Loading...
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_kcalloc(dev, pdata->nr_outport,
31 sizeof(*pdata->conns), GFP_KERNEL);
32 if (!pdata->conns)
33 return -ENOMEM;
34 }
35
36 return 0;
37}
38
39static struct device *
40coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
41{
42 struct device *dev = NULL;
43
44 /*
45 * If we have a non-configurable replicator, it will be found on the
46 * platform bus.
47 */
48 dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
49 if (dev)
50 return dev;
51
52 /*
53 * We have a configurable component - circle through the AMBA bus
54 * looking for the device that matches the endpoint node.
55 */
56 return bus_find_device_by_fwnode(&amba_bustype, fwnode);
57}
58
59/*
60 * Find a registered coresight device from a device fwnode.
61 * The node info is associated with the AMBA parent, but the
62 * csdev keeps a copy so iterate round the coresight bus to
63 * find the device.
64 */
65struct coresight_device *
66coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode)
67{
68 struct device *dev;
69 struct coresight_device *csdev = NULL;
70
71 dev = bus_find_device_by_fwnode(&coresight_bustype, r_fwnode);
72 if (dev) {
73 csdev = to_coresight_device(dev);
74 put_device(dev);
75 }
76 return csdev;
77}
78EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
79
80#ifdef CONFIG_OF
81static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
82{
83 return of_property_read_bool(ep, "slave-mode");
84}
85
86static void of_coresight_get_ports_legacy(const struct device_node *node,
87 int *nr_inport, int *nr_outport)
88{
89 struct device_node *ep = NULL;
90 struct of_endpoint endpoint;
91 int in = 0, out = 0;
92
93 /*
94 * Avoid warnings in of_graph_get_next_endpoint()
95 * if the device doesn't have any graph connections
96 */
97 if (!of_graph_is_present(node))
98 return;
99 do {
100 ep = of_graph_get_next_endpoint(node, ep);
101 if (!ep)
102 break;
103
104 if (of_graph_parse_endpoint(ep, &endpoint))
105 continue;
106
107 if (of_coresight_legacy_ep_is_input(ep)) {
108 in = (endpoint.port + 1 > in) ?
109 endpoint.port + 1 : in;
110 } else {
111 out = (endpoint.port + 1) > out ?
112 endpoint.port + 1 : out;
113 }
114
115 } while (ep);
116
117 *nr_inport = in;
118 *nr_outport = out;
119}
120
121static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
122{
123 struct device_node *parent = of_graph_get_port_parent(ep);
124
125 /*
126 * Skip one-level up to the real device node, if we
127 * are using the new bindings.
128 */
129 if (of_node_name_eq(parent, "in-ports") ||
130 of_node_name_eq(parent, "out-ports"))
131 parent = of_get_next_parent(parent);
132
133 return parent;
134}
135
136static inline struct device_node *
137of_coresight_get_input_ports_node(const struct device_node *node)
138{
139 return of_get_child_by_name(node, "in-ports");
140}
141
142static inline struct device_node *
143of_coresight_get_output_ports_node(const struct device_node *node)
144{
145 return of_get_child_by_name(node, "out-ports");
146}
147
148static inline int
149of_coresight_count_ports(struct device_node *port_parent)
150{
151 int i = 0;
152 struct device_node *ep = NULL;
153 struct of_endpoint endpoint;
154
155 while ((ep = of_graph_get_next_endpoint(port_parent, ep))) {
156 /* Defer error handling to parsing */
157 if (of_graph_parse_endpoint(ep, &endpoint))
158 continue;
159 if (endpoint.port + 1 > i)
160 i = endpoint.port + 1;
161 }
162
163 return i;
164}
165
166static void of_coresight_get_ports(const struct device_node *node,
167 int *nr_inport, int *nr_outport)
168{
169 struct device_node *input_ports = NULL, *output_ports = NULL;
170
171 input_ports = of_coresight_get_input_ports_node(node);
172 output_ports = of_coresight_get_output_ports_node(node);
173
174 if (input_ports || output_ports) {
175 if (input_ports) {
176 *nr_inport = of_coresight_count_ports(input_ports);
177 of_node_put(input_ports);
178 }
179 if (output_ports) {
180 *nr_outport = of_coresight_count_ports(output_ports);
181 of_node_put(output_ports);
182 }
183 } else {
184 /* Fall back to legacy DT bindings parsing */
185 of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
186 }
187}
188
189static int of_coresight_get_cpu(struct device *dev)
190{
191 int cpu;
192 struct device_node *dn;
193
194 if (!dev->of_node)
195 return -ENODEV;
196
197 dn = of_parse_phandle(dev->of_node, "cpu", 0);
198 if (!dn)
199 return -ENODEV;
200
201 cpu = of_cpu_node_to_id(dn);
202 of_node_put(dn);
203
204 return cpu;
205}
206
207/*
208 * of_coresight_parse_endpoint : Parse the given output endpoint @ep
209 * and fill the connection information in @conn
210 *
211 * Parses the local port, remote device name and the remote port.
