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 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2012, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/acpi.h>
 #include <linux/types.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_graph.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/amba/bus.h>
 #include <linux/coresight.h>
 #include <linux/cpumask.h>
 #include <asm/smp_plat.h>
 
 #include "coresight-priv.h"
 /*
  * coresight_alloc_conns: Allocate connections record for each output
  * port from the device.
  */
 static int coresight_alloc_conns(struct device *dev,
                  struct coresight_platform_data *pdata)
 {
     if (pdata->nr_outport) {
         pdata->conns = devm_kcalloc(dev, pdata->nr_outport,
                         sizeof(*pdata->conns), GFP_KERNEL);
         if (!pdata->conns)
             return -ENOMEM;
     }
 
     return 0;
 }
 
 static struct device *
 coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
 {
     struct device *dev = NULL;
 
     /*
      * If we have a non-configurable replicator, it will be found on the
      * platform bus.
      */
     dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
     if (dev)
         return dev;
 
     /*
      * We have a configurable component - circle through the AMBA bus
      * looking for the device that matches the endpoint node.
      */
     return bus_find_device_by_fwnode(&amba_bustype, fwnode);
 }
 
 /*
  * Find a registered coresight device from a device fwnode.
  * The node info is associated with the AMBA parent, but the
  * csdev keeps a copy so iterate round the coresight bus to
  * find the device.
  */
 struct coresight_device *
 coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode)
 {
     struct device *dev;
     struct coresight_device *csdev = NULL;
 
     dev = bus_find_device_by_fwnode(&coresight_bustype, r_fwnode);
     if (dev) {
         csdev = to_coresight_device(dev);
         put_device(dev);
     }
     return csdev;
 }
 EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
 
 #ifdef CONFIG_OF
 static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
 {
     return of_property_read_bool(ep, "slave-mode");
 }
 
 static void of_coresight_get_ports_legacy(const struct device_node *node,
                       int *nr_inport, int *nr_outport)
 {
     struct device_node *ep = NULL;
     struct of_endpoint endpoint;
     int in = 0, out = 0;
 
     /*
      * Avoid warnings in of_graph_get_next_endpoint()
      * if the device doesn't have any graph connections
      */
     if (!of_graph_is_present(node))
         return;
     do {
         ep = of_graph_get_next_endpoint(node, ep);
         if (!ep)
             break;
 
         if (of_graph_parse_endpoint(ep, &endpoint))
             continue;
 
         if (of_coresight_legacy_ep_is_input(ep)) {
             in = (endpoint.port + 1 > in) ?
                 endpoint.port + 1 : in;
         } else {
             out = (endpoint.port + 1) > out ?
                 endpoint.port + 1 : out;
         }
 
     } while (ep);
 
     *nr_inport = in;
     *nr_outport = out;
 }
 
 static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
 {
     struct device_node *parent = of_graph_get_port_parent(ep);
 
     /*
      * Skip one-level up to the real device node, if we
      * are using the new bindings.
      */
     if (of_node_name_eq(parent, "in-ports") ||
         of_node_name_eq(parent, "out-ports"))
         parent = of_get_next_parent(parent);
 
     return parent;
 }
 
 static inline struct device_node *
 of_coresight_get_input_ports_node(const struct device_node *node)
 {
     return of_get_child_by_name(node, "in-ports");
 }
 
 static inline struct device_node *
 of_coresight_get_output_ports_node(const struct device_node *node)
 {
     return of_get_child_by_name(node, "out-ports");
 }
 
 static inline int
 of_coresight_count_ports(struct device_node *port_parent)
 {
     int i = 0;
     struct device_node *ep = NULL;
     struct of_endpoint endpoint;
 
     while ((ep = of_graph_get_next_endpoint(port_parent, ep))) {
         /* Defer error handling to parsing */
         if (of_graph_parse_endpoint(ep, &endpoint))
             continue;
         if (endpoint.port + 1 > i)
             i = endpoint.port + 1;
     }
 
