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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2012, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/acpi.h>
7#include <linux/types.h>
8#include <linux/err.h>
9#include <linux/slab.h>
10#include <linux/clk.h>
11#include <linux/of.h>
12#include <linux/of_graph.h>
13#include <linux/platform_device.h>
14#include <linux/amba/bus.h>
15#include <linux/coresight.h>
16#include <linux/cpumask.h>
17#include <asm/smp_plat.h>
18
19#include "coresight-priv.h"
20
21/*
22 * Add an entry to the connection list and assign @conn's contents to it.
23 *
24 * If the output port is already assigned on this device, return -EINVAL
25 */
26struct coresight_connection *
27coresight_add_out_conn(struct device *dev,
28 struct coresight_platform_data *pdata,
29 const struct coresight_connection *new_conn)
30{
31 int i;
32 struct coresight_connection *conn;
33
34 /*
35 * Warn on any existing duplicate output port.
36 */
37 for (i = 0; i < pdata->nr_outconns; ++i) {
38 conn = pdata->out_conns[i];
39 /* Output == -1 means ignore the port for example for helpers */
40 if (conn->src_port != -1 &&
41 conn->src_port == new_conn->src_port) {
42 dev_warn(dev, "Duplicate output port %d\n",
43 conn->src_port);
44 return ERR_PTR(-EINVAL);
45 }
46 }
47
48 pdata->nr_outconns++;
49 pdata->out_conns =
50 devm_krealloc_array(dev, pdata->out_conns, pdata->nr_outconns,
51 sizeof(*pdata->out_conns), GFP_KERNEL);
52 if (!pdata->out_conns)
53 return ERR_PTR(-ENOMEM);
54
55 conn = devm_kmalloc(dev, sizeof(struct coresight_connection),
56 GFP_KERNEL);
57 if (!conn)
58 return ERR_PTR(-ENOMEM);
59
60 /*
61 * Copy the new connection into the allocation, save the pointer to the
62 * end of the connection array and also return it in case it needs to be
63 * used right away.
64 */
65 *conn = *new_conn;
66 pdata->out_conns[pdata->nr_outconns - 1] = conn;
67 return conn;
68}
69EXPORT_SYMBOL_GPL(coresight_add_out_conn);
70
71/*
72 * Add an input connection reference to @out_conn in the target's in_conns array
73 *
74 * @out_conn: Existing output connection to store as an input on the
75 * connection's remote device.
76 */
77int coresight_add_in_conn(struct coresight_connection *out_conn)
78{
79 int i;
80 struct device *dev = out_conn->dest_dev->dev.parent;
81 struct coresight_platform_data *pdata = out_conn->dest_dev->pdata;
82
83 for (i = 0; i < pdata->nr_inconns; ++i)
84 if (!pdata->in_conns[i]) {
85 pdata->in_conns[i] = out_conn;
86 return 0;
87 }
88
89 pdata->nr_inconns++;
90 pdata->in_conns =
91 devm_krealloc_array(dev, pdata->in_conns, pdata->nr_inconns,
92 sizeof(*pdata->in_conns), GFP_KERNEL);
93 if (!pdata->in_conns)
94 return -ENOMEM;
95 pdata->in_conns[pdata->nr_inconns - 1] = out_conn;
96 return 0;
97}
98EXPORT_SYMBOL_GPL(coresight_add_in_conn);
99
100static struct device *
101coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
102{
103 struct device *dev = NULL;
104
105 /*
106 * If we have a non-configurable replicator, it will be found on the
107 * platform bus.
108 */
109 dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
110 if (dev)
111 return dev;
112
113 /*
114 * We have a configurable component - circle through the AMBA bus
115 * looking for the device that matches the endpoint node.
116 */
117 return bus_find_device_by_fwnode(&amba_bustype, fwnode);
118}
119
120/*
121 * Find a registered coresight device from a device fwnode.
122 * The node info is associated with the AMBA parent, but the
123 * csdev keeps a copy so iterate round the coresight bus to
124 * find the device.
125 */
126struct coresight_device *
127coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode)
128{
129 struct device *dev;
130 struct coresight_device *csdev = NULL;
131
132 dev = bus_find_device_by_fwnode(&coresight_bustype, r_fwnode);
133 if (dev) {
134 csdev = to_coresight_device(dev);
135 put_device(dev);
136 }
137 return csdev;
138}
139EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
140
141#ifdef CONFIG_OF
142static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
143{
144 return of_property_read_bool(ep, "slave-mode");
145}
146
147static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
148{
149 struct device_node *parent = of_graph_get_port_parent(ep);
150
151 /*
152 * Skip one-level up to the real device node, if we
153 * are using the new bindings.
154 */
155 if (of_node_name_eq(parent, "in-ports") ||
156 of_node_name_eq(parent, "out-ports"))
157 parent = of_get_next_parent(parent);
158
159 return parent;
160}
161
162static inline struct device_node *
163of_coresight_get_output_ports_node(const struct device_node *node)
164{
165 return of_get_child_by_name(node, "out-ports");
166}
167
168static int of_coresight_get_cpu(struct device *dev)
169{
170 int cpu;
171 struct device_node *dn;
172
173 if (!dev->of_node)
174 return -ENODEV;
175
176 dn = of_parse_phandle(dev->of_node, "cpu", 0);
177 if (!dn)
178 return -ENODEV;
179
180 cpu = of_cpu_node_to_id(dn);
181 of_node_put(dn);
182
183 return cpu;
184}
185
186/*
187 * of_coresight_parse_endpoint : Parse the given output endpoint @ep
188 * and fill the connection information in @pdata->out_conns
189 *
190 * Parses the local port, remote device name and the remote port.
191 *
192 * Returns :
193 * 0 - If the parsing completed without any fatal errors.
194 * -Errno - Fatal error, abort the scanning.
