Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   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
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Remote Processor Framework
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2011 Google, Inc.
 *
 * Ohad Ben-Cohen <ohad@wizery.com>
 * Brian Swetland <swetland@google.com>
 * Mark Grosen <mgrosen@ti.com>
 * Fernando Guzman Lugo <fernando.lugo@ti.com>
 * Suman Anna <s-anna@ti.com>
 * Robert Tivy <rtivy@ti.com>
 * Armando Uribe De Leon <x0095078@ti.com>
 */

#define pr_fmt(fmt)    "%s: " fmt, __func__

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/string.h>
#include <linux/debugfs.h>
#include <linux/devcoredump.h>
#include <linux/remoteproc.h>
#include <linux/iommu.h>
#include <linux/idr.h>
#include <linux/elf.h>
#include <linux/crc32.h>
#include <linux/of_reserved_mem.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_ring.h>
#include <asm/byteorder.h>
#include <linux/platform_device.h>

#include "remoteproc_internal.h"

#define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL

static DEFINE_MUTEX(rproc_list_mutex);
static LIST_HEAD(rproc_list);

typedef int (*rproc_handle_resources_t)(struct rproc *rproc,
				struct resource_table *table, int len);
typedef int (*rproc_handle_resource_t)(struct rproc *rproc,
				 void *, int offset, int avail);

static int rproc_alloc_carveout(struct rproc *rproc,
				struct rproc_mem_entry *mem);
static int rproc_release_carveout(struct rproc *rproc,
				  struct rproc_mem_entry *mem);

/* Unique indices for remoteproc devices */
static DEFINE_IDA(rproc_dev_index);

static const char * const rproc_crash_names[] = {
	[RPROC_MMUFAULT]	= "mmufault",
	[RPROC_WATCHDOG]	= "watchdog",
	[RPROC_FATAL_ERROR]	= "fatal error",
};

/* translate rproc_crash_type to string */
static const char *rproc_crash_to_string(enum rproc_crash_type type)
{
	if (type < ARRAY_SIZE(rproc_crash_names))
		return rproc_crash_names[type];
	return "unknown";
}

/*
 * This is the IOMMU fault handler we register with the IOMMU API
 * (when relevant; not all remote processors access memory through
 * an IOMMU).
 *
 * IOMMU core will invoke this handler whenever the remote processor
 * will try to access an unmapped device address.
 */
static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,
			     unsigned long iova, int flags, void *token)
{
	struct rproc *rproc = token;

	dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags);

	rproc_report_crash(rproc, RPROC_MMUFAULT);

	/*
	 * Let the iommu core know we're not really handling this fault;
	 * we just used it as a recovery trigger.
	 */
	return -ENOSYS;
}

static int rproc_enable_iommu(struct rproc *rproc)
{
	struct iommu_domain *domain;
	struct device *dev = rproc->dev.parent;
	int ret;

	if (!rproc->has_iommu) {
		dev_dbg(dev, "iommu not present\n");
		return 0;
	}

	domain = iommu_domain_alloc(dev->bus);
	if (!domain) {
		dev_err(dev, "can't alloc iommu domain\n");
		return -ENOMEM;
	}

	iommu_set_fault_handler(domain, rproc_iommu_fault, rproc);

	ret = iommu_attach_device(domain, dev);
	if (ret) {
		dev_err(dev, "can't attach iommu device: %d\n", ret);
		goto free_domain;
	}

	rproc->domain = domain;

	return 0;

free_domain:
	iommu_domain_free(domain);
	return ret;
}

static void rproc_disable_iommu(struct rproc *rproc)
{
	struct iommu_domain *domain = rproc->domain;
	struct device *dev = rproc->dev.parent;

	if (!domain)
		return;

	iommu_detach_device(domain, dev);
	iommu_domain_free(domain);
}

phys_addr_t rproc_va_to_pa(void *cpu_addr)
{
	/*
	 * Return physical address according to virtual address location
	 * - in vmalloc: if region ioremapped or defined as dma_alloc_coherent
	 * - in kernel: if region allocated in generic dma memory pool
	 */
	if (is_vmalloc_addr(cpu_addr)) {
		return page_to_phys(vmalloc_to_page(cpu_addr)) +
				    offset_in_page(cpu_addr);
	}

	WARN_ON(!virt_addr_valid(cpu_addr));
	return virt_to_phys(cpu_addr);
}
EXPORT_SYMBOL(rproc_va_to_pa);

/**
 * rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address
 * @rproc: handle of a remote processor
 * @da: remoteproc device address to translate
 * @len: length of the memory region @da is pointing to
 *
 * Some remote processors will ask us to allocate them physically contiguous
 * memory regions (which we call "carveouts"), and map them to specific
 * device addresses (which are hardcoded in the firmware). They may also have
 * dedicated memory regions internal to the processors, and use them either
 * exclusively or alongside carveouts.
 *
 * They may then ask us to copy objects into specific device addresses (e.g.
 * code/data sections) or expose us certain symbols in other device address
 * (e.g. their trace buffer).
 *
 * This function is a helper function with which we can go over the allocated
 * carveouts and translate specific device addresses to kernel virtual addresses
 * so we can access the referenced memory. This function also allows to perform
 * translations on the internal remoteproc memory regions through a platform
 * implementation specific da_to_va ops, if present.
 *
 * The function returns a valid kernel address on success or NULL on failure.
 *
 * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too,
 * but only on kernel direct mapped RAM memory. Instead, we're just using
 * here the output of the DMA API for the carveouts, which should be more
 * correct.
 */
void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
{
	struct rproc_mem_entry *carveout;
	void *ptr = NULL;

	if (rproc->ops->da_to_va) {
		ptr = rproc->ops->da_to_va(rproc, da, len);
		if (ptr)
			goto out;
	}

	list_for_each_entry(carveout, &rproc->carveouts, node) {
		int offset = da - carveout->da;

		/*  Verify that carveout is allocated */
		if (!carveout->va)
			continue;

		/* try next carveout if da is too small */
		if (offset < 0)
			continue;

		/* try next carveout if da is too large */
		if (offset + len > carveout->len)
			continue;

		ptr = carveout->va + offset;

		break;
	}

out:
	return ptr;
}
EXPORT_SYMBOL(rproc_da_to_va);

/**
 * rproc_find_carveout_by_name() - lookup the carveout region by a name
 * @rproc: handle of a remote processor
 * @name,..: carveout name to find (standard printf format)
 *
 * Platform driver has the capability to register some pre-allacoted carveout
 * (physically contiguous memory regions) before rproc firmware loading and
 * associated resource table analysis. These regions may be dedicated memory
 * regions internal to the coprocessor or specified DDR region with specific
 * attributes
 *
 * This function is a helper function with which we can go over the
 * allocated carveouts and return associated region characteristics like
 * coprocessor address, length or processor virtual address.
 *
 * Return: a valid pointer on carveout entry on success or NULL on failure.
 */
struct rproc_mem_entry *
rproc_find_carveout_by_name(struct rproc *rproc, const char *name, ...)
{
	va_list args;
	char _name[32];
	struct rproc_mem_entry *carveout, *mem = NULL;

	if (!name)
		return NULL;

	va_start(args, name);
	vsnprintf(_name, sizeof(_name), name, args);
	va_end(args);

	list_for_each_entry(carveout, &rproc->carveouts, node) {
		/* Compare carveout and requested names */
		if (!strcmp(carveout->name, _name)) {
			mem = carveout;
			break;
		}
	}

	return mem;
}

/**
 * rproc_check_carveout_da() - Check specified carveout da configuration
 * @rproc: handle of a remote processor
 * @mem: pointer on carveout to check
 * @da: area device address
 * @len: associated area size
 *
 * This function is a helper function to verify requested device area (couple
 * da, len) is part of specified carveout.
 * If da is not set (defined as FW_RSC_ADDR_ANY), only requested length is
 * checked.
 *
 * Return: 0 if carveout matches request else error
 */
static int rproc_check_carveout_da(struct rproc *rproc,
				   struct rproc_mem_entry *mem, u32 da, u32 len)
{
	struct device *dev = &rproc->dev;
	int delta;

