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[Xen-devel] [RFC v2 4/7] ACPI: arm: Support for IORT



Verbatim files from Linux kernel.
iort.c: commit d89cf2e41826: ACPI/IORT: Fix the indentation in
iort_scan_node()
acpi_iort.h: commit 18b709beb503:ACPI/IORT: Make dma masks set-up IORT
specific

Signed-off-by: Sameer Goel <sgoel@xxxxxxxxxxxxxx>
---
 xen/drivers/acpi/arm/iort.c  | 961 +++++++++++++++++++++++++++++++++++++++++++
 xen/include/acpi/acpi_iort.h |  58 +++
 2 files changed, 1019 insertions(+)
 create mode 100644 xen/drivers/acpi/arm/iort.c
 create mode 100644 xen/include/acpi/acpi_iort.h

diff --git a/xen/drivers/acpi/arm/iort.c b/xen/drivers/acpi/arm/iort.c
new file mode 100644
index 0000000..2e368a6
--- /dev/null
+++ b/xen/drivers/acpi/arm/iort.c
@@ -0,0 +1,961 @@
+/*
+ * Copyright (C) 2016, Semihalf
+ *     Author: Tomasz Nowicki <tn@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * This file implements early detection/parsing of I/O mapping
+ * reported to OS through firmware via I/O Remapping Table (IORT)
+ * IORT document number: ARM DEN 0049A
+ */
+
+#define pr_fmt(fmt)    "ACPI: IORT: " fmt
+
+#include <linux/acpi_iort.h>
+#include <linux/iommu.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define IORT_TYPE_MASK(type)   (1 << (type))
+#define IORT_MSI_TYPE          (1 << ACPI_IORT_NODE_ITS_GROUP)
+#define IORT_IOMMU_TYPE                ((1 << ACPI_IORT_NODE_SMMU) |   \
+                               (1 << ACPI_IORT_NODE_SMMU_V3))
+
+struct iort_its_msi_chip {
+       struct list_head        list;
+       struct fwnode_handle    *fw_node;
+       u32                     translation_id;
+};
+
+struct iort_fwnode {
+       struct list_head list;
+       struct acpi_iort_node *iort_node;
+       struct fwnode_handle *fwnode;
+};
+static LIST_HEAD(iort_fwnode_list);
+static DEFINE_SPINLOCK(iort_fwnode_lock);
+
+/**
+ * iort_set_fwnode() - Create iort_fwnode and use it to register
+ *                    iommu data in the iort_fwnode_list
+ *
+ * @node: IORT table node associated with the IOMMU
+ * @fwnode: fwnode associated with the IORT node
+ *
+ * Returns: 0 on success
+ *          <0 on failure
+ */
+static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
+                                 struct fwnode_handle *fwnode)
+{
+       struct iort_fwnode *np;
+
+       np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC);
+
+       if (WARN_ON(!np))
+               return -ENOMEM;
+
+       INIT_LIST_HEAD(&np->list);
+       np->iort_node = iort_node;
+       np->fwnode = fwnode;
+
+       spin_lock(&iort_fwnode_lock);
+       list_add_tail(&np->list, &iort_fwnode_list);
+       spin_unlock(&iort_fwnode_lock);
+
+       return 0;
+}
+
+/**
+ * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
+ *
+ * @node: IORT table node to be looked-up
+ *
+ * Returns: fwnode_handle pointer on success, NULL on failure
+ */
+static inline
+struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node)
+{
+       struct iort_fwnode *curr;
+       struct fwnode_handle *fwnode = NULL;
+
+       spin_lock(&iort_fwnode_lock);
+       list_for_each_entry(curr, &iort_fwnode_list, list) {
+               if (curr->iort_node == node) {
+                       fwnode = curr->fwnode;
+                       break;
+               }
+       }
+       spin_unlock(&iort_fwnode_lock);
+
+       return fwnode;
+}
+
+/**
+ * iort_delete_fwnode() - Delete fwnode associated with an IORT node
+ *
+ * @node: IORT table node associated with fwnode to delete
+ */
+static inline void iort_delete_fwnode(struct acpi_iort_node *node)
+{
+       struct iort_fwnode *curr, *tmp;
+
+       spin_lock(&iort_fwnode_lock);
+       list_for_each_entry_safe(curr, tmp, &iort_fwnode_list, list) {
+               if (curr->iort_node == node) {
+                       list_del(&curr->list);
+                       kfree(curr);
+                       break;
+               }
+       }
+       spin_unlock(&iort_fwnode_lock);
+}
+
+typedef acpi_status (*iort_find_node_callback)
+       (struct acpi_iort_node *node, void *context);
+
+/* Root pointer to the mapped IORT table */
+static struct acpi_table_header *iort_table;
+
+static LIST_HEAD(iort_msi_chip_list);
+static DEFINE_SPINLOCK(iort_msi_chip_lock);
+
+/**
+ * iort_register_domain_token() - register domain token and related ITS ID
+ * to the list from where we can get it back later on.
