summaryrefslogtreecommitdiff
path: root/drivers/misc/habanalabs/common/memory.c
blob: ef28f3b37b93216bf9a7b50f296f21fcdff62261 (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
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
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
// SPDX-License-Identifier: GPL-2.0

/*
 * Copyright 2016-2022 HabanaLabs, Ltd.
 * All Rights Reserved.
 */

#include <uapi/misc/habanalabs.h>
#include "habanalabs.h"
#include "../include/hw_ip/mmu/mmu_general.h"

#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/pci-p2pdma.h>

MODULE_IMPORT_NS(DMA_BUF);

#define HL_MMU_DEBUG	0

/* use small pages for supporting non-pow2 (32M/40M/48M) DRAM phys page sizes */
#define DRAM_POOL_PAGE_SIZE SZ_8M

static int allocate_timestamps_buffers(struct hl_fpriv *hpriv,
			struct hl_mem_in *args, u64 *handle);

static int set_alloc_page_size(struct hl_device *hdev, struct hl_mem_in *args, u32 *page_size)
{
	struct asic_fixed_properties *prop = &hdev->asic_prop;
	u64 psize;

	/*
	 * for ASIC that supports setting the allocation page size by user we will address
	 * user's choice only if it is not 0 (as 0 means taking the default page size)
	 */
	if (prop->supports_user_set_page_size && args->alloc.page_size) {
		psize = args->alloc.page_size;

		if (!is_power_of_2(psize)) {
			dev_err(hdev->dev, "user page size (%#llx) is not power of 2\n", psize);
			return -EINVAL;
		}
	} else {
		psize = prop->device_mem_alloc_default_page_size;
	}

	*page_size = psize;

	return 0;
}

/*
 * The va ranges in context object contain a list with the available chunks of
 * device virtual memory.
 * There is one range for host allocations and one for DRAM allocations.
 *
 * On initialization each range contains one chunk of all of its available
 * virtual range which is a half of the total device virtual range.
 *
 * On each mapping of physical pages, a suitable virtual range chunk (with a
 * minimum size) is selected from the list. If the chunk size equals the
 * requested size, the chunk is returned. Otherwise, the chunk is split into
 * two chunks - one to return as result and a remainder to stay in the list.
 *
 * On each Unmapping of a virtual address, the relevant virtual chunk is
 * returned to the list. The chunk is added to the list and if its edges match
 * the edges of the adjacent chunks (means a contiguous chunk can be created),
 * the chunks are merged.
 *
 * On finish, the list is checked to have only one chunk of all the relevant
 * virtual range (which is a half of the device total virtual range).
 * If not (means not all mappings were unmapped), a warning is printed.
 */

/*
 * alloc_device_memory() - allocate device memory.
 * @ctx: pointer to the context structure.
 * @args: host parameters containing the requested size.
 * @ret_handle: result handle.
 *
 * This function does the following:
 * - Allocate the requested size rounded up to 'dram_page_size' pages.
 * - Return unique handle for later map/unmap/free.
 */
static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
				u32 *ret_handle)
{
	struct hl_device *hdev = ctx->hdev;
	struct hl_vm *vm = &hdev->vm;
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	u64 paddr = 0, total_size, num_pgs, i;
	u32 num_curr_pgs, page_size;
	bool contiguous;
	int handle, rc;

	num_curr_pgs = 0;

	rc = set_alloc_page_size(hdev, args, &page_size);
	if (rc)
		return rc;

	num_pgs = DIV_ROUND_UP_ULL(args->alloc.mem_size, page_size);
	total_size = num_pgs * page_size;

	if (!total_size) {
		dev_err(hdev->dev, "Cannot allocate 0 bytes\n");
		return -EINVAL;
	}

	contiguous = args->flags & HL_MEM_CONTIGUOUS;

	if (contiguous) {
		if (is_power_of_2(page_size))
			paddr = (uintptr_t) gen_pool_dma_alloc_align(vm->dram_pg_pool,
								     total_size, NULL, page_size);
		else
			paddr = gen_pool_alloc(vm->dram_pg_pool, total_size);
		if (!paddr) {
			dev_err(hdev->dev,
				"Cannot allocate %llu contiguous pages with total size of %llu\n",
				num_pgs, total_size);
			return -ENOMEM;
		}
	}

	phys_pg_pack = kzalloc(sizeof(*phys_pg_pack), GFP_KERNEL);
	if (!phys_pg_pack) {
		rc = -ENOMEM;
		goto pages_pack_err;
	}

	phys_pg_pack->vm_type = VM_TYPE_PHYS_PACK;
	phys_pg_pack->asid = ctx->asid;
	phys_pg_pack->npages = num_pgs;
	phys_pg_pack->page_size = page_size;
	phys_pg_pack->total_size = total_size;
	phys_pg_pack->flags = args->flags;
	phys_pg_pack->contiguous = contiguous;

	phys_pg_pack->pages = kvmalloc_array(num_pgs, sizeof(u64), GFP_KERNEL);
	if (ZERO_OR_NULL_PTR(phys_pg_pack->pages)) {
		rc = -ENOMEM;
		goto pages_arr_err;
	}

	if (phys_pg_pack->contiguous) {
		for (i = 0 ; i < num_pgs ; i++)
			phys_pg_pack->pages[i] = paddr + i * page_size;
	} else {
		for (i = 0 ; i < num_pgs ; i++) {
			if (is_power_of_2(page_size))
				phys_pg_pack->pages[i] =
					(uintptr_t)gen_pool_dma_alloc_align(vm->dram_pg_pool,
									    page_size, NULL,
									    page_size);
			else
				phys_pg_pack->pages[i] = gen_pool_alloc(vm->dram_pg_pool,
									page_size);

			if (!phys_pg_pack->pages[i]) {
				dev_err(hdev->dev,
					"Cannot allocate device memory (out of memory)\n");
				rc = -ENOMEM;
				goto page_err;
			}

			num_curr_pgs++;
		}
	}

	spin_lock(&vm->idr_lock);
	handle = idr_alloc(&vm->phys_pg_pack_handles, phys_pg_pack, 1, 0,
				GFP_ATOMIC);
	spin_unlock(&vm->idr_lock);

	if (handle < 0) {
		dev_err(hdev->dev, "Failed to get handle for page\n");
		rc = -EFAULT;
		goto idr_err;
	}

	for (i = 0 ; i < num_pgs ; i++)
		kref_get(&vm->dram_pg_pool_refcount);

	phys_pg_pack->handle = handle;

	atomic64_add(phys_pg_pack->total_size, &ctx->dram_phys_mem);
	atomic64_add(phys_pg_pack->total_size, &hdev->dram_used_mem);

	*ret_handle = handle;

	return 0;

idr_err:
page_err:
	if (!phys_pg_pack->contiguous)
		for (i = 0 ; i < num_curr_pgs ; i++)
			gen_pool_free(vm->dram_pg_pool, phys_pg_pack->pages[i],
					page_size);

	kvfree(phys_pg_pack->pages);
pages_arr_err:
	kfree(phys_pg_pack);
pages_pack_err:
	if (contiguous)
		gen_pool_free(vm->dram_pg_pool, paddr, total_size);

	return rc;
}

/**
 * dma_map_host_va() - DMA mapping of the given host virtual address.
 * @hdev: habanalabs device structure.
 * @addr: the host virtual address of the memory area.
 * @size: the size of the memory area.
 * @p_userptr: pointer to result userptr structure.
 *
 * This function does the following:
 * - Allocate userptr structure.
 * - Pin the given host memory using the userptr structure.
 * - Perform DMA mapping to have the DMA addresses of the pages.
 */
static int dma_map_host_va(struct hl_device *hdev, u64 addr, u64 size,
				struct hl_userptr **p_userptr)
{
	struct hl_userptr *userptr;
	int rc;

	userptr = kzalloc(sizeof(*userptr), GFP_KERNEL);
	if (!userptr) {
		rc = -ENOMEM;
		goto userptr_err;
	}

	rc = hl_pin_host_memory(hdev, addr, size, userptr);
	if (rc) {
		dev_err(hdev->dev, "Failed to pin host memory\n");
		goto pin_err;
	}

	userptr->dma_mapped = true;
	userptr->dir = DMA_BIDIRECTIONAL;
	userptr->vm_type = VM_TYPE_USERPTR;

	*p_userptr = userptr;

	rc = hdev->asic_funcs->asic_dma_map_sgtable(hdev, userptr->sgt, DMA_BIDIRECTIONAL);
	if (rc) {
		dev_err(hdev->dev, "failed to map sgt with DMA region\n");
		goto dma_map_err;
	}

	return 0;

dma_map_err:
	hl_unpin_host_memory(hdev, userptr);
pin_err:
	kfree(userptr);
userptr_err:

	return rc;
}

/**
 * dma_unmap_host_va() - DMA unmapping of the given host virtual address.
 * @hdev: habanalabs device structure.
 * @userptr: userptr to free.
 *
 * This function does the following:
 * - Unpins the physical pages.
 * - Frees the userptr structure.
 */
static void dma_unmap_host_va(struct hl_device *hdev,
				struct hl_userptr *userptr)
{
	hl_unpin_host_memory(hdev, userptr);
	kfree(userptr);
}

/**
 * dram_pg_pool_do_release() - free DRAM pages pool
 * @ref: pointer to reference object.
 *
 * This function does the following:
 * - Frees the idr structure of physical pages handles.
 * - Frees the generic pool of DRAM physical pages.
 */
static void dram_pg_pool_do_release(struct kref *ref)
{
	struct hl_vm *vm = container_of(ref, struct hl_vm,
			dram_pg_pool_refcount);

	/*
	 * free the idr here as only here we know for sure that there are no
	 * allocated physical pages and hence there are no handles in use
	 */
	idr_destroy(&vm->phys_pg_pack_handles);
	gen_pool_destroy(vm->dram_pg_pool);
}

/**
 * free_phys_pg_pack() - free physical page pack.
 * @hdev: habanalabs device structure.
 * @phys_pg_pack: physical page pack to free.
 *
 * This function does the following:
 * - For DRAM memory only
 *   - iterate over the pack, free each physical block structure by
 *     returning it to the general pool.
 * - Free the hl_vm_phys_pg_pack structure.
 */
static void free_phys_pg_pack(struct hl_device *hdev,
				struct hl_vm_phys_pg_pack *phys_pg_pack)
{
	struct hl_vm *vm = &hdev->vm;
	u64 i;

	if (phys_pg_pack->created_from_userptr)
		goto end;

	if (phys_pg_pack->contiguous) {
		gen_pool_free(vm->dram_pg_pool, phys_pg_pack->pages[0],
			phys_pg_pack->total_size);

		for (i = 0; i < phys_pg_pack->npages ; i++)
			kref_put(&vm->dram_pg_pool_refcount,
				dram_pg_pool_do_release);
	} else {
		for (i = 0 ; i < phys_pg_pack->npages ; i++) {
			gen_pool_free(vm->dram_pg_pool,
				phys_pg_pack->pages[i],
				phys_pg_pack->page_size);
			kref_put(&vm->dram_pg_pool_refcount,
				dram_pg_pool_do_release);
		}
	}

end:
	kvfree(phys_pg_pack->pages);
	kfree(phys_pg_pack);

	return;
}

/**
 * free_device_memory() - free device memory.
 * @ctx: pointer to the context structure.
 * @args: host parameters containing the requested size.
 *
 * This function does the following:
 * - Free the device memory related to the given handle.
 */
static int free_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args)
{
	struct hl_device *hdev = ctx->hdev;
	struct hl_vm *vm = &hdev->vm;
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	u32 handle = args->free.handle;

	spin_lock(&vm->idr_lock);
	phys_pg_pack = idr_find(&vm->phys_pg_pack_handles, handle);
	if (!phys_pg_pack) {
		spin_unlock(&vm->idr_lock);
		dev_err(hdev->dev, "free device memory failed, no match for handle %u\n", handle);
		return -EINVAL;
	}

	if (atomic_read(&phys_pg_pack->mapping_cnt) > 0) {
		spin_unlock(&vm->idr_lock);
		dev_err(hdev->dev, "handle %u is mapped, cannot free\n", handle);
		return -EINVAL;
	}

	if (phys_pg_pack->exporting_cnt) {
		spin_unlock(&vm->idr_lock);
		dev_dbg(hdev->dev, "handle %u is exported, cannot free\n", handle);
		return -EINVAL;
	}

