summaryrefslogtreecommitdiffstats
path: root/drivers/firmware/arm_ffa/driver.c
blob: 07b72c67924704aa41ce19df458dc5ad4c46a48b (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
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Arm Firmware Framework for ARMv8-A(FFA) interface driver
 *
 * The Arm FFA specification[1] describes a software architecture to
 * leverages the virtualization extension to isolate software images
 * provided by an ecosystem of vendors from each other and describes
 * interfaces that standardize communication between the various software
 * images including communication between images in the Secure world and
 * Normal world. Any Hypervisor could use the FFA interfaces to enable
 * communication between VMs it manages.
 *
 * The Hypervisor a.k.a Partition managers in FFA terminology can assign
 * system resources(Memory regions, Devices, CPU cycles) to the partitions
 * and manage isolation amongst them.
 *
 * [1] https://developer.arm.com/docs/den0077/latest
 *
 * Copyright (C) 2021 ARM Ltd.
 */

#define DRIVER_NAME "ARM FF-A"
#define pr_fmt(fmt) DRIVER_NAME ": " fmt

#include <linux/acpi.h>
#include <linux/arm_ffa.h>
#include <linux/bitfield.h>
#include <linux/cpuhotplug.h>
#include <linux/device.h>
#include <linux/hashtable.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/of_irq.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/uuid.h>
#include <linux/xarray.h>

#include "common.h"

#define FFA_DRIVER_VERSION	FFA_VERSION_1_1
#define FFA_MIN_VERSION		FFA_VERSION_1_0

#define SENDER_ID_MASK		GENMASK(31, 16)
#define RECEIVER_ID_MASK	GENMASK(15, 0)
#define SENDER_ID(x)		((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
#define RECEIVER_ID(x)		((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
#define PACK_TARGET_INFO(s, r)		\
	(FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))

/*
 * Keeping RX TX buffer size as 4K for now
 * 64K may be preferred to keep it min a page in 64K PAGE_SIZE config
 */
#define RXTX_BUFFER_SIZE	SZ_4K

#define FFA_MAX_NOTIFICATIONS		64

static ffa_fn *invoke_ffa_fn;

static const int ffa_linux_errmap[] = {
	/* better than switch case as long as return value is continuous */
	0,		/* FFA_RET_SUCCESS */
	-EOPNOTSUPP,	/* FFA_RET_NOT_SUPPORTED */
	-EINVAL,	/* FFA_RET_INVALID_PARAMETERS */
	-ENOMEM,	/* FFA_RET_NO_MEMORY */
	-EBUSY,		/* FFA_RET_BUSY */
	-EINTR,		/* FFA_RET_INTERRUPTED */
	-EACCES,	/* FFA_RET_DENIED */
	-EAGAIN,	/* FFA_RET_RETRY */
	-ECANCELED,	/* FFA_RET_ABORTED */
	-ENODATA,	/* FFA_RET_NO_DATA */
};

static inline int ffa_to_linux_errno(int errno)
{
	int err_idx = -errno;

	if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
		return ffa_linux_errmap[err_idx];
	return -EINVAL;
}

struct ffa_pcpu_irq {
	struct ffa_drv_info *info;
};

struct ffa_drv_info {
	u32 version;
	u16 vm_id;
	struct mutex rx_lock; /* lock to protect Rx buffer */
	struct mutex tx_lock; /* lock to protect Tx buffer */
	void *rx_buffer;
	void *tx_buffer;
	bool mem_ops_native;
	bool bitmap_created;
	unsigned int sched_recv_irq;
	unsigned int cpuhp_state;
	struct ffa_pcpu_irq __percpu *irq_pcpu;
	struct workqueue_struct *notif_pcpu_wq;
	struct work_struct notif_pcpu_work;
	struct work_struct irq_work;
	struct xarray partition_info;
	unsigned int partition_count;
	DECLARE_HASHTABLE(notifier_hash, ilog2(FFA_MAX_NOTIFICATIONS));
	struct mutex notify_lock; /* lock to protect notifier hashtable  */
};

static struct ffa_drv_info *drv_info;

/*
 * The driver must be able to support all the versions from the earliest
 * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
 * The specification states that if firmware supports a FFA implementation
 * that is incompatible with and at a greater version number than specified
 * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
 * it must return the NOT_SUPPORTED error code.
 */
static u32 ffa_compatible_version_find(u32 version)
{
	u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
	u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
	u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);

	if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
		return version;

	pr_info("Firmware version higher than driver version, downgrading\n");
	return FFA_DRIVER_VERSION;
}

static int ffa_version_check(u32 *version)
{
	ffa_value_t ver;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
		      }, &ver);

	if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
		pr_info("FFA_VERSION returned not supported\n");
		return -EOPNOTSUPP;
	}

	if (ver.a0 < FFA_MIN_VERSION) {
		pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
		       FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
		       FFA_MAJOR_VERSION(FFA_MIN_VERSION),
		       FFA_MINOR_VERSION(FFA_MIN_VERSION));
		return -EINVAL;
	}

	pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
		FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
	pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
		FFA_MINOR_VERSION(ver.a0));
	*version = ffa_compatible_version_find(ver.a0);

	return 0;
}

static int ffa_rx_release(void)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_RX_RELEASE,
		      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	/* check for ret.a0 == FFA_RX_RELEASE ? */

	return 0;
}

static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_FN_NATIVE(RXTX_MAP),
		      .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
		      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	return 0;
}

static int ffa_rxtx_unmap(u16 vm_id)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
		      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	return 0;
}