195 */
196static int of_coresight_parse_endpoint(struct device *dev,
197 struct device_node *ep,
198 struct coresight_platform_data *pdata)
199{
200 int ret = 0;
201 struct of_endpoint endpoint, rendpoint;
202 struct device_node *rparent = NULL;
203 struct device_node *rep = NULL;
204 struct device *rdev = NULL;
205 struct fwnode_handle *rdev_fwnode;
206 struct coresight_connection conn = {};
207 struct coresight_connection *new_conn;
208
209 do {
210 /* Parse the local port details */
211 if (of_graph_parse_endpoint(ep, &endpoint))
212 break;
213 /*
214 * Get a handle on the remote endpoint and the device it is
215 * attached to.
216 */
217 rep = of_graph_get_remote_endpoint(ep);
218 if (!rep)
219 break;
220 rparent = of_coresight_get_port_parent(rep);
221 if (!rparent)
222 break;
223 if (of_graph_parse_endpoint(rep, &rendpoint))
224 break;
225
226 rdev_fwnode = of_fwnode_handle(rparent);
227 /* If the remote device is not available, defer probing */
228 rdev = coresight_find_device_by_fwnode(rdev_fwnode);
229 if (!rdev) {
230 ret = -EPROBE_DEFER;
231 break;
232 }
233
234 conn.src_port = endpoint.port;
235 /*
236 * Hold the refcount to the target device. This could be
237 * released via:
238 * 1) coresight_release_platform_data() if the probe fails or
239 * this device is unregistered.
240 * 2) While removing the target device via
241 * coresight_remove_match()
242 */
243 conn.dest_fwnode = fwnode_handle_get(rdev_fwnode);
244 conn.dest_port = rendpoint.port;
245
246 new_conn = coresight_add_out_conn(dev, pdata, &conn);
247 if (IS_ERR_VALUE(new_conn)) {
248 fwnode_handle_put(conn.dest_fwnode);
249 return PTR_ERR(new_conn);
250 }
251 /* Connection record updated */
252 } while (0);
253
254 of_node_put(rparent);
255 of_node_put(rep);
256 put_device(rdev);
257
258 return ret;
259}
260
261static int of_get_coresight_platform_data(struct device *dev,
262 struct coresight_platform_data *pdata)
263{
264 int ret = 0;
265 struct device_node *ep = NULL;
266 const struct device_node *parent = NULL;
267 bool legacy_binding = false;
268 struct device_node *node = dev->of_node;
269
270 parent = of_coresight_get_output_ports_node(node);
271 /*
272 * If the DT uses obsoleted bindings, the ports are listed
273 * under the device and we need to filter out the input
274 * ports.
275 */
276 if (!parent) {
277 /*
278 * Avoid warnings in of_graph_get_next_endpoint()
279 * if the device doesn't have any graph connections
280 */
281 if (!of_graph_is_present(node))
282 return 0;
283 legacy_binding = true;
284 parent = node;
285 dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
286 }
287
288 /* Iterate through each output port to discover topology */
289 while ((ep = of_graph_get_next_endpoint(parent, ep))) {
290 /*
291 * Legacy binding mixes input/output ports under the
292 * same parent. So, skip the input ports if we are dealing
293 * with legacy binding, as they processed with their
294 * connected output ports.
295 */
296 if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
297 continue;
298
299 ret = of_coresight_parse_endpoint(dev, ep, pdata);
300 if (ret)
301 return ret;
302 }
303
304 return 0;
305}
306#else
307static inline int
308of_get_coresight_platform_data(struct device *dev,
309 struct coresight_platform_data *pdata)
310{
311 return -ENOENT;
312}
313
314static inline int of_coresight_get_cpu(struct device *dev)
315{
316 return -ENODEV;
317}
318#endif
319
320#ifdef CONFIG_ACPI
321
322#include <acpi/actypes.h>
323#include <acpi/processor.h>
324
325/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
326static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
327 0xbd, 0x68, 0xf7, 0xd3,
328 0x44, 0xef, 0x21, 0x53);
329/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
330static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
331 0x81, 0x07, 0xe6, 0x27,
332 0xf8, 0x05, 0xc6, 0xcd);
333#define ACPI_CORESIGHT_LINK_SLAVE 0
334#define ACPI_CORESIGHT_LINK_MASTER 1
335
336static inline bool is_acpi_guid(const union acpi_object *obj)
337{
338 return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
339}
340
341/*
342 * acpi_guid_matches - Checks if the given object is a GUID object and
343 * that it matches the supplied the GUID.
344 */
345static inline bool acpi_guid_matches(const union acpi_object *obj,
346 const guid_t *guid)
347{
348 return is_acpi_guid(obj) &&
349 guid_equal((guid_t *)obj->buffer.pointer, guid);
350}
351
352static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
353{
354 return acpi_guid_matches(obj, &acpi_graph_uuid);
355}
356
357static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
358{
359 return acpi_guid_matches(obj, &coresight_graph_uuid);
360}
361
362static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
363{
364 const union acpi_object *graphid, *guid, *links;
365
366 if (obj->type != ACPI_TYPE_PACKAGE ||
367 obj->package.count < 3)
368 return false;
369
370 graphid = &obj->package.elements[0];
371 guid = &obj->package.elements[1];
372 links = &obj->package.elements[2];
373
374 if (graphid->type != ACPI_TYPE_INTEGER ||
375 links->type != ACPI_TYPE_INTEGER)
376 return false;
377
378 return is_acpi_coresight_graph_guid(guid);
379}
380
381/*
382 * acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
383 * to the ACPI _DSD Graph specification.
384 *
385 * ACPI Devices Graph property has the following format:
386 * {
387 * Revision - Integer, must be 0
388 * NumberOfGraphs - Integer, N indicating the following list.
389 * Graph[1],
390 * ...
391 * Graph[N]
392 * }
393 *
394 * And each Graph entry has the following format:
395 * {
396 * GraphID - Integer, identifying a graph the device belongs to.