+ * @trans_id: ITS ID.
+ * @fw_node: Domain token.
+ *
+ * Returns: 0 on success, -ENOMEM if no memory when allocating list element
+ */
+int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node)
+{
+       struct iort_its_msi_chip *its_msi_chip;
+
+       its_msi_chip = kzalloc(sizeof(*its_msi_chip), GFP_KERNEL);
+       if (!its_msi_chip)
+               return -ENOMEM;
+
+       its_msi_chip->fw_node = fw_node;
+       its_msi_chip->translation_id = trans_id;
+
+       spin_lock(&iort_msi_chip_lock);
+       list_add(&its_msi_chip->list, &iort_msi_chip_list);
+       spin_unlock(&iort_msi_chip_lock);
+
+       return 0;
+}
+
+/**
+ * iort_deregister_domain_token() - Deregister domain token based on ITS ID
+ * @trans_id: ITS ID.
+ *
+ * Returns: none.
+ */
+void iort_deregister_domain_token(int trans_id)
+{
+       struct iort_its_msi_chip *its_msi_chip, *t;
+
+       spin_lock(&iort_msi_chip_lock);
+       list_for_each_entry_safe(its_msi_chip, t, &iort_msi_chip_list, list) {
+               if (its_msi_chip->translation_id == trans_id) {
+                       list_del(&its_msi_chip->list);
+                       kfree(its_msi_chip);
+                       break;
+               }
+       }
+       spin_unlock(&iort_msi_chip_lock);
+}
+
+/**
+ * iort_find_domain_token() - Find domain token based on given ITS ID
+ * @trans_id: ITS ID.
+ *
+ * Returns: domain token when find on the list, NULL otherwise
+ */
+struct fwnode_handle *iort_find_domain_token(int trans_id)
+{
+       struct fwnode_handle *fw_node = NULL;
+       struct iort_its_msi_chip *its_msi_chip;
+
+       spin_lock(&iort_msi_chip_lock);
+       list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
+               if (its_msi_chip->translation_id == trans_id) {
+                       fw_node = its_msi_chip->fw_node;
+                       break;
+               }
+       }
+       spin_unlock(&iort_msi_chip_lock);
+
+       return fw_node;
+}
+
+static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
+                                            iort_find_node_callback callback,
+                                            void *context)
+{
+       struct acpi_iort_node *iort_node, *iort_end;
+       struct acpi_table_iort *iort;
+       int i;
+
+       if (!iort_table)
+               return NULL;
+
+       /* Get the first IORT node */
+       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_table,
+                               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 NULL;
+
+               if (iort_node->type == type &&
+                   ACPI_SUCCESS(callback(iort_node, context)))
+                       return iort_node;
+
+               iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
+                                        iort_node->length);
+       }
+
+       return NULL;
+}
+
+static acpi_status
+iort_match_type_callback(struct acpi_iort_node *node, void *context)
+{
+       return AE_OK;
+}
+
+bool iort_node_match(u8 type)
+{
+       struct acpi_iort_node *node;
+
+       node = iort_scan_node(type, iort_match_type_callback, NULL);
+
+       return node != NULL;
+}
+
+static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
+                                           void *context)
+{
+       struct device *dev = context;
+       acpi_status status;
+
+       if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
+               struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
+               struct acpi_device *adev = to_acpi_device_node(dev->fwnode);
+               struct acpi_iort_named_component *ncomp;
+
+               if (!adev) {
+                       status = AE_NOT_FOUND;
+                       goto out;
+               }
+
+               status = acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &buf);
+               if (ACPI_FAILURE(status)) {
+                       dev_warn(dev, "Can't get device full path name\n");
+                       goto out;
+               }
+
+               ncomp = (struct acpi_iort_named_component *)node->node_data;
+               status = !strcmp(ncomp->device_name, buf.pointer) ?