#define PARTITION_INFO_GET_RETURN_COUNT_ONLY	BIT(0)

/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
static int
__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
			 struct ffa_partition_info *buffer, int num_partitions)
{
	int idx, count, flags = 0, sz, buf_sz;
	ffa_value_t partition_info;

	if (drv_info->version > FFA_VERSION_1_0 &&
	    (!buffer || !num_partitions)) /* Just get the count for now */
		flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;

	mutex_lock(&drv_info->rx_lock);
	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_PARTITION_INFO_GET,
		      .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
		      .a5 = flags,
		      }, &partition_info);

	if (partition_info.a0 == FFA_ERROR) {
		mutex_unlock(&drv_info->rx_lock);
		return ffa_to_linux_errno((int)partition_info.a2);
	}

	count = partition_info.a2;

	if (drv_info->version > FFA_VERSION_1_0) {
		buf_sz = sz = partition_info.a3;
		if (sz > sizeof(*buffer))
			buf_sz = sizeof(*buffer);
	} else {
		/* FFA_VERSION_1_0 lacks size in the response */
		buf_sz = sz = 8;
	}

	if (buffer && count <= num_partitions)
		for (idx = 0; idx < count; idx++)
			memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
			       buf_sz);

	ffa_rx_release();

	mutex_unlock(&drv_info->rx_lock);

	return count;
}

/* buffer is allocated and caller must free the same if returned count > 0 */
static int
ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
{
	int count;
	u32 uuid0_4[4];
	struct ffa_partition_info *pbuf;

	export_uuid((u8 *)uuid0_4, uuid);
	count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
					 uuid0_4[3], NULL, 0);
	if (count <= 0)
		return count;

	pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
	if (!pbuf)
		return -ENOMEM;

	count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
					 uuid0_4[3], pbuf, count);
	if (count <= 0)
		kfree(pbuf);
	else
		*buffer = pbuf;

	return count;
}

#define VM_ID_MASK	GENMASK(15, 0)
static int ffa_id_get(u16 *vm_id)
{
	ffa_value_t id;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_ID_GET,
		      }, &id);

	if (id.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)id.a2);

	*vm_id = FIELD_GET(VM_ID_MASK, (id.a2));

	return 0;
}

static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
				   struct ffa_send_direct_data *data)
{
	u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
	ffa_value_t ret;

	if (mode_32bit) {
		req_id = FFA_MSG_SEND_DIRECT_REQ;
		resp_id = FFA_MSG_SEND_DIRECT_RESP;
	} else {
		req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
		resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
	}

	invoke_ffa_fn((ffa_value_t){
		      .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
		      .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
		      .a6 = data->data3, .a7 = data->data4,
		      }, &ret);

	while (ret.a0 == FFA_INTERRUPT)
		invoke_ffa_fn((ffa_value_t){
			      .a0 = FFA_RUN, .a1 = ret.a1,
			      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	if (ret.a0 == resp_id) {
		data->data0 = ret.a3;
		data->data1 = ret.a4;
		data->data2 = ret.a5;
		data->data3 = ret.a6;
		data->data4 = ret.a7;
		return 0;
	}

	return -EINVAL;
}

static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
			      u32 frag_len, u32 len, u64 *handle)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = func_id, .a1 = len, .a2 = frag_len,
		      .a3 = buf, .a4 = buf_sz,
		      }, &ret);

	while (ret.a0 == FFA_MEM_OP_PAUSE)
		invoke_ffa_fn((ffa_value_t){
			      .a0 = FFA_MEM_OP_RESUME,
			      .a1 = ret.a1, .a2 = ret.a2,
			      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	if (ret.a0 == FFA_SUCCESS) {
		if (handle)
			*handle = PACK_HANDLE(ret.a2, ret.a3);
	} else if (ret.a0 == FFA_MEM_FRAG_RX) {
		if (handle)
			*handle = PACK_HANDLE(ret.a1, ret.a2);
	} else {
		return -EOPNOTSUPP;
	}

	return frag_len;
}

static int ffa_mem_next_frag(u64 handle, u32 frag_len)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_MEM_FRAG_TX,
		      .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
		      .a3 = frag_len,
		      }, &ret);

	while (ret.a0 == FFA_MEM_OP_PAUSE)
		invoke_ffa_fn((ffa_value_t){
			      .a0 = FFA_MEM_OP_RESUME,
			      .a1 = ret.a1, .a2 = ret.a2,
			      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	if (ret.a0 == FFA_MEM_FRAG_RX)
		return ret.a3;
	else if (ret.a0 == FFA_SUCCESS)
		return 0;

