From: Asahi Lina <lina@asahilina.net>
Date: Tue, 11 Feb 2025 17:59:44 +0000 (-0500)
Subject: soc: apple: rtkit: Check & log more failures
X-Git-Tag: v6.15-rc1~158^2~17^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ca0272d8638a4c50ecc2c63719f81e022d3450f1;p=thirdparty%2Flinux.git

soc: apple: rtkit: Check & log more failures

Check and log the following failures:

* regular messages
* management messages
* failed buffer requests

This helps debugging.

Signed-off-by: Asahi Lina <lina@asahilina.net>
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Link: https://lore.kernel.org/r/20250211-rtkit-more-logging-v1-1-93334e9c1c77@rosenzweig.io
Signed-off-by: Sven Peter <sven@svenpeter.dev>
---

diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
index e6d940292c9fb..f8077a1ec3a42 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -97,12 +97,19 @@ bool apple_rtkit_is_crashed(struct apple_rtkit *rtk)
 }
 EXPORT_SYMBOL_GPL(apple_rtkit_is_crashed);
 
-static void apple_rtkit_management_send(struct apple_rtkit *rtk, u8 type,
+static int apple_rtkit_management_send(struct apple_rtkit *rtk, u8 type,
 					u64 msg)
 {
+	int ret;
+
 	msg &= ~APPLE_RTKIT_MGMT_TYPE;
 	msg |= FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, type);
-	apple_rtkit_send_message(rtk, APPLE_RTKIT_EP_MGMT, msg, NULL, false);
+	ret = apple_rtkit_send_message(rtk, APPLE_RTKIT_EP_MGMT, msg, NULL, false);
+
+	if (ret)
+		dev_err(rtk->dev, "RTKit: Failed to send management message: %d\n", ret);
+
+	return ret;
 }
 
 static void apple_rtkit_management_rx_hello(struct apple_rtkit *rtk, u64 msg)
@@ -295,6 +302,9 @@ static int apple_rtkit_common_rx_get_buffer(struct apple_rtkit *rtk,
 	return 0;
 
 error:
+	dev_err(rtk->dev, "RTKit: failed buffer request for 0x%zx bytes (%d)\n",
+		buffer->size, err);
+
 	buffer->buffer = NULL;
 	buffer->iomem = NULL;
 	buffer->iova = 0;
@@ -588,11 +598,18 @@ int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
 		.msg1 = ep,
 	};
 
-	if (rtk->crashed)
+	if (rtk->crashed) {
+		dev_warn(rtk->dev,
+			 "RTKit: Device is crashed, cannot send message\n");
 		return -EINVAL;
+	}
+
 	if (ep >= APPLE_RTKIT_APP_ENDPOINT_START &&
-	    !apple_rtkit_is_running(rtk))
+	    !apple_rtkit_is_running(rtk)) {
+		dev_warn(rtk->dev,
+			 "RTKit: Endpoint 0x%02x is not running, cannot send message\n", ep);
 		return -EINVAL;
+	}
 
 	/*
 	 * The message will be sent with a MMIO write. We need the barrier
@@ -742,8 +759,10 @@ static int apple_rtkit_set_ap_power_state(struct apple_rtkit *rtk,
 	reinit_completion(&rtk->ap_pwr_ack_completion);
 
 	msg = FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, state);
-	apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_AP_PWR_STATE,
-				    msg);
+	ret = apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_AP_PWR_STATE,
+					  msg);
+	if (ret)
+		return ret;
 
 	ret = apple_rtkit_wait_for_completion(&rtk->ap_pwr_ack_completion);
 	if (ret)
@@ -763,8 +782,10 @@ static int apple_rtkit_set_iop_power_state(struct apple_rtkit *rtk,
 	reinit_completion(&rtk->iop_pwr_ack_completion);
 
 	msg = FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, state);
-	apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE,
-				    msg);
+	ret = apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE,
+					  msg);
+	if (ret)
+		return ret;
 
 	ret = apple_rtkit_wait_for_completion(&rtk->iop_pwr_ack_completion);
 	if (ret)
@@ -865,6 +886,7 @@ EXPORT_SYMBOL_GPL(apple_rtkit_quiesce);
 int apple_rtkit_wake(struct apple_rtkit *rtk)
 {
 	u64 msg;
+	int ret;
 
 	if (apple_rtkit_is_running(rtk))
 		return -EINVAL;
@@ -876,8 +898,10 @@ int apple_rtkit_wake(struct apple_rtkit *rtk)
 	 * will wait for the completion anyway.
 	 */
 	msg = FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, APPLE_RTKIT_PWR_STATE_ON);
-	apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE,
-				    msg);
+	ret = apple_rtkit_management_send(rtk, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE,
+					  msg);
+	if (ret)
+		return ret;
 
 	return apple_rtkit_boot(rtk);
 }