On 06/30/2017 01:24 PM, Alexey Kardashevskiy wrote: > From: Yongji Xie <elohimes@xxxxxxxxx> > > Some iommu drivers would be initialized after PCI device > enumeration. So PCI_BUS_FLAGS_MSI_REMAP would not be set > when probing PCI devices although IOMMU enables capability > of IRQ remapping. This patch tests this capability and > set the flag when iommu driver is initialized. > > Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx> > --- > drivers/iommu/iommu.c | 8 ++++++++ > drivers/pci/probe.c | 1 + > 2 files changed, 9 insertions(+) > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index cf7ca7e70777..0b5881ddca09 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -1063,6 +1063,14 @@ static int add_iommu_group(struct device *dev, void *data) > const struct iommu_ops *ops = cb->ops; > int ret; > > + /* > + * Set PCI_BUS_FLAGS_MSI_REMAP for all PCI buses when IOMMU > + * have capability of IRQ remapping. > + */ > + if (dev_is_pci(dev) && ops->capable && > + ops->capable(IOMMU_CAP_INTR_REMAP)) > + to_pci_dev(dev)->bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; [+Kevin] Hi Alexey, Just a reminder, you might want to check the proposed patch to intel-iommu by Alex, at: https://patchwork.kernel.org/patch/9092511/ Without that being the prerequisite, this patch will probably introduce security issues on x86. -- Thanks, Jike > + > if (!ops->add_device) > return 0; > > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index f2393b7d7ebf..14aac9df3d17 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -17,6 +17,7 @@ > #include <linux/acpi.h> > #include <linux/irqdomain.h> > #include <linux/pm_runtime.h> > +#include <linux/iommu.h> > #include "pci.h" > > #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ >
