7 files changed, 710 insertions, 173 deletions

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index f2f8f05662de..ca2aed86b540 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -788,6 +788,294 @@ void acpi_configure_pmsi_domain(struct device *dev)
 }
 
 #ifdef CONFIG_IOMMU_API
+static void iort_rmr_free(struct device *dev,
+			  struct iommu_resv_region *region)
+{
+	struct iommu_iort_rmr_data *rmr_data;
+
+	rmr_data = container_of(region, struct iommu_iort_rmr_data, rr);
+	kfree(rmr_data->sids);
+	kfree(rmr_data);
+}
+
+static struct iommu_iort_rmr_data *iort_rmr_alloc(
+					struct acpi_iort_rmr_desc *rmr_desc,
+					int prot, enum iommu_resv_type type,
+					u32 *sids, u32 num_sids)
+{
+	struct iommu_iort_rmr_data *rmr_data;
+	struct iommu_resv_region *region;
+	u32 *sids_copy;
+	u64 addr = rmr_desc->base_address, size = rmr_desc->length;
+
+	rmr_data = kmalloc(sizeof(*rmr_data), GFP_KERNEL);
+	if (!rmr_data)
+		return NULL;
+
+	/* Create a copy of SIDs array to associate with this rmr_data */
+	sids_copy = kmemdup(sids, num_sids * sizeof(*sids), GFP_KERNEL);
+	if (!sids_copy) {
+		kfree(rmr_data);
+		return NULL;
+	}
+	rmr_data->sids = sids_copy;
+	rmr_data->num_sids = num_sids;
+
+	if (!IS_ALIGNED(addr, SZ_64K) || !IS_ALIGNED(size, SZ_64K)) {
+		/* PAGE align base addr and size */
+		addr &= PAGE_MASK;
+		size = PAGE_ALIGN(size + offset_in_page(rmr_desc->base_address));
+
+		pr_err(FW_BUG "RMR descriptor[0x%llx - 0x%llx] not aligned to 64K, continue with [0x%llx - 0x%llx]\n",
+		       rmr_desc->base_address,
+		       rmr_desc->base_address + rmr_desc->length - 1,
+		       addr, addr + size - 1);
+	}
+
+	region = &rmr_data->rr;
+	INIT_LIST_HEAD(&region->list);
+	region->start = addr;
+	region->length = size;
+	region->prot = prot;
+	region->type = type;
+	region->free = iort_rmr_free;
+
+	return rmr_data;
+}
+
+static void iort_rmr_desc_check_overlap(struct acpi_iort_rmr_desc *desc,
+					u32 count)
+{
+	int i, j;
+
+	for (i = 0; i < count; i++) {
+		u64 end, start = desc[i].base_address, length = desc[i].length;
+
+		if (!length) {
+			pr_err(FW_BUG "RMR descriptor[0x%llx] with zero length, continue anyway\n",
+			       start);
+			continue;
+		}
+
+		end = start + length - 1;
+
+		/* Check for address overlap */
+		for (j = i + 1; j < count; j++) {
+			u64 e_start = desc[j].base_address;
+			u64 e_end = e_start + desc[j].length - 1;
+
+			if (start <= e_end && end >= e_start)
+				pr_err(FW_BUG "RMR descriptor[0x%llx - 0x%llx] overlaps, continue anyway\n",
+				       start, end);
+		}
+	}
+}
+
+/*
+ * Please note, we will keep the already allocated RMR reserve
+ * regions in case of a memory allocation failure.
+ */
+static void iort_get_rmrs(struct acpi_iort_node *node,
+			  struct acpi_iort_node *smmu,
+			  u32 *sids, u32 num_sids,
+			  struct list_head *head)
+{
+	struct acpi_iort_rmr *rmr = (struct acpi_iort_rmr *)node->node_data;
+	struct acpi_iort_rmr_desc *rmr_desc;
+	int i;
+
+	rmr_desc = ACPI_ADD_PTR(struct acpi_iort_rmr_desc, node,
+				rmr->rmr_offset);
+
+	iort_rmr_desc_check_overlap(rmr_desc, rmr->rmr_count);
+
+	for (i = 0; i < rmr->rmr_count; i++, rmr_desc++) {
+		struct iommu_iort_rmr_data *rmr_data;
+		enum iommu_resv_type type;
+		int prot = IOMMU_READ | IOMMU_WRITE;
+
+		if (rmr->flags & ACPI_IORT_RMR_REMAP_PERMITTED)
+			type = IOMMU_RESV_DIRECT_RELAXABLE;
+		else
+			type = IOMMU_RESV_DIRECT;
+
+		if (rmr->flags & ACPI_IORT_RMR_ACCESS_PRIVILEGE)
+			prot |= IOMMU_PRIV;
+
+		/* Attributes 0x00 - 0x03 represents device memory */
+		if (ACPI_IORT_RMR_ACCESS_ATTRIBUTES(rmr->flags) <=
+				ACPI_IORT_RMR_ATTR_DEVICE_GRE)
+			prot |= IOMMU_MMIO;
+		else if (ACPI_IORT_RMR_ACCESS_ATTRIBUTES(rmr->flags) ==
+				ACPI_IORT_RMR_ATTR_NORMAL_IWB_OWB)
+			prot |= IOMMU_CACHE;
+
+		rmr_data = iort_rmr_alloc(rmr_desc, prot, type,
+					  sids, num_sids);
+		if (!rmr_data)
+			return;
+
+		list_add_tail(&rmr_data->rr.list, head);
+	}
+}
+
+static u32 *iort_rmr_alloc_sids(u32 *sids, u32 count, u32 id_start,
+				u32 new_count)
+{
+	u32 *new_sids;
+	u32 total_count = count + new_count;
+	int i;
+