     return i;
 }
 
 static void of_coresight_get_ports(const struct device_node *node,
                    int *nr_inport, int *nr_outport)
 {
     struct device_node *input_ports = NULL, *output_ports = NULL;
 
     input_ports = of_coresight_get_input_ports_node(node);
     output_ports = of_coresight_get_output_ports_node(node);
 
     if (input_ports || output_ports) {
         if (input_ports) {
             *nr_inport = of_coresight_count_ports(input_ports);
             of_node_put(input_ports);
         }
         if (output_ports) {
             *nr_outport = of_coresight_count_ports(output_ports);
             of_node_put(output_ports);
         }
     } else {
         /* Fall back to legacy DT bindings parsing */
         of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
     }
 }
 
 static int of_coresight_get_cpu(struct device *dev)
 {
     int cpu;
     struct device_node *dn;
 
     if (!dev->of_node)
         return -ENODEV;
 
     dn = of_parse_phandle(dev->of_node, "cpu", 0);
     if (!dn)
         return -ENODEV;
 
     cpu = of_cpu_node_to_id(dn);
     of_node_put(dn);
 
     return cpu;
 }
 
 /*
  * of_coresight_parse_endpoint : Parse the given output endpoint @ep
  * and fill the connection information in @conn
  *
  * Parses the local port, remote device name and the remote port.
  *
  * Returns :
  *   0  - If the parsing completed without any fatal errors.
  *  -Errno  - Fatal error, abort the scanning.
  */
 static int of_coresight_parse_endpoint(struct device *dev,
                        struct device_node *ep,
                        struct coresight_platform_data *pdata)
 {
     int ret = 0;
     struct of_endpoint endpoint, rendpoint;
     struct device_node *rparent = NULL;
     struct device_node *rep = NULL;
     struct device *rdev = NULL;
     struct fwnode_handle *rdev_fwnode;
     struct coresight_connection *conn;
 
     do {
         /* Parse the local port details */
         if (of_graph_parse_endpoint(ep, &endpoint))
             break;
         /*
          * Get a handle on the remote endpoint and the device it is
          * attached to.
          */
         rep = of_graph_get_remote_endpoint(ep);
         if (!rep)
             break;
         rparent = of_coresight_get_port_parent(rep);
         if (!rparent)
             break;
         if (of_graph_parse_endpoint(rep, &rendpoint))
             break;
 
         rdev_fwnode = of_fwnode_handle(rparent);
         /* If the remote device is not available, defer probing */
         rdev = coresight_find_device_by_fwnode(rdev_fwnode);
         if (!rdev) {
             ret = -EPROBE_DEFER;
             break;
         }
 
         conn = &pdata->conns[endpoint.port];
         if (conn->child_fwnode) {
             dev_warn(dev, "Duplicate output port %d\n",
                  endpoint.port);
             ret = -EINVAL;
             break;
         }
         conn->outport = endpoint.port;
         /*
          * Hold the refcount to the target device. This could be
          * released via:
          * 1) coresight_release_platform_data() if the probe fails or
          *    this device is unregistered.
          * 2) While removing the target device via
          *    coresight_remove_match()
          */
         conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
         conn->child_port = rendpoint.port;
         /* Connection record updated */
     } while (0);
 
     of_node_put(rparent);
     of_node_put(rep);
     put_device(rdev);
 
     return ret;
 }
 
 static int of_get_coresight_platform_data(struct device *dev,
                       struct coresight_platform_data *pdata)
 {
     int ret = 0;
     struct device_node *ep = NULL;
     const struct device_node *parent = NULL;
     bool legacy_binding = false;
     struct device_node *node = dev->of_node;
 
     /* Get the number of input and output port for this component */
     of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
 
     /* If there are no output connections, we are done */
     if (!pdata->nr_outport)
         return 0;
 
     ret = coresight_alloc_conns(dev, pdata);
     if (ret)
         return ret;
 
     parent = of_coresight_get_output_ports_node(node);
     /*
      * If the DT uses obsoleted bindings, the ports are listed
      * under the device and we need to filter out the input
      * ports.
      */
     if (!parent) {
         legacy_binding = true;
         parent = node;
         dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
     }
 
