summaryrefslogtreecommitdiffstats
path: root/drivers/thunderbolt/icm.c
blob: bdaac1ff00a5af7518da6e3e03a2c8e6ef99a11b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
/*
 * Internal Thunderbolt Connection Manager. This is a firmware running on
 * the Thunderbolt host controller performing most of the low-level
 * handling.
 *
 * Copyright (C) 2017, Intel Corporation
 * Authors: Michael Jamet <michael.jamet@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include "ctl.h"
#include "nhi_regs.h"
#include "tb.h"

#define PCIE2CIO_CMD			0x30
#define PCIE2CIO_CMD_TIMEOUT		BIT(31)
#define PCIE2CIO_CMD_START		BIT(30)
#define PCIE2CIO_CMD_WRITE		BIT(21)
#define PCIE2CIO_CMD_CS_MASK		GENMASK(20, 19)
#define PCIE2CIO_CMD_CS_SHIFT		19
#define PCIE2CIO_CMD_PORT_MASK		GENMASK(18, 13)
#define PCIE2CIO_CMD_PORT_SHIFT		13

#define PCIE2CIO_WRDATA			0x34
#define PCIE2CIO_RDDATA			0x38

#define PHY_PORT_CS1			0x37
#define PHY_PORT_CS1_LINK_DISABLE	BIT(14)
#define PHY_PORT_CS1_LINK_STATE_MASK	GENMASK(29, 26)
#define PHY_PORT_CS1_LINK_STATE_SHIFT	26

#define ICM_TIMEOUT			5000 /* ms */
#define ICM_MAX_LINK			4
#define ICM_MAX_DEPTH			6

/**
 * struct icm - Internal connection manager private data
 * @request_lock: Makes sure only one message is send to ICM at time
 * @rescan_work: Work used to rescan the surviving switches after resume
 * @upstream_port: Pointer to the PCIe upstream port this host
 *		   controller is connected. This is only set for systems
 *		   where ICM needs to be started manually
 * @vnd_cap: Vendor defined capability where PCIe2CIO mailbox resides
 *	     (only set when @upstream_port is not %NULL)
 * @safe_mode: ICM is in safe mode
 * @is_supported: Checks if we can support ICM on this controller
 * @get_mode: Read and return the ICM firmware mode (optional)
 * @get_route: Find a route string for given switch
 * @device_connected: Handle device connected ICM message
 * @device_disconnected: Handle device disconnected ICM message
 */
struct icm {
	struct mutex request_lock;
	struct delayed_work rescan_work;
	struct pci_dev *upstream_port;
	int vnd_cap;
	bool safe_mode;
	bool (*is_supported)(struct tb *tb);
	int (*get_mode)(struct tb *tb);
	int (*get_route)(struct tb *tb, u8 link, u8 depth, u64 *route);
	void (*device_connected)(struct tb *tb,
				 const struct icm_pkg_header *hdr);
	void (*device_disconnected)(struct tb *tb,
				    const struct icm_pkg_header *hdr);
};

struct icm_notification {
	struct work_struct work;
	struct icm_pkg_header *pkg;
	struct tb *tb;
};

static inline struct tb *icm_to_tb(struct icm *icm)
{
	return ((void *)icm - sizeof(struct tb));
}

static inline u8 phy_port_from_route(u64 route, u8 depth)
{
	return tb_switch_phy_port_from_link(route >> ((depth - 1) * 8));
}

static inline u8 dual_link_from_link(u8 link)
{
	return link ? ((link - 1) ^ 0x01) + 1 : 0;
}

static inline u64 get_route(u32 route_hi, u32 route_lo)
{
	return (u64)route_hi << 32 | route_lo;
}

static inline bool is_apple(void)
{
	return dmi_match(DMI_BOARD_VENDOR, "Apple Inc.");
}

static bool icm_match(const struct tb_cfg_request *req,
		      const struct ctl_pkg *pkg)
{
	const struct icm_pkg_header *res_hdr = pkg->buffer;
	const struct icm_pkg_header *req_hdr = req->request;

	if (pkg->frame.eof != req->response_type)
		return false;
	if (res_hdr->code != req_hdr->code)
		return false;

