powerpc/powernv: IO and M32 mapping based on PCI device resources

Currently, the IO and M32 segments are mapped to the corresponding
PE based on the windows of the parent bridge of PE's primary bus.
It's not going to work when the windows of root port or upstream
port of the PCIe switch behind root port are extended to PHB's
apertures in order to support hotplug in subsequent patch.

This fixes the issue by mapping IO and M32 segments based on the
resources of the PCI devices included in the PE, instead of the
windows of the parent bridge of the PE's primary bus.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 16 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index b954fbcfe14d..904790bf9566 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2993,7 +2993,7 @@ static void pnv_ioda_setup_pe_res(struct pnv_ioda_pe *pe,
  */
 static void pnv_ioda_setup_pe_seg(struct pnv_ioda_pe *pe)
 {
-        struct resource *res;
+        struct pci_dev *pdev;
         int i;
 
         /*
@@ -3003,8 +3003,21 @@ static void pnv_ioda_setup_pe_seg(struct pnv_ioda_pe *pe)
          */
         BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));
 
-        pci_bus_for_each_resource(pe->pbus, res, i)
-                pnv_ioda_setup_pe_res(pe, res);
+        list_for_each_entry(pdev, &pe->pbus->devices, bus_list) {
+                for (i = 0; i <= PCI_ROM_RESOURCE; i++)
+                        pnv_ioda_setup_pe_res(pe, &pdev->resource[i]);
+
+                /*
+                 * If the PE contains all subordinate PCI buses, the
+                 * windows of the child bridges should be mapped to
+                 * the PE as well.
+                 */
+                if (!(pe->flags & PNV_IODA_PE_BUS_ALL) || !pci_is_bridge(pdev))
+                        continue;
+                for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
+                        pnv_ioda_setup_pe_res(pe,
+                                &pdev->resource[PCI_BRIDGE_RESOURCES + i]);
+        }
 }
 
 static void pnv_pci_ioda_setup_seg(void)