+                                                       AE_OK : AE_NOT_FOUND;
+               acpi_os_free(buf.pointer);
+       } else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
+               struct acpi_iort_root_complex *pci_rc;
+               struct pci_bus *bus;
+
+               bus = to_pci_bus(dev);
+               pci_rc = (struct acpi_iort_root_complex *)node->node_data;
+
+               /*
+                * It is assumed that PCI segment numbers maps one-to-one
+                * with root complexes. Each segment number can represent only
+                * one root complex.
+                */
+               status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
+                                                       AE_OK : AE_NOT_FOUND;
+       } else {
+               status = AE_NOT_FOUND;
+       }
+out:
+       return status;
+}
+
+static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
+                      u32 *rid_out)
+{
+       /* Single mapping does not care for input id */
+       if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
+               if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
+                   type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
+                       *rid_out = map->output_base;
+                       return 0;
+               }
+
+               pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for 
node type %d, skipping ID map\n",
+                       map, type);
+               return -ENXIO;
+       }
+
+       if (rid_in < map->input_base ||
+           (rid_in >= map->input_base + map->id_count))
+               return -ENXIO;
+
+       *rid_out = map->output_base + (rid_in - map->input_base);
+       return 0;
+}
+
+static
+struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
+                                       u32 *id_out, u8 type_mask,
+                                       int index)
+{
+       struct acpi_iort_node *parent;
+       struct acpi_iort_id_mapping *map;
+
+       if (!node->mapping_offset || !node->mapping_count ||
+                                    index >= node->mapping_count)
+               return NULL;
+
+       map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
+                          node->mapping_offset + index * sizeof(*map));
+
+       /* Firmware bug! */
+       if (!map->output_reference) {
+               pr_err(FW_BUG "[node %p type %d] ID map has NULL parent 
reference\n",
+                      node, node->type);
+               return NULL;
+       }
+
+       parent = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
+                              map->output_reference);
+
+       if (!(IORT_TYPE_MASK(parent->type) & type_mask))
+               return NULL;
+
+       if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
+               if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
+                   node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
+                       *id_out = map->output_base;
+                       return parent;
+               }
+       }
+
+       return NULL;
+}
+
+static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
+                                               u32 rid_in, u32 *rid_out,
+                                               u8 type_mask)
+{
+       u32 rid = rid_in;
+
+       /* Parse the ID mapping tree to find specified node type */
+       while (node) {
+               struct acpi_iort_id_mapping *map;
+               int i;
+
+               if (IORT_TYPE_MASK(node->type) & type_mask) {
+                       if (rid_out)
+                               *rid_out = rid;
+                       return node;
+               }
+
+               if (!node->mapping_offset || !node->mapping_count)
+                       goto fail_map;
+
+               map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
+                                  node->mapping_offset);
+
+               /* Firmware bug! */
+               if (!map->output_reference) {
+                       pr_err(FW_BUG "[node %p type %d] ID map has NULL parent 
reference\n",
+                              node, node->type);
+                       goto fail_map;
+               }
+
+               /* Do the RID translation */
+               for (i = 0; i < node->mapping_count; i++, map++) {
+                       if (!iort_id_map(map, node->type, rid, &rid))
+                               break;
+               }
+
+               if (i == node->mapping_count)
+                       goto fail_map;
+
+               node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
+                                   map->output_reference);
+       }
+
+fail_map:
+       /* Map input RID to output RID unchanged on mapping failure*/
+       if (rid_out)
+               *rid_out = rid_in;
+
+       return NULL;
+}
+
+static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
+{
+       struct pci_bus *pbus;
+
+       if (!dev_is_pci(dev))
+               return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
+                                     iort_match_node_callback, dev);
+
+       /* Find a PCI root bus */
+       pbus = to_pci_dev(dev)->bus;
+       while (!pci_is_root_bus(pbus))
+               pbus = pbus->parent;
+
+       return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
+                             iort_match_node_callback, &pbus->dev);
+}
+
+/**
+ * iort_msi_map_rid() - Map a MSI requester ID for a device
+ * @dev: The device for which the mapping is to be done.
