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
33static u32
34nouveau_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
48int
49nouveau_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
73void
74nouveau_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
83static struct nouveau_oclass
84nouveau_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
96int
97nouveau_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