397 * UUID - UUID identifying the specification that governs
398 * this graph. (e.g, see is_acpi_coresight_graph())
399 * NumberOfLinks - Number "N" of connections on this node of the graph.
400 * Links[1]
401 * ...
402 * Links[N]
403 * }
404 *
405 * Where each "Links" entry has the following format:
406 *
407 * {
408 * SourcePortAddress - Integer
409 * DestinationPortAddress - Integer
410 * DestinationDeviceName - Reference to another device
411 * ( --- CoreSight specific extensions below ---)
412 * DirectionOfFlow - Integer 1 for output(master)
413 * 0 for input(slave)
414 * }
415 *
416 * e.g:
417 * For a Funnel device
418 *
419 * Device(MFUN) {
420 * ...
421 *
422 * Name (_DSD, Package() {
423 * // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
424 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
425 * Package() {
426 * Package(2) { "property-name", <property-value> }
427 * },
428 *
429 * ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
430 * Package() {
431 * 0, // Revision
432 * 1, // NumberOfGraphs.
433 * Package() { // Graph[0] Package
434 * 1, // GraphID
435 * // Coresight Graph UUID
436 * ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
437 * 3, // NumberOfLinks aka ports
438 * // Link[0]: Output_0 -> Replicator:Input_0
439 * Package () { 0, 0, \_SB_.RPL0, 1 },
440 * // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
441 * Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
442 * // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
443 * Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
444 * } // End of Graph[0] Package
445 *
446 * }, // End of ACPI Graph Property
447 * })
448 */
449static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
450{
451 int i, n;
452 const union acpi_object *rev, *nr_graphs;
453
454 /* The graph must contain at least the Revision and Number of Graphs */
455 if (graph->package.count < 2)
456 return false;
457
458 rev = &graph->package.elements[0];
459 nr_graphs = &graph->package.elements[1];
460
461 if (rev->type != ACPI_TYPE_INTEGER ||
462 nr_graphs->type != ACPI_TYPE_INTEGER)
463 return false;
464
465 /* We only support revision 0 */
466 if (rev->integer.value != 0)
467 return false;
468
469 n = nr_graphs->integer.value;
470 /* CoreSight devices are only part of a single Graph */
471 if (n != 1)
472 return false;
473
474 /* Make sure the ACPI graph package has right number of elements */
475 if (graph->package.count != (n + 2))
476 return false;
477
478 /*
479 * Each entry must be a graph package with at least 3 members :
480 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
481 */
482 for (i = 2; i < n + 2; i++) {
483 const union acpi_object *obj = &graph->package.elements[i];
484
485 if (obj->type != ACPI_TYPE_PACKAGE ||
486 obj->package.count < 3)
487 return false;
488 }
489
490 return true;
491}
492
493/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
494static const union acpi_object *
495acpi_get_dsd_graph(struct acpi_device *adev, struct acpi_buffer *buf)
496{
497 int i;
498 acpi_status status;
499 const union acpi_object *dsd;
500
501 status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
502 buf, ACPI_TYPE_PACKAGE);
503 if (ACPI_FAILURE(status))
504 return NULL;
505
506 dsd = buf->pointer;
507
508 /*
509 * _DSD property consists tuples { Prop_UUID, Package() }
510 * Iterate through all the packages and find the Graph.
511 */
512 for (i = 0; i + 1 < dsd->package.count; i += 2) {
513 const union acpi_object *guid, *package;
514
515 guid = &dsd->package.elements[i];
516 package = &dsd->package.elements[i + 1];
517
518 /* All _DSD elements must have a UUID and a Package */
519 if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
520 break;
521 /* Skip the non-Graph _DSD packages */
522 if (!is_acpi_dsd_graph_guid(guid))
523 continue;
524 if (acpi_validate_dsd_graph(package))
525 return package;
526 /* Invalid graph format, continue */
527 dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
528 }
529
530 return NULL;
531}
532
533static inline bool
534acpi_validate_coresight_graph(const union acpi_object *cs_graph)
535{
536 int nlinks;
537
538 nlinks = cs_graph->package.elements[2].integer.value;
539 /*
540 * Graph must have the following fields :
541 * { GraphID, GraphUUID, NumberOfLinks, Links... }
542 */
543 if (cs_graph->package.count != (nlinks + 3))
544 return false;
545 /* The links are validated in acpi_coresight_parse_link() */
546 return true;
547}
548
549/*
550 * acpi_get_coresight_graph - Parse the device _DSD tables and find
551 * the Graph property matching the CoreSight Graphs.
552 *
553 * Returns the pointer to the CoreSight Graph Package when found. Otherwise
554 * returns NULL.
555 */
556static const union acpi_object *
557acpi_get_coresight_graph(struct acpi_device *adev, struct acpi_buffer *buf)
558{
559 const union acpi_object *graph_list, *graph;
560 int i, nr_graphs;
561
562 graph_list = acpi_get_dsd_graph(adev, buf);
563 if (!graph_list)
564 return graph_list;
565
566 nr_graphs = graph_list->package.elements[1].integer.value;
567
568 for (i = 2; i < nr_graphs + 2; i++) {
569 graph = &graph_list->package.elements[i];
570 if (!is_acpi_coresight_graph(graph))
571 continue;
572 if (acpi_validate_coresight_graph(graph))
573 return graph;
574 /* Invalid graph format */
575 break;
576 }
577
578 return NULL;
579}
580
581/*
582 * acpi_coresight_parse_link - Parse the given Graph connection
583 * of the device and populate the coresight_connection for an output
584 * connection.
585 *
586 * CoreSight Graph specification mandates that the direction of the data
587 * flow must be specified in the link. i.e,
588 *
589 * SourcePortAddress, // Integer
590 * DestinationPortAddress, // Integer
591 * DestinationDeviceName, // Reference to another device
592 * DirectionOfFlow, // 1 for output(master), 0 for input(slave)
593 *
594 * Returns the direction of the data flow [ Input(slave) or Output(master) ]
595 * upon success.