	return true;
}

static bool icm_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg)
{
	const struct icm_pkg_header *hdr = pkg->buffer;

	if (hdr->packet_id < req->npackets) {
		size_t offset = hdr->packet_id * req->response_size;

		memcpy(req->response + offset, pkg->buffer, req->response_size);
	}

	return hdr->packet_id == hdr->total_packets - 1;
}

static int icm_request(struct tb *tb, const void *request, size_t request_size,
		       void *response, size_t response_size, size_t npackets,
		       unsigned int timeout_msec)
{
	struct icm *icm = tb_priv(tb);
	int retries = 3;

	do {
		struct tb_cfg_request *req;
		struct tb_cfg_result res;

		req = tb_cfg_request_alloc();
		if (!req)
			return -ENOMEM;

		req->match = icm_match;
		req->copy = icm_copy;
		req->request = request;
		req->request_size = request_size;
		req->request_type = TB_CFG_PKG_ICM_CMD;
		req->response = response;
		req->npackets = npackets;
		req->response_size = response_size;
		req->response_type = TB_CFG_PKG_ICM_RESP;

		mutex_lock(&icm->request_lock);
		res = tb_cfg_request_sync(tb->ctl, req, timeout_msec);
		mutex_unlock(&icm->request_lock);

		tb_cfg_request_put(req);

		if (res.err != -ETIMEDOUT)
			return res.err == 1 ? -EIO : res.err;

		usleep_range(20, 50);
	} while (retries--);

	return -ETIMEDOUT;
}

static bool icm_fr_is_supported(struct tb *tb)
{
	return !is_apple();
}

static inline int icm_fr_get_switch_index(u32 port)
{
	int index;

	if ((port & ICM_PORT_TYPE_MASK) != TB_TYPE_PORT)
		return 0;

	index = port >> ICM_PORT_INDEX_SHIFT;
	return index != 0xff ? index : 0;
}

static int icm_fr_get_route(struct tb *tb, u8 link, u8 depth, u64 *route)
{
	struct icm_fr_pkg_get_topology_response *switches, *sw;
	struct icm_fr_pkg_get_topology request = {
		.hdr = { .code = ICM_GET_TOPOLOGY },
	};
	size_t npackets = ICM_GET_TOPOLOGY_PACKETS;
	int ret, index;
	u8 i;

	switches = kcalloc(npackets, sizeof(*switches), GFP_KERNEL);
	if (!switches)
		return -ENOMEM;

	ret = icm_request(tb, &request, sizeof(request), switches,
			  sizeof(*switches), npackets, ICM_TIMEOUT);
	if (ret)
		goto err_free;

	sw = &switches[0];
	index = icm_fr_get_switch_index(sw->ports[link]);
	if (!index) {
		ret = -ENODEV;
		goto err_free;
	}

	sw = &switches[index];
	for (i = 1; i < depth; i++) {
		unsigned int j;

		if (!(sw->first_data & ICM_SWITCH_USED)) {
			ret = -ENODEV;
			goto err_free;
		}

		for (j = 0; j < ARRAY_SIZE(sw->ports); j++) {
			index = icm_fr_get_switch_index(sw->ports[j]);
			if (index > sw->switch_index) {
				sw = &switches[index];
				break;
			}
		}
	}

	*route = get_route(sw->route_hi, sw->route_lo);

err_free:
	kfree(switches);
	return ret;
}

static int icm_fr_approve_switch(struct tb *tb, struct tb_switch *sw)
{
	struct icm_fr_pkg_approve_device request;
	struct icm_fr_pkg_approve_device reply;
	int ret;

	memset(&request, 0, sizeof(request));
	memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid));
	request.hdr.code = ICM_APPROVE_DEVICE;
	request.connection_id = sw->connection_id;
	request.connection_key = sw->connection_key;

	memset(&reply, 0, sizeof(reply));
	/* Use larger timeout as establishing tunnels can take some time */
	ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply),
			  1, 10000);
	if (ret)
		return ret;

	if (reply.hdr.flags & ICM_FLAGS_ERROR) {
		tb_warn(tb, "PCIe tunnel creation failed\n");
		return -EIO;
	}

