1 files changed, 168 insertions, 118 deletions

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index f34209b08b4c..eb348c63a8d0 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -25,6 +25,7 @@
 #include <linux/notifier.h>
 #include <linux/export.h>
 #include <linux/irq.h>
+#include <linux/irqchip/irq-msi-lib.h>
 #include <linux/msi.h>
 #include <linux/irqdomain.h>
 #include <linux/percpu.h>
@@ -63,13 +64,6 @@ static const struct iommu_dirty_ops amd_dirty_ops;
 int amd_iommu_max_glx_val = -1;
 
 /*
- * general struct to manage commands send to an IOMMU
- */
-struct iommu_cmd {
-	u32 data[4];
-};
-
-/*
  * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap
  * to know which ones are already in use.
  */
@@ -241,7 +235,9 @@ static inline int get_acpihid_device_id(struct device *dev,
 					struct acpihid_map_entry **entry)
 {
 	struct acpi_device *adev = ACPI_COMPANION(dev);
-	struct acpihid_map_entry *p;
+	struct acpihid_map_entry *p, *p1 = NULL;
+	int hid_count = 0;
+	bool fw_bug;
 
 	if (!adev)
 		return -ENODEV;
@@ -249,12 +245,33 @@ static inline int get_acpihid_device_id(struct device *dev,
 	list_for_each_entry(p, &acpihid_map, list) {
 		if (acpi_dev_hid_uid_match(adev, p->hid,
 					   p->uid[0] ? p->uid : NULL)) {
-			if (entry)
-				*entry = p;
-			return p->devid;
+			p1 = p;
+			fw_bug = false;
+			hid_count = 1;
+			break;
+		}
+
+		/*
+		 * Count HID matches w/o UID, raise FW_BUG but allow exactly one match
+		 */
+		if (acpi_dev_hid_match(adev, p->hid)) {
+			p1 = p;
+			hid_count++;
+			fw_bug = true;
 		}
 	}
-	return -EINVAL;
+
+	if (!p1)
+		return -EINVAL;
+	if (fw_bug)
+		dev_err_once(dev, FW_BUG "No ACPI device matched UID, but %d device%s matched HID.\n",
+			     hid_count, hid_count > 1 ? "s" : "");
+	if (hid_count > 1)
+		return -EINVAL;
+	if (entry)
+		*entry = p1;
+
+	return p1->devid;
 }
 
 static inline int get_device_sbdf_id(struct device *dev)
@@ -611,8 +628,8 @@ static inline void pdev_disable_cap_pasid(struct pci_dev *pdev)
 
 static void pdev_enable_caps(struct pci_dev *pdev)
 {
-	pdev_enable_cap_ats(pdev);
 	pdev_enable_cap_pasid(pdev);
+	pdev_enable_cap_ats(pdev);
 	pdev_enable_cap_pri(pdev);
 }
 
@@ -982,6 +999,14 @@ int amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
 {
 	iommu_ga_log_notifier = notifier;
 
+	/*
+	 * Ensure all in-flight IRQ handlers run to completion before returning
+	 * to the caller, e.g. to ensure module code isn't unloaded while it's
+	 * being executed in the IRQ handler.
+	 */
+	if (!notifier)
+		synchronize_rcu();
+
 	return 0;
 }
 EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier);
@@ -1812,7 +1837,7 @@ static void free_gcr3_tbl_level1(u64 *tbl)
 
 		ptr = iommu_phys_to_virt(tbl[i] & PAGE_MASK);
 
-		iommu_free_page(ptr);
+		iommu_free_pages(ptr);
 	}
 }
 
@@ -1845,7 +1870,7 @@ static void free_gcr3_table(struct gcr3_tbl_info *gcr3_info)
 	/* Free per device domain ID */
 	pdom_id_free(gcr3_info->domid);
 
-	iommu_free_page(gcr3_info->gcr3_tbl);
+	iommu_free_pages(gcr3_info->gcr3_tbl);
 	gcr3_info->gcr3_tbl = NULL;
 }
 
