diff options
Diffstat (limited to 'drivers/iommu/intel/iommu.c')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 64 |
1 files changed, 12 insertions, 52 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 761feac91767..1db4d8934526 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4347,6 +4347,17 @@ int __init intel_iommu_init(void) down_read(&dmar_global_lock); for_each_active_iommu(iommu, drhd) { + /* + * The flush queue implementation does not perform + * page-selective invalidations that are required for efficient + * TLB flushes in virtual environments. The benefit of batching + * is likely to be much lower than the overhead of synchronizing + * the virtual and physical IOMMU page-tables. + */ + if (!intel_iommu_strict && cap_caching_mode(iommu->cap)) { + pr_warn("IOMMU batching is disabled due to virtualization"); + intel_iommu_strict = 1; + } iommu_device_sysfs_add(&iommu->iommu, NULL, intel_iommu_groups, "%s", iommu->name); @@ -4355,6 +4366,7 @@ int __init intel_iommu_init(void) } up_read(&dmar_global_lock); + iommu_set_dma_strict(intel_iommu_strict); bus_set_iommu(&pci_bus_type, &intel_iommu_ops); if (si_domain && !hw_pass_through) register_memory_notifier(&intel_iommu_memory_nb); @@ -5413,57 +5425,6 @@ intel_iommu_enable_nesting(struct iommu_domain *domain) return ret; } -static bool domain_use_flush_queue(void) -{ - struct dmar_drhd_unit *drhd; - struct intel_iommu *iommu; - bool r = true; - - if (intel_iommu_strict) - return false; - - /* - * The flush queue implementation does not perform page-selective - * invalidations that are required for efficient TLB flushes in virtual - * environments. The benefit of batching is likely to be much lower than - * the overhead of synchronizing the virtual and physical IOMMU - * page-tables. - */ - rcu_read_lock(); - for_each_active_iommu(iommu, drhd) { - if (!cap_caching_mode(iommu->cap)) - continue; - - pr_warn_once("IOMMU batching is disabled due to virtualization"); - r = false; - break; - } - rcu_read_unlock(); - - return r; -} - -static int -intel_iommu_domain_get_attr(struct iommu_domain *domain, - enum iommu_attr attr, void *data) -{ - switch (domain->type) { - case IOMMU_DOMAIN_UNMANAGED: - return -ENODEV; - case IOMMU_DOMAIN_DMA: - switch (attr) { - case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE: - *(int *)data = domain_use_flush_queue(); - return 0; - default: - return -ENODEV; - } - break; - default: - return -EINVAL; - } -} - /* * Check that the device does not live on an external facing PCI port that is * marked as untrusted. Such devices should not be able to apply quirks and @@ -5536,7 +5497,6 @@ const struct iommu_ops intel_iommu_ops = { .capable = intel_iommu_capable, .domain_alloc = intel_iommu_domain_alloc, .domain_free = intel_iommu_domain_free, - .domain_get_attr = intel_iommu_domain_get_attr, .enable_nesting = intel_iommu_enable_nesting, .attach_dev = intel_iommu_attach_device, .detach_dev = intel_iommu_detach_device, |