	return 0;
}

static int icm_fr_add_switch_key(struct tb *tb, struct tb_switch *sw)
{
	struct icm_fr_pkg_add_device_key request;
	struct icm_fr_pkg_add_device_key_response reply;
	int ret;

	memset(&request, 0, sizeof(request));
	memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid));
	request.hdr.code = ICM_ADD_DEVICE_KEY;
	request.connection_id = sw->connection_id;
	request.connection_key = sw->connection_key;
	memcpy(request.key, sw->key, TB_SWITCH_KEY_SIZE);

	memset(&reply, 0, sizeof(reply));
	ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply),
			  1, ICM_TIMEOUT);
	if (ret)
		return ret;

	if (reply.hdr.flags & ICM_FLAGS_ERROR) {
		tb_warn(tb, "Adding key to switch failed\n");
		return -EIO;
	}

	return 0;
}

static int icm_fr_challenge_switch_key(struct tb *tb, struct tb_switch *sw,
				       const u8 *challenge, u8 *response)
{
	struct icm_fr_pkg_challenge_device request;
	struct icm_fr_pkg_challenge_device_response reply;
	int ret;

	memset(&request, 0, sizeof(request));
	memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid));
	request.hdr.code = ICM_CHALLENGE_DEVICE;
	request.connection_id = sw->connection_id;
	request.connection_key = sw->connection_key;
	memcpy(request.challenge, challenge, TB_SWITCH_KEY_SIZE);

	memset(&reply, 0, sizeof(reply));
	ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply),
			  1, ICM_TIMEOUT);
	if (ret)
		return ret;

	if (reply.hdr.flags & ICM_FLAGS_ERROR)
		return -EKEYREJECTED;
	if (reply.hdr.flags & ICM_FLAGS_NO_KEY)
		return -ENOKEY;

	memcpy(response, reply.response, TB_SWITCH_KEY_SIZE);

	return 0;
}

static void remove_switch(struct tb_switch *sw)
{
	struct tb_switch *parent_sw;

	parent_sw = tb_to_switch(sw->dev.parent);
	tb_port_at(tb_route(sw), parent_sw)->remote = NULL;
	tb_switch_remove(sw);
}

static void
icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr)
{
	const struct icm_fr_event_device_connected *pkg =
		(const struct icm_fr_event_device_connected *)hdr;
	struct tb_switch *sw, *parent_sw;
	struct icm *icm = tb_priv(tb);
	bool authorized = false;
	u8 link, depth;
	u64 route;
	int ret;

	link = pkg->link_info & ICM_LINK_INFO_LINK_MASK;
	depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >>
		ICM_LINK_INFO_DEPTH_SHIFT;
	authorized = pkg->link_info & ICM_LINK_INFO_APPROVED;

	ret = icm->get_route(tb, link, depth, &route);
	if (ret) {
		tb_err(tb, "failed to find route string for switch at %u.%u\n",
		       link, depth);
		return;
	}

	sw = tb_switch_find_by_uuid(tb, &pkg->ep_uuid);
	if (sw) {
		u8 phy_port, sw_phy_port;

		parent_sw = tb_to_switch(sw->dev.parent);
		sw_phy_port = phy_port_from_route(tb_route(sw), sw->depth);
		phy_port = phy_port_from_route(route, depth);

		/*
		 * On resume ICM will send us connected events for the
		 * devices that still are present. However, that
		 * information might have changed for example by the
		 * fact that a switch on a dual-link connection might
		 * have been enumerated using the other link now. Make
		 * sure our book keeping matches that.
		 */
		if (sw->depth == depth && sw_phy_port == phy_port &&
		    !!sw->authorized == authorized) {
			tb_port_at(tb_route(sw), parent_sw)->remote = NULL;
			tb_port_at(route, parent_sw)->remote =
				   tb_upstream_port(sw);
			sw->config.route_hi = upper_32_bits(route);
			sw->config.route_lo = lower_32_bits(route);
			sw->connection_id = pkg->connection_id;
			sw->connection_key = pkg->connection_key;
			sw->link = link;
			sw->depth = depth;
			sw->is_unplugged = false;
			tb_switch_put(sw);
			return;
		}