+ * @req_id: The device requester ID.
+ *
+ * Returns: mapped MSI RID on success, input requester ID otherwise
+ */
+u32 iort_msi_map_rid(struct device *dev, u32 req_id)
+{
+       struct acpi_iort_node *node;
+       u32 dev_id;
+
+       node = iort_find_dev_node(dev);
+       if (!node)
+               return req_id;
+
+       iort_node_map_rid(node, req_id, &dev_id, IORT_MSI_TYPE);
+       return dev_id;
+}
+
+/**
+ * iort_dev_find_its_id() - Find the ITS identifier for a device
+ * @dev: The device.
+ * @idx: Index of the ITS identifier list.
+ * @its_id: ITS identifier.
+ *
+ * Returns: 0 on success, appropriate error value otherwise
+ */
+static int iort_dev_find_its_id(struct device *dev, u32 req_id,
+                               unsigned int idx, int *its_id)
+{
+       struct acpi_iort_its_group *its;
+       struct acpi_iort_node *node;
+
+       node = iort_find_dev_node(dev);
+       if (!node)
+               return -ENXIO;
+
+       node = iort_node_map_rid(node, req_id, NULL, IORT_MSI_TYPE);
+       if (!node)
+               return -ENXIO;
+
+       /* Move to ITS specific data */
+       its = (struct acpi_iort_its_group *)node->node_data;
+       if (idx > its->its_count) {
+               dev_err(dev, "requested ITS ID index [%d] is greater than 
available [%d]\n",
+                       idx, its->its_count);
+               return -ENXIO;
+       }
+
+       *its_id = its->identifiers[idx];
+       return 0;
+}
+
+/**
+ * iort_get_device_domain() - Find MSI domain related to a device
+ * @dev: The device.
+ * @req_id: Requester ID for the device.
+ *
+ * Returns: the MSI domain for this device, NULL otherwise
+ */
+struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
+{
+       struct fwnode_handle *handle;
+       int its_id;
+
+       if (iort_dev_find_its_id(dev, req_id, 0, &its_id))
+               return NULL;
+
+       handle = iort_find_domain_token(its_id);
+       if (!handle)
+               return NULL;
+
+       return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
+}
+
+static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
+{
+       u32 *rid = data;
+
+       *rid = alias;
+       return 0;
+}
+
+static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
+                              struct fwnode_handle *fwnode,
+                              const struct iommu_ops *ops)
+{
+       int ret = iommu_fwspec_init(dev, fwnode, ops);
+
+       if (!ret)
+               ret = iommu_fwspec_add_ids(dev, &streamid, 1);
+
+       return ret;
+}
+
+static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
+                                       struct acpi_iort_node *node,
+                                       u32 streamid)
+{
+       const struct iommu_ops *ops = NULL;
+       int ret = -ENODEV;
+       struct fwnode_handle *iort_fwnode;
+
+       if (node) {
+               iort_fwnode = iort_get_fwnode(node);
+               if (!iort_fwnode)
+                       return NULL;
+
+               ops = iommu_ops_from_fwnode(iort_fwnode);
+               if (!ops)
+                       return NULL;
+
+               ret = arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
+       }
+
+       return ret ? NULL : ops;
+}
+
+/**
+ * iort_set_dma_mask - Set-up dma mask for a device.
+ *
+ * @dev: device to configure
+ */
+void iort_set_dma_mask(struct device *dev)
+{
+       /*
+        * Set default coherent_dma_mask to 32 bit.  Drivers are expected to
+        * setup the correct supported mask.
+        */
+       if (!dev->coherent_dma_mask)
+               dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+       /*
+        * Set it to coherent_dma_mask by default if the architecture
+        * code has not set it.
+        */
+       if (!dev->dma_mask)
+               dev->dma_mask = &dev->coherent_dma_mask;
+}
+
+/**
+ * iort_iommu_configure - Set-up IOMMU configuration for a device.