+	new_sids = krealloc_array(sids, count + new_count,
+				  sizeof(*new_sids), GFP_KERNEL);
+	if (!new_sids)
+		return NULL;
+
+	for (i = count; i < total_count; i++)
+		new_sids[i] = id_start++;
+
+	return new_sids;
+}
+
+static bool iort_rmr_has_dev(struct device *dev, u32 id_start,
+			     u32 id_count)
+{
+	int i;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+
+	/*
+	 * Make sure the kernel has preserved the boot firmware PCIe
+	 * configuration. This is required to ensure that the RMR PCIe
+	 * StreamIDs are still valid (Refer: ARM DEN 0049E.d Section 3.1.1.5).
+	 */
+	if (dev_is_pci(dev)) {
+		struct pci_dev *pdev = to_pci_dev(dev);
+		struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
+
+		if (!host->preserve_config)
+			return false;
+	}
+
+	for (i = 0; i < fwspec->num_ids; i++) {
+		if (fwspec->ids[i] >= id_start &&
+		    fwspec->ids[i] <= id_start + id_count)
+			return true;
+	}
+
+	return false;
+}
+
+static void iort_node_get_rmr_info(struct acpi_iort_node *node,
+				   struct acpi_iort_node *iommu,
+				   struct device *dev, struct list_head *head)
+{
+	struct acpi_iort_node *smmu = NULL;
+	struct acpi_iort_rmr *rmr;
+	struct acpi_iort_id_mapping *map;
+	u32 *sids = NULL;
+	u32 num_sids = 0;
+	int i;
+
+	if (!node->mapping_offset || !node->mapping_count) {
+		pr_err(FW_BUG "Invalid ID mapping, skipping RMR node %p\n",
+		       node);
+		return;
+	}
+
+	rmr = (struct acpi_iort_rmr *)node->node_data;
+	if (!rmr->rmr_offset || !rmr->rmr_count)
+		return;
+
+	map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
+			   node->mapping_offset);
+
+	/*
+	 * Go through the ID mappings and see if we have a match for SMMU
+	 * and dev(if !NULL). If found, get the sids for the Node.
+	 * Please note, id_count is equal to the number of IDs  in the
+	 * range minus one.
+	 */
+	for (i = 0; i < node->mapping_count; i++, map++) {
+		struct acpi_iort_node *parent;
+
+		if (!map->id_count)
+			continue;
+
+		parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
+				      map->output_reference);
+		if (parent != iommu)
+			continue;
+
+		/* If dev is valid, check RMR node corresponds to the dev SID */
+		if (dev && !iort_rmr_has_dev(dev, map->output_base,
+					     map->id_count))
+			continue;
+
+		/* Retrieve SIDs associated with the Node. */
+		sids = iort_rmr_alloc_sids(sids, num_sids, map->output_base,
+					   map->id_count + 1);
+		if (!sids)
+			return;
+
+		num_sids += map->id_count + 1;
+	}
+
+	if (!sids)
+		return;
+
+	iort_get_rmrs(node, smmu, sids, num_sids, head);
+	kfree(sids);
+}
+
+static void iort_find_rmrs(struct acpi_iort_node *iommu, struct device *dev,
+			   struct list_head *head)
+{
+	struct acpi_table_iort *iort;
+	struct acpi_iort_node *iort_node, *iort_end;
+	int i;
+
+	/* Only supports ARM DEN 0049E.d onwards */
+	if (iort_table->revision < 5)
+		return;
+
+	iort = (struct acpi_table_iort *)iort_table;
+
+	iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort,
+				 iort->node_offset);
+	iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort,
+				iort_table->length);
+
+	for (i = 0; i < iort->node_count; i++) {
+		if (WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND,
+			       "IORT node pointer overflows, bad table!\n"))
+			return;
+
+		if (iort_node->type == ACPI_IORT_NODE_RMR)
+			iort_node_get_rmr_info(iort_node, iommu, dev, head);
+
+		iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
+					 iort_node->length);
+	}
+}
+
+/*
+ * Populate the RMR list associated with a given IOMMU and dev(if provided).
+ * If dev is NULL, the function populates all the RMRs associated with the
+ * given IOMMU.
+ */
+static void iort_iommu_rmr_get_resv_regions(struct fwnode_handle *iommu_fwnode,
+					    struct device *dev,
+					    struct list_head *head)
+{
+	struct acpi_iort_node *iommu;
+
+	iommu = iort_get_iort_node(iommu_fwnode);
+	if (!iommu)
+		return;
+
+	iort_find_rmrs(iommu, dev, head);
+}
+
 static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev)
 {
 	struct acpi_iort_node *iommu;
@@ -806,27 +1094,22 @@ static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev)
 	return NULL;
 }
 