@@ -1884,7 +1909,7 @@ static int setup_gcr3_table(struct gcr3_tbl_info *gcr3_info,
 		return -ENOSPC;
 	gcr3_info->domid = domid;
 
-	gcr3_info->gcr3_tbl = iommu_alloc_page_node(nid, GFP_ATOMIC);
+	gcr3_info->gcr3_tbl = iommu_alloc_pages_node_sz(nid, GFP_ATOMIC, SZ_4K);
 	if (gcr3_info->gcr3_tbl == NULL) {
 		pdom_id_free(domid);
 		return -ENOMEM;
@@ -2393,6 +2418,13 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev)
 					     pci_max_pasids(to_pci_dev(dev)));
 	}
 
+	if (amd_iommu_pgtable == PD_MODE_NONE) {
+		pr_warn_once("%s: DMA translation not supported by iommu.\n",
+			     __func__);
+		iommu_dev = ERR_PTR(-ENODEV);
+		goto out_err;
+	}
+
 out_err:
 
 	iommu_completion_wait(iommu);
@@ -2480,6 +2512,9 @@ static int pdom_setup_pgtable(struct protection_domain *domain,
 	case PD_MODE_V2:
 		fmt = AMD_IOMMU_V2;
 		break;
+	case PD_MODE_NONE:
+		WARN_ON_ONCE(1);
+		return -EPERM;
 	}
 
 	domain->iop.pgtbl.cfg.amd.nid = dev_to_node(dev);
@@ -2493,14 +2528,30 @@ static int pdom_setup_pgtable(struct protection_domain *domain,
 static inline u64 dma_max_address(enum protection_domain_mode pgtable)
 {
 	if (pgtable == PD_MODE_V1)
-		return ~0ULL;
+		return PM_LEVEL_SIZE(amd_iommu_hpt_level);
 
-	/* V2 with 4/5 level page table */
-	return ((1ULL << PM_LEVEL_SHIFT(amd_iommu_gpt_level)) - 1);
+	/*
+	 * V2 with 4/5 level page table. Note that "2.2.6.5 AMD64 4-Kbyte Page
+	 * Translation" shows that the V2 table sign extends the top of the
+	 * address space creating a reserved region in the middle of the
+	 * translation, just like the CPU does. Further Vasant says the docs are
+	 * incomplete and this only applies to non-zero PASIDs. If the AMDv2
+	 * page table is assigned to the 0 PASID then there is no sign extension
+	 * check.
+	 *
+	 * Since the IOMMU must have a fixed geometry, and the core code does
+	 * not understand sign extended addressing, we have to chop off the high
+	 * bit to get consistent behavior with attachments of the domain to any
+	 * PASID.
+	 */
+	return ((1ULL << (PM_LEVEL_SHIFT(amd_iommu_gpt_level) - 1)) - 1);
 }
 
 static bool amd_iommu_hd_support(struct amd_iommu *iommu)
 {
+	if (amd_iommu_hatdis)
+		return false;
+
 	return iommu && (iommu->features & FEATURE_HDSUP);
 }
 
@@ -2908,6 +2959,9 @@ static void amd_iommu_get_resv_regions(struct device *dev,
 		return;
 	list_add_tail(&region->list, head);
 
+	if (amd_iommu_ht_range_ignore())
+		return;
+
 	region = iommu_alloc_resv_region(HT_RANGE_START,
 					 HT_RANGE_END - HT_RANGE_START + 1,
 					 0, IOMMU_RESV_RESERVED, GFP_KERNEL);
@@ -2984,38 +3038,6 @@ static const struct iommu_dirty_ops amd_dirty_ops = {
 	.read_and_clear_dirty = amd_iommu_read_and_clear_dirty,
 };
 