	return -EOPNOTSUPP;
}

static int
ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
		      u32 len, u64 *handle, bool first)
{
	if (!first)
		return ffa_mem_next_frag(*handle, frag_len);

	return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
}

static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
{
	u32 num_pages = 0;

	do {
		num_pages += sg->length / FFA_PAGE_SIZE;
	} while ((sg = sg_next(sg)));

	return num_pages;
}

static u16 ffa_memory_attributes_get(u32 func_id)
{
	/*
	 * For the memory lend or donate operation, if the receiver is a PE or
	 * a proxy endpoint, the owner/sender must not specify the attributes
	 */
	if (func_id == FFA_FN_NATIVE(MEM_LEND) ||
	    func_id == FFA_MEM_LEND)
		return 0;

	return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE;
}

static int
ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
		       struct ffa_mem_ops_args *args)
{
	int rc = 0;
	bool first = true;
	u32 composite_offset;
	phys_addr_t addr = 0;
	struct ffa_mem_region *mem_region = buffer;
	struct ffa_composite_mem_region *composite;
	struct ffa_mem_region_addr_range *constituents;
	struct ffa_mem_region_attributes *ep_mem_access;
	u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);

	mem_region->tag = args->tag;
	mem_region->flags = args->flags;
	mem_region->sender_id = drv_info->vm_id;
	mem_region->attributes = ffa_memory_attributes_get(func_id);
	ep_mem_access = buffer +
			ffa_mem_desc_offset(buffer, 0, drv_info->version);
	composite_offset = ffa_mem_desc_offset(buffer, args->nattrs,
					       drv_info->version);

	for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
		ep_mem_access->receiver = args->attrs[idx].receiver;
		ep_mem_access->attrs = args->attrs[idx].attrs;
		ep_mem_access->composite_off = composite_offset;
		ep_mem_access->flag = 0;
		ep_mem_access->reserved = 0;
	}
	mem_region->handle = 0;
	mem_region->ep_count = args->nattrs;
	if (drv_info->version <= FFA_VERSION_1_0) {
		mem_region->ep_mem_size = 0;
	} else {
		mem_region->ep_mem_size = sizeof(*ep_mem_access);
		mem_region->ep_mem_offset = sizeof(*mem_region);
		memset(mem_region->reserved, 0, 12);
	}

	composite = buffer + composite_offset;
	composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
	composite->addr_range_cnt = num_entries;
	composite->reserved = 0;

	length = composite_offset + CONSTITUENTS_OFFSET(num_entries);
	frag_len = composite_offset + CONSTITUENTS_OFFSET(0);
	if (frag_len > max_fragsize)
		return -ENXIO;

	if (!args->use_txbuf) {
		addr = virt_to_phys(buffer);
		buf_sz = max_fragsize / FFA_PAGE_SIZE;
	}

	constituents = buffer + frag_len;
	idx = 0;
	do {
		if (frag_len == max_fragsize) {
			rc = ffa_transmit_fragment(func_id, addr, buf_sz,
						   frag_len, length,
						   &args->g_handle, first);
			if (rc < 0)
				return -ENXIO;

			first = false;
			idx = 0;
			frag_len = 0;
			constituents = buffer;
		}

		if ((void *)constituents - buffer > max_fragsize) {
			pr_err("Memory Region Fragment > Tx Buffer size\n");
			return -EFAULT;
		}

		constituents->address = sg_phys(args->sg);
		constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
		constituents->reserved = 0;
		constituents++;
		frag_len += sizeof(struct ffa_mem_region_addr_range);
	} while ((args->sg = sg_next(args->sg)));

	return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
				     length, &args->g_handle, first);
}

static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
{
	int ret;
	void *buffer;

	if (!args->use_txbuf) {
		buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
		if (!buffer)
			return -ENOMEM;
	} else {
		buffer = drv_info->tx_buffer;
		mutex_lock(&drv_info->tx_lock);
	}

	ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);

	if (args->use_txbuf)
		mutex_unlock(&drv_info->tx_lock);
	else
		free_pages_exact(buffer, RXTX_BUFFER_SIZE);

	return ret < 0 ? ret : 0;
}

static int ffa_memory_reclaim(u64 g_handle, u32 flags)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_MEM_RECLAIM,
		      .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
		      .a3 = flags,
		      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	return 0;
}

static int ffa_features(u32 func_feat_id, u32 input_props,
			u32 *if_props_1, u32 *if_props_2)
{
	ffa_value_t id;

	if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
		pr_err("%s: Invalid Parameters: %x, %x", __func__,
		       func_feat_id, input_props);
		return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
	}

	invoke_ffa_fn((ffa_value_t){
		.a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
		}, &id);

	if (id.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)id.a2);

	if (if_props_1)
		*if_props_1 = id.a2;
	if (if_props_2)
		*if_props_2 = id.a3;

	return 0;
}

static int ffa_notification_bitmap_create(void)
{
	ffa_value_t ret;
	u16 vcpu_count = nr_cpu_ids;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_NOTIFICATION_BITMAP_CREATE,
		      .a1 = drv_info->vm_id, .a2 = vcpu_count,
		      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	return 0;
}

static int ffa_notification_bitmap_destroy(void)
{
	ffa_value_t ret;

	invoke_ffa_fn((ffa_value_t){
		      .a0 = FFA_NOTIFICATION_BITMAP_DESTROY,
		      .a1 = drv_info->vm_id,
		      }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	return 0;
}

