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coresight: Support for ACPI bindings
Add support for parsing the ACPI platform description for CoreSight. The connections are encoded in a DSD graph property with CoreSight specific variation of the property. The ETMs are listed as the children device of the respective CPU. Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose
Greg Kroah-Hartman
parent
68c0dacb88
commit
76ffa5ab5b
1 changed files with 464 additions and 0 deletions
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@ -3,6 +3,7 @@
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* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*/
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#include <linux/acpi.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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@ -308,10 +309,471 @@ of_get_coresight_platform_data(struct device *dev,
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}
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#endif
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#ifdef CONFIG_ACPI
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#include <acpi/actypes.h>
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#include <acpi/processor.h>
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/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
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static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
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0xbd, 0x68, 0xf7, 0xd3,
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0x44, 0xef, 0x21, 0x53);
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/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
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static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
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0x81, 0x07, 0xe6, 0x27,
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0xf8, 0x05, 0xc6, 0xcd);
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#define ACPI_CORESIGHT_LINK_SLAVE 0
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#define ACPI_CORESIGHT_LINK_MASTER 1
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static inline bool is_acpi_guid(const union acpi_object *obj)
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{
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return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
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}
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/*
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* acpi_guid_matches - Checks if the given object is a GUID object and
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* that it matches the supplied the GUID.
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*/
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static inline bool acpi_guid_matches(const union acpi_object *obj,
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const guid_t *guid)
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{
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return is_acpi_guid(obj) &&
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guid_equal((guid_t *)obj->buffer.pointer, guid);
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}
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static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
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{
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return acpi_guid_matches(obj, &acpi_graph_uuid);
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}
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static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
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{
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return acpi_guid_matches(obj, &coresight_graph_uuid);
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}
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static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
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{
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const union acpi_object *graphid, *guid, *links;
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if (obj->type != ACPI_TYPE_PACKAGE ||
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obj->package.count < 3)
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return false;
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graphid = &obj->package.elements[0];
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guid = &obj->package.elements[1];
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links = &obj->package.elements[2];
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if (graphid->type != ACPI_TYPE_INTEGER ||
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links->type != ACPI_TYPE_INTEGER)
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return false;
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return is_acpi_coresight_graph_guid(guid);
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}
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/*
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* acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
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* to the ACPI _DSD Graph specification.
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*
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* ACPI Devices Graph property has the following format:
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* {
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* Revision - Integer, must be 0
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* NumberOfGraphs - Integer, N indicating the following list.
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* Graph[1],
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* ...
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* Graph[N]
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* }
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*
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* And each Graph entry has the following format:
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* {
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* GraphID - Integer, identifying a graph the device belongs to.
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* UUID - UUID identifying the specification that governs
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* this graph. (e.g, see is_acpi_coresight_graph())
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* NumberOfLinks - Number "N" of connections on this node of the graph.
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* Links[1]
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* ...
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* Links[N]
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* }
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*
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* Where each "Links" entry has the following format:
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*
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* {
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* SourcePortAddress - Integer
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* DestinationPortAddress - Integer
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* DestinationDeviceName - Reference to another device
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* ( --- CoreSight specific extensions below ---)
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* DirectionOfFlow - Integer 1 for output(master)
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* 0 for input(slave)
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* }
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*
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* e.g:
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* For a Funnel device
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*
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* Device(MFUN) {
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* ...
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*
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* Name (_DSD, Package() {
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* // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
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* ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
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* Package() {
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* Package(2) { "property-name", <property-value> }
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* },
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*
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* ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
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* Package() {
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* 0, // Revision
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* 1, // NumberOfGraphs.
