linux-kernel - [PATCH] cxl/hdm: Add debug message for invalid interleave granularity

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Date: Tue,  2 Apr 2024 14:10:16 +0800
From: Huang Ying <ying.huang@...el.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Huang Ying <ying.huang@...el.com>
Subject: [PATCH] cxl/hdm: Add debug message for invalid interleave granularity

There's no debug message for invalid interleave granularity.  This
makes it hard to debug related bugs.  So, this is added in this patch.

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
---
 drivers/cxl/core/hdm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 7d97790b893d..973a27543ed5 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -888,8 +888,12 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
 	}
 	rc = eig_to_granularity(FIELD_GET(CXL_HDM_DECODER0_CTRL_IG_MASK, ctrl),
 				 &cxld->interleave_granularity);
-	if (rc)
+	if (rc) {
+		dev_warn(&port->dev,
+			 "decoder%d.%d: Invalid interleave granularity (ctrl: %#x)\n",
+			 port->id, cxld->id, ctrl);
 		return rc;
+	}
 
 	dev_dbg(&port->dev, "decoder%d.%d: range: %#llx-%#llx iw: %d ig: %d\n",
 		port->id, cxld->id, cxld->hpa_range.start, cxld->hpa_range.end,
-- 
2.39.2