#define NOTIFICATION_LOW_MASK		GENMASK(31, 0)
#define NOTIFICATION_HIGH_MASK		GENMASK(63, 32)
#define NOTIFICATION_BITMAP_HIGH(x)	\
		((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
#define NOTIFICATION_BITMAP_LOW(x)	\
		((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
#define PACK_NOTIFICATION_BITMAP(low, high)	\
	(FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
	 FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))

#define RECEIVER_VCPU_MASK		GENMASK(31, 16)
#define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
	(FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
	 FIELD_PREP(RECEIVER_ID_MASK, (r)))

#define NOTIFICATION_INFO_GET_MORE_PEND_MASK	BIT(0)
#define NOTIFICATION_INFO_GET_ID_COUNT		GENMASK(11, 7)
#define ID_LIST_MASK_64				GENMASK(51, 12)
#define ID_LIST_MASK_32				GENMASK(31, 12)
#define MAX_IDS_64				20
#define MAX_IDS_32				10

#define PER_VCPU_NOTIFICATION_FLAG		BIT(0)
#define SECURE_PARTITION_BITMAP			BIT(0)
#define NON_SECURE_VM_BITMAP			BIT(1)
#define SPM_FRAMEWORK_BITMAP			BIT(2)
#define NS_HYP_FRAMEWORK_BITMAP			BIT(3)

static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
					u32 flags, bool is_bind)
{
	ffa_value_t ret;
	u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);

	func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;

	invoke_ffa_fn((ffa_value_t){
		  .a0 = func, .a1 = src_dst_ids, .a2 = flags,
		  .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
		  .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
		  }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);
	else if (ret.a0 != FFA_SUCCESS)
		return -EINVAL;

	return 0;
}

static
int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
{
	ffa_value_t ret;
	u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id);

	invoke_ffa_fn((ffa_value_t) {
		  .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags,
		  .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
		  .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
		  }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);
	else if (ret.a0 != FFA_SUCCESS)
		return -EINVAL;

	return 0;
}

struct ffa_notify_bitmaps {
	u64 sp_map;
	u64 vm_map;
	u64 arch_map;
};

static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
{
	ffa_value_t ret;
	u16 src_id = drv_info->vm_id;
	u16 cpu_id = smp_processor_id();
	u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);

	invoke_ffa_fn((ffa_value_t){
		  .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
		  }, &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);
	else if (ret.a0 != FFA_SUCCESS)
		return -EINVAL; /* Something else went wrong. */

	notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
	notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
	notify->arch_map = PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7);

	return 0;
}

struct ffa_dev_part_info {
	ffa_sched_recv_cb callback;
	void *cb_data;
	rwlock_t rw_lock;
};

static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
{
	struct ffa_dev_part_info *partition;
	ffa_sched_recv_cb callback;
	void *cb_data;

	partition = xa_load(&drv_info->partition_info, part_id);
	read_lock(&partition->rw_lock);
	callback = partition->callback;
	cb_data = partition->cb_data;
	read_unlock(&partition->rw_lock);

	if (callback)
		callback(vcpu, is_per_vcpu, cb_data);
}

static void ffa_notification_info_get(void)
{
	int idx, list, max_ids, lists_cnt, ids_processed, ids_count[MAX_IDS_64];
	bool is_64b_resp;
	ffa_value_t ret;
	u64 id_list;

	do {
		invoke_ffa_fn((ffa_value_t){
			  .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET),
			  }, &ret);

		if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) {
			if (ret.a2 != FFA_RET_NO_DATA)
				pr_err("Notification Info fetch failed: 0x%lx (0x%lx)",
				       ret.a0, ret.a2);
			return;
		}

		is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS);

		ids_processed = 0;
		lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2);
		if (is_64b_resp) {
			max_ids = MAX_IDS_64;
			id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2);
		} else {
			max_ids = MAX_IDS_32;
			id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2);
		}

		for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2)
			ids_count[idx] = (id_list & 0x3) + 1;

		/* Process IDs */
		for (list = 0; list < lists_cnt; list++) {
			u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3;

			if (ids_processed >= max_ids - 1)
				break;

			part_id = packed_id_list[++ids_processed];

			if (!ids_count[list]) { /* Global Notification */
				__do_sched_recv_cb(part_id, 0, false);
				continue;
			}

			/* Per vCPU Notification */
			for (idx = 0; idx < ids_count[list]; idx++) {
				if (ids_processed >= max_ids - 1)
					break;

				vcpu_id = packed_id_list[++ids_processed];