596 * Returns an negative error number otherwise.
597 */
598static int acpi_coresight_parse_link(struct acpi_device *adev,
599 const union acpi_object *link,
600 struct coresight_connection *conn)
601{
602 int dir;
603 const union acpi_object *fields;
604 struct acpi_device *r_adev;
605 struct device *rdev;
606
607 if (link->type != ACPI_TYPE_PACKAGE ||
608 link->package.count != 4)
609 return -EINVAL;
610
611 fields = link->package.elements;
612
613 if (fields[0].type != ACPI_TYPE_INTEGER ||
614 fields[1].type != ACPI_TYPE_INTEGER ||
615 fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
616 fields[3].type != ACPI_TYPE_INTEGER)
617 return -EINVAL;
618
619 r_adev = acpi_fetch_acpi_dev(fields[2].reference.handle);
620 if (!r_adev)
621 return -ENODEV;
622
623 dir = fields[3].integer.value;
624 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
625 conn->src_port = fields[0].integer.value;
626 conn->dest_port = fields[1].integer.value;
627 rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
628 if (!rdev)
629 return -EPROBE_DEFER;
630 /*
631 * Hold the refcount to the target device. This could be
632 * released via:
633 * 1) coresight_release_platform_data() if the probe fails or
634 * this device is unregistered.
635 * 2) While removing the target device via
636 * coresight_remove_match().
637 */
638 conn->dest_fwnode = fwnode_handle_get(&r_adev->fwnode);
639 } else if (dir == ACPI_CORESIGHT_LINK_SLAVE) {
640 /*
641 * We are only interested in the port number
642 * for the input ports at this component.
643 * Store the port number in child_port.
644 */
645 conn->dest_port = fields[0].integer.value;
646 } else {
647 /* Invalid direction */
648 return -EINVAL;
649 }
650
651 return dir;
652}
653
654/*
655 * acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
656 * connection information and populate the supplied coresight_platform_data
657 * instance.
658 */
659static int acpi_coresight_parse_graph(struct device *dev,
660 struct acpi_device *adev,
661 struct coresight_platform_data *pdata)
662{
663 int ret = 0;
664 int i, nlinks;
665 const union acpi_object *graph;
666 struct coresight_connection conn, zero_conn = {};
667 struct coresight_connection *new_conn;
668 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
669
670 graph = acpi_get_coresight_graph(adev, &buf);
671 /*
672 * There are no graph connections, which is fine for some components.
673 * e.g., ETE
674 */
675 if (!graph)
676 goto free;
677
678 nlinks = graph->package.elements[2].integer.value;
679 if (!nlinks)
680 goto free;
681
682 for (i = 0; i < nlinks; i++) {
683 const union acpi_object *link = &graph->package.elements[3 + i];
684 int dir;
685
686 conn = zero_conn;
687 dir = acpi_coresight_parse_link(adev, link, &conn);
688 if (dir < 0) {
689 ret = dir;
690 goto free;
691 }
692
693 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
694 new_conn = coresight_add_out_conn(dev, pdata, &conn);
695 if (IS_ERR(new_conn)) {
696 ret = PTR_ERR(new_conn);
697 goto free;
698 }
699 }
700 }
701
702free:
703 /*
704 * When ACPI fails to alloc a buffer, it will free the buffer
705 * created via ACPI_ALLOCATE_BUFFER and set to NULL.
706 * ACPI_FREE can handle NULL pointers, so free it directly.
707 */
708 ACPI_FREE(buf.pointer);
709 return ret;
710}
711
712/*
713 * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
714 * logical CPU id of the corresponding CPU device.
715 *
716 * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
717 */
718static int
719acpi_handle_to_logical_cpuid(acpi_handle handle)
720{
721 int i;
722 struct acpi_processor *pr;
723
724 for_each_possible_cpu(i) {
725 pr = per_cpu(processors, i);
726 if (pr && pr->handle == handle)
727 break;
728 }
729
730 return i;
731}
732
733/*
734 * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
735 * with this coresight device. With ACPI bindings, the CoreSight components
736 * are listed as child device of the associated CPU.
737 *
738 * Returns the logical CPU id when found. Otherwise returns 0.
739 */
740static int acpi_coresight_get_cpu(struct device *dev)
741{
742 int cpu;
743 acpi_handle cpu_handle;
744 acpi_status status;
745 struct acpi_device *adev = ACPI_COMPANION(dev);
746
747 if (!adev)
748 return -ENODEV;
749 status = acpi_get_parent(adev->handle, &cpu_handle);
750 if (ACPI_FAILURE(status))
751 return -ENODEV;
752
753 cpu = acpi_handle_to_logical_cpuid(cpu_handle);
754 if (cpu >= nr_cpu_ids)
755 return -ENODEV;
756 return cpu;
757}
758
759static int
760acpi_get_coresight_platform_data(struct device *dev,
761 struct coresight_platform_data *pdata)
762{
763 struct acpi_device *adev;
764
765 adev = ACPI_COMPANION(dev);
766 if (!adev)
767 return -EINVAL;
768
769 return acpi_coresight_parse_graph(dev, adev, pdata);
770}
771
772#else
773
774static inline int
775acpi_get_coresight_platform_data(struct device *dev,
776 struct coresight_platform_data *pdata)
777{
778 return -ENOENT;
779}
780
781static inline int acpi_coresight_get_cpu(struct device *dev)
782{
783 return -ENODEV;
784}
785#endif
786
787int coresight_get_cpu(struct device *dev)
788{
789 if (is_of_node(dev->fwnode))
790 return of_coresight_get_cpu(dev);
791 else if (is_acpi_device_node(dev->fwnode))
792 return acpi_coresight_get_cpu(dev);
793 return 0;
794}
795EXPORT_SYMBOL_GPL(coresight_get_cpu);
796
797struct coresight_platform_data *
798coresight_get_platform_data(struct device *dev)
799{
800 int ret = -ENOENT;
801 struct coresight_platform_data *pdata = NULL;
802 struct fwnode_handle *fwnode = dev_fwnode(dev);
803
804 if (IS_ERR_OR_NULL(fwnode))
805 goto error;
806
807 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
808 if (!pdata) {
809 ret = -ENOMEM;
810 goto error;
811 }
812
813 if (is_of_node(fwnode))
814 ret = of_get_coresight_platform_data(dev, pdata);
815 else if (is_acpi_device_node(fwnode))
816 ret = acpi_get_coresight_platform_data(dev, pdata);
817
818 if (!ret)
819 return pdata;
820error:
821 if (!IS_ERR_OR_NULL(pdata))
822 /* Cleanup the connection information */
823 coresight_release_platform_data(NULL, dev, pdata);
824 return ERR_PTR(ret);
825}
826EXPORT_SYMBOL_GPL(coresight_get_platform_data);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2012, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/acpi.h>
7#include <linux/types.h>
8#include <linux/err.h>
9#include <linux/slab.h>
10#include <linux/clk.h>
11#include <linux/of.h>
12#include <linux/of_address.h>
13#include <linux/of_graph.h>
14#include <linux/of_platform.h>
15#include <linux/platform_device.h>
16#include <linux/amba/bus.h>
17#include <linux/coresight.h>
18#include <linux/cpumask.h>
19#include <asm/smp_plat.h>
20
21#include "coresight-priv.h"
22/*
23 * coresight_alloc_conns: Allocate connections record for each output
24 * port from the device.
