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@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Hiroo Matsumoto <matsumoto.hiroo@xxxxxxxxxxxxxx>
---
arch/powerpc/kernel/pci-common.c | 43 +++++++++++++++++++++++---------------
1 file changed, 26 insertions(+), 17 deletions(-)
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index fa12ae4..0324758 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);
}
--
1.7.9.5
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