				__do_sched_recv_cb(part_id, vcpu_id, true);
			}
		}
	} while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK);
}

static int ffa_run(struct ffa_device *dev, u16 vcpu)
{
	ffa_value_t ret;
	u32 target = dev->vm_id << 16 | vcpu;

	invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret);

	while (ret.a0 == FFA_INTERRUPT)
		invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, },
			      &ret);

	if (ret.a0 == FFA_ERROR)
		return ffa_to_linux_errno((int)ret.a2);

	return 0;
}

static void ffa_set_up_mem_ops_native_flag(void)
{
	if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
	    !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
		drv_info->mem_ops_native = true;
}

static u32 ffa_api_version_get(void)
{
	return drv_info->version;
}

static int ffa_partition_info_get(const char *uuid_str,
				  struct ffa_partition_info *buffer)
{
	int count;
	uuid_t uuid;
	struct ffa_partition_info *pbuf;

	if (uuid_parse(uuid_str, &uuid)) {
		pr_err("invalid uuid (%s)\n", uuid_str);
		return -ENODEV;
	}

	count = ffa_partition_probe(&uuid, &pbuf);
	if (count <= 0)
		return -ENOENT;

	memcpy(buffer, pbuf, sizeof(*pbuf) * count);
	kfree(pbuf);
	return 0;
}

static void ffa_mode_32bit_set(struct ffa_device *dev)
{
	dev->mode_32bit = true;
}

static int ffa_sync_send_receive(struct ffa_device *dev,
				 struct ffa_send_direct_data *data)
{
	return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
				       dev->mode_32bit, data);
}

static int ffa_memory_share(struct ffa_mem_ops_args *args)
{
	if (drv_info->mem_ops_native)
		return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);

	return ffa_memory_ops(FFA_MEM_SHARE, args);
}

static int ffa_memory_lend(struct ffa_mem_ops_args *args)
{
	/* Note that upon a successful MEM_LEND request the caller
	 * must ensure that the memory region specified is not accessed
	 * until a successful MEM_RECALIM call has been made.
	 * On systems with a hypervisor present this will been enforced,
	 * however on systems without a hypervisor the responsibility
	 * falls to the calling kernel driver to prevent access.
	 */
	if (drv_info->mem_ops_native)
		return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);

	return ffa_memory_ops(FFA_MEM_LEND, args);
}

#define FFA_SECURE_PARTITION_ID_FLAG	BIT(15)

enum notify_type {
	NON_SECURE_VM,
	SECURE_PARTITION,
	FRAMEWORK,
};

struct notifier_cb_info {
	struct hlist_node hnode;
	ffa_notifier_cb cb;
	void *cb_data;
	enum notify_type type;
};

static int ffa_sched_recv_cb_update(u16 part_id, ffa_sched_recv_cb callback,
				    void *cb_data, bool is_registration)
{
	struct ffa_dev_part_info *partition;
	bool cb_valid;

	partition = xa_load(&drv_info->partition_info, part_id);
	write_lock(&partition->rw_lock);

	cb_valid = !!partition->callback;
	if (!(is_registration ^ cb_valid)) {
		write_unlock(&partition->rw_lock);
		return -EINVAL;
	}

	partition->callback = callback;
	partition->cb_data = cb_data;

	write_unlock(&partition->rw_lock);
	return 0;
}

static int ffa_sched_recv_cb_register(struct ffa_device *dev,
				      ffa_sched_recv_cb cb, void *cb_data)
{
	return ffa_sched_recv_cb_update(dev->vm_id, cb, cb_data, true);
}

static int ffa_sched_recv_cb_unregister(struct ffa_device *dev)
{
	return ffa_sched_recv_cb_update(dev->vm_id, NULL, NULL, false);
}

static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags)
{
	return ffa_notification_bind_common(dst_id, bitmap, flags, true);
}

static int ffa_notification_unbind(u16 dst_id, u64 bitmap)
{
	return ffa_notification_bind_common(dst_id, bitmap, 0, false);
}

/* Should be called while the notify_lock is taken */
static struct notifier_cb_info *
notifier_hash_node_get(u16 notify_id, enum notify_type type)
{
	struct notifier_cb_info *node;

	hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
		if (type == node->type)
			return node;

	return NULL;
}

static int
update_notifier_cb(int notify_id, enum notify_type type, ffa_notifier_cb cb,
		   void *cb_data, bool is_registration)
{
	struct notifier_cb_info *cb_info = NULL;
	bool cb_found;

	cb_info = notifier_hash_node_get(notify_id, type);
	cb_found = !!cb_info;

	if (!(is_registration ^ cb_found))
		return -EINVAL;

	if (is_registration) {
		cb_info = kzalloc(sizeof(*cb_info), GFP_KERNEL);
		if (!cb_info)
			return -ENOMEM;

		cb_info->type = type;
		cb_info->cb = cb;
		cb_info->cb_data = cb_data;

		hash_add(drv_info->notifier_hash, &cb_info->hnode, notify_id);
	} else {
		hash_del(&cb_info->hnode);
	}

	return 0;
}

static enum notify_type ffa_notify_type_get(u16 vm_id)
{
	if (vm_id & FFA_SECURE_PARTITION_ID_FLAG)
		return SECURE_PARTITION;
	else
		return NON_SECURE_VM;
}