-/**
- * iort_iommu_msi_get_resv_regions - Reserved region driver helper
- * @dev: Device from iommu_get_resv_regions()
- * @head: Reserved region list from iommu_get_resv_regions()
- *
- * Returns: Number of msi reserved regions on success (0 if platform
- *          doesn't require the reservation or no associated msi regions),
- *          appropriate error value otherwise. The ITS interrupt translation
- *          spaces (ITS_base + SZ_64K, SZ_64K) associated with the device
- *          are the msi reserved regions.
+/*
+ * Retrieve platform specific HW MSI reserve regions.
+ * The ITS interrupt translation spaces (ITS_base + SZ_64K, SZ_64K)
+ * associated with the device are the HW MSI reserved regions.
  */
-int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
+static void iort_iommu_msi_get_resv_regions(struct device *dev,
+					    struct list_head *head)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct acpi_iort_its_group *its;
 	struct acpi_iort_node *iommu_node, *its_node = NULL;
-	int i, resv = 0;
+	int i;
 
 	iommu_node = iort_get_msi_resv_iommu(dev);
 	if (!iommu_node)
-		return 0;
+		return;
 
 	/*
 	 * Current logic to reserve ITS regions relies on HW topologies
@@ -846,7 +1129,7 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
 	}
 
 	if (!its_node)
-		return 0;
+		return;
 
 	/* Move to ITS specific data */
 	its = (struct acpi_iort_its_group *)its_node->node_data;
@@ -860,15 +1143,52 @@ int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
 
 			region = iommu_alloc_resv_region(base + SZ_64K, SZ_64K,
 							 prot, IOMMU_RESV_MSI);
-			if (region) {
+			if (region)
 				list_add_tail(&region->list, head);
-				resv++;
-			}
 		}
 	}
+}
+
+/**
+ * iort_iommu_get_resv_regions - Generic helper to retrieve reserved regions.
+ * @dev: Device from iommu_get_resv_regions()
+ * @head: Reserved region list from iommu_get_resv_regions()
+ */
+void iort_iommu_get_resv_regions(struct device *dev, struct list_head *head)
+{
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+
+	iort_iommu_msi_get_resv_regions(dev, head);
+	iort_iommu_rmr_get_resv_regions(fwspec->iommu_fwnode, dev, head);
+}
+
+/**
+ * iort_get_rmr_sids - Retrieve IORT RMR node reserved regions with
+ *                     associated StreamIDs information.
+ * @iommu_fwnode: fwnode associated with IOMMU
+ * @head: Resereved region list
+ */
+void iort_get_rmr_sids(struct fwnode_handle *iommu_fwnode,
+		       struct list_head *head)
+{
+	iort_iommu_rmr_get_resv_regions(iommu_fwnode, NULL, head);
+}
+EXPORT_SYMBOL_GPL(iort_get_rmr_sids);
+
+/**
+ * iort_put_rmr_sids - Free memory allocated for RMR reserved regions.
+ * @iommu_fwnode: fwnode associated with IOMMU
+ * @head: Resereved region list
+ */
+void iort_put_rmr_sids(struct fwnode_handle *iommu_fwnode,
+		       struct list_head *head)
+{
+	struct iommu_resv_region *entry, *next;
 
-	return (resv == its->its_count) ? resv : -ENODEV;
+	list_for_each_entry_safe(entry, next, head, list)
+		entry->free(NULL, entry);
 }
+EXPORT_SYMBOL_GPL(iort_put_rmr_sids);
 
 static inline bool iort_iommu_driver_enabled(u8 type)
 {
@@ -1034,8 +1354,8 @@ int iort_iommu_configure_id(struct device *dev, const u32 *id_in)
 }
 
 #else
-int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
-{ return 0; }
+void iort_iommu_get_resv_regions(struct device *dev, struct list_head *head)
+{ }
 int iort_iommu_configure_id(struct device *dev, const u32 *input_id)
 { return -ENODEV; }
 #endif
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index 53cab975f612..860014b89b8e 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -41,6 +41,8 @@ struct mcfg_fixup {
 static struct mcfg_fixup mcfg_quirks[] = {
 /*	{ OEM_ID, OEM_TABLE_ID, REV, SEGMENT, BUS_RANGE, ops, cfgres }, */
 