-static int amd_iommu_dev_enable_feature(struct device *dev,
-					enum iommu_dev_features feat)
-{
-	int ret = 0;
-
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-	return ret;
-}
-
-static int amd_iommu_dev_disable_feature(struct device *dev,
-					 enum iommu_dev_features feat)
-{
-	int ret = 0;
-
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-	return ret;
-}
-
 const struct iommu_ops amd_iommu_ops = {
 	.capable = amd_iommu_capable,
 	.blocked_domain = &blocked_domain,
@@ -3029,8 +3051,6 @@ const struct iommu_ops amd_iommu_ops = {
 	.get_resv_regions = amd_iommu_get_resv_regions,
 	.is_attach_deferred = amd_iommu_is_attach_deferred,
 	.def_domain_type = amd_iommu_def_domain_type,
-	.dev_enable_feat = amd_iommu_dev_enable_feature,
-	.dev_disable_feat = amd_iommu_dev_disable_feature,
 	.page_response = amd_iommu_page_response,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= amd_iommu_attach_device,
@@ -3129,7 +3149,7 @@ static struct irq_remap_table *get_irq_table(struct amd_iommu *iommu, u16 devid)
 	return table;
 }
 
-static struct irq_remap_table *__alloc_irq_table(int nid, int order)
+static struct irq_remap_table *__alloc_irq_table(int nid, size_t size)
 {
 	struct irq_remap_table *table;
 
@@ -3137,7 +3157,8 @@ static struct irq_remap_table *__alloc_irq_table(int nid, int order)
 	if (!table)
 		return NULL;
 
-	table->table = iommu_alloc_pages_node(nid, GFP_KERNEL, order);
+	table->table = iommu_alloc_pages_node_sz(
+		nid, GFP_KERNEL, max(DTE_INTTAB_ALIGNMENT, size));
 	if (!table->table) {
 		kfree(table);
 		return NULL;
@@ -3191,7 +3212,6 @@ static struct irq_remap_table *alloc_irq_table(struct amd_iommu *iommu,
 	struct irq_remap_table *new_table = NULL;
 	struct amd_iommu_pci_seg *pci_seg;
 	unsigned long flags;
-	int order = get_order(get_irq_table_size(max_irqs));
 	int nid = iommu && iommu->dev ? dev_to_node(&iommu->dev->dev) : NUMA_NO_NODE;
 	u16 alias;
 
@@ -3211,7 +3231,7 @@ static struct irq_remap_table *alloc_irq_table(struct amd_iommu *iommu,
 	spin_unlock_irqrestore(&iommu_table_lock, flags);
 
 	/* Nothing there yet, allocate new irq remapping table */
-	new_table = __alloc_irq_table(nid, order);
+	new_table = __alloc_irq_table(nid, get_irq_table_size(max_irqs));
 	if (!new_table)
 		return NULL;
 
@@ -3246,7 +3266,7 @@ out_unlock:
 	spin_unlock_irqrestore(&iommu_table_lock, flags);
 
 	if (new_table) {
-		iommu_free_pages(new_table->table, order);
+		iommu_free_pages(new_table->table);
 		kfree(new_table);
 	}
 	return table;
@@ -3804,13 +3824,70 @@ static const struct irq_domain_ops amd_ir_domain_ops = {
 	.deactivate = irq_remapping_deactivate,
 };
 