212 *
213 * Returns :
214 * 0 - If the parsing completed without any fatal errors.
215 * -Errno - Fatal error, abort the scanning.
216 */
217static int of_coresight_parse_endpoint(struct device *dev,
218 struct device_node *ep,
219 struct coresight_platform_data *pdata)
220{
221 int ret = 0;
222 struct of_endpoint endpoint, rendpoint;
223 struct device_node *rparent = NULL;
224 struct device_node *rep = NULL;
225 struct device *rdev = NULL;
226 struct fwnode_handle *rdev_fwnode;
227 struct coresight_connection *conn;
228
229 do {
230 /* Parse the local port details */
231 if (of_graph_parse_endpoint(ep, &endpoint))
232 break;
233 /*
234 * Get a handle on the remote endpoint and the device it is
235 * attached to.
236 */
237 rep = of_graph_get_remote_endpoint(ep);
238 if (!rep)
239 break;
240 rparent = of_coresight_get_port_parent(rep);
241 if (!rparent)
242 break;
243 if (of_graph_parse_endpoint(rep, &rendpoint))
244 break;
245
246 rdev_fwnode = of_fwnode_handle(rparent);
247 /* If the remote device is not available, defer probing */
248 rdev = coresight_find_device_by_fwnode(rdev_fwnode);
249 if (!rdev) {
250 ret = -EPROBE_DEFER;
251 break;
252 }
253
254 conn = &pdata->conns[endpoint.port];
255 if (conn->child_fwnode) {
256 dev_warn(dev, "Duplicate output port %d\n",
257 endpoint.port);
258 ret = -EINVAL;
259 break;
260 }
261 conn->outport = endpoint.port;
262 /*
263 * Hold the refcount to the target device. This could be
264 * released via:
265 * 1) coresight_release_platform_data() if the probe fails or
266 * this device is unregistered.
267 * 2) While removing the target device via
268 * coresight_remove_match()
269 */
270 conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
271 conn->child_port = rendpoint.port;
272 /* Connection record updated */
273 } while (0);
274
275 of_node_put(rparent);
276 of_node_put(rep);
277 put_device(rdev);
278
279 return ret;
280}
281
282static int of_get_coresight_platform_data(struct device *dev,
283 struct coresight_platform_data *pdata)
284{
285 int ret = 0;
286 struct device_node *ep = NULL;
287 const struct device_node *parent = NULL;
288 bool legacy_binding = false;
289 struct device_node *node = dev->of_node;
290
291 /* Get the number of input and output port for this component */
292 of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
293
294 /* If there are no output connections, we are done */
295 if (!pdata->nr_outport)
296 return 0;
297
298 ret = coresight_alloc_conns(dev, pdata);
299 if (ret)
300 return ret;
301
302 parent = of_coresight_get_output_ports_node(node);
303 /*
304 * If the DT uses obsoleted bindings, the ports are listed
305 * under the device and we need to filter out the input
306 * ports.
307 */
308 if (!parent) {
309 legacy_binding = true;
310 parent = node;
311 dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
312 }
313
314 /* Iterate through each output port to discover topology */
315 while ((ep = of_graph_get_next_endpoint(parent, ep))) {
316 /*
317 * Legacy binding mixes input/output ports under the
318 * same parent. So, skip the input ports if we are dealing
319 * with legacy binding, as they processed with their
320 * connected output ports.
321 */
322 if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
323 continue;
324
325 ret = of_coresight_parse_endpoint(dev, ep, pdata);
326 if (ret)
327 return ret;
328 }
329
330 return 0;
331}
332#else
333static inline int
334of_get_coresight_platform_data(struct device *dev,
335 struct coresight_platform_data *pdata)
336{
337 return -ENOENT;
338}
339
340static inline int of_coresight_get_cpu(struct device *dev)
341{
342 return -ENODEV;
343}
344#endif
345
346#ifdef CONFIG_ACPI
347
348#include <acpi/actypes.h>
349#include <acpi/processor.h>
350
351/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
352static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
353 0xbd, 0x68, 0xf7, 0xd3,
354 0x44, 0xef, 0x21, 0x53);
355/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
356static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
357 0x81, 0x07, 0xe6, 0x27,
358 0xf8, 0x05, 0xc6, 0xcd);
359#define ACPI_CORESIGHT_LINK_SLAVE 0
360#define ACPI_CORESIGHT_LINK_MASTER 1
361
362static inline bool is_acpi_guid(const union acpi_object *obj)
363{
364 return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
365}
366
367/*
368 * acpi_guid_matches - Checks if the given object is a GUID object and
369 * that it matches the supplied the GUID.
