Messages in this thread Patch in this message | | | From | Lu Baolu <> | Subject | [RFC PATCH v2 02/10] iommu/vt-d: Add multiple domains per device query | Date | Thu, 30 Aug 2018 12:09:14 +0800 |
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Add the response to IOMMU_CAP_AUX_DOMAIN capability query through iommu_capable(). Return true if IOMMUs support the scalable mode, return false otherwise.
Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: Kevin Tian <kevin.tian@intel.com> Cc: Liu Yi L <yi.l.liu@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- drivers/iommu/intel-iommu.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 3e49d4029058..891ae70e7bf2 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5193,12 +5193,39 @@ 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) + switch (cap) { + case IOMMU_CAP_CACHE_COHERENCY: return domain_update_iommu_snooping(NULL) == 1; - if (cap == IOMMU_CAP_INTR_REMAP) + case IOMMU_CAP_INTR_REMAP: return irq_remapping_enabled == 1; + case IOMMU_CAP_AUX_DOMAIN: + return scalable_mode_support(); + case IOMMU_CAP_NOEXEC: + /* PASSTHROUGH */ + default: + pr_info("Unsupported capability query %d\n", cap); + break; + } return false; } -- 2.17.1
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