[PATCH 01/22] platform/x86/intel/vsec: Refactor base_addr handling

David E. Box
2026-03-13T01:52:20Z

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@linux.intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
---

Previous change log:
Changes in v7:
- No change

Changes in v6:
- No change

Changes in v5:
- No change

Changes in v4:
- No change

Changes in v3:
- No change

Changes in 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 5059d320edf8..46966edca03b 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