powerpc/pci: fix PCI-e devices rescan issue on powerpc platform

Powerpc initializes the DMA and IRQ information in pci_scan_child_bus()->
pcibios_fixup_bus()->pcibios_setup_bus_devices(). But for the devices
which are hotpluged, bus->is added has been set for the first scan of the
PCI-e bus, so the initialization code won't be called. Then the hotpluged
devices' driver will fail to load.

For example :
The PCI-e device 0001:03:00.0 is the Intel PCI-e e1000e network card, remove
it from the system:

    # echo 1 > /sys/bus/pci/devices/0001\:03\:00.0/remove
    # e1000e 0001:03:00.0 eth0: removed PHC

Rescan it from it's bus:

    # echo 1 > /sys/bus/pci/devices/0001\:02\:00.0/rescan
    ...
    e1000e 0001:03:00.0: Disabling ASPM L0s L1
    e1000e 0001:03:00.0: No usable DMA configuration, aborting
    e1000e: probe of 0001:03:00.0 failed with error -5

So we move the DMA & IRQ initialization code from pcibios_setup_devices() and
construct a new function pcibios_enable_device. We call this function in
pcibios_enable_device, which will be called by PCI-e rescan code. At the
meanwhile, we avoid the the impact on cardbus. I also validate this patch with
silicon's PCIe-sata which encounters the IRQ issue.

Signed-off-by: Yuanquan Chen <Yuanquan.Chen@freescale.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Hiroo Matsumoto <matsumoto.hiroo@jp.fujitsu.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

1 files changed, 26 insertions, 17 deletions

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index fa12ae42d98c..032475851d6a 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1023,6 +1023,27 @@ void pcibios_setup_bus_self(struct pci_bus *bus)
                 ppc_md.pci_dma_bus_setup(bus);
 }
 
+void pcibios_setup_device(struct pci_dev *dev)
+{
+        /* Fixup NUMA node as it may not be setup yet by the generic
+         * code and is needed by the DMA init
+         */
+        set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
+
+        /* Hook up default DMA ops */
+        set_dma_ops(&dev->dev, pci_dma_ops);
+        set_dma_offset(&dev->dev, PCI_DRAM_OFFSET);
+
+        /* Additional platform DMA/iommu setup */
+        if (ppc_md.pci_dma_dev_setup)
+                ppc_md.pci_dma_dev_setup(dev);
+
+        /* Read default IRQs and fixup if necessary */
+        pci_read_irq_line(dev);
+        if (ppc_md.pci_irq_fixup)
+                ppc_md.pci_irq_fixup(dev);
+}
+
 void pcibios_setup_bus_devices(struct pci_bus *bus)
 {
         struct pci_dev *dev;
@@ -1037,23 +1058,7 @@ void pcibios_setup_bus_devices(struct pci_bus *bus)
                 if (dev->is_added)
                         continue;
 
-                /* Fixup NUMA node as it may not be setup yet by the generic
-                 * code and is needed by the DMA init
-                 */
-                set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
-
-                /* Hook up default DMA ops */
-                set_dma_ops(&dev->dev, pci_dma_ops);
-                set_dma_offset(&dev->dev, PCI_DRAM_OFFSET);
-
-                /* Additional platform DMA/iommu setup */
-                if (ppc_md.pci_dma_dev_setup)
-                        ppc_md.pci_dma_dev_setup(dev);
-
-                /* Read default IRQs and fixup if necessary */
-                pci_read_irq_line(dev);
-                if (ppc_md.pci_irq_fixup)
-                        ppc_md.pci_irq_fixup(dev);
+                pcibios_setup_device(dev);
         }
 }
 
@@ -1494,6 +1499,10 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
                 if (ppc_md.pcibios_enable_device_hook(dev))
                         return -EINVAL;
 
+        /* avoid pcie irq fix up impact on cardbus */
+        if (dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
+                pcibios_setup_device(dev);
+
         return pci_enable_resources(dev, mask);
 }