	/* Check requested resource length */
	if (len > mem->len) {
		dev_err(dev, "Registered carveout doesn't fit len request\n");
		return -EINVAL;
	}

	if (da != FW_RSC_ADDR_ANY && mem->da == FW_RSC_ADDR_ANY) {
		/* Address doesn't match registered carveout configuration */
		return -EINVAL;
	} else if (da != FW_RSC_ADDR_ANY && mem->da != FW_RSC_ADDR_ANY) {
		delta = da - mem->da;

		/* Check requested resource belongs to registered carveout */
		if (delta < 0) {
			dev_err(dev,
				"Registered carveout doesn't fit da request\n");
			return -EINVAL;
		}

		if (delta + len > mem->len) {
			dev_err(dev,
				"Registered carveout doesn't fit len request\n");
			return -EINVAL;
		}
	}

	return 0;
}

int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
{
	struct rproc *rproc = rvdev->rproc;
	struct device *dev = &rproc->dev;
	struct rproc_vring *rvring = &rvdev->vring[i];
	struct fw_rsc_vdev *rsc;
	int ret, size, notifyid;
	struct rproc_mem_entry *mem;

	/* actual size of vring (in bytes) */
	size = PAGE_ALIGN(vring_size(rvring->len, rvring->align));

	rsc = (void *)rproc->table_ptr + rvdev->rsc_offset;

	/* Search for pre-registered carveout */
	mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index,
					  i);
	if (mem) {
		if (rproc_check_carveout_da(rproc, mem, rsc->vring[i].da, size))
			return -ENOMEM;
	} else {
		/* Register carveout in in list */
		mem = rproc_mem_entry_init(dev, 0, 0, size, rsc->vring[i].da,
					   rproc_alloc_carveout,
					   rproc_release_carveout,
					   "vdev%dvring%d",
					   rvdev->index, i);
		if (!mem) {
			dev_err(dev, "Can't allocate memory entry structure\n");
			return -ENOMEM;
		}

		rproc_add_carveout(rproc, mem);
	}

	/*
	 * Assign an rproc-wide unique index for this vring
	 * TODO: assign a notifyid for rvdev updates as well
	 * TODO: support predefined notifyids (via resource table)
	 */
	ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL);
	if (ret < 0) {
		dev_err(dev, "idr_alloc failed: %d\n", ret);
		return ret;
	}
	notifyid = ret;

	/* Potentially bump max_notifyid */
	if (notifyid > rproc->max_notifyid)
		rproc->max_notifyid = notifyid;

	rvring->notifyid = notifyid;

	/* Let the rproc know the notifyid of this vring.*/
	rsc->vring[i].notifyid = notifyid;
	return 0;
}

static int
rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
{
	struct rproc *rproc = rvdev->rproc;
	struct device *dev = &rproc->dev;
	struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
	struct rproc_vring *rvring = &rvdev->vring[i];

	dev_dbg(dev, "vdev rsc: vring%d: da 0x%x, qsz %d, align %d\n",
		i, vring->da, vring->num, vring->align);

	/* verify queue size and vring alignment are sane */
	if (!vring->num || !vring->align) {
		dev_err(dev, "invalid qsz (%d) or alignment (%d)\n",
			vring->num, vring->align);
		return -EINVAL;
	}

	rvring->len = vring->num;
	rvring->align = vring->align;
	rvring->rvdev = rvdev;

	return 0;
}

void rproc_free_vring(struct rproc_vring *rvring)
{
	struct rproc *rproc = rvring->rvdev->rproc;
	int idx = rvring - rvring->rvdev->vring;
	struct fw_rsc_vdev *rsc;

	idr_remove(&rproc->notifyids, rvring->notifyid);

	/* reset resource entry info */
	rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset;
	rsc->vring[idx].da = 0;
	rsc->vring[idx].notifyid = -1;
}

static int rproc_vdev_do_start(struct rproc_subdev *subdev)
{
	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);

	return rproc_add_virtio_dev(rvdev, rvdev->id);
}

static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
{
	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
	int ret;

	ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev);
	if (ret)
		dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n", ret);
}

/**
 * rproc_rvdev_release() - release the existence of a rvdev
 *
 * @dev: the subdevice's dev
 */
static void rproc_rvdev_release(struct device *dev)
{
	struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);

	of_reserved_mem_device_release(dev);

	kfree(rvdev);
}

/**
 * rproc_handle_vdev() - handle a vdev fw resource
 * @rproc: the remote processor
 * @rsc: the vring resource descriptor
 * @avail: size of available data (for sanity checking the image)
 *
 * This resource entry requests the host to statically register a virtio
 * device (vdev), and setup everything needed to support it. It contains
 * everything needed to make it possible: the virtio device id, virtio
 * device features, vrings information, virtio config space, etc...
 *
 * Before registering the vdev, the vrings are allocated from non-cacheable
 * physically contiguous memory. Currently we only support two vrings per
 * remote processor (temporary limitation). We might also want to consider
 * doing the vring allocation only later when ->find_vqs() is invoked, and
 * then release them upon ->del_vqs().
 *
 * Note: @da is currently not really handled correctly: we dynamically
 * allocate it using the DMA API, ignoring requested hard coded addresses,
 * and we don't take care of any required IOMMU programming. This is all
 * going to be taken care of when the generic iommu-based DMA API will be
 * merged. Meanwhile, statically-addressed iommu-based firmware images should
 * use RSC_DEVMEM resource entries to map their required @da to the physical
 * address of their base CMA region (ouch, hacky!).
 *
 * Returns 0 on success, or an appropriate error code otherwise
 */
static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
			     int offset, int avail)
{
	struct device *dev = &rproc->dev;
	struct rproc_vdev *rvdev;
	int i, ret;
	char name[16];

	/* make sure resource isn't truncated */
	if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
			+ rsc->config_len > avail) {
		dev_err(dev, "vdev rsc is truncated\n");
		return -EINVAL;
	}

	/* make sure reserved bytes are zeroes */
	if (rsc->reserved[0] || rsc->reserved[1]) {
		dev_err(dev, "vdev rsc has non zero reserved bytes\n");
		return -EINVAL;
	}

	dev_dbg(dev, "vdev rsc: id %d, dfeatures 0x%x, cfg len %d, %d vrings\n",
		rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);

	/* we currently support only two vrings per rvdev */
	if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
		dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
		return -EINVAL;
	}

	rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL);
	if (!rvdev)
		return -ENOMEM;

	kref_init(&rvdev->refcount);

	rvdev->id = rsc->id;
	rvdev->rproc = rproc;
	rvdev->index = rproc->nb_vdev++;

	/* Initialise vdev subdevice */
	snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
	rvdev->dev.parent = &rproc->dev;
	rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
	rvdev->dev.release = rproc_rvdev_release;
	dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
	dev_set_drvdata(&rvdev->dev, rvdev);

	ret = device_register(&rvdev->dev);
	if (ret) {
		put_device(&rvdev->dev);
		return ret;
	}
	/* Make device dma capable by inheriting from parent's capabilities */
	set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));

	ret = dma_coerce_mask_and_coherent(&rvdev->dev,
					   dma_get_mask(rproc->dev.parent));
	if (ret) {
		dev_warn(dev,
			 "Failed to set DMA mask %llx. Trying to continue... %x\n",
			 dma_get_mask(rproc->dev.parent), ret);
	}

	/* parse the vrings */
	for (i = 0; i < rsc->num_of_vrings; i++) {
		ret = rproc_parse_vring(rvdev, rsc, i);
		if (ret)
			goto free_rvdev;
	}

	/* remember the resource offset*/
	rvdev->rsc_offset = offset;

