1 /*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22 #include <core/ramht.h>
23 #include <core/engine.h>
24
25 #include <subdev/bar.h>
26
27 static u32
nvkm_ramht_hash(struct nvkm_ramht * ramht,int chid,u32 handle)28 nvkm_ramht_hash(struct nvkm_ramht *ramht, int chid, u32 handle)
29 {
30 u32 hash = 0;
31
32 while (handle) {
33 hash ^= (handle & ((1 << ramht->bits) - 1));
34 handle >>= ramht->bits;
35 }
36
37 hash ^= chid << (ramht->bits - 4);
38 hash = hash << 3;
39 return hash;
40 }
41
42 int
nvkm_ramht_insert(struct nvkm_ramht * ramht,int chid,u32 handle,u32 context)43 nvkm_ramht_insert(struct nvkm_ramht *ramht, int chid, u32 handle, u32 context)
44 {
45 struct nvkm_bar *bar = nvkm_bar(ramht);
46 u32 co, ho;
47
48 co = ho = nvkm_ramht_hash(ramht, chid, handle);
49 do {
50 if (!nv_ro32(ramht, co + 4)) {
51 nv_wo32(ramht, co + 0, handle);
52 nv_wo32(ramht, co + 4, context);
53 if (bar)
54 bar->flush(bar);
55 return co;
56 }
57
58 co += 8;
59 if (co >= nv_gpuobj(ramht)->size)
60 co = 0;
61 } while (co != ho);
62
63 return -ENOMEM;
64 }
65
66 void
nvkm_ramht_remove(struct nvkm_ramht * ramht,int cookie)67 nvkm_ramht_remove(struct nvkm_ramht *ramht, int cookie)
68 {
69 struct nvkm_bar *bar = nvkm_bar(ramht);
70 nv_wo32(ramht, cookie + 0, 0x00000000);
71 nv_wo32(ramht, cookie + 4, 0x00000000);
72 if (bar)
73 bar->flush(bar);
74 }
75
76 static struct nvkm_oclass
77 nvkm_ramht_oclass = {
78 .handle = 0x0000abcd,
79 .ofuncs = &(struct nvkm_ofuncs) {
80 .ctor = NULL,
81 .dtor = _nvkm_gpuobj_dtor,
82 .init = _nvkm_gpuobj_init,
83 .fini = _nvkm_gpuobj_fini,
84 .rd32 = _nvkm_gpuobj_rd32,
85 .wr32 = _nvkm_gpuobj_wr32,
86 },
87 };
88
89 int
nvkm_ramht_new(struct nvkm_object * parent,struct nvkm_object * pargpu,u32 size,u32 align,struct nvkm_ramht ** pramht)90 nvkm_ramht_new(struct nvkm_object *parent, struct nvkm_object *pargpu,
91 u32 size, u32 align, struct nvkm_ramht **pramht)
92 {
93 struct nvkm_ramht *ramht;
94 int ret;
95
96 ret = nvkm_gpuobj_create(parent, parent->engine ?
97 &parent->engine->subdev.object : parent, /* <nv50 ramht */
98 &nvkm_ramht_oclass, 0, pargpu, size,
99 align, NVOBJ_FLAG_ZERO_ALLOC, &ramht);
100 *pramht = ramht;
101 if (ret)
102 return ret;
103
104 ramht->bits = order_base_2(nv_gpuobj(ramht)->size >> 3);
105 return 0;
106 }
107