370 */
371static inline bool acpi_guid_matches(const union acpi_object *obj,
372 const guid_t *guid)
373{
374 return is_acpi_guid(obj) &&
375 guid_equal((guid_t *)obj->buffer.pointer, guid);
376}
377
378static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
379{
380 return acpi_guid_matches(obj, &acpi_graph_uuid);
381}
382
383static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
384{
385 return acpi_guid_matches(obj, &coresight_graph_uuid);
386}
387
388static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
389{
390 const union acpi_object *graphid, *guid, *links;
391
392 if (obj->type != ACPI_TYPE_PACKAGE ||
393 obj->package.count < 3)
394 return false;
395
396 graphid = &obj->package.elements[0];
397 guid = &obj->package.elements[1];
398 links = &obj->package.elements[2];
399
400 if (graphid->type != ACPI_TYPE_INTEGER ||
401 links->type != ACPI_TYPE_INTEGER)
402 return false;
403
404 return is_acpi_coresight_graph_guid(guid);
405}
406
407/*
408 * acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
409 * to the ACPI _DSD Graph specification.
410 *
411 * ACPI Devices Graph property has the following format:
412 * {
413 * Revision - Integer, must be 0
414 * NumberOfGraphs - Integer, N indicating the following list.
415 * Graph[1],
416 * ...
417 * Graph[N]
418 * }
419 *
420 * And each Graph entry has the following format:
421 * {
422 * GraphID - Integer, identifying a graph the device belongs to.
423 * UUID - UUID identifying the specification that governs
424 * this graph. (e.g, see is_acpi_coresight_graph())
425 * NumberOfLinks - Number "N" of connections on this node of the graph.
426 * Links[1]
427 * ...
428 * Links[N]
429 * }
430 *
431 * Where each "Links" entry has the following format:
432 *
433 * {
434 * SourcePortAddress - Integer
435 * DestinationPortAddress - Integer
436 * DestinationDeviceName - Reference to another device
437 * ( --- CoreSight specific extensions below ---)
438 * DirectionOfFlow - Integer 1 for output(master)
439 * 0 for input(slave)
440 * }
441 *
442 * e.g:
443 * For a Funnel device
444 *
445 * Device(MFUN) {
446 * ...
447 *
448 * Name (_DSD, Package() {
449 * // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
450 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
451 * Package() {
452 * Package(2) { "property-name", <property-value> }
453 * },
454 *
455 * ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
456 * Package() {
457 * 0, // Revision
458 * 1, // NumberOfGraphs.
459 * Package() { // Graph[0] Package
460 * 1, // GraphID
461 * // Coresight Graph UUID
462 * ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
463 * 3, // NumberOfLinks aka ports
464 * // Link[0]: Output_0 -> Replicator:Input_0
465 * Package () { 0, 0, \_SB_.RPL0, 1 },
466 * // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
467 * Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
468 * // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
469 * Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
470 * } // End of Graph[0] Package
471 *
472 * }, // End of ACPI Graph Property
473 * })
474 */
475static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
476{
477 int i, n;
478 const union acpi_object *rev, *nr_graphs;
479
480 /* The graph must contain at least the Revision and Number of Graphs */
481 if (graph->package.count < 2)
482 return false;
483
484 rev = &graph->package.elements[0];
485 nr_graphs = &graph->package.elements[1];
486
487 if (rev->type != ACPI_TYPE_INTEGER ||
488 nr_graphs->type != ACPI_TYPE_INTEGER)
489 return false;
490
491 /* We only support revision 0 */
492 if (rev->integer.value != 0)
493 return false;
494
495 n = nr_graphs->integer.value;
496 /* CoreSight devices are only part of a single Graph */
497 if (n != 1)
498 return false;
499
500 /* Make sure the ACPI graph package has right number of elements */
501 if (graph->package.count != (n + 2))
502 return false;
503
504 /*
505 * Each entry must be a graph package with at least 3 members :
506 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
507 */
508 for (i = 2; i < n + 2; i++) {
509 const union acpi_object *obj = &graph->package.elements[i];
510
511 if (obj->type != ACPI_TYPE_PACKAGE ||
512 obj->package.count < 3)
513 return false;
514 }
515
516 return true;
517}
518
519/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
520static const union acpi_object *
521acpi_get_dsd_graph(struct acpi_device *adev)
522{
523 int i;
524 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
525 acpi_status status;
526 const union acpi_object *dsd;
527
528 status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
529 &buf, ACPI_TYPE_PACKAGE);
530 if (ACPI_FAILURE(status))
531 return NULL;
532
533 dsd = buf.pointer;
534
535 /*
536 * _DSD property consists tuples { Prop_UUID, Package() }
537 * Iterate through all the packages and find the Graph.
538 */
539 for (i = 0; i + 1 < dsd->package.count; i += 2) {
540 const union acpi_object *guid, *package;
541
542 guid = &dsd->package.elements[i];
543 package = &dsd->package.elements[i + 1];
544
545 /* All _DSD elements must have a UUID and a Package */
546 if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
547 break;
548 /* Skip the non-Graph _DSD packages */
549 if (!is_acpi_dsd_graph_guid(guid))
550 continue;
551 if (acpi_validate_dsd_graph(package))
552 return package;
553 /* Invalid graph format, continue */
554 dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
555 }
556
557 return NULL;
558}
559
560static inline bool
561acpi_validate_coresight_graph(const union acpi_object *cs_graph)
562{
563 int nlinks;
564
565 nlinks = cs_graph->package.elements[2].integer.value;
566 /*
567 * Graph must have the following fields :
568 * { GraphID, GraphUUID, NumberOfLinks, Links... }
569 */
570 if (cs_graph->package.count != (nlinks + 3))
571 return false;
572 /* The links are validated in acpi_coresight_parse_link() */
573 return true;
574}
575
576/*
577 * acpi_get_coresight_graph - Parse the device _DSD tables and find
578 * the Graph property matching the CoreSight Graphs.