+#ifdef CONFIG_ARM64
+
 #define AL_ECAM(table_id, rev, seg, ops) \
 	{ "AMAZON", table_id, rev, seg, MCFG_BUS_ANY, ops }
 
@@ -169,6 +171,17 @@ static struct mcfg_fixup mcfg_quirks[] = {
 	ALTRA_ECAM_QUIRK(1, 13),
 	ALTRA_ECAM_QUIRK(1, 14),
 	ALTRA_ECAM_QUIRK(1, 15),
+#endif /* ARM64 */
+
+#ifdef CONFIG_LOONGARCH
+#define LOONGSON_ECAM_MCFG(table_id, seg) \
+	{ "LOONGS", table_id, 1, seg, MCFG_BUS_ANY, &loongson_pci_ecam_ops }
+
+	LOONGSON_ECAM_MCFG("\0", 0),
+	LOONGSON_ECAM_MCFG("LOONGSON", 0),
+	LOONGSON_ECAM_MCFG("\0", 1),
+	LOONGSON_ECAM_MCFG("LOONGSON", 1),
+#endif /* LOONGARCH */
 };
 
 static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index db6ac540e924..e534fd49a67e 100644
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -151,7 +151,7 @@ void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
 	unsigned int cpu;
 
 	for_each_cpu(cpu, policy->related_cpus) {
-		struct acpi_processor *pr = per_cpu(processors, policy->cpu);
+		struct acpi_processor *pr = per_cpu(processors, cpu);
 
 		if (pr)
 			freq_qos_remove_request(&pr->thermal_req);
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e764f9ac9cf8..d4c168ce428c 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -55,14 +55,19 @@ static const guid_t ads_guid =
 	GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
 		  0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
 
+static const guid_t buffer_prop_guid =
+	GUID_INIT(0xedb12dd0, 0x363d, 0x4085,
+		  0xa3, 0xd2, 0x49, 0x52, 0x2c, 0xa1, 0x60, 0xc4);
+
 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
-					   const union acpi_object *desc,
+					   union acpi_object *desc,
 					   struct acpi_device_data *data,
 					   struct fwnode_handle *parent);
-static bool acpi_extract_properties(const union acpi_object *desc,
+static bool acpi_extract_properties(acpi_handle handle,
+				    union acpi_object *desc,
 				    struct acpi_device_data *data);
 
-static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
+static bool acpi_nondev_subnode_extract(union acpi_object *desc,
 					acpi_handle handle,
 					const union acpi_object *link,
 					struct list_head *list,
@@ -81,7 +86,7 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
 	INIT_LIST_HEAD(&dn->data.properties);
 	INIT_LIST_HEAD(&dn->data.subnodes);
 
-	result = acpi_extract_properties(desc, &dn->data);
+	result = acpi_extract_properties(handle, desc, &dn->data);
 
 	if (handle) {
 		acpi_handle scope;
@@ -155,16 +160,16 @@ static bool acpi_nondev_subnode_ok(acpi_handle scope,
 	return acpi_nondev_subnode_data_ok(handle, link, list, parent);
 }
 
-static int acpi_add_nondev_subnodes(acpi_handle scope,
-				    const union acpi_object *links,
-				    struct list_head *list,
-				    struct fwnode_handle *parent)
+static bool acpi_add_nondev_subnodes(acpi_handle scope,
+				     union acpi_object *links,
+				     struct list_head *list,
+				     struct fwnode_handle *parent)
 {
 	bool ret = false;
 	int i;
 
 	for (i = 0; i < links->package.count; i++) {
-		const union acpi_object *link, *desc;
+		union acpi_object *link, *desc;
 		acpi_handle handle;
 		bool result;
 
@@ -204,7 +209,7 @@ static int acpi_add_nondev_subnodes(acpi_handle scope,
 }
 
 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
-					   const union acpi_object *desc,
+					   union acpi_object *desc,
 					   struct acpi_device_data *data,
 					   struct fwnode_handle *parent)
 {
@@ -212,7 +217,8 @@ static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
 
 	/* Look for the ACPI data subnodes GUID. */
 	for (i = 0; i < desc->package.count; i += 2) {
-		const union acpi_object *guid, *links;
+		const union acpi_object *guid;
+		union acpi_object *links;
 
 		guid = &desc->package.elements[i];
 		links = &desc->package.elements[i + 1];
@@ -325,7 +331,7 @@ static bool acpi_is_property_guid(const guid_t *guid)
 
 struct acpi_device_properties *
 acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
-		    const union acpi_object *properties)
+		    union acpi_object *properties)
 {
 	struct acpi_device_properties *props;
 
@@ -340,7 +346,141 @@ acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
 	return props;
 }
 