	/* must remove from idr before the freeing of the physical pages as the refcount of the pool
	 * is also the trigger of the idr destroy
	 */
	idr_remove(&vm->phys_pg_pack_handles, handle);
	spin_unlock(&vm->idr_lock);

	atomic64_sub(phys_pg_pack->total_size, &ctx->dram_phys_mem);
	atomic64_sub(phys_pg_pack->total_size, &hdev->dram_used_mem);

	free_phys_pg_pack(hdev, phys_pg_pack);

	return 0;
}

/**
 * clear_va_list_locked() - free virtual addresses list.
 * @hdev: habanalabs device structure.
 * @va_list: list of virtual addresses to free.
 *
 * This function does the following:
 * - Iterate over the list and free each virtual addresses block.
 *
 * This function should be called only when va_list lock is taken.
 */
static void clear_va_list_locked(struct hl_device *hdev,
		struct list_head *va_list)
{
	struct hl_vm_va_block *va_block, *tmp;

	list_for_each_entry_safe(va_block, tmp, va_list, node) {
		list_del(&va_block->node);
		kfree(va_block);
	}
}

/**
 * print_va_list_locked() - print virtual addresses list.
 * @hdev: habanalabs device structure.
 * @va_list: list of virtual addresses to print.
 *
 * This function does the following:
 * - Iterate over the list and print each virtual addresses block.
 *
 * This function should be called only when va_list lock is taken.
 */
static void print_va_list_locked(struct hl_device *hdev,
		struct list_head *va_list)
{
#if HL_MMU_DEBUG
	struct hl_vm_va_block *va_block;

	dev_dbg(hdev->dev, "print va list:\n");

	list_for_each_entry(va_block, va_list, node)
		dev_dbg(hdev->dev,
			"va block, start: 0x%llx, end: 0x%llx, size: %llu\n",
			va_block->start, va_block->end, va_block->size);
#endif
}

/**
 * merge_va_blocks_locked() - merge a virtual block if possible.
 * @hdev: pointer to the habanalabs device structure.
 * @va_list: pointer to the virtual addresses block list.
 * @va_block: virtual block to merge with adjacent blocks.
 *
 * This function does the following:
 * - Merge the given blocks with the adjacent blocks if their virtual ranges
 *   create a contiguous virtual range.
 *
 * This Function should be called only when va_list lock is taken.
 */
static void merge_va_blocks_locked(struct hl_device *hdev,
		struct list_head *va_list, struct hl_vm_va_block *va_block)
{
	struct hl_vm_va_block *prev, *next;

	prev = list_prev_entry(va_block, node);
	if (&prev->node != va_list && prev->end + 1 == va_block->start) {
		prev->end = va_block->end;
		prev->size = prev->end - prev->start + 1;
		list_del(&va_block->node);
		kfree(va_block);
		va_block = prev;
	}

	next = list_next_entry(va_block, node);
	if (&next->node != va_list && va_block->end + 1 == next->start) {
		next->start = va_block->start;
		next->size = next->end - next->start + 1;
		list_del(&va_block->node);
		kfree(va_block);
	}
}

/**
 * add_va_block_locked() - add a virtual block to the virtual addresses list.
 * @hdev: pointer to the habanalabs device structure.
 * @va_list: pointer to the virtual addresses block list.
 * @start: start virtual address.
 * @end: end virtual address.
 *
 * This function does the following:
 * - Add the given block to the virtual blocks list and merge with other blocks
 *   if a contiguous virtual block can be created.
 *
 * This Function should be called only when va_list lock is taken.
 */
static int add_va_block_locked(struct hl_device *hdev,
		struct list_head *va_list, u64 start, u64 end)
{
	struct hl_vm_va_block *va_block, *res = NULL;
	u64 size = end - start + 1;

	print_va_list_locked(hdev, va_list);

	list_for_each_entry(va_block, va_list, node) {
		/* TODO: remove upon matureness */
		if (hl_mem_area_crosses_range(start, size, va_block->start,
				va_block->end)) {
			dev_err(hdev->dev,
				"block crossing ranges at start 0x%llx, end 0x%llx\n",
				va_block->start, va_block->end);
			return -EINVAL;
		}

		if (va_block->end < start)
			res = va_block;
	}

	va_block = kmalloc(sizeof(*va_block), GFP_KERNEL);
	if (!va_block)
		return -ENOMEM;

	va_block->start = start;
	va_block->end = end;
	va_block->size = size;

	if (!res)
		list_add(&va_block->node, va_list);
	else
		list_add(&va_block->node, &res->node);

	merge_va_blocks_locked(hdev, va_list, va_block);

	print_va_list_locked(hdev, va_list);

	return 0;
}

/**
 * add_va_block() - wrapper for add_va_block_locked.
 * @hdev: pointer to the habanalabs device structure.
 * @va_range: pointer to the virtual addresses range object.
 * @start: start virtual address.
 * @end: end virtual address.
 *
 * This function does the following:
 * - Takes the list lock and calls add_va_block_locked.
 */
static inline int add_va_block(struct hl_device *hdev,
		struct hl_va_range *va_range, u64 start, u64 end)
{
	int rc;

	mutex_lock(&va_range->lock);
	rc = add_va_block_locked(hdev, &va_range->list, start, end);
	mutex_unlock(&va_range->lock);

	return rc;
}

/**
 * is_hint_crossing_range() - check if hint address crossing specified reserved.
 * @range_type: virtual space range type.
 * @start_addr: start virtual address.
 * @size: block size.
 * @prop: asic properties structure to retrieve reserved ranges from.
 */
static inline bool is_hint_crossing_range(enum hl_va_range_type range_type,
		u64 start_addr, u32 size, struct asic_fixed_properties *prop) {
	bool range_cross;

	if (range_type == HL_VA_RANGE_TYPE_DRAM)
		range_cross =
			hl_mem_area_crosses_range(start_addr, size,
			prop->hints_dram_reserved_va_range.start_addr,
			prop->hints_dram_reserved_va_range.end_addr);
	else if (range_type == HL_VA_RANGE_TYPE_HOST)
		range_cross =
			hl_mem_area_crosses_range(start_addr,	size,
			prop->hints_host_reserved_va_range.start_addr,
			prop->hints_host_reserved_va_range.end_addr);
	else
		range_cross =
			hl_mem_area_crosses_range(start_addr, size,
			prop->hints_host_hpage_reserved_va_range.start_addr,
			prop->hints_host_hpage_reserved_va_range.end_addr);

	return range_cross;
}

/**
 * get_va_block() - get a virtual block for the given size and alignment.
 *
 * @hdev: pointer to the habanalabs device structure.
 * @va_range: pointer to the virtual addresses range.
 * @size: requested block size.
 * @hint_addr: hint for requested address by the user.
 * @va_block_align: required alignment of the virtual block start address.
 * @range_type: va range type (host, dram)
 * @flags: additional memory flags, currently only uses HL_MEM_FORCE_HINT
 *
 * This function does the following:
 * - Iterate on the virtual block list to find a suitable virtual block for the
 *   given size, hint address and alignment.
 * - Reserve the requested block and update the list.
 * - Return the start address of the virtual block.
 */
static u64 get_va_block(struct hl_device *hdev,
				struct hl_va_range *va_range,
				u64 size, u64 hint_addr, u32 va_block_align,
				enum hl_va_range_type range_type,
				u32 flags)
{
	struct hl_vm_va_block *va_block, *new_va_block = NULL;
	struct asic_fixed_properties *prop = &hdev->asic_prop;
	u64 tmp_hint_addr, valid_start, valid_size, prev_start, prev_end,
		align_mask, reserved_valid_start = 0, reserved_valid_size = 0,
		dram_hint_mask = prop->dram_hints_align_mask;
	bool add_prev = false;
	bool is_align_pow_2  = is_power_of_2(va_range->page_size);
	bool is_hint_dram_addr = hl_is_dram_va(hdev, hint_addr);
	bool force_hint = flags & HL_MEM_FORCE_HINT;

	if (is_align_pow_2)
		align_mask = ~((u64)va_block_align - 1);
	else
		/*
		 * with non-power-of-2 range we work only with page granularity
		 * and the start address is page aligned,
		 * so no need for alignment checking.
		 */
		size = DIV_ROUND_UP_ULL(size, va_range->page_size) *
							va_range->page_size;

	tmp_hint_addr = hint_addr & ~dram_hint_mask;

	/* Check if we need to ignore hint address */
	if ((is_align_pow_2 && (hint_addr & (va_block_align - 1))) ||
			(!is_align_pow_2 && is_hint_dram_addr &&
			do_div(tmp_hint_addr, va_range->page_size))) {

		if (force_hint) {
			/* Hint must be respected, so here we just fail */
			dev_err(hdev->dev,
				"Hint address 0x%llx is not page aligned - cannot be respected\n",
				hint_addr);
			return 0;
		}

		dev_dbg(hdev->dev,
			"Hint address 0x%llx will be ignored because it is not aligned\n",
			hint_addr);
		hint_addr = 0;
	}

	mutex_lock(&va_range->lock);

	print_va_list_locked(hdev, &va_range->list);

	list_for_each_entry(va_block, &va_range->list, node) {
		/* Calc the first possible aligned addr */
		valid_start = va_block->start;

		if (is_align_pow_2 && (valid_start & (va_block_align - 1))) {
			valid_start &= align_mask;
			valid_start += va_block_align;
			if (valid_start > va_block->end)
				continue;
		}

		valid_size = va_block->end - valid_start + 1;
		if (valid_size < size)
			continue;

		/*
		 * In case hint address is 0, and hints_range_reservation
		 * property enabled, then avoid allocating va blocks from the
		 * range reserved for hint addresses
		 */
		if (prop->hints_range_reservation && !hint_addr)
			if (is_hint_crossing_range(range_type, valid_start,
					size, prop))
				continue;

		/* Pick the minimal length block which has the required size */
		if (!new_va_block || (valid_size < reserved_valid_size)) {
			new_va_block = va_block;
			reserved_valid_start = valid_start;
			reserved_valid_size = valid_size;
		}

		if (hint_addr && hint_addr >= valid_start &&
					(hint_addr + size) <= va_block->end) {
			new_va_block = va_block;
			reserved_valid_start = hint_addr;
			reserved_valid_size = valid_size;
			break;
		}
	}

	if (!new_va_block) {
		dev_err(hdev->dev, "no available va block for size %llu\n",
								size);
		goto out;
	}

	if (force_hint && reserved_valid_start != hint_addr) {
		/* Hint address must be respected. If we are here - this means
		 * we could not respect it.
		 */
		dev_err(hdev->dev,
			"Hint address 0x%llx could not be respected\n",
			hint_addr);
		reserved_valid_start = 0;
		goto out;
	}

	/*
	 * Check if there is some leftover range due to reserving the new
	 * va block, then return it to the main virtual addresses list.
	 */
	if (reserved_valid_start > new_va_block->start) {
		prev_start = new_va_block->start;
		prev_end = reserved_valid_start - 1;

		new_va_block->start = reserved_valid_start;
		new_va_block->size = reserved_valid_size;

		add_prev = true;
	}

	if (new_va_block->size > size) {
		new_va_block->start += size;
		new_va_block->size = new_va_block->end - new_va_block->start + 1;
	} else {
		list_del(&new_va_block->node);
		kfree(new_va_block);
	}

	if (add_prev)
		add_va_block_locked(hdev, &va_range->list, prev_start,
				prev_end);

	print_va_list_locked(hdev, &va_range->list);
out:
	mutex_unlock(&va_range->lock);

	return reserved_valid_start;
}

/*
 * hl_reserve_va_block() - reserve a virtual block of a given size.
 * @hdev: pointer to the habanalabs device structure.
 * @ctx: current context
 * @type: virtual addresses range type.
 * @size: requested block size.
 * @alignment: required alignment in bytes of the virtual block start address,
 *             0 means no alignment.
 *
 * This function does the following:
 * - Iterate on the virtual block list to find a suitable virtual block for the
 *   given size and alignment.
 * - Reserve the requested block and update the list.
 * - Return the start address of the virtual block.
 */
u64 hl_reserve_va_block(struct hl_device *hdev, struct hl_ctx *ctx,
		enum hl_va_range_type type, u64 size, u32 alignment)
{
	return get_va_block(hdev, ctx->va_range[type], size, 0,
			max(alignment, ctx->va_range[type]->page_size),
			type, 0);
}