579 *
580 * Returns the pointer to the CoreSight Graph Package when found. Otherwise
581 * returns NULL.
582 */
583static const union acpi_object *
584acpi_get_coresight_graph(struct acpi_device *adev)
585{
586 const union acpi_object *graph_list, *graph;
587 int i, nr_graphs;
588
589 graph_list = acpi_get_dsd_graph(adev);
590 if (!graph_list)
591 return graph_list;
592
593 nr_graphs = graph_list->package.elements[1].integer.value;
594
595 for (i = 2; i < nr_graphs + 2; i++) {
596 graph = &graph_list->package.elements[i];
597 if (!is_acpi_coresight_graph(graph))
598 continue;
599 if (acpi_validate_coresight_graph(graph))
600 return graph;
601 /* Invalid graph format */
602 break;
603 }
604
605 return NULL;
606}
607
608/*
609 * acpi_coresight_parse_link - Parse the given Graph connection
610 * of the device and populate the coresight_connection for an output
611 * connection.
612 *
613 * CoreSight Graph specification mandates that the direction of the data
614 * flow must be specified in the link. i.e,
615 *
616 * SourcePortAddress, // Integer
617 * DestinationPortAddress, // Integer
618 * DestinationDeviceName, // Reference to another device
619 * DirectionOfFlow, // 1 for output(master), 0 for input(slave)
620 *
621 * Returns the direction of the data flow [ Input(slave) or Output(master) ]
622 * upon success.
623 * Returns an negative error number otherwise.
624 */
625static int acpi_coresight_parse_link(struct acpi_device *adev,
626 const union acpi_object *link,
627 struct coresight_connection *conn)
628{
629 int dir;
630 const union acpi_object *fields;
631 struct acpi_device *r_adev;
632 struct device *rdev;
633
634 if (link->type != ACPI_TYPE_PACKAGE ||
635 link->package.count != 4)
636 return -EINVAL;
637
638 fields = link->package.elements;
639
640 if (fields[0].type != ACPI_TYPE_INTEGER ||
641 fields[1].type != ACPI_TYPE_INTEGER ||
642 fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
643 fields[3].type != ACPI_TYPE_INTEGER)
644 return -EINVAL;
645
646 r_adev = acpi_fetch_acpi_dev(fields[2].reference.handle);
647 if (!r_adev)
648 return -ENODEV;
649
650 dir = fields[3].integer.value;
651 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
652 conn->outport = fields[0].integer.value;
653 conn->child_port = fields[1].integer.value;
654 rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
655 if (!rdev)
656 return -EPROBE_DEFER;
657 /*
658 * Hold the refcount to the target device. This could be
659 * released via:
660 * 1) coresight_release_platform_data() if the probe fails or
661 * this device is unregistered.
662 * 2) While removing the target device via
663 * coresight_remove_match().
664 */
665 conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
666 } else if (dir == ACPI_CORESIGHT_LINK_SLAVE) {
667 /*
668 * We are only interested in the port number
669 * for the input ports at this component.
670 * Store the port number in child_port.
671 */
672 conn->child_port = fields[0].integer.value;
673 } else {
674 /* Invalid direction */
675 return -EINVAL;
676 }
677
678 return dir;
679}
680
681/*
682 * acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
683 * connection information and populate the supplied coresight_platform_data
684 * instance.
685 */
686static int acpi_coresight_parse_graph(struct acpi_device *adev,
687 struct coresight_platform_data *pdata)
688{
689 int rc, i, nlinks;
690 const union acpi_object *graph;
691 struct coresight_connection *conns, *ptr;
692
693 pdata->nr_inport = pdata->nr_outport = 0;
694 graph = acpi_get_coresight_graph(adev);
695 if (!graph)
696 return -ENOENT;
697
698 nlinks = graph->package.elements[2].integer.value;
699 if (!nlinks)
700 return 0;
701
702 /*
703 * To avoid scanning the table twice (once for finding the number of
704 * output links and then later for parsing the output links),
705 * cache the links information in one go and then later copy
706 * it to the pdata.
707 */
708 conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
709 if (!conns)
710 return -ENOMEM;
711 ptr = conns;
712 for (i = 0; i < nlinks; i++) {
713 const union acpi_object *link = &graph->package.elements[3 + i];
714 int dir;
715
716 dir = acpi_coresight_parse_link(adev, link, ptr);
717 if (dir < 0)
718 return dir;
719
720 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
721 if (ptr->outport >= pdata->nr_outport)
722 pdata->nr_outport = ptr->outport + 1;
723 ptr++;
724 } else {
725 WARN_ON(pdata->nr_inport == ptr->child_port + 1);
726 /*
727 * We do not track input port connections for a device.