     /* Iterate through each output port to discover topology */
     while ((ep = of_graph_get_next_endpoint(parent, ep))) {
         /*
          * Legacy binding mixes input/output ports under the
          * same parent. So, skip the input ports if we are dealing
          * with legacy binding, as they processed with their
          * connected output ports.
          */
         if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
             continue;
 
         ret = of_coresight_parse_endpoint(dev, ep, pdata);
         if (ret)
             return ret;
     }
 
     return 0;
 }
 #else
 static inline int
 of_get_coresight_platform_data(struct device *dev,
                    struct coresight_platform_data *pdata)
 {
     return -ENOENT;
 }
 
 static inline int of_coresight_get_cpu(struct device *dev)
 {
     return -ENODEV;
 }
 #endif
 
 #ifdef CONFIG_ACPI
 
 #include <acpi/actypes.h>
 #include <acpi/processor.h>
 
 /* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
 static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
                         0xbd, 0x68, 0xf7, 0xd3,
                         0x44, 0xef, 0x21, 0x53);
 /* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
 static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
                              0x81, 0x07, 0xe6, 0x27,
                              0xf8, 0x05, 0xc6, 0xcd);
 #define ACPI_CORESIGHT_LINK_SLAVE   0
 #define ACPI_CORESIGHT_LINK_MASTER  1
 
 static inline bool is_acpi_guid(const union acpi_object *obj)
 {
     return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
 }
 
 /*
  * acpi_guid_matches    - Checks if the given object is a GUID object and
  * that it matches the supplied the GUID.
  */
 static inline bool acpi_guid_matches(const union acpi_object *obj,
                    const guid_t *guid)
 {
     return is_acpi_guid(obj) &&
            guid_equal((guid_t *)obj->buffer.pointer, guid);
 }
 
 static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
 {
     return acpi_guid_matches(obj, &acpi_graph_uuid);
 }
 
 static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
 {
     return acpi_guid_matches(obj, &coresight_graph_uuid);
 }
 
 static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
 {
     const union acpi_object *graphid, *guid, *links;
 
     if (obj->type != ACPI_TYPE_PACKAGE ||
         obj->package.count < 3)
         return false;
 
     graphid = &obj->package.elements[0];
     guid = &obj->package.elements[1];
     links = &obj->package.elements[2];
 
     if (graphid->type != ACPI_TYPE_INTEGER ||
         links->type != ACPI_TYPE_INTEGER)
         return false;
 
     return is_acpi_coresight_graph_guid(guid);
 }
 
 /*
  * acpi_validate_dsd_graph  - Make sure the given _DSD graph conforms
  * to the ACPI _DSD Graph specification.
  *
  * ACPI Devices Graph property has the following format:
  *  {
  *  Revision    - Integer, must be 0
  *  NumberOfGraphs  - Integer, N indicating the following list.
  *  Graph[1],
  *   ...
  *  Graph[N]
  *  }
  *
  * And each Graph entry has the following format:
  *  {
  *  GraphID     - Integer, identifying a graph the device belongs to.
  *  UUID        - UUID identifying the specification that governs
  *            this graph. (e.g, see is_acpi_coresight_graph())
  *  NumberOfLinks   - Number "N" of connections on this node of the graph.
  *  Links[1]
  *  ...
  *  Links[N]
  *  }
  *
  * Where each "Links" entry has the following format:
  *
  * {
  *  SourcePortAddress   - Integer
  *  DestinationPortAddress  - Integer
  *  DestinationDeviceName   - Reference to another device
  *  ( --- CoreSight specific extensions below ---)
  *  DirectionOfFlow     - Integer 1 for output(master)
  *                0 for input(slave)
  * }
  *
  * e.g:
  * For a Funnel device
  *
  * Device(MFUN) {
  *   ...
  *
  *   Name (_DSD, Package() {
  *  // DSD Package contains tuples of {  Proeprty_Type_UUID, Package() }
  *  ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
  *  Package() {
  *      Package(2) { "property-name", <property-value> }
  *  },
  *
  *  ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
  *  Package() {
  *    0,        // Revision
  *    1,        // NumberOfGraphs.
  *    Package() {   // Graph[0] Package
  *       1,     // GraphID
  *       // Coresight Graph UUID
  *       ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
  *       3,     // NumberOfLinks aka ports
  *       // Link[0]: Output_0 -> Replicator:Input_0
  *       Package () { 0, 0, \_SB_.RPL0, 1 },
  *       // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
  *       Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
  *       // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
  *        Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
  *    } // End of Graph[0] Package
  *
  *  }, // End of ACPI Graph Property
  *  })
  */
 static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
 {
     int i, n;
     const union acpi_object *rev, *nr_graphs;
 
