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#include <core/object.h>
25
26static u32
27nvkm_ramht_hash(struct nvkm_ramht *ramht, int chid, u32 handle)
28{
29	u32 hash = 0;
30
31	while (handle) {
32		hash ^= (handle & ((1 << ramht->bits) - 1));
33		handle >>= ramht->bits;
34	}
35
36	hash ^= chid << (ramht->bits - 4);
37	return hash;
38}
39
40struct nvkm_gpuobj *
41nvkm_ramht_search(struct nvkm_ramht *ramht, int chid, u32 handle)
42{
43	u32 co, ho;
44
45	co = ho = nvkm_ramht_hash(ramht, chid, handle);
46	do {
47		if (ramht->data[co].chid == chid) {
48			if (ramht->data[co].handle == handle)
49				return ramht->data[co].inst;
50		}
51
52		if (++co >= ramht->size)
53			co = 0;
54	} while (co != ho);
55
56	return NULL;
57}
58
59static int
60nvkm_ramht_update(struct nvkm_ramht *ramht, int co, struct nvkm_object *object,
61		  int chid, int addr, u32 handle, u32 context)
62{
63	struct nvkm_ramht_data *data = &ramht->data[co];
64	u64 inst = 0x00000040; /* just non-zero for <=g8x fifo ramht */
65	int ret;
66
67	nvkm_gpuobj_del(&data->inst);
68	data->chid = chid;
69	data->handle = handle;
70
71	if (object) {
72		ret = nvkm_object_bind(object, ramht->parent, 16, &data->inst);
73		if (ret) {
74			if (ret != -ENODEV) {
75				data->chid = -1;
76				return ret;
77			}
78			data->inst = NULL;
79		}
80
81		if (data->inst) {
82			if (ramht->device->card_type >= NV_50)
83				inst = data->inst->node->offset;
84			else
85				inst = data->inst->addr;
86		}
87
88		if (addr < 0) context |= inst << -addr;
89		else          context |= inst >>  addr;
90	}
91
92	nvkm_kmap(ramht->gpuobj);
93	nvkm_wo32(ramht->gpuobj, (co << 3) + 0, handle);
94	nvkm_wo32(ramht->gpuobj, (co << 3) + 4, context);
95	nvkm_done(ramht->gpuobj);
96	return co + 1;
97}
98
99void
100nvkm_ramht_remove(struct nvkm_ramht *ramht, int cookie)
101{
102	if (--cookie >= 0)
103		nvkm_ramht_update(ramht, cookie, NULL, -1, 0, 0, 0);
104}
105
106int
107nvkm_ramht_insert(struct nvkm_ramht *ramht, struct nvkm_object *object,
108		  int chid, int addr, u32 handle, u32 context)
109{
110	u32 co, ho;
111
112	if (nvkm_ramht_search(ramht, chid, handle))
113		return -EEXIST;
114
115	co = ho = nvkm_ramht_hash(ramht, chid, handle);
116	do {
117		if (ramht->data[co].chid < 0) {
118			return nvkm_ramht_update(ramht, co, object, chid,
119						 addr, handle, context);
120		}
121
122		if (++co >= ramht->size)
123			co = 0;
124	} while (co != ho);
125
126	return -ENOSPC;
127}
128
129void
130nvkm_ramht_del(struct nvkm_ramht **pramht)
131{
132	struct nvkm_ramht *ramht = *pramht;
133	if (ramht) {
134		nvkm_gpuobj_del(&ramht->gpuobj);
135		vfree(*pramht);
136		*pramht = NULL;
137	}
138}
139
140int
141nvkm_ramht_new(struct nvkm_device *device, u32 size, u32 align,
142	       struct nvkm_gpuobj *parent, struct nvkm_ramht **pramht)
143{
144	struct nvkm_ramht *ramht;
145	int ret, i;
146
147	if (!(ramht = *pramht = vzalloc(struct_size(ramht, data, (size >> 3)))))
148		return -ENOMEM;
149
150	ramht->device = device;
151	ramht->parent = parent;
152	ramht->size = size >> 3;
153	ramht->bits = order_base_2(ramht->size);
154	for (i = 0; i < ramht->size; i++)
155		ramht->data[i].chid = -1;
156
157	ret = nvkm_gpuobj_new(ramht->device, size, align, true,
158			      ramht->parent, &ramht->gpuobj);
159	if (ret)
160		nvkm_ramht_del(pramht);
161	return ret;
162}
163