728 * However we need the highest port number described,
729 * which can be recorded now and reuse this connection
730 * record for an output connection. Hence, do not move
731 * the ptr for input connections
732 */
733 if (ptr->child_port >= pdata->nr_inport)
734 pdata->nr_inport = ptr->child_port + 1;
735 }
736 }
737
738 rc = coresight_alloc_conns(&adev->dev, pdata);
739 if (rc)
740 return rc;
741
742 /* Copy the connection information to the final location */
743 for (i = 0; conns + i < ptr; i++) {
744 int port = conns[i].outport;
745
746 /* Duplicate output port */
747 WARN_ON(pdata->conns[port].child_fwnode);
748 pdata->conns[port] = conns[i];
749 }
750
751 devm_kfree(&adev->dev, conns);
752 return 0;
753}
754
755/*
756 * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
757 * logical CPU id of the corresponding CPU device.
758 *
759 * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
760 */
761static int
762acpi_handle_to_logical_cpuid(acpi_handle handle)
763{
764 int i;
765 struct acpi_processor *pr;
766
767 for_each_possible_cpu(i) {
768 pr = per_cpu(processors, i);
769 if (pr && pr->handle == handle)
770 break;
771 }
772
773 return i;
774}
775
776/*
777 * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
778 * with this coresight device. With ACPI bindings, the CoreSight components
779 * are listed as child device of the associated CPU.
780 *
781 * Returns the logical CPU id when found. Otherwise returns 0.
782 */
783static int acpi_coresight_get_cpu(struct device *dev)
784{
785 int cpu;
786 acpi_handle cpu_handle;
787 acpi_status status;
788 struct acpi_device *adev = ACPI_COMPANION(dev);
789
790 if (!adev)
791 return -ENODEV;
792 status = acpi_get_parent(adev->handle, &cpu_handle);
793 if (ACPI_FAILURE(status))
794 return -ENODEV;
795
796 cpu = acpi_handle_to_logical_cpuid(cpu_handle);
797 if (cpu >= nr_cpu_ids)
798 return -ENODEV;
799 return cpu;
800}
801
802static int
803acpi_get_coresight_platform_data(struct device *dev,
804 struct coresight_platform_data *pdata)
805{
806 struct acpi_device *adev;
807
808 adev = ACPI_COMPANION(dev);
809 if (!adev)
810 return -EINVAL;
811
812 return acpi_coresight_parse_graph(adev, pdata);
813}
814
815#else
816
817static inline int
818acpi_get_coresight_platform_data(struct device *dev,
819 struct coresight_platform_data *pdata)
820{
821 return -ENOENT;
822}
823
824static inline int acpi_coresight_get_cpu(struct device *dev)
825{
826 return -ENODEV;
827}
828#endif
829
830int coresight_get_cpu(struct device *dev)
831{
832 if (is_of_node(dev->fwnode))
833 return of_coresight_get_cpu(dev);
834 else if (is_acpi_device_node(dev->fwnode))
835 return acpi_coresight_get_cpu(dev);
836 return 0;
837}
838EXPORT_SYMBOL_GPL(coresight_get_cpu);
839
840struct coresight_platform_data *
841coresight_get_platform_data(struct device *dev)
842{
843 int ret = -ENOENT;
844 struct coresight_platform_data *pdata = NULL;
845 struct fwnode_handle *fwnode = dev_fwnode(dev);
846
847 if (IS_ERR_OR_NULL(fwnode))
848 goto error;
849
850 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
851 if (!pdata) {
852 ret = -ENOMEM;
853 goto error;
854 }
855
856 if (is_of_node(fwnode))
857 ret = of_get_coresight_platform_data(dev, pdata);
858 else if (is_acpi_device_node(fwnode))
859 ret = acpi_get_coresight_platform_data(dev, pdata);
860
861 if (!ret)
862 return pdata;
863error:
864 if (!IS_ERR_OR_NULL(pdata))
865 /* Cleanup the connection information */
866 coresight_release_platform_data(NULL, pdata);
867 return ERR_PTR(ret);
868}
869EXPORT_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_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 for_each_endpoint_of_node()
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 for_each_endpoint_of_node(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 of_node_put(ep);
302 return ret;
303 }
304 }
305
306 return 0;
307}
308#else
309static inline int
310of_get_coresight_platform_data(struct device *dev,
311 struct coresight_platform_data *pdata)
312{
313 return -ENOENT;
314}
315
316static inline int of_coresight_get_cpu(struct device *dev)
317{
318 return -ENODEV;
319}
320#endif
321
322#ifdef CONFIG_ACPI
323
324#include <acpi/actypes.h>
325#include <acpi/processor.h>
326
327/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
328static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
329 0xbd, 0x68, 0xf7, 0xd3,
330 0x44, 0xef, 0x21, 0x53);
331/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
332static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
333 0x81, 0x07, 0xe6, 0x27,
334 0xf8, 0x05, 0xc6, 0xcd);
335#define ACPI_CORESIGHT_LINK_SLAVE 0
336#define ACPI_CORESIGHT_LINK_MASTER 1
337
338static inline bool is_acpi_guid(const union acpi_object *obj)
339{
340 return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
341}
342
343/*
344 * acpi_guid_matches - Checks if the given object is a GUID object and
345 * that it matches the supplied the GUID.
