linux-kernel - [PATCH 2/7] platform/x86/intel/vsec: Enhance and Export intel_vsec_add

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Date:   Wed,  1 Feb 2023 17:07:33 -0800
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     hdegoede@...hat.com, markgross@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        "David E . Box" <david.e.box@...ux.intel.com>
Subject: [PATCH 2/7] platform/x86/intel/vsec: Enhance and Export intel_vsec_add_aux()

Remove static for intel_vsec_add_aux() and export this interface so that
it can be used by other vsec related modules.

This driver creates aux devices by parsing PCI-VSEC, which allows
individual drivers to load on those devices. Those driver may further
create more devices on aux bus by parsing the PCI MMIO region.

For example, TPMI (Topology Aware Register and PM Capsule Interface)
creates device nodes for power management features by parsing MMIO region.

When TPMI driver creates devices, it can reuse existing function
intel_vsec_add_aux() to create aux devices with TPMI device as the parent.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Acked-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel/vsec.c | 16 +++++++++++-----
 drivers/platform/x86/intel/vsec.h |  4 ++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index a82b2a5ed99d..b936fc5776d7 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -138,8 +138,9 @@ static void intel_vsec_dev_release(struct device *dev)
 	kfree(intel_vsec_dev);
 }
 
-static int intel_vsec_add_aux(struct pci_dev *pdev, struct intel_vsec_device *intel_vsec_dev,
-			      const char *name)
+int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
+		       struct intel_vsec_device *intel_vsec_dev,
+		       const char *name)
 {
 	struct auxiliary_device *auxdev = &intel_vsec_dev->auxdev;
 	int ret, id;
@@ -150,9 +151,12 @@ static int intel_vsec_add_aux(struct pci_dev *pdev, struct intel_vsec_device *in
 		return ret;
 	}
 
+	if (!parent)
+		parent = &pdev->dev;
+
 	auxdev->id = ret;
 	auxdev->name = name;
-	auxdev->dev.parent = &pdev->dev;
+	auxdev->dev.parent = parent;
 	auxdev->dev.release = intel_vsec_dev_release;
 
 	ret = auxiliary_device_init(auxdev);
@@ -169,7 +173,7 @@ static int intel_vsec_add_aux(struct pci_dev *pdev, struct intel_vsec_device *in
 		return ret;
 	}
 
-	ret = devm_add_action_or_reset(&pdev->dev, intel_vsec_remove_aux,
+	ret = devm_add_action_or_reset(parent, intel_vsec_remove_aux,
 				       auxdev);
 	if (ret < 0)
 		return ret;
@@ -182,6 +186,7 @@ static int intel_vsec_add_aux(struct pci_dev *pdev, struct intel_vsec_device *in
 
 	return 0;
 }
+EXPORT_SYMBOL_NS_GPL(intel_vsec_add_aux, INTEL_VSEC);
 
 static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *header,
 			      struct intel_vsec_platform_info *info)
@@ -239,7 +244,8 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	else
 		intel_vsec_dev->ida = &intel_vsec_ida;
 
-	return intel_vsec_add_aux(pdev, intel_vsec_dev, intel_vsec_name(header->id));
+	return intel_vsec_add_aux(pdev, NULL, intel_vsec_dev,
+				  intel_vsec_name(header->id));
 }
 
 static bool intel_vsec_walk_header(struct pci_dev *pdev,
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 3deeb05cf394..d02c340fd458 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -40,6 +40,10 @@ struct intel_vsec_device {
 	int num_resources;
 };
 
+int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
+		       struct intel_vsec_device *intel_vsec_dev,
+		       const char *name);
+
 static inline struct intel_vsec_device *dev_to_ivdev(struct device *dev)
 {
 	return container_of(dev, struct intel_vsec_device, auxdev.dev);
-- 
2.31.1