[PATCH 7/8] ppc/pnv: using PCI core to do resource assignment

[Gavin Shan <shangw@linux.vnet.ibm.com>]

Currently, the PCI probe flags "PCI_PROBE_ONLY | PCI_REASSIGN_ALL_RSRC"
used on powernv platform. That means the platform has to do the PCI
resource assignment by itself.

The patch changes the PCI probe flag to "PCI_REASSIGN_ALL_RSRC" so
that the PCI core will do the resource assignment. Also, the I/O
and MMIO minimal alignment for P2P bridges have been configured
while doing fixup for the PHBs.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Reviewed-by: Richard Yang <weiyang@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |   46 ++++++++++++-----------------
 1 file changed, 19 insertions(+), 27 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index ed8cf09..1368804 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1130,29 +1130,19 @@ static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { }
  */
 static void __devinit pnv_pci_ioda_fixup_phb(struct pci_controller *hose)
 {
-	resource_size_t size, align;
-	struct pci_bus *child;
-
-	/* Associate PEs per functions */
-	pnv_ioda_setup_PEs(hose->bus);
-
-	/* Calculate all resources */
-	pnv_ioda_calc_bus(hose->bus, IORESOURCE_IO, &size, &align);
-	pnv_ioda_calc_bus(hose->bus, IORESOURCE_MEM, &size, &align);
-
-	/* Apply then to HW */
-	pnv_ioda_update_resources(hose->bus);
-
-	/* Setup DMA */
-	pnv_ioda_setup_dma(hose->private_data);
+	struct pnv_phb *phb = hose->private_data;
+	struct pci_host_bridge *host_bridge;
 
-	/* Configure PCI Express settings */
-	list_for_each_entry(child, &hose->bus->children, node) {
-		struct pci_dev *self = child->self;
-		if (!self)
-			continue;
-		pcie_bus_configure_settings(child, self->pcie_mpss);
-	}
+	host_bridge = pci_bus_host_bridge(hose->bus);
+	host_bridge->io_align_shift = __ffs(phb->ioda.io_segsize);
+	host_bridge->mem_align_shift = __ffs(phb->ioda.m32_segsize);
+	/*
+	 * Note: We do not use the M64 window yet (64-bit MMIO window),
+	 * so we leave the alignment setting alone. In the long run,
+	 * we might use it for prefetchable memory regions in which
+	 * case pmem_align_shift will have to be adjusted as well.
+	 */
+	host_bridge->pmem_align_shift = host_bridge->mem_align_shift;
 }
 
 /*
@@ -1437,15 +1427,17 @@ void __init pnv_pci_init_ioda1_phb(struct device_node *np)
 	/* Setup MSI support */
 	pnv_pci_init_ioda_msis(phb);
 
-	/* We set both PCI_PROBE_ONLY and PCI_REASSIGN_ALL_RSRC. This is an
-	 * odd combination which essentially means that we skip all resource
-	 * fixups and assignments in the generic code, and do it all
-	 * ourselves here
+	/*
+	 * We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here
+	 * to let the PCI core do resource assignment. It's supposed
+	 * that the PCI core will do correct I/O and MMIO alignment
+	 * for the P2P bridge bars so that each PCI bus (excluding
+	 * the child P2P bridges) can form individual PE.
 	 */
 	ppc_md.pcibios_fixup_phb = pnv_pci_ioda_fixup_phb;
 	ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;
 	ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
-	pci_add_flags(PCI_PROBE_ONLY | PCI_REASSIGN_ALL_RSRC);
+	pci_add_flags(PCI_REASSIGN_ALL_RSRC);
 
 	/* Reset IODA tables to a clean state */
 	rc = opal_pci_reset(phb_id, OPAL_PCI_IODA_TABLE_RESET, OPAL_ASSERT_RESET);
-- 
1.7.9.5