     /* The graph must contain at least the Revision and Number of Graphs */
     if (graph->package.count < 2)
         return false;
 
     rev = &graph->package.elements[0];
     nr_graphs = &graph->package.elements[1];
 
     if (rev->type != ACPI_TYPE_INTEGER ||
         nr_graphs->type != ACPI_TYPE_INTEGER)
         return false;
 
     /* We only support revision 0 */
     if (rev->integer.value != 0)
         return false;
 
     n = nr_graphs->integer.value;
     /* CoreSight devices are only part of a single Graph */
     if (n != 1)
         return false;
 
     /* Make sure the ACPI graph package has right number of elements */
     if (graph->package.count != (n + 2))
         return false;
 
     /*
      * Each entry must be a graph package with at least 3 members :
      * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
      */
     for (i = 2; i < n + 2; i++) {
         const union acpi_object *obj = &graph->package.elements[i];
 
         if (obj->type != ACPI_TYPE_PACKAGE ||
             obj->package.count < 3)
             return false;
     }
 
     return true;
 }
 
 /* acpi_get_dsd_graph   - Find the _DSD Graph property for the given device. */
 static const union acpi_object *
 acpi_get_dsd_graph(struct acpi_device *adev)
 {
     int i;
     struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
     acpi_status status;
     const union acpi_object *dsd;
 
     status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
                         &buf, ACPI_TYPE_PACKAGE);
     if (ACPI_FAILURE(status))
         return NULL;
 
     dsd = buf.pointer;
 
     /*
      * _DSD property consists tuples { Prop_UUID, Package() }
      * Iterate through all the packages and find the Graph.
      */
     for (i = 0; i + 1 < dsd->package.count; i += 2) {
         const union acpi_object *guid, *package;
 
         guid = &dsd->package.elements[i];
         package = &dsd->package.elements[i + 1];
 
         /* All _DSD elements must have a UUID and a Package */
         if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
             break;
         /* Skip the non-Graph _DSD packages */
         if (!is_acpi_dsd_graph_guid(guid))
             continue;
         if (acpi_validate_dsd_graph(package))
             return package;
         /* Invalid graph format, continue */
         dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
     }
 
     return NULL;
 }
 
 static inline bool
 acpi_validate_coresight_graph(const union acpi_object *cs_graph)
 {
     int nlinks;
 
     nlinks = cs_graph->package.elements[2].integer.value;
     /*
      * Graph must have the following fields :
      * { GraphID, GraphUUID, NumberOfLinks, Links... }
      */
     if (cs_graph->package.count != (nlinks + 3))
         return false;
     /* The links are validated in acpi_coresight_parse_link() */
     return true;
 }
 