/**
 * hl_get_va_range_type() - get va_range type for the given address and size.
 * @ctx: context to fetch va_range from.
 * @address: the start address of the area we want to validate.
 * @size: the size in bytes of the area we want to validate.
 * @type: returned va_range type.
 *
 * Return: true if the area is inside a valid range, false otherwise.
 */
static int hl_get_va_range_type(struct hl_ctx *ctx, u64 address, u64 size,
			enum hl_va_range_type *type)
{
	int i;

	for (i = 0 ; i < HL_VA_RANGE_TYPE_MAX; i++) {
		if (hl_mem_area_inside_range(address, size,
				ctx->va_range[i]->start_addr,
				ctx->va_range[i]->end_addr)) {
			*type = i;
			return 0;
		}
	}

	return -EINVAL;
}

/**
 * hl_unreserve_va_block() - wrapper for add_va_block to unreserve a va block.
 * @hdev: pointer to the habanalabs device structure
 * @ctx: pointer to the context structure.
 * @start_addr: start virtual address.
 * @size: number of bytes to unreserve.
 *
 * This function does the following:
 * - Takes the list lock and calls add_va_block_locked.
 */
int hl_unreserve_va_block(struct hl_device *hdev, struct hl_ctx *ctx,
		u64 start_addr, u64 size)
{
	enum hl_va_range_type type;
	int rc;

	rc = hl_get_va_range_type(ctx, start_addr, size, &type);
	if (rc) {
		dev_err(hdev->dev,
			"cannot find va_range for va %#llx size %llu",
			start_addr, size);
		return rc;
	}

	rc = add_va_block(hdev, ctx->va_range[type], start_addr,
						start_addr + size - 1);
	if (rc)
		dev_warn(hdev->dev,
			"add va block failed for vaddr: 0x%llx\n", start_addr);

	return rc;
}

/**
 * init_phys_pg_pack_from_userptr() - initialize physical page pack from host
 *                                    memory
 * @ctx: pointer to the context structure.
 * @userptr: userptr to initialize from.
 * @pphys_pg_pack: result pointer.
 * @force_regular_page: tell the function to ignore huge page optimization,
 *                      even if possible. Needed for cases where the device VA
 *                      is allocated before we know the composition of the
 *                      physical pages
 *
 * This function does the following:
 * - Pin the physical pages related to the given virtual block.
 * - Create a physical page pack from the physical pages related to the given
 *   virtual block.
 */
static int init_phys_pg_pack_from_userptr(struct hl_ctx *ctx,
				struct hl_userptr *userptr,
				struct hl_vm_phys_pg_pack **pphys_pg_pack,
				bool force_regular_page)
{
	u32 npages, page_size = PAGE_SIZE,
		huge_page_size = ctx->hdev->asic_prop.pmmu_huge.page_size;
	u32 pgs_in_huge_page = huge_page_size >> __ffs(page_size);
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	bool first = true, is_huge_page_opt;
	u64 page_mask, total_npages;
	struct scatterlist *sg;
	dma_addr_t dma_addr;
	int rc, i, j;

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

	phys_pg_pack->vm_type = userptr->vm_type;
	phys_pg_pack->created_from_userptr = true;
	phys_pg_pack->asid = ctx->asid;
	atomic_set(&phys_pg_pack->mapping_cnt, 1);

	is_huge_page_opt = (force_regular_page ? false : true);

	/* Only if all dma_addrs are aligned to 2MB and their
	 * sizes is at least 2MB, we can use huge page mapping.
	 * We limit the 2MB optimization to this condition,
	 * since later on we acquire the related VA range as one
	 * consecutive block.
	 */
	total_npages = 0;
	for_each_sgtable_dma_sg(userptr->sgt, sg, i) {
		npages = hl_get_sg_info(sg, &dma_addr);

		total_npages += npages;

		if ((npages % pgs_in_huge_page) ||
					(dma_addr & (huge_page_size - 1)))
			is_huge_page_opt = false;
	}

	if (is_huge_page_opt) {
		page_size = huge_page_size;
		do_div(total_npages, pgs_in_huge_page);
	}

	page_mask = ~(((u64) page_size) - 1);

	phys_pg_pack->pages = kvmalloc_array(total_npages, sizeof(u64),
						GFP_KERNEL);
	if (ZERO_OR_NULL_PTR(phys_pg_pack->pages)) {
		rc = -ENOMEM;
		goto page_pack_arr_mem_err;
	}

	phys_pg_pack->npages = total_npages;
	phys_pg_pack->page_size = page_size;
	phys_pg_pack->total_size = total_npages * page_size;

	j = 0;
	for_each_sgtable_dma_sg(userptr->sgt, sg, i) {
		npages = hl_get_sg_info(sg, &dma_addr);

		/* align down to physical page size and save the offset */
		if (first) {
			first = false;
			phys_pg_pack->offset = dma_addr & (page_size - 1);
			dma_addr &= page_mask;
		}

		while (npages) {
			phys_pg_pack->pages[j++] = dma_addr;
			dma_addr += page_size;

			if (is_huge_page_opt)
				npages -= pgs_in_huge_page;
			else
				npages--;
		}
	}

	*pphys_pg_pack = phys_pg_pack;

	return 0;

page_pack_arr_mem_err:
	kfree(phys_pg_pack);

	return rc;
}

/**
 * map_phys_pg_pack() - maps the physical page pack..
 * @ctx: pointer to the context structure.
 * @vaddr: start address of the virtual area to map from.
 * @phys_pg_pack: the pack of physical pages to map to.
 *
 * This function does the following:
 * - Maps each chunk of virtual memory to matching physical chunk.
 * - Stores number of successful mappings in the given argument.
 * - Returns 0 on success, error code otherwise.
 */
static int map_phys_pg_pack(struct hl_ctx *ctx, u64 vaddr,
				struct hl_vm_phys_pg_pack *phys_pg_pack)
{
	struct hl_device *hdev = ctx->hdev;
	u64 next_vaddr = vaddr, paddr, mapped_pg_cnt = 0, i;
	u32 page_size = phys_pg_pack->page_size;
	int rc = 0;
	bool is_host_addr;

	for (i = 0 ; i < phys_pg_pack->npages ; i++) {
		paddr = phys_pg_pack->pages[i];

		rc = hl_mmu_map_page(ctx, next_vaddr, paddr, page_size,
				(i + 1) == phys_pg_pack->npages);
		if (rc) {
			dev_err(hdev->dev,
				"map failed for handle %u, npages: %llu, mapped: %llu",
				phys_pg_pack->handle, phys_pg_pack->npages,
				mapped_pg_cnt);
			goto err;
		}

		mapped_pg_cnt++;
		next_vaddr += page_size;
	}

	return 0;

err:
	is_host_addr = !hl_is_dram_va(hdev, vaddr);

	next_vaddr = vaddr;
	for (i = 0 ; i < mapped_pg_cnt ; i++) {
		if (hl_mmu_unmap_page(ctx, next_vaddr, page_size,
					(i + 1) == mapped_pg_cnt))
			dev_warn_ratelimited(hdev->dev,
				"failed to unmap handle %u, va: 0x%llx, pa: 0x%llx, page size: %u\n",
					phys_pg_pack->handle, next_vaddr,
					phys_pg_pack->pages[i], page_size);

		next_vaddr += page_size;

		/*
		 * unmapping on Palladium can be really long, so avoid a CPU
		 * soft lockup bug by sleeping a little between unmapping pages
		 *
		 * In addition, on host num of pages could be huge,
		 * because page size could be 4KB, so when unmapping host
		 * pages sleep every 32K pages to avoid soft lockup
		 */
		if (hdev->pldm || (is_host_addr && (i & 0x7FFF) == 0))
			usleep_range(50, 200);
	}

	return rc;
}

/**
 * unmap_phys_pg_pack() - unmaps the physical page pack.
 * @ctx: pointer to the context structure.
 * @vaddr: start address of the virtual area to unmap.
 * @phys_pg_pack: the pack of physical pages to unmap.
 */
static void unmap_phys_pg_pack(struct hl_ctx *ctx, u64 vaddr,
				struct hl_vm_phys_pg_pack *phys_pg_pack)
{
	struct hl_device *hdev = ctx->hdev;
	u64 next_vaddr, i;
	bool is_host_addr;
	u32 page_size;

	is_host_addr = !hl_is_dram_va(hdev, vaddr);
	page_size = phys_pg_pack->page_size;
	next_vaddr = vaddr;

	for (i = 0 ; i < phys_pg_pack->npages ; i++, next_vaddr += page_size) {
		if (hl_mmu_unmap_page(ctx, next_vaddr, page_size,
				       (i + 1) == phys_pg_pack->npages))
			dev_warn_ratelimited(hdev->dev,
			"unmap failed for vaddr: 0x%llx\n", next_vaddr);

		/*
		 * unmapping on Palladium can be really long, so avoid a CPU
		 * soft lockup bug by sleeping a little between unmapping pages
		 *
		 * In addition, on host num of pages could be huge,
		 * because page size could be 4KB, so when unmapping host
		 * pages sleep every 32K pages to avoid soft lockup
		 */
		if (hdev->pldm || (is_host_addr && (i & 0x7FFF) == 0))
			usleep_range(50, 200);
	}
}

static int get_paddr_from_handle(struct hl_ctx *ctx, struct hl_mem_in *args,
					u64 *paddr)
{
	struct hl_device *hdev = ctx->hdev;
	struct hl_vm *vm = &hdev->vm;
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	u32 handle;

	handle = lower_32_bits(args->map_device.handle);
	spin_lock(&vm->idr_lock);
	phys_pg_pack = idr_find(&vm->phys_pg_pack_handles, handle);
	if (!phys_pg_pack) {
		spin_unlock(&vm->idr_lock);
		dev_err(hdev->dev, "no match for handle %u\n", handle);
		return -EINVAL;
	}

	*paddr = phys_pg_pack->pages[0];

	spin_unlock(&vm->idr_lock);

	return 0;
}

/**
 * map_device_va() - map the given memory.
 * @ctx: pointer to the context structure.
 * @args: host parameters with handle/host virtual address.
 * @device_addr: pointer to result device virtual address.
 *
 * This function does the following:
 * - If given a physical device memory handle, map to a device virtual block
 *   and return the start address of this block.
 * - If given a host virtual address and size, find the related physical pages,
 *   map a device virtual block to this pages and return the start address of
 *   this block.
 */
static int map_device_va(struct hl_ctx *ctx, struct hl_mem_in *args, u64 *device_addr)
{
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	enum hl_va_range_type va_range_type = 0;
	struct hl_device *hdev = ctx->hdev;
	struct hl_userptr *userptr = NULL;
	u32 handle = 0, va_block_align;
	struct hl_vm_hash_node *hnode;
	struct hl_vm *vm = &hdev->vm;
	struct hl_va_range *va_range;
	bool is_userptr, do_prefetch;
	u64 ret_vaddr, hint_addr;
	enum vm_type *vm_type;
	int rc;

	/* set map flags */
	is_userptr = args->flags & HL_MEM_USERPTR;
	do_prefetch = hdev->supports_mmu_prefetch && (args->flags & HL_MEM_PREFETCH);