		/*
		 * User connected the same switch to another physical
		 * port or to another part of the topology. Remove the
		 * existing switch now before adding the new one.
		 */
		remove_switch(sw);
		tb_switch_put(sw);
	}

	/*
	 * If the switch was not found by UUID, look for a switch on
	 * same physical port (taking possible link aggregation into
	 * account) and depth. If we found one it is definitely a stale
	 * one so remove it first.
	 */
	sw = tb_switch_find_by_link_depth(tb, link, depth);
	if (!sw) {
		u8 dual_link;

		dual_link = dual_link_from_link(link);
		if (dual_link)
			sw = tb_switch_find_by_link_depth(tb, dual_link, depth);
	}
	if (sw) {
		remove_switch(sw);
		tb_switch_put(sw);
	}

	parent_sw = tb_switch_find_by_link_depth(tb, link, depth - 1);
	if (!parent_sw) {
		tb_err(tb, "failed to find parent switch for %u.%u\n",
		       link, depth);
		return;
	}

	sw = tb_switch_alloc(tb, &parent_sw->dev, route);
	if (!sw) {
		tb_switch_put(parent_sw);
		return;
	}

	sw->uuid = kmemdup(&pkg->ep_uuid, sizeof(pkg->ep_uuid), GFP_KERNEL);
	sw->connection_id = pkg->connection_id;
	sw->connection_key = pkg->connection_key;
	sw->link = link;
	sw->depth = depth;
	sw->authorized = authorized;
	sw->security_level = (pkg->hdr.flags & ICM_FLAGS_SLEVEL_MASK) >>
				ICM_FLAGS_SLEVEL_SHIFT;

	/* Link the two switches now */
	tb_port_at(route, parent_sw)->remote = tb_upstream_port(sw);
	tb_upstream_port(sw)->remote = tb_port_at(route, parent_sw);

	ret = tb_switch_add(sw);
	if (ret) {
		tb_port_at(tb_route(sw), parent_sw)->remote = NULL;
		tb_switch_put(sw);
	}
	tb_switch_put(parent_sw);
}

static void
icm_fr_device_disconnected(struct tb *tb, const struct icm_pkg_header *hdr)
{
	const struct icm_fr_event_device_disconnected *pkg =
		(const struct icm_fr_event_device_disconnected *)hdr;
	struct tb_switch *sw;
	u8 link, depth;

	link = pkg->link_info & ICM_LINK_INFO_LINK_MASK;
	depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >>
		ICM_LINK_INFO_DEPTH_SHIFT;

	if (link > ICM_MAX_LINK || depth > ICM_MAX_DEPTH) {
		tb_warn(tb, "invalid topology %u.%u, ignoring\n", link, depth);
		return;
	}

	sw = tb_switch_find_by_link_depth(tb, link, depth);
	if (!sw) {
		tb_warn(tb, "no switch exists at %u.%u, ignoring\n", link,
			depth);
		return;
	}

	remove_switch(sw);
	tb_switch_put(sw);
}

static struct pci_dev *get_upstream_port(struct pci_dev *pdev)
{
	struct pci_dev *parent;

	parent = pci_upstream_bridge(pdev);
	while (parent) {
		if (!pci_is_pcie(parent))
			return NULL;
		if (pci_pcie_type(parent) == PCI_EXP_TYPE_UPSTREAM)
			break;
		parent = pci_upstream_bridge(parent);
	}

	if (!parent)
		return NULL;

	switch (parent->device) {
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
		return parent;
	}

	return NULL;
}

static bool icm_ar_is_supported(struct tb *tb)
{
	struct pci_dev *upstream_port;
	struct icm *icm = tb_priv(tb);

	/*
	 * Starting from Alpine Ridge we can use ICM on Apple machines
	 * as well. We just need to reset and re-enable it first.
	 */
	if (!is_apple())
		return true;