-static bool acpi_extract_properties(const union acpi_object *desc,
+static void acpi_nondev_subnode_tag(acpi_handle handle, void *context)
+{
+}
+
+static void acpi_untie_nondev_subnodes(struct acpi_device_data *data)
+{
+	struct acpi_data_node *dn;
+
+	list_for_each_entry(dn, &data->subnodes, sibling) {
+		acpi_detach_data(dn->handle, acpi_nondev_subnode_tag);
+
+		acpi_untie_nondev_subnodes(&dn->data);
+	}
+}
+
+static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
+{
+	struct acpi_data_node *dn;
+
+	list_for_each_entry(dn, &data->subnodes, sibling) {
+		acpi_status status;
+		bool ret;
+
+		status = acpi_attach_data(dn->handle, acpi_nondev_subnode_tag, dn);
+		if (ACPI_FAILURE(status) && status != AE_ALREADY_EXISTS) {
+			acpi_handle_err(dn->handle, "Can't tag data node\n");
+			return false;
+		}
+
+		ret = acpi_tie_nondev_subnodes(&dn->data);
+		if (!ret)
+			return ret;
+	}
+
+	return true;
+}
+
+static void acpi_data_add_buffer_props(acpi_handle handle,
+				       struct acpi_device_data *data,
+				       union acpi_object *properties)
+{
+	struct acpi_device_properties *props;
+	union acpi_object *package;
+	size_t alloc_size;
+	unsigned int i;
+	u32 *count;
+
+	if (check_mul_overflow((size_t)properties->package.count,
+			       sizeof(*package) + sizeof(void *),
+			       &alloc_size) ||
+	    check_add_overflow(sizeof(*props) + sizeof(*package), alloc_size,
+			       &alloc_size)) {
+		acpi_handle_warn(handle,
+				 "can't allocate memory for %u buffer props",
+				 properties->package.count);
+		return;
+	}
+
+	props = kvzalloc(alloc_size, GFP_KERNEL);
+	if (!props)
+		return;
+
+	props->guid = &buffer_prop_guid;
+	props->bufs = (void *)(props + 1);
+	props->properties = (void *)(props->bufs + properties->package.count);
+
+	/* Outer package */
+	package = props->properties;
+	package->type = ACPI_TYPE_PACKAGE;
+	package->package.elements = package + 1;
+	count = &package->package.count;
+	*count = 0;
+
+	/* Inner packages */
+	package++;
+
+	for (i = 0; i < properties->package.count; i++) {
+		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+		union acpi_object *property = &properties->package.elements[i];
+		union acpi_object *prop, *obj, *buf_obj;
+		acpi_status status;
+
+		if (property->type != ACPI_TYPE_PACKAGE ||
+		    property->package.count != 2) {
+			acpi_handle_warn(handle,
+					 "buffer property %u has %u entries\n",
+					 i, property->package.count);
+			continue;
+		}
+
+		prop = &property->package.elements[0];
+		obj = &property->package.elements[1];
+
+		if (prop->type != ACPI_TYPE_STRING ||
+		    obj->type != ACPI_TYPE_STRING) {
+			acpi_handle_warn(handle,
+					 "wrong object types %u and %u\n",
+					 prop->type, obj->type);
+			continue;
+		}
+
+		status = acpi_evaluate_object_typed(handle, obj->string.pointer,
+						    NULL, &buf,
+						    ACPI_TYPE_BUFFER);
+		if (ACPI_FAILURE(status)) {
+			acpi_handle_warn(handle,
+					 "can't evaluate \"%*pE\" as buffer\n",
+					 obj->string.length,
+					 obj->string.pointer);
+			continue;
+		}
+
+		package->type = ACPI_TYPE_PACKAGE;
+		package->package.elements = prop;
+		package->package.count = 2;
+
+		buf_obj = buf.pointer;
+
+		/* Replace the string object with a buffer object */
+		obj->type = ACPI_TYPE_BUFFER;
+		obj->buffer.length = buf_obj->buffer.length;
+		obj->buffer.pointer = buf_obj->buffer.pointer;
+
+		props->bufs[i] = buf.pointer;
+		package++;
+		(*count)++;
+	}
+
+	if (*count)
+		list_add(&props->list, &data->properties);
+	else
+		kvfree(props);
+}
+
+static bool acpi_extract_properties(acpi_handle scope, union acpi_object *desc,
 				    struct acpi_device_data *data)
 {
 	int i;
@@ -350,7 +490,8 @@ static bool acpi_extract_properties(const union acpi_object *desc,
 
 	/* Look for the device properties GUID. */
 	for (i = 0; i < desc->package.count; i += 2) {
-		const union acpi_object *guid, *properties;
+		const union acpi_object *guid;
+		union acpi_object *properties;
 
 		guid = &desc->package.elements[i];
 		properties = &desc->package.elements[i + 1];
@@ -364,6 +505,12 @@ static bool acpi_extract_properties(const union acpi_object *desc,
 		    properties->type != ACPI_TYPE_PACKAGE)
 			break;
 
+		if (guid_equal((guid_t *)guid->buffer.pointer,
+			       &buffer_prop_guid)) {
+			acpi_data_add_buffer_props(scope, data, properties);
+			continue;
+		}
+
 		if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
 			continue;
 