	/* Assume failure */
	*device_addr = 0;

	if (is_userptr) {
		u64 addr = args->map_host.host_virt_addr,
			size = args->map_host.mem_size;
		u32 page_size = hdev->asic_prop.pmmu.page_size,
			huge_page_size = hdev->asic_prop.pmmu_huge.page_size;

		rc = dma_map_host_va(hdev, addr, size, &userptr);
		if (rc) {
			dev_err(hdev->dev, "failed to get userptr from va\n");
			return rc;
		}

		rc = init_phys_pg_pack_from_userptr(ctx, userptr,
				&phys_pg_pack, false);
		if (rc) {
			dev_err(hdev->dev,
				"unable to init page pack for vaddr 0x%llx\n",
				addr);
			goto init_page_pack_err;
		}

		vm_type = (enum vm_type *) userptr;
		hint_addr = args->map_host.hint_addr;
		handle = phys_pg_pack->handle;

		/* get required alignment */
		if (phys_pg_pack->page_size == page_size) {
			va_range = ctx->va_range[HL_VA_RANGE_TYPE_HOST];
			va_range_type = HL_VA_RANGE_TYPE_HOST;
			/*
			 * huge page alignment may be needed in case of regular
			 * page mapping, depending on the host VA alignment
			 */
			if (addr & (huge_page_size - 1))
				va_block_align = page_size;
			else
				va_block_align = huge_page_size;
		} else {
			/*
			 * huge page alignment is needed in case of huge page
			 * mapping
			 */
			va_range = ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE];
			va_range_type = HL_VA_RANGE_TYPE_HOST_HUGE;
			va_block_align = huge_page_size;
		}
	} else {
		handle = lower_32_bits(args->map_device.handle);

		spin_lock(&vm->idr_lock);
		phys_pg_pack = idr_find(&vm->phys_pg_pack_handles, handle);
		if (!phys_pg_pack) {
			spin_unlock(&vm->idr_lock);
			dev_err(hdev->dev,
				"no match for handle %u\n", handle);
			return -EINVAL;
		}

		/* increment now to avoid freeing device memory while mapping */
		atomic_inc(&phys_pg_pack->mapping_cnt);

		spin_unlock(&vm->idr_lock);

		vm_type = (enum vm_type *) phys_pg_pack;

		hint_addr = args->map_device.hint_addr;

		/* DRAM VA alignment is the same as the MMU page size */
		va_range = ctx->va_range[HL_VA_RANGE_TYPE_DRAM];
		va_range_type = HL_VA_RANGE_TYPE_DRAM;
		va_block_align = hdev->asic_prop.dmmu.page_size;
	}

	/*
	 * relevant for mapping device physical memory only, as host memory is
	 * implicitly shared
	 */
	if (!is_userptr && !(phys_pg_pack->flags & HL_MEM_SHARED) &&
			phys_pg_pack->asid != ctx->asid) {
		dev_err(hdev->dev,
			"Failed to map memory, handle %u is not shared\n",
			handle);
		rc = -EPERM;
		goto shared_err;
	}

	hnode = kzalloc(sizeof(*hnode), GFP_KERNEL);
	if (!hnode) {
		rc = -ENOMEM;
		goto hnode_err;
	}

	if (hint_addr && phys_pg_pack->offset) {
		if (args->flags & HL_MEM_FORCE_HINT) {
			/* Fail if hint must be respected but it can't be */
			dev_err(hdev->dev,
				"Hint address 0x%llx cannot be respected because source memory is not aligned 0x%x\n",
				hint_addr, phys_pg_pack->offset);
			rc = -EINVAL;
			goto va_block_err;
		}
		dev_dbg(hdev->dev,
			"Hint address 0x%llx will be ignored because source memory is not aligned 0x%x\n",
			hint_addr, phys_pg_pack->offset);
	}

	ret_vaddr = get_va_block(hdev, va_range, phys_pg_pack->total_size,
					hint_addr, va_block_align,
					va_range_type, args->flags);
	if (!ret_vaddr) {
		dev_err(hdev->dev, "no available va block for handle %u\n",
				handle);
		rc = -ENOMEM;
		goto va_block_err;
	}

	mutex_lock(&hdev->mmu_lock);

	rc = map_phys_pg_pack(ctx, ret_vaddr, phys_pg_pack);
	if (rc) {
		dev_err(hdev->dev, "mapping page pack failed for handle %u\n", handle);
		mutex_unlock(&hdev->mmu_lock);
		goto map_err;
	}

	rc = hl_mmu_invalidate_cache_range(hdev, false, *vm_type | MMU_OP_SKIP_LOW_CACHE_INV,
				ctx->asid, ret_vaddr, phys_pg_pack->total_size);
	mutex_unlock(&hdev->mmu_lock);
	if (rc)
		goto map_err;

	/*
	 * prefetch is done upon user's request. it is performed in WQ as and so can
	 * be outside the MMU lock. the operation itself is already protected by the mmu lock
	 */
	if (do_prefetch) {
		rc = hl_mmu_prefetch_cache_range(ctx, *vm_type, ctx->asid, ret_vaddr,
							phys_pg_pack->total_size);
		if (rc)
			goto map_err;
	}

	ret_vaddr += phys_pg_pack->offset;

	hnode->ptr = vm_type;
	hnode->vaddr = ret_vaddr;

	mutex_lock(&ctx->mem_hash_lock);
	hash_add(ctx->mem_hash, &hnode->node, ret_vaddr);
	mutex_unlock(&ctx->mem_hash_lock);

	*device_addr = ret_vaddr;

	if (is_userptr)
		free_phys_pg_pack(hdev, phys_pg_pack);

	return rc;

map_err:
	if (add_va_block(hdev, va_range, ret_vaddr,
				ret_vaddr + phys_pg_pack->total_size - 1))
		dev_warn(hdev->dev,
			"release va block failed for handle 0x%x, vaddr: 0x%llx\n",
				handle, ret_vaddr);

va_block_err:
	kfree(hnode);
hnode_err:
shared_err:
	atomic_dec(&phys_pg_pack->mapping_cnt);
	if (is_userptr)
		free_phys_pg_pack(hdev, phys_pg_pack);
init_page_pack_err:
	if (is_userptr)
		dma_unmap_host_va(hdev, userptr);

	return rc;
}

/**
 * unmap_device_va() - unmap the given device virtual address.
 * @ctx: pointer to the context structure.
 * @args: host parameters with device virtual address to unmap.
 * @ctx_free: true if in context free flow, false otherwise.
 *
 * This function does the following:
 * - unmap the physical pages related to the given virtual address.
 * - return the device virtual block to the virtual block list.
 */
static int unmap_device_va(struct hl_ctx *ctx, struct hl_mem_in *args,
				bool ctx_free)
{
	struct hl_vm_phys_pg_pack *phys_pg_pack = NULL;
	u64 vaddr = args->unmap.device_virt_addr;
	struct hl_vm_hash_node *hnode = NULL;
	struct asic_fixed_properties *prop;
	struct hl_device *hdev = ctx->hdev;
	struct hl_userptr *userptr = NULL;
	struct hl_va_range *va_range;
	enum vm_type *vm_type;
	bool is_userptr;
	int rc = 0;

	prop = &hdev->asic_prop;

	/* protect from double entrance */
	mutex_lock(&ctx->mem_hash_lock);
	hash_for_each_possible(ctx->mem_hash, hnode, node, (unsigned long)vaddr)
		if (vaddr == hnode->vaddr)
			break;

	if (!hnode) {
		mutex_unlock(&ctx->mem_hash_lock);
		dev_err(hdev->dev,
			"unmap failed, no mem hnode for vaddr 0x%llx\n",
			vaddr);
		return -EINVAL;
	}

	hash_del(&hnode->node);
	mutex_unlock(&ctx->mem_hash_lock);

	vm_type = hnode->ptr;

	if (*vm_type == VM_TYPE_USERPTR) {
		is_userptr = true;
		userptr = hnode->ptr;

		rc = init_phys_pg_pack_from_userptr(ctx, userptr, &phys_pg_pack,
							false);
		if (rc) {
			dev_err(hdev->dev,
				"unable to init page pack for vaddr 0x%llx\n",
				vaddr);
			goto vm_type_err;
		}

		if (phys_pg_pack->page_size ==
					hdev->asic_prop.pmmu.page_size)
			va_range = ctx->va_range[HL_VA_RANGE_TYPE_HOST];
		else
			va_range = ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE];
	} else if (*vm_type == VM_TYPE_PHYS_PACK) {
		is_userptr = false;
		va_range = ctx->va_range[HL_VA_RANGE_TYPE_DRAM];
		phys_pg_pack = hnode->ptr;
	} else {
		dev_warn(hdev->dev,
			"unmap failed, unknown vm desc for vaddr 0x%llx\n",
				vaddr);
		rc = -EFAULT;
		goto vm_type_err;
	}

	if (atomic_read(&phys_pg_pack->mapping_cnt) == 0) {
		dev_err(hdev->dev, "vaddr 0x%llx is not mapped\n", vaddr);
		rc = -EINVAL;
		goto mapping_cnt_err;
	}

	if (!is_userptr && !is_power_of_2(phys_pg_pack->page_size))
		vaddr = prop->dram_base_address +
			DIV_ROUND_DOWN_ULL(vaddr - prop->dram_base_address,
						phys_pg_pack->page_size) *
							phys_pg_pack->page_size;
	else
		vaddr &= ~(((u64) phys_pg_pack->page_size) - 1);

	mutex_lock(&hdev->mmu_lock);

	unmap_phys_pg_pack(ctx, vaddr, phys_pg_pack);

	/*
	 * During context free this function is called in a loop to clean all
	 * the context mappings. Hence the cache invalidation can be called once
	 * at the loop end rather than for each iteration
	 */
	if (!ctx_free)
		rc = hl_mmu_invalidate_cache_range(hdev, true, *vm_type, ctx->asid, vaddr,
							phys_pg_pack->total_size);

	mutex_unlock(&hdev->mmu_lock);

	/*
	 * If the context is closing we don't need to check for the MMU cache
	 * invalidation return code and update the VA free list as in this flow
	 * we invalidate the MMU cache outside of this unmap function and the VA
	 * free list will be freed anyway.
	 */
	if (!ctx_free) {
		int tmp_rc;

		tmp_rc = add_va_block(hdev, va_range, vaddr,
					vaddr + phys_pg_pack->total_size - 1);
		if (tmp_rc) {
			dev_warn(hdev->dev,
					"add va block failed for vaddr: 0x%llx\n",
					vaddr);
			if (!rc)
				rc = tmp_rc;
		}
	}

	atomic_dec(&phys_pg_pack->mapping_cnt);
	kfree(hnode);

	if (is_userptr) {
		free_phys_pg_pack(hdev, phys_pg_pack);
		dma_unmap_host_va(hdev, userptr);
	}

	return rc;

mapping_cnt_err:
	if (is_userptr)
		free_phys_pg_pack(hdev, phys_pg_pack);
vm_type_err:
	mutex_lock(&ctx->mem_hash_lock);
	hash_add(ctx->mem_hash, &hnode->node, vaddr);
	mutex_unlock(&ctx->mem_hash_lock);

	return rc;
}

static int map_block(struct hl_device *hdev, u64 address, u64 *handle, u32 *size)
{
	u32 block_id;
	int rc;

	*handle = 0;
	if (size)
		*size = 0;

	rc = hdev->asic_funcs->get_hw_block_id(hdev, address, size, &block_id);
	if (rc)
		return rc;

	*handle = block_id | HL_MMAP_TYPE_BLOCK;
	*handle <<= PAGE_SHIFT;

	return 0;
}

static void hw_block_vm_close(struct vm_area_struct *vma)
{
	struct hl_vm_hw_block_list_node *lnode =
		(struct hl_vm_hw_block_list_node *) vma->vm_private_data;
	struct hl_ctx *ctx = lnode->ctx;
	long new_mmap_size;

	new_mmap_size = lnode->mapped_size - (vma->vm_end - vma->vm_start);
	if (new_mmap_size > 0) {
		lnode->mapped_size = new_mmap_size;
		return;
	}

	mutex_lock(&ctx->hw_block_list_lock);
	list_del(&lnode->node);
	mutex_unlock(&ctx->hw_block_list_lock);
	hl_ctx_put(ctx);
	kfree(lnode);
	vma->vm_private_data = NULL;
}

static const struct vm_operations_struct hw_block_vm_ops = {
	.close = hw_block_vm_close
};

