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Subject[RFC PATCH v2 02/10] iommu/vt-d: Add multiple domains per device query
Date
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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