	/* allocate the vring resources */
	for (i = 0; i < rsc->num_of_vrings; i++) {
		ret = rproc_alloc_vring(rvdev, i);
		if (ret)
			goto unwind_vring_allocations;
	}

	list_add_tail(&rvdev->node, &rproc->rvdevs);

	rvdev->subdev.start = rproc_vdev_do_start;
	rvdev->subdev.stop = rproc_vdev_do_stop;

	rproc_add_subdev(rproc, &rvdev->subdev);

	return 0;

unwind_vring_allocations:
	for (i--; i >= 0; i--)
		rproc_free_vring(&rvdev->vring[i]);
free_rvdev:
	device_unregister(&rvdev->dev);
	return ret;
}

void rproc_vdev_release(struct kref *ref)
{
	struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
	struct rproc_vring *rvring;
	struct rproc *rproc = rvdev->rproc;
	int id;

	for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
		rvring = &rvdev->vring[id];
		rproc_free_vring(rvring);
	}

	rproc_remove_subdev(rproc, &rvdev->subdev);
	list_del(&rvdev->node);
	device_unregister(&rvdev->dev);
}

/**
 * rproc_handle_trace() - handle a shared trace buffer resource
 * @rproc: the remote processor
 * @rsc: the trace resource descriptor
 * @avail: size of available data (for sanity checking the image)
 *
 * In case the remote processor dumps trace logs into memory,
 * export it via debugfs.
 *
 * Currently, the 'da' member of @rsc should contain the device address
 * where the remote processor is dumping the traces. Later we could also
 * support dynamically allocating this address using the generic
 * DMA API (but currently there isn't a use case for that).
 *
 * Returns 0 on success, or an appropriate error code otherwise
 */
static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
			      int offset, int avail)
{
	struct rproc_debug_trace *trace;
	struct device *dev = &rproc->dev;
	char name[15];

	if (sizeof(*rsc) > avail) {
		dev_err(dev, "trace rsc is truncated\n");
		return -EINVAL;
	}

	/* make sure reserved bytes are zeroes */
	if (rsc->reserved) {
		dev_err(dev, "trace rsc has non zero reserved bytes\n");
		return -EINVAL;
	}

	trace = kzalloc(sizeof(*trace), GFP_KERNEL);
	if (!trace)
		return -ENOMEM;

	/* set the trace buffer dma properties */
	trace->trace_mem.len = rsc->len;
	trace->trace_mem.da = rsc->da;

	/* set pointer on rproc device */
	trace->rproc = rproc;

	/* make sure snprintf always null terminates, even if truncating */
	snprintf(name, sizeof(name), "trace%d", rproc->num_traces);

	/* create the debugfs entry */
	trace->tfile = rproc_create_trace_file(name, rproc, trace);
	if (!trace->tfile) {
		kfree(trace);
		return -EINVAL;
	}

	list_add_tail(&trace->node, &rproc->traces);

	rproc->num_traces++;

	dev_dbg(dev, "%s added: da 0x%x, len 0x%x\n",
		name, rsc->da, rsc->len);

	return 0;
}

/**
 * rproc_handle_devmem() - handle devmem resource entry
 * @rproc: remote processor handle
 * @rsc: the devmem resource entry
 * @avail: size of available data (for sanity checking the image)
 *
 * Remote processors commonly need to access certain on-chip peripherals.
 *
 * Some of these remote processors access memory via an iommu device,
 * and might require us to configure their iommu before they can access
 * the on-chip peripherals they need.
 *
 * This resource entry is a request to map such a peripheral device.
 *
 * These devmem entries will contain the physical address of the device in
 * the 'pa' member. If a specific device address is expected, then 'da' will
 * contain it (currently this is the only use case supported). 'len' will
 * contain the size of the physical region we need to map.
 *
 * Currently we just "trust" those devmem entries to contain valid physical
 * addresses, but this is going to change: we want the implementations to
 * tell us ranges of physical addresses the firmware is allowed to request,
 * and not allow firmwares to request access to physical addresses that
 * are outside those ranges.
 */
static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
			       int offset, int avail)
{
	struct rproc_mem_entry *mapping;
	struct device *dev = &rproc->dev;
	int ret;

	/* no point in handling this resource without a valid iommu domain */
	if (!rproc->domain)
		return -EINVAL;

	if (sizeof(*rsc) > avail) {
		dev_err(dev, "devmem rsc is truncated\n");
		return -EINVAL;
	}

	/* make sure reserved bytes are zeroes */
	if (rsc->reserved) {
		dev_err(dev, "devmem rsc has non zero reserved bytes\n");
		return -EINVAL;
	}

	mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
	if (!mapping)
		return -ENOMEM;

	ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags);
	if (ret) {
		dev_err(dev, "failed to map devmem: %d\n", ret);
		goto out;
	}

	/*
	 * We'll need this info later when we'll want to unmap everything
	 * (e.g. on shutdown).
	 *
	 * We can't trust the remote processor not to change the resource
	 * table, so we must maintain this info independently.
	 */
	mapping->da = rsc->da;
	mapping->len = rsc->len;
	list_add_tail(&mapping->node, &rproc->mappings);

	dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n",
		rsc->pa, rsc->da, rsc->len);

	return 0;

out:
	kfree(mapping);
	return ret;
}

/**
 * rproc_alloc_carveout() - allocated specified carveout
 * @rproc: rproc handle
 * @mem: the memory entry to allocate
 *
 * This function allocate specified memory entry @mem using
 * dma_alloc_coherent() as default allocator
 */
static int rproc_alloc_carveout(struct rproc *rproc,
				struct rproc_mem_entry *mem)
{
	struct rproc_mem_entry *mapping = NULL;
	struct device *dev = &rproc->dev;
	dma_addr_t dma;
	void *va;
	int ret;

	va = dma_alloc_coherent(dev->parent, mem->len, &dma, GFP_KERNEL);
	if (!va) {
		dev_err(dev->parent,
			"failed to allocate dma memory: len 0x%x\n", mem->len);
		return -ENOMEM;
	}

	dev_dbg(dev, "carveout va %pK, dma %pad, len 0x%x\n",
		va, &dma, mem->len);

	if (mem->da != FW_RSC_ADDR_ANY && !rproc->domain) {
		/*
		 * Check requested da is equal to dma address
		 * and print a warn message in case of missalignment.
		 * Don't stop rproc_start sequence as coprocessor may
		 * build pa to da translation on its side.
		 */
		if (mem->da != (u32)dma)
			dev_warn(dev->parent,
				 "Allocated carveout doesn't fit device address request\n");
	}

	/*
	 * Ok, this is non-standard.
	 *
	 * Sometimes we can't rely on the generic iommu-based DMA API
	 * to dynamically allocate the device address and then set the IOMMU
	 * tables accordingly, because some remote processors might
	 * _require_ us to use hard coded device addresses that their
	 * firmware was compiled with.
	 *
	 * In this case, we must use the IOMMU API directly and map
	 * the memory to the device address as expected by the remote
	 * processor.
	 *
	 * Obviously such remote processor devices should not be configured
	 * to use the iommu-based DMA API: we expect 'dma' to contain the
	 * physical address in this case.
	 */
	if (mem->da != FW_RSC_ADDR_ANY && rproc->domain) {
		mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
		if (!mapping) {
			ret = -ENOMEM;
			goto dma_free;
		}

		ret = iommu_map(rproc->domain, mem->da, dma, mem->len,
				mem->flags);
		if (ret) {
			dev_err(dev, "iommu_map failed: %d\n", ret);
			goto free_mapping;
		}

