On Tue, Jun 27, 2017 at 12:47:56PM -0700, Jacob Pan wrote:
> Add Intel VT-d ops to the generic iommu_bind_pasid_table API
> functions.
>
> The primary use case is for direct assignment of SVM capable
> device. Originated from emulated IOMMU in the guest, the request goes
> through many layers (e.g. VFIO). Upon calling host IOMMU driver, caller
> passes guest PASID table pointer (GPA) and size.
>
> Device context table entry is modified by Intel IOMMU specific
> bind_pasid_table function. This will turn on nesting mode and matching
> translation type.
>
> The unbind operation restores default context mapping.
>
> Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
> Signed-off-by: Liu, Yi L <yi.l....@linux.intel.com>
> Signed-off-by: Ashok Raj <ashok....@intel.com>
> ---
> drivers/iommu/intel-iommu.c | 117
> ++++++++++++++++++++++++++++++++++++++++++
> include/linux/dma_remapping.h | 1 +
> 2 files changed, 118 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 8274ce3..ef05b59 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5430,6 +5430,119 @@ struct intel_iommu *intel_svm_device_to_iommu(struct
> device *dev)
>
> return iommu;
> }
> +
> +static int intel_iommu_bind_pasid_table(struct iommu_domain *domain,
> + struct device *dev, struct pasid_table_info *pasidt_binfo)
> +{
> + struct intel_iommu *iommu;
> + struct context_entry *context;
> + struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> + struct device_domain_info *info;
> + struct pci_dev *pdev;
> + u8 bus, devfn;
> + u16 did, *sid;
> + int ret = 0;
> + unsigned long flags;
> + u64 ctx_lo;
> +
> + if (pasidt_binfo == NULL || pasidt_binfo->model !=
> IOMMU_MODEL_INTEL_VTD) {
> + pr_warn("%s: Invalid bind request!\n", __func__);
> + return -EINVAL;
> + }
> +
> + iommu = device_to_iommu(dev, &bus, &devfn);
> + if (!iommu)
> + return -ENODEV;
> +
> + sid = (u16 *)&pasidt_binfo->opaque;
> + /*
> + * check SID, if it is not correct, return success to allow looping
> + * through all devices within a group
> + */
> + if (PCI_DEVID(bus, devfn) != *sid)
> + return 0;
> +
> + if (!dev || !dev_is_pci(dev))
> + return -ENODEV;
> +
> + pdev = to_pci_dev(dev);
> + if (!pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI))
> + return -EINVAL;
> +
> + info = dev->archdata.iommu;
> + if (!info || !info->pasid_supported ||
> + !pci_enable_pasid(pdev, info->pasid_supported & ~1)) {
> + pr_err("PCI %04x:%02x:%02x.%d: has no PASID support\n",
> + pci_domain_nr(pdev->bus), bus, PCI_SLOT(devfn),
> + PCI_FUNC(devfn));
You can either use dev_name() here to decode the device name, or just
use dev_err() instead.
