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Code Issues Releases Wiki Activity

powerpc/pci: Fix pcibios_setup_device() ordering 

Move PCI device setup from pcibios_add_device() and pcibios_fixup_bus() to
pcibios_bus_add_device(). This ensures that platform-specific DMA and IOMMU
setup occurs after the device has been registered in sysfs, which is a
requirement for IOMMU group assignment to work

This fixes IOMMU group assignment for hotplugged devices on pseries, where
the existing behavior results in IOMMU assignment before registration.

Thanks to Lukas Wunner <lukas@wunner.de> for the suggestion.

Signed-off-by: Shawn Anastasio <shawn@anastas.io>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191028085424.12006-2-oohall@gmail.com
This commit is contained in:
Shawn Anastasio 2019-10-28 19:54:23 +11:00 committed by Michael Ellerman
parent 3b5b9997b3
commit 30d87ef8b3
1 changed files with 9 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
arch/powerpc/kernel/pci-common.c
View File

@ -261,12 +261,6 @@ int pcibios_sriov_disable(struct pci_dev *pdev)
#endif /* CONFIG_PCI_IOV */
void pcibios_bus_add_device(struct pci_dev *pdev)
{
if (ppc_md.pcibios_bus_add_device)
ppc_md.pcibios_bus_add_device(pdev);
}
static resource_size_t pcibios_io_size(const struct pci_controller *hose)
{
#ifdef CONFIG_PPC64
@ -987,15 +981,17 @@ static void pcibios_setup_device(struct pci_dev *dev)
ppc_md.pci_irq_fixup(dev);
}
void pcibios_bus_add_device(struct pci_dev *pdev)
{
/* Perform platform-specific device setup */
pcibios_setup_device(pdev);
if (ppc_md.pcibios_bus_add_device)
ppc_md.pcibios_bus_add_device(pdev);
}
int pcibios_add_device(struct pci_dev *dev)
{
/*
* We can only call pcibios_setup_device() after bus setup is complete,
* since some of the platform specific DMA setup code depends on it.
*/
if (dev->bus->is_added)
pcibios_setup_device(dev);
#ifdef CONFIG_PCI_IOV
if (ppc_md.pcibios_fixup_sriov)
ppc_md.pcibios_fixup_sriov(dev);
@ -1037,9 +1033,6 @@ void pcibios_fixup_bus(struct pci_bus *bus)
/* Now fixup the bus bus */
pcibios_setup_bus_self(bus);
/* Now fixup devices on that bus */
pcibios_setup_bus_devices(bus);
}
EXPORT_SYMBOL(pcibios_fixup_bus);