		/*
		 * We'll need this info later when we'll want to unmap
		 * everything (e.g. on shutdown).
		 *
		 * We can't trust the remote processor not to change the
		 * resource table, so we must maintain this info independently.
		 */
		mapping->da = mem->da;
		mapping->len = mem->len;
		list_add_tail(&mapping->node, &rproc->mappings);

		dev_dbg(dev, "carveout mapped 0x%x to %pad\n",
			mem->da, &dma);
	}

	if (mem->da == FW_RSC_ADDR_ANY) {
		/* Update device address as undefined by requester */
		if ((u64)dma & HIGH_BITS_MASK)
			dev_warn(dev, "DMA address cast in 32bit to fit resource table format\n");

		mem->da = (u32)dma;
	}

	mem->dma = dma;
	mem->va = va;

	return 0;

free_mapping:
	kfree(mapping);
dma_free:
	dma_free_coherent(dev->parent, mem->len, va, dma);
	return ret;
}

/**
 * rproc_release_carveout() - release acquired carveout
 * @rproc: rproc handle
 * @mem: the memory entry to release
 *
 * This function releases specified memory entry @mem allocated via
 * rproc_alloc_carveout() function by @rproc.
 */
static int rproc_release_carveout(struct rproc *rproc,
				  struct rproc_mem_entry *mem)
{
	struct device *dev = &rproc->dev;

	/* clean up carveout allocations */
	dma_free_coherent(dev->parent, mem->len, mem->va, mem->dma);
	return 0;
}

/**
 * rproc_handle_carveout() - handle phys contig memory allocation requests
 * @rproc: rproc handle
 * @rsc: the resource entry
 * @avail: size of available data (for image validation)
 *
 * This function will handle firmware requests for allocation of physically
 * contiguous memory regions.
 *
 * These request entries should come first in the firmware's resource table,
 * as other firmware entries might request placing other data objects inside
 * these memory regions (e.g. data/code segments, trace resource entries, ...).
 *
 * Allocating memory this way helps utilizing the reserved physical memory
 * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
 * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
 * pressure is important; it may have a substantial impact on performance.
 */
static int rproc_handle_carveout(struct rproc *rproc,
				 struct fw_rsc_carveout *rsc,
				 int offset, int avail)
{
	struct rproc_mem_entry *carveout;
	struct device *dev = &rproc->dev;

	if (sizeof(*rsc) > avail) {
		dev_err(dev, "carveout rsc is truncated\n");
		return -EINVAL;
	}

	/* make sure reserved bytes are zeroes */
	if (rsc->reserved) {
		dev_err(dev, "carveout rsc has non zero reserved bytes\n");
		return -EINVAL;
	}

	dev_dbg(dev, "carveout rsc: name: %s, da 0x%x, pa 0x%x, len 0x%x, flags 0x%x\n",
		rsc->name, rsc->da, rsc->pa, rsc->len, rsc->flags);

	/*
	 * Check carveout rsc already part of a registered carveout,
	 * Search by name, then check the da and length
	 */
	carveout = rproc_find_carveout_by_name(rproc, rsc->name);

	if (carveout) {
		if (carveout->rsc_offset != FW_RSC_ADDR_ANY) {
			dev_err(dev,
				"Carveout already associated to resource table\n");
			return -ENOMEM;
		}

		if (rproc_check_carveout_da(rproc, carveout, rsc->da, rsc->len))
			return -ENOMEM;

		/* Update memory carveout with resource table info */
		carveout->rsc_offset = offset;
		carveout->flags = rsc->flags;

		return 0;
	}

	/* Register carveout in in list */
	carveout = rproc_mem_entry_init(dev, 0, 0, rsc->len, rsc->da,
					rproc_alloc_carveout,
					rproc_release_carveout, rsc->name);
	if (!carveout) {
		dev_err(dev, "Can't allocate memory entry structure\n");
		return -ENOMEM;
	}

	carveout->flags = rsc->flags;
	carveout->rsc_offset = offset;
	rproc_add_carveout(rproc, carveout);

	return 0;
}

/**
 * rproc_add_carveout() - register an allocated carveout region
 * @rproc: rproc handle
 * @mem: memory entry to register
 *
 * This function registers specified memory entry in @rproc carveouts list.
 * Specified carveout should have been allocated before registering.
 */
void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry *mem)
{
	list_add_tail(&mem->node, &rproc->carveouts);
}
EXPORT_SYMBOL(rproc_add_carveout);

/**
 * rproc_mem_entry_init() - allocate and initialize rproc_mem_entry struct
 * @dev: pointer on device struct
 * @va: virtual address
 * @dma: dma address
 * @len: memory carveout length
 * @da: device address
 * @alloc: memory carveout allocation function
 * @release: memory carveout release function
 * @name: carveout name
 *
 * This function allocates a rproc_mem_entry struct and fill it with parameters
 * provided by client.
 */
struct rproc_mem_entry *
rproc_mem_entry_init(struct device *dev,
		     void *va, dma_addr_t dma, int len, u32 da,
		     int (*alloc)(struct rproc *, struct rproc_mem_entry *),
		     int (*release)(struct rproc *, struct rproc_mem_entry *),
		     const char *name, ...)
{
	struct rproc_mem_entry *mem;
	va_list args;

	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
	if (!mem)
		return mem;

	mem->va = va;
	mem->dma = dma;
	mem->da = da;
	mem->len = len;
	mem->alloc = alloc;
	mem->release = release;
	mem->rsc_offset = FW_RSC_ADDR_ANY;
	mem->of_resm_idx = -1;

	va_start(args, name);
	vsnprintf(mem->name, sizeof(mem->name), name, args);
	va_end(args);

	return mem;
}
EXPORT_SYMBOL(rproc_mem_entry_init);

/**
 * rproc_of_resm_mem_entry_init() - allocate and initialize rproc_mem_entry struct
 * from a reserved memory phandle
 * @dev: pointer on device struct
 * @of_resm_idx: reserved memory phandle index in "memory-region"
 * @len: memory carveout length
 * @da: device address
 * @name: carveout name
 *
 * This function allocates a rproc_mem_entry struct and fill it with parameters
 * provided by client.
 */
struct rproc_mem_entry *
rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, int len,
			     u32 da, const char *name, ...)
{
	struct rproc_mem_entry *mem;
	va_list args;

	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
	if (!mem)
		return mem;

	mem->da = da;
	mem->len = len;
	mem->rsc_offset = FW_RSC_ADDR_ANY;
	mem->of_resm_idx = of_resm_idx;

	va_start(args, name);
	vsnprintf(mem->name, sizeof(mem->name), name, args);
	va_end(args);

	return mem;
}
EXPORT_SYMBOL(rproc_of_resm_mem_entry_init);

/**
 * A lookup table for resource handlers. The indices are defined in
 * enum fw_resource_type.
 */
static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = {
	[RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
	[RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
	[RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
	[RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev,
};

/* handle firmware resource entries before booting the remote processor */
static int rproc_handle_resources(struct rproc *rproc,
				  rproc_handle_resource_t handlers[RSC_LAST])
{
	struct device *dev = &rproc->dev;
	rproc_handle_resource_t handler;
	int ret = 0, i;

	if (!rproc->table_ptr)
		return 0;

	for (i = 0; i < rproc->table_ptr->num; i++) {
		int offset = rproc->table_ptr->offset[i];
		struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset;
		int avail = rproc->table_sz - offset - sizeof(*hdr);
		void *rsc = (void *)hdr + sizeof(*hdr);

