From: Lijo Lazar <lijo.lazar@amd.com>
Date: Wed, 17 Dec 2025 11:09:11 +0000 (+0530)
Subject: drm/amd/pm: Add debug message callback
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f0d5ecae0f5604c87075237a919b68d38cc9500;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/pm: Add debug message callback

Add callback in message control to send message through debug mailbox.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
index e88fdd65e1cd..84b50820a613 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
+++ b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
@@ -557,6 +557,9 @@ struct cmn2asic_mapping {
 #define SMU_MSG_FLAG_ASYNC	BIT(0) /* Async send - skip post-poll */
 #define SMU_MSG_FLAG_LOCK_HELD	BIT(1) /* Caller holds ctl->lock */
 
+/* smu_msg_ctl flags */
+#define SMU_MSG_CTL_DEBUG_MAILBOX	BIT(0) /* Debug mailbox supported */
+
 struct smu_msg_ctl;
 /**
  * struct smu_msg_config - IP-level register configuration
@@ -564,12 +567,18 @@ struct smu_msg_ctl;
  * @resp_reg: Response register offset
  * @arg_regs: Argument register offsets (up to SMU_MSG_MAX_ARGS)
  * @num_arg_regs: Number of argument registers available
+ * @debug_msg_reg: Debug message register offset
+ * @debug_resp_reg: Debug response register offset
+ * @debug_param_reg: Debug parameter register offset
  */
 struct smu_msg_config {
 	u32 msg_reg;
 	u32 resp_reg;
 	u32 arg_regs[SMU_MSG_MAX_ARGS];
 	int num_arg_regs;
+	u32 debug_msg_reg;
+	u32 debug_resp_reg;
+	u32 debug_param_reg;
 };
 
 /**
@@ -597,11 +606,13 @@ struct smu_msg_args {
  * @send_msg: send message protocol
  * @wait_response: wait for response (for split send/wait cases)
  * @decode_response: Convert response register value to errno
+ * @send_debug_msg: send debug message
  */
 struct smu_msg_ops {
 	int (*send_msg)(struct smu_msg_ctl *ctl, struct smu_msg_args *args);
 	int (*wait_response)(struct smu_msg_ctl *ctl, u32 timeout_us);
 	int (*decode_response)(u32 resp);
+	int (*send_debug_msg)(struct smu_msg_ctl *ctl, u32 msg, u32 param);
 };
 
 /**
@@ -617,6 +628,7 @@ struct smu_msg_ctl {
 	const struct smu_msg_ops *ops;
 	const struct cmn2asic_msg_mapping *message_map;
 	u32 default_timeout;
+	u32 flags;
 };
 
 struct stb_context {
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c b/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
index 6b673eefc7b1..f639d3636d30 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
@@ -83,6 +83,25 @@ static const char *smu_get_message_name(struct smu_context *smu,
 
 #define SMU_RESP_UNEXP (~0U)
 
+static int smu_msg_v1_send_debug_msg(struct smu_msg_ctl *ctl, u32 msg, u32 param)
+{
+	struct amdgpu_device *adev = ctl->smu->adev;
+	struct smu_msg_config *cfg = &ctl->config;
+
+	if (!(ctl->flags & SMU_MSG_CTL_DEBUG_MAILBOX))
+		return -EOPNOTSUPP;
+
+	mutex_lock(&ctl->lock);
+
+	WREG32(cfg->debug_param_reg, param);
+	WREG32(cfg->debug_msg_reg, msg);
+	WREG32(cfg->debug_resp_reg, 0);
+
+	mutex_unlock(&ctl->lock);
+
+	return 0;
+}
+
 static int __smu_cmn_send_debug_msg(struct smu_context *smu,
 			       u32 msg,
 			       u32 param)
@@ -541,6 +560,7 @@ const struct smu_msg_ops smu_msg_v1_ops = {
 	.send_msg = smu_msg_v1_send_msg,
 	.wait_response = smu_msg_v1_wait_response,
 	.decode_response = smu_msg_v1_decode_response,
+	.send_debug_msg = smu_msg_v1_send_debug_msg,
 };
 
 int smu_msg_wait_response(struct smu_msg_ctl *ctl, u32 timeout_us)