	/*
	 * Find the upstream PCIe port in case we need to do reset
	 * through its vendor specific registers.
	 */
	upstream_port = get_upstream_port(tb->nhi->pdev);
	if (upstream_port) {
		int cap;

		cap = pci_find_ext_capability(upstream_port,
					      PCI_EXT_CAP_ID_VNDR);
		if (cap > 0) {
			icm->upstream_port = upstream_port;
			icm->vnd_cap = cap;

			return true;
		}
	}

	return false;
}

static int icm_ar_get_mode(struct tb *tb)
{
	struct tb_nhi *nhi = tb->nhi;
	int retries = 5;
	u32 val;

	do {
		val = ioread32(nhi->iobase + REG_FW_STS);
		if (val & REG_FW_STS_NVM_AUTH_DONE)
			break;
		msleep(30);
	} while (--retries);

	if (!retries) {
		dev_err(&nhi->pdev->dev, "ICM firmware not authenticated\n");
		return -ENODEV;
	}

	return nhi_mailbox_mode(nhi);
}

static int icm_ar_get_route(struct tb *tb, u8 link, u8 depth, u64 *route)
{
	struct icm_ar_pkg_get_route_response reply;
	struct icm_ar_pkg_get_route request = {
		.hdr = { .code = ICM_GET_ROUTE },
		.link_info = depth << ICM_LINK_INFO_DEPTH_SHIFT | link,
	};
	int ret;

	memset(&reply, 0, sizeof(reply));
	ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply),
			  1, ICM_TIMEOUT);
	if (ret)
		return ret;

	if (reply.hdr.flags & ICM_FLAGS_ERROR)
		return -EIO;

	*route = get_route(reply.route_hi, reply.route_lo);
	return 0;
}

static void icm_handle_notification(struct work_struct *work)
{
	struct icm_notification *n = container_of(work, typeof(*n), work);
	struct tb *tb = n->tb;
	struct icm *icm = tb_priv(tb);

	mutex_lock(&tb->lock);

	switch (n->pkg->code) {
	case ICM_EVENT_DEVICE_CONNECTED:
		icm->device_connected(tb, n->pkg);
		break;
	case ICM_EVENT_DEVICE_DISCONNECTED:
		icm->device_disconnected(tb, n->pkg);
		break;
	}

	mutex_unlock(&tb->lock);

	kfree(n->pkg);
	kfree(n);
}

static void icm_handle_event(struct tb *tb, enum tb_cfg_pkg_type type,
			     const void *buf, size_t size)
{
	struct icm_notification *n;

	n = kmalloc(sizeof(*n), GFP_KERNEL);
	if (!n)
		return;

	INIT_WORK(&n->work, icm_handle_notification);
	n->pkg = kmemdup(buf, size, GFP_KERNEL);
	n->tb = tb;

	queue_work(tb->wq, &n->work);
}

static int
__icm_driver_ready(struct tb *tb, enum tb_security_level *security_level)
{
	struct icm_pkg_driver_ready_response reply;
	struct icm_pkg_driver_ready request = {
		.hdr.code = ICM_DRIVER_READY,
	};
	unsigned int retries = 10;
	int ret;

	memset(&reply, 0, sizeof(reply));
	ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply),
			  1, ICM_TIMEOUT);
	if (ret)
		return ret;

	if (security_level)
		*security_level = reply.security_level & 0xf;

	/*
	 * Hold on here until the switch config space is accessible so
	 * that we can read root switch config successfully.
	 */
	do {
		struct tb_cfg_result res;
		u32 tmp;

		res = tb_cfg_read_raw(tb->ctl, &tmp, 0, 0, TB_CFG_SWITCH,
				      0, 1, 100);
		if (!res.err)
			return 0;

		msleep(50);
	} while (--retries);

	return -ETIMEDOUT;
}

static int pci2cio_wait_completion(struct icm *icm, unsigned long timeout_msec)
{
	unsigned long end = jiffies + msecs_to_jiffies(timeout_msec);
	u32 cmd;

	do {
		pci_read_config_dword(icm->upstream_port,
				      icm->vnd_cap + PCIE2CIO_CMD, &cmd);
		if (!(cmd & PCIE2CIO_CMD_START)) {
			if (cmd & PCIE2CIO_CMD_TIMEOUT)
				break;
			return 0;
		}

		msleep(50);
	} while (time_before(jiffies, end));

