// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2012, The Linux Foundation. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "coresight-priv.h" /* * Add an entry to the connection list and assign @conn's contents to it. * * If the output port is already assigned on this device, return -EINVAL */ struct coresight_connection * coresight_add_out_conn(struct device *dev, struct coresight_platform_data *pdata, const struct coresight_connection *new_conn) { int i; struct coresight_connection *conn; /* * Warn on any existing duplicate output port. */ for (i = 0; i < pdata->nr_outconns; ++i) { conn = pdata->out_conns[i]; /* Output == -1 means ignore the port for example for helpers */ if (conn->src_port != -1 && conn->src_port == new_conn->src_port) { dev_warn(dev, "Duplicate output port %d\n", conn->src_port); return ERR_PTR(-EINVAL); } } pdata->nr_outconns++; pdata->out_conns = devm_krealloc_array(dev, pdata->out_conns, pdata->nr_outconns, sizeof(*pdata->out_conns), GFP_KERNEL); if (!pdata->out_conns) return ERR_PTR(-ENOMEM); conn = devm_kmalloc(dev, sizeof(struct coresight_connection), GFP_KERNEL); if (!conn) return ERR_PTR(-ENOMEM); /* * Copy the new connection into the allocation, save the pointer to the * end of the connection array and also return it in case it needs to be * used right away. */ *conn = *new_conn; pdata->out_conns[pdata->nr_outconns - 1] = conn; return conn; } EXPORT_SYMBOL_GPL(coresight_add_out_conn); /* * Add an input connection reference to @out_conn in the target's in_conns array * * @out_conn: Existing output connection to store as an input on the * connection's remote device. */ int coresight_add_in_conn(struct coresight_connection *out_conn) { int i; struct device *dev = out_conn->dest_dev->dev.parent; struct coresight_platform_data *pdata = out_conn->dest_dev->pdata; for (i = 0; i < pdata->nr_inconns; ++i) if (!pdata->in_conns[i]) { pdata->in_conns[i] = out_conn; return 0; } pdata->nr_inconns++; pdata->in_conns = devm_krealloc_array(dev, pdata->in_conns, pdata->nr_inconns, sizeof(*pdata->in_conns), GFP_KERNEL); if (!pdata->in_conns) return -ENOMEM; pdata->in_conns[pdata->nr_inconns - 1] = out_conn; return 0; } EXPORT_SYMBOL_GPL(coresight_add_in_conn); 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 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_output_ports_node(const struct device_node *node) { return of_get_child_by_name(node, "out-ports"); } 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 @pdata->out_conns * * 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 = {}; struct coresight_connection *new_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.src_port = 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.dest_fwnode = fwnode_handle_get(rdev_fwnode); conn.dest_port = rendpoint.port; new_conn = coresight_add_out_conn(dev, pdata, &conn); if (IS_ERR_VALUE(new_conn)) { fwnode_handle_put(conn.dest_fwnode); return PTR_ERR(new_conn); } /* 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; 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) { /* * Avoid warnings in of_graph_get_next_endpoint() * if the device doesn't have any graph connections */ if (!of_graph_is_present(node)) return 0; 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 #include /* 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", } * }, * * 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, struct acpi_buffer *buf) { int i; 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, struct acpi_buffer *buf) { const union acpi_object *graph_list, *graph; int i, nr_graphs; graph_list = acpi_get_dsd_graph(adev, buf); 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->src_port = fields[0].integer.value; conn->dest_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->dest_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->dest_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 device *dev, struct acpi_device *adev, struct coresight_platform_data *pdata) { int ret = 0; int i, nlinks; const union acpi_object *graph; struct coresight_connection conn, zero_conn = {}; struct coresight_connection *new_conn; struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; graph = acpi_get_coresight_graph(adev, &buf); /* * There are no graph connections, which is fine for some components. * e.g., ETE */ if (!graph) goto free; nlinks = graph->package.elements[2].integer.value; if (!nlinks) goto free; for (i = 0; i < nlinks; i++) { const union acpi_object *link = &graph->package.elements[3 + i]; int dir; conn = zero_conn; dir = acpi_coresight_parse_link(adev, link, &conn); if (dir < 0) { ret = dir; goto free; } if (dir == ACPI_CORESIGHT_LINK_MASTER) { new_conn = coresight_add_out_conn(dev, pdata, &conn); if (IS_ERR(new_conn)) { ret = PTR_ERR(new_conn); goto free; } } } free: /* * When ACPI fails to alloc a buffer, it will free the buffer * created via ACPI_ALLOCATE_BUFFER and set to NULL. * ACPI_FREE can handle NULL pointers, so free it directly. */ ACPI_FREE(buf.pointer); return ret; } /* * 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(dev, 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, dev, pdata); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(coresight_get_platform_data);