static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id)
{
	int rc;
	enum notify_type type = ffa_notify_type_get(dev->vm_id);

	if (notify_id >= FFA_MAX_NOTIFICATIONS)
		return -EINVAL;

	mutex_lock(&drv_info->notify_lock);

	rc = update_notifier_cb(notify_id, type, NULL, NULL, false);
	if (rc) {
		pr_err("Could not unregister notification callback\n");
		mutex_unlock(&drv_info->notify_lock);
		return rc;
	}

	rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id));

	mutex_unlock(&drv_info->notify_lock);

	return rc;
}

static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
			      ffa_notifier_cb cb, void *cb_data, int notify_id)
{
	int rc;
	u32 flags = 0;
	enum notify_type type = ffa_notify_type_get(dev->vm_id);

	if (notify_id >= FFA_MAX_NOTIFICATIONS)
		return -EINVAL;

	mutex_lock(&drv_info->notify_lock);

	if (is_per_vcpu)
		flags = PER_VCPU_NOTIFICATION_FLAG;

	rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags);
	if (rc) {
		mutex_unlock(&drv_info->notify_lock);
		return rc;
	}

	rc = update_notifier_cb(notify_id, type, cb, cb_data, true);
	if (rc) {
		pr_err("Failed to register callback for %d - %d\n",
		       notify_id, rc);
		ffa_notification_unbind(dev->vm_id, BIT(notify_id));
	}
	mutex_unlock(&drv_info->notify_lock);

	return rc;
}

static int ffa_notify_send(struct ffa_device *dev, int notify_id,
			   bool is_per_vcpu, u16 vcpu)
{
	u32 flags = 0;

	if (is_per_vcpu)
		flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16);

	return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags,
				    BIT(notify_id));
}

static void handle_notif_callbacks(u64 bitmap, enum notify_type type)
{
	int notify_id;
	struct notifier_cb_info *cb_info = NULL;

	for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap;
	     notify_id++, bitmap >>= 1) {
		if (!(bitmap & 1))
			continue;

		mutex_lock(&drv_info->notify_lock);
		cb_info = notifier_hash_node_get(notify_id, type);
		mutex_unlock(&drv_info->notify_lock);

		if (cb_info && cb_info->cb)
			cb_info->cb(notify_id, cb_info->cb_data);
	}
}

static void notif_pcpu_irq_work_fn(struct work_struct *work)
{
	int rc;
	struct ffa_notify_bitmaps bitmaps;

	rc = ffa_notification_get(SECURE_PARTITION_BITMAP |
				  SPM_FRAMEWORK_BITMAP, &bitmaps);
	if (rc) {
		pr_err("Failed to retrieve notifications with %d!\n", rc);
		return;
	}

	handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM);
	handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION);
	handle_notif_callbacks(bitmaps.arch_map, FRAMEWORK);
}

static void
ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data)
{
	struct ffa_drv_info *info = cb_data;

	if (!is_per_vcpu)
		notif_pcpu_irq_work_fn(&info->notif_pcpu_work);
	else
		queue_work_on(vcpu, info->notif_pcpu_wq,
			      &info->notif_pcpu_work);
}

static const struct ffa_info_ops ffa_drv_info_ops = {
	.api_version_get = ffa_api_version_get,
	.partition_info_get = ffa_partition_info_get,
};

static const struct ffa_msg_ops ffa_drv_msg_ops = {
	.mode_32bit_set = ffa_mode_32bit_set,
	.sync_send_receive = ffa_sync_send_receive,
};

static const struct ffa_mem_ops ffa_drv_mem_ops = {
	.memory_reclaim = ffa_memory_reclaim,
	.memory_share = ffa_memory_share,
	.memory_lend = ffa_memory_lend,
};

static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
	.run = ffa_run,
};

static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
	.sched_recv_cb_register = ffa_sched_recv_cb_register,
	.sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
	.notify_request = ffa_notify_request,
	.notify_relinquish = ffa_notify_relinquish,
	.notify_send = ffa_notify_send,
};

static const struct ffa_ops ffa_drv_ops = {
	.info_ops = &ffa_drv_info_ops,
	.msg_ops = &ffa_drv_msg_ops,
	.mem_ops = &ffa_drv_mem_ops,
	.cpu_ops = &ffa_drv_cpu_ops,
	.notifier_ops = &ffa_drv_notifier_ops,
};

void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
{
	int count, idx;
	struct ffa_partition_info *pbuf, *tpbuf;

	/*
	 * FF-A v1.1 provides UUID for each partition as part of the discovery
	 * API, the discovered UUID must be populated in the device's UUID and
	 * there is no need to copy the same from the driver table.
	 */
	if (drv_info->version > FFA_VERSION_1_0)
		return;

	count = ffa_partition_probe(uuid, &pbuf);
	if (count <= 0)
		return;

	for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
		if (tpbuf->id == ffa_dev->vm_id)
			uuid_copy(&ffa_dev->uuid, uuid);
	kfree(pbuf);
}

static void ffa_setup_partitions(void)
{
	int count, idx;
	uuid_t uuid;
	struct ffa_device *ffa_dev;
	struct ffa_dev_part_info *info;
	struct ffa_partition_info *pbuf, *tpbuf;

	count = ffa_partition_probe(&uuid_null, &pbuf);
	if (count <= 0) {
		pr_info("%s: No partitions found, error %d\n", __func__, count);
		return;
	}

	xa_init(&drv_info->partition_info);
	for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
		import_uuid(&uuid, (u8 *)tpbuf->uuid);

