, "failed to get free message slot (%ld)\n",
 			PTR_ERR(xfer));
+
+		scmi_bad_message_trace(cinfo, msg_hdr, MSG_NOMEM);
+
 		scmi_clear_channel(info, cinfo);
 		return;
 	}
@@ -1040,6 +1049,7 @@ void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr, void *priv)
 		break;
 	default:
 		WARN_ONCE(1, "received unknown msg_type:%d\n", msg_type);
+		scmi_bad_message_trace(cinfo, msg_hdr, MSG_UNKNOWN);
 		break;
 	}
 }
diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
index b8d470417e8f..fb0824af7180 100644
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -56,7 +56,9 @@ static void rx_callback(struct mbox_client *cl, void *m)
 	 */
 	if (cl->knows_txdone && !shmem_channel_free(smbox->shmem)) {
 		dev_warn(smbox->cinfo->dev, "Ignoring spurious A2P IRQ !\n");
-		return;
+		return scmi_bad_message_trace(smbox->cinfo,
+				     shmem_read_header(smbox->shmem),
+				     MSG_MBOX_SPURIOUS);
 	}
 
 	scmi_rx_callback(smbox->cinfo, shmem_read_header(smbox->shmem), NULL);
-- 
2.44.0