Commit 4c2245bb authored by Gavin Shan's avatar Gavin Shan Committed by Bjorn Helgaas
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powerpc/PCI: Override pcibios_window_alignment()

This patch implements pcibios_window_alignment() so powerpc platforms can
force P2P bridge windows to be at larger alignments than the PCI spec

[bhelgaas: changelog]
Signed-off-by: default avatarGavin Shan <>
Signed-off-by: default avatarBjorn Helgaas <>
parent c121504e
......@@ -214,6 +214,9 @@ struct machdep_calls {
/* Called after scan and before resource survey */
void (*pcibios_fixup_phb)(struct pci_controller *hose);
/* Called during PCI resource reassignment */
resource_size_t (*pcibios_window_alignment)(struct pci_bus *, unsigned long type);
/* Called to shutdown machine specific hardware not already controlled
* by other drivers.
......@@ -99,6 +99,26 @@ void pcibios_free_controller(struct pci_controller *phb)
* The function is used to return the minimal alignment
* for memory or I/O windows of the associated P2P bridge.
* By default, 4KiB alignment for I/O windows and 1MiB for
* memory windows.
resource_size_t pcibios_window_alignment(struct pci_bus *bus,
unsigned long type)
if (ppc_md.pcibios_window_alignment)
return ppc_md.pcibios_window_alignment(bus, type);
* PCI core will figure out the default
* alignment: 4KiB for I/O and 1MiB for
* memory window.
return 1;
static resource_size_t pcibios_io_size(const struct pci_controller *hose)
#ifdef CONFIG_PPC64
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