PCI: host-generic: Move bridge allocation outside of pci_host_common_init()

Having the host bridge allocation inside pci_host_common_init() results
in a lot of complexity in the pcie-apple driver (the only direct user
of this function outside of core PCI code).

It forces the allocation of driver-specific tracking structures outside
of the bridge allocation, which in turn requires it to use inefficient
data structures to match the bridge and the private structure as needed.

Instead, let the bridge structure be passed to pci_host_common_init(),
allowing the driver to allocate it together with the private data,
as it is usually intended. The driver can then retrieve the bridge
via the owning device attached to the PCI config window structure.
This allows the pcie-apple driver to be significantly simplified.

Both core and driver code are changed in one go to avoid going via
a transitional interface.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Radu Rendec <rrendec@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Manivannan Sadhasivam <mani@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Krzysztof Wilczyński <kwilczynski@kernel.org>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Link: https://lore.kernel.org/r/86jyzms036.wl-maz@kernel.org
Link: https://patch.msgid.link/20251125102726.865617-1-maz@kernel.org

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/pci/controller/pci-host-common.h b/drivers/pci/controller/pci-host-common.h
index 51c35ec0cf37..b5075d4bd7eb 100644
--- a/drivers/pci/controller/pci-host-common.h
+++ b/drivers/pci/controller/pci-host-common.h
@@ -14,6 +14,7 @@ struct pci_ecam_ops;
 
 int pci_host_common_probe(struct platform_device *pdev);
 int pci_host_common_init(struct platform_device *pdev,
+			 struct pci_host_bridge *bridge,
 			 const struct pci_ecam_ops *ops);
 void pci_host_common_remove(struct platform_device *pdev);