/**
 * hl_hw_block_mmap() - mmap a hw block to user.
 * @hpriv: pointer to the private data of the fd
 * @vma: pointer to vm_area_struct of the process
 *
 * Driver increments context reference for every HW block mapped in order
 * to prevent user from closing FD without unmapping first
 */
int hl_hw_block_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
{
	struct hl_vm_hw_block_list_node *lnode;
	struct hl_device *hdev = hpriv->hdev;
	struct hl_ctx *ctx = hpriv->ctx;
	u32 block_id, block_size;
	int rc;

	/* We use the page offset to hold the block id and thus we need to clear
	 * it before doing the mmap itself
	 */
	block_id = vma->vm_pgoff;
	vma->vm_pgoff = 0;

	/* Driver only allows mapping of a complete HW block */
	block_size = vma->vm_end - vma->vm_start;

	if (!access_ok((void __user *) (uintptr_t) vma->vm_start, block_size)) {
		dev_err(hdev->dev,
			"user pointer is invalid - 0x%lx\n",
			vma->vm_start);

		return -EINVAL;
	}

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

	rc = hdev->asic_funcs->hw_block_mmap(hdev, vma, block_id, block_size);
	if (rc) {
		kfree(lnode);
		return rc;
	}

	hl_ctx_get(ctx);

	lnode->ctx = ctx;
	lnode->vaddr = vma->vm_start;
	lnode->block_size = block_size;
	lnode->mapped_size = lnode->block_size;
	lnode->id = block_id;

	vma->vm_private_data = lnode;
	vma->vm_ops = &hw_block_vm_ops;

	mutex_lock(&ctx->hw_block_list_lock);
	list_add_tail(&lnode->node, &ctx->hw_block_mem_list);
	mutex_unlock(&ctx->hw_block_list_lock);

	vma->vm_pgoff = block_id;

	return 0;
}

static int set_dma_sg(struct scatterlist *sg, u64 bar_address, u64 chunk_size,
			struct device *dev, enum dma_data_direction dir)
{
	dma_addr_t addr;
	int rc;

	addr = dma_map_resource(dev, bar_address, chunk_size, dir,
				DMA_ATTR_SKIP_CPU_SYNC);
	rc = dma_mapping_error(dev, addr);
	if (rc)
		return rc;

	sg_set_page(sg, NULL, chunk_size, 0);
	sg_dma_address(sg) = addr;
	sg_dma_len(sg) = chunk_size;

	return 0;
}

static struct sg_table *alloc_sgt_from_device_pages(struct hl_device *hdev, u64 *pages, u64 npages,
						u64 page_size, struct device *dev,
						enum dma_data_direction dir)
{
	u64 chunk_size, bar_address, dma_max_seg_size;
	struct asic_fixed_properties *prop;
	int rc, i, j, nents, cur_page;
	struct scatterlist *sg;
	struct sg_table *sgt;

	prop = &hdev->asic_prop;

	dma_max_seg_size = dma_get_max_seg_size(dev);

	/* We would like to align the max segment size to PAGE_SIZE, so the
	 * SGL will contain aligned addresses that can be easily mapped to
	 * an MMU
	 */
	dma_max_seg_size = ALIGN_DOWN(dma_max_seg_size, PAGE_SIZE);
	if (dma_max_seg_size < PAGE_SIZE) {
		dev_err_ratelimited(hdev->dev,
				"dma_max_seg_size %llu can't be smaller than PAGE_SIZE\n",
				dma_max_seg_size);
		return ERR_PTR(-EINVAL);
	}

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

	/* If the size of each page is larger than the dma max segment size,
	 * then we can't combine pages and the number of entries in the SGL
	 * will just be the
	 * <number of pages> * <chunks of max segment size in each page>
	 */
	if (page_size > dma_max_seg_size)
		nents = npages * DIV_ROUND_UP_ULL(page_size, dma_max_seg_size);
	else
		/* Get number of non-contiguous chunks */
		for (i = 1, nents = 1, chunk_size = page_size ; i < npages ; i++) {
			if (pages[i - 1] + page_size != pages[i] ||
					chunk_size + page_size > dma_max_seg_size) {
				nents++;
				chunk_size = page_size;
				continue;
			}

			chunk_size += page_size;
		}

	rc = sg_alloc_table(sgt, nents, GFP_KERNEL | __GFP_ZERO);
	if (rc)
		goto error_free;

	cur_page = 0;

	if (page_size > dma_max_seg_size) {
		u64 size_left, cur_device_address = 0;

		size_left = page_size;

		/* Need to split each page into the number of chunks of
		 * dma_max_seg_size
		 */
		for_each_sgtable_dma_sg(sgt, sg, i) {
			if (size_left == page_size)
				cur_device_address =
					pages[cur_page] - prop->dram_base_address;
			else
				cur_device_address += dma_max_seg_size;

			chunk_size = min(size_left, dma_max_seg_size);

			bar_address = hdev->dram_pci_bar_start + cur_device_address;

			rc = set_dma_sg(sg, bar_address, chunk_size, dev, dir);
			if (rc)
				goto error_unmap;

			if (size_left > dma_max_seg_size) {
				size_left -= dma_max_seg_size;
			} else {
				cur_page++;
				size_left = page_size;
			}
		}
	} else {
		/* Merge pages and put them into the scatterlist */
		for_each_sgtable_dma_sg(sgt, sg, i) {
			chunk_size = page_size;
			for (j = cur_page + 1 ; j < npages ; j++) {
				if (pages[j - 1] + page_size != pages[j] ||
						chunk_size + page_size > dma_max_seg_size)
					break;

				chunk_size += page_size;
			}

			bar_address = hdev->dram_pci_bar_start +
					(pages[cur_page] - prop->dram_base_address);

			rc = set_dma_sg(sg, bar_address, chunk_size, dev, dir);
			if (rc)
				goto error_unmap;

			cur_page = j;
		}
	}

	/* Because we are not going to include a CPU list we want to have some
	 * chance that other users will detect this by setting the orig_nents
	 * to 0 and using only nents (length of DMA list) when going over the
	 * sgl
	 */
	sgt->orig_nents = 0;

	return sgt;

error_unmap:
	for_each_sgtable_dma_sg(sgt, sg, i) {
		if (!sg_dma_len(sg))
			continue;

		dma_unmap_resource(dev, sg_dma_address(sg),
					sg_dma_len(sg), dir,
					DMA_ATTR_SKIP_CPU_SYNC);
	}

	sg_free_table(sgt);

error_free:
	kfree(sgt);
	return ERR_PTR(rc);
}

static int hl_dmabuf_attach(struct dma_buf *dmabuf,
				struct dma_buf_attachment *attachment)
{
	struct hl_dmabuf_priv *hl_dmabuf;
	struct hl_device *hdev;
	int rc;

	hl_dmabuf = dmabuf->priv;
	hdev = hl_dmabuf->ctx->hdev;

	rc = pci_p2pdma_distance_many(hdev->pdev, &attachment->dev, 1, true);

	if (rc < 0)
		attachment->peer2peer = false;
	return 0;
}

static struct sg_table *hl_map_dmabuf(struct dma_buf_attachment *attachment,
					enum dma_data_direction dir)
{
	struct dma_buf *dma_buf = attachment->dmabuf;
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	struct hl_dmabuf_priv *hl_dmabuf;
	struct hl_device *hdev;
	struct sg_table *sgt;

	hl_dmabuf = dma_buf->priv;
	hdev = hl_dmabuf->ctx->hdev;
	phys_pg_pack = hl_dmabuf->phys_pg_pack;

	if (!attachment->peer2peer) {
		dev_dbg(hdev->dev, "Failed to map dmabuf because p2p is disabled\n");
		return ERR_PTR(-EPERM);
	}

	if (phys_pg_pack)
		sgt = alloc_sgt_from_device_pages(hdev,
						phys_pg_pack->pages,
						phys_pg_pack->npages,
						phys_pg_pack->page_size,
						attachment->dev,
						dir);
	else
		sgt = alloc_sgt_from_device_pages(hdev,
						&hl_dmabuf->device_address,
						1,
						hl_dmabuf->dmabuf->size,
						attachment->dev,
						dir);

	if (IS_ERR(sgt))
		dev_err(hdev->dev, "failed (%ld) to initialize sgt for dmabuf\n", PTR_ERR(sgt));

	return sgt;
}

static void hl_unmap_dmabuf(struct dma_buf_attachment *attachment,
				  struct sg_table *sgt,
				  enum dma_data_direction dir)
{
	struct scatterlist *sg;
	int i;

	/* The memory behind the dma-buf has *always* resided on the device itself, i.e. it lives
	 * only in the 'device' domain (after all, it maps a PCI bar address which points to the
	 * device memory).
	 *
	 * Therefore, it was never in the 'CPU' domain and hence, there is no need to perform
	 * a sync of the memory to the CPU's cache, as it never resided inside that cache.
	 */
	for_each_sgtable_dma_sg(sgt, sg, i)
		dma_unmap_resource(attachment->dev, sg_dma_address(sg),
					sg_dma_len(sg), dir,
					DMA_ATTR_SKIP_CPU_SYNC);

	/* Need to restore orig_nents because sg_free_table use that field */
	sgt->orig_nents = sgt->nents;
	sg_free_table(sgt);
	kfree(sgt);
}

static void hl_release_dmabuf(struct dma_buf *dmabuf)
{
	struct hl_dmabuf_priv *hl_dmabuf = dmabuf->priv;
	struct hl_ctx *ctx = hl_dmabuf->ctx;
	struct hl_device *hdev = ctx->hdev;
	struct hl_vm *vm = &hdev->vm;

	if (hl_dmabuf->phys_pg_pack) {
		spin_lock(&vm->idr_lock);
		hl_dmabuf->phys_pg_pack->exporting_cnt--;
		spin_unlock(&vm->idr_lock);
	}

	hl_ctx_put(hl_dmabuf->ctx);

	kfree(hl_dmabuf);
}

static const struct dma_buf_ops habanalabs_dmabuf_ops = {
	.attach = hl_dmabuf_attach,
	.map_dma_buf = hl_map_dmabuf,
	.unmap_dma_buf = hl_unmap_dmabuf,
	.release = hl_release_dmabuf,
};

static int export_dmabuf_common(struct hl_ctx *ctx,
				struct hl_dmabuf_priv *hl_dmabuf,
				u64 total_size, int flags, int *dmabuf_fd)
{
	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
	struct hl_device *hdev = ctx->hdev;
	int rc, fd;

	exp_info.ops = &habanalabs_dmabuf_ops;
	exp_info.size = total_size;
	exp_info.flags = flags;
	exp_info.priv = hl_dmabuf;

	hl_dmabuf->dmabuf = dma_buf_export(&exp_info);
	if (IS_ERR(hl_dmabuf->dmabuf)) {
		dev_err(hdev->dev, "failed to export dma-buf\n");
		return PTR_ERR(hl_dmabuf->dmabuf);
	}

	fd = dma_buf_fd(hl_dmabuf->dmabuf, flags);
	if (fd < 0) {
		dev_err(hdev->dev, "failed to get a file descriptor for a dma-buf\n");
		rc = fd;
		goto err_dma_buf_put;
	}

	hl_dmabuf->ctx = ctx;
	hl_ctx_get(hl_dmabuf->ctx);