+ *
+ * @dev: device to configure
+ *
+ * Returns: iommu_ops pointer on configuration success
+ *          NULL on configuration failure
+ */
+const struct iommu_ops *iort_iommu_configure(struct device *dev)
+{
+       struct acpi_iort_node *node, *parent;
+       const struct iommu_ops *ops = NULL;
+       u32 streamid = 0;
+
+       if (dev_is_pci(dev)) {
+               struct pci_bus *bus = to_pci_dev(dev)->bus;
+               u32 rid;
+
+               pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid,
+                                      &rid);
+
+               node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
+                                     iort_match_node_callback, &bus->dev);
+               if (!node)
+                       return NULL;
+
+               parent = iort_node_map_rid(node, rid, &streamid,
+                                          IORT_IOMMU_TYPE);
+
+               ops = iort_iommu_xlate(dev, parent, streamid);
+
+       } else {
+               int i = 0;
+
+               node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
+                                     iort_match_node_callback, dev);
+               if (!node)
+                       return NULL;
+
+               parent = iort_node_get_id(node, &streamid,
+                                         IORT_IOMMU_TYPE, i++);
+
+               while (parent) {
+                       ops = iort_iommu_xlate(dev, parent, streamid);
+
+                       parent = iort_node_get_id(node, &streamid,
+                                                 IORT_IOMMU_TYPE, i++);
+               }
+       }
+
+       return ops;
+}
+
+static void __init acpi_iort_register_irq(int hwirq, const char *name,
+                                         int trigger,
+                                         struct resource *res)
+{
+       int irq = acpi_register_gsi(NULL, hwirq, trigger,
+                                   ACPI_ACTIVE_HIGH);
+
+       if (irq <= 0) {
+               pr_err("could not register gsi hwirq %d name [%s]\n", hwirq,
+                                                                     name);
+               return;
+       }
+
+       res->start = irq;
+       res->end = irq;
+       res->flags = IORESOURCE_IRQ;
+       res->name = name;
+}
+
+static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node)
+{
+       struct acpi_iort_smmu_v3 *smmu;
+       /* Always present mem resource */
+       int num_res = 1;
+
+       /* Retrieve SMMUv3 specific data */
+       smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
+
+       if (smmu->event_gsiv)
+               num_res++;
+
+       if (smmu->pri_gsiv)
+               num_res++;
+
+       if (smmu->gerr_gsiv)
+               num_res++;
+
+       if (smmu->sync_gsiv)
+               num_res++;
+
+       return num_res;
+}
+
+static void __init arm_smmu_v3_init_resources(struct resource *res,
+                                             struct acpi_iort_node *node)
+{
+       struct acpi_iort_smmu_v3 *smmu;
+       int num_res = 0;
+
+       /* Retrieve SMMUv3 specific data */
+       smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
+
+       res[num_res].start = smmu->base_address;
+       res[num_res].end = smmu->base_address + SZ_128K - 1;
+       res[num_res].flags = IORESOURCE_MEM;
+
+       num_res++;
+
+       if (smmu->event_gsiv)
+               acpi_iort_register_irq(smmu->event_gsiv, "eventq",
+                                      ACPI_EDGE_SENSITIVE,
+                                      &res[num_res++]);
+
+       if (smmu->pri_gsiv)
+               acpi_iort_register_irq(smmu->pri_gsiv, "priq",
+                                      ACPI_EDGE_SENSITIVE,
+                                      &res[num_res++]);
+
+       if (smmu->gerr_gsiv)
+               acpi_iort_register_irq(smmu->gerr_gsiv, "gerror",
+                                      ACPI_EDGE_SENSITIVE,
+                                      &res[num_res++]);
+
+       if (smmu->sync_gsiv)
+               acpi_iort_register_irq(smmu->sync_gsiv, "cmdq-sync",
+                                      ACPI_EDGE_SENSITIVE,
+                                      &res[num_res++]);
+}
+
+static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
+{
+       struct acpi_iort_smmu_v3 *smmu;
+
+       /* Retrieve SMMUv3 specific data */
+       smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
+
+       return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
+}
+
+static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
+{
+       struct acpi_iort_smmu *smmu;
+
+       /* Retrieve SMMU specific data */
+       smmu = (struct acpi_iort_smmu *)node->node_data;
+
+       /*
+        * Only consider the global fault interrupt and ignore the
+        * configuration access interrupt.
+        *
+        * MMIO address and global fault interrupt resources are always
+        * present so add them to the context interrupt count as a static
+        * value.