346 */
347static inline bool acpi_guid_matches(const union acpi_object *obj,
348 const guid_t *guid)
349{
350 return is_acpi_guid(obj) &&
351 guid_equal((guid_t *)obj->buffer.pointer, guid);
352}
353
354static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
355{
356 return acpi_guid_matches(obj, &acpi_graph_uuid);
357}
358
359static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
360{
361 return acpi_guid_matches(obj, &coresight_graph_uuid);
362}
363
364static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
365{
366 const union acpi_object *graphid, *guid, *links;
367
368 if (obj->type != ACPI_TYPE_PACKAGE ||
369 obj->package.count < 3)
370 return false;
371
372 graphid = &obj->package.elements[0];
373 guid = &obj->package.elements[1];
374 links = &obj->package.elements[2];
375
376 if (graphid->type != ACPI_TYPE_INTEGER ||
377 links->type != ACPI_TYPE_INTEGER)
378 return false;
379
380 return is_acpi_coresight_graph_guid(guid);
381}
382
383/*
384 * acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
385 * to the ACPI _DSD Graph specification.
386 *
387 * ACPI Devices Graph property has the following format:
388 * {
389 * Revision - Integer, must be 0
390 * NumberOfGraphs - Integer, N indicating the following list.
391 * Graph[1],
392 * ...
393 * Graph[N]
394 * }
395 *
396 * And each Graph entry has the following format:
397 * {
398 * GraphID - Integer, identifying a graph the device belongs to.
399 * UUID - UUID identifying the specification that governs
400 * this graph. (e.g, see is_acpi_coresight_graph())
401 * NumberOfLinks - Number "N" of connections on this node of the graph.
402 * Links[1]
403 * ...
404 * Links[N]
405 * }
406 *
407 * Where each "Links" entry has the following format:
408 *
409 * {
410 * SourcePortAddress - Integer
411 * DestinationPortAddress - Integer
412 * DestinationDeviceName - Reference to another device
413 * ( --- CoreSight specific extensions below ---)
414 * DirectionOfFlow - Integer 1 for output(master)
415 * 0 for input(slave)
416 * }
417 *
418 * e.g:
419 * For a Funnel device
420 *
421 * Device(MFUN) {
422 * ...
423 *
424 * Name (_DSD, Package() {
425 * // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
426 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
427 * Package() {
428 * Package(2) { "property-name", <property-value> }
429 * },
430 *
431 * ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
432 * Package() {
433 * 0, // Revision
434 * 1, // NumberOfGraphs.
435 * Package() { // Graph[0] Package
436 * 1, // GraphID
437 * // Coresight Graph UUID
438 * ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
439 * 3, // NumberOfLinks aka ports
440 * // Link[0]: Output_0 -> Replicator:Input_0
441 * Package () { 0, 0, \_SB_.RPL0, 1 },
442 * // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
443 * Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
444 * // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
445 * Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
446 * } // End of Graph[0] Package
447 *
448 * }, // End of ACPI Graph Property
449 * })
450 */
451static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
452{
453 int i, n;
454 const union acpi_object *rev, *nr_graphs;
455
456 /* The graph must contain at least the Revision and Number of Graphs */
457 if (graph->package.count < 2)
458 return false;
459
460 rev = &graph->package.elements[0];
461 nr_graphs = &graph->package.elements[1];
462
463 if (rev->type != ACPI_TYPE_INTEGER ||
464 nr_graphs->type != ACPI_TYPE_INTEGER)
465 return false;
466
467 /* We only support revision 0 */
468 if (rev->integer.value != 0)
469 return false;
470
471 n = nr_graphs->integer.value;
472 /* CoreSight devices are only part of a single Graph */
473 if (n != 1)
474 return false;
475
476 /* Make sure the ACPI graph package has right number of elements */
477 if (graph->package.count != (n + 2))
478 return false;
479
480 /*
481 * Each entry must be a graph package with at least 3 members :
482 * { GraphID, UUID, NumberOfLinks(n), Links[.],... }
483 */
484 for (i = 2; i < n + 2; i++) {
485 const union acpi_object *obj = &graph->package.elements[i];
486
487 if (obj->type != ACPI_TYPE_PACKAGE ||
488 obj->package.count < 3)
489 return false;
490 }
491
492 return true;
493}
494
495/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
496static const union acpi_object *
497acpi_get_dsd_graph(struct acpi_device *adev, struct acpi_buffer *buf)
498{
499 int i;
500 acpi_status status;
501 const union acpi_object *dsd;
502
503 status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
504 buf, ACPI_TYPE_PACKAGE);
505 if (ACPI_FAILURE(status))
506 return NULL;
507
508 dsd = buf->pointer;
509
510 /*
511 * _DSD property consists tuples { Prop_UUID, Package() }
512 * Iterate through all the packages and find the Graph.