-int amd_iommu_activate_guest_mode(void *data)
+static void __amd_iommu_update_ga(struct irte_ga *entry, int cpu,
+				  bool ga_log_intr)
+{
+	if (cpu >= 0) {
+		entry->lo.fields_vapic.destination =
+					APICID_TO_IRTE_DEST_LO(cpu);
+		entry->hi.fields.destination =
+					APICID_TO_IRTE_DEST_HI(cpu);
+		entry->lo.fields_vapic.is_run = true;
+		entry->lo.fields_vapic.ga_log_intr = false;
+	} else {
+		entry->lo.fields_vapic.is_run = false;
+		entry->lo.fields_vapic.ga_log_intr = ga_log_intr;
+	}
+}
+
+/*
+ * Update the pCPU information for an IRTE that is configured to post IRQs to
+ * a vCPU, without issuing an IOMMU invalidation for the IRTE.
+ *
+ * If the vCPU is associated with a pCPU (@cpu >= 0), configure the Destination
+ * with the pCPU's APIC ID, set IsRun, and clear GALogIntr.  If the vCPU isn't
+ * associated with a pCPU (@cpu < 0), clear IsRun and set/clear GALogIntr based
+ * on input from the caller (e.g. KVM only requests GALogIntr when the vCPU is
+ * blocking and requires a notification wake event).  I.e. treat vCPUs that are
+ * associated with a pCPU as running.  This API is intended to be used when a
+ * vCPU is scheduled in/out (or stops running for any reason), to do a fast
+ * update of IsRun, GALogIntr, and (conditionally) Destination.
+ *
+ * Per the IOMMU spec, the Destination, IsRun, and GATag fields are not cached
+ * and thus don't require an invalidation to ensure the IOMMU consumes fresh
+ * information.
+ */
+int amd_iommu_update_ga(void *data, int cpu, bool ga_log_intr)
+{
+	struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
+	struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
+
+	if (WARN_ON_ONCE(!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)))
+		return -EINVAL;
+
+	if (!entry || !entry->lo.fields_vapic.guest_mode)
+		return 0;
+
+	if (!ir_data->iommu)
+		return -ENODEV;
+
+	__amd_iommu_update_ga(entry, cpu, ga_log_intr);
+
+	return __modify_irte_ga(ir_data->iommu, ir_data->irq_2_irte.devid,
+				ir_data->irq_2_irte.index, entry);
+}
+EXPORT_SYMBOL(amd_iommu_update_ga);
+
+int amd_iommu_activate_guest_mode(void *data, int cpu, bool ga_log_intr)
 {
 	struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
 	struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
 	u64 valid;
 
-	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) || !entry)
+	if (WARN_ON_ONCE(!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)))
+		return -EINVAL;
+
+	if (!entry)
 		return 0;
 
 	valid = entry->lo.fields_vapic.valid;
@@ -3820,11 +3897,12 @@ int amd_iommu_activate_guest_mode(void *data)
 
 	entry->lo.fields_vapic.valid       = valid;
 	entry->lo.fields_vapic.guest_mode  = 1;
-	entry->lo.fields_vapic.ga_log_intr = 1;
 	entry->hi.fields.ga_root_ptr       = ir_data->ga_root_ptr;
 	entry->hi.fields.vector            = ir_data->ga_vector;
 	entry->lo.fields_vapic.ga_tag      = ir_data->ga_tag;
 
+	__amd_iommu_update_ga(entry, cpu, ga_log_intr);
+
 	return modify_irte_ga(ir_data->iommu, ir_data->irq_2_irte.devid,
 			      ir_data->irq_2_irte.index, entry);
 }
@@ -3837,8 +3915,10 @@ int amd_iommu_deactivate_guest_mode(void *data)
 	struct irq_cfg *cfg = ir_data->cfg;
 	u64 valid;
 
-	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
-	    !entry || !entry->lo.fields_vapic.guest_mode)
+	if (WARN_ON_ONCE(!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)))
+		return -EINVAL;
+
+	if (!entry || !entry->lo.fields_vapic.guest_mode)
 		return 0;
 
 	valid = entry->lo.fields_remap.valid;
@@ -3860,11 +3940,10 @@ int amd_iommu_deactivate_guest_mode(void *data)
 }
 EXPORT_SYMBOL(amd_iommu_deactivate_guest_mode);
 
-static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
+static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *info)
 {
 	int ret;
-	struct amd_iommu_pi_data *pi_data = vcpu_info;
-	struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
+	struct amd_iommu_pi_data *pi_data = info;
 	struct amd_ir_data *ir_data = data->chip_data;
 	struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
 	struct iommu_dev_data *dev_data;
@@ -3885,25 +3964,20 @@ static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
 		return -EINVAL;
 
 	ir_data->cfg = irqd_cfg(data);
-	pi_data->ir_data = ir_data;
 
