powerpc/powernv: I/O and memory alignment for P2P bridges
The patch implements ppc_md.pcibios_window_alignment for powernv
platform so that the resource reassignment in PCI core will be
done according to the I/O and memory alignment returned from
powernv platform. The alignments returned from powernv platform
is closely depending on the scheme for PE segmenting. Besides,
the patch isn't useful for now, but the subsequent patches will
be working based on it.
[bhelgaas: use pci_pcie_type() since pci_dev.pcie_type was removed]
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index b46e1da..0e7eccc 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1139,6 +1139,44 @@
}
}
+/*
+ * Returns the alignment for I/O or memory windows for P2P
+ * bridges. That actually depends on how PEs are segmented.
+ * For now, we return I/O or M32 segment size for PE sensitive
+ * P2P bridges. Otherwise, the default values (4KiB for I/O,
+ * 1MiB for memory) will be returned.
+ *
+ * The current PCI bus might be put into one PE, which was
+ * create against the parent PCI bridge. For that case, we
+ * needn't enlarge the alignment so that we can save some
+ * resources.
+ */
+static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
+ unsigned long type)
+{
+ struct pci_dev *bridge;
+ struct pci_controller *hose = pci_bus_to_host(bus);
+ struct pnv_phb *phb = hose->private_data;
+ int num_pci_bridges = 0;
+
+ bridge = bus->self;
+ while (bridge) {
+ if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) {
+ num_pci_bridges++;
+ if (num_pci_bridges >= 2)
+ return 1;
+ }
+
+ bridge = bridge->bus->self;
+ }
+
+ /* We need support prefetchable memory window later */
+ if (type & IORESOURCE_MEM)
+ return phb->ioda.m32_segsize;
+
+ return phb->ioda.io_segsize;
+}
+
/* Prevent enabling devices for which we couldn't properly
* assign a PE
*/
@@ -1306,6 +1344,7 @@
*/
ppc_md.pcibios_fixup_phb = pnv_pci_ioda_fixup_phb;
ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
+ ppc_md.pcibios_window_alignment = pnv_pci_window_alignment;
pci_add_flags(PCI_PROBE_ONLY | PCI_REASSIGN_ALL_RSRC);
/* Reset IODA tables to a clean state */