		/* make sure table isn't truncated */
		if (avail < 0) {
			dev_err(dev, "rsc table is truncated\n");
			return -EINVAL;
		}

		dev_dbg(dev, "rsc: type %d\n", hdr->type);

		if (hdr->type >= RSC_VENDOR_START &&
		    hdr->type <= RSC_VENDOR_END) {
			ret = rproc_handle_rsc(rproc, hdr->type, rsc,
					       offset + sizeof(*hdr), avail);
			if (ret == RSC_HANDLED)
				continue;
			else if (ret < 0)
				break;

			dev_warn(dev, "unsupported vendor resource %d\n",
				 hdr->type);
			continue;
		}

		if (hdr->type >= RSC_LAST) {
			dev_warn(dev, "unsupported resource %d\n", hdr->type);
			continue;
		}

		handler = handlers[hdr->type];
		if (!handler)
			continue;

		ret = handler(rproc, rsc, offset + sizeof(*hdr), avail);
		if (ret)
			break;
	}

	return ret;
}

static int rproc_prepare_subdevices(struct rproc *rproc)
{
	struct rproc_subdev *subdev;
	int ret;

	list_for_each_entry(subdev, &rproc->subdevs, node) {
		if (subdev->prepare) {
			ret = subdev->prepare(subdev);
			if (ret)
				goto unroll_preparation;
		}
	}

	return 0;

unroll_preparation:
	list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
		if (subdev->unprepare)
			subdev->unprepare(subdev);
	}

	return ret;
}

static int rproc_start_subdevices(struct rproc *rproc)
{
	struct rproc_subdev *subdev;
	int ret;

	list_for_each_entry(subdev, &rproc->subdevs, node) {
		if (subdev->start) {
			ret = subdev->start(subdev);
			if (ret)
				goto unroll_registration;
		}
	}

	return 0;

unroll_registration:
	list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
		if (subdev->stop)
			subdev->stop(subdev, true);
	}

	return ret;
}

static void rproc_stop_subdevices(struct rproc *rproc, bool crashed)
{
	struct rproc_subdev *subdev;

	list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
		if (subdev->stop)
			subdev->stop(subdev, crashed);
	}
}

static void rproc_unprepare_subdevices(struct rproc *rproc)
{
	struct rproc_subdev *subdev;

	list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
		if (subdev->unprepare)
			subdev->unprepare(subdev);
	}
}

/**
 * rproc_alloc_registered_carveouts() - allocate all carveouts registered
 * in the list
 * @rproc: the remote processor handle
 *
 * This function parses registered carveout list, performs allocation
 * if alloc() ops registered and updates resource table information
 * if rsc_offset set.
 *
 * Return: 0 on success
 */
static int rproc_alloc_registered_carveouts(struct rproc *rproc)
{
	struct rproc_mem_entry *entry, *tmp;
	struct fw_rsc_carveout *rsc;
	struct device *dev = &rproc->dev;
	u64 pa;
	int ret;

	list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
		if (entry->alloc) {
			ret = entry->alloc(rproc, entry);
			if (ret) {
				dev_err(dev, "Unable to allocate carveout %s: %d\n",
					entry->name, ret);
				return -ENOMEM;
			}
		}

		if (entry->rsc_offset != FW_RSC_ADDR_ANY) {
			/* update resource table */
			rsc = (void *)rproc->table_ptr + entry->rsc_offset;

			/*
			 * Some remote processors might need to know the pa
			 * even though they are behind an IOMMU. E.g., OMAP4's
			 * remote M3 processor needs this so it can control
			 * on-chip hardware accelerators that are not behind
			 * the IOMMU, and therefor must know the pa.
			 *
			 * Generally we don't want to expose physical addresses
			 * if we don't have to (remote processors are generally
			 * _not_ trusted), so we might want to do this only for
			 * remote processor that _must_ have this (e.g. OMAP4's
			 * dual M3 subsystem).
			 *
			 * Non-IOMMU processors might also want to have this info.
			 * In this case, the device address and the physical address
			 * are the same.
			 */

			/* Use va if defined else dma to generate pa */
			if (entry->va)
				pa = (u64)rproc_va_to_pa(entry->va);
			else
				pa = (u64)entry->dma;

			if (((u64)pa) & HIGH_BITS_MASK)
				dev_warn(dev,
					 "Physical address cast in 32bit to fit resource table format\n");

			rsc->pa = (u32)pa;
			rsc->da = entry->da;
			rsc->len = entry->len;
		}
	}

	return 0;
}

/**
 * rproc_coredump_cleanup() - clean up dump_segments list
 * @rproc: the remote processor handle
 */
static void rproc_coredump_cleanup(struct rproc *rproc)
{
	struct rproc_dump_segment *entry, *tmp;

	list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
		list_del(&entry->node);
		kfree(entry);
	}
}

/**
 * rproc_resource_cleanup() - clean up and free all acquired resources
 * @rproc: rproc handle
 *
 * This function will free all resources acquired for @rproc, and it
 * is called whenever @rproc either shuts down or fails to boot.
 */
static void rproc_resource_cleanup(struct rproc *rproc)
{
	struct rproc_mem_entry *entry, *tmp;
	struct rproc_debug_trace *trace, *ttmp;
	struct rproc_vdev *rvdev, *rvtmp;
	struct device *dev = &rproc->dev;

	/* clean up debugfs trace entries */
	list_for_each_entry_safe(trace, ttmp, &rproc->traces, node) {
		rproc_remove_trace_file(trace->tfile);
		rproc->num_traces--;
		list_del(&trace->node);
		kfree(trace);
	}

	/* clean up iommu mapping entries */
	list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) {
		size_t unmapped;

		unmapped = iommu_unmap(rproc->domain, entry->da, entry->len);
		if (unmapped != entry->len) {
			/* nothing much to do besides complaining */
			dev_err(dev, "failed to unmap %u/%zu\n", entry->len,
				unmapped);
		}

		list_del(&entry->node);
		kfree(entry);
	}

	/* clean up carveout allocations */
	list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
		if (entry->release)
			entry->release(rproc, entry);
		list_del(&entry->node);
		kfree(entry);
	}

	/* clean up remote vdev entries */
	list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
		kref_put(&rvdev->refcount, rproc_vdev_release);

	rproc_coredump_cleanup(rproc);
}

static int rproc_start(struct rproc *rproc, const struct firmware *fw)
{
	struct resource_table *loaded_table;
	struct device *dev = &rproc->dev;
	int ret;

	/* load the ELF segments to memory */
	ret = rproc_load_segments(rproc, fw);
	if (ret) {
		dev_err(dev, "Failed to load program segments: %d\n", ret);
		return ret;
	}

	/*
	 * The starting device has been given the rproc->cached_table as the
	 * resource table. The address of the vring along with the other
	 * allocated resources (carveouts etc) is stored in cached_table.
	 * In order to pass this information to the remote device we must copy
	 * this information to device memory. We also update the table_ptr so
	 * that any subsequent changes will be applied to the loaded version.
	 */
	loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
	if (loaded_table) {
		memcpy(loaded_table, rproc->cached_table, rproc->table_sz);
		rproc->table_ptr = loaded_table;
	}

	ret = rproc_prepare_subdevices(rproc);
	if (ret) {
		dev_err(dev, "failed to prepare subdevices for %s: %d\n",
			rproc->name, ret);
		goto reset_table_ptr;
	}

	/* power up the remote processor */
	ret = rproc->ops->start(rproc);
	if (ret) {
		dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
		goto unprepare_subdevices;
	}

	/* Start any subdevices for the remote processor */
	ret = rproc_start_subdevices(rproc);
	if (ret) {
		dev_err(dev, "failed to probe subdevices for %s: %d\n",
			rproc->name, ret);
		goto stop_rproc;
	}

	rproc->state = RPROC_RUNNING;

	dev_info(dev, "remote processor %s is now up\n", rproc->name);

	return 0;

stop_rproc:
	rproc->ops->stop(rproc);
unprepare_subdevices:
	rproc_unprepare_subdevices(rproc);
reset_table_ptr:
	rproc->table_ptr = rproc->cached_table;

	return ret;
}

/*
 * take a firmware and boot a remote processor with it.
 */
static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
{
	struct device *dev = &rproc->dev;
	const char *name = rproc->firmware;
	int ret;

	ret = rproc_fw_sanity_check(rproc, fw);
	if (ret)
		return ret;

	dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size);

	/*
	 * if enabling an IOMMU isn't relevant for this rproc, this is
	 * just a nop
	 */
	ret = rproc_enable_iommu(rproc);
	if (ret) {
		dev_err(dev, "can't enable iommu: %d\n", ret);
		return ret;
	}

	rproc->bootaddr = rproc_get_boot_addr(rproc, fw);