	*dmabuf_fd = fd;

	return 0;

err_dma_buf_put:
	dma_buf_put(hl_dmabuf->dmabuf);
	return rc;
}

/**
 * export_dmabuf_from_addr() - export a dma-buf object for the given memory
 *                             address and size.
 * @ctx: pointer to the context structure.
 * @device_addr:  device memory physical address.
 * @size: size of device memory.
 * @flags: DMA-BUF file/FD flags.
 * @dmabuf_fd: pointer to result FD that represents the dma-buf object.
 *
 * Create and export a dma-buf object for an existing memory allocation inside
 * the device memory, and return a FD which is associated with the dma-buf
 * object.
 *
 * Return: 0 on success, non-zero for failure.
 */
static int export_dmabuf_from_addr(struct hl_ctx *ctx, u64 device_addr,
					u64 size, int flags, int *dmabuf_fd)
{
	struct hl_dmabuf_priv *hl_dmabuf;
	struct hl_device *hdev = ctx->hdev;
	struct asic_fixed_properties *prop;
	u64 bar_address;
	int rc;

	prop = &hdev->asic_prop;

	if (!IS_ALIGNED(device_addr, PAGE_SIZE)) {
		dev_dbg(hdev->dev,
			"exported device memory address 0x%llx should be aligned to 0x%lx\n",
			device_addr, PAGE_SIZE);
		return -EINVAL;
	}

	if (size < PAGE_SIZE) {
		dev_dbg(hdev->dev,
			"exported device memory size %llu should be equal to or greater than %lu\n",
			size, PAGE_SIZE);
		return -EINVAL;
	}

	if (device_addr < prop->dram_user_base_address ||
				device_addr + size > prop->dram_end_address ||
				device_addr + size < device_addr) {
		dev_dbg(hdev->dev,
			"DRAM memory range 0x%llx (+0x%llx) is outside of DRAM boundaries\n",
			device_addr, size);
		return -EINVAL;
	}

	bar_address = hdev->dram_pci_bar_start +
			(device_addr - prop->dram_base_address);

	if (bar_address + size >
			hdev->dram_pci_bar_start + prop->dram_pci_bar_size ||
			bar_address + size < bar_address) {
		dev_dbg(hdev->dev,
			"DRAM memory range 0x%llx (+0x%llx) is outside of PCI BAR boundaries\n",
			device_addr, size);
		return -EINVAL;
	}

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

	hl_dmabuf->device_address = device_addr;

	rc = export_dmabuf_common(ctx, hl_dmabuf, size, flags, dmabuf_fd);
	if (rc)
		goto err_free_dmabuf_wrapper;

	return 0;

err_free_dmabuf_wrapper:
	kfree(hl_dmabuf);
	return rc;
}

/**
 * export_dmabuf_from_handle() - export a dma-buf object for the given memory
 *                               handle.
 * @ctx: pointer to the context structure.
 * @handle: device memory allocation handle.
 * @flags: DMA-BUF file/FD flags.
 * @dmabuf_fd: pointer to result FD that represents the dma-buf object.
 *
 * Create and export a dma-buf object for an existing memory allocation inside
 * the device memory, and return a FD which is associated with the dma-buf
 * object.
 *
 * Return: 0 on success, non-zero for failure.
 */
static int export_dmabuf_from_handle(struct hl_ctx *ctx, u64 handle, int flags,
					int *dmabuf_fd)
{
	struct hl_vm_phys_pg_pack *phys_pg_pack;
	struct hl_dmabuf_priv *hl_dmabuf;
	struct hl_device *hdev = ctx->hdev;
	struct asic_fixed_properties *prop;
	struct hl_vm *vm = &hdev->vm;
	u64 bar_address;
	int rc, i;

	prop = &hdev->asic_prop;

	if (upper_32_bits(handle)) {
		dev_dbg(hdev->dev, "no match for handle 0x%llx\n", handle);
		return -EINVAL;
	}

	spin_lock(&vm->idr_lock);

	phys_pg_pack = idr_find(&vm->phys_pg_pack_handles, (u32) handle);
	if (!phys_pg_pack) {
		spin_unlock(&vm->idr_lock);
		dev_dbg(hdev->dev, "no match for handle 0x%x\n", (u32) handle);
		return -EINVAL;
	}

	/* increment now to avoid freeing device memory while exporting */
	phys_pg_pack->exporting_cnt++;

	spin_unlock(&vm->idr_lock);

	if (phys_pg_pack->vm_type != VM_TYPE_PHYS_PACK) {
		dev_dbg(hdev->dev, "handle 0x%llx does not represent DRAM memory\n", handle);
		rc = -EINVAL;
		goto err_dec_exporting_cnt;
	}

	for (i = 0 ; i < phys_pg_pack->npages ; i++) {

		bar_address = hdev->dram_pci_bar_start +
						(phys_pg_pack->pages[i] -
						prop->dram_base_address);

		if (bar_address + phys_pg_pack->page_size >
			hdev->dram_pci_bar_start + prop->dram_pci_bar_size ||
			bar_address + phys_pg_pack->page_size < bar_address) {

			dev_dbg(hdev->dev,
				"DRAM memory range 0x%llx (+0x%x) is outside of PCI BAR boundaries\n",
				phys_pg_pack->pages[i],
				phys_pg_pack->page_size);

			rc = -EINVAL;
			goto err_dec_exporting_cnt;
		}
	}

	hl_dmabuf = kzalloc(sizeof(*hl_dmabuf), GFP_KERNEL);
	if (!hl_dmabuf) {
		rc = -ENOMEM;
		goto err_dec_exporting_cnt;
	}

	hl_dmabuf->phys_pg_pack = phys_pg_pack;

	rc = export_dmabuf_common(ctx, hl_dmabuf, phys_pg_pack->total_size,
				flags, dmabuf_fd);
	if (rc)
		goto err_free_dmabuf_wrapper;

	return 0;

err_free_dmabuf_wrapper:
	kfree(hl_dmabuf);

err_dec_exporting_cnt:
	spin_lock(&vm->idr_lock);
	phys_pg_pack->exporting_cnt--;
	spin_unlock(&vm->idr_lock);

	return rc;
}

static int mem_ioctl_no_mmu(struct hl_fpriv *hpriv, union hl_mem_args *args)
{
	struct hl_device *hdev = hpriv->hdev;
	u64 block_handle, device_addr = 0;
	struct hl_ctx *ctx = hpriv->ctx;
	u32 handle = 0, block_size;
	int rc;

	switch (args->in.op) {
	case HL_MEM_OP_ALLOC:
		if (args->in.alloc.mem_size == 0) {
			dev_err(hdev->dev, "alloc size must be larger than 0\n");
			rc = -EINVAL;
			goto out;
		}

		/* Force contiguous as there are no real MMU
		 * translations to overcome physical memory gaps
		 */
		args->in.flags |= HL_MEM_CONTIGUOUS;
		rc = alloc_device_memory(ctx, &args->in, &handle);

		memset(args, 0, sizeof(*args));
		args->out.handle = (__u64) handle;
		break;

	case HL_MEM_OP_FREE:
		rc = free_device_memory(ctx, &args->in);
		break;

	case HL_MEM_OP_MAP:
		if (args->in.flags & HL_MEM_USERPTR) {
			dev_err(hdev->dev, "Failed to map host memory when MMU is disabled\n");
			rc = -EPERM;
		} else {
			rc = get_paddr_from_handle(ctx, &args->in, &device_addr);
			memset(args, 0, sizeof(*args));
			args->out.device_virt_addr = device_addr;
		}

		break;

	case HL_MEM_OP_UNMAP:
		rc = 0;
		break;

	case HL_MEM_OP_MAP_BLOCK:
		rc = map_block(hdev, args->in.map_block.block_addr, &block_handle, &block_size);
		args->out.block_handle = block_handle;
		args->out.block_size = block_size;
		break;

	case HL_MEM_OP_EXPORT_DMABUF_FD:
		dev_err(hdev->dev, "Failed to export dma-buf object when MMU is disabled\n");
		rc = -EPERM;
		break;

	case HL_MEM_OP_TS_ALLOC:
		rc = allocate_timestamps_buffers(hpriv, &args->in, &args->out.handle);
		break;
	default:
		dev_err(hdev->dev, "Unknown opcode for memory IOCTL\n");
		rc = -EINVAL;
		break;
	}

out:
	return rc;
}

static void ts_buff_release(struct hl_mmap_mem_buf *buf)
{
	struct hl_ts_buff *ts_buff = buf->private;

	vfree(ts_buff->kernel_buff_address);
	vfree(ts_buff->user_buff_address);
	kfree(ts_buff);
}

static int hl_ts_mmap(struct hl_mmap_mem_buf *buf, struct vm_area_struct *vma, void *args)
{
	struct hl_ts_buff *ts_buff = buf->private;

	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_DONTCOPY | VM_NORESERVE;
	return remap_vmalloc_range(vma, ts_buff->user_buff_address, 0);
}

static int hl_ts_alloc_buf(struct hl_mmap_mem_buf *buf, gfp_t gfp, void *args)
{
	struct hl_ts_buff *ts_buff = NULL;
	u32 size, num_elements;
	void *p;

	num_elements = *(u32 *)args;

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

	/* Allocate the user buffer */
	size = num_elements * sizeof(u64);
	p = vmalloc_user(size);
	if (!p)
		goto free_mem;

	ts_buff->user_buff_address = p;
	buf->mappable_size = size;

	/* Allocate the internal kernel buffer */
	size = num_elements * sizeof(struct hl_user_pending_interrupt);
	p = vmalloc(size);
	if (!p)
		goto free_user_buff;

	ts_buff->kernel_buff_address = p;
	ts_buff->kernel_buff_size = size;

	buf->private = ts_buff;

	return 0;

free_user_buff:
	vfree(ts_buff->user_buff_address);
free_mem:
	kfree(ts_buff);
	return -ENOMEM;
}

static struct hl_mmap_mem_buf_behavior hl_ts_behavior = {
	.topic = "TS",
	.mem_id = HL_MMAP_TYPE_TS_BUFF,
	.mmap = hl_ts_mmap,
	.alloc = hl_ts_alloc_buf,
	.release = ts_buff_release,
};

/**
 * allocate_timestamps_buffers() - allocate timestamps buffers
 * This function will allocate ts buffer that will later on be mapped to the user
 * in order to be able to read the timestamp.
 * in additon it'll allocate an extra buffer for registration management.
 * since we cannot fail during registration for out-of-memory situation, so
 * we'll prepare a pool which will be used as user interrupt nodes and instead
 * of dynamically allocating nodes while registration we'll pick the node from
 * this pool. in addtion it'll add node to the mapping hash which will be used
 * to map user ts buffer to the internal kernel ts buffer.
 * @hpriv: pointer to the private data of the fd
 * @args: ioctl input
 * @handle: user timestamp buffer handle as an output
 */
static int allocate_timestamps_buffers(struct hl_fpriv *hpriv, struct hl_mem_in *args, u64 *handle)
{
	struct hl_mem_mgr *mmg = &hpriv->mem_mgr;
	struct hl_mmap_mem_buf *buf;

	if (args->num_of_elements > TS_MAX_ELEMENTS_NUM) {
		dev_err(mmg->dev, "Num of elements exceeds Max allowed number (0x%x > 0x%x)\n",
				args->num_of_elements, TS_MAX_ELEMENTS_NUM);
		return -EINVAL;
	}

	buf = hl_mmap_mem_buf_alloc(mmg, &hl_ts_behavior, GFP_KERNEL, &args->num_of_elements);
	if (!buf)
		return -ENOMEM;

	*handle = buf->handle;

	return 0;
}

int hl_mem_ioctl(struct hl_fpriv *hpriv, void *data)
{
	enum hl_device_status status;
	union hl_mem_args *args = data;
	struct hl_device *hdev = hpriv->hdev;
	struct hl_ctx *ctx = hpriv->ctx;
	u64 block_handle, device_addr = 0;
	u32 handle = 0, block_size;
	int rc, dmabuf_fd = -EBADF;

	if (!hl_device_operational(hdev, &status)) {
		dev_warn_ratelimited(hdev->dev,
			"Device is %s. Can't execute MEMORY IOCTL\n",
			hdev->status[status]);
		return -EBUSY;
	}

	if (!hdev->mmu_enable)
		return mem_ioctl_no_mmu(hpriv, args);

	switch (args->in.op) {
	case HL_MEM_OP_ALLOC:
		if (args->in.alloc.mem_size == 0) {
			dev_err(hdev->dev,
				"alloc size must be larger than 0\n");
			rc = -EINVAL;
			goto out;
		}