25 */
26static int coresight_alloc_conns(struct device *dev,
27 struct coresight_platform_data *pdata)
28{
29 if (pdata->nr_outport) {
30 pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
31 sizeof(*pdata->conns),
32 GFP_KERNEL);
33 if (!pdata->conns)
34 return -ENOMEM;
35 }
36
37 return 0;
38}
39
40static struct device *
41coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
42{
43 struct device *dev = NULL;
44
45 /*
46 * If we have a non-configurable replicator, it will be found on the
47 * platform bus.
48 */
49 dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
50 if (dev)
51 return dev;
52
53 /*
54 * We have a configurable component - circle through the AMBA bus
55 * looking for the device that matches the endpoint node.
56 */
57 return bus_find_device_by_fwnode(&amba_bustype, fwnode);
58}
59
60#ifdef CONFIG_OF
61static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
62{
63 return of_property_read_bool(ep, "slave-mode");
64}
65
66static void of_coresight_get_ports_legacy(const struct device_node *node,
67 int *nr_inport, int *nr_outport)
68{
69 struct device_node *ep = NULL;
70 int in = 0, out = 0;
71
72 do {
73 ep = of_graph_get_next_endpoint(node, ep);
74 if (!ep)
75 break;
76
77 if (of_coresight_legacy_ep_is_input(ep))
78 in++;
79 else
80 out++;
81
82 } while (ep);
83
84 *nr_inport = in;
85 *nr_outport = out;
86}
87
88static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
89{
90 struct device_node *parent = of_graph_get_port_parent(ep);
91
92 /*
93 * Skip one-level up to the real device node, if we
94 * are using the new bindings.
95 */
96 if (of_node_name_eq(parent, "in-ports") ||
97 of_node_name_eq(parent, "out-ports"))
98 parent = of_get_next_parent(parent);
99
100 return parent;
101}
102
103static inline struct device_node *
104of_coresight_get_input_ports_node(const struct device_node *node)
105{
106 return of_get_child_by_name(node, "in-ports");
107}
108
109static inline struct device_node *
110of_coresight_get_output_ports_node(const struct device_node *node)
111{
112 return of_get_child_by_name(node, "out-ports");
113}
114
115static inline int
116of_coresight_count_ports(struct device_node *port_parent)
117{
118 int i = 0;
119 struct device_node *ep = NULL;
120
121 while ((ep = of_graph_get_next_endpoint(port_parent, ep)))
122 i++;
123 return i;
124}
125
126static void of_coresight_get_ports(const struct device_node *node,
127 int *nr_inport, int *nr_outport)
128{
129 struct device_node *input_ports = NULL, *output_ports = NULL;
130
131 input_ports = of_coresight_get_input_ports_node(node);
132 output_ports = of_coresight_get_output_ports_node(node);
133
134 if (input_ports || output_ports) {
135 if (input_ports) {
136 *nr_inport = of_coresight_count_ports(input_ports);
137 of_node_put(input_ports);
138 }
139 if (output_ports) {
140 *nr_outport = of_coresight_count_ports(output_ports);
141 of_node_put(output_ports);
142 }
143 } else {
144 /* Fall back to legacy DT bindings parsing */
145 of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
146 }
147}
148
149static int of_coresight_get_cpu(struct device *dev)
150{
151 int cpu;
152 struct device_node *dn;
153
154 if (!dev->of_node)
155 return -ENODEV;
156
157 dn = of_parse_phandle(dev->of_node, "cpu", 0);
158 if (!dn)
159 return -ENODEV;
160
161 cpu = of_cpu_node_to_id(dn);
162 of_node_put(dn);
163
164 return cpu;
165}
166
167/*
168 * of_coresight_parse_endpoint : Parse the given output endpoint @ep
169 * and fill the connection information in @conn
170 *
171 * Parses the local port, remote device name and the remote port.
172 *
173 * Returns :
174 * 1 - If the parsing is successful and a connection record
175 * was created for an output connection.
176 * 0 - If the parsing completed without any fatal errors.
177 * -Errno - Fatal error, abort the scanning.
178 */
179static int of_coresight_parse_endpoint(struct device *dev,
180 struct device_node *ep,
181 struct coresight_connection *conn)
182{
183 int ret = 0;
184 struct of_endpoint endpoint, rendpoint;
185 struct device_node *rparent = NULL;
186 struct device_node *rep = NULL;
187 struct device *rdev = NULL;
188 struct fwnode_handle *rdev_fwnode;
189
190 do {
191 /* Parse the local port details */
192 if (of_graph_parse_endpoint(ep, &endpoint))
193 break;
194 /*
195 * Get a handle on the remote endpoint and the device it is
196 * attached to.