	/* Load resource table, core dump segment list etc from the firmware */
	ret = rproc_parse_fw(rproc, fw);
	if (ret)
		goto disable_iommu;

	/* reset max_notifyid */
	rproc->max_notifyid = -1;

	/* reset handled vdev */
	rproc->nb_vdev = 0;

	/* handle fw resources which are required to boot rproc */
	ret = rproc_handle_resources(rproc, rproc_loading_handlers);
	if (ret) {
		dev_err(dev, "Failed to process resources: %d\n", ret);
		goto clean_up_resources;
	}

	/* Allocate carveout resources associated to rproc */
	ret = rproc_alloc_registered_carveouts(rproc);
	if (ret) {
		dev_err(dev, "Failed to allocate associated carveouts: %d\n",
			ret);
		goto clean_up_resources;
	}

	ret = rproc_start(rproc, fw);
	if (ret)
		goto clean_up_resources;

	return 0;

clean_up_resources:
	rproc_resource_cleanup(rproc);
	kfree(rproc->cached_table);
	rproc->cached_table = NULL;
	rproc->table_ptr = NULL;
disable_iommu:
	rproc_disable_iommu(rproc);
	return ret;
}

/*
 * take a firmware and boot it up.
 *
 * Note: this function is called asynchronously upon registration of the
 * remote processor (so we must wait until it completes before we try
 * to unregister the device. one other option is just to use kref here,
 * that might be cleaner).
 */
static void rproc_auto_boot_callback(const struct firmware *fw, void *context)
{
	struct rproc *rproc = context;

	rproc_boot(rproc);

	release_firmware(fw);
}

static int rproc_trigger_auto_boot(struct rproc *rproc)
{
	int ret;

	/*
	 * We're initiating an asynchronous firmware loading, so we can
	 * be built-in kernel code, without hanging the boot process.
	 */
	ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
				      rproc->firmware, &rproc->dev, GFP_KERNEL,
				      rproc, rproc_auto_boot_callback);
	if (ret < 0)
		dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret);

	return ret;
}

static int rproc_stop(struct rproc *rproc, bool crashed)
{
	struct device *dev = &rproc->dev;
	int ret;

	/* Stop any subdevices for the remote processor */
	rproc_stop_subdevices(rproc, crashed);

	/* the installed resource table is no longer accessible */
	rproc->table_ptr = rproc->cached_table;

	/* power off the remote processor */
	ret = rproc->ops->stop(rproc);
	if (ret) {
		dev_err(dev, "can't stop rproc: %d\n", ret);
		return ret;
	}

	rproc_unprepare_subdevices(rproc);

	rproc->state = RPROC_OFFLINE;

	dev_info(dev, "stopped remote processor %s\n", rproc->name);

	return 0;
}

/**
 * rproc_coredump_add_segment() - add segment of device memory to coredump
 * @rproc:	handle of a remote processor
 * @da:		device address
 * @size:	size of segment
 *
 * Add device memory to the list of segments to be included in a coredump for
 * the remoteproc.
 *
 * Return: 0 on success, negative errno on error.
 */
int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size)
{
	struct rproc_dump_segment *segment;

	segment = kzalloc(sizeof(*segment), GFP_KERNEL);
	if (!segment)
		return -ENOMEM;

	segment->da = da;
	segment->size = size;

	list_add_tail(&segment->node, &rproc->dump_segments);

	return 0;
}
EXPORT_SYMBOL(rproc_coredump_add_segment);

/**
 * rproc_coredump_add_custom_segment() - add custom coredump segment
 * @rproc:	handle of a remote processor
 * @da:		device address
 * @size:	size of segment
 * @dumpfn:	custom dump function called for each segment during coredump
 * @priv:	private data
 *
 * Add device memory to the list of segments to be included in the coredump
 * and associate the segment with the given custom dump function and private
 * data.
 *
 * Return: 0 on success, negative errno on error.
 */
int rproc_coredump_add_custom_segment(struct rproc *rproc,
				      dma_addr_t da, size_t size,
				      void (*dumpfn)(struct rproc *rproc,
						     struct rproc_dump_segment *segment,
						     void *dest),
				      void *priv)
{
	struct rproc_dump_segment *segment;

	segment = kzalloc(sizeof(*segment), GFP_KERNEL);
	if (!segment)
		return -ENOMEM;

	segment->da = da;
	segment->size = size;
	segment->priv = priv;
	segment->dump = dumpfn;

	list_add_tail(&segment->node, &rproc->dump_segments);

	return 0;
}
EXPORT_SYMBOL(rproc_coredump_add_custom_segment);

/**
 * rproc_coredump() - perform coredump
 * @rproc:	rproc handle
 *
 * This function will generate an ELF header for the registered segments
 * and create a devcoredump device associated with rproc.
 */
static void rproc_coredump(struct rproc *rproc)
{
	struct rproc_dump_segment *segment;
	struct elf32_phdr *phdr;
	struct elf32_hdr *ehdr;
	size_t data_size;
	size_t offset;
	void *data;
	void *ptr;
	int phnum = 0;

	if (list_empty(&rproc->dump_segments))
		return;

	data_size = sizeof(*ehdr);
	list_for_each_entry(segment, &rproc->dump_segments, node) {
		data_size += sizeof(*phdr) + segment->size;

		phnum++;
	}

	data = vmalloc(data_size);
	if (!data)
		return;

	ehdr = data;

	memset(ehdr, 0, sizeof(*ehdr));
	memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
	ehdr->e_ident[EI_CLASS] = ELFCLASS32;
	ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
	ehdr->e_ident[EI_VERSION] = EV_CURRENT;
	ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
	ehdr->e_type = ET_CORE;
	ehdr->e_machine = EM_NONE;
	ehdr->e_version = EV_CURRENT;
	ehdr->e_entry = rproc->bootaddr;
	ehdr->e_phoff = sizeof(*ehdr);
	ehdr->e_ehsize = sizeof(*ehdr);
	ehdr->e_phentsize = sizeof(*phdr);
	ehdr->e_phnum = phnum;

	phdr = data + ehdr->e_phoff;
	offset = ehdr->e_phoff + sizeof(*phdr) * ehdr->e_phnum;
	list_for_each_entry(segment, &rproc->dump_segments, node) {
		memset(phdr, 0, sizeof(*phdr));
		phdr->p_type = PT_LOAD;
		phdr->p_offset = offset;
		phdr->p_vaddr = segment->da;
		phdr->p_paddr = segment->da;
		phdr->p_filesz = segment->size;
		phdr->p_memsz = segment->size;
		phdr->p_flags = PF_R | PF_W | PF_X;
		phdr->p_align = 0;

		if (segment->dump) {
			segment->dump(rproc, segment, data + offset);
		} else {
			ptr = rproc_da_to_va(rproc, segment->da, segment->size);
			if (!ptr) {
				dev_err(&rproc->dev,
					"invalid coredump segment (%pad, %zu)\n",
					&segment->da, segment->size);
				memset(data + offset, 0xff, segment->size);
			} else {
				memcpy(data + offset, ptr, segment->size);
			}
		}

		offset += phdr->p_filesz;
		phdr++;
	}

	dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
}

/**
 * rproc_trigger_recovery() - recover a remoteproc
 * @rproc: the remote processor
 *
 * The recovery is done by resetting all the virtio devices, that way all the
 * rpmsg drivers will be reseted along with the remote processor making the
 * remoteproc functional again.
 *
 * This function can sleep, so it cannot be called from atomic context.
 */
int rproc_trigger_recovery(struct rproc *rproc)
{
	const struct firmware *firmware_p;
	struct device *dev = &rproc->dev;
	int ret;

	dev_err(dev, "recovering %s\n", rproc->name);

	ret = mutex_lock_interruptible(&rproc->lock);
	if (ret)
		return ret;

	ret = rproc_stop(rproc, true);
	if (ret)
		goto unlock_mutex;

	/* generate coredump */
	rproc_coredump(rproc);