	return -ETIMEDOUT;
}

static int pcie2cio_read(struct icm *icm, enum tb_cfg_space cs,
			 unsigned int port, unsigned int index, u32 *data)
{
	struct pci_dev *pdev = icm->upstream_port;
	int ret, vnd_cap = icm->vnd_cap;
	u32 cmd;

	cmd = index;
	cmd |= (port << PCIE2CIO_CMD_PORT_SHIFT) & PCIE2CIO_CMD_PORT_MASK;
	cmd |= (cs << PCIE2CIO_CMD_CS_SHIFT) & PCIE2CIO_CMD_CS_MASK;
	cmd |= PCIE2CIO_CMD_START;
	pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_CMD, cmd);

	ret = pci2cio_wait_completion(icm, 5000);
	if (ret)
		return ret;

	pci_read_config_dword(pdev, vnd_cap + PCIE2CIO_RDDATA, data);
	return 0;
}

static int pcie2cio_write(struct icm *icm, enum tb_cfg_space cs,
			  unsigned int port, unsigned int index, u32 data)
{
	struct pci_dev *pdev = icm->upstream_port;
	int vnd_cap = icm->vnd_cap;
	u32 cmd;

	pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_WRDATA, data);

	cmd = index;
	cmd |= (port << PCIE2CIO_CMD_PORT_SHIFT) & PCIE2CIO_CMD_PORT_MASK;
	cmd |= (cs << PCIE2CIO_CMD_CS_SHIFT) & PCIE2CIO_CMD_CS_MASK;
	cmd |= PCIE2CIO_CMD_WRITE | PCIE2CIO_CMD_START;
	pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_CMD, cmd);

	return pci2cio_wait_completion(icm, 5000);
}

static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi)
{
	struct icm *icm = tb_priv(tb);
	u32 val;

	/* Put ARC to wait for CIO reset event to happen */
	val = ioread32(nhi->iobase + REG_FW_STS);
	val |= REG_FW_STS_CIO_RESET_REQ;
	iowrite32(val, nhi->iobase + REG_FW_STS);

	/* Re-start ARC */
	val = ioread32(nhi->iobase + REG_FW_STS);
	val |= REG_FW_STS_ICM_EN_INVERT;
	val |= REG_FW_STS_ICM_EN_CPU;
	iowrite32(val, nhi->iobase + REG_FW_STS);

	/* Trigger CIO reset now */
	return pcie2cio_write(icm, TB_CFG_SWITCH, 0, 0x50, BIT(9));
}

static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi)
{
	unsigned int retries = 10;
	int ret;
	u32 val;

	/* Check if the ICM firmware is already running */
	val = ioread32(nhi->iobase + REG_FW_STS);
	if (val & REG_FW_STS_ICM_EN)
		return 0;

	dev_info(&nhi->pdev->dev, "starting ICM firmware\n");

	ret = icm_firmware_reset(tb, nhi);
	if (ret)
		return ret;

	/* Wait until the ICM firmware tells us it is up and running */
	do {
		/* Check that the ICM firmware is running */
		val = ioread32(nhi->iobase + REG_FW_STS);
		if (val & REG_FW_STS_NVM_AUTH_DONE)
			return 0;

		msleep(300);
	} while (--retries);

	return -ETIMEDOUT;
}

static int icm_reset_phy_port(struct tb *tb, int phy_port)
{
	struct icm *icm = tb_priv(tb);
	u32 state0, state1;
	int port0, port1;
	u32 val0, val1;
	int ret;

	if (!icm->upstream_port)
		return 0;

	if (phy_port) {
		port0 = 3;
		port1 = 4;
	} else {
		port0 = 1;
		port1 = 2;
	}

	/*
	 * Read link status of both null ports belonging to a single
	 * physical port.
	 */
	ret = pcie2cio_read(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, &val0);
	if (ret)
		return ret;
	ret = pcie2cio_read(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, &val1);
	if (ret)
		return ret;

	state0 = val0 & PHY_PORT_CS1_LINK_STATE_MASK;
	state0 >>= PHY_PORT_CS1_LINK_STATE_SHIFT;
	state1 = val1 & PHY_PORT_CS1_LINK_STATE_MASK;
	state1 >>= PHY_PORT_CS1_LINK_STATE_SHIFT;

