linux-kernel - [PATCH v9 09/16] cxl/pci: Log message if RAS registers are unmapped

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Message-ID: <20250603172239.159260-10-terry.bowman@amd.com>
Date: Tue, 3 Jun 2025 12:22:32 -0500
From: Terry Bowman <terry.bowman@....com>
To: <PradeepVineshReddy.Kodamati@....com>, <dave@...olabs.net>,
	<jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<ira.weiny@...el.com>, <dan.j.williams@...el.com>, <bhelgaas@...gle.com>,
	<bp@...en8.de>, <ming.li@...omail.com>, <shiju.jose@...wei.com>,
	<dan.carpenter@...aro.org>, <Smita.KoralahalliChannabasappa@....com>,
	<kobayashi.da-06@...itsu.com>, <terry.bowman@....com>, <yanfei.xu@...el.com>,
	<rrichter@....com>, <peterz@...radead.org>, <colyli@...e.de>,
	<uaisheng.ye@...el.com>, <fabio.m.de.francesco@...ux.intel.com>,
	<ilpo.jarvinen@...ux.intel.com>, <yazen.ghannam@....com>,
	<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>
Subject: [PATCH v9 09/16] 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>
---
 drivers/cxl/core/pci.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 78735da7e63d..186a5a20b951 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -670,8 +670,10 @@ static void __cxl_handle_cor_ras(struct device *dev,
 	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);
@@ -714,8 +716,10 @@ static 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