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In order to signal to Graviton [123] systems that a device is ready to be "ejected" (after a detach request is made via the EC2 API) we need to set PCIM_PSTAT_PME to 1 and PCIM_PSTAT_PMEENABLE to 0. We are not aware of any rationale for this requirement beyond "another OS kernel happens to do this", i.e. this is effectively bug-for-bug compatibility. Arguably this should be done by the ACPI _EJ0 method on these systems, but it is not. Create a new ACPI_Q_CLEAR_PME_ON_DETACH quirk and set it in EC2 AMIs, and add the PCI register write to acpi_pci_device_notify_handler when that quirk is set. Reviewed by: jhb MFC after: 1 month Sponsored by: Amazon Differential Revision: https://reviews.freebsd.org/D49146 |
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