 /*
  * acpi_get_coresight_graph - Parse the device _DSD tables and find
  * the Graph property matching the CoreSight Graphs.
  *
  * Returns the pointer to the CoreSight Graph Package when found. Otherwise
  * returns NULL.
  */
 static const union acpi_object *
 acpi_get_coresight_graph(struct acpi_device *adev)
 {
     const union acpi_object *graph_list, *graph;
     int i, nr_graphs;
 
     graph_list = acpi_get_dsd_graph(adev);
     if (!graph_list)
         return graph_list;
 
     nr_graphs = graph_list->package.elements[1].integer.value;
 
     for (i = 2; i < nr_graphs + 2; i++) {
         graph = &graph_list->package.elements[i];
         if (!is_acpi_coresight_graph(graph))
             continue;
         if (acpi_validate_coresight_graph(graph))
             return graph;
         /* Invalid graph format */
         break;
     }
 
     return NULL;
 }
 
 /*
  * acpi_coresight_parse_link    - Parse the given Graph connection
  * of the device and populate the coresight_connection for an output
  * connection.
  *
  * CoreSight Graph specification mandates that the direction of the data
  * flow must be specified in the link. i.e,
  *
  *  SourcePortAddress,  // Integer
  *  DestinationPortAddress, // Integer
  *  DestinationDeviceName,  // Reference to another device
  *  DirectionOfFlow,    // 1 for output(master), 0 for input(slave)
  *
  * Returns the direction of the data flow [ Input(slave) or Output(master) ]
  * upon success.
  * Returns an negative error number otherwise.
  */
 static int acpi_coresight_parse_link(struct acpi_device *adev,
                      const union acpi_object *link,
                      struct coresight_connection *conn)
 {
     int dir;
     const union acpi_object *fields;
     struct acpi_device *r_adev;
     struct device *rdev;
 
     if (link->type != ACPI_TYPE_PACKAGE ||
         link->package.count != 4)
         return -EINVAL;
 
     fields = link->package.elements;
 
     if (fields[0].type != ACPI_TYPE_INTEGER ||
         fields[1].type != ACPI_TYPE_INTEGER ||
         fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
         fields[3].type != ACPI_TYPE_INTEGER)
         return -EINVAL;
 
     r_adev = acpi_fetch_acpi_dev(fields[2].reference.handle);
     if (!r_adev)
         return -ENODEV;
 
     dir = fields[3].integer.value;
     if (dir == ACPI_CORESIGHT_LINK_MASTER) {
         conn->outport = fields[0].integer.value;
         conn->child_port = fields[1].integer.value;
         rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
         if (!rdev)
             return -EPROBE_DEFER;
         /*
          * Hold the refcount to the target device. This could be
          * released via:
          * 1) coresight_release_platform_data() if the probe fails or
          *    this device is unregistered.
          * 2) While removing the target device via
          *    coresight_remove_match().
          */
         conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
     } else if (dir == ACPI_CORESIGHT_LINK_SLAVE) {
         /*
          * We are only interested in the port number
          * for the input ports at this component.
          * Store the port number in child_port.
          */
         conn->child_port = fields[0].integer.value;
     } else {
         /* Invalid direction */
         return -EINVAL;
     }
 
     return dir;
 }
 
 /*
  * acpi_coresight_parse_graph   - Parse the _DSD CoreSight graph
  * connection information and populate the supplied coresight_platform_data
  * instance.
  */
 static int acpi_coresight_parse_graph(struct acpi_device *adev,
                       struct coresight_platform_data *pdata)
 {
     int rc, i, nlinks;
     const union acpi_object *graph;
     struct coresight_connection *conns, *ptr;
 
     pdata->nr_inport = pdata->nr_outport = 0;
     graph = acpi_get_coresight_graph(adev);
     if (!graph)
         return -ENOENT;
 
     nlinks = graph->package.elements[2].integer.value;
     if (!nlinks)
         return 0;
 
     /*
      * To avoid scanning the table twice (once for finding the number of
      * output links and then later for parsing the output links),
      * cache the links information in one go and then later copy
      * it to the pdata.
      */
     conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
     if (!conns)
         return -ENOMEM;
     ptr = conns;
     for (i = 0; i < nlinks; i++) {
         const union acpi_object *link = &graph->package.elements[3 + i];
         int dir;
 
         dir = acpi_coresight_parse_link(adev, link, ptr);
         if (dir < 0)
             return dir;
 
         if (dir == ACPI_CORESIGHT_LINK_MASTER) {
             if (ptr->outport >= pdata->nr_outport)
                 pdata->nr_outport = ptr->outport + 1;
             ptr++;
         } else {
             WARN_ON(pdata->nr_inport == ptr->child_port + 1);
             /*
              * We do not track input port connections for a device.
              * However we need the highest port number described,
              * which can be recorded now and reuse this connection
              * record for an output connection. Hence, do not move
              * the ptr for input connections
              */
             if (ptr->child_port >= pdata->nr_inport)
                 pdata->nr_inport = ptr->child_port + 1;
         }
     }
 
     rc = coresight_alloc_conns(&adev->dev, pdata);
     if (rc)
         return rc;
 