@@ -410,7 +557,7 @@ void acpi_init_properties(struct acpi_device *adev)
 	if (ACPI_FAILURE(status))
 		goto out;
 
-	if (acpi_extract_properties(buf.pointer, &adev->data)) {
+	if (acpi_extract_properties(adev->handle, buf.pointer, &adev->data)) {
 		adev->data.pointer = buf.pointer;
 		if (acpi_of)
 			acpi_init_of_compatible(adev);
@@ -422,6 +569,9 @@ void acpi_init_properties(struct acpi_device *adev)
 	if (!adev->data.pointer) {
 		acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
 		ACPI_FREE(buf.pointer);
+	} else {
+		if (!acpi_tie_nondev_subnodes(&adev->data))
+			acpi_untie_nondev_subnodes(&adev->data);
 	}
 
  out:
@@ -438,8 +588,14 @@ static void acpi_free_device_properties(struct list_head *list)
 	struct acpi_device_properties *props, *tmp;
 
 	list_for_each_entry_safe(props, tmp, list, list) {
+		u32 i;
+
 		list_del(&props->list);
-		kfree(props);
+		/* Buffer data properties were separately allocated */
+		if (props->bufs)
+			for (i = 0; i < props->properties->package.count; i++)
+				ACPI_FREE(props->bufs[i]);
+		kvfree(props);
 	}
 }
 
@@ -462,6 +618,7 @@ static void acpi_destroy_nondev_subnodes(struct list_head *list)
 
 void acpi_free_properties(struct acpi_device *adev)
 {
+	acpi_untie_nondev_subnodes(&adev->data);
 	acpi_destroy_nondev_subnodes(&adev->data.subnodes);
 	ACPI_FREE((void *)adev->data.pointer);
 	adev->data.of_compatible = NULL;
@@ -633,6 +790,58 @@ acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
 	return NULL;
 }
 
+static int acpi_get_ref_args(struct fwnode_reference_args *args,
+			     struct fwnode_handle *ref_fwnode,
+			     const union acpi_object **element,
+			     const union acpi_object *end, size_t num_args)
+{
+	u32 nargs = 0, i;
+
+	/*
+	 * Find the referred data extension node under the
+	 * referred device node.
+	 */
+	for (; *element < end && (*element)->type == ACPI_TYPE_STRING;
+	     (*element)++) {
+		const char *child_name = (*element)->string.pointer;
+
+		ref_fwnode = acpi_fwnode_get_named_child_node(ref_fwnode, child_name);
+		if (!ref_fwnode)
+			return -EINVAL;
+	}
+
+	/*
+	 * Assume the following integer elements are all args. Stop counting on
+	 * the first reference or end of the package arguments. In case of
+	 * neither reference, nor integer, return an error, we can't parse it.
+	 */
+	for (i = 0; (*element) + i < end && i < num_args; i++) {
+		acpi_object_type type = (*element)[i].type;
+
+		if (type == ACPI_TYPE_LOCAL_REFERENCE)
+			break;
+
+		if (type == ACPI_TYPE_INTEGER)
+			nargs++;
+		else
+			return -EINVAL;
+	}
+
+	if (nargs > NR_FWNODE_REFERENCE_ARGS)
+		return -EINVAL;
+
+	if (args) {
+		args->fwnode = ref_fwnode;
+		args->nargs = nargs;
+		for (i = 0; i < nargs; i++)
+			args->args[i] = (*element)[i].integer.value;
+	}
+
+	(*element) += nargs;
+
+	return 0;
+}
+
 /**
  * __acpi_node_get_property_reference - returns handle to the referenced object
  * @fwnode: Firmware node to get the property from
@@ -686,11 +895,9 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 	if (ret)
 		return ret == -EINVAL ? -ENOENT : -EINVAL;
 
-	/*
-	 * The simplest case is when the value is a single reference.  Just
-	 * return that reference then.
-	 */
-	if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
+	switch (obj->type) {
+	case ACPI_TYPE_LOCAL_REFERENCE:
+		/* Plain single reference without arguments. */
 		if (index)
 			return -ENOENT;
 
@@ -701,19 +908,21 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 		args->fwnode = acpi_fwnode_handle(device);
 		args->nargs = 0;
 		return 0;
+	case ACPI_TYPE_PACKAGE:
+		/*
+		 * If it is not a single reference, then it is a package of
+		 * references followed by number of ints as follows:
+		 *
+		 *  Package () { REF, INT, REF, INT, INT }
+		 *
+		 * The index argument is then used to determine which reference
+		 * the caller wants (along with the arguments).
+		 */
+		break;
+	default:
+		return -EINVAL;
 	}
 
-	/*
-	 * If it is not a single reference, then it is a package of
-	 * references followed by number of ints as follows:
-	 *
-	 *  Package () { REF, INT, REF, INT, INT }
-	 *
-	 * The index argument is then used to determine which reference
-	 * the caller wants (along with the arguments).
-	 */
-	if (obj->type != ACPI_TYPE_PACKAGE)
-		return -EINVAL;
 	if (index >= obj->package.count)
 		return -ENOENT;
 
