linux-kernel - [RESEND v13 11/25] cxl/pci: Log message if RAS registers are unmapped

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Message-ID: <20251104170305.4163840-12-terry.bowman@amd.com>
Date: Tue, 4 Nov 2025 11:02:51 -0600
From: Terry Bowman <terry.bowman@....com>
To: <dave@...olabs.net>, <jonathan.cameron@...wei.com>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>, <alucerop@....com>, <ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<terry.bowman@....com>
Subject: [RESEND v13 11/25] cxl/pci: Log message if RAS registers are unmapped

The CXL RAS handlers do not currently log if the RAS registers are
unmapped. This is needed in order to help debug CXL error handling. Update
the CXL driver to log a warning message if the RAS register block is
unmapped during RAS error handling.

Signed-off-by: Terry Bowman <terry.bowman@....com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@....com>

---

Chan ges in v12->v13:
- Added Bens review-by
---
 drivers/cxl/core/ras.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c
index 72908f3ced77..0320c391f201 100644
--- a/drivers/cxl/core/ras.c
+++ b/drivers/cxl/core/ras.c
@@ -165,8 +165,10 @@ void cxl_handle_cor_ras(struct device *dev, void __iomem *ras_base)
 	void __iomem *addr;
 	u32 status;
 
-	if (!ras_base)
+	if (!ras_base) {
+		dev_warn_once(dev, "CXL RAS register block is not mapped");
 		return;
+	}
 
 	addr = ras_base + CXL_RAS_CORRECTABLE_STATUS_OFFSET;
 	status = readl(addr);
@@ -204,8 +206,10 @@ bool cxl_handle_ras(struct device *dev, void __iomem *ras_base)
 	u32 status;
 	u32 fe;
 
-	if (!ras_base)
+	if (!ras_base) {
+		dev_warn_once(dev, "CXL RAS register block is not mapped");
 		return false;
+	}
 
 	addr = ras_base + CXL_RAS_UNCORRECTABLE_STATUS_OFFSET;
 	status = readl(addr);
-- 
2.34.1