linux-kernel - [PATCH v9 03/14] drm/msm/dpu: polish log for resource allocation

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Message-Id: <20250506-quad-pipe-upstream-v9-3-f7b273a8cc80@linaro.org>
Date: Tue, 06 May 2025 23:47:33 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Dmitry Baryshkov <lumag@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Jun Nie <jun.nie@...aro.org>
Subject: [PATCH v9 03/14] drm/msm/dpu: polish log for resource allocation

It is more likely that resource allocation may fail in complex usage
case, such as quad-pipe case, than existing usage cases.
A resource type ID is printed on failure in the current implementation,
but the raw ID number is not explicit enough to help easily understand
which resource caused the failure, so add a table to match the type ID
to an human readable resource name and use it in the error print.

Signed-off-by: Jun Nie <jun.nie@...aro.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index 2e296f79cba1437470eeb30900a650f6f4e334b6..2d8ff4b524715c658188fe56bc337e3ffa831c0a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -865,6 +865,21 @@ void dpu_rm_release_all_sspp(struct dpu_global_state *global_state,
 		ARRAY_SIZE(global_state->sspp_to_crtc_id), crtc_id);
 }
 
+static char *dpu_hw_blk_type_name[] = {
+	[DPU_HW_BLK_TOP] = "TOP",
+	[DPU_HW_BLK_SSPP] = "SSPP",
+	[DPU_HW_BLK_LM] = "LM",
+	[DPU_HW_BLK_CTL] = "CTL",
+	[DPU_HW_BLK_PINGPONG] = "pingpong",
+	[DPU_HW_BLK_INTF] = "INTF",
+	[DPU_HW_BLK_WB] = "WB",
+	[DPU_HW_BLK_DSPP] = "DSPP",
+	[DPU_HW_BLK_MERGE_3D] = "merge_3d",
+	[DPU_HW_BLK_DSC] = "DSC",
+	[DPU_HW_BLK_CDM] = "CDM",
+	[DPU_HW_BLK_MAX] = "unknown",
+};
+
 /**
  * dpu_rm_get_assigned_resources - Get hw resources of the given type that are
  *     assigned to this encoder
@@ -946,13 +961,13 @@ int dpu_rm_get_assigned_resources(struct dpu_rm *rm,
 		}
 
 		if (num_blks == blks_size) {
-			DPU_ERROR("More than %d resources assigned to crtc %d\n",
-				  blks_size, crtc_id);
+			DPU_ERROR("More than %d %s assigned to crtc %d\n",
+				  blks_size, dpu_hw_blk_type_name[type], crtc_id);
 			break;
 		}
 		if (!hw_blks[i]) {
-			DPU_ERROR("Allocated resource %d unavailable to assign to crtc %d\n",
-				  type, crtc_id);
+			DPU_ERROR("%s unavailable to assign to crtc %d\n",
+				  dpu_hw_blk_type_name[type], crtc_id);
 			break;
 		}
 		blks[num_blks++] = hw_blks[i];

-- 
2.34.1