@@ -721,66 +930,30 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 	end = element + obj->package.count;
 
 	while (element < end) {
-		u32 nargs, i;
-
-		if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
-			struct fwnode_handle *ref_fwnode;
-
+		switch (element->type) {
+		case ACPI_TYPE_LOCAL_REFERENCE:
 			device = acpi_fetch_acpi_dev(element->reference.handle);
 			if (!device)
 				return -EINVAL;
 
-			nargs = 0;
 			element++;
 
-			/*
-			 * Find the referred data extension node under the
-			 * referred device node.
-			 */
-			for (ref_fwnode = acpi_fwnode_handle(device);
-			     element < end && element->type == ACPI_TYPE_STRING;
-			     element++) {
-				ref_fwnode = acpi_fwnode_get_named_child_node(
-					ref_fwnode, element->string.pointer);
-				if (!ref_fwnode)
-					return -EINVAL;
-			}
-
-			/*
-			 * Assume the following integer elements are all args.
-			 * Stop counting on the first reference or end of the
-			 * package arguments. In case of neither reference,
-			 * nor integer, return an error, we can't parse it.
-			 */
-			for (i = 0; element + i < end && i < num_args; i++) {
-				int type = element[i].type;
-
-				if (type == ACPI_TYPE_LOCAL_REFERENCE)
-					break;
-				if (type == ACPI_TYPE_INTEGER)
-					nargs++;
-				else
-					return -EINVAL;
-			}
-
-			if (nargs > NR_FWNODE_REFERENCE_ARGS)
-				return -EINVAL;
-
-			if (idx == index) {
-				args->fwnode = ref_fwnode;
-				args->nargs = nargs;
-				for (i = 0; i < nargs; i++)
-					args->args[i] = element[i].integer.value;
+			ret = acpi_get_ref_args(idx == index ? args : NULL,
+						acpi_fwnode_handle(device),
+						&element, end, num_args);
+			if (ret < 0)
+				return ret;
 
+			if (idx == index)
 				return 0;
-			}
 
-			element += nargs;
-		} else if (element->type == ACPI_TYPE_INTEGER) {
+			break;
+		case ACPI_TYPE_INTEGER:
 			if (idx == index)
 				return -ENOENT;
 			element++;
-		} else {
+			break;
+		default:
 			return -EINVAL;
 		}
 
@@ -852,67 +1025,36 @@ static int acpi_data_prop_read_single(const struct acpi_device_data *data,
 	return ret;
 }
 
-static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
-				       size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-		if (items[i].integer.value > U8_MAX)
-			return -EOVERFLOW;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
-
-static int acpi_copy_property_array_u16(const union acpi_object *items,
-					u16 *val, size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-		if (items[i].integer.value > U16_MAX)
-			return -EOVERFLOW;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
-
-static int acpi_copy_property_array_u32(const union acpi_object *items,
-					u32 *val, size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-		if (items[i].integer.value > U32_MAX)
-			return -EOVERFLOW;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
-
-static int acpi_copy_property_array_u64(const union acpi_object *items,
-					u64 *val, size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
+#define acpi_copy_property_array_uint(items, val, nval)			\
+	({								\
+		typeof(items) __items = items;				\
+		typeof(val) __val = val;				\
+		typeof(nval) __nval = nval;				\
+		size_t i;						\
+		int ret = 0;						\
+									\
+		for (i = 0; i < __nval; i++) {				\
+			if (__items->type == ACPI_TYPE_BUFFER) {	\
+				__val[i] = __items->buffer.pointer[i];	\
+				continue;				\
+			}						\
+			if (__items[i].type != ACPI_TYPE_INTEGER) {	\
+				ret = -EPROTO;				\
+				break;					\
+			}						\
+			if (__items[i].integer.value > _Generic(__val,	\
+								u8 *: U8_MAX, \
+								u16 *: U16_MAX, \
+								u32 *: U32_MAX, \
+								u64 *: U64_MAX)) { \
+				ret = -EOVERFLOW;			\
+				break;					\
+			}						\
+									\
+			__val[i] = __items[i].integer.value;		\
+		}							\
+		ret;							\
+	})
 
 static int acpi_copy_property_array_string(const union acpi_object *items,
 					   char **val, size_t nval)
@@ -954,31 +1096,54 @@ static int acpi_data_prop_read(const struct acpi_device_data *data,
 	}
 
 	ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
+	if (ret && proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64)
+		ret = acpi_data_get_property(data, propname, ACPI_TYPE_BUFFER,
+					     &obj);
 	if (ret)
 		return ret;
 
-	if (!val)
+	if (!val) {
+		if (obj->type == ACPI_TYPE_BUFFER)
+			return obj->buffer.length;
+
 		return obj->package.count;
+	}
 
