Ensure Safe Access to PCIe ECAM Space in BSA Tests via ACPI _STA Method Validation #420
Description
During the execution of the BSA test suite, we observed that the test attempts to access the ECAM (Enhanced Configuration Access Mechanism) space of a PCIe instance whose ECAM is OFF. This results in a failure of the test due to the inaccessibility of the configuration space.
To address this issue, we recommend invoking the _STA (Status) method associated with the corresponding ACPI node prior to accessing the ECAM space. This method provides the operational status of the host bridge device, thereby allowing the test to verify whether the device is enabled and accessible before proceeding with any configuration space access attempts.
_STA: This object returns the current status of a device, which can be one of the following: enabled, disabled, or removed.
Reference: https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/06_Device_Configuration/Device_Configuration.html#sta-device-status