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SubjectRe: [PATCH v4 2/8] iommu/vt-d: Add multiple domains per device query
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Hi,

On 11/5/18 8:34 AM, Lu Baolu wrote:
> Add the response to IOMMU_DEV_ATTR_AUXD_CAPABILITY capability query
> through iommu_get_dev_attr().

commit title: Advertise auxiliary domain capability?
>
> Cc: Ashok Raj <ashok.raj@intel.com>
> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Cc: Kevin Tian <kevin.tian@intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> ---
> drivers/iommu/intel-iommu.c | 38 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 38 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 5e149d26ea9b..298f7a3fafe8 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5167,6 +5167,24 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
> return phys;
> }
>
> +static inline bool scalable_mode_support(void)
> +{
> + struct dmar_drhd_unit *drhd;
> + struct intel_iommu *iommu;
> + bool ret = true;
> +
> + rcu_read_lock();
> + for_each_active_iommu(iommu, drhd) {
> + if (!sm_supported(iommu)) {
> + ret = false;
> + break;
> + }
> + }
> + rcu_read_unlock();
> +
> + return ret;
> +}
> +
> static bool intel_iommu_capable(enum iommu_cap cap)
> {
> if (cap == IOMMU_CAP_CACHE_COHERENCY)
> @@ -5331,6 +5349,25 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
> }
> #endif /* CONFIG_INTEL_IOMMU_SVM */
>
> +static int intel_iommu_get_dev_attr(struct device *dev,
> + enum iommu_dev_attr attr, void *data)
> +{
> + int ret = 0;
> + bool *auxd_capable;
nit: could be local to the case as other cases may use other datatypes.
> +
> + switch (attr) {
> + case IOMMU_DEV_ATTR_AUXD_CAPABILITY:
> + auxd_capable = data;
> + *auxd_capable = scalable_mode_support();
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + return ret;
> +}
> +
> const struct iommu_ops intel_iommu_ops = {
> .capable = intel_iommu_capable,
> .domain_alloc = intel_iommu_domain_alloc,
> @@ -5345,6 +5382,7 @@ const struct iommu_ops intel_iommu_ops = {
> .get_resv_regions = intel_iommu_get_resv_regions,
> .put_resv_regions = intel_iommu_put_resv_regions,
> .device_group = pci_device_group,
> + .get_dev_attr = intel_iommu_get_dev_attr,
> .pgsize_bitmap = INTEL_IOMMU_PGSIZES,
> };
>
>
Thanks

Eric

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