Sainath Grandhi 4ea35c1b79 HV: reimplement PCI device discovery ... Major changes: 1. Correct handling of device multi-function capability We only check function zero for this feature. If it has it, we continue looking at all remaining functions, ignoring those with invalid vendors. The PCI spec says we are not to probe beyond function zero if it does not exist or indicates it is not a multi-function device. 2a. Walk *ALL* buses in the PCI space, however, Before walking the PCI hierarchy, post-processed ACPI DMAR info is parsed and a map is created between all device-scopes across all DRHDs and the corresponding IOMMU index. This map is used at the time of walking the PCI hierarchy. If a BDF that ACRN is currently working on, is found in the above-mentioned map, the BDF device is mapped to the corresponding DRHD in the map. If the BDF were a bridge type, realized with "Header Type" in config space, the BDF device along with all its downstream devices are mapped to the corresponding DRHD in the map. To avoid walking previously visited buses, we maintain a bitmap that stores which bus is walked when we handle Bridge type devices. Once ACPI information is included into ACRN about the PCI-Express Root Complexes / PCI Host Bridges, we can avoid the final loop which probes all remainder buses, and instead jump to the next Host Bridge bus. From prior patches, init_pdev returns the pdev structure it created to the caller. This allows us to complete initialization by updating its drhd_idx to the correct DRHD. v3->v2 Removed the dependency on vt-d module for iterating DRHD units Instead, walks thru the plat_dmar_info. Re-worked the logic to call init_pci_hierarchy just once. Renamed try_init_pci_pdev to pci_init_pdev Fixed MISRA-C deviations v2->v1 Removed multiple returns from skip_device Renamed skip_device to pci_is_skip_device_needed Renamed try_add_pci_device to try_init_pci_pdev Tracked-On: #4134 Signed-off-by: Alexander Merritt <alex.merritt@intel.com> Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>		2019-12-10 09:52:17 +08:00
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pci.c	HV: reimplement PCI device discovery	2019-12-10 09:52:17 +08:00