		/* Note that if the UUID will be uuid_null, that will require
		 * ffa_device_match() to find the UUID of this partition id
		 * with help of ffa_device_match_uuid(). FF-A v1.1 and above
		 * provides UUID here for each partition as part of the
		 * discovery API and the same is passed.
		 */
		ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
		if (!ffa_dev) {
			pr_err("%s: failed to register partition ID 0x%x\n",
			       __func__, tpbuf->id);
			continue;
		}

		if (drv_info->version > FFA_VERSION_1_0 &&
		    !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
			ffa_mode_32bit_set(ffa_dev);

		info = kzalloc(sizeof(*info), GFP_KERNEL);
		if (!info) {
			ffa_device_unregister(ffa_dev);
			continue;
		}
		xa_store(&drv_info->partition_info, tpbuf->id, info, GFP_KERNEL);
	}
	drv_info->partition_count = count;

	kfree(pbuf);

	/* Allocate for the host */
	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return;
	xa_store(&drv_info->partition_info, drv_info->vm_id, info, GFP_KERNEL);
	drv_info->partition_count++;
}

static void ffa_partitions_cleanup(void)
{
	struct ffa_dev_part_info **info;
	int idx, count = drv_info->partition_count;

	if (!count)
		return;

	info = kcalloc(count, sizeof(**info), GFP_KERNEL);
	if (!info)
		return;

	xa_extract(&drv_info->partition_info, (void **)info, 0, VM_ID_MASK,
		   count, XA_PRESENT);

	for (idx = 0; idx < count; idx++)
		kfree(info[idx]);
	kfree(info);

	drv_info->partition_count = 0;
	xa_destroy(&drv_info->partition_info);
}

/* FFA FEATURE IDs */
#define FFA_FEAT_NOTIFICATION_PENDING_INT	(1)
#define FFA_FEAT_SCHEDULE_RECEIVER_INT		(2)
#define FFA_FEAT_MANAGED_EXIT_INT		(3)

static irqreturn_t irq_handler(int irq, void *irq_data)
{
	struct ffa_pcpu_irq *pcpu = irq_data;
	struct ffa_drv_info *info = pcpu->info;

	queue_work(info->notif_pcpu_wq, &info->irq_work);

	return IRQ_HANDLED;
}

static void ffa_sched_recv_irq_work_fn(struct work_struct *work)
{
	ffa_notification_info_get();
}

static int ffa_sched_recv_irq_map(void)
{
	int ret, irq, sr_intid;

	/* The returned sr_intid is assumed to be SGI donated to NS world */
	ret = ffa_features(FFA_FEAT_SCHEDULE_RECEIVER_INT, 0, &sr_intid, NULL);
	if (ret < 0) {
		if (ret != -EOPNOTSUPP)
			pr_err("Failed to retrieve scheduler Rx interrupt\n");
		return ret;
	}

	if (acpi_disabled) {
		struct of_phandle_args oirq = {};
		struct device_node *gic;

		/* Only GICv3 supported currently with the device tree */
		gic = of_find_compatible_node(NULL, NULL, "arm,gic-v3");
		if (!gic)
			return -ENXIO;

		oirq.np = gic;
		oirq.args_count = 1;
		oirq.args[0] = sr_intid;
		irq = irq_create_of_mapping(&oirq);
		of_node_put(gic);
#ifdef CONFIG_ACPI
	} else {
		irq = acpi_register_gsi(NULL, sr_intid, ACPI_EDGE_SENSITIVE,
					ACPI_ACTIVE_HIGH);
#endif
	}

	if (irq <= 0) {
		pr_err("Failed to create IRQ mapping!\n");
		return -ENODATA;
	}

	return irq;
}

static void ffa_sched_recv_irq_unmap(void)
{
	if (drv_info->sched_recv_irq)
		irq_dispose_mapping(drv_info->sched_recv_irq);
}

static int ffa_cpuhp_pcpu_irq_enable(unsigned int cpu)
{
	enable_percpu_irq(drv_info->sched_recv_irq, IRQ_TYPE_NONE);
	return 0;
}

static int ffa_cpuhp_pcpu_irq_disable(unsigned int cpu)
{
	disable_percpu_irq(drv_info->sched_recv_irq);
	return 0;
}

static void ffa_uninit_pcpu_irq(void)
{
	if (drv_info->cpuhp_state)
		cpuhp_remove_state(drv_info->cpuhp_state);

	if (drv_info->notif_pcpu_wq)
		destroy_workqueue(drv_info->notif_pcpu_wq);

	if (drv_info->sched_recv_irq)
		free_percpu_irq(drv_info->sched_recv_irq, drv_info->irq_pcpu);