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* Package() { // Graph[0] Package
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* 1, // GraphID
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* // Coresight Graph UUID
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* ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
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* 3, // NumberOfLinks aka ports
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* // Link[0]: Output_0 -> Replicator:Input_0
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* Package () { 0, 0, \_SB_.RPL0, 1 },
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* // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
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* Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
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* // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
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* Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
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* } // End of Graph[0] Package
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*
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* }, // End of ACPI Graph Property
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* })
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*/
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static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
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{
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int i, n;
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const union acpi_object *rev, *nr_graphs;
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/* The graph must contain at least the Revision and Number of Graphs */
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if (graph->package.count < 2)
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return false;
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rev = &graph->package.elements[0];
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nr_graphs = &graph->package.elements[1];
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if (rev->type != ACPI_TYPE_INTEGER ||
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nr_graphs->type != ACPI_TYPE_INTEGER)
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return false;
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/* We only support revision 0 */
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if (rev->integer.value != 0)
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return false;
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n = nr_graphs->integer.value;
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/* CoreSight devices are only part of a single Graph */
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if (n != 1)
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return false;
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/* Make sure the ACPI graph package has right number of elements */
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if (graph->package.count != (n + 2))
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return false;
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/*
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* Each entry must be a graph package with at least 3 members :
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* { GraphID, UUID, NumberOfLinks(n), Links[.],... }
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*/
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for (i = 2; i < n + 2; i++) {
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const union acpi_object *obj = &graph->package.elements[i];
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if (obj->type != ACPI_TYPE_PACKAGE ||
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obj->package.count < 3)
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return false;
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}
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return true;
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}
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/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
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const union acpi_object *
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acpi_get_dsd_graph(struct acpi_device *adev)
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{
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int i;
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struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
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acpi_status status;
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const union acpi_object *dsd;
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status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
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&buf, ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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return NULL;
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dsd = buf.pointer;
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/*
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* _DSD property consists tuples { Prop_UUID, Package() }
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* Iterate through all the packages and find the Graph.
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*/
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for (i = 0; i + 1 < dsd->package.count; i += 2) {
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const union acpi_object *guid, *package;
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guid = &dsd->package.elements[i];
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package = &dsd->package.elements[i + 1];
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/* All _DSD elements must have a UUID and a Package */
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if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
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break;
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/* Skip the non-Graph _DSD packages */
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if (!is_acpi_dsd_graph_guid(guid))
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continue;
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if (acpi_validate_dsd_graph(package))
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return package;
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/* Invalid graph format, continue */
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dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
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}
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return NULL;
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}
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static inline bool
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acpi_validate_coresight_graph(const union acpi_object *cs_graph)
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{
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int nlinks;
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nlinks = cs_graph->package.elements[2].integer.value;
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/*
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* Graph must have the following fields :
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* { GraphID, GraphUUID, NumberOfLinks, Links... }
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*/
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if (cs_graph->package.count != (nlinks + 3))
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return false;
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/* The links are validated in acpi_coresight_parse_link() */
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return true;
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}
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/*
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* acpi_get_coresight_graph - Parse the device _DSD tables and find
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* the Graph property matching the CoreSight Graphs.
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*
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* Returns the pointer to the CoreSight Graph Package when found. Otherwise
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* returns NULL.
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*/
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const union acpi_object *
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acpi_get_coresight_graph(struct acpi_device *adev)
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{
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const union acpi_object *graph_list, *graph;
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int i, nr_graphs;
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graph_list = acpi_get_dsd_graph(adev);
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if (!graph_list)
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return graph_list;
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nr_graphs = graph_list->package.elements[1].integer.value;
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for (i = 2; i < nr_graphs + 2; i++) {
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graph = &graph_list->package.elements[i];
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if (!is_acpi_coresight_graph(graph))
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continue;
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if (acpi_validate_coresight_graph(graph))
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return graph;
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/* Invalid graph format */
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break;
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}
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return NULL;
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}
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/*
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* acpi_coresight_parse_link - Parse the given Graph connection
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* of the device and populate the coresight_connection for an output
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* connection.
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*
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* CoreSight Graph specification mandates that the direction of the data
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* flow must be specified in the link. i.e,
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*
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* SourcePortAddress, // Integer
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* DestinationPortAddress, // Integer
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* DestinationDeviceName, // Reference to another device
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* DirectionOfFlow, // 1 for output(master), 0 for input(slave)
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*
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* Returns the direction of the data flow [ Input(slave) or Output(master) ]
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* upon success.
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* Returns an negative error number otherwise.