513 */
514 for (i = 0; i + 1 < dsd->package.count; i += 2) {
515 const union acpi_object *guid, *package;
516
517 guid = &dsd->package.elements[i];
518 package = &dsd->package.elements[i + 1];
519
520 /* All _DSD elements must have a UUID and a Package */
521 if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
522 break;
523 /* Skip the non-Graph _DSD packages */
524 if (!is_acpi_dsd_graph_guid(guid))
525 continue;
526 if (acpi_validate_dsd_graph(package))
527 return package;
528 /* Invalid graph format, continue */
529 dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
530 }
531
532 return NULL;
533}
534
535static inline bool
536acpi_validate_coresight_graph(const union acpi_object *cs_graph)
537{
538 int nlinks;
539
540 nlinks = cs_graph->package.elements[2].integer.value;
541 /*
542 * Graph must have the following fields :
543 * { GraphID, GraphUUID, NumberOfLinks, Links... }
544 */
545 if (cs_graph->package.count != (nlinks + 3))
546 return false;
547 /* The links are validated in acpi_coresight_parse_link() */
548 return true;
549}
550
551/*
552 * acpi_get_coresight_graph - Parse the device _DSD tables and find
553 * the Graph property matching the CoreSight Graphs.
554 *
555 * Returns the pointer to the CoreSight Graph Package when found. Otherwise
556 * returns NULL.
557 */
558static const union acpi_object *
559acpi_get_coresight_graph(struct acpi_device *adev, struct acpi_buffer *buf)
560{
561 const union acpi_object *graph_list, *graph;
562 int i, nr_graphs;
563
564 graph_list = acpi_get_dsd_graph(adev, buf);
565 if (!graph_list)
566 return graph_list;
567
568 nr_graphs = graph_list->package.elements[1].integer.value;
569
570 for (i = 2; i < nr_graphs + 2; i++) {
571 graph = &graph_list->package.elements[i];
572 if (!is_acpi_coresight_graph(graph))
573 continue;
574 if (acpi_validate_coresight_graph(graph))
575 return graph;
576 /* Invalid graph format */
577 break;
578 }
579
580 return NULL;
581}
582
583/*
584 * acpi_coresight_parse_link - Parse the given Graph connection
585 * of the device and populate the coresight_connection for an output
586 * connection.
587 *
588 * CoreSight Graph specification mandates that the direction of the data
589 * flow must be specified in the link. i.e,
590 *
591 * SourcePortAddress, // Integer
592 * DestinationPortAddress, // Integer
593 * DestinationDeviceName, // Reference to another device
594 * DirectionOfFlow, // 1 for output(master), 0 for input(slave)
595 *
596 * Returns the direction of the data flow [ Input(slave) or Output(master) ]
597 * upon success.
598 * Returns an negative error number otherwise.
599 */
600static int acpi_coresight_parse_link(struct acpi_device *adev,
601 const union acpi_object *link,
602 struct coresight_connection *conn)
603{
604 int dir;
605 const union acpi_object *fields;
606 struct acpi_device *r_adev;
607 struct device *rdev;
608
609 if (link->type != ACPI_TYPE_PACKAGE ||
610 link->package.count != 4)
611 return -EINVAL;
612
613 fields = link->package.elements;
614
615 if (fields[0].type != ACPI_TYPE_INTEGER ||
616 fields[1].type != ACPI_TYPE_INTEGER ||
617 fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
618 fields[3].type != ACPI_TYPE_INTEGER)
619 return -EINVAL;
620
621 r_adev = acpi_fetch_acpi_dev(fields[2].reference.handle);
622 if (!r_adev)
623 return -ENODEV;
624
625 dir = fields[3].integer.value;
626 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
627 conn->src_port = fields[0].integer.value;
628 conn->dest_port = fields[1].integer.value;
629 rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
630 if (!rdev)
631 return -EPROBE_DEFER;
632 /*
633 * Hold the refcount to the target device. This could be
634 * released via:
635 * 1) coresight_release_platform_data() if the probe fails or
636 * this device is unregistered.
637 * 2) While removing the target device via
638 * coresight_remove_match().
639 */
640 conn->dest_fwnode = fwnode_handle_get(&r_adev->fwnode);
641 } else if (dir == ACPI_CORESIGHT_LINK_SLAVE) {
642 /*
643 * We are only interested in the port number
644 * for the input ports at this component.
645 * Store the port number in child_port.
646 */
647 conn->dest_port = fields[0].integer.value;
648 } else {
649 /* Invalid direction */
650 return -EINVAL;
651 }
652
653 return dir;
654}
655
656/*
657 * acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
658 * connection information and populate the supplied coresight_platform_data
659 * instance.