	/* load firmware */
	ret = request_firmware(&firmware_p, rproc->firmware, dev);
	if (ret < 0) {
		dev_err(dev, "request_firmware failed: %d\n", ret);
		goto unlock_mutex;
	}

	/* boot the remote processor up again */
	ret = rproc_start(rproc, firmware_p);

	release_firmware(firmware_p);

unlock_mutex:
	mutex_unlock(&rproc->lock);
	return ret;
}

/**
 * rproc_crash_handler_work() - handle a crash
 *
 * This function needs to handle everything related to a crash, like cpu
 * registers and stack dump, information to help to debug the fatal error, etc.
 */
static void rproc_crash_handler_work(struct work_struct *work)
{
	struct rproc *rproc = container_of(work, struct rproc, crash_handler);
	struct device *dev = &rproc->dev;

	dev_dbg(dev, "enter %s\n", __func__);

	mutex_lock(&rproc->lock);

	if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) {
		/* handle only the first crash detected */
		mutex_unlock(&rproc->lock);
		return;
	}

	rproc->state = RPROC_CRASHED;
	dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt,
		rproc->name);

	mutex_unlock(&rproc->lock);

	if (!rproc->recovery_disabled)
		rproc_trigger_recovery(rproc);
}

/**
 * rproc_boot() - boot a remote processor
 * @rproc: handle of a remote processor
 *
 * Boot a remote processor (i.e. load its firmware, power it on, ...).
 *
 * If the remote processor is already powered on, this function immediately
 * returns (successfully).
 *
 * Returns 0 on success, and an appropriate error value otherwise.
 */
int rproc_boot(struct rproc *rproc)
{
	const struct firmware *firmware_p;
	struct device *dev;
	int ret;

	if (!rproc) {
		pr_err("invalid rproc handle\n");
		return -EINVAL;
	}

	dev = &rproc->dev;

	ret = mutex_lock_interruptible(&rproc->lock);
	if (ret) {
		dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
		return ret;
	}

	if (rproc->state == RPROC_DELETED) {
		ret = -ENODEV;
		dev_err(dev, "can't boot deleted rproc %s\n", rproc->name);
		goto unlock_mutex;
	}

	/* skip the boot process if rproc is already powered up */
	if (atomic_inc_return(&rproc->power) > 1) {
		ret = 0;
		goto unlock_mutex;
	}

	dev_info(dev, "powering up %s\n", rproc->name);

	/* load firmware */
	ret = request_firmware(&firmware_p, rproc->firmware, dev);
	if (ret < 0) {
		dev_err(dev, "request_firmware failed: %d\n", ret);
		goto downref_rproc;
	}

	ret = rproc_fw_boot(rproc, firmware_p);

	release_firmware(firmware_p);

downref_rproc:
	if (ret)
		atomic_dec(&rproc->power);
unlock_mutex:
	mutex_unlock(&rproc->lock);
	return ret;
}
EXPORT_SYMBOL(rproc_boot);

/**
 * rproc_shutdown() - power off the remote processor
 * @rproc: the remote processor
 *
 * Power off a remote processor (previously booted with rproc_boot()).
 *
 * In case @rproc is still being used by an additional user(s), then
 * this function will just decrement the power refcount and exit,
 * without really powering off the device.
 *
 * Every call to rproc_boot() must (eventually) be accompanied by a call
 * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.
 *
 * Notes:
 * - we're not decrementing the rproc's refcount, only the power refcount.
 *   which means that the @rproc handle stays valid even after rproc_shutdown()
 *   returns, and users can still use it with a subsequent rproc_boot(), if
 *   needed.
 */
void rproc_shutdown(struct rproc *rproc)
{
	struct device *dev = &rproc->dev;
	int ret;

	ret = mutex_lock_interruptible(&rproc->lock);
	if (ret) {
		dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
		return;
	}

	/* if the remote proc is still needed, bail out */
	if (!atomic_dec_and_test(&rproc->power))
		goto out;

	ret = rproc_stop(rproc, false);
	if (ret) {
		atomic_inc(&rproc->power);
		goto out;
	}

	/* clean up all acquired resources */
	rproc_resource_cleanup(rproc);

	rproc_disable_iommu(rproc);

	/* Free the copy of the resource table */
	kfree(rproc->cached_table);
	rproc->cached_table = NULL;
	rproc->table_ptr = NULL;
out:
	mutex_unlock(&rproc->lock);
}
EXPORT_SYMBOL(rproc_shutdown);

/**
 * rproc_get_by_phandle() - find a remote processor by phandle
 * @phandle: phandle to the rproc
 *
 * Finds an rproc handle using the remote processor's phandle, and then
 * return a handle to the rproc.
 *
 * This function increments the remote processor's refcount, so always
 * use rproc_put() to decrement it back once rproc isn't needed anymore.
 *
 * Returns the rproc handle on success, and NULL on failure.
 */
#ifdef CONFIG_OF
struct rproc *rproc_get_by_phandle(phandle phandle)
{
	struct rproc *rproc = NULL, *r;
	struct device_node *np;

	np = of_find_node_by_phandle(phandle);
	if (!np)
		return NULL;

	mutex_lock(&rproc_list_mutex);
	list_for_each_entry(r, &rproc_list, node) {
		if (r->dev.parent && r->dev.parent->of_node == np) {
			/* prevent underlying implementation from being removed */
			if (!try_module_get(r->dev.parent->driver->owner)) {
				dev_err(&r->dev, "can't get owner\n");
				break;
			}

			rproc = r;
			get_device(&rproc->dev);
			break;
		}
	}
	mutex_unlock(&rproc_list_mutex);

	of_node_put(np);

	return rproc;
}
#else
struct rproc *rproc_get_by_phandle(phandle phandle)
{
	return NULL;
}
#endif
EXPORT_SYMBOL(rproc_get_by_phandle);

/**
 * rproc_add() - register a remote processor
 * @rproc: the remote processor handle to register
 *
 * Registers @rproc with the remoteproc framework, after it has been
 * allocated with rproc_alloc().
 *
 * This is called by the platform-specific rproc implementation, whenever
 * a new remote processor device is probed.
 *
 * Returns 0 on success and an appropriate error code otherwise.
 *
 * Note: this function initiates an asynchronous firmware loading
 * context, which will look for virtio devices supported by the rproc's
 * firmware.
 *
 * If found, those virtio devices will be created and added, so as a result
 * of registering this remote processor, additional virtio drivers might be
 * probed.
 */
int rproc_add(struct rproc *rproc)
{
	struct device *dev = &rproc->dev;
	int ret;

	ret = device_add(dev);
	if (ret < 0)
		return ret;

	dev_info(dev, "%s is available\n", rproc->name);

	/* create debugfs entries */
	rproc_create_debug_dir(rproc);

	/* if rproc is marked always-on, request it to boot */
	if (rproc->auto_boot) {
		ret = rproc_trigger_auto_boot(rproc);
		if (ret < 0)
			return ret;
	}

	/* expose to rproc_get_by_phandle users */
	mutex_lock(&rproc_list_mutex);
	list_add(&rproc->node, &rproc_list);
	mutex_unlock(&rproc_list_mutex);

	return 0;
}
EXPORT_SYMBOL(rproc_add);

/**
 * rproc_type_release() - release a remote processor instance
 * @dev: the rproc's device
 *
 * This function should _never_ be called directly.
 *
 * It will be called by the driver core when no one holds a valid pointer
 * to @dev anymore.
 */
static void rproc_type_release(struct device *dev)
{
	struct rproc *rproc = container_of(dev, struct rproc, dev);

	dev_info(&rproc->dev, "releasing %s\n", rproc->name);

	idr_destroy(&rproc->notifyids);

	if (rproc->index >= 0)
		ida_simple_remove(&rproc_dev_index, rproc->index);

	kfree(rproc->firmware);
	kfree(rproc->ops);
	kfree(rproc);
}

static const struct device_type rproc_type = {
	.name		= "remoteproc",
	.release	= rproc_type_release,
};