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*/
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static int acpi_coresight_parse_link(struct acpi_device *adev,
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const union acpi_object *link,
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struct coresight_connection *conn)
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{
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int rc, dir;
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const union acpi_object *fields;
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struct acpi_device *r_adev;
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struct device *rdev;
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if (link->type != ACPI_TYPE_PACKAGE ||
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link->package.count != 4)
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return -EINVAL;
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fields = link->package.elements;
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if (fields[0].type != ACPI_TYPE_INTEGER ||
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fields[1].type != ACPI_TYPE_INTEGER ||
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fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
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fields[3].type != ACPI_TYPE_INTEGER)
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return -EINVAL;
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rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev);
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if (rc)
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return rc;
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dir = fields[3].integer.value;
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if (dir == ACPI_CORESIGHT_LINK_MASTER) {
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conn->outport = fields[0].integer.value;
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conn->child_port = fields[1].integer.value;
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rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
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if (!rdev)
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return -EPROBE_DEFER;
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/*
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* Hold the refcount to the target device. This could be
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* released via:
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* 1) coresight_release_platform_data() if the probe fails or
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* this device is unregistered.
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* 2) While removing the target device via
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* coresight_remove_match().
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*/
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conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
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}
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return dir;
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}
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/*
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* acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
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* connection information and populate the supplied coresight_platform_data
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* instance.
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*/
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static int acpi_coresight_parse_graph(struct acpi_device *adev,
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struct coresight_platform_data *pdata)
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{
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int rc, i, nlinks;
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const union acpi_object *graph;
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struct coresight_connection *conns, *ptr;
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pdata->nr_inport = pdata->nr_outport = 0;
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graph = acpi_get_coresight_graph(adev);
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if (!graph)
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return -ENOENT;
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nlinks = graph->package.elements[2].integer.value;
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if (!nlinks)
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return 0;
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/*
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* To avoid scanning the table twice (once for finding the number of
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* output links and then later for parsing the output links),
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* cache the links information in one go and then later copy
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* it to the pdata.
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*/
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conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
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if (!conns)
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return -ENOMEM;
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ptr = conns;
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for (i = 0; i < nlinks; i++) {
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const union acpi_object *link = &graph->package.elements[3 + i];
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int dir;
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dir = acpi_coresight_parse_link(adev, link, ptr);
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if (dir < 0)
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return dir;
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if (dir == ACPI_CORESIGHT_LINK_MASTER) {
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pdata->nr_outport++;
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ptr++;
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} else {
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pdata->nr_inport++;
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}
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}
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rc = coresight_alloc_conns(&adev->dev, pdata);
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if (rc)
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return rc;
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/* Copy the connection information to the final location */
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for (i = 0; i < pdata->nr_outport; i++)
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pdata->conns[i] = conns[i];
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devm_kfree(&adev->dev, conns);
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return 0;
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}
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/*
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* acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
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* logical CPU id of the corresponding CPU device.
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*
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* Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
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*/
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static int
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acpi_handle_to_logical_cpuid(acpi_handle handle)
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{
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int i;
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struct acpi_processor *pr;
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for_each_possible_cpu(i) {
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pr = per_cpu(processors, i);
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if (pr && pr->handle == handle)
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break;
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}
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return i;
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}
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/*
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* acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
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* with this coresight device. With ACPI bindings, the CoreSight components
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* are listed as child device of the associated CPU.
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*
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* Returns the logical CPU id when found. Otherwise returns 0.
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*/
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static int acpi_coresight_get_cpu(struct device *dev)
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{
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int cpu;
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acpi_handle cpu_handle;
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acpi_status status;
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struct acpi_device *adev = ACPI_COMPANION(dev);
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if (!adev)
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return 0;
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status = acpi_get_parent(adev->handle, &cpu_handle);
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if (ACPI_FAILURE(status))
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return 0;
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cpu = acpi_handle_to_logical_cpuid(cpu_handle);
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if (cpu >= nr_cpu_ids)
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return 0;
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return cpu;
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}
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static int
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acpi_get_coresight_platform_data(struct device *dev,
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struct coresight_platform_data *pdata)
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{
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struct acpi_device *adev;
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adev = ACPI_COMPANION(dev);
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if (!adev)
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return -EINVAL;
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return acpi_coresight_parse_graph(adev, pdata);
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}
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#else
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static inline int
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acpi_get_coresight_platform_data(struct device *dev,
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struct coresight_platform_data *pdata)
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{
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return -ENOENT;
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}
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static inline int acpi_coresight_get_cpu(struct device *dev)
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{
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return 0;
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}
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#endif
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int coresight_get_cpu(struct device *dev)
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{
|
||||
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);
|
||||
|
|
@ -334,6 +796,8 @@ coresight_get_platform_data(struct device *dev)
|
|||
|
||||
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;
|
||||
|
|
|
|||
Loading…
Reference in a new issue