+        */
+       return smmu->context_interrupt_count + 2;
+}
+
+static void __init arm_smmu_init_resources(struct resource *res,
+                                          struct acpi_iort_node *node)
+{
+       struct acpi_iort_smmu *smmu;
+       int i, hw_irq, trigger, num_res = 0;
+       u64 *ctx_irq, *glb_irq;
+
+       /* Retrieve SMMU specific data */
+       smmu = (struct acpi_iort_smmu *)node->node_data;
+
+       res[num_res].start = smmu->base_address;
+       res[num_res].end = smmu->base_address + smmu->span - 1;
+       res[num_res].flags = IORESOURCE_MEM;
+       num_res++;
+
+       glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
+       /* Global IRQs */
+       hw_irq = IORT_IRQ_MASK(glb_irq[0]);
+       trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);
+
+       acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
+                                    &res[num_res++]);
+
+       /* Context IRQs */
+       ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
+       for (i = 0; i < smmu->context_interrupt_count; i++) {
+               hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
+               trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);
+
+               acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
+                                      &res[num_res++]);
+       }
+}
+
+static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
+{
+       struct acpi_iort_smmu *smmu;
+
+       /* Retrieve SMMU specific data */
+       smmu = (struct acpi_iort_smmu *)node->node_data;
+
+       return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
+}
+
+struct iort_iommu_config {
+       const char *name;
+       int (*iommu_init)(struct acpi_iort_node *node);
+       bool (*iommu_is_coherent)(struct acpi_iort_node *node);
+       int (*iommu_count_resources)(struct acpi_iort_node *node);
+       void (*iommu_init_resources)(struct resource *res,
+                                    struct acpi_iort_node *node);
+};
+
+static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
+       .name = "arm-smmu-v3",
+       .iommu_is_coherent = arm_smmu_v3_is_coherent,
+       .iommu_count_resources = arm_smmu_v3_count_resources,
+       .iommu_init_resources = arm_smmu_v3_init_resources
+};
+
+static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
+       .name = "arm-smmu",
+       .iommu_is_coherent = arm_smmu_is_coherent,
+       .iommu_count_resources = arm_smmu_count_resources,
+       .iommu_init_resources = arm_smmu_init_resources
+};
+
+static __init
+const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
+{
+       switch (node->type) {
+       case ACPI_IORT_NODE_SMMU_V3:
+               return &iort_arm_smmu_v3_cfg;
+       case ACPI_IORT_NODE_SMMU:
+               return &iort_arm_smmu_cfg;
+       default:
+               return NULL;
+       }
+}
+
+/**
+ * iort_add_smmu_platform_device() - Allocate a platform device for SMMU
+ * @node: Pointer to SMMU ACPI IORT node
+ *
+ * Returns: 0 on success, <0 failure
+ */
+static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
+{
+       struct fwnode_handle *fwnode;
+       struct platform_device *pdev;
+       struct resource *r;
+       enum dev_dma_attr attr;
+       int ret, count;
+       const struct iort_iommu_config *ops = iort_get_iommu_cfg(node);
+
+       if (!ops)
+               return -ENODEV;
+
+       pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
+       if (!pdev)
+               return -ENOMEM;
+
+       count = ops->iommu_count_resources(node);
+
+       r = kcalloc(count, sizeof(*r), GFP_KERNEL);
+       if (!r) {
+               ret = -ENOMEM;
+               goto dev_put;
+       }
+
+       ops->iommu_init_resources(r, node);
+
+       ret = platform_device_add_resources(pdev, r, count);
+       /*
+        * Resources are duplicated in platform_device_add_resources,
+        * free their allocated memory
+        */
+       kfree(r);
+
+       if (ret)
+               goto dev_put;
+
+       /*
+        * Add a copy of IORT node pointer to platform_data to
+        * be used to retrieve IORT data information.
+        */
+       ret = platform_device_add_data(pdev, &node, sizeof(node));
+       if (ret)
+               goto dev_put;
+
+       /*
+        * We expect the dma masks to be equivalent for
+        * all SMMUs set-ups
+        */
+       pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+
+       fwnode = iort_get_fwnode(node);
+
+       if (!fwnode) {
+               ret = -ENODEV;
+               goto dev_put;
+       }
+
+       pdev->dev.fwnode = fwnode;
+
+       attr = ops->iommu_is_coherent(node) ?