		/* If DRAM does not support virtual memory the driver won't
		 * handle the allocation/freeing of that memory. However, for
		 * system administration/monitoring purposes, the driver will
		 * keep track of the amount of DRAM memory that is allocated
		 * and freed by the user. Because this code totally relies on
		 * the user's input, the driver can't ensure the validity
		 * of this accounting.
		 */
		if (!hdev->asic_prop.dram_supports_virtual_memory) {
			atomic64_add(args->in.alloc.mem_size,
					&ctx->dram_phys_mem);
			atomic64_add(args->in.alloc.mem_size,
					&hdev->dram_used_mem);

			dev_dbg(hdev->dev, "DRAM alloc is not supported\n");
			rc = 0;

			memset(args, 0, sizeof(*args));
			args->out.handle = 0;
			goto out;
		}

		rc = alloc_device_memory(ctx, &args->in, &handle);

		memset(args, 0, sizeof(*args));
		args->out.handle = (__u64) handle;
		break;

	case HL_MEM_OP_FREE:
		/* If DRAM does not support virtual memory the driver won't
		 * handle the allocation/freeing of that memory. However, for
		 * system administration/monitoring purposes, the driver will
		 * keep track of the amount of DRAM memory that is allocated
		 * and freed by the user. Because this code totally relies on
		 * the user's input, the driver can't ensure the validity
		 * of this accounting.
		 */
		if (!hdev->asic_prop.dram_supports_virtual_memory) {
			atomic64_sub(args->in.alloc.mem_size,
					&ctx->dram_phys_mem);
			atomic64_sub(args->in.alloc.mem_size,
					&hdev->dram_used_mem);

			dev_dbg(hdev->dev, "DRAM alloc is not supported\n");
			rc = 0;

			goto out;
		}

		rc = free_device_memory(ctx, &args->in);
		break;

	case HL_MEM_OP_MAP:
		rc = map_device_va(ctx, &args->in, &device_addr);

		memset(args, 0, sizeof(*args));
		args->out.device_virt_addr = device_addr;
		break;

	case HL_MEM_OP_UNMAP:
		rc = unmap_device_va(ctx, &args->in, false);
		break;

	case HL_MEM_OP_MAP_BLOCK:
		rc = map_block(hdev, args->in.map_block.block_addr,
				&block_handle, &block_size);
		args->out.block_handle = block_handle;
		args->out.block_size = block_size;
		break;

	case HL_MEM_OP_EXPORT_DMABUF_FD:
		if (hdev->asic_prop.dram_supports_virtual_memory)
			rc = export_dmabuf_from_handle(ctx,
					args->in.export_dmabuf_fd.handle,
					args->in.flags,
					&dmabuf_fd);
		else
			rc = export_dmabuf_from_addr(ctx,
					args->in.export_dmabuf_fd.handle,
					args->in.export_dmabuf_fd.mem_size,
					args->in.flags,
					&dmabuf_fd);
		memset(args, 0, sizeof(*args));
		args->out.fd = dmabuf_fd;
		break;

	case HL_MEM_OP_TS_ALLOC:
		rc = allocate_timestamps_buffers(hpriv, &args->in, &args->out.handle);
		break;
	default:
		dev_err(hdev->dev, "Unknown opcode for memory IOCTL\n");
		rc = -EINVAL;
		break;
	}

out:
	return rc;
}

static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,
				u32 npages, u64 start, u32 offset,
				struct hl_userptr *userptr)
{
	int rc;

	if (!access_ok((void __user *) (uintptr_t) addr, size)) {
		dev_err(hdev->dev, "user pointer is invalid - 0x%llx\n", addr);
		return -EFAULT;
	}

	userptr->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
	if (!userptr->pages)
		return -ENOMEM;

	rc = pin_user_pages_fast(start, npages,
				 FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM,
				 userptr->pages);

	if (rc != npages) {
		dev_err(hdev->dev,
			"Failed (%d) to pin host memory with user ptr 0x%llx, size 0x%llx, npages %d\n",
			rc, addr, size, npages);
		if (rc < 0)
			goto destroy_pages;
		npages = rc;
		rc = -EFAULT;
		goto put_pages;
	}
	userptr->npages = npages;

	rc = sg_alloc_table_from_pages(userptr->sgt,
				       userptr->pages,
				       npages, offset, size, GFP_KERNEL);
	if (rc < 0) {
		dev_err(hdev->dev, "failed to create SG table from pages\n");
		goto put_pages;
	}

	return 0;

put_pages:
	unpin_user_pages(userptr->pages, npages);
destroy_pages:
	kvfree(userptr->pages);
	return rc;
}

/**
 * hl_pin_host_memory() - pins a chunk of host memory.
 * @hdev: pointer to the habanalabs device structure.
 * @addr: the host virtual address of the memory area.
 * @size: the size of the memory area.
 * @userptr: pointer to hl_userptr structure.
 *
 * This function does the following:
 * - Pins the physical pages.
 * - Create an SG list from those pages.
 */
int hl_pin_host_memory(struct hl_device *hdev, u64 addr, u64 size,
					struct hl_userptr *userptr)
{
	u64 start, end;
	u32 npages, offset;
	int rc;

	if (!size) {
		dev_err(hdev->dev, "size to pin is invalid - %llu\n", size);
		return -EINVAL;
	}

	/*
	 * If the combination of the address and size requested for this memory
	 * region causes an integer overflow, return error.
	 */
	if (((addr + size) < addr) ||
			PAGE_ALIGN(addr + size) < (addr + size)) {
		dev_err(hdev->dev,
			"user pointer 0x%llx + %llu causes integer overflow\n",
			addr, size);
		return -EINVAL;
	}

	userptr->pid = current->pid;
	userptr->sgt = kzalloc(sizeof(*userptr->sgt), GFP_KERNEL);
	if (!userptr->sgt)
		return -ENOMEM;

	start = addr & PAGE_MASK;
	offset = addr & ~PAGE_MASK;
	end = PAGE_ALIGN(addr + size);
	npages = (end - start) >> PAGE_SHIFT;

	userptr->size = size;
	userptr->addr = addr;
	userptr->dma_mapped = false;
	INIT_LIST_HEAD(&userptr->job_node);

	rc = get_user_memory(hdev, addr, size, npages, start, offset,
				userptr);
	if (rc) {
		dev_err(hdev->dev,
			"failed to get user memory for address 0x%llx\n",
			addr);
		goto free_sgt;
	}

	hl_debugfs_add_userptr(hdev, userptr);

	return 0;

free_sgt:
	kfree(userptr->sgt);
	return rc;
}

/*
 * hl_unpin_host_memory - unpins a chunk of host memory.
 * @hdev: pointer to the habanalabs device structure
 * @userptr: pointer to hl_userptr structure
 *
 * This function does the following:
 * - Unpins the physical pages related to the host memory
 * - Free the SG list
 */
void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr)
{
	hl_debugfs_remove_userptr(hdev, userptr);

	if (userptr->dma_mapped)
		hdev->asic_funcs->hl_dma_unmap_sgtable(hdev, userptr->sgt, userptr->dir);

	unpin_user_pages_dirty_lock(userptr->pages, userptr->npages, true);
	kvfree(userptr->pages);

	list_del(&userptr->job_node);

	sg_free_table(userptr->sgt);
	kfree(userptr->sgt);
}

/**
 * hl_userptr_delete_list() - clear userptr list.
 * @hdev: pointer to the habanalabs device structure.
 * @userptr_list: pointer to the list to clear.
 *
 * This function does the following:
 * - Iterates over the list and unpins the host memory and frees the userptr
 *   structure.
 */
void hl_userptr_delete_list(struct hl_device *hdev,
				struct list_head *userptr_list)
{
	struct hl_userptr *userptr, *tmp;

	list_for_each_entry_safe(userptr, tmp, userptr_list, job_node) {
		hl_unpin_host_memory(hdev, userptr);
		kfree(userptr);
	}

	INIT_LIST_HEAD(userptr_list);
}

/**
 * hl_userptr_is_pinned() - returns whether the given userptr is pinned.
 * @hdev: pointer to the habanalabs device structure.
 * @addr: user address to check.
 * @size: user block size to check.
 * @userptr_list: pointer to the list to clear.
 * @userptr: pointer to userptr to check.
 *
 * This function does the following:
 * - Iterates over the list and checks if the given userptr is in it, means is
 *   pinned. If so, returns true, otherwise returns false.
 */
bool hl_userptr_is_pinned(struct hl_device *hdev, u64 addr,
				u32 size, struct list_head *userptr_list,
				struct hl_userptr **userptr)
{
	list_for_each_entry((*userptr), userptr_list, job_node) {
		if ((addr == (*userptr)->addr) && (size == (*userptr)->size))
			return true;
	}

	return false;
}

/**
 * va_range_init() - initialize virtual addresses range.
 * @hdev: pointer to the habanalabs device structure.
 * @va_ranges: pointer to va_ranges array.
 * @range_type: virtual address range type.
 * @start: range start address, inclusive.
 * @end: range end address, inclusive.
 * @page_size: page size for this va_range.
 *
 * This function does the following:
 * - Initializes the virtual addresses list of the given range with the given
 *   addresses.
 */
static int va_range_init(struct hl_device *hdev, struct hl_va_range **va_ranges,
				enum hl_va_range_type range_type, u64 start,
				u64 end, u32 page_size)
{
	struct hl_va_range *va_range = va_ranges[range_type];
	int rc;

	INIT_LIST_HEAD(&va_range->list);

	/*
	 * PAGE_SIZE alignment
	 * it is the callers responsibility to align the addresses if the
	 * page size is not a power of 2
	 */

	if (is_power_of_2(page_size)) {
		if (start & (PAGE_SIZE - 1)) {
			start &= PAGE_MASK;
			start += PAGE_SIZE;
		}

		/*
		 * The end of the range is inclusive, hence we need to align it
		 * to the end of the last full page in the range. For example if
		 * end = 0x3ff5 with page size 0x1000, we need to align it to
		 * 0x2fff. The remainig 0xff5 bytes do not form a full page.
		 */
		if ((end + 1) & (PAGE_SIZE - 1))
			end = ((end + 1) & PAGE_MASK) - 1;
	}

	if (start >= end) {
		dev_err(hdev->dev, "too small vm range for va list\n");
		return -EFAULT;
	}

	rc = add_va_block(hdev, va_range, start, end);

	if (rc) {
		dev_err(hdev->dev, "Failed to init host va list\n");
		return rc;
	}

	va_range->start_addr = start;
	va_range->end_addr = end;
	va_range->page_size = page_size;

	return 0;
}

/**
 * va_range_fini() - clear a virtual addresses range.
 * @hdev: pointer to the habanalabs structure.
 * @va_range: pointer to virtual addresses range.
 *
 * This function does the following:
 * - Frees the virtual addresses block list and its lock.
 */
static void va_range_fini(struct hl_device *hdev, struct hl_va_range *va_range)
{
	mutex_lock(&va_range->lock);
	clear_va_list_locked(hdev, &va_range->list);
	mutex_unlock(&va_range->lock);

	mutex_destroy(&va_range->lock);
	kfree(va_range);
}

/**
 * vm_ctx_init_with_ranges() - initialize virtual memory for context.
 * @ctx: pointer to the habanalabs context structure.
 * @host_range_start: host virtual addresses range start.
 * @host_range_end: host virtual addresses range end.
 * @host_page_size: host page size.
 * @host_huge_range_start: host virtual addresses range start for memory
 *                         allocated with huge pages.
 * @host_huge_range_end: host virtual addresses range end for memory allocated
 *                        with huge pages.
 * @host_huge_page_size: host huge page size.
 * @dram_range_start: dram virtual addresses range start.
 * @dram_range_end: dram virtual addresses range end.
 * @dram_page_size: dram page size.
 *
 * This function initializes the following:
 * - MMU for context.
 * - Virtual address to area descriptor hashtable.
 * - Virtual block list of available virtual memory.
 */
static int vm_ctx_init_with_ranges(struct hl_ctx *ctx,
					u64 host_range_start,
					u64 host_range_end,
					u32 host_page_size,
					u64 host_huge_range_start,
					u64 host_huge_range_end,
					u32 host_huge_page_size,
					u64 dram_range_start,
					u64 dram_range_end,
					u32 dram_page_size)
{
	struct hl_device *hdev = ctx->hdev;
	int i, rc;

