[PATCH V3 04/16] platform/x86/intel/vsec: Add intel_vsec_register

David E. Box
2023-10-12T02:39:00Z

From: Gayatri Kammela <gayatri.kammela@linux.intel.com>

Add and export intel_vsec_register() to allow the registration of Intel
extended capabilities from other drivers. Add check to look for memory
conflicts before registering a new capability. Add a parent field to
intel_vsec_platform_info to allow specifying the parent device for
device managed cleanup.

Signed-off-by: Gayatri Kammela <gayatri.kammela@linux.intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
V3 - Replace kfree on request_mem_region fail with use of cleanup.h helper.

V2 - New patch splitting previous PATCH 1

drivers/platform/x86/intel/vsec.c | 22 ++++++++++++++++++++--
drivers/platform/x86/intel/vsec.h | 4 ++++
2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index f03ab89ab7c0..1d005077024a 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -157,7 +157,8 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
struct intel_vsec_platform_info *info)
{
struct intel_vsec_device __free(kfree) *intel_vsec_dev = NULL;
- struct resource *res, *tmp;
+ struct resource __free(kfree) *res = NULL;
+ struct resource *tmp;
unsigned long quirks = info->quirks;
int ret, i;

@@ -195,6 +196,12 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
header->offset + i * (header->entry_size * sizeof(u32));
tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
tmp->flags = IORESOURCE_MEM;
+
+ /* Check resource is not in use */
+ if (!request_mem_region(tmp->start, resource_size(tmp), ""))
+ return -EBUSY;
+
+ release_mem_region(tmp->start, resource_size(tmp));
}

intel_vsec_dev->pcidev = pdev;
@@ -207,9 +214,10 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
else
intel_vsec_dev->ida = &intel_vsec_ida;

- ret = intel_vsec_add_aux(pdev, NULL, intel_vsec_dev,
+ ret = intel_vsec_add_aux(pdev, info->parent, intel_vsec_dev,
intel_vsec_name(header->id));

+ no_free_ptr(res);
no_free_ptr(intel_vsec_dev);

return ret;
@@ -329,6 +337,16 @@ static bool intel_vsec_walk_vsec(struct pci_dev *pdev,
return have_devices;
}

+void intel_vsec_register(struct pci_dev *pdev,
+ struct intel_vsec_platform_info *info)
+{
+ if (!pdev || !info)
+ return;
+
+ intel_vsec_walk_header(pdev, info);
+}
+EXPORT_SYMBOL_NS_GPL(intel_vsec_register, INTEL_VSEC);
+
static int intel_vsec_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct intel_vsec_platform_info *info;
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 8b9fad170503..bb8b6452df70 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -69,6 +69,7 @@ enum intel_vsec_quirks {

/* Platform specific data */
struct intel_vsec_platform_info {
+ struct device *parent;
struct intel_vsec_header **headers;
unsigned long caps;
unsigned long quirks;
@@ -99,4 +100,7 @@ static inline struct intel_vsec_device *auxdev_to_ivdev(struct auxiliary_device
{
return container_of(auxdev, struct intel_vsec_device, auxdev);
}
+
+void intel_vsec_register(struct pci_dev *pdev,
+ struct intel_vsec_platform_info *info);
#endif
--
2.34.1