	if (drv_info->irq_pcpu)
		free_percpu(drv_info->irq_pcpu);
}

static int ffa_init_pcpu_irq(unsigned int irq)
{
	struct ffa_pcpu_irq __percpu *irq_pcpu;
	int ret, cpu;

	irq_pcpu = alloc_percpu(struct ffa_pcpu_irq);
	if (!irq_pcpu)
		return -ENOMEM;

	for_each_present_cpu(cpu)
		per_cpu_ptr(irq_pcpu, cpu)->info = drv_info;

	drv_info->irq_pcpu = irq_pcpu;

	ret = request_percpu_irq(irq, irq_handler, "ARM-FFA", irq_pcpu);
	if (ret) {
		pr_err("Error registering notification IRQ %d: %d\n", irq, ret);
		return ret;
	}

	INIT_WORK(&drv_info->irq_work, ffa_sched_recv_irq_work_fn);
	INIT_WORK(&drv_info->notif_pcpu_work, notif_pcpu_irq_work_fn);
	drv_info->notif_pcpu_wq = create_workqueue("ffa_pcpu_irq_notification");
	if (!drv_info->notif_pcpu_wq)
		return -EINVAL;

	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ffa/pcpu-irq:starting",
				ffa_cpuhp_pcpu_irq_enable,
				ffa_cpuhp_pcpu_irq_disable);

	if (ret < 0)
		return ret;

	drv_info->cpuhp_state = ret;
	return 0;
}

static void ffa_notifications_cleanup(void)
{
	ffa_uninit_pcpu_irq();
	ffa_sched_recv_irq_unmap();

	if (drv_info->bitmap_created) {
		ffa_notification_bitmap_destroy();
		drv_info->bitmap_created = false;
	}
}

static int ffa_notifications_setup(void)
{
	int ret, irq;

	ret = ffa_features(FFA_NOTIFICATION_BITMAP_CREATE, 0, NULL, NULL);
	if (ret) {
		pr_err("Notifications not supported, continuing with it ..\n");
		return 0;
	}

	ret = ffa_notification_bitmap_create();
	if (ret) {
		pr_err("notification_bitmap_create error %d\n", ret);
		return ret;
	}
	drv_info->bitmap_created = true;

	irq = ffa_sched_recv_irq_map();
	if (irq <= 0) {
		ret = irq;
		goto cleanup;
	}

	drv_info->sched_recv_irq = irq;

	ret = ffa_init_pcpu_irq(irq);
	if (ret)
		goto cleanup;

	hash_init(drv_info->notifier_hash);
	mutex_init(&drv_info->notify_lock);

	/* Register internal scheduling callback */
	ret = ffa_sched_recv_cb_update(drv_info->vm_id, ffa_self_notif_handle,
				       drv_info, true);
	if (!ret)
		return ret;
cleanup:
	ffa_notifications_cleanup();
	return ret;
}

static int __init ffa_init(void)
{
	int ret;

	ret = ffa_transport_init(&invoke_ffa_fn);
	if (ret)
		return ret;

	ret = arm_ffa_bus_init();
	if (ret)
		return ret;

	drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
	if (!drv_info) {
		ret = -ENOMEM;
		goto ffa_bus_exit;
	}

	ret = ffa_version_check(&drv_info->version);
	if (ret)
		goto free_drv_info;

	if (ffa_id_get(&drv_info->vm_id)) {
		pr_err("failed to obtain VM id for self\n");
		ret = -ENODEV;
		goto free_drv_info;
	}

	drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
	if (!drv_info->rx_buffer) {
		ret = -ENOMEM;
		goto free_pages;
	}

	drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
	if (!drv_info->tx_buffer) {
		ret = -ENOMEM;
		goto free_pages;
	}

	ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
			   virt_to_phys(drv_info->rx_buffer),
			   RXTX_BUFFER_SIZE / FFA_PAGE_SIZE);
	if (ret) {
		pr_err("failed to register FFA RxTx buffers\n");
		goto free_pages;
	}

	mutex_init(&drv_info->rx_lock);
	mutex_init(&drv_info->tx_lock);

	ffa_setup_partitions();

	ffa_set_up_mem_ops_native_flag();

	ret = ffa_notifications_setup();
	if (ret)
		goto partitions_cleanup;

	return 0;
partitions_cleanup:
	ffa_partitions_cleanup();
free_pages:
	if (drv_info->tx_buffer)
		free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
	free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
free_drv_info:
	kfree(drv_info);
ffa_bus_exit:
	arm_ffa_bus_exit();
	return ret;
}
subsys_initcall(ffa_init);

static void __exit ffa_exit(void)
{
	ffa_notifications_cleanup();
	ffa_partitions_cleanup();
	ffa_rxtx_unmap(drv_info->vm_id);
	free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
	free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
	xa_destroy(&drv_info->partition_info);
	kfree(drv_info);
	arm_ffa_bus_exit();
}
module_exit(ffa_exit);

MODULE_ALIAS("arm-ffa");
MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("Arm FF-A interface driver");
MODULE_LICENSE("GPL v2");