/**
 * rproc_alloc() - allocate a remote processor handle
 * @dev: the underlying device
 * @name: name of this remote processor
 * @ops: platform-specific handlers (mainly start/stop)
 * @firmware: name of firmware file to load, can be NULL
 * @len: length of private data needed by the rproc driver (in bytes)
 *
 * Allocates a new remote processor handle, but does not register
 * it yet. if @firmware is NULL, a default name is used.
 *
 * This function should be used by rproc implementations during initialization
 * of the remote processor.
 *
 * After creating an rproc handle using this function, and when ready,
 * implementations should then call rproc_add() to complete
 * the registration of the remote processor.
 *
 * On success the new rproc is returned, and on failure, NULL.
 *
 * Note: _never_ directly deallocate @rproc, even if it was not registered
 * yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().
 */
struct rproc *rproc_alloc(struct device *dev, const char *name,
			  const struct rproc_ops *ops,
			  const char *firmware, int len)
{
	struct rproc *rproc;
	char *p, *template = "rproc-%s-fw";
	int name_len;

	if (!dev || !name || !ops)
		return NULL;

	if (!firmware) {
		/*
		 * If the caller didn't pass in a firmware name then
		 * construct a default name.
		 */
		name_len = strlen(name) + strlen(template) - 2 + 1;
		p = kmalloc(name_len, GFP_KERNEL);
		if (!p)
			return NULL;
		snprintf(p, name_len, template, name);
	} else {
		p = kstrdup(firmware, GFP_KERNEL);
		if (!p)
			return NULL;
	}

	rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
	if (!rproc) {
		kfree(p);
		return NULL;
	}

	rproc->ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL);
	if (!rproc->ops) {
		kfree(p);
		kfree(rproc);
		return NULL;
	}

	rproc->firmware = p;
	rproc->name = name;
	rproc->priv = &rproc[1];
	rproc->auto_boot = true;

	device_initialize(&rproc->dev);
	rproc->dev.parent = dev;
	rproc->dev.type = &rproc_type;
	rproc->dev.class = &rproc_class;
	rproc->dev.driver_data = rproc;
	idr_init(&rproc->notifyids);

	/* Assign a unique device index and name */
	rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
	if (rproc->index < 0) {
		dev_err(dev, "ida_simple_get failed: %d\n", rproc->index);
		put_device(&rproc->dev);
		return NULL;
	}

	dev_set_name(&rproc->dev, "remoteproc%d", rproc->index);

	atomic_set(&rproc->power, 0);

	/* Default to ELF loader if no load function is specified */
	if (!rproc->ops->load) {
		rproc->ops->load = rproc_elf_load_segments;
		rproc->ops->parse_fw = rproc_elf_load_rsc_table;
		rproc->ops->find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table;
		rproc->ops->sanity_check = rproc_elf_sanity_check;
		rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;
	}

	mutex_init(&rproc->lock);

	INIT_LIST_HEAD(&rproc->carveouts);
	INIT_LIST_HEAD(&rproc->mappings);
	INIT_LIST_HEAD(&rproc->traces);
	INIT_LIST_HEAD(&rproc->rvdevs);
	INIT_LIST_HEAD(&rproc->subdevs);
	INIT_LIST_HEAD(&rproc->dump_segments);

	INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work);

	rproc->state = RPROC_OFFLINE;

	return rproc;
}
EXPORT_SYMBOL(rproc_alloc);

/**
 * rproc_free() - unroll rproc_alloc()
 * @rproc: the remote processor handle
 *
 * This function decrements the rproc dev refcount.
 *
 * If no one holds any reference to rproc anymore, then its refcount would
 * now drop to zero, and it would be freed.
 */
void rproc_free(struct rproc *rproc)
{
	put_device(&rproc->dev);
}
EXPORT_SYMBOL(rproc_free);

/**
 * rproc_put() - release rproc reference
 * @rproc: the remote processor handle
 *
 * This function decrements the rproc dev refcount.
 *
 * If no one holds any reference to rproc anymore, then its refcount would
 * now drop to zero, and it would be freed.
 */
void rproc_put(struct rproc *rproc)
{
	module_put(rproc->dev.parent->driver->owner);
	put_device(&rproc->dev);
}
EXPORT_SYMBOL(rproc_put);

/**
 * rproc_del() - unregister a remote processor
 * @rproc: rproc handle to unregister
 *
 * This function should be called when the platform specific rproc
 * implementation decides to remove the rproc device. it should
 * _only_ be called if a previous invocation of rproc_add()
 * has completed successfully.
 *
 * After rproc_del() returns, @rproc isn't freed yet, because
 * of the outstanding reference created by rproc_alloc. To decrement that
 * one last refcount, one still needs to call rproc_free().
 *
 * Returns 0 on success and -EINVAL if @rproc isn't valid.
 */
int rproc_del(struct rproc *rproc)
{
	if (!rproc)
		return -EINVAL;

	/* if rproc is marked always-on, rproc_add() booted it */
	/* TODO: make sure this works with rproc->power > 1 */
	if (rproc->auto_boot)
		rproc_shutdown(rproc);

	mutex_lock(&rproc->lock);
	rproc->state = RPROC_DELETED;
	mutex_unlock(&rproc->lock);

	rproc_delete_debug_dir(rproc);

	/* the rproc is downref'ed as soon as it's removed from the klist */
	mutex_lock(&rproc_list_mutex);
	list_del(&rproc->node);
	mutex_unlock(&rproc_list_mutex);

	device_del(&rproc->dev);

	return 0;
}
EXPORT_SYMBOL(rproc_del);

/**
 * rproc_add_subdev() - add a subdevice to a remoteproc
 * @rproc: rproc handle to add the subdevice to
 * @subdev: subdev handle to register
 *
 * Caller is responsible for populating optional subdevice function pointers.
 */
void rproc_add_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
{
	list_add_tail(&subdev->node, &rproc->subdevs);
}
EXPORT_SYMBOL(rproc_add_subdev);

/**
 * rproc_remove_subdev() - remove a subdevice from a remoteproc
 * @rproc: rproc handle to remove the subdevice from
 * @subdev: subdev handle, previously registered with rproc_add_subdev()
 */
void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
{
	list_del(&subdev->node);
}
EXPORT_SYMBOL(rproc_remove_subdev);

/**
 * rproc_get_by_child() - acquire rproc handle of @dev's ancestor
 * @dev:	child device to find ancestor of
 *
 * Returns the ancestor rproc instance, or NULL if not found.
 */
struct rproc *rproc_get_by_child(struct device *dev)
{
	for (dev = dev->parent; dev; dev = dev->parent) {
		if (dev->type == &rproc_type)
			return dev->driver_data;
	}

	return NULL;
}
EXPORT_SYMBOL(rproc_get_by_child);

/**
 * rproc_report_crash() - rproc crash reporter function
 * @rproc: remote processor
 * @type: crash type
 *
 * This function must be called every time a crash is detected by the low-level
 * drivers implementing a specific remoteproc. This should not be called from a
 * non-remoteproc driver.
 *
 * This function can be called from atomic/interrupt context.
 */
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
{
	if (!rproc) {
		pr_err("NULL rproc pointer\n");
		return;
	}

	dev_err(&rproc->dev, "crash detected in %s: type %s\n",
		rproc->name, rproc_crash_to_string(type));

	/* create a new task to handle the error */
	schedule_work(&rproc->crash_handler);
}
EXPORT_SYMBOL(rproc_report_crash);

static int __init remoteproc_init(void)
{
	rproc_init_sysfs();
	rproc_init_debugfs();

	return 0;
}
subsys_initcall(remoteproc_init);

static void __exit remoteproc_exit(void)
{
	ida_destroy(&rproc_dev_index);

	rproc_exit_debugfs();
	rproc_exit_sysfs();
}
module_exit(remoteproc_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Generic Remote Processor Framework");