1 | /* $NetBSD: nouveau_core_ramht.c,v 1.1.1.1 2014/08/06 12:36:24 riastradh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright 2012 Red Hat Inc. |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a |
7 | * copy of this software and associated documentation files (the "Software"), |
8 | * to deal in the Software without restriction, including without limitation |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
10 | * and/or sell copies of the Software, and to permit persons to whom the |
11 | * Software is furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
22 | * OTHER DEALINGS IN THE SOFTWARE. |
23 | */ |
24 | |
25 | #include <sys/cdefs.h> |
26 | __KERNEL_RCSID(0, "$NetBSD: nouveau_core_ramht.c,v 1.1.1.1 2014/08/06 12:36:24 riastradh Exp $" ); |
27 | |
28 | #include <core/object.h> |
29 | #include <core/ramht.h> |
30 | |
31 | #include <subdev/bar.h> |
32 | |
33 | static u32 |
34 | nouveau_ramht_hash(struct nouveau_ramht *ramht, int chid, u32 handle) |
35 | { |
36 | u32 hash = 0; |
37 | |
38 | while (handle) { |
39 | hash ^= (handle & ((1 << ramht->bits) - 1)); |
40 | handle >>= ramht->bits; |
41 | } |
42 | |
43 | hash ^= chid << (ramht->bits - 4); |
44 | hash = hash << 3; |
45 | return hash; |
46 | } |
47 | |
48 | int |
49 | nouveau_ramht_insert(struct nouveau_ramht *ramht, int chid, |
50 | u32 handle, u32 context) |
51 | { |
52 | struct nouveau_bar *bar = nouveau_bar(ramht); |
53 | u32 co, ho; |
54 | |
55 | co = ho = nouveau_ramht_hash(ramht, chid, handle); |
56 | do { |
57 | if (!nv_ro32(ramht, co + 4)) { |
58 | nv_wo32(ramht, co + 0, handle); |
59 | nv_wo32(ramht, co + 4, context); |
60 | if (bar) |
61 | bar->flush(bar); |
62 | return co; |
63 | } |
64 | |
65 | co += 8; |
66 | if (co >= nv_gpuobj(ramht)->size) |
67 | co = 0; |
68 | } while (co != ho); |
69 | |
70 | return -ENOMEM; |
71 | } |
72 | |
73 | void |
74 | nouveau_ramht_remove(struct nouveau_ramht *ramht, int cookie) |
75 | { |
76 | struct nouveau_bar *bar = nouveau_bar(ramht); |
77 | nv_wo32(ramht, cookie + 0, 0x00000000); |
78 | nv_wo32(ramht, cookie + 4, 0x00000000); |
79 | if (bar) |
80 | bar->flush(bar); |
81 | } |
82 | |
83 | static struct nouveau_oclass |
84 | nouveau_ramht_oclass = { |
85 | .handle = 0x0000abcd, |
86 | .ofuncs = &(struct nouveau_ofuncs) { |
87 | .ctor = NULL, |
88 | .dtor = _nouveau_gpuobj_dtor, |
89 | .init = _nouveau_gpuobj_init, |
90 | .fini = _nouveau_gpuobj_fini, |
91 | .rd32 = _nouveau_gpuobj_rd32, |
92 | .wr32 = _nouveau_gpuobj_wr32, |
93 | }, |
94 | }; |
95 | |
96 | int |
97 | nouveau_ramht_new(struct nouveau_object *parent, struct nouveau_object *pargpu, |
98 | u32 size, u32 align, struct nouveau_ramht **pramht) |
99 | { |
100 | struct nouveau_ramht *ramht; |
101 | int ret; |
102 | |
103 | ret = nouveau_gpuobj_create(parent, parent->engine ? |
104 | parent->engine : parent, /* <nv50 ramht */ |
105 | &nouveau_ramht_oclass, 0, pargpu, size, |
106 | align, NVOBJ_FLAG_ZERO_ALLOC, &ramht); |
107 | *pramht = ramht; |
108 | if (ret) |
109 | return ret; |
110 | |
111 | ramht->bits = order_base_2(nv_gpuobj(ramht)->size >> 3); |
112 | return 0; |
113 | } |
114 | |