linux-kernel - [PATCH v3 1/6] platform/x86/intel/vsec: Refactor base

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Message-ID: <20260122030903.3247167-2-david.e.box@linux.intel.com>
Date: Wed, 21 Jan 2026 19:08:56 -0800
From: "David E. Box" <david.e.box@...ux.intel.com>
To: thomas.hellstrom@...ux.intel.com,
	rodrigo.vivi@...el.com,
	irenic.rajneesh@...il.com,
	ilpo.jarvinen@...ux.intel.com,
	srinivas.pandruvada@...ux.intel.com,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	xi.pardee@...ux.intel.com
Cc: "David E. Box" <david.e.box@...ux.intel.com>,
	hansg@...nel.org,
	linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org
Subject: [PATCH v3 1/6] platform/x86/intel/vsec: Refactor base_addr handling

The base_addr field in intel_vsec_platform_info was originally added to
support devices that emulate PCI VSEC capabilities in MMIO. Previously,
the code would check at registration time whether base_addr was set,
falling back to the PCI BAR if not.

Refactor this by making base_addr an explicit function parameter. This
clarifies ownership of the value and removes conditional logic from
intel_vsec_add_dev(). It also enables making intel_vsec_platform_info
const in a later patch, since the function no longer needs to write to
info->base_addr.

No functional change intended.

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
v3:
  - No change

v2:
  - Use pci_resource_start() macro instead of direct pdev->resource array access
    (suggested by Ilpo)

 drivers/platform/x86/intel/vsec.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index ecfc7703f201..a10e2c65205c 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -271,14 +271,13 @@ 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,
-			      unsigned long cap_id)
+			      unsigned long cap_id, u64 base_addr)
 {
 	struct intel_vsec_device __free(kfree) *intel_vsec_dev = NULL;
 	struct resource __free(kfree) *res = NULL;
 	struct resource *tmp;
 	struct device *parent;
 	unsigned long quirks = info->quirks;
-	u64 base_addr;
 	int i;
 
 	if (info->parent)
@@ -310,11 +309,6 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	if (quirks & VSEC_QUIRK_TABLE_SHIFT)
 		header->offset >>= TABLE_OFFSET_SHIFT;
 
-	if (info->base_addr)
-		base_addr = info->base_addr;
-	else
-		base_addr = pdev->resource[header->tbir].start;
-
 	/*
 	 * The DVSEC/VSEC contains the starting offset and count for a block of
 	 * discovery tables. Create a resource array of these tables to the
@@ -412,7 +406,8 @@ static int get_cap_id(u32 header_id, unsigned long *cap_id)
 
 static int intel_vsec_register_device(struct pci_dev *pdev,
 				      struct intel_vsec_header *header,
-				      struct intel_vsec_platform_info *info)
+				      struct intel_vsec_platform_info *info,
+				      u64 base_addr)
 {
 	const struct vsec_feature_dependency *consumer_deps;
 	struct vsec_priv *priv;
@@ -428,7 +423,7 @@ static int intel_vsec_register_device(struct pci_dev *pdev,
 	 * For others using the exported APIs, add the device directly.
 	 */
 	if (!pci_match_id(intel_vsec_pci_ids, pdev))
-		return intel_vsec_add_dev(pdev, header, info, cap_id);
+		return intel_vsec_add_dev(pdev, header, info, cap_id, base_addr);
 
 	priv = pci_get_drvdata(pdev);
 	if (priv->state[cap_id] == STATE_REGISTERED ||
@@ -444,7 +439,7 @@ static int intel_vsec_register_device(struct pci_dev *pdev,
 
 	consumer_deps = get_consumer_dependencies(priv, cap_id);
 	if (!consumer_deps || suppliers_ready(priv, consumer_deps, cap_id)) {
-		ret = intel_vsec_add_dev(pdev, header, info, cap_id);
+		ret = intel_vsec_add_dev(pdev, header, info, cap_id, base_addr);
 		if (ret)
 			priv->state[cap_id] = STATE_SKIP;
 		else
@@ -464,7 +459,7 @@ static bool intel_vsec_walk_header(struct pci_dev *pdev,
 	int ret;
 
 	for ( ; *header; header++) {
-		ret = intel_vsec_register_device(pdev, *header, info);
+		ret = intel_vsec_register_device(pdev, *header, info, info->base_addr);
 		if (!ret)
 			have_devices = true;
 	}
@@ -512,7 +507,8 @@ static bool intel_vsec_walk_dvsec(struct pci_dev *pdev,
 		pci_read_config_dword(pdev, pos + PCI_DVSEC_HEADER2, &hdr);
 		header.id = PCI_DVSEC_HEADER2_ID(hdr);
 
-		ret = intel_vsec_register_device(pdev, &header, info);
+		ret = intel_vsec_register_device(pdev, &header, info,
+						 pci_resource_start(pdev, header.tbir));
 		if (ret)
 			continue;
 
@@ -557,7 +553,8 @@ static bool intel_vsec_walk_vsec(struct pci_dev *pdev,
 		header.tbir = INTEL_DVSEC_TABLE_BAR(table);
 		header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
 
-		ret = intel_vsec_register_device(pdev, &header, info);
+		ret = intel_vsec_register_device(pdev, &header, info,
+						 pci_resource_start(pdev, header.tbir));
 		if (ret)
 			continue;
 
-- 
2.43.0