netdev - [PATCHv4] cxl: avoid driver data for obtaining cxl_dev

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Message-ID: <20241203162112.5088-1-alucerop@amd.com>
Date: Tue, 3 Dec 2024 16:21:12 +0000
From: <alucerop@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <Jonathan.Cameron@...wei.com>,
	<nifan.cxl@...il.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCHv4] cxl: avoid driver data for obtaining cxl_dev_state reference

From: Alejandro Lucero <alucerop@....com>

CXL Type3 pci driver uses struct device driver_data for keeping
cxl_dev_state reference. Type1/2 drivers are not only about CXL so this
field should not be used when code requires cxl_dev_state to work with
and such a code used for Type2 support.

Change cxl_dvsec_rr_decode for passing cxl_dev_state as a parameter.

Seize the change for removing the unused cxl_port param.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/pci.c        | 6 +++---
 drivers/cxl/cxl.h             | 3 ++-
 drivers/cxl/port.c            | 2 +-
 tools/testing/cxl/test/mock.c | 6 +++---
 4 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 5b46bc46aaa9..420e4be85a1f 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -291,11 +291,11 @@ static int devm_cxl_enable_hdm(struct device *host, struct cxl_hdm *cxlhdm)
 	return devm_add_action_or_reset(host, disable_hdm, cxlhdm);
 }
 
-int cxl_dvsec_rr_decode(struct device *dev, struct cxl_port *port,
+int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
 			struct cxl_endpoint_dvsec_info *info)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
+	struct pci_dev *pdev = to_pci_dev(cxlds->dev);
+	struct device *dev = cxlds->dev;
 	int hdm_count, rc, i, ranges = 0;
 	int d = cxlds->cxl_dvsec;
 	u16 cap, ctrl;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index f6015f24ad38..fdac3ddb8635 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -821,7 +821,8 @@ struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
 				struct cxl_endpoint_dvsec_info *info);
 int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
-int cxl_dvsec_rr_decode(struct device *dev, struct cxl_port *port,
+struct cxl_dev_state;
+int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
 			struct cxl_endpoint_dvsec_info *info);
 
 bool is_cxl_region(struct device *dev);
diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index 24041cf85cfb..66e18fe55826 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -98,7 +98,7 @@ static int cxl_endpoint_port_probe(struct cxl_port *port)
 	struct cxl_port *root;
 	int rc;
 
-	rc = cxl_dvsec_rr_decode(cxlds->dev, port, &info);
+	rc = cxl_dvsec_rr_decode(cxlds, &info);
 	if (rc < 0)
 		return rc;
 
diff --git a/tools/testing/cxl/test/mock.c b/tools/testing/cxl/test/mock.c
index f4ce96cc11d4..4f82716cfc16 100644
--- a/tools/testing/cxl/test/mock.c
+++ b/tools/testing/cxl/test/mock.c
@@ -228,16 +228,16 @@ int __wrap_cxl_hdm_decode_init(struct cxl_dev_state *cxlds,
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_cxl_hdm_decode_init, CXL);
 
-int __wrap_cxl_dvsec_rr_decode(struct device *dev, struct cxl_port *port,
+int __wrap_cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
 			       struct cxl_endpoint_dvsec_info *info)
 {
 	int rc = 0, index;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
-	if (ops && ops->is_mock_dev(dev))
+	if (ops && ops->is_mock_dev(cxlds->dev))
 		rc = 0;
 	else
-		rc = cxl_dvsec_rr_decode(dev, port, info);
+		rc = cxl_dvsec_rr_decode(cxlds, info);
 	put_cxl_mock_ops(index);
 
 	return rc;
-- 
2.17.1