     /* Copy the connection information to the final location */
     for (i = 0; conns + i < ptr; i++) {
         int port = conns[i].outport;
 
         /* Duplicate output port */
         WARN_ON(pdata->conns[port].child_fwnode);
         pdata->conns[port] = conns[i];
     }
 
     devm_kfree(&adev->dev, conns);
     return 0;
 }
 
 /*
  * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
  * logical CPU id of the corresponding CPU device.
  *
  * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
  */
 static int
 acpi_handle_to_logical_cpuid(acpi_handle handle)
 {
     int i;
     struct acpi_processor *pr;
 
     for_each_possible_cpu(i) {
         pr = per_cpu(processors, i);
         if (pr && pr->handle == handle)
             break;
     }
 
     return i;
 }
 
 /*
  * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
  * with this coresight device. With ACPI bindings, the CoreSight components
  * are listed as child device of the associated CPU.
  *
  * Returns the logical CPU id when found. Otherwise returns 0.
  */
 static int acpi_coresight_get_cpu(struct device *dev)
 {
     int cpu;
     acpi_handle cpu_handle;
     acpi_status status;
     struct acpi_device *adev = ACPI_COMPANION(dev);
 
     if (!adev)
         return -ENODEV;
     status = acpi_get_parent(adev->handle, &cpu_handle);
     if (ACPI_FAILURE(status))
         return -ENODEV;
 
     cpu = acpi_handle_to_logical_cpuid(cpu_handle);
     if (cpu >= nr_cpu_ids)
         return -ENODEV;
     return cpu;
 }
 
 static int
 acpi_get_coresight_platform_data(struct device *dev,
                  struct coresight_platform_data *pdata)
 {
     struct acpi_device *adev;
 
     adev = ACPI_COMPANION(dev);
     if (!adev)
         return -EINVAL;
 
     return acpi_coresight_parse_graph(adev, pdata);
 }
 
 #else
 
 static inline int
 acpi_get_coresight_platform_data(struct device *dev,
                  struct coresight_platform_data *pdata)
 {
     return -ENOENT;
 }
 
 static inline int acpi_coresight_get_cpu(struct device *dev)
 {
     return -ENODEV;
 }
 #endif
 
 int coresight_get_cpu(struct device *dev)
 {
     if (is_of_node(dev->fwnode))
         return of_coresight_get_cpu(dev);
     else if (is_acpi_device_node(dev->fwnode))
         return acpi_coresight_get_cpu(dev);
     return 0;
 }
 EXPORT_SYMBOL_GPL(coresight_get_cpu);
 
 struct coresight_platform_data *
 coresight_get_platform_data(struct device *dev)
 {
     int ret = -ENOENT;
     struct coresight_platform_data *pdata = NULL;
     struct fwnode_handle *fwnode = dev_fwnode(dev);
 
     if (IS_ERR_OR_NULL(fwnode))
         goto error;
 
     pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
     if (!pdata) {
         ret = -ENOMEM;
         goto error;
     }
 
     if (is_of_node(fwnode))
         ret = of_get_coresight_platform_data(dev, pdata);
     else if (is_acpi_device_node(fwnode))
         ret = acpi_get_coresight_platform_data(dev, pdata);
 
     if (!ret)
         return pdata;
 error:
     if (!IS_ERR_OR_NULL(pdata))
         /* Cleanup the connection information */
         coresight_release_platform_data(NULL, pdata);
     return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(coresight_get_platform_data);

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