-	if (proptype != DEV_PROP_STRING && nval > obj->package.count)
-		return -EOVERFLOW;
+	switch (proptype) {
+	case DEV_PROP_STRING:
+		break;
+	case DEV_PROP_U8 ... DEV_PROP_U64:
+		if (obj->type == ACPI_TYPE_BUFFER) {
+			if (nval > obj->buffer.length)
+				return -EOVERFLOW;
+			break;
+		}
+		fallthrough;
+	default:
+		if (nval > obj->package.count)
+			return -EOVERFLOW;
+		break;
+	}
 	if (nval == 0)
 		return -EINVAL;
 
-	items = obj->package.elements;
+	if (obj->type != ACPI_TYPE_BUFFER)
+		items = obj->package.elements;
+	else
+		items = obj;
 
 	switch (proptype) {
 	case DEV_PROP_U8:
-		ret = acpi_copy_property_array_u8(items, (u8 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u8 *)val, nval);
 		break;
 	case DEV_PROP_U16:
-		ret = acpi_copy_property_array_u16(items, (u16 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u16 *)val, nval);
 		break;
 	case DEV_PROP_U32:
-		ret = acpi_copy_property_array_u32(items, (u32 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u32 *)val, nval);
 		break;
 	case DEV_PROP_U64:
-		ret = acpi_copy_property_array_u64(items, (u64 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u64 *)val, nval);
 		break;
 	case DEV_PROP_STRING:
 		ret = acpi_copy_property_array_string(
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b100e6ca9bb4..42cec8120f18 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1722,6 +1722,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 		{"INT3515", },
 		/* Non-conforming _HID for Cirrus Logic already released */
 		{"CLSA0100", },
+		{"CLSA0101", },
 	/*
 	 * Some ACPI devs contain SerialBus resources even though they are not
 	 * attached to a serial bus at all.
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 3a9773a09e19..5a7b8065e77f 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -291,6 +291,44 @@ int acpi_get_local_address(acpi_handle handle, u32 *addr)
 }
 EXPORT_SYMBOL(acpi_get_local_address);
 
+#define ACPI_MAX_SUB_BUF_SIZE	9
+
+const char *acpi_get_subsystem_id(acpi_handle handle)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+	const char *sub;
+	size_t len;
+
+	status = acpi_evaluate_object(handle, METHOD_NAME__SUB, NULL, &buffer);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_debug(handle, "Reading ACPI _SUB failed: %#x\n", status);
+		return ERR_PTR(-ENODATA);
+	}
+
+	obj = buffer.pointer;
+	if (obj->type == ACPI_TYPE_STRING) {
+		len = strlen(obj->string.pointer);
+		if (len < ACPI_MAX_SUB_BUF_SIZE && len > 0) {
+			sub = kstrdup(obj->string.pointer, GFP_KERNEL);
+			if (!sub)
+				sub = ERR_PTR(-ENOMEM);
+		} else {
+			acpi_handle_err(handle, "ACPI _SUB Length %zu is Invalid\n", len);
+			sub = ERR_PTR(-ENODATA);
+		}
+	} else {
+		acpi_handle_warn(handle, "Warning ACPI _SUB did not return a string\n");
+		sub = ERR_PTR(-ENODATA);
+	}
+
+	acpi_os_free(buffer.pointer);
+
+	return sub;
+}
+EXPORT_SYMBOL_GPL(acpi_get_subsystem_id);
+
 acpi_status
 acpi_evaluate_reference(acpi_handle handle,
 			acpi_string pathname,
diff --git a/drivers/acpi/viot.c b/drivers/acpi/viot.c
index 647f11cf165d..6132092dab2a 100644
--- a/drivers/acpi/viot.c
+++ b/drivers/acpi/viot.c
@@ -88,7 +88,7 @@ static int __init viot_get_pci_iommu_fwnode(struct viot_iommu *viommu,
 		return -ENODEV;
 	}
 
-	fwnode = pdev->dev.fwnode;
+	fwnode = dev_fwnode(&pdev->dev);
 	if (!fwnode) {
 		/*
 		 * PCI devices aren't necessarily described by ACPI. Create a
@@ -101,7 +101,7 @@ static int __init viot_get_pci_iommu_fwnode(struct viot_iommu *viommu,
 		}
 		set_primary_fwnode(&pdev->dev, fwnode);
 	}
-	viommu->fwnode = pdev->dev.fwnode;
+	viommu->fwnode = dev_fwnode(&pdev->dev);
 	pci_dev_put(pdev);
 	return 0;
 }
@@ -314,7 +314,7 @@ static int viot_dev_iommu_init(struct device *dev, struct viot_iommu *viommu,
 		return -ENODEV;
 
 	/* We're not translating ourself */
-	if (viommu->fwnode == dev->fwnode)
+	if (device_match_fwnode(dev, viommu->fwnode))
 		return -EINVAL;
 
 	ops = iommu_ops_from_fwnode(viommu->fwnode);