-	pi_data->prev_ga_tag = ir_data->cached_ga_tag;
-	if (pi_data->is_guest_mode) {
-		ir_data->ga_root_ptr = (pi_data->base >> 12);
-		ir_data->ga_vector = vcpu_pi_info->vector;
+	if (pi_data) {
+		pi_data->ir_data = ir_data;
+
+		ir_data->ga_root_ptr = (pi_data->vapic_addr >> 12);
+		ir_data->ga_vector = pi_data->vector;
 		ir_data->ga_tag = pi_data->ga_tag;
-		ret = amd_iommu_activate_guest_mode(ir_data);
-		if (!ret)
-			ir_data->cached_ga_tag = pi_data->ga_tag;
+		if (pi_data->is_guest_mode)
+			ret = amd_iommu_activate_guest_mode(ir_data, pi_data->cpu,
+							    pi_data->ga_log_intr);
+		else
+			ret = amd_iommu_deactivate_guest_mode(ir_data);
 	} else {
 		ret = amd_iommu_deactivate_guest_mode(ir_data);
-
-		/*
-		 * This communicates the ga_tag back to the caller
-		 * so that it can do all the necessary clean up.
-		 */
-		if (!ret)
-			ir_data->cached_ga_tag = 0;
 	}
 
 	return ret;
@@ -3970,54 +4044,30 @@ static struct irq_chip amd_ir_chip = {
 
 static const struct msi_parent_ops amdvi_msi_parent_ops = {
 	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED | MSI_FLAG_MULTI_PCI_MSI,
+	.bus_select_token	= DOMAIN_BUS_AMDVI,
+	.bus_select_mask	= MATCH_PCI_MSI,
 	.prefix			= "IR-",
 	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
 };
 
 int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
 {
-	struct fwnode_handle *fn;
+	struct irq_domain_info info = {
+		.fwnode		= irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index),
+		.ops		= &amd_ir_domain_ops,
+		.domain_flags	= IRQ_DOMAIN_FLAG_ISOLATED_MSI,
+		.host_data	= iommu,
+		.parent		= arch_get_ir_parent_domain(),
+	};
 
-	fn = irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index);
-	if (!fn)
+	if (!info.fwnode)
 		return -ENOMEM;
-	iommu->ir_domain = irq_domain_create_hierarchy(arch_get_ir_parent_domain(), 0, 0,
-						       fn, &amd_ir_domain_ops, iommu);
+
+	iommu->ir_domain = msi_create_parent_irq_domain(&info, &amdvi_msi_parent_ops);
 	if (!iommu->ir_domain) {
-		irq_domain_free_fwnode(fn);
+		irq_domain_free_fwnode(info.fwnode);
 		return -ENOMEM;
 	}
-
-	irq_domain_update_bus_token(iommu->ir_domain,  DOMAIN_BUS_AMDVI);
-	iommu->ir_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT |
-				   IRQ_DOMAIN_FLAG_ISOLATED_MSI;
-	iommu->ir_domain->msi_parent_ops = &amdvi_msi_parent_ops;
-
 	return 0;
 }
-
-int amd_iommu_update_ga(int cpu, bool is_run, void *data)
-{
-	struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
-	struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
-
-	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
-	    !entry || !entry->lo.fields_vapic.guest_mode)
-		return 0;
-
-	if (!ir_data->iommu)
-		return -ENODEV;
-
-	if (cpu >= 0) {
-		entry->lo.fields_vapic.destination =
-					APICID_TO_IRTE_DEST_LO(cpu);
-		entry->hi.fields.destination =
-					APICID_TO_IRTE_DEST_HI(cpu);
-	}
-	entry->lo.fields_vapic.is_run = is_run;
-
-	return __modify_irte_ga(ir_data->iommu, ir_data->irq_2_irte.devid,
-				ir_data->irq_2_irte.index, entry);
-}
-EXPORT_SYMBOL(amd_iommu_update_ga);
 #endif