	/* If they are both up we need to reset them now */
	if (state0 != TB_PORT_UP || state1 != TB_PORT_UP)
		return 0;

	val0 |= PHY_PORT_CS1_LINK_DISABLE;
	ret = pcie2cio_write(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, val0);
	if (ret)
		return ret;

	val1 |= PHY_PORT_CS1_LINK_DISABLE;
	ret = pcie2cio_write(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, val1);
	if (ret)
		return ret;

	/* Wait a bit and then re-enable both ports */
	usleep_range(10, 100);

	ret = pcie2cio_read(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, &val0);
	if (ret)
		return ret;
	ret = pcie2cio_read(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, &val1);
	if (ret)
		return ret;

	val0 &= ~PHY_PORT_CS1_LINK_DISABLE;
	ret = pcie2cio_write(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, val0);
	if (ret)
		return ret;

	val1 &= ~PHY_PORT_CS1_LINK_DISABLE;
	return pcie2cio_write(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, val1);
}

static int icm_firmware_init(struct tb *tb)
{
	struct icm *icm = tb_priv(tb);
	struct tb_nhi *nhi = tb->nhi;
	int ret;

	ret = icm_firmware_start(tb, nhi);
	if (ret) {
		dev_err(&nhi->pdev->dev, "could not start ICM firmware\n");
		return ret;
	}

	if (icm->get_mode) {
		ret = icm->get_mode(tb);

		switch (ret) {
		case NHI_FW_SAFE_MODE:
			icm->safe_mode = true;
			break;

		case NHI_FW_CM_MODE:
			/* Ask ICM to accept all Thunderbolt devices */
			nhi_mailbox_cmd(nhi, NHI_MAILBOX_ALLOW_ALL_DEVS, 0);
			break;

		default:
			tb_err(tb, "ICM firmware is in wrong mode: %u\n", ret);
			return -ENODEV;
		}
	}

	/*
	 * Reset both physical ports if there is anything connected to
	 * them already.
	 */
	ret = icm_reset_phy_port(tb, 0);
	if (ret)
		dev_warn(&nhi->pdev->dev, "failed to reset links on port0\n");
	ret = icm_reset_phy_port(tb, 1);
	if (ret)
		dev_warn(&nhi->pdev->dev, "failed to reset links on port1\n");

	return 0;
}

static int icm_driver_ready(struct tb *tb)
{
	struct icm *icm = tb_priv(tb);
	int ret;

	ret = icm_firmware_init(tb);
	if (ret)
		return ret;

	if (icm->safe_mode) {
		tb_info(tb, "Thunderbolt host controller is in safe mode.\n");
		tb_info(tb, "You need to update NVM firmware of the controller before it can be used.\n");
		tb_info(tb, "For latest updates check https://thunderbolttechnology.net/updates.\n");
		return 0;
	}

	return __icm_driver_ready(tb, &tb->security_level);
}

static int icm_suspend(struct tb *tb)
{
	int ret;

	ret = nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_SAVE_DEVS, 0);
	if (ret)
		tb_info(tb, "Ignoring mailbox command error (%d) in %s\n",
			ret, __func__);

	return 0;
}

/*
 * Mark all switches (except root switch) below this one unplugged. ICM
 * firmware will send us an updated list of switches after we have send
 * it driver ready command. If a switch is not in that list it will be
 * removed when we perform rescan.
 */
static void icm_unplug_children(struct tb_switch *sw)
{
	unsigned int i;

	if (tb_route(sw))
		sw->is_unplugged = true;

	for (i = 1; i <= sw->config.max_port_number; i++) {
		struct tb_port *port = &sw->ports[i];

		if (tb_is_upstream_port(port))
			continue;
		if (!port->remote)
			continue;

		icm_unplug_children(port->remote->sw);
	}
}

static void icm_free_unplugged_children(struct tb_switch *sw)
{
	unsigned int i;

	for (i = 1; i <= sw->config.max_port_number; i++) {
		struct tb_port *port = &sw->ports[i];

		if (tb_is_upstream_port(port))
			continue;
		if (!port->remote)
			continue;