197 */
198 rep = of_graph_get_remote_endpoint(ep);
199 if (!rep)
200 break;
201 rparent = of_coresight_get_port_parent(rep);
202 if (!rparent)
203 break;
204 if (of_graph_parse_endpoint(rep, &rendpoint))
205 break;
206
207 rdev_fwnode = of_fwnode_handle(rparent);
208 /* If the remote device is not available, defer probing */
209 rdev = coresight_find_device_by_fwnode(rdev_fwnode);
210 if (!rdev) {
211 ret = -EPROBE_DEFER;
212 break;
213 }
214
215 conn->outport = endpoint.port;
216 /*
217 * Hold the refcount to the target device. This could be
218 * released via:
219 * 1) coresight_release_platform_data() if the probe fails or
220 * this device is unregistered.
221 * 2) While removing the target device via
222 * coresight_remove_match()
223 */
224 conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
225 conn->child_port = rendpoint.port;
226 /* Connection record updated */
227 ret = 1;
228 } while (0);
229
230 of_node_put(rparent);
231 of_node_put(rep);
232 put_device(rdev);
233
234 return ret;
235}
236
237static int of_get_coresight_platform_data(struct device *dev,
238 struct coresight_platform_data *pdata)
239{
240 int ret = 0;
241 struct coresight_connection *conn;
242 struct device_node *ep = NULL;
243 const struct device_node *parent = NULL;
244 bool legacy_binding = false;
245 struct device_node *node = dev->of_node;
246
247 /* Get the number of input and output port for this component */
248 of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
249
250 /* If there are no output connections, we are done */
251 if (!pdata->nr_outport)
252 return 0;
253
254 ret = coresight_alloc_conns(dev, pdata);
255 if (ret)
256 return ret;
257
258 parent = of_coresight_get_output_ports_node(node);
259 /*
260 * If the DT uses obsoleted bindings, the ports are listed
261 * under the device and we need to filter out the input
262 * ports.
263 */
264 if (!parent) {
265 legacy_binding = true;
266 parent = node;
267 dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
268 }
269
270 conn = pdata->conns;
271
272 /* Iterate through each output port to discover topology */
273 while ((ep = of_graph_get_next_endpoint(parent, ep))) {
274 /*
275 * Legacy binding mixes input/output ports under the
276 * same parent. So, skip the input ports if we are dealing
277 * with legacy binding, as they processed with their
278 * connected output ports.
279 */
280 if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
281 continue;
282
283 ret = of_coresight_parse_endpoint(dev, ep, conn);
284 switch (ret) {
285 case 1:
286 conn++; /* Fall through */
287 case 0:
288 break;
289 default:
290 return ret;
291 }
292 }
293
294 return 0;
295}
296#else
297static inline int
298of_get_coresight_platform_data(struct device *dev,
299 struct coresight_platform_data *pdata)
300{
301 return -ENOENT;
302}
303
304static inline int of_coresight_get_cpu(struct device *dev)
305{
306 return -ENODEV;
307}
308#endif
309
310#ifdef CONFIG_ACPI
311
312#include <acpi/actypes.h>
313#include <acpi/processor.h>
314
315/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
316static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
317 0xbd, 0x68, 0xf7, 0xd3,
318 0x44, 0xef, 0x21, 0x53);
319/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
320static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
321 0x81, 0x07, 0xe6, 0x27,
322 0xf8, 0x05, 0xc6, 0xcd);
323#define ACPI_CORESIGHT_LINK_SLAVE 0
324#define ACPI_CORESIGHT_LINK_MASTER 1
325
326static inline bool is_acpi_guid(const union acpi_object *obj)
327{
328 return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
329}
330
331/*
332 * acpi_guid_matches - Checks if the given object is a GUID object and
333 * that it matches the supplied the GUID.
334 */
335static inline bool acpi_guid_matches(const union acpi_object *obj,
336 const guid_t *guid)
337{
338 return is_acpi_guid(obj) &&
339 guid_equal((guid_t *)obj->buffer.pointer, guid);
340}
341
342static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
343{
344 return acpi_guid_matches(obj, &acpi_graph_uuid);
345}
346
347static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
348{
349 return acpi_guid_matches(obj, &coresight_graph_uuid);
350}
351
352static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
353{
354 const union acpi_object *graphid, *guid, *links;
355
356 if (obj->type != ACPI_TYPE_PACKAGE ||
357 obj->package.count < 3)
358 return false;
359
360 graphid = &obj->package.elements[0];
361 guid = &obj->package.elements[1];
362 links = &obj->package.elements[2];
363
364 if (graphid->type != ACPI_TYPE_INTEGER ||
365 links->type != ACPI_TYPE_INTEGER)
366 return false;
367
368 return is_acpi_coresight_graph_guid(guid);
369}
370
371/*
372 * acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
373 * to the ACPI _DSD Graph specification.
374 *
375 * ACPI Devices Graph property has the following format:
376 * {
377 * Revision - Integer, must be 0
378 * NumberOfGraphs - Integer, N indicating the following list.
379 * Graph[1],
380 * ...
381 * Graph[N]
382 * }
383 *
384 * And each Graph entry has the following format:
385 * {
386 * GraphID - Integer, identifying a graph the device belongs to.
387 * UUID - UUID identifying the specification that governs
388 * this graph. (e.g, see is_acpi_coresight_graph())
389 * NumberOfLinks - Number "N" of connections on this node of the graph.
390 * Links[1]
391 * ...