+                            DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
+
+       /* Configure DMA for the page table walker */
+       acpi_dma_configure(&pdev->dev, attr);
+
+       ret = platform_device_add(pdev);
+       if (ret)
+               goto dma_deconfigure;
+
+       return 0;
+
+dma_deconfigure:
+       acpi_dma_deconfigure(&pdev->dev);
+dev_put:
+       platform_device_put(pdev);
+
+       return ret;
+}
+
+static void __init iort_init_platform_devices(void)
+{
+       struct acpi_iort_node *iort_node, *iort_end;
+       struct acpi_table_iort *iort;
+       struct fwnode_handle *fwnode;
+       int i, ret;
+
+       /*
+        * iort_table and iort both point to the start of IORT table, but
+        * have different struct types
+        */
+       iort = (struct acpi_table_iort *)iort_table;
+
+       /* Get the first IORT node */
+       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 (iort_node >= iort_end) {
+                       pr_err("iort node pointer overflows, bad table\n");
+                       return;
+               }
+
+               if ((iort_node->type == ACPI_IORT_NODE_SMMU) ||
+                       (iort_node->type == ACPI_IORT_NODE_SMMU_V3)) {
+
+                       fwnode = acpi_alloc_fwnode_static();
+                       if (!fwnode)
+                               return;
+
+                       iort_set_fwnode(iort_node, fwnode);
+
+                       ret = iort_add_smmu_platform_device(iort_node);
+                       if (ret) {
+                               iort_delete_fwnode(iort_node);
+                               acpi_free_fwnode_static(fwnode);
+                               return;
+                       }
+               }
+
+               iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node,
+                                        iort_node->length);
+       }
+}
+
+void __init acpi_iort_init(void)
+{
+       acpi_status status;
+
+       status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
+       if (ACPI_FAILURE(status)) {
+               if (status != AE_NOT_FOUND) {
+                       const char *msg = acpi_format_exception(status);
+
+                       pr_err("Failed to get table, %s\n", msg);
+               }
+
+               return;
+       }
+
+       iort_init_platform_devices();
+
+       acpi_probe_device_table(iort);
+}
diff --git a/xen/include/acpi/acpi_iort.h b/xen/include/acpi/acpi_iort.h
new file mode 100644
index 0000000..77e0809
--- /dev/null
+++ b/xen/include/acpi/acpi_iort.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2016, Semihalf
+ *     Author: Tomasz Nowicki <tn@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef __ACPI_IORT_H__
+#define __ACPI_IORT_H__
+
+#include <linux/acpi.h>
+#include <linux/fwnode.h>
+#include <linux/irqdomain.h>
+
+#define IORT_IRQ_MASK(irq)             (irq & 0xffffffffULL)
+#define IORT_IRQ_TRIGGER_MASK(irq)     ((irq >> 32) & 0xffffffffULL)
+
+int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node);
+void iort_deregister_domain_token(int trans_id);
+struct fwnode_handle *iort_find_domain_token(int trans_id);
+#ifdef CONFIG_ACPI_IORT
+void acpi_iort_init(void);
+bool iort_node_match(u8 type);
+u32 iort_msi_map_rid(struct device *dev, u32 req_id);
+struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
+/* IOMMU interface */
+void iort_set_dma_mask(struct device *dev);
+const struct iommu_ops *iort_iommu_configure(struct device *dev);
+#else
+static inline void acpi_iort_init(void) { }
+static inline bool iort_node_match(u8 type) { return false; }
+static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
+{ return req_id; }
+static inline struct irq_domain *iort_get_device_domain(struct device *dev,
+                                                       u32 req_id)
+{ return NULL; }
+/* IOMMU interface */
+static inline void iort_set_dma_mask(struct device *dev) { }
+static inline
+const struct iommu_ops *iort_iommu_configure(struct device *dev)
+{ return NULL; }
+#endif
+
+#define IORT_ACPI_DECLARE(name, table_id, fn)          \
+       ACPI_DECLARE_PROBE_ENTRY(iort, name, table_id, 0, NULL, 0, fn)
+
+#endif /* __ACPI_IORT_H__ */
-- 
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. 
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux 
Foundation Collaborative Project.


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