		if (port->remote->sw->is_unplugged) {
			tb_switch_remove(port->remote->sw);
			port->remote = NULL;
		} else {
			icm_free_unplugged_children(port->remote->sw);
		}
	}
}

static void icm_rescan_work(struct work_struct *work)
{
	struct icm *icm = container_of(work, struct icm, rescan_work.work);
	struct tb *tb = icm_to_tb(icm);

	mutex_lock(&tb->lock);
	if (tb->root_switch)
		icm_free_unplugged_children(tb->root_switch);
	mutex_unlock(&tb->lock);
}

static void icm_complete(struct tb *tb)
{
	struct icm *icm = tb_priv(tb);

	if (tb->nhi->going_away)
		return;

	icm_unplug_children(tb->root_switch);

	/*
	 * Now all existing children should be resumed, start events
	 * from ICM to get updated status.
	 */
	__icm_driver_ready(tb, NULL);

	/*
	 * We do not get notifications of devices that have been
	 * unplugged during suspend so schedule rescan to clean them up
	 * if any.
	 */
	queue_delayed_work(tb->wq, &icm->rescan_work, msecs_to_jiffies(500));
}

static int icm_start(struct tb *tb)
{
	struct icm *icm = tb_priv(tb);
	int ret;

	if (icm->safe_mode)
		tb->root_switch = tb_switch_alloc_safe_mode(tb, &tb->dev, 0);
	else
		tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0);
	if (!tb->root_switch)
		return -ENODEV;

	/*
	 * NVM upgrade has not been tested on Apple systems and they
	 * don't provide images publicly either. To be on the safe side
	 * prevent root switch NVM upgrade on Macs for now.
	 */
	tb->root_switch->no_nvm_upgrade = is_apple();

	ret = tb_switch_add(tb->root_switch);
	if (ret)
		tb_switch_put(tb->root_switch);

	return ret;
}

static void icm_stop(struct tb *tb)
{
	struct icm *icm = tb_priv(tb);

	cancel_delayed_work(&icm->rescan_work);
	tb_switch_remove(tb->root_switch);
	tb->root_switch = NULL;
	nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DRV_UNLOADS, 0);
}

static int icm_disconnect_pcie_paths(struct tb *tb)
{
	return nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DISCONNECT_PCIE_PATHS, 0);
}

/* Falcon Ridge and Alpine Ridge */
static const struct tb_cm_ops icm_fr_ops = {
	.driver_ready = icm_driver_ready,
	.start = icm_start,
	.stop = icm_stop,
	.suspend = icm_suspend,
	.complete = icm_complete,
	.handle_event = icm_handle_event,
	.approve_switch = icm_fr_approve_switch,
	.add_switch_key = icm_fr_add_switch_key,
	.challenge_switch_key = icm_fr_challenge_switch_key,
	.disconnect_pcie_paths = icm_disconnect_pcie_paths,
};

struct tb *icm_probe(struct tb_nhi *nhi)
{
	struct icm *icm;
	struct tb *tb;

	tb = tb_domain_alloc(nhi, sizeof(struct icm));
	if (!tb)
		return NULL;

	icm = tb_priv(tb);
	INIT_DELAYED_WORK(&icm->rescan_work, icm_rescan_work);
	mutex_init(&icm->request_lock);

	switch (nhi->pdev->device) {
	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI:
	case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI:
		icm->is_supported = icm_fr_is_supported;
		icm->get_route = icm_fr_get_route;
		icm->device_connected = icm_fr_device_connected;
		icm->device_disconnected = icm_fr_device_disconnected;
		tb->cm_ops = &icm_fr_ops;
		break;

	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI:
	case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI:
		icm->is_supported = icm_ar_is_supported;
		icm->get_mode = icm_ar_get_mode;
		icm->get_route = icm_ar_get_route;
		icm->device_connected = icm_fr_device_connected;
		icm->device_disconnected = icm_fr_device_disconnected;
		tb->cm_ops = &icm_fr_ops;
		break;
	}

	if (!icm->is_supported || !icm->is_supported(tb)) {
		dev_dbg(&nhi->pdev->dev, "ICM not supported on this controller\n");
		tb_domain_put(tb);
		return NULL;
	}

	return tb;
}