On Wed, 26 Apr 2017 18:12:01 +0800
"Liu, Yi L" <yi.l.liu@xxxxxxxxx> wrote:
> From: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
>
> This patch adds Intel VT-d specific function to implement
> iommu_do_invalidate API.
>
> The use case is for supporting caching structure invalidation
> of assigned SVM capable devices. Emulated IOMMU exposes queue
> invalidation capability and passes down all descriptors from the guest
> to the physical IOMMU.
>
> The assumption is that guest to host device ID mapping should be
> resolved prior to calling IOMMU driver. Based on the device handle,
> host IOMMU driver can replace certain fields before submit to the
> invalidation queue.
>
> Signed-off-by: Liu, Yi L <yi.l.liu@xxxxxxxxxxxxxxx>
> Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> ---
> drivers/iommu/intel-iommu.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/intel-iommu.h | 11 +++++++++++
> 2 files changed, 54 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 6d5b939..0b098ad 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5042,6 +5042,48 @@ static void intel_iommu_detach_device(struct iommu_domain *domain,
> dmar_remove_one_dev_info(to_dmar_domain(domain), dev);
> }
>
> +static int intel_iommu_do_invalidate(struct iommu_domain *domain,
> + struct device *dev, struct tlb_invalidate_info *inv_info)
> +{
> + int ret = 0;
> + struct intel_iommu *iommu;
> + struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> + struct intel_invalidate_data *inv_data;
> + struct qi_desc *qi;
> + u16 did;
> + u8 bus, devfn;
> +
> + if (!inv_info || !dmar_domain || (inv_info->model != INTEL_IOMMU))
> + return -EINVAL;
> +
> + iommu = device_to_iommu(dev, &bus, &devfn);
> + if (!iommu)
> + return -ENODEV;
> +
> + inv_data = (struct intel_invalidate_data *)&inv_info->opaque;
> +
> + /* check SID */
> + if (PCI_DEVID(bus, devfn) != inv_data->sid)
> + return 0;
> +
> + qi = &inv_data->inv_desc;
> +
> + switch (qi->low & QI_TYPE_MASK) {
> + case QI_DIOTLB_TYPE:
> + case QI_DEIOTLB_TYPE:
> + /* for device IOTLB, we just let it pass through */
> + break;
> + default:
> + did = dmar_domain->iommu_did[iommu->seq_id];
> + set_mask_bits(&qi->low, QI_DID_MASK, QI_DID(did));
> + break;
> + }
> +
> + ret = qi_submit_sync(qi, iommu);
> +
> + return ret;
nit, ret variable is unnecessary.
> +}
> +
> static int intel_iommu_map(struct iommu_domain *domain,
> unsigned long iova, phys_addr_t hpa,
> size_t size, int iommu_prot)
> @@ -5416,6 +5458,7 @@ static int intel_iommu_unbind_pasid_table(struct iommu_domain *domain,
> #ifdef CONFIG_INTEL_IOMMU_SVM
> .bind_pasid_table = intel_iommu_bind_pasid_table,
> .unbind_pasid_table = intel_iommu_unbind_pasid_table,
> + .do_invalidate = intel_iommu_do_invalidate,
> #endif
> .map = intel_iommu_map,
> .unmap = intel_iommu_unmap,
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index ac04f28..9d6562c 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -29,6 +29,7 @@
> #include <linux/dma_remapping.h>
> #include <linux/mmu_notifier.h>
> #include <linux/list.h>
> +#include <linux/bitops.h>
> #include <asm/cacheflush.h>
> #include <asm/iommu.h>
>
> @@ -271,6 +272,10 @@ enum {
> #define QI_PGRP_RESP_TYPE 0x9
> #define QI_PSTRM_RESP_TYPE 0xa
>
> +#define QI_DID(did) (((u64)did & 0xffff) << 16)
> +#define QI_DID_MASK GENMASK(31, 16)
> +#define QI_TYPE_MASK GENMASK(3, 0)
> +
> #define QI_IEC_SELECTIVE (((u64)1) << 4)
> #define QI_IEC_IIDEX(idx) (((u64)(idx & 0xffff) << 32))
> #define QI_IEC_IM(m) (((u64)(m & 0x1f) << 27))
> @@ -529,6 +534,12 @@ struct intel_svm {
> extern struct intel_iommu *intel_svm_device_to_iommu(struct device *dev);
> #endif
>
> +struct intel_invalidate_data {
> + u16 sid;
> + u32 pasid;
> + struct qi_desc inv_desc;
> +};
This needs to be uapi since the vfio user is expected to create it, so
we need a uapi version of qi_desc too.
> +
> extern const struct attribute_group *intel_iommu_groups[];
> extern void intel_iommu_debugfs_init(void);
> extern struct context_entry *iommu_context_addr(struct intel_iommu *iommu,