	for (i = 0 ; i < HL_VA_RANGE_TYPE_MAX ; i++) {
		ctx->va_range[i] =
			kzalloc(sizeof(struct hl_va_range), GFP_KERNEL);
		if (!ctx->va_range[i]) {
			rc = -ENOMEM;
			goto free_va_range;
		}
	}

	rc = hl_mmu_ctx_init(ctx);
	if (rc) {
		dev_err(hdev->dev, "failed to init context %d\n", ctx->asid);
		goto free_va_range;
	}

	mutex_init(&ctx->mem_hash_lock);
	hash_init(ctx->mem_hash);

	mutex_init(&ctx->va_range[HL_VA_RANGE_TYPE_HOST]->lock);

	rc = va_range_init(hdev, ctx->va_range, HL_VA_RANGE_TYPE_HOST,
			host_range_start, host_range_end, host_page_size);
	if (rc) {
		dev_err(hdev->dev, "failed to init host vm range\n");
		goto mmu_ctx_fini;
	}

	if (hdev->pmmu_huge_range) {
		mutex_init(&ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]->lock);

		rc = va_range_init(hdev,
			ctx->va_range, HL_VA_RANGE_TYPE_HOST_HUGE,
			host_huge_range_start, host_huge_range_end,
			host_huge_page_size);
		if (rc) {
			dev_err(hdev->dev,
				"failed to init host huge vm range\n");
			goto clear_host_va_range;
		}
	} else {
		kfree(ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]);
		ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE] =
				ctx->va_range[HL_VA_RANGE_TYPE_HOST];
	}

	mutex_init(&ctx->va_range[HL_VA_RANGE_TYPE_DRAM]->lock);

	rc = va_range_init(hdev, ctx->va_range, HL_VA_RANGE_TYPE_DRAM,
			dram_range_start, dram_range_end, dram_page_size);
	if (rc) {
		dev_err(hdev->dev, "failed to init dram vm range\n");
		goto clear_host_huge_va_range;
	}

	hl_debugfs_add_ctx_mem_hash(hdev, ctx);

	return 0;

clear_host_huge_va_range:
	mutex_destroy(&ctx->va_range[HL_VA_RANGE_TYPE_DRAM]->lock);

	if (hdev->pmmu_huge_range) {
		mutex_lock(&ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]->lock);
		clear_va_list_locked(hdev,
			&ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]->list);
		mutex_unlock(&ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]->lock);
	}
clear_host_va_range:
	if (hdev->pmmu_huge_range)
		mutex_destroy(&ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]->lock);
	mutex_lock(&ctx->va_range[HL_VA_RANGE_TYPE_HOST]->lock);
	clear_va_list_locked(hdev, &ctx->va_range[HL_VA_RANGE_TYPE_HOST]->list);
	mutex_unlock(&ctx->va_range[HL_VA_RANGE_TYPE_HOST]->lock);
mmu_ctx_fini:
	mutex_destroy(&ctx->va_range[HL_VA_RANGE_TYPE_HOST]->lock);
	mutex_destroy(&ctx->mem_hash_lock);
	hl_mmu_ctx_fini(ctx);
free_va_range:
	for (i = 0 ; i < HL_VA_RANGE_TYPE_MAX ; i++)
		kfree(ctx->va_range[i]);

	return rc;
}

int hl_vm_ctx_init(struct hl_ctx *ctx)
{
	struct asic_fixed_properties *prop = &ctx->hdev->asic_prop;
	u64 host_range_start, host_range_end, host_huge_range_start,
		host_huge_range_end, dram_range_start, dram_range_end;
	u32 host_page_size, host_huge_page_size, dram_page_size;

	atomic64_set(&ctx->dram_phys_mem, 0);

	/*
	 * - If MMU is enabled, init the ranges as usual.
	 * - If MMU is disabled, in case of host mapping, the returned address
	 *   is the given one.
	 *   In case of DRAM mapping, the returned address is the physical
	 *   address of the memory related to the given handle.
	 */
	if (!ctx->hdev->mmu_enable)
		return 0;

	dram_range_start = prop->dmmu.start_addr;
	dram_range_end = prop->dmmu.end_addr - 1;
	dram_page_size = prop->dram_page_size ?
				prop->dram_page_size : prop->dmmu.page_size;
	host_range_start = prop->pmmu.start_addr;
	host_range_end = prop->pmmu.end_addr - 1;
	host_page_size = prop->pmmu.page_size;
	host_huge_range_start = prop->pmmu_huge.start_addr;
	host_huge_range_end = prop->pmmu_huge.end_addr - 1;
	host_huge_page_size = prop->pmmu_huge.page_size;

	return vm_ctx_init_with_ranges(ctx, host_range_start, host_range_end,
			host_page_size, host_huge_range_start,
			host_huge_range_end, host_huge_page_size,
			dram_range_start, dram_range_end, dram_page_size);
}

/**
 * hl_vm_ctx_fini() - virtual memory teardown of context.
 * @ctx: pointer to the habanalabs context structure.
 *
 * This function perform teardown the following:
 * - Virtual block list of available virtual memory.
 * - Virtual address to area descriptor hashtable.
 * - MMU for context.
 *
 * In addition this function does the following:
 * - Unmaps the existing hashtable nodes if the hashtable is not empty. The
 *   hashtable should be empty as no valid mappings should exist at this
 *   point.
 * - Frees any existing physical page list from the idr which relates to the
 *   current context asid.
 * - This function checks the virtual block list for correctness. At this point
 *   the list should contain one element which describes the whole virtual
 *   memory range of the context. Otherwise, a warning is printed.
 */
void hl_vm_ctx_fini(struct hl_ctx *ctx)
{
	struct hl_vm_phys_pg_pack *phys_pg_list, *tmp_phys_node;
	struct hl_device *hdev = ctx->hdev;
	struct hl_vm_hash_node *hnode;
	struct hl_vm *vm = &hdev->vm;
	struct hlist_node *tmp_node;
	struct list_head free_list;
	struct hl_mem_in args;
	int i;

	if (!hdev->mmu_enable)
		return;

	hl_debugfs_remove_ctx_mem_hash(hdev, ctx);

	/*
	 * Clearly something went wrong on hard reset so no point in printing
	 * another side effect error
	 */
	if (!hdev->reset_info.hard_reset_pending && !hash_empty(ctx->mem_hash))
		dev_dbg(hdev->dev,
			"user released device without removing its memory mappings\n");

	hash_for_each_safe(ctx->mem_hash, i, tmp_node, hnode, node) {
		dev_dbg(hdev->dev,
			"hl_mem_hash_node of vaddr 0x%llx of asid %d is still alive\n",
			hnode->vaddr, ctx->asid);
		args.unmap.device_virt_addr = hnode->vaddr;
		unmap_device_va(ctx, &args, true);
	}

	mutex_lock(&hdev->mmu_lock);

	/* invalidate the cache once after the unmapping loop */
	hl_mmu_invalidate_cache(hdev, true, MMU_OP_USERPTR);
	hl_mmu_invalidate_cache(hdev, true, MMU_OP_PHYS_PACK);

	mutex_unlock(&hdev->mmu_lock);

	INIT_LIST_HEAD(&free_list);

	spin_lock(&vm->idr_lock);
	idr_for_each_entry(&vm->phys_pg_pack_handles, phys_pg_list, i)
		if (phys_pg_list->asid == ctx->asid) {
			dev_dbg(hdev->dev,
				"page list 0x%px of asid %d is still alive\n",
				phys_pg_list, ctx->asid);

			atomic64_sub(phys_pg_list->total_size, &hdev->dram_used_mem);
			idr_remove(&vm->phys_pg_pack_handles, i);
			list_add(&phys_pg_list->node, &free_list);
		}
	spin_unlock(&vm->idr_lock);

	list_for_each_entry_safe(phys_pg_list, tmp_phys_node, &free_list, node)
		free_phys_pg_pack(hdev, phys_pg_list);

	va_range_fini(hdev, ctx->va_range[HL_VA_RANGE_TYPE_DRAM]);
	va_range_fini(hdev, ctx->va_range[HL_VA_RANGE_TYPE_HOST]);

	if (hdev->pmmu_huge_range)
		va_range_fini(hdev, ctx->va_range[HL_VA_RANGE_TYPE_HOST_HUGE]);

	mutex_destroy(&ctx->mem_hash_lock);
	hl_mmu_ctx_fini(ctx);

	/* In this case we need to clear the global accounting of DRAM usage
	 * because the user notifies us on allocations. If the user is no more,
	 * all DRAM is available
	 */
	if (ctx->asid != HL_KERNEL_ASID_ID &&
			!hdev->asic_prop.dram_supports_virtual_memory)
		atomic64_set(&hdev->dram_used_mem, 0);
}

/**
 * hl_vm_init() - initialize virtual memory module.
 * @hdev: pointer to the habanalabs device structure.
 *
 * This function initializes the following:
 * - MMU module.
 * - DRAM physical pages pool of 2MB.
 * - Idr for device memory allocation handles.
 */
int hl_vm_init(struct hl_device *hdev)
{
	struct asic_fixed_properties *prop = &hdev->asic_prop;
	struct hl_vm *vm = &hdev->vm;
	int rc;

	if (is_power_of_2(prop->dram_page_size))
		vm->dram_pg_pool =
			gen_pool_create(__ffs(prop->dram_page_size), -1);
	else
		vm->dram_pg_pool =
			gen_pool_create(__ffs(DRAM_POOL_PAGE_SIZE), -1);

	if (!vm->dram_pg_pool) {
		dev_err(hdev->dev, "Failed to create dram page pool\n");
		return -ENOMEM;
	}

	kref_init(&vm->dram_pg_pool_refcount);

	rc = gen_pool_add(vm->dram_pg_pool, prop->dram_user_base_address,
			prop->dram_end_address - prop->dram_user_base_address,
			-1);

	if (rc) {
		dev_err(hdev->dev,
			"Failed to add memory to dram page pool %d\n", rc);
		goto pool_add_err;
	}

	spin_lock_init(&vm->idr_lock);
	idr_init(&vm->phys_pg_pack_handles);

	atomic64_set(&hdev->dram_used_mem, 0);

	vm->init_done = true;

	return 0;

pool_add_err:
	gen_pool_destroy(vm->dram_pg_pool);

	return rc;
}

/**
 * hl_vm_fini() - virtual memory module teardown.
 * @hdev: pointer to the habanalabs device structure.
 *
 * This function perform teardown to the following:
 * - Idr for device memory allocation handles.
 * - DRAM physical pages pool of 2MB.
 * - MMU module.
 */
void hl_vm_fini(struct hl_device *hdev)
{
	struct hl_vm *vm = &hdev->vm;

	if (!vm->init_done)
		return;

	/*
	 * At this point all the contexts should be freed and hence no DRAM
	 * memory should be in use. Hence the DRAM pool should be freed here.
	 */
	if (kref_put(&vm->dram_pg_pool_refcount, dram_pg_pool_do_release) != 1)
		dev_warn(hdev->dev, "dram_pg_pool was not destroyed on %s\n",
				__func__);

	vm->init_done = false;
}

/**
 * hl_hw_block_mem_init() - HW block memory initialization.
 * @ctx: pointer to the habanalabs context structure.
 *
 * This function initializes the HW block virtual mapped addresses list and
 * it's lock.
 */
void hl_hw_block_mem_init(struct hl_ctx *ctx)
{
	mutex_init(&ctx->hw_block_list_lock);
	INIT_LIST_HEAD(&ctx->hw_block_mem_list);
}

/**
 * hl_hw_block_mem_fini() - HW block memory teardown.
 * @ctx: pointer to the habanalabs context structure.
 *
 * This function clears the HW block virtual mapped addresses list and destroys
 * it's lock.
 */
void hl_hw_block_mem_fini(struct hl_ctx *ctx)
{
	struct hl_vm_hw_block_list_node *lnode, *tmp;

	if (!list_empty(&ctx->hw_block_mem_list))
		dev_crit(ctx->hdev->dev, "HW block mem list isn't empty\n");

	list_for_each_entry_safe(lnode, tmp, &ctx->hw_block_mem_list, node) {
		list_del(&lnode->node);
		kfree(lnode);
	}

	mutex_destroy(&ctx->hw_block_list_lock);
}