392 * Links[N]
393 * }
394 *
395 * Where each "Links" entry has the following format:
396 *
397 * {
398 * SourcePortAddress - Integer
399 * DestinationPortAddress - Integer
400 * DestinationDeviceName - Reference to another device
401 * ( --- CoreSight specific extensions below ---)
402 * DirectionOfFlow - Integer 1 for output(master)
403 * 0 for input(slave)
404 * }
405 *
406 * e.g:
407 * For a Funnel device
408 *
409 * Device(MFUN) {
410 * ...
411 *
412 * Name (_DSD, Package() {
413 * // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
414 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
415 * Package() {
416 * Package(2) { "property-name", <property-value> }
417 * },
418 *
419 * ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
420 * Package() {
421 * 0, // Revision
422 * 1, // NumberOfGraphs.
423 * Package() { // Graph[0] Package
424 * 1, // GraphID
425 * // Coresight Graph UUID
426 * ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
427 * 3, // NumberOfLinks aka ports
428 * // Link[0]: Output_0 -> Replicator:Input_0
429 * Package () { 0, 0, \_SB_.RPL0, 1 },
430 * // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
431 * Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
432 * // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
433 * Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
434 * } // End of Graph[0] Package
435 *
436 * }, // End of ACPI Graph Property
437 * })
438 */
439static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
440{
441 int i, n;
442 const union acpi_object *rev, *nr_graphs;
443
444 /* The graph must contain at least the Revision and Number of Graphs */
445 if (graph->package.count < 2)
446 return false;
447
448 rev = &graph->package.elements[0];
449 nr_graphs = &graph->package.elements[1];
450
451 if (rev->type != ACPI_TYPE_INTEGER ||
452 nr_graphs->type != ACPI_TYPE_INTEGER)
453 return false;
454
455 /* We only support revision 0 */
456 if (rev->integer.value != 0)
457 return false;
458
459 n = nr_graphs->integer.value;
460 /* CoreSight devices are only part of a single Graph */
461 if (n != 1)
462 return false;
463
464 /* Make sure the ACPI graph package has right number of elements */
465 if (graph->package.count != (n + 2))
466 return false;
467
468 /*
469 * Each entry must be a graph package with at least 3 members :
470 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
471 */
472 for (i = 2; i < n + 2; i++) {
473 const union acpi_object *obj = &graph->package.elements[i];
474
475 if (obj->type != ACPI_TYPE_PACKAGE ||
476 obj->package.count < 3)
477 return false;
478 }
479
480 return true;
481}
482
483/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
484const union acpi_object *
485acpi_get_dsd_graph(struct acpi_device *adev)
486{
487 int i;
488 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
489 acpi_status status;
490 const union acpi_object *dsd;
491
492 status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
493 &buf, ACPI_TYPE_PACKAGE);
494 if (ACPI_FAILURE(status))
495 return NULL;
496
497 dsd = buf.pointer;
498
499 /*
500 * _DSD property consists tuples { Prop_UUID, Package() }
501 * Iterate through all the packages and find the Graph.
502 */
503 for (i = 0; i + 1 < dsd->package.count; i += 2) {
504 const union acpi_object *guid, *package;
505
506 guid = &dsd->package.elements[i];
507 package = &dsd->package.elements[i + 1];
508
509 /* All _DSD elements must have a UUID and a Package */
510 if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
511 break;
512 /* Skip the non-Graph _DSD packages */
513 if (!is_acpi_dsd_graph_guid(guid))
514 continue;
515 if (acpi_validate_dsd_graph(package))
516 return package;
517 /* Invalid graph format, continue */
518 dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
519 }
520
521 return NULL;
522}
523
524static inline bool
525acpi_validate_coresight_graph(const union acpi_object *cs_graph)
526{
527 int nlinks;
528
529 nlinks = cs_graph->package.elements[2].integer.value;
530 /*
531 * Graph must have the following fields :
532 * { GraphID, GraphUUID, NumberOfLinks, Links... }
533 */
534 if (cs_graph->package.count != (nlinks + 3))
535 return false;
536 /* The links are validated in acpi_coresight_parse_link() */
537 return true;
538}
539
540/*
541 * acpi_get_coresight_graph - Parse the device _DSD tables and find
542 * the Graph property matching the CoreSight Graphs.
543 *
544 * Returns the pointer to the CoreSight Graph Package when found. Otherwise
545 * returns NULL.
546 */
547const union acpi_object *
548acpi_get_coresight_graph(struct acpi_device *adev)
549{
550 const union acpi_object *graph_list, *graph;
551 int i, nr_graphs;
552
553 graph_list = acpi_get_dsd_graph(adev);
554 if (!graph_list)
555 return graph_list;
556
557 nr_graphs = graph_list->package.elements[1].integer.value;
558
559 for (i = 2; i < nr_graphs + 2; i++) {
560 graph = &graph_list->package.elements[i];
561 if (!is_acpi_coresight_graph(graph))
562 continue;
563 if (acpi_validate_coresight_graph(graph))
564 return graph;
565 /* Invalid graph format */
566 break;
567 }
568
569 return NULL;
570}
571
572/*
573 * acpi_coresight_parse_link - Parse the given Graph connection
574 * of the device and populate the coresight_connection for an output
575 * connection.
576 *
577 * CoreSight Graph specification mandates that the direction of the data
578 * flow must be specified in the link. i.e,
579 *
580 * SourcePortAddress, // Integer
581 * DestinationPortAddress, // Integer
582 * DestinationDeviceName, // Reference to another device
583 * DirectionOfFlow, // 1 for output(master), 0 for input(slave)
584 *
585 * Returns the direction of the data flow [ Input(slave) or Output(master) ]
586 * upon success.
587 * Returns an negative error number otherwise.
