On 2016/3/17 0:32, Alex Williamson wrote:
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.
It seems to be hard to add IOMMU_CAP_INTR_REMAP on
PPC64 platform.
And can we add a new ioctl in vfio_iommu_driver to check
if interrupt remapping is supported so that we can use our
own way to determine that on PPC64 platform?
Thanks,
Yongji Xie
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