660 */
661static int acpi_coresight_parse_graph(struct device *dev,
662 struct acpi_device *adev,
663 struct coresight_platform_data *pdata)
664{
665 int ret = 0;
666 int i, nlinks;
667 const union acpi_object *graph;
668 struct coresight_connection conn, zero_conn = {};
669 struct coresight_connection *new_conn;
670 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
671
672 graph = acpi_get_coresight_graph(adev, &buf);
673 /*
674 * There are no graph connections, which is fine for some components.
675 * e.g., ETE
676 */
677 if (!graph)
678 goto free;
679
680 nlinks = graph->package.elements[2].integer.value;
681 if (!nlinks)
682 goto free;
683
684 for (i = 0; i < nlinks; i++) {
685 const union acpi_object *link = &graph->package.elements[3 + i];
686 int dir;
687
688 conn = zero_conn;
689 dir = acpi_coresight_parse_link(adev, link, &conn);
690 if (dir < 0) {
691 ret = dir;
692 goto free;
693 }
694
695 if (dir == ACPI_CORESIGHT_LINK_MASTER) {
696 new_conn = coresight_add_out_conn(dev, pdata, &conn);
697 if (IS_ERR(new_conn)) {
698 ret = PTR_ERR(new_conn);
699 goto free;
700 }
701 }
702 }
703
704free:
705 /*
706 * When ACPI fails to alloc a buffer, it will free the buffer
707 * created via ACPI_ALLOCATE_BUFFER and set to NULL.
708 * ACPI_FREE can handle NULL pointers, so free it directly.
709 */
710 ACPI_FREE(buf.pointer);
711 return ret;
712}
713
714/*
715 * acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
716 * logical CPU id of the corresponding CPU device.
717 *
718 * Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
719 */
720static int
721acpi_handle_to_logical_cpuid(acpi_handle handle)
722{
723 int i;
724 struct acpi_processor *pr;
725
726 for_each_possible_cpu(i) {
727 pr = per_cpu(processors, i);
728 if (pr && pr->handle == handle)
729 break;
730 }
731
732 return i;
733}
734
735/*
736 * acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
737 * with this coresight device. With ACPI bindings, the CoreSight components
738 * are listed as child device of the associated CPU.
739 *
740 * Returns the logical CPU id when found. Otherwise returns 0.
741 */
742static int acpi_coresight_get_cpu(struct device *dev)
743{
744 int cpu;
745 acpi_handle cpu_handle;
746 acpi_status status;
747 struct acpi_device *adev = ACPI_COMPANION(dev);
748
749 if (!adev)
750 return -ENODEV;
751 status = acpi_get_parent(adev->handle, &cpu_handle);
752 if (ACPI_FAILURE(status))
753 return -ENODEV;
754
755 cpu = acpi_handle_to_logical_cpuid(cpu_handle);
756 if (cpu >= nr_cpu_ids)
757 return -ENODEV;
758 return cpu;
759}
760
761static int
762acpi_get_coresight_platform_data(struct device *dev,
763 struct coresight_platform_data *pdata)
764{
765 struct acpi_device *adev;
766
767 adev = ACPI_COMPANION(dev);
768 if (!adev)
769 return -EINVAL;
770
771 return acpi_coresight_parse_graph(dev, adev, pdata);
772}
773
774#else
775
776static inline int
777acpi_get_coresight_platform_data(struct device *dev,
778 struct coresight_platform_data *pdata)
779{
780 return -ENOENT;
781}
782
783static inline int acpi_coresight_get_cpu(struct device *dev)
784{
785 return -ENODEV;
786}
787#endif
788
789int coresight_get_cpu(struct device *dev)
790{
791 if (is_of_node(dev->fwnode))
792 return of_coresight_get_cpu(dev);
793 else if (is_acpi_device_node(dev->fwnode))
794 return acpi_coresight_get_cpu(dev);
795 return 0;
796}
797EXPORT_SYMBOL_GPL(coresight_get_cpu);
798
799struct coresight_platform_data *
800coresight_get_platform_data(struct device *dev)
801{
802 int ret = -ENOENT;
803 struct coresight_platform_data *pdata = NULL;
804 struct fwnode_handle *fwnode = dev_fwnode(dev);
805
806 if (IS_ERR_OR_NULL(fwnode))
807 goto error;
808
809 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
810 if (!pdata) {
811 ret = -ENOMEM;
812 goto error;
813 }
814
815 if (is_of_node(fwnode))
816 ret = of_get_coresight_platform_data(dev, pdata);
817 else if (is_acpi_device_node(fwnode))
818 ret = acpi_get_coresight_platform_data(dev, pdata);
819
820 if (!ret)
821 return pdata;
822error:
823 if (!IS_ERR_OR_NULL(pdata))
824 /* Cleanup the connection information */
825 coresight_release_platform_data(NULL, dev, pdata);
826 return ERR_PTR(ret);
827}
828EXPORT_SYMBOL_GPL(coresight_get_platform_data);