588 */
589static int acpi_coresight_parse_link(struct acpi_device *adev,
590 const union acpi_object *link,
591 struct coresight_connection *conn)
592{
593 int rc, dir;
594 const union acpi_object *fields;
595 struct acpi_device *r_adev;
596 struct device *rdev;
597
598 if (link->type != ACPI_TYPE_PACKAGE ||
599 link->package.count != 4)
600 return -EINVAL;
601
602 fields = link->package.elements;
603
604 if (fields[0].type != ACPI_TYPE_INTEGER ||
605 fields[1].type != ACPI_TYPE_INTEGER ||
606 fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
607 fields[3].type != ACPI_TYPE_INTEGER)
608 return -EINVAL;
609
610 rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev);
611 if (rc)
612 return rc;
613
614 dir = fields[3].integer.value;
615 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
616 conn->outport = fields[0].integer.value;
617 conn->child_port = fields[1].integer.value;
618 rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
619 if (!rdev)
620 return -EPROBE_DEFER;
621 /*
622 * Hold the refcount to the target device. This could be
623 * released via:
624 * 1) coresight_release_platform_data() if the probe fails or
625 * this device is unregistered.
626 * 2) While removing the target device via
627 * coresight_remove_match().
628 */
629 conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
630 }
631
632 return dir;
633}
634
635/*
636 * acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
637 * connection information and populate the supplied coresight_platform_data
638 * instance.
639 */
640static int acpi_coresight_parse_graph(struct acpi_device *adev,
641 struct coresight_platform_data *pdata)
642{
643 int rc, i, nlinks;
644 const union acpi_object *graph;
645 struct coresight_connection *conns, *ptr;
646
647 pdata->nr_inport = pdata->nr_outport = 0;
648 graph = acpi_get_coresight_graph(adev);
649 if (!graph)
650 return -ENOENT;
651
652 nlinks = graph->package.elements[2].integer.value;
653 if (!nlinks)
654 return 0;
655
656 /*
657 * To avoid scanning the table twice (once for finding the number of
658 * output links and then later for parsing the output links),
659 * cache the links information in one go and then later copy
660 * it to the pdata.
661 */
662 conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
663 if (!conns)
664 return -ENOMEM;
665 ptr = conns;
666 for (i = 0; i < nlinks; i++) {
667 const union acpi_object *link = &graph->package.elements[3 + i];
668 int dir;
669
670 dir = acpi_coresight_parse_link(adev, link, ptr);
671 if (dir < 0)
672 return dir;
673
674 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
675 pdata->nr_outport++;
676 ptr++;
677 } else {
678 pdata->nr_inport++;
679 }
680 }
681
682 rc = coresight_alloc_conns(&adev->dev, pdata);
683 if (rc)
684 return rc;
685
686 /* Copy the connection information to the final location */
687 for (i = 0; i < pdata->nr_outport; i++)
688 pdata->conns[i] = conns[i];
689
690 devm_kfree(&adev->dev, conns);
691 return 0;
692}
693
694/*
695 * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
696 * logical CPU id of the corresponding CPU device.
697 *
698 * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
699 */
700static int
701acpi_handle_to_logical_cpuid(acpi_handle handle)
702{
703 int i;
704 struct acpi_processor *pr;
705
706 for_each_possible_cpu(i) {
707 pr = per_cpu(processors, i);
708 if (pr && pr->handle == handle)
709 break;
710 }
711
712 return i;
713}
714
715/*
716 * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
717 * with this coresight device. With ACPI bindings, the CoreSight components
718 * are listed as child device of the associated CPU.
719 *
720 * Returns the logical CPU id when found. Otherwise returns 0.
721 */
722static int acpi_coresight_get_cpu(struct device *dev)
723{
724 int cpu;
725 acpi_handle cpu_handle;
726 acpi_status status;
727 struct acpi_device *adev = ACPI_COMPANION(dev);
728
729 if (!adev)
730 return -ENODEV;
731 status = acpi_get_parent(adev->handle, &cpu_handle);
732 if (ACPI_FAILURE(status))
733 return -ENODEV;
734
735 cpu = acpi_handle_to_logical_cpuid(cpu_handle);
736 if (cpu >= nr_cpu_ids)
737 return -ENODEV;
738 return cpu;
739}
740
741static int
742acpi_get_coresight_platform_data(struct device *dev,
743 struct coresight_platform_data *pdata)
744{
745 struct acpi_device *adev;
746
747 adev = ACPI_COMPANION(dev);
748 if (!adev)
749 return -EINVAL;
750
751 return acpi_coresight_parse_graph(adev, pdata);
752}
753
754#else
755
756static inline int
757acpi_get_coresight_platform_data(struct device *dev,
758 struct coresight_platform_data *pdata)
759{
760 return -ENOENT;
761}
762
763static inline int acpi_coresight_get_cpu(struct device *dev)
764{
765 return -ENODEV;
766}
767#endif
768
769int coresight_get_cpu(struct device *dev)
770{
771 if (is_of_node(dev->fwnode))
772 return of_coresight_get_cpu(dev);
773 else if (is_acpi_device_node(dev->fwnode))
774 return acpi_coresight_get_cpu(dev);
775 return 0;
776}
777EXPORT_SYMBOL_GPL(coresight_get_cpu);
778
779struct coresight_platform_data *
780coresight_get_platform_data(struct device *dev)
781{
782 int ret = -ENOENT;
783 struct coresight_platform_data *pdata = NULL;
784 struct fwnode_handle *fwnode = dev_fwnode(dev);
785
786 if (IS_ERR_OR_NULL(fwnode))
787 goto error;
788
789 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
790 if (!pdata) {
791 ret = -ENOMEM;
792 goto error;
793 }
794
795 if (is_of_node(fwnode))
796 ret = of_get_coresight_platform_data(dev, pdata);
797 else if (is_acpi_device_node(fwnode))
798 ret = acpi_get_coresight_platform_data(dev, pdata);
799
800 if (!ret)
801 return pdata;
802error:
803 if (!IS_ERR_OR_NULL(pdata))
804 /* Cleanup the connection information */
805 coresight_release_platform_data(pdata);
806 return ERR_PTR(ret);
807}
808EXPORT_SYMBOL_GPL(coresight_get_platform_data);