On Mon, 7 Mar 2016 15:48:38 +0800
Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx> wrote:
> This patch adds IOMMU_CAP_INTR_REMAP for IODA host bridge so that
> we can mmap MSI-X table in vfio driver.
>
> Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx>
> ---
> arch/powerpc/platforms/powernv/pci-ioda.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index f90dc04..f01b9ab 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -1955,6 +1955,20 @@ static struct iommu_table_ops pnv_ioda2_iommu_ops = {
> .free = pnv_ioda2_table_free,
> };
>
> +static bool pnv_ioda_iommu_capable(enum iommu_cap cap)
> +{
> + switch (cap) {
> + case IOMMU_CAP_INTR_REMAP:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static struct iommu_ops pnv_ioda_iommu_ops = {
> + .capable = pnv_ioda_iommu_capable,
> +};
> +
> static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> struct pnv_ioda_pe *pe, unsigned int base,
> unsigned int segs)
> @@ -3078,6 +3092,9 @@ static void pnv_pci_ioda_fixup(void)
>
> /* Link NPU IODA tables to their PCI devices. */
> pnv_npu_ioda_fixup();
> +
> + /* Add IOMMU_CAP_INTR_REMAP */
> + bus_set_iommu(&pci_bus_type, &pnv_ioda_iommu_ops);
> }
>
> /*
Doesn't this set you up for a world of hurt? bus_set_iommu() calls
iommu_bus_init() which sets up notifiers, which maybe you don't care
about, but it also means that iommu_domain_alloc(&pci_bus_type) will
segfault because you're not providing a domain_alloc callback here.
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