diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 90ad794a1be73..723ea9f3f501a 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -167,14 +167,7 @@ static void device_rbtree_remove(struct device_domain_info *info)
spin_unlock_irqrestore(&iommu->device_rbtree_lock, flags);
}
-/*
- * This domain is a statically identity mapping domain.
- * 1. This domain creats a static 1:1 mapping to all usable memory.
- * 2. It maps to each iommu if successful.
- * 3. Each iommu mapps to this domain if successful.
- */
static struct dmar_domain *si_domain;
-static int hw_pass_through = 1;
struct dmar_rmrr_unit {
struct list_head list; /* list of rmrr units */
@@ -1647,7 +1640,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct context_entry *context;
int agaw, ret;
- if (hw_pass_through && domain_type_is_si(domain))
+ if (domain_type_is_si(domain))
translation = CONTEXT_TT_PASS_THROUGH;
pr_debug("Set context mapping for %02x:%02x.%d\n",
@@ -1998,29 +1991,10 @@ static bool dev_is_real_dma_subdevice(struct device *dev)
pci_real_dma_dev(to_pci_dev(dev)) != to_pci_dev(dev);
}
-static int iommu_domain_identity_map(struct dmar_domain *domain,
- unsigned long first_vpfn,
- unsigned long last_vpfn)
-{
- /*
- * RMRR range might have overlap with physical memory range,
- * clear it first
- */
- dma_pte_clear_range(domain, first_vpfn, last_vpfn);
-
- return __domain_mapping(domain, first_vpfn,
- first_vpfn, last_vpfn - first_vpfn + 1,
- DMA_PTE_READ|DMA_PTE_WRITE, GFP_KERNEL);
-}
-
static int md_domain_init(struct dmar_domain *domain, int guest_width);
-static int __init si_domain_init(int hw)
+static int __init si_domain_init(void)
{
- struct dmar_rmrr_unit *rmrr;
- struct device *dev;
- int i, nid, ret;
-
si_domain = alloc_domain(IOMMU_DOMAIN_IDENTITY);
if (!si_domain)
return -EFAULT;
@@ -2031,44 +2005,6 @@ static int __init si_domain_init(int hw)
return -EFAULT;
}
- if (hw)
- return 0;
-
- for_each_online_node(nid) {
- unsigned long start_pfn, end_pfn;
- int i;
-
- for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
- ret = iommu_domain_identity_map(si_domain,
- mm_to_dma_pfn_start(start_pfn),
- mm_to_dma_pfn_end(end_pfn-1));
- if (ret)
- return ret;
- }
- }
-
- /*
- * Identity map the RMRRs so that devices with RMRRs could also use
- * the si_domain.
- */
- for_each_rmrr_units(rmrr) {
- for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
- i, dev) {
- unsigned long long start = rmrr->base_address;
- unsigned long long end = rmrr->end_address;
-
- if (WARN_ON(end < start ||
- end >> agaw_to_width(si_domain->agaw)))
- continue;
-
- ret = iommu_domain_identity_map(si_domain,
- mm_to_dma_pfn_start(start >> PAGE_SHIFT),
- mm_to_dma_pfn_end(end >> PAGE_SHIFT));
- if (ret)
- return ret;
- }
- }
-
return 0;
}
@@ -2094,7 +2030,7 @@ static int dmar_domain_attach_device(struct dmar_domain *domain,
if (!sm_supported(iommu))
ret = domain_context_mapping(domain, dev);
- else if (hw_pass_through && domain_type_is_si(domain))
+ else if (domain_type_is_si(domain))
ret = intel_pasid_setup_pass_through(iommu, dev, IOMMU_NO_PASID);
else if (domain->use_first_level)
ret = domain_setup_first_level(iommu, domain, dev, IOMMU_NO_PASID);
@@ -2449,8 +2385,6 @@ static int __init init_dmars(void)
}
}
- if (!ecap_pass_through(iommu->ecap))
- hw_pass_through = 0;
intel_svm_check(iommu);
}
@@ -2466,7 +2400,7 @@ static int __init init_dmars(void)
check_tylersburg_isoch();
- ret = si_domain_init(hw_pass_through);
+ ret = si_domain_init();
if (ret)
goto free_iommu;
@@ -2893,12 +2827,6 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
if (ret)
goto out;
- if (hw_pass_through && !ecap_pass_through(iommu->ecap)) {
- pr_warn("%s: Doesn't support hardware pass through.\n",
- iommu->name);
- return -ENXIO;
- }
-
sp = domain_update_iommu_superpage(NULL, iommu) - 1;
if (sp >= 0 && !(cap_super_page_val(iommu->cap) & (1 << sp))) {
pr_warn("%s: Doesn't support large page.\n",
@@ -3149,43 +3077,6 @@ int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
return 0;
}
-static int intel_iommu_memory_notifier(struct notifier_block *nb,
- unsigned long val, void *v)
-{
- struct memory_notify *mhp = v;
- unsigned long start_vpfn = mm_to_dma_pfn_start(mhp->start_pfn);
- unsigned long last_vpfn = mm_to_dma_pfn_end(mhp->start_pfn +
- mhp->nr_pages - 1);
-
- switch (val) {
- case MEM_GOING_ONLINE:
- if (iommu_domain_identity_map(si_domain,
- start_vpfn, last_vpfn)) {
- pr_warn("Failed to build identity map for [%lx-%lx]\n",
- start_vpfn, last_vpfn);
- return NOTIFY_BAD;
- }
- break;
-
- case MEM_OFFLINE:
- case MEM_CANCEL_ONLINE:
- {
- LIST_HEAD(freelist);
-
- domain_unmap(si_domain, start_vpfn, last_vpfn, &freelist);
- iommu_put_pages_list(&freelist);
- }
- break;
- }
-
- return NOTIFY_OK;
-}
-
-static struct notifier_block intel_iommu_memory_nb = {
- .notifier_call = intel_iommu_memory_notifier,
- .priority = 0
-};
-
static void intel_disable_iommus(void)
{
struct intel_iommu *iommu = NULL;
@@ -3482,12 +3373,7 @@ int __init intel_iommu_init(void)
iommu_pmu_register(iommu);
}
- up_read(&dmar_global_lock);
-
- if (si_domain && !hw_pass_through)
- register_memory_notifier(&intel_iommu_memory_nb);
- down_read(&dmar_global_lock);
if (probe_acpi_namespace_